CA1255887A - Disposable absorbent articles - Google Patents

Disposable absorbent articles

Info

Publication number
CA1255887A
CA1255887A CA000509084A CA509084A CA1255887A CA 1255887 A CA1255887 A CA 1255887A CA 000509084 A CA000509084 A CA 000509084A CA 509084 A CA509084 A CA 509084A CA 1255887 A CA1255887 A CA 1255887A
Authority
CA
Canada
Prior art keywords
acid
hydrogel
control agent
article
highly neutralized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000509084A
Other languages
French (fr)
Inventor
Ronald W. Berg
Robert L. Stewart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24951641&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA1255887(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Application granted granted Critical
Publication of CA1255887A publication Critical patent/CA1255887A/en
Expired legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42Use of materials characterised by their function or physical properties
    • A61L15/46Deodorants or malodour counteractants, e.g. to inhibit the formation of ammonia or bacteria
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F5/00Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
    • A61F5/44Devices worn by the patient for reception of urine, faeces, catamenial or other discharge; Portable urination aids; Colostomy devices
    • A61F5/4401Devices worn by the patient for reception of urine, faeces, catamenial or other discharge; Portable urination aids; Colostomy devices with absorbent pads
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/84Accessories, not otherwise provided for, for absorbent pads
    • A61F13/8405Additives, e.g. for odour, disinfectant or pH control
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51409Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a film
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/53051Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/84Accessories, not otherwise provided for, for absorbent pads
    • A61F2013/8476Accessories, not otherwise provided for, for absorbent pads with various devices or method
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2300/00Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
    • A61L2300/20Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices containing or releasing organic materials
    • A61L2300/21Acids
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2300/00Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
    • A61L2300/40Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
    • A61L2300/404Biocides, antimicrobial agents, antiseptic agents

Abstract

DISPOSABLE ABSORBENT ARTICLES
ABSTRACT OF THE DISCLOSURE
Absorbent articles containing both pH control agents and substantially water-insoluble, highly neutralized hydrogel mater-ial as a fluid-absorbing polymer are disclosed. By placing pH
control agents and hydrogel in distinct discrete zones within the article, absorbent products such as diapers can be realized which are highly effective for absorbing discharged body fluids and which also serve to prevent or reduce diaper rash.

Description

~L2 S S~3 ~

DISPOSABLE ABSORBENT ARTICLES

FIELD OF THE INVENTION
The present invention relates to disposable absorbent articles such as diapers and incontinence pads. Such articles are assembled in a manner which renders them especially effective for absorbing discharged body fluicls while at the same time preventing or reducing diaper rash.
BACKGROUND OF THE INVENTION
Diaper rash is a common form of irritation and inflamma-tion of those parts of an infant's body normally covered by a diaper. This condition is also referred to as diaper dermatitis, napkin dermatitis, napkin rash, and nappy rash. While certainly more common in infants, this condition is not, in fact, limited to infants. Any individual who suffers from incontinence may develop this condition. This ranges from newborns, to the elderly, to cri~ically ill or nonambulatory individuals.
It is generally accepted that true "diaper rash" or 2C "diaper dermatitis" is a condition which is, in its most simple stages, a contact irritant dermatitis. The irritation of simple diaper rash results from extended contact of the skin with urine, or feces, or both. Diapers are worn to catch and hold the body waste, but generally hold the waste in direct contact with the skin until changed, i.e., in occluded fashion for long periods of time. The same is true ~or an incontinence pad, or incontinence brief. However, while it is known that the body waste "causes"
diaper rash, the precise component or components of the urine or feces which are responsible for the resulting irritation of the skin have not been conclusively identified. The most commonly accepted list of factors linked to diaper rash includes ammonia, bacteria, the products of bacterial action, urine pH, Candida . _ - albicans, and moisture. These are generally cited in the art as being the most likely candidates for agents or conditions which produce or aggravat~ diaper rash.

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It has now been discovered that a primary cause of diaper rash is a particular set of conditions which arises as a result of prolonged contact of skin with mixtures of feces and urine. Activity of proteolytic and lipolytic fecal enzymes present in such a mixture is believed to be a major factor in producing skin irritation. Urine in contact with enzymes from feces can also result in production of ammonia which raises skin pH. This rise in skin pH, for example to levels of 6.0 and above, in turn increases that fecal proteolytic and lipolytic enzymatic activity which produces diaper rash. Urine itself can also con-tribute to diaper rash by adding moisture to the diaper environ-ment. Water, and particularly water in the form of urine, is especially effective at diminishing the barrier property of skin, thereby enhanci~ng the susceptibility of skin to fecal enzyme irritation. However, when skin pH is kept between about 3.0 and 5.5, the skin's barrier properties can be maintained. The forego-ing diaper rash model suggests that effective diaper rash control can be achieved by maintaining skin pH well within the acidic range to inhibit irritation-producing enzymatic activity while simultaneously maintaining the diaper environment as dry as possible.
Articles, compositions and procedures which inherently tend to lower the pH of diapered skin are known in the art. In fact, a number of prior art references teach the addition of various acidic pH control or "am~onia-absorbing" agents to diapers or to the diapered skin environment. Such references include, for ~xample, Alonso et al., U.S. Patent 4,382,919, Issued May 10, 1983; Blaney, U.S. Patent 3,964,486, Issued June 22, 1976; Bryce, U.S. Patent 3,707,148, Issued December 26, 1972; and Jones, Sr., U.S. Patent 3,794,034, Issued February 26, 1974.
Likewise, a number of prior art references describe absorbent articles which are said to be especially effective in absorbing urine and maintaining skin dryness. Frequently such articles involve the utili~ation of superabsorbent polymeric material, such as water-insoluble, slightly cross-linked hydrogel ~2~88q or hydrocolloid material, that absorbs and holds many ~imes its weight in discharged fluid. Re~erences involving the use of such superabsorbent polymers in diaper structures include, for example, Harper et al., U.S. Patent 3,669,103, Issued June 13, 1972;
Harmon, U.S. Patent 3,670,731, [ssued June 20, 1972, Masuda et al., U.S. Patent ~,076,663, Issued February 28, 1978; Melican, U.S~ Patent 4,232,674, Issued November 11, 19BO; Holtman, U.S.
Patent 4,333,463, Issued June 8, 1982; Mazurak et al., U.S. Patent 4,381,782, Issued May 3,. 1983 and Elias, U.S. Patent 4,381,783, Issued May 3, 1983.
None of the foregoing prior art references provide both especially effective skin pH control agents and especially effec-tive moisture-absorbing hydrogel polymers in the same absorbent structure. In ~act, simple combination of acidic pH control agents with superabsorbent polymer material in the same structure cannot be accomplished without some difficulty. The preferred moisture-absorbing hydrogel materials are not especially effective fluid absorbers under low pH conditions. The presence of acidic skin pH control agents, which lower pH conditions in the region of hydrogel-moisture contact, thus tends to diminish the moisture absorbing e~fectiveness of the hydrogel materials. There is therefore a need to identify preferred structures and con~ig-urations for absorbent articles which contain both effective acidic pH control agents and effective moisture-absorbing hydrogel polymers such that each of these components can efficiently contribute to the prevention or reduction of diaper rash. It has now been discovered that improved diaper rash-reducing absorbent articles containing both acidic pH control agents and moisture-absorbing, highly neutralized hydrogel can be realized by incor-porating these materials into distinct zones or areas within theabsorbent article structure.
SUMMARY OF THE INVENTION
The present invention provides an absorbent article, such as a diaper or incontinence pad, which is suitable for absorbing body fluids while at the same time reducing or ~ æ~

preventing diaper rash. Such an absorbent article comprises a liquid impervious backing sheet, a relatively hydrophobic, liquid pervious topsheet, a flexible absorbent core positioned between the backing sheet and the topsheet, and one or more pH control agents suitable for maintaining skin pH within the range of from about 3.0 to 5.5 in the presence of urine and feces.
The fle~ible absorbent core used in the structure comprises both hydrophilic fiber material and particles of substantially water-insoluble, highly neutralized hydrogel material. Such hydrogel material is considered to be highly neutralized if at least 50 of the acidic functional groups of the hydrogel material are neutralized with salt-forming cations.
The particles of the hydrogel material and the pH control agents are non-uniformly distributed in distinct discrete zones within the absorbent article.
Such separation of hydrogel and pH control agents can be accomplished, for example, by incorporating the pH
control agent with the topsheet of the article and not in the hydrogel-containing absorbent core. Alterna-tively, both pH control agent and hydrogel may be present in the absorbent core but in separate and/or distinct layers of the core or in separate zones of the core as defined by distinct sections of the core surface. By separating hydrogel material and pH control agents in this manner, skin pH control to combat diaper rash can be realized without adversely affecting the ability of the highly neutralized hydrogel material to absorb fluids and maintain requisite skin dryness.
Various aspects of the invention are as follows: -A disposable absorbent article useful for absorbing discharged body fluids while also reducing or preventing diaper rash, said absorbent article comprising (A~ a liquid impervious backing sheet;

- -, . : , ' ' ' ' . ',-' . ' ' -- :
, ' ~- ' . ' ' . : ' ' " - ' ' 4a--~2558~7 (B) a relatively hydrophobic, liquid pervious to~sheet;
(C) a flexible absorbent core positioned between said backing sheet and said topsheet, said flexible absorbent core comprising hydrophilic fiber material and particles of a substantially water-insoluble, highly neutralized hydrogel material having at least 50~ of its acidic functional groups neutralized with salt-forming cations; and (D) one or more pH control agents suitable for maintaining skin pH within the range of from about 3.0 to 5.5 in the presence of urine and feces;
said substantially water-insoluble, highly neutralized hydrogel particles and said pH control agents being non-uniformly distributed in distinct discrete zones within said absorbent article.
A disposable absorbent article useful for absorbing discharged body fluids while also preventing or reducing diaper rash, said absorbent article comprising (A) a liquid impervious backing sheet;
(B) a relatively hydrophobic, liquid pervious topsheet having incorporated therein or thereon one or more pH control agents suitable for maintaining skin pH within the range of from about 3.0 to 5.5 in the presence of urine and feces; and (C) a flexible absorbent core positioned between said backing sheet and said topsheet, said flexible absorbent core consisting essentially of hydrophilic fiber material and particles of a substantially water-insoluble, highly neutralized hydrogel material having at least 50% of its acidic functional ~" .

