WO2014035306A1 - Hygiene article with odour control substance and method for producing it - Google Patents

Hygiene article with odour control substance and method for producing it Download PDF

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Publication number
WO2014035306A1
WO2014035306A1 PCT/SE2012/050926 SE2012050926W WO2014035306A1 WO 2014035306 A1 WO2014035306 A1 WO 2014035306A1 SE 2012050926 W SE2012050926 W SE 2012050926W WO 2014035306 A1 WO2014035306 A1 WO 2014035306A1
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WO
WIPO (PCT)
Prior art keywords
oxidized
antioxidant
hygiene article
oil
lipid
Prior art date
Application number
PCT/SE2012/050926
Other languages
French (fr)
Inventor
Kent Malmgren
Ulla Forsgren Brusk
Chatrine Stridfeldt
Veronica LOPEZ-DURAN
Original Assignee
Sca Hygiene Products Ab
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.)
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Publication date
Application filed by Sca Hygiene Products Ab filed Critical Sca Hygiene Products Ab
Priority to PCT/SE2012/050926 priority Critical patent/WO2014035306A1/en
Priority to PCT/SE2013/051018 priority patent/WO2014035327A1/en
Publication of WO2014035306A1 publication Critical patent/WO2014035306A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS 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
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/84—Accessories, not otherwise provided for, for absorbent pads
    • A61F13/8405—Additives, e.g. for odour, disinfectant or pH control
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS 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
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/20—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS 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
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/46—Deodorants or malodour counteractants, e.g. to inhibit the formation of ammonia or bacteria

Definitions

  • the present invention refers to a hygiene article such as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard, underlay or wipe, said hygiene article containing an odour control substance in the form of an oxidized lipid.
  • a hygiene article such as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard, underlay or wipe
  • said hygiene article containing an odour control substance in the form of an oxidized lipid.
  • the invention also refers fo a method fo producing a hygiene article containing an odour control substance in the form of an oxidized lipid,
  • Odour control has become an important factor in hygiene articles. Odours occur e.g. as result of discharges from the wearer of an absorbent hygiene article or as a result of the storage of bodily fluids in the article. These odours can be embarrassing for the wearer of the article. It is important, therefore, to reduce or prevent odours from occurring in absorbent articles while they are being worn. If is also desirable to be able to clean the urogenital area from odour substances by a wipe and/or to prevent odour to occur.
  • odour substances that may occur in absorbent hygiene articles are sulphur compounds, aldehydes, indoles, amines etc.
  • Various methods are used to prevent or reduce odours in absorbent hygiene articles that have arisen in conjunction with the discharge of bodily fluids.
  • the methods are based on 1 ⁇ masking of the odours; 2) a chemical reaction, for exampl in the form of neutralization, with an acid/base system; 3) adsorption/absorption of odours involving the creation of surfaces which exhibit a special affinity to the odours or large specific surfaces/cavities which are able to bind the odou s concerned and thus to prevent them from remaining in gaseous form, or 4 ⁇ bacteria inhibitors which reduce/control the growth of bacteria and associated odours that have arisen because of high bacteria counts.
  • Perfumes or fragrances are used, for example, in order to mask odours.
  • Maskers do not remove the odourss and must be added in an appropriate quantity to ensure that the odour is covered and that the perfume does not smell too strongiy: Zeolites, silicone dioxide, clays, active carbon and/or cyciodexthn, for example, are used for the adsorption of odour substances. Some of these are susceptible to moisture, however, which restricts their effectiveness. Sodium bicarbonate eitric acid and/or superabsorbent materials wit a low pH are used for the neutralization of certain odours. Bacteria can generate
  • a superabsorbent material with silver ions and/or an acidic superabsorbent material can be used to reduce the growth of bacteria.
  • the above-mentioned odour control substances are effective against different kinds of odours and act with different mechanisms.