.
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~ ' '' . ', , :~L2SS8~37 4b-groups neutralized with salt-forming cations.
A disposable absorbent article useful for absorbing discharged body fluids while also preventing or reducing diaper rash, said absorbent article comprising (A) a liquid impervious backing sheet;
(B) a relatively hydrophobic, liquid pervious topsheet; and (C) a flexible absorbent core positioned between said backing sheet and said topsheet, said flexible absorbent core consisting essentially of i) hydrophilic fiber material;
ii) particles o f s u b s t a n t i a 1 l y water-insoluble, highly neutralized hydrogel material distributed within at least a por~ion of said hydrophilic fiber material, said highly neutralized hydrogel material having at least 50% of its acidic functional groups neutralized with salt-forming cations; and iii) one or more pH control agents suitable for maintaining skin pH
within the range of from about 3.0 to 5.5 in the presence of urine and feces;
said substantially water-insoluble, highly neutralized hydrogel particles and said pH control agents being non-uniformly distributed in distinct discrete zones within said flexible absorbent core.
A disposable absorbent article useful for absorbing discharged body fluids while also preventing or reducing diaper rash, said absorbent article comprising A

.
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. ' ' ' ' ., ' . ' '.. ' ' "

~ -4c- ~55~87 (A) a li~uid impervious backing sheet;
(B) a relatively hydrophobic, li~uid pervious topsheet; and (C) a flexible absorbent core positioned between said backing sheet and said topsheet, said core at least one distinct hydrogel-containing layer and at least one of distinct pH control agent-containing layer; wherein i) said hydrogel-containing layer consists essentially of a) hydrophilic fiber material; and b) particles of substantially water-insoluble, highly ~ -neutralized hydrogel material distributed within at least a portion of said hydrophilic fiber material, said highly neutralized hydrogel material having at least 50% of its acidic functional groups neutralized with salt-forming cations; and ii) said pH control agent-containing layer consists essentially of a) h y droph il ic fib er material; and b) one or more pH control agents suitable for maintaining skin pH
wi~hin the range of from about 3.0 to 5.5 in the presence of urine and feces.
A disposable absorbent article useful for absorbing discharged body fluids while also preventing or reducing diaper rash, said absorbent article comprising ~ .

: ~ . . , , .: ' ' -- . - . :
, :, :
: ~ . , : - ', . . . .
, -~id- ~5S~7 (A) a liquid impervious backing sheet;
(B) a relatively hydrophobic, liquid pervious topsheet; and (C) a flexible absorbent core comprising i) hydrophilic fiber material;
ii) substantially water-insoluble, highly neutralized hydrogel material having at least 50% of its acidic functional groups neutralized with salt-forming cations; and iii) one or more pH control agents, suitable for maintaining skin pH
within the range of from about 3.0 to 5.5 in the presence of urine and feces;
said highly neutralized hydrogel material and said pH control agent being non-uniformly distributed in distinct discrete zones of said core, said zones being defined by partitioning the flat surface of said absorbent core into at least one area of relatively high hydrogel concentration and at least one area of relatively high pH control agent concentration.
BRIEF_DESCRIPTION OF THE DRAWINGS
Figure 1 represents a cut-away view of a diaper structure having acidic pH control agent carried by the topsheet.
Figure 2 represents a cut-away view of a diaper structure having a dual-layer absorbent core comprising both an upper layer containing acid pH
control agent and a separate lower insert layer containing hydrogel particles.

A

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~ 255l~7 Figure 3 represents a cut-away view of a diaper structure having its absorbent core partitioned into distinct sections containing, respectively, hydrogel and acid pH control agent.
DE~AILED DESCRIPTION OF THE INVENTION
The absorbent articles of the present invention can be manufactured in the configuration of wearable disposable products which are capable of absorbing significant quantities of water and body waste fluids such as urine and fecesO Thus such articles, for example, may be prepared in the form of disposable diapers, adult incontinence pads and the like.
The absorbent articles herein generally comprise three basic structural components. One such component is a liquid impervious backing sheet. On top o~ this backing sheet is placed an absorbent core which may itself comprise one or more distinct layers. On top of this absorbent core is placed a relatively hydrophobic, liquid previous topsheet. The topsheet is the element of the article which is placed next to the skin of the wearer.
Especially preferred absorbent articles of this invantion are disposable diapers. Articles in the form of disposable diapers are fully described in Duncan and 25 Baker, U.S. Patent Re 26,151, Issued January 31, 1967;
Duncan, U.S. Patent 3,592,194, Issued July 13, 1971;
Duncan and Gellert, U.S. Patent 3,489,148, Issued January 13, 1970: and Buell, U.S. Patent 3,860,003, Issued January 14, 1975. A preferred disposable diaper for the purpose of this invention comprises an absorbent core; a topsheet superposed or co-extensive with one face of the core, and a liquid impervious backsheet superposed or co-extensive with the face of the core opposite the face covered by the topsheet. The backsheet most preferably has a width greater than that of the core thereby providing side marginal portions of r"~

, : ~ ,: ' - ' ' ' ' ' : ':
- - . : , :" . ' - ,~ , . ' , , ~ll2S~ 8 ~7 the backsheet which extend beyond the core. The diaper is preferably constructed in an hourglass configuration.
The backsheet of the ~rticles herein can be constructed, for example, from a thin, plastic film of polyethylene, polypropylene, or other flexible moisture impeding material which is substantially water impervious. Polyethylene, having an embossed caliper of approximately 1.5 mils, is especially preferred.
The topsheet of the article herein can be made in part or completely of synthetic fibers such as polyester, polyolefin, rayon, or the like, or of natural fibers such as cotton. The fibers are typically bound together by a thermal binding procedure or by a polymeric binder such as polyacrylate. This sheet is substantially porous and permits a fluid to readily pass therethrough into the underlying absorptive core. The topsheet can be made more or less hydrophobic depending upon the choice and treatment of fiber and binder used in the construction thereof. The topsheets used in the articles of the present invention are relatively hydrophobic in comparison with the absorbent core of said articles. Topsheet construction is generally disclosed in Davidson, U.S. Patent 2,905,176, Issued September 22, 1959; Del Guercio, U.S. Patent 3,063,452, Issued November 13, 1962; and ~olliday, U.S. Patent 3,113,570, Issued December 10, 1963. Preferred topsheets are constructed from polyester, rayon, rayon/polyester blends or polypropylene.
An absorbent core, which may itself comprise one or more separate and/or distinct zones, e.g., layers, is positioned between the backing sheet and the topsheet to form the absorbent articles herein. Such an absorbent core comprises, at least in part, a mixture of hydrophilic fiber material and particles of substantially water-insoluble, highly neutralized hydrogel material. This mixture will generally be in r~

, .. . .
.
- : : :
~ ~ ' ~L~255887 ths form of a web of` the hydrophilic fibers with the discrete particles of hydrogel dispersed therein.
The type of hydrophilic fibers is not critical for use in the present invention. Any type of hydrophilic fiber which is suitable for usle in conventional absorbent products is also suitable for use in the absorbent structure of the present invention. Specific examples of such fibers includle cellulose fibers, rayon, polyester fibers. Other examples of suitable hydrophilic fibers are hydrophilized hydrophobic fibers, such as surfactant-treated or silica-treated thermoplastic fibers. Also, fibers which do not provide webs of sufficient absorbent capacity to be useful in conventional absorbent structures, but which do provide good wicking properties, are suitable for use in the absorbent structures of the present invention. This is so because, in the presence of hydrogel particles, wicking properties of the fibers are far more important than their absorbent capacity. For reasons of availability and cost, cellulose fibers, in particular wood pulp ~ibers, are preferred.
As indicated, absorbent cores formed from such hydrophilic fibers also contain discrete particles of substantially water-insoluble, highly neutralized hydrogel material. Such highly neu~ralized hydrogel materials are those organic compounds capable of absorbing aqueous fluids and retaining them under moderate pressures. For good results, the hydrogels must be substantially water insoluble.
Examples of such hydrogels include material in the form of cross-linked polymersO Cross-linking may be by covalent, ionic, vander Waals, or hydro~en bonding.
Examples of hydrogel polymers include ethylene maleic anhydride copolymers, carboxymethylcellulose, polymers and copolymers o~ vinyl sulfonic acid, polyacrylates, and the like. Other suitable hydrogsls are those ~.

.. - ~ , ', ' ,:
, . ' :.
, - ~

- ' :

~2558~7 ~ B
disclosed in Assarsson et al., U.S. Patent 3,901,236, Issued Au~ust 26, 1975. Particularly preferred polymers foP-~~se herein are acrylic acid grafted starch, polyacrylates, and isobutylena maleic anhydride copolymers, or mixtures thereof.
Processes for preparing hydrogels are disclosed in Fusayoshi Masuda et al., U.S. Patent 4,076,663, Issued February 28, 1978; in Tsuno Tsubakimoto et al., U.S.
Patent 4,286,082, Issued August 25, 1981; and further in U.S. Patents 3,734,876, 3,661,815, 3,670,731, 3,664,343, 3,783,871, and Belgian Patent 785,858.
The hydro~el materials used in the present invsntion are highly neutralized hydrogels and therefore must be hydrogels which contain neutralizable, acidic functional groups. Thus these hydrogels must be polymers prepared from at least some monomers containing at least one carboxylic acid, carboxylic acid anhydride or sulfonic acid group. Generally at least 10 mole percent and more prefarably at least 50 mole percent of the hydrogel structure will be prepared ~rom such acid group-containing monomers.
The hydrogel material essentially used in the absorbent core of the articles herein is highly neutralized, i.e. at least 50%, and preferably at least 65% of the hydrogel ~cidic functional groups must be neutralized with a salt-forming cation. Suitable salt-for~ing cations include alkali metal, ammonium, substituted ammonium and ami~es. Neutralization can be carried out either before or after polymerization of the acid group~containing hydrogel material has occurred.
Neutralization can be accomplished in known manner using conventional techniques. It should be understood that the hydrogel material employed in the present invention must be neutralized to the extent of at least 50% prior to contact of the hydrogel matPrial with body fluids such as urine.

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.. :' .. ~ :' ~;255~3 !37 8a Hydrogel material is used in the form of discrete particles in the absorbent core of the absorbent arti-cles herein. Such particles can be of any desired shape, e.g., spherical or semi-spherical, cubic, rod-like, polyhedral, etc. Shapes having a large greatest dimension/smallest dimension ratio, like needles, flakes and fibers, are also contemplated for use herein. Conglomerates of hydrogel particles may also be used.
Although the absorbent cores of the present invention are expected to perform well with hydrogel particles having a particle size varying over a wide range, other considerations may preclude the use of very small or very large particles. For . ~
~ .~, '~

' ~ ' - ' ' ~255887 reasons of industrial hygiene, (weight) average particle sizes smaller than about 30 microns are less desirable. Particles having a smallest dimension larger than about 3 mm may also cause a feellng of grittiness in the absorbent structure, which is undesirable from a consumer aesthetics standpoint. Preferred for use herein are particles having an (weight) average particle size of from about 50 microns to about lmm. "Particle Size" as used herein means the weight average of the smallest dimension of the individual particles..
10The rela~ive amount of hydrophilic fibers and hydrogel particles used in the highly neutralized hydrogel-containing portion of the cores of the absorbent articles herein can be mo~t conveniently expressed as a weight ratio of fiber to hydrogel.
These ratios may range from about 30:70 to about 98:2. Low 15fiber/hydrogel ratios, i.e., from about 30:70 to about 50:50, are practicable only when the hydrogel used possesses a low swelling capacity i.e., hydrogels having an absorbent capacity for urine and other body fluids of less than about 15 times their own weight (15X). (Absorbent capacity data are generally available from the manufacturer of the hydrogel or may conveniently be determined by known means.) Hydrogels which have a very high absorption capaci-ty (e.g., 25X, and which consequently exhibit a high degree of swelling after wetting) tend to gel block when used in absorbent structure cores at low fiberlhydrogel ratios. This phenomenon causes undesirable, slow, diffusion type absorption kinetics.
Very high fiber/hydrogel ratios, e.g. above 95:5, on the other hand, provide meaningful per~ormance benefits only if the hydrogel used has a high absorbent capacity (e.g., 25X for urine and other body fluids). For most commercially available hydrogels the optimum fiber/hydrogel ratio is in the range of from about 50:50 to about 95:5.
Based on a cost/performance analysis, fiber/hydrogel ratios o~ from about 75:25 to about 90:10 are preferred. This preference is, of course, based on the relative costs of hydro-philic fibers (e.g. wood pulp fibers) and hydrogel. If, for :

~255~387 ,~ 10 example, wood pulp prices would go up and/or hydrogelprices would come down, lower fiber/hydrogel ratios would be more cost effective.
The density of the hydrogel-containing portion of the absorbent structure core i~ of some importance in determining the absorbent properties of the resulting absorbent structure. When hydrogel particles are dispersed into an absorbent web of hydrophilic fibers having a density of about 0.1 ~/cm3, the admixture of the hydrogel results in only a small increase in the amount of fluid which is absorbed within a practicably reasonable time (e.g. 10 minutes) because the fluid uptake of such webs is slow. When the hydrogel-containing absorbent core is densified to a density of at least about 0.12 g/cm3, a marked increase in absorbent capacity is observed. It is believed that densifying the web results in better wicking of fluid into the web, so that more hydrogel particles participate in the absorption process, which results in a higher actual absorbent capacity. It is further believed that a densified web may be more effective in keeping the hydrogel particles isolated from each other.
Densifying the web further, from about 0.15 g/cm3 to about l g/cm3, results in a reduction in the bulk of the structure (which is desirable from a consumer standpoint, for aesthetics reasons), without loss of absorbent capacity. However, above a density of about 0.6 g/cm3, further densification hardly reduces the bulk further, because of the inverse relationship between bulk and density. The density of the portion of the absorbent core containing highly neutralized hydrogel particles is therefore preferably in the range of from about 0.10 to about 0.6 g/cm3, and more preferably within the range of from about 0.12 to about 0.25 g/cm3.
The portion of the absorbent core which contains the highly neutralized hydrogel can be formed by ~ ".~

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1~255887 `
lOa airlaying a dry mixture of hydrophilic fibers and hydrogel particles. Such a procedure is described more fully in Procter & Gamble; European Patent Publication No. EP-A-122042; Published October 17, 1984. As indicated in this reference, :'' , .

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the webs formed by this procedure for use in the articles herein will preferably comprise substantially unbonded fiber and will preferably have a moisture content of 10% or less.
As noted hereinbefore, the web formed from a mixture of hydrophilic fibers and the highly neutralized hydrogel particles need form only a portion of the total absorbent core used in the absorbent articles of this invention. Other sections or zones of the absorbent core can contain no hydrogel particles and may comprise only hydrophilic fibers or may comprise pH control agents, with or without hydrophilic fibers, as hereinafter more fully described. Such distinct core sections can comprise sepa-rate and/or distinct layers within the absorbent core or can comprise separate and/or distinct areas or zones within the same layer.
In a preferred diaper embodiment of the present in-vention, the absorbent core with all its distinct sections taken together, will be hourglass shaped, i.e., the width of the center of the core is substantially less than the width of the core at the ends. In a preferred diaper embodiment, the absorbent core with all its distinct sections and layers will have a total ` thickness within the range of from about 5mm to 20mm, more pref-erably from about 7mm to 12mm.
Another essential feature of the present invention is the presence in the absorbent articles herein of one or more pH
control agents. Such agents are non-uniformly distributed within the absorbent article and are placed in discrete zones within the article. These zones containing pH control agent are substantial-ly distinct from the zones wherein the highly neutralized hydrogel particles are placed.
The useful pH control agents are those which maintain skin pH within the range of from about 3.0 to 5.5, and preferably from about 3.5 to 4.5 in the presence of urine and feces. Pref-erably skin pH is maintained within this range for the length of time the diaper is worn, e.g., for at least 4 hours for daytime ~255~38~

infant diapers and for at least 8 hours for nighttime infant diapers.
A wide variety of non-toxic, non-;rritating acidic materials which release protons can serve as skin pH control agents. Thus these materials can be low molecular weight organic or inorganic acids, high molecular weight polymeric acids or ion exchange resins and fibers in the hydrogen form.
Suitable low molecular weight organic and inorganic acid materials include such weak acids as citric acid, adipic acid, azelaic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, levulenic acid, glycolic acid, succinic acid, fumaric acid, pimelic acid, suberic acid, sebacic acid and acid phosphate salts.
These low molecular weight materials may be used in combination with their conjugate bases to provide buffer capacity. Some of these acid materials, such as adipic acid, possess inherent buffering capacity as a result of their relative limited water solubility.
Suitable high molecular weight polymeric acids include polyacrylic acid and its polyacrylate derivatives, poly(maleic acid) and its polymaleate derivatives, alginic acid, carboxy-methylcellulose and the like. Polyacrylic acid and its poly-acrylate derivatives useful as pH control agents may be cross-linked sr uncross-linked and may range in molecular weight from l,000 to 5,000,000. Such acrylic acid-based materials include, for example, the Carbopol resins which are water-soluble polymers of acrylic ac~id cross-linked with such materials as polyallyl sucrose and polyallyl pentaerythritol. Poly(maleic acid) and its polymaleate derivatives useful as pH control agents may also be cross-linked or uncross-linked and may range in molecular weight from 1,000 to 5,000,000. Poly~maleic acid) derivatives include poly(vinyl ether-maleic acid), and poly(methyl vinyl ether-maleic acid) such as the Gantrez resins and poly (styrene-maleic acid) materials.
All of the foregoing higher molecular weight polymeric materials, unlike the highly neutrali~ed hydrogel absorbent ~25~88'7 polymers used in the present invention, must be less than 50%
neutralized and thus predominately in the free acid form to be effective as pH control agents in the absorbent articles herein.
One preferred type of pH control agent co~prises poly-acrylic acid and polyacrylic acid derivatives. These preferredpolyacrylic acid derivatives can include the same type of starch-grafted polyacrylic acid or polyacrylate materials as the highly neutralized hydrogel materials used as absorbents in the present invention. Such acidifi.ed hydrogel materials indeed do possess some degree of fluid absorbin~g capacity in addition to their capacity to lower skin pH. It should be noted, however, that when materials of this type are used as pH control agents in the absorbent articles herein, they must be less than 50% neutralized.
Thus, in the context of the present invention, such acidified hydrogels must always be used in combination with the more absor-bent, more fully neutralized hydrogels hereinbefore described as the essential fluid-absorbing hydrogel element of the articles herein.
Another preferred type of pH control agent comprises ion exchanging, modified cellulose materials in fiber form. This includes, for example, carboxymethylcellulose in the free acid form, oxidized cellulose, sulfoethyl cellulose and phosphorylated cellulose ("cellulose phosphate") prepared by conventional tech-niques. Phosphorylated cellulose, for example~ can be prepared by trea~ing cellulose with solutions of urea and phosphoric acid, with phosphorus oxychloride and pyridine, with phosphorus oxy-chloride and phosphoric acid, with phosphorus oxychloride and dioxane or with phosphorus oxychloride alone. Examples of methods for preparing phosphorylated cellulose ion-exchanging fibers are 30 described in Bernardin, U.S. Patent 3,691,154, Issued September 12, 1972, and Bernardin, U.S. Patent 3,658,790, Issued April 25, 1972. Methods for preparing other types of ion-exchanging cellu-lose derivatives are described in Sano et al., U.S. Patent 4,200,735, Issued April 29, 1980, Ward et al., U.S. Patent 35 3,854,868, Issued December 17, 1974 and Bridgeford, U.S. Patent , !

1 2 5 ~;~3~3 3,533,725, Issued October 13, 1970.
Modified cellulose ion-exchanging fibers for use in their hydrogen form as pH control agents in the present invention preferably have an ion-exchange capacity of at least about 0.4 meq./gram, more preferably at least about 1.0 meq./gram. Cellu-lose-derived pH control agents are especially advantageous for incorporation into the absorbent core of the articles herein since such acidic ion-e~changing fibers can easily be admixed with the hydrophilic fibers essentially present in the absorbent core.
The pH control agents of whatever type used in the absorbent articles of the present invention will generally com-prise from about 1~ to 30% by weight of the total absorbent article. More preferably, such agents can comprise from about 5X
to 15~ by weight of the article.
It has been discovered that the moisture-absorbing hydrogel material and the acidic skin pH control agents hereinbe-fore described can be successfully and usefully incorporated into the same absorbent article provided such hydrogel particles and pH
control agents are non-uniformly distributed in distinct discrete zones within the absorbent article. For purposes of the present invention, highly neutralized hydrogel and pH control agents are deemed to be non-uniformly distributed in the absorbent article when there is a) at least one zone (and generally no more than ten zones) within the article wherein the weight ratio of hydrogel to pH cnntrol agent is at least about 10:1, and b) at least one zone (and generally no more than ten zones) within the article wherein the weight ratio of pH control agent to hydrogel is at least about 10:1.
Such non-uniform distribution of the highly neutralized hydrogel and pH control agent can be accomplished in a number of ways. In one embodiment, the p~ control agent is distributed in or on the topsheet of the absorbent article with little or no pH
control agent being placed in the hydrogel-containing absorbent Icore of the article. An article of this type is described in r~ .
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` , :,, ~L255~8 Figure 1 of the drawings submitted herewith. This hourglass-shaped diaper structure comprises a liquid impervious backing sheet 101 and a hydrophobic topsheet 102. Positioned between the backing sheet and topsheet is an hourglass-shaped absorbent core 103 containing hydrophilic fiber material such as wood pulp fiber.
Also distributed throughout the absorbent core 103 are discrete particles 104 of substantially water-insoluble, highly neutralized hydrogel material. Acid pH control agent 105 suitable for main-taining skin pH between 3.0 and 5.5 is coated on or impregnated in the topsheet 102 and is thus maintained in a distinct zone from the hydrogel particles 104 in the diaper core.
In another embodiment, both highly neutralized hydrogel and pH control agent may be placed in the absorbent core but in distinct discrete zones within the core. Such separation, for example, may be effected by placing hydrogel and pH control agent in different layers of ~he core. Thus one layer of the core, preferably the top layer, can comprise hydrophilic fiber material and pH control agent in a weight ratio of fiber to agent of from about 10:1 to 1:1, with substantially no highly neutralized absorbent hydrogel present. Another layer of the core, preferably the bottom layer, can comprise hydrophilic fiber and highly neutrali~ed hydrogel material in a weight ratio of fiber to highly neutralized hydrogel of from about 10:1 to 1:1, with substantially no pH control agent present.
A diaper article with such a layered core is depicted in Figure 2 of the drawings submitted herewith. This hourglass-shaped diaper structure also comprises a liquid impervi-ous backing sheet 201 and a hydrophobic topsheet 202. The absor-bent core of the structure comprises two distinct layers, i.e., an upper, hourglass-shaped layer 203 and a lower, oval insert layer 204. The upper layer 203 contains pH control agent 205 admixed therewith. The lower oval insert layer 204 contains discrete particles 206 of substantially water-insoluble, highly neutralized hydrogel distributed throughout this lower oval insert layer.