  • a number of odours are hydrophobic, and such odours are absorbed and/or adsorbed b hydrophobic odour control substances.
  • Hydrophobic odouriferous substances include, for example, certain organic acids, sulphur compounds, aldehydes, indole, amines, etc., which commonl occur in conjunction with the use of absorbent articles.
  • Described in US 6 147 028 is an odour control substance in the form of polysiloxane- coated starch granules that are used in absorbent products.
  • the starch granules have a hydrophobic surface, and they absorb hydrophobic materia! from the air.
  • US 6 479 150 describes material layers of thermoplastic fibres with a hydrophobic odour control substance that is modified with surface-active substance in order to make the layer wettable.
  • the odour control substance is, for example, an aromatic odour control substance.
  • Previously disclosed odour control substances suffer from th disadvantage, among other things, that they are difficult to distribute uniformly throughout the whole of the absorbent product. This is attributable to the fact that previously disclosed odour control materials often consist of solid particles, which cannot be distributed continuously over the interna! and external surfaces of the product and as such reduce the degree of coverage. The possibility of trapping undesirable odours in an effective manner is reduced in this way.
  • GB 1 282 889 discloses a deodourani composition
  • a deodourani composition comprising at least one calcium, aluminium, magnesium or zinc salt of an unsaturated aliphatic hydroxycarboxylic acid having at least 17 carbons
  • Jt is further told that these metal salts can be combined with saturated aliphatic hydroxycarboxylic acids and unsaturated aliphatic hydroxycarboxylic acids.
  • the saturated hydroxycarboxylic acids may either be naturally saturated or derived from oxidation products of unsaturated fatty acids, such as oleic acid, ricinofeic acid, lino!eic acid and inolenic acid, These unsaturated fatt acids upon mild oxidation lead to corresponding pure hydroxyearboxy!ic acids. Pure hydroxyear oxyiic acids have very !ow oxidizing ability on other substances and a peroxide value ciose to D meq/kg,
  • WO 2008/058565 discloses absorbent articles comprising a peroxy compound as an S organic zinc salt, in particular zinc ricinoieate, which ar to!d to have a synergistic effect in the suppression of malodours, such as ammonia.
  • WO 2009/082287 discloses an absorbent article comprising oxidized lipids as odour control substance.
  • the lipids are oxidized under controlled conditions, e g with ozone, to0 have a peroxide value of at feast 20 meq/kg,
  • WO 2010/039084 discloses a wipe to which has been added an oxidized lipid as odour control substance.
  • the lipids are oxidized to have a peroxide value of at least 20 meq/kg. 5
  • the need remains to develop odour control substances for hygiene products, and one object of the present invention is to develop a hygiene article comprising an effectively functioning odour control material in the form of an oxidized lipid, wherein the formatio of undesired volatile substances caused by decomposition of the oil is reduced or prevented also during long storage periods.
  • a hygiene article suoh as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard, underlay or wipe, said hygiene article containing an odour control substance in the form of an oxidized5 lipid, wherein said oxidized lipid has a peroxide value as measured by AOCS Official Method Cd 8-53 between 100 and 1000 meq/kg and contains an antioxidant in an amount of at least 0.15 wt% as calculated on the weight of the oxidized lipid.
  • the oxidized lipids may have a peroxide value as measured by AOCS Officiai Method Cd 8-53 of at least 150, preferably at least 200 and not more than 350, aiy not more than 325 meq/kg.
  • the antioxidant may be an oil soluble antioxidant.
  • the oil soluble antioxidant may foe chosen from vitamin E, gum guaiae, propyl galSate, butylated hydroxyaniso!, butylate hydroxytoluene or 2,4,5-tririydtOxy hydro-quinone, vitamin K, vitamin A, vitamin D or caroienoids,.
  • Vitamin £ exists in eight different forms including four tocotrienols (a, ⁇ , y, ⁇ ) and four tocopherols (ct, ⁇ ⁇ , ⁇ ). Examples of caroienoids are ⁇ -carotene, lutein, lycopene.
  • the oxidized lipid may contain at least 0.2 wt% and more preferably at least 0,5 wt% antioxidant
  • the oxidised lipid may contain up to 5 wt%. preferably up to 3 wf% and more preferably up to 2 wt% antioxidant
  • the lipids may foe fatty acids or derivatives thereof.
  • the fatty acid derivatives may be esters of fatty acids, especially triglycerides. At least part of the fatty acids and/or fatty acid derivatives may be unsaturated.
  • the oxidized lipids may be oxidized by treatment with oxygen
  • the invention further refers to a method of producing a hygiene article such as a sanitary napkin, pant finer, diaper, pant diaper, adult incontinence guard, underlay or wipe, said hygiene article containing an odour control substance, said method comprising the steps of oxidizing a lipid so that it will have a peroxide value as measured by AOCS Official Method Cd 8-53 between 100 and 1000 meq/kg, subsequently adding an antioxidant to the oxidized lipid and adding said oxidized lipid containing the antioxidant to said hygiene article or to a component which is to be incorporated in said hygiene article.
  • a hygiene article such as a sanitary napkin, pant finer, diaper, pant diaper, adult incontinence guard, underlay or wipe
  • said hygiene article containing an odour control substance
  • the lipid may be oxidized with oxygen gas.
  • the lipid may be exerted to UV radiatio during oxidation.
  • the antioxidant may be added in an amount at least 0.16 wt% as ealcuiated on the weight of the oxidized lipid.
  • the term "hygiene article” ' refers to an article used for persona! hygiene especially for absorbing bodily exudates, like urine, feces and menstrual fluid, or for wiping the skin to remove such bodily exudates.
  • Exam les of such hygiene articles include feminine hygiene products such as sanitary napkins, panty liners and sanitary panties, diapers and pant diapers for infants and incontinent adults, incontinence pads, diaper inserts, underlays, washcloths, patches, towe!eltes, napkins, wet wipes, and the like.
  • the invention mainly refers to disposabie hygiene articles, which means articles that are not intended to be laundered or otherwise restored or reused after a single use.
  • lipid * denotes all fat-soluble (lipophilic), naturally-occurring , substances, such as fats, oils, waxes, cholesterol, steroids, monogiycerides, diglyeerides, triglycerides, phospholipids, and others.
  • oxidized lipids is meant that the lipids have undergone an oxidation process wherein oxygen has been introduced in th lipid molecular structure.
  • Th oxidation agent is any agent, which leads to oxidation of the lipid structure, e.g. oxygen gas, ozone or peroxides.
  • antioxidant is meant a compound thai inhibits the oxidation of other molecules.
  • Oxidation reactions can produce free radicals and antioxidants have the ability to eliminate such intermediates.
  • Natural animal-derived or plant-derived lipids are very often mixtures of mono-, di ⁇ and triglycerides and free fatty acids.
  • the lipids can be purified, hydrated, refined, modified- and used individuall -or in different mixtures. Examples of suitabl lipids which originate from animals can be found in bees waxes, emu oil, factis lipida, lanolin, shark' liver oil, Sard, whale oil, butter fat and tallow.
  • lipids which originate from plants can be found in apricot kernel oil, ground nut oil, avocado oil/wax, blackcurrant seed oil, borage seed oil, Brazil nut oil, castor oil, cocoa butter* coconut oil, maiz oil, cotton seed oil, rose hip seed oil, evening primrose oil, grape seed oil, linseed oil, mango seed oil, rose oil, olive oil, orange wax, palm oil, ground nut oil, rice - wax, sesame seed oil.
  • lipids are waxy oils, which are esters of mono-alcohols, for example Jojoba oil, phospholipids etc.