~,2~5~387 In yet another embodiment, the absorbent core of the article may comprise three distinct layers with one layer, pref-erably the top, consisting essentially of hydrophilic fiber plus pH control agent, another layer, preferably the bottom, consisting essentially of hydrophilic fiber plus highly neutralized hydrogel and a third layer, preferably positioned between the other two layers, consisting essentially of hydrophilic fibers only.
In yet another embodiment, the discrete zones con-taining, respectively, pH control agent and highly neutralized hydrogel material, may comprise different portions of the absor-bent article or core thereof as defined by partitioning the flat surface of the article or core into at least one area of relative-ly high hydrogel concentration and at least one area of relatively high pH control agent concentration. For example9 the front 15` two-thirds section of the absorbent article, as viewed unfolded from the top, may contain substantially all of the highly neu--tralized hydrogel material whereas the back or rear one-third section of the article may contain substantially all of the pH
control agent. Size and shape of the discrete zones of high pH
control agent concentration and high hydrogel concentration can, of course, vary according to the intended use and size require-ments of the absorbent article desired.
A diaper article with hydrogel and pH control agent in separate sections of the same absorbent core layer is depicted in Figure 3 of the drawings submitted herewith. This hourglass-shaped structure also comprises a liquid impervious backing sheet 301 and a hydrophobic topsheet 302. A hydrophilic fiber-con-taining absorbent core 303 is positioned between the backing sheet 301 and topsheet 302. The absorbent core 303 in this embodiment comprises a hydrogel-containing zone 304 consisting of the front two-thirds of the absorbent core 303 and a pH control agent-containing zone 305 consisting of the back one-third of the absorbent core 303. Discrete particles 306 of substantially water-insoluble, highly neutralized hydrogel are distributed throughout the hydrosel-containing zone 30~. Acidic pH control iS8l~7 agent 307 is distributed throughout the pH control agent containing zone 305.
The absorbent articles of the present invention, with their distinct zones containing pH control agent and hydrogel material, are further illustrated by the following examples:
EX~MPLE I
A disposable diaper product containing both a Gellulose phosphate pH control agent and particles of a starch-acrylate hydrogel material is prepared. Such an article comprises an absorbent core positioned betwPen a polyethylene backing sheet and a hydrophobic, liquid pervious non-woven rayon topsheet. The absorbent core comprises two layers, one of which is an hour-glass-shaped primary core and the other of which is a smaller oval insert placed beneath the primary core.
The hourglass consists of a homogeneous blend of southern soft wood/pine fibers and ~ibrous phosphorylated cellulose ("cellulose phosphate") having an ion exchange capacity of about 3.5 meq./gram. The oval insert consists of a homogeneous blend of southern soft wood/pine fibers and particles (250 microns) of acrylic acid graf~ed starch hydrogel ("Sanwet IM-lOOO"TM
from Sanyo Co. Ltd., Japan). The absorbent core with its two layers is overwrapped with tissue paper.
A more detailed description of such a disposable diaper product is set forth in Example III hereinafter.
Substantially similar disposable diapers can be prepared by replacing the cellulose phosphate pH control agent with an equivalent amount of an acid phosphate salt or with a low molecular weight organic acid such as citric acid, adipic acid, azelaic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, levulenic acid, glycolic acicl, succinic asid, fumaric acid, pimelic acid, suberic acid, or sebacic acid.

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~L~2S58137 EXAMPLE II
A disposable diaper product containing both an acidified polyacrylate pH control agent and a starch acrylate hydrogel material is prepared. As in Example I, such an article comprises an absorbent core positioned between a polyethylene backing sheet and a hydrophobic, non-woven rayon topsheet. The absorbent core comprise~ two layers, one of which is an hourglass-shaped primary core and the other of which is a smaller oval insert plac~d beneath the primary core.
The hourglass consists of a homogeneous blend of southern soft wood/pine fibers and particles (300 microns avg.) of a slightly cross-linked, completely unneutralized poly(acrylic acid) hydrogel material.
(Aqualic 4R04KITM from Nippon Shokubai K.K. Co., Ltd., Japan~. The oval insert consists of a homogeneous blend of southern soft wood/pine fibers and particles (250 microns) of acrylic acid grafted starch hydrogel ("Sanwet IM-lOOO"TM from Sanyo Co. Ltd., Japan). The absorbent core with its two layers is overwrapped with tlssue paper.
A more detailed description of such a disposable diaper product is set forth in Example IV hereinafter.
EXAMPL~ III
Leakage and skin pH measurement studies were conducted to determine the ability of diapers containing pH control agents and hydrogel absorbents to lower skin pH and to absorb discharged body fluid. In such testing, performance of the cellulose phosphate containing diaper of Example I was compared with that of (l) a similar product containing no cellulose phosphate in the hourglass core and (2) a commercially available diaper product containing a 100% wood pulp fiber core with no pH control agent or hydrogel material. These ~5 diaper products are more fully described in Table I
hereinafter.

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TABLE I
Control Diapers Hydrogel No Example I Diaper Only Hydrogel Core Composition (%) 11/76/13 CP/CF/San84/16 CF/San 100 CF
Hourglass (%) 20/80 CP/CF 84/16 CF/San 100CF
Insert (%) 71/29 CF/San NA NA
Total Product Weight(gms) 48.9 42.5 52~5 Absorb.Core w/Tissue(gms) 34.9 33.2 43.6 10Absorb.Core w/o Tissue(gms) 32.6 30.9 39.1 Hourglass (gms~ 17.9 NA NA
Insert (gms) 14.7 NA NA
Core Dimensions Hourglass: Length (cm) 38.1 38.1 38.1 Width (cm)21.6 21.6 26.7 Crotch (cm) 13.3 12.7 17.1 Area (cm2)602.6 602.6 NA
Insert Length (cm)25.4 NA NA
Width (cm) 13.3 NA NA
Core Shape Oval NA NA
Area (cm2) 299.4 NA NA
Basis Weight:
Hourglass (gm/cm ) 0.049 0.051 NA
Insert (gm/cm2) 0.030 NA NA
25 Density:
Hourglass (gm/cm3) 0.150 0.132 0.100 Insert (gm/cm3~ 0.180 NA NA
CP = Cellulose phosphate CF ~ Cellulose fiber San = Sanwet lM-1000 Starch acrylate hydrogel (about 75% neu-tra1ized) NA = Not Applicable or Not Available In the leakage and skln pH measurement testing, diapers are worn by normal infants. The infants are allowed to play in a nursery school setting during the test. The diapers are left on ~55~87 the infants until leakage occurs. In order to speed up the test, aliquots of synthetic urine are added at predetermined intervals.
In the particular test of this example, 25 infants were initially impanelled and divided into three groups, with approxi-mately 1/3 being tested with one of three tes~ diapers on each ofthree consecutive days. In this manner, at the end of the test, each infant had been exposed to each diaper one time. On the last day of the study, panelists' skin pHs (undiapered and diapered) were obtained after f.ailure of the leakage test diaper was achieved Results of the leakage test and subsequent skin pH
measurements taken as part of the post-leakage skin pH study are set forth in Table II.
TABLE II
Hydrogel No Example I Diaper Only Hydrogel Leakage Test Results Total Amount of Fluid Added to 20Diaper at Failure (ml average) 264.1 234.3 185.2 Post Leakage Skin pH Study Number of Panelists 7 5 7 Undiapered Skin pH (avg)4.86 4.96 4.90 25 Standard Deviation 0.17 0.19 0.53 Diapered Skin pH (avg) 4.29 5.88 5.47 Standard Deviation 0.54 0.43 0.38 pH Change* (avg) -0.56 0.92 0.57 Standarp ~evlation 0.50 0.35 0.48 * pH Change = Diapered Skin pH - Undiapered Skin pH
The Table II leakage test data indicate that the fluid-holding capacity of the Example I diaper is not compromised by the acidic pH buffering capacity provided by the cellulose phosphate pH control agent in the hourglass core. This is surprising since laboratory data would indicate that about 15% less absorbent capacity is provided by the Sanwet hydrogel material in an acidic ~l2S~38~7 environment. The post-leakage skin pH data in Table II also demonstrate that a skin pH increase occurs with the control diapers containing no pH control agent whereas the Example I
diaper produced a statistically significant decrease in skin pH.
This suggests that the acidic diapers are able to deliver a low pH
benefit to skin when sufficient moisture is available to allow intPraction between the diaper core and the skin.
EXAMPLE IV
Usiny the po~yacrylate-containing diaper of Example II, leakage and pH measurement studies were conducted in the same general manner as described in Example III. Products tested included (1) the Example II diaper, (2) a similar product contain-ing no acidic polyacrylate in the hourglass core, and (3) a commercially available diaper product containing a 100% wood pulp fiber core with no pH control agent or hydrogel material. These diaper products are described in greater detail in Table III.

~-~25S~387 TABLE III
Control Diaper Hydrogel No .Example II Diaper Only _ Hydro~el Core Composition Hourglass (%) 55.4 55.4 100 Insert (%) 44.6 44.6 Hourglass Length (cm) 38.1 38,1 38.1 Width (cm) 21.6 21.6 26.7 Area (cm2) 602.6 602.6 NA
Density (g/cms) 00150 0.150 0.100 Total Weight (gms)18~30 18.30 43.6 Wood Pulp Fiber (gms) 14.70 15.00 NA
Acidified Polyacrylate* (gms) 4.00 Acidified Polyacrylate* (~)21.9 0.0 0.0 Starch Acrylate Hydrogel** (gms) - 2.75 Starch Acrylate Hydrogel** (%) 0.0 15.0 0.0 Insert Length (cm) 25.4 25.4 NA
Width (cm) 13.3 13.3 NA
Area (cm2) 299.3 299.3 NA
Density (g/cm3) 0.18 0.18 NA
: Total Weight (gms) 14.7 14.7 NA
Wood Pulp Fiber (gms) 10.7 12.5 NA
: Starch Acrylate Hydrogel** (gms) 4.02.2 NA
, Starch Acrylate Hydrogel** (h) 27.215.0 NA
Total Core Core Weight (gms) 33.0 33.0 39.1 Tissue (gms) 2.3 2.3 4.5 Leakage and skin pH study test results for the Table III
diapers are set forth in Table IY.
* Aqualic 4R04K1 from Nippon Shokubai K.K. Co., Ltd.
** Sanwet IM-1000 from Sanyo Co. Ltd.

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~255~38 TABLE IV
No Example II Diaper Hydrogel Leaka~e Test Results Total Amount of Fluid Added 246 204 to Diaper at Failure (mls.avg.) Post Leakage Skin pH Study Number of Panelists 8 9 Undiapered Skin pH ~avg.)4.75+0.24 4.77+0.36 Diapered Skin pH (avg.)3.80+0.89 5.44+0.68 pH change* (avg.) -0.95+0 78 ~0.68+0.67 * pH change = Diapered skin pH - Undiapered skin pH
The Table IY data also demonstrate that the acidic diaper performed about as well as the non-acid, starch acrylate hydrogel-containing diaper with respect to fluid absorption capacity. The skin pH measurements again demonstrate the impact of the acid core in lowering skin pH in the presence of discharged body fluids.
EXAMPLE V
To demonstrate the necessity of maintaining pH control agent and fluid-absorbing hydrogel in distinct zones within the diaper, pH measurements are made on diapers with double layer cores containing various amounts of pH control agent and highly neutralized hydrogel. In this study, circular 6.2 cm diameter patches of diapers are prepared with two-layered cores, each of which layers is 3 mm thick and each of which layers comprises 80%
wood pulp fiber and 20% of either a highly neutralized poly-acrylate hydrogel absorbent, an acidified polyacrylate hydrogel pH
control agent or a mixture of these two types of hydrogels. These patches are soaked in four times their weight of a mixture syn-thetic urine, salts, urea and urease to simulate the used diaper environment. The pH average of five locations on the patches are measured as a function of time. Results are set forth in Table ~.

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~ZSS~3~37 TABLE V
pH (avg.) Sample 0 1 2 No. ~ r~ oosition Hour Hour Hours 1 Top = 20~ Aquallc* ~~ ~7~ 8.0 Bottom = 20h Aqualic
2 Top = 10% Aqualic/lOX Acid Aqualic** 5.2 6.9 7.0 Bottom = 10% Aqualic/10% Acid Aqualic
3 Top = 20~ Acid Aqualic 4.0 4.6 4.3 Bottom = 20% Aqualic * Aqualic is a slightly cross-linked polyacrylate neutralized to the extent of about 75% and is marketed under the tradename Aqualic 4R04K1 by Nippon Shokubai K.K. Co. Ltd., Japan.
** Acid Aqualic is a slightly cross-linked, poly(acrylic acid) prepared by acidifying the polyacrylate material marketed under the tradename Aqualic 4R04K1 by Nippon Shokubai K.K. Co. Ltd., Japan.
The Table V data clearly show the effect of separating pH control agent and absorbent hydrogel in the diaper core. In Sample 1, the two layers of the diaper core are identical and contain no pH control agent. Diaper pH rises in the presence of the synthetic urine, urea and urease. In Sample 2, the two layers of the diaper core are also identical, each containing a homoge-neous mixture of highly neutralized absorbing hydrogel and acid-ified hydrogel pH control agent. Although diaper pH is maintainedat a lower level by this acid-containing diaper core, a signifi-~cant pH rise is still observed. In Sample ~, the acidic hydrogel pH control agent and the highly neutralized fluid-absorbing hydrogel are kept in separate layers of the diaper core. This configuration serves to maintain diaper pH at significantly lower levels than do the configurations or Samples 1 and 2.

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Claims (27)

WHAT IS CLAIMED IS:
1. A disposable absorbent article useful for absorbing discharged body fluids while also reducing or preventing diaper rash, said absorbent article comprising (A) a liquid impervious backing sheet;
(B) a relatively hydrophobic, liquid pervious topsheet;
(C) a flexible absorbent core positioned between said- backing sheet and said topsheet, said flexible absorbent core comprising hydrophilic fiber material and particles of a substantial-ly water-insoluble, highly neutralized hydro-gel material having at least 50% of its acidic functional groups neutralized with salt-form-ing cations; and (D) one or more pH control agents suitable for maintaining skin pH within the range of from about 3.0 to 5.5 in the presence of urine and feces;
said substantially water-insoluble, highly neutralized hydrogel particles and said pH control agents being non-uniformly dis-tributed in distinct discrete zones within said absorbent article.
2. An article according to Claim 1 wherein (A) said substantially water-insoluble, highly neutralized hydrogel material is selected from acrylic acid grafted starch, polyacrylates, isobutylene maleic anhydride copolymers, and mixtures of these hydrogel materials; and (B) said pH control agents are selected from non-toxic, non-irritating low molecular weight organic and inorganic acids; non-toxic, non-irritating high molecular weight polymeric acids and ion exchange resins and fibers in the hydrogen form.
3. An article according to Claim 2 wherein (A) the weight ratio of fiber to highly neu-tralized hydrogel in the absorbent core ranges from about 50:50 to 95:5;
(B) the weight average particle size of the highly neutralized hydrogel material in said absor-bent core ranges from about 50 microns to 1mm;
and (C) the pH control agent component comprises from about 1% to 30% by weight of said absorbent article.
4. An article according to Claim 3 wherein said pH
control agent is selected from citric acid, adipic acid, azelaic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, levulenic acid, glycolic acid, succinic acid, fumaric acid, pimelic acid, suberic acid, sebacic acid, and acid phosphate salts, carboxymethylcellulose, oxidized cellulose, sulfoethyl, cellulose and phosphorylated cellulose.
5. An article according to Claim 3 wherein said pH
control agent is selected from polyacrylic acid and its poly-acrylate derivatives and poly(maleic acid) and its polymaleate derivatives.
6. An article according to Claim 3 wherein said pH
control agent is an ion-exchanging modified cellulose material in fiber form.
7. A disposable absorbent article useful for absorbing discharged body fluids while also preventing or reducing diaper rash, said absorbent article comprising (A) a liquid impervious backing sheet;
(B) a relatively hydrophobic, liquid pervious topsheet having incorporated therein or thereon one or more pH control agents suitable for maintaining skin pH within the range of from about 3.0 to 5.5 in the presence of urine and feces; and (C) a flexible absorbent core positioned between said backing sheet and said topsheet, said flexible absorbent core consisting essentially of hydrophilic fiber material and particles of a substantially water-insoluble, highly neutralized hydrogel material having at least 50% of its acidic functional groups neu-tralized with salt-forming cations.
8. An article according to Claim 7 wherein (A) said substantially water-insoluble, highly neutralized hydrogel material is selected from acrylic acid grafted starch, polyacrylates, isobutylene maleic anhydride copolymers, and mixtures of these hydrogel materials;
(B) the weight ratio of fiber to highly neu-tralized hydrogel in the absorbent core ranges from about 50:50 to 95:5;
(C) the weight average particle size of the highly neutralized hydrogel material in said absor-bent core ranges from about 50 microns to 1 mm; and (D) the pH control agent component comprises from about 5% to 15% by weight of said absorbent article.
9. An article according to Claim 8 wherein said pH
control agent is selected from citric acid, adipic acid, azelaic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, levulenic acid, glycolic acid, succinic acid, fumaric acid, pimelic acid, suberic acid, sebacic acid, and acid phosphate salts, carboxymethylcellulose, oxidized cellulose, sulfoethyl-cellulose and phosphorylated cellulose.
10. A disposable absorbent article useful for absorbing discharged body fluids while also preventing or reducing diaper rash, said absorbent article comprising (A) a liquid impervious backing sheet;