  • Triglycerides are commonly occurring in many natural fats and oils, such as fapeseed oil, olive oil, maize oil, sunflower oil, palm oil, coooanut oil and butter, palm oil, cacao butter, iheobroma oil etc. Most of the naturally occurring triglycerides contain a mixture of saturated and unsaturated fatty acids, while the proportion of saturated and unsaturated fatty acids varies between the different oils. This proportion is usuall given as the quotient: unsaturated/saturated, The unsaturated fatty acids may either be monoun saturated or polyunsaturated.
  • fatt acids in triglycerides are palmitic acid, a saturated fatty acid, oleic acid, a monounsaturated fatty acid, Imoleic and !inolersie acids, which are polyunsaturated fatty acids.
  • composition of some common natural oils are given in Table 1 below, which is taken from Bailey ' s Industrial Oil and Fat products, vol.1 , editor: Daniel Swern, John Wiley & Sons Inc., Hew York, 1979.
  • oils and fats normally contain small amounts of antioxidants, either naturally occurring o added by a supplier, so that auto idation caused by contact with air is substantially prevented or delayed.
  • the lipids used in the present invention are oxidized by an oxidizing agent.
  • useful oxidizing agents are: oxygen gas. ozone, peroxides, peroxy acids and nitrogen dioxide.
  • the naturally occurring antioxidants wilt be destroyed during such oxidation (J, Am. Oil Chem. Soc. (2009 88:898-90; Sabiiov et at; Effects of Temperature and UV Light on Degradation of a ⁇ Tocopherorin Free and Dissolved Form.
  • the reactivity of different lipids is dependent on the number of double bonds, i.e. the degree of unsafurafion. Saturated lipids oxidize very slowly while lipids with a high degree of unsaturato oxidize more rapidly.
  • the oxidation should be performed under controlled conditions until a desired peroxide value is reached.
  • th oxidized lipids should hav a. peroxide value as measured by AOCS Official Method Cd 8-63 between 100 and 1QQG meq/kg.
  • the oxidized lipids may have a peroxide value of at least 150 or at least 200 q/kcf. They may further have a peroxide value of not more than 350 or not more than 325 meq/kg.
  • Th lipids may be oxidized by any suitable method and by any suitable oxidation agent, for example by oxygen, ozone, mixtures of ozone/air or ozone/oxygen.
  • the preferred oxidation agent according to th invention is oxygen gas.
  • the lipids may further be exerted to UV-radiation during oxidation with oxygen gas,
  • a series of peroxidic products may be formed, sueh as hydroperoxides, ozonides, diperoxides, peroxides and polyperoxldes.
  • Certain by-products may also be formed, for example Ketones and aldehydes, which are less desired, These by-products may be removed b washing the iipids with a solvent after the oxidation process. Alternatively volatile undesired substances may be removed by evaporation, for example under vacuum.
  • Oxidation with oxygen gas instead of ozone reduces the formation of at least some of these undesired by-products.
  • autoxidafion and/or decomposition of the oxidized lipids during storage remains.
  • Such autoxidafion may result in the formation of undesired by-products, such as aldehydes and ketones. These by-products have an unpleasant odour.
  • antioxidants are preferably oil-soluble.
  • useful oil-soluble antioxidants are vitamin £, gum guaiac, propyl gallate, butylated hydroxyanisol, butylated hydroxytoiuene or 2,4,5- trihydrexy bydre-quinone, vitamin K, vitamin A, vitamin D or carotenoids.
  • Vitamin E exists in eight different forms including four focofrienois (a, y, ⁇ ) a d: four tocopherols (a, y t ⁇ ).
  • carotenoids are ⁇ -carotene, lutein., iyoopene.
  • the antioxidant should be added to the oxidized lipid in an amount of at least 0.15 t%, preferably at least 0,2 wt% or more preferably at least 0.5 wt% antioxidant as calculated on the weight of the oxidized lipid.
  • the amount of antioxidant may be up to 5 wi%, preferably up to 3 wt% or more preferabl up to 2 wt% antioxidant as calculated on the weight of the oxidized lipid.