(B) a relatively hydrophobic, liquid pervious topsheet; and (C) a flexible absorbent core positioned between said backing sheet and said topsheet, said flexible absorbent core consisting essentially of i) hydrophilic fiber material;
ii) particles of substantially water-in-soluble, highly neutralized hydrogel material distributed within at least a portion of said hydrophilic fiber materi-al, said highly neutralized hydrogel material having at least 50% of its acidic functional groups neutralized with salt-forming cations; and iii) one or more pH control agents suitable for maintaining skin pH within the range of from about 3.0 to 5.5 in the presence of urine and feces;
said substantially water-insoluble, highly neutralized hydrogel particles and said pH
control agents being non-uniformly distributed in distinct discrete zones within said flexi-ble absorbent core.
11. An article according to Claim 10 wherein (A) said substantially water-insoluble, highly neutralized hydrogel material is selected from acrylic acid grafted starch, polyacrylates, isobutylene maleic anhydride copolymers, and mixtures of these hydrogel materials;
(B) the weight ratio of fiber to hydrogel in the absorbent core ranges from about 50:50 to 95:5;
(C) the weight average particle size of the highly neutralized hydrogel material in said absorbent core ranges from about 50 microns to 1 mm; and (D) the pH control agent component comprises from about 5% to 15% by weight of said absorbent article.
12. An article according to Claim 11 wherein said pH
control agent is selected from citric acid, adipic acid, azelaic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, levulenic acid, glycolic acid, succinic acid, fumaric acid, pimelic acid, suberic acid, sebacic acid, acid phosphate salts, carboxymethylcellulose, oxidized cellulose, sulfoethylcellulose and phosphorylated cellulose.
13. An article according to Claim 11 wherein said pH
control agent is selected from polyacrylic acid and its poly-acrylate derivatives and poly(maleic acid) and its polymaleate derivatives.
14. An article according to Claim 11 wherein said pH
control agent is an ion-exchanging modified cellulose material in fiber form.
15. An article according to Claim 11 wherein the thickness of said absorbent core ranges from about 5 mm to 20 mm.
16. A disposable absorbent article useful for absorbing discharged body fluids while also preventing or reducing diaper rash, said absorbent article comprising (A) a liquid impervious backing sheet;
(B) a relatively hydrophobic, liquid pervious topsheet, and (C) a flexible absorbent core positioned between said backing sheet and said topsheets said core at least one distinct hydrogel-containing layer and at least one of distinct pH control agent-containing layer; wherein i) said hydrogel-containing layer consists essentially of a) hydrophilic fiber material; and b) particles of substantially wa-ter-insoluble, highly neutralized hydrogel material distributed within at least a portion of said hydro-philic fiber material, said highly neutralized hydrogel material having at least 50% of its acidic function-al groups neutralized with salt-forming cations; and ii) said pH control agent-containing layer consists essentially of a) hydrophilic fiber material; and b) one or more pH control agents suitable for maintaining skin pH
within the range of from about 3.0 to 5.5 in the presence of urine and feces.
17. An article according to Claim 16 wherein said absorbent core comprises a third distinct layer consisting essen-tially of hydrophilic fiber material with substantially no hydro-gel or pH control agent present, said third distinct layer being positioned between said highly neutralized hydrogel-containing layer and said pH control agent-containing layer.
18. An article according to Claim 16 wherein (A) said substantially water-insoluble, highly neutralized hydrogel material is selected from acrylic acid grafted starch, polyacrylates, isobutylene maleic anhydride copolymers, and mixtures of these hydrogel materials;
(B) the weight ratio of fiber to hydrogel in the absorbent core ranges from about 50:50 to 95:5;
(C) the weight average particle size of the highly neutralized hydrogel material in said absorbent core ranges from about 50 microns to 1mm; and (D) the pH control agent component comprises from about 5% to 15% by weight of said absorbent article.
19. An article according to Claim 18 wherein said pH
control agent is selected from citric acid, adipic acid, azelaic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, levulenic acid, glycolic acid, succinic acid, fumaric acid, pimelic acid, suberic acid, sebacic acid, and acid phosphate salts, carboxymethylcellulose, oxidized cellulose, sulfoethyl-cellulose and phosphorylated cellulose.
20. An article according to Claim 18 wherein said pH
control agent is selected from polyacrylic acid and its poly-acrylate derivatives and poly(maleic acid) and its polymaleate derivatives.
21. An article according to Claim 18 wherein said pH
control agent is an ion-exchanging modified cellulose material in fiber form.
22. A disposable absorbent article useful for absorbing discharged body fluids while also preventing or reducing diaper rash, said absorbent article comprising (A) a liquid impervious backing sheet;
(B) a relatively hydrophobic, liquid pervious topsheet; and (C) a flexible absorbent core comprising i) hydrophilic fiber material;
ii) substantially water-insoluble, highly neutralized hydrogel material having at least 50% of its acidic functional groups neutralized with salt-forming cations;
and iii) one or more pH control agents, suitable for maintaining skin pH within the range of from about 3.0 to 5.5 in the presence of urine and feces;
said highly neutralized hydrogel material and said pH control agent being non-uniformly distributed in distinct discrete zones of said core, said zones being defined by partitioning the flat surface of said absorbent core into at least one area of relatively high hydrogel concentration and at least one area of rela-tively high pH control agent concentration.
23. An article according to Claim 22 wherein the front two-thirds section of said article contains substantially all of the highly neutralized hydrogel material within said article and wherein the rear one-third of the article contains substantially all of the pH control agent within said article.
24. An article according to Claim 22 wherein (A) said substantially water-insoluble, highly neutralized hydrogel material is selected from acrylic acid grafted starch, polyacrylates, isobutylene maleic anhydride copolymers, and mixtures of these hydrogel materials;
(B) the weight ratio of fiber to highly neu-tralized hydrogel in the absorbent core ranges from about 50:50 to 95:5;
(C) the weight average particle size of the highly neutralized hydrogel material in said absor-bent core ranges from about 50 microns to 1mm;
and (D) the pH control agent component comprises from about 5% to 15% by weight of said absorbent article.
25. An article according to Claim 24 wherein said pH
control agent is selected from citric acid, adipic acid, azelaic acid, malic acid, tartaric acid, gluconic acid, glutaric acid, levulenic acid, glycolic acid, succinic acid, fumaric acid, pimelic acid, suberic acid, sebacic acid, and acid phosphate salts, carboxymethylcellulose, oxidized cellulose, sulfoethyl-cellulose and phosphorylated cellulose.
26. An article according to Claim 24 wherein said pH
control agent is selected from polyacrylic acid and its poly-acrylate derivatives and poly(maleic acid) and its polymaleate derivatives.
27. An article according to Claim 24 wherein said pH
control agent is an ion-exchanging modified cellulose material in fiber form.
CA000509084A 1985-05-15 1986-05-14 Disposable absorbent articles Expired CA1255887A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5509915A (en) 1991-09-11 1996-04-23 Kimberly-Clark Corporation Thin absorbent article having rapid uptake of liquid