  • the antioxidant that has been tested in the examples below is a » iocopherol.
  • One or more essential oils such as chamomile, clove, lemon, lavender, rosemary and sandalwood may optionally be added to the oxidized lipid.
  • the oxidized lipids may thus be added to wood pulp fibres, for example eellulosic fluff pulp, which frequently is used in the absorbent core of a hygiene absorbent article* such as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard or underlay.
  • a hygiene absorbent article* such as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard or underlay.
  • the oxidized Itpids may be added to the topsheet of such an absorbent article or any additional functional layer contained in the absorbent article, such as liquid reeeivlno, layer, liquid distribution layer, liquid storage layer etc.
  • Th pulp fibres treated with oxidized lipid may be mixed with untreated pulp and/or with superabsorbent material to form an absorbent core.
  • An absorbent core can contain between 0.2 and 50% by weight, preferably between 0.5 and 40% b weight, more preferably between 1 and 35% by weight and most preferably between 3 and 30% by weight of added oxidized lipids calculated on the total weight of the hydrophtilc fibres, for example pulp fibres, contained in the absorbent core.
  • a higher proportion of the oxidized lipids may be used than in the central area of the absorbent core.
  • the fibres in the edge areas may then be more or less saturated with the oxidized lipids and function as leak barriers.
  • the treated fibres can be positioned in a waistband region or in areas around the ieg openings. They can then prevent odours from escaping from the article.
  • the oxidized lipids can be added to elastic means forming part of for example waist elastics or leg elastics " m an absorbent article.
  • the oxidized lipids can be uniformly or non ⁇ uniformiy distributed in an other layer in an absorbent article* such as the topsbeet, a liquid receiving layer, a liquid distribution layer or th like.
  • the proportion by weight of the oxidized liquid in these layers can be the same as for the absorbent core.
  • odour control material for example, and/or superabsorbent materials with a low pH.
  • Cellulose fibres can be acidified, for example, by the addition of a buffer/acid.
  • the acidic odour control materials deal with odouriferous substances that are alkaline, for example, such as amines and ammonia. Acidic odour control materials are capable, if added in a sufficient quantity, of lowering the pN and, by so doing, of inhibiting th growth/activity of bacteria which in tur produce substances that are able to contribute to a badodour.
  • odour control substances can also be added to the article, for example chitosan, activated carbon, zeolites, clay, silicone dioxides, cyc!odextnn, starch-based odour control substances and esters.
  • the esters can be selected from among cyclical esters or esters selected from among isomentyl; acetate, isonientyi propionate, isomentyl isobutyrate, isomentyl crotonate and isomentyl butyrate.
  • essential oils such as lavender, sandalwood, lemon, chamomile, clove and rosemary oil may be added to the oxidized oil,
  • the oxidized lipids can he added to the pul fibres, or other fibres, in conjunction with the production of the f ibres or be added in the production apparatus in which the absorbent articles are produced.
  • the amount of oxidized lipids added may vary* dependant on the intended use.0
  • higher amounts of the oxidized lipids may be used in the urogenital area, where it is an advantage that the lipids remain on the skin, than in hand wiping , where it may he desired that only small amounts of the lipids remain.
  • the ipe can contain betwee 0.01 and 15 ⁇ g, preferabiy between 0.1 and 8 g/g, more5 preferably between 0.2 and 4 ⁇ /g and most preferably between 0.3 and 3 ;g/g of added oxidized lipids calculated on the total weight of the wipe.
  • the amounts may differ dependant on the intended use.
  • composition containing the oxidized lipids is preferably
  • the oxidized lipids may be distributed evenly throughout the wipe, Alternatively, the oxidized lipids may be localized in specific areas of the wipe, especially on the surface5 thereof, so as to be easily released from th wipe and transferred to the skin
  • composition with which the wipes of the present inventio is impregnated may , in addition to the oxidized lipids, contain one or more of the following components: a viscosity regulating agent, a earner for the oxidized lipid or an agent for improving the adhesion of the composition to the sk n,
  • viscosity regulating agents include polyethylene glycol (PEG) and glycerol.