Families Citing this family (153)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175024B (en) * 1985-04-15 1988-07-06 Procter & Gamble Absorbent structures
PH23760A (en) * 1985-05-15 1989-11-03 Procter & Gamble Disposable absorbent articles
US4848572A (en) * 1986-06-09 1989-07-18 Herrera Patricio B Feminine hygiene device
US5047023A (en) * 1986-07-18 1991-09-10 The Procter & Gamble Company Absorbent members having low density and basis weight acquisition zones
DE3712445A1 (en) * 1987-04-11 1988-10-20 Ver Papierwerke Ag HYGIENIC PULP PRODUCT WITH IMPROVED SKIN COMPATIBILITY
DE3719069A1 (en) * 1987-06-06 1988-12-15 Ver Papierwerke Ag Nappy pants
US5061259A (en) * 1987-08-19 1991-10-29 The Procter & Gamble Company Absorbent structures with gelling agent and absorbent articles containing such structures
US4842593A (en) * 1987-10-09 1989-06-27 The Procter & Gamble Company Disposable absorbent articles for incontinent individuals
DE3738601A1 (en) * 1987-11-13 1989-05-24 Ver Papierwerke Ag HYGIENIC CELLULAR ITEM
WO1989006142A1 (en) * 1988-01-05 1989-07-13 Liam Patrick Forde pH CONTROLLING ABSORBENT PRODUCT AND METHOD FOR PREPARING THE SAME
US4935022A (en) * 1988-02-11 1990-06-19 The Procter & Gamble Company Thin absorbent articles containing gelling agent
US5147343B1 (en) * 1988-04-21 1998-03-17 Kimberly Clark Co Absorbent products containing hydrogels with ability to swell against pressure
US4904249A (en) * 1988-06-06 1990-02-27 Kimberly-Clark Corporation Absorbent undergarment with fluid transfer layer and elasticized crotch design
ATE156692T1 (en) * 1989-12-19 1997-08-15 Procter & Gamble HYGIENIC DISPOSABLE LAUNDRY PIECE
US5026589A (en) * 1989-12-28 1991-06-25 The Procter & Gamble Company Disposable sanitary articles
US5149335A (en) * 1990-02-23 1992-09-22 Kimberly-Clark Corporation Absorbent structure
US5505718A (en) * 1990-04-02 1996-04-09 The Procter & Gamble Company Absorbent structures containing specific particle size distributions of superabsorbent hydrogel-forming materials
US5248309A (en) * 1990-07-19 1993-09-28 Kimberly-Clark Corporation Thin sanitary napkin having a central absorbent zone and a method of forming the napkin
CA2024558C (en) * 1990-07-19 2002-04-02 Paul John Serbiak Thin sanitary napkin having a central absorbent zone and a method of forming the napkin
US5419956A (en) * 1991-04-12 1995-05-30 The Procter & Gamble Company Absorbent structures containing specific particle size distributions of superabsorbent hydrogel-forming materials mixed with inorganic powders
US5422169A (en) * 1991-04-12 1995-06-06 The Procter & Gamble Company Absorbent structures containing specific particle size distributions of superabsorbent hydrogel-forming materials in relatively high concentrations
DE4118439A1 (en) * 1991-06-05 1992-12-10 Herbert Huettlin FLUID BED APPARATUS FOR TREATING PARTICLE-SHAPED GOODS
DE69217063T2 (en) * 1991-06-26 1997-05-15 Procter & Gamble SUCTIONABLE DISPOSABLE ITEM WITH BIODEGRADABLE PROTECTIVE FILM
DE4122359C2 (en) * 1991-07-05 1993-12-02 Helen Harper Hygienic Gmbh Absorbent material and its use
US5462537A (en) * 1991-07-31 1995-10-31 Kimberly-Clark Corporation Absorbent article with inversely related gradients
US5762620A (en) * 1992-04-02 1998-06-09 Ndm Acquisition Corp. Wound dressing containing a partially dehydrated hydrogel
US5429589A (en) * 1992-04-02 1995-07-04 New Dimensions In Medicine, Inc. Hydrogel gauze wound dressing
US5423736A (en) * 1992-04-02 1995-06-13 New Dimensions In Medicine, Inc. Wound dressing with dehydrated hydrogel gauze
US5695456A (en) * 1992-04-02 1997-12-09 Ndm, Inc. Wound packing and package therefor
US5482761A (en) * 1992-07-03 1996-01-09 The Procter & Gamble Company Layered, absorbent structure
US6340411B1 (en) 1992-08-17 2002-01-22 Weyerhaeuser Company Fibrous product containing densifying agent
US5998032A (en) 1992-08-17 1999-12-07 Weyerhaeuser Company Method and compositions for enhancing blood absorbence by superabsorbent materials
US7144474B1 (en) 1992-08-17 2006-12-05 Weyerhaeuser Co. Method of binding particles to binder treated fibers
EP0655970B1 (en) 1992-08-17 2002-10-09 Weyerhaeuser Company Particle binding to fibers
CA2114815C (en) 1993-02-24 2005-06-14 Mark Kevin Melius Absorbent composite
US5707364A (en) * 1993-08-11 1998-01-13 Tailored Technologies, Inc. Tailored and protective undergarments
US5941864A (en) * 1993-08-17 1999-08-24 The Procter & Gamble Company Disposable absorbent article having improved fecal storage
US5643588A (en) 1994-11-28 1997-07-01 The Procter & Gamble Company Diaper having a lotioned topsheet
US5849002A (en) * 1994-06-30 1998-12-15 Productos Internacionales Mabe, S.A Disposable diaper with reception, distribution-storage and anti-leakage zones within the absorbent core
IT1267494B1 (en) * 1994-11-10 1997-02-05 P & G Spa ABSORBENT MATERIAL, FOR EXAMPLE OF SUPER ABSORBENT TYPE, AND RELATIVE USE.
US6861571B1 (en) * 1994-11-28 2005-03-01 The Procter & Gamble Company Article having a lotioned topsheet
US6803496B2 (en) 1997-09-10 2004-10-12 The Procter & Gamble Company Method for maintaining or improving skin health
SE9502588L (en) 1995-07-13 1997-01-14 Moelnlycke Ab Inhibition of the growth of bacteria in connection with absorbent products by the addition of other bacteria
GB2311727A (en) * 1996-03-28 1997-10-08 Hanson Shaw Beverley Jane Sanitary article with treatment substance
US6951895B1 (en) 1996-12-02 2005-10-04 Kimberly-Clark Worldwide, Inc. Absorbent composition
US5952088A (en) * 1996-12-31 1999-09-14 Kimberly-Clark Worldwide, Inc. Multicomponent fiber
SE511838C2 (en) * 1997-06-17 1999-12-06 Sca Hygiene Prod Ab Reduction of undesirable side effects when using absorbent articles by means of pH control
US6140550A (en) * 1997-06-27 2000-10-31 Basf Aktiengesellschaft Water-absorbent article and method
US6089009A (en) 1997-08-28 2000-07-18 Belmont Textile Machinery Co., Inc. Fluid-jet false-twisting method and product
US6617488B1 (en) 1997-10-14 2003-09-09 Indicator Technologies, Inc. Method and apparatus for indicating the conditions in an absorbent article
US6201068B1 (en) 1997-10-31 2001-03-13 Kimberly-Clark Worldwide, Inc. Biodegradable polylactide nonwovens with improved fluid management properties
US6268434B1 (en) 1997-10-31 2001-07-31 Kimberly Clark Worldwide, Inc. Biodegradable polylactide nonwovens with improved fluid management properties
US6186992B1 (en) 1997-11-14 2001-02-13 The Procter & Gamble Company Viscous fluid bodily waste management article
US6013063A (en) * 1997-11-14 2000-01-11 The Procter & Gamble Company Viscous fluid bodily waste management article
US5977430A (en) * 1997-11-14 1999-11-02 The Procter & Gamble Company Absorbent article with macro-particulate storage structure
US7772455B1 (en) 1997-11-14 2010-08-10 The Procter & Gamble Company Disposable article providing improved management of bodily exudates
US5957906A (en) * 1997-11-14 1999-09-28 The Procter & Gamble Company Diaper with improved feces management properties
US6703537B1 (en) 1997-11-15 2004-03-09 The Procter & Gamble Company Absorbent article having improved fecal storage structure
US6156020A (en) * 1997-11-15 2000-12-05 The Procter & Gamble Company Absorbent article with micro-particulate storage member
US6222091B1 (en) 1997-11-19 2001-04-24 Basf Aktiengesellschaft Multicomponent superabsorbent gel particles
US6072101A (en) 1997-11-19 2000-06-06 Amcol International Corporation Multicomponent superabsorbent gel particles
US6623576B2 (en) 1998-10-28 2003-09-23 Basf Aktiengesellschaft Continuous manufacture of superabsorbent/ion exchange sheet material
US6342298B1 (en) 1997-11-19 2002-01-29 Basf Aktiengesellschaft Multicomponent superabsorbent fibers
TW503116B (en) * 1997-12-12 2002-09-21 Kimberly Clark Co Structure having balanced pH profile
ZA9810779B (en) * 1997-12-12 1999-09-21 Kimberly Clark Co Structure having balanced pH profile.
US6639120B1 (en) * 1997-12-12 2003-10-28 Kimberly-Clark Worldwide, Inc. Structure having balanced pH profile
US6309988B1 (en) 1997-12-22 2001-10-30 Kimberly-Clark Worldwide, Inc. Biodisintegratable nonwovens with improved fluid management properties
US6135987A (en) * 1997-12-22 2000-10-24 Kimberly-Clark Worldwide, Inc. Synthetic fiber
US6544455B1 (en) 1997-12-22 2003-04-08 Kimberly-Clark Worldwide, Inc. Methods for making a biodegradable thermoplastic composition
US6261677B1 (en) 1997-12-22 2001-07-17 Kimberly-Clark Worldwide, Inc. Synthetic fiber
US6306782B1 (en) 1997-12-22 2001-10-23 Kimberly-Clark Worldwide, Inc. Disposable absorbent product having biodisintegratable nonwovens with improved fluid management properties
EP1061963B1 (en) * 1998-03-12 2003-05-07 The Procter & Gamble Company Protease inhibitors in absorbent articles
US6066673A (en) 1998-03-12 2000-05-23 The Procter & Gamble Company Enzyme inhibitors
AU3082099A (en) * 1998-03-12 1999-09-27 Procter & Gamble Company, The Proton donating actives in absorbent articles
US6703536B2 (en) 1998-03-12 2004-03-09 The Procter & Gamble Company Disposable absorbent article having a skin care composition containing an enzyme inhibitor
US20040166183A1 (en) * 1998-05-20 2004-08-26 Ruseler-Van Embden Johanna G. H. Methods and means for preventing or treating inflammation or pruritis
US6149934A (en) * 1999-04-23 2000-11-21 Kimberly-Clark Worldwide, Inc. Absorbent article having a lotionized bodyside liner
US6197860B1 (en) 1998-08-31 2001-03-06 Kimberly-Clark Worldwide, Inc. Biodegradable nonwovens with improved fluid management properties
US6194483B1 (en) 1998-08-31 2001-02-27 Kimberly-Clark Worldwide, Inc. Disposable articles having biodegradable nonwovens with improved fluid management properties
US6211296B1 (en) * 1998-11-05 2001-04-03 The B. F. Goodrich Company Hydrogels containing substances
SE513375C2 (en) * 1998-12-16 2000-09-04 Sca Hygiene Prod Ab Absorbent articles having a material laminate comprising a liquid-permeable surface layer and a liquid-permeable liquid transfer layer
SE513261C2 (en) * 1998-12-16 2000-08-14 Sca Hygiene Prod Ab Absorbent articles comprising a synergistic combination of a pH-regulating substance and lactic acid bacteria
SE513374C2 (en) * 1998-12-16 2000-09-04 Sca Hygiene Prod Ab Absorbent structure in an absorbent article, comprising a partially neutralized superabsorbent material, and an absorbent article comprising the absorbent structure
AU767859B2 (en) 1998-12-16 2003-11-27 Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno Acidic superabsorbent polysaccharides
CO5150202A1 (en) 1998-12-31 2002-04-29 Kimberly Clark Co COMPOSITION OF FACIAL TISSU AND METHOD FOR USE FOR THE SECRETARY OF SKIN IRRITANTS OF THE NASAL SECRETION
ATE279219T1 (en) 1999-04-06 2004-10-15 Sca Hygiene Prod Zeist Bv HYGIENIC ABSORPENTS WITH ODOR CONTROL
US6515029B1 (en) 1999-04-23 2003-02-04 Kimberly-Clark Worldwide, Inc. Absorbent article having a hydrophilic lotionized bodyside liner
WO2000071177A1 (en) 1999-05-21 2000-11-30 The Procter & Gamble Company Absorbent article having a skin care composition
US6570054B1 (en) 1999-05-21 2003-05-27 The Procter & Gamble Company Absorbent article having a stable skin care composition
DE19929106A1 (en) * 1999-06-24 2000-12-28 John Patrick Formosa Diaper with absorbent body containing adsorbent enclosed in film, useful for babies and toddlers, contains adsorbent chemically formulated to high ammonia adsorption capacity
US6153209A (en) * 1999-09-28 2000-11-28 The Procter & Gamble Company Article having a transferable breathable skin care composition thereon
US6534554B1 (en) 1999-10-27 2003-03-18 Basf Aktiengesellschaft Multicomponent ion exchange resins
CO5200756A1 (en) 1999-11-03 2002-09-27 Sca Hygiene Prod Zeist Bv ALCALIS NEUTRALIZING SUPERABSORBENT PRODUCTS
US6459014B1 (en) * 1999-11-15 2002-10-01 Paragon Trade Brands, Inc. Absorbent article which maintains prolonged natural skin pH
DE19958697A1 (en) * 1999-12-06 2001-06-07 Basf Ag Absorbent preparation
US6417425B1 (en) * 2000-02-01 2002-07-09 Basf Corporation Absorbent article and process for preparing an absorbent article
IL138183A0 (en) * 2000-08-31 2001-10-31 Rostam Ltd Ph reducing formulation and delivery system for a tampon
US6503526B1 (en) 2000-10-20 2003-01-07 Kimberly-Clark Worldwide, Inc. Absorbent articles enhancing skin barrier function
US6756520B1 (en) 2000-10-20 2004-06-29 Kimberly-Clark Worldwide, Inc. Hydrophilic compositions for use on absorbent articles to enhance skin barrier
US20020120242A1 (en) * 2000-12-22 2002-08-29 Tyrrell David John Absorbent articles with hydrophilic compositions containing botanicals
US6749860B2 (en) 2000-12-22 2004-06-15 Kimberly-Clark Worldwide, Inc. Absorbent articles with non-aqueous compositions containing botanicals
US20020120241A1 (en) * 2000-12-22 2002-08-29 Tyrrell David John Absorbent articles with hydrophilic compositions containing anionic polymers
US7771735B2 (en) 2000-12-22 2010-08-10 Kimberly-Clark Worldwide, Inc. Absorbent articles with compositions for reducing irritation response
US20020128615A1 (en) 2000-12-22 2002-09-12 Tyrrell David John Absorbent articles with non-aqueous compositions containing anionic polymers
US7037571B2 (en) * 2000-12-28 2006-05-02 Kimberly-Clark Worldwide, Inc. Disposable shoe liner
US20020095127A1 (en) * 2000-12-28 2002-07-18 Kimberly-Clark Worldwide, Inc. Controlled delamination of laminate structures having enclosed discrete regions of a material
US20020102392A1 (en) * 2000-12-28 2002-08-01 Kimberly-Clark Worldwide, Inc. Flexible laminate structures having enclosed discrete regions of a material
US7166292B2 (en) * 2001-06-29 2007-01-23 The Procter & Gamble Company Top-biased beneficial components on substrates
US7005557B2 (en) * 2001-07-03 2006-02-28 The Procter & Gamble Company Film-forming compositions for protecting skin from body fluids and articles made therefrom
JP2002126001A (en) * 2001-07-30 2002-05-08 Daio Paper Corp Body fluid absorptive article
WO2003053487A1 (en) * 2001-12-20 2003-07-03 Basf Aktiengesellschaft Absorbent article
US6861477B2 (en) * 2001-12-21 2005-03-01 Kimberly-Clark Worldwide, Inc. Microphase separated superabsorbent compositions and method for making
GB0130666D0 (en) * 2001-12-21 2002-02-06 Accantla Holdings Ltd Absorbent tampons
US20030130636A1 (en) * 2001-12-22 2003-07-10 Brock Earl David System for improving skin health of absorbent article wearers
SE0104438L (en) * 2001-12-28 2003-06-29 Sca Hygiene Prod Ab Absorbent articles
DE10225943A1 (en) 2002-06-11 2004-01-08 Basf Ag Process for the preparation of esters of polyalcohols
US20040122389A1 (en) * 2002-12-23 2004-06-24 Mace Tamara Lee Use of hygroscopic treatments to enhance dryness in an absorbent article
US20050010183A1 (en) * 2003-06-24 2005-01-13 Weyerhaeuser Company Absorbent structure for absorbing blood
US20050075617A1 (en) * 2003-10-06 2005-04-07 Sca Hygiene Products Ab Absorbent article comprising an absorbent structure
SE0302634D0 (en) * 2003-10-06 2003-10-06 Sca Hygiene Prod Ab Absorbent articles comprising an absorbent structure
WO2005082525A1 (en) * 2004-02-27 2005-09-09 Fujio Abe Humidity conditioner and humidity conditioning method using the same
US20060173432A1 (en) * 2005-02-01 2006-08-03 Laumer Jason M Absorbent articles comprising polyamine-coated superabsorbent polymers
US20060269509A1 (en) * 2005-05-31 2006-11-30 Excelda Corporation Scent eliminating composition including colloidal silver
ATE546119T1 (en) * 2007-01-12 2012-03-15 Procter & Gamble ABSORBENT CORE WITH IMPROVED STRUCTURE
DE102007007203A1 (en) * 2007-02-09 2008-08-14 Evonik Stockhausen Gmbh Water-absorbing polymer structure with high ammonia binding capacity
US7935860B2 (en) 2007-03-23 2011-05-03 Kimberly-Clark Worldwide, Inc. Absorbent articles comprising high permeability superabsorbent polymer compositions
US8029484B2 (en) 2007-07-27 2011-10-04 Dicarlo Mary Margaret Universal diaper
EP2194944A1 (en) * 2007-09-19 2010-06-16 Senevens International LTD Non-woven biodegradable hygiene product
US20110046590A1 (en) * 2007-11-28 2011-02-24 Uni-Charm Corporation Absorbent wearing article
US20100247825A1 (en) * 2009-03-30 2010-09-30 Wood Willard E Malodor absorbent polymer and fiber
US8241747B2 (en) 2009-03-30 2012-08-14 Cellresin Technologies, Llc Malodor absorbent polymer and fiber
US20110245790A1 (en) * 2010-03-31 2011-10-06 Richard Earl Castro Night sweat pad
US9238348B2 (en) 2010-10-08 2016-01-19 Kimberly-Clark Worldwide, Inc. Method of manufacture of article for delivering health-benefit agent
US8552251B2 (en) 2010-10-08 2013-10-08 Kimberly-Clark Worldwide, Inc. Article with health-benefit agent delivery system
US9061269B2 (en) 2011-02-08 2015-06-23 Sumitomo Seika Chemicals Co., Ltd. Method for producing water-absorbent resin
JP2012239619A (en) * 2011-05-19 2012-12-10 Sumitomo Seika Chem Co Ltd Absorbing material
JP2012239620A (en) * 2011-05-19 2012-12-10 Sumitomo Seika Chem Co Ltd Absorbing material
WO2013023035A1 (en) 2011-08-09 2013-02-14 Herron Brandy K Prevention and treatment of groin dermatitis methods and systems
US9763837B2 (en) 2011-12-01 2017-09-19 Sca Hygiene Products Ab Absorbent article having fluid flow control member
WO2013130566A2 (en) 2012-02-29 2013-09-06 Hollister Incorporated Buffered adhesive compositions for skin-adhering medical products
US10470936B2 (en) 2012-02-29 2019-11-12 Hollister Incorporated Buffered adhesive compositions for skin-adhering medical products
JP6292763B2 (en) * 2013-04-11 2018-03-14 株式会社リブドゥコーポレーション Absorbent articles
JP6253241B2 (en) 2013-04-11 2017-12-27 株式会社リブドゥコーポレーション Absorbent articles
US10182616B2 (en) * 2014-02-18 2019-01-22 Catherine Maureen O'Brien Shoe liners and method for making the same
PL3040062T3 (en) 2014-12-29 2018-02-28 Paul Hartmann Ag Absorbent structure, and absorbent item comprising this absorbent structure
RU2660052C1 (en) * 2015-03-13 2018-07-04 Ска Хайджин Продактс Аб HYGIENE PRODUCT COMPRISING A pH-REGULATING COMPOSITION AND METHOD OF MANUFACTURING THEREOF
JP6930424B2 (en) * 2015-12-08 2021-09-01 王子ホールディングス株式会社 Absorbent article
TWM531259U (en) * 2016-06-27 2016-11-01 Garry Tsaur Skin-friendly absorption structure for supplying oxygen
JP6880638B2 (en) * 2016-10-14 2021-06-02 王子ホールディングス株式会社 Absorbent material
MX2019014680A (en) * 2017-06-07 2020-02-07 Essity Hygiene & Health Ab Absorbent article with skin ph-adjusting effect.
WO2022019218A1 (en) * 2020-07-22 2022-01-27 住友精化株式会社 Water-absorbent resin composition, method for producing water-absorbent resin composition, and method for slowing water absorption rate of water-absorbent resin particles
DE102020134790A1 (en) * 2020-12-23 2022-06-23 Paul Hartmann Ag Incontinence article with pH regulator
DE102021102760A1 (en) 2021-02-05 2022-08-11 Paul Hartmann Ag Incontinence article with transfer component

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB748135A (en) * 1953-02-27 1956-04-25 Edward Charles Edmund Hemsted Improvements in and relating to tampons, pads and the like
US3004895A (en) * 1959-04-17 1961-10-17 Samuel M Schwartz Diaper rash preventative
US3067745A (en) * 1959-08-12 1962-12-11 Johnson & Johnson Absorbent product
GB1317156A (en) * 1969-06-05 1973-05-16 Boots Co Ltd Babies napkins
US3658790A (en) * 1970-04-22 1972-04-25 Kimberly Clark Co Absorbent fiber products from phosphorylated cellulose fibers and process therefor
US3691154A (en) * 1970-05-05 1972-09-12 Kimberly Clark Co Absorbent fibers of phosphorylated cellulose with ion exchange properties
US3843701A (en) * 1970-06-19 1974-10-22 Allied Chem The aluminum salt of cinnamohydroxamic acid
LU64742A1 (en) * 1972-02-07 1973-08-21
US3920015A (en) * 1972-09-12 1975-11-18 Allied Chem Diaper resistant to ammonia odor formation
US3793299A (en) * 1972-10-02 1974-02-19 Procter & Gamble Cellulose graft polymer ion exchange material
US3794034A (en) * 1973-02-27 1974-02-26 J Jones Odor reductant body waste pad
DE2448471A1 (en) * 1973-10-15 1975-04-24 Procter & Gamble DISPOSABLE BANDAGE, IN PARTICULAR - DIAPER
US3889678A (en) * 1973-12-07 1975-06-17 Personal Products Co Cellulose graft copolymer containing non-ionic and ionic polymer moieties as absorbent media in absorbent dressings
JPS50150296A (en) * 1974-05-25 1975-12-02
US3935862A (en) * 1974-06-12 1976-02-03 Personal Products Company Inhibition of conditions arising from microbial production of ammonia
US3964486A (en) * 1974-08-19 1976-06-22 The Procter & Gamble Company Disposable diaper containing ammonia inhibitor
US4020271A (en) * 1975-01-13 1977-04-26 Personal Products Company Crosslinked phosphonoalkyl cellulose and absorbent devices incorporating same
US4066584A (en) * 1975-08-11 1978-01-03 Akzona Incorporated Alloy fibers of rayon and copolymers of acrylic and methacrylic acids
PH13425A (en) * 1976-05-10 1980-04-23 Du Pont 2,3,8,12b-tetrahydro 1 h-3a,8-methano-dibenzo(3,4,6,7)cyclohepta(1,2-c)pyrrole derivatives pharmaceutical compositions containing same and method
JPS5745057A (en) * 1980-09-02 1982-03-13 Shinko Chem Water absorbing material
US4382919A (en) * 1980-09-15 1983-05-10 Bristol-Myers Company Composition for treatment and prevention of malodorous generating skin conditions
US4381782A (en) * 1981-04-21 1983-05-03 Kimberly-Clark Corporation Highly absorbent materials having good wicking characteristics which comprise hydrogel particles and surfactant treated filler
JPS6043469B2 (en) * 1981-12-15 1985-09-28 ライオン株式会社 Diaper treatment agent with excellent diaper rash prevention effect
US4543410A (en) * 1982-06-21 1985-09-24 Morca, Inc. Absorbent cellulosic base structures
US4610678A (en) * 1983-06-24 1986-09-09 Weisman Paul T High-density absorbent structures
DK167952B1 (en) * 1983-03-10 1994-01-10 Procter & Gamble ABSORBENT STRUCTURE, WHICH IS A MIXTURE OF HYDROFILE FIBERS AND WATER-SOLUBLE HYDROGEL IN THE FORM OF SEPARATE PARTICLES OF CROSS-BOND POLUMED MATERIAL, PROCEDURE FOR THE PREPARATION OF SAME AND SINGLE PREPARATION
DE3337444A1 (en) * 1983-10-14 1985-04-25 Henkel KGaA, 4000 Düsseldorf THE USE OF PH-REGULATING MATERIALS
DE3337443A1 (en) * 1983-10-14 1985-04-25 Chemiefaser Lenzing Ag, Lenzing MATERIALS REGULATING THE PH VALUE AND THEIR PRODUCTION

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5509915A (en) 1991-09-11 1996-04-23 Kimberly-Clark Corporation Thin absorbent article having rapid uptake of liquid

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GB2175210A (en) 1986-11-26
US4685909A (en) 1987-08-11
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AU5741586A (en) 1986-11-20
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FI862008A (en) 1986-11-16
ES294160Y (en) 1989-02-01
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GB2175210B (en) 1988-12-07
PT82571B (en) 1988-03-03
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IE861281L (en) 1986-11-15
AU580411B2 (en) 1989-01-12
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FI87309C (en) 1992-12-28
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MA20680A1 (en) 1986-12-31
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JP2608052B2 (en) 1997-05-07
DK226186A (en) 1986-11-16

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