  • Quaternary tenside may be used as agents for improving the adhesion to skin.
  • oxidized lipids in wipes may also inhibit the growth/activity of bacteria which in turn produce substances that are able to contribute to a bad odour.
  • the inhibition of growth/activity of unwanted bacteria is also important for hygienic reasons, both in the urogenital area, but also in handwiping. Frequent handwiping occurs for example i restaurants, kitchens, in medical care premises, in schools, in day care centers, industry, workshops etc.
  • the oxidized lipids may aiso have a skin care effect.
  • odour control substances can aiso be added to the wipe, for example chitosan, activated carbon, zeolites, ciay, silicone dioxides, cyciodextrin, starch-based odour contra! substances and esters.
  • the esters can be selected from among cyclical esters or esters selected from among isomentyi acetate, isomentyi propionate, isomentyi isobutyrate, isomentyi crotenate and isomentyi butyrate,
  • the carrier material used in the wipe should be chosen so that it can hold the oxidized lipids in its porous structure and release it to the skin when the wipe is used. It shall preferably also be capable to absorb substances that have been wiped off the skin.
  • suitable carrier materials are fibrous materials such as tissue paper, airlaid tissue and different type of nonwoven materials.
  • suitable nonwoven materials are bydroenta ogled webs, spunbond, meltblown, thermobonded webs etc.
  • Further examples of carrier materials are foams, nets, films etc.
  • the oxidised lipids may be applied between film layers and exposed when separating the film layers from each other and/or applied in formed recesses in the film.
  • the structure of the carrier material is important for its function to hold liquid substances, A material that is especially suitable in this respect is hydroentangled webs.
  • Fibres that are useful in fibrous carrier materials are pulp fibres, cotton fibres, bamboo fibres and other natural fibres, regenerated cellulose fibres such as viscose, iyocell, polyoiefin fibres, like polyethylene and polypropylene, polyester and mixtures thereof.
  • f or a so called wet wipe a suitable fibre composition ma be a mixture of viscose fibres and polyeste fibres, fo example 70 wt% viscose fibres and 30 w % polyester.
  • a common fibre composition in other type of wipes is a mixture of pul fibres and polypropylene.
  • a suitable basis weight for a personal hygiene wipe is between 30 and 70 g/m 2 , preferably between 40 and 50 g/m 2 .
  • composition comprising the oxidized lipids may be added to the carrier materia! by spraying, coating or impregnation.
  • the degree of oxidatio was tested by determining the peroxid value according to the test method AOCS Official Method Od 8-53; Peroxide Value Acetic Acid - Chloroform yethod. The peroxide value for both the starting oils and the oxidized oils was determined. The results are given in Table 3 below.
  • Sheets of fluff-grade bleached sulphate memep from International Paper were impregnated with a solution of the tested oil in acetone.
  • a pulp sheet weighing 4 g was added 1.71 g oil in 1.71 g acetone.
  • the solution was evenly distributed over the surface of the sheets.
  • the sheets contained 30 wt% oil and 70 wt% memep fibers.
  • the sheets were defibrafed in an !KA Al l basic Analytical mill to produce fluffed memep during approximately 1 minute.
  • pulps with 3 wt% and 10 wt% were prepared, in those cases 0.12 g and 0.44 g of oil were added respectively.
  • Solution B.2 From solution B.1 were taken 0,8 ml and placed in a vial with 9 ,4 ml of disii lied water.
  • the vial was then placed in an oven and after 3 hours at a temperatur of 30°C. after this time a SPWE fibre (Supelco), 75 urn Garboxen-PDMS, was Injected into the headspace above the memep and after additional 0.5 h the SP E fiber was analyzed with gas chromatography (GC), thermo Finnigan Tree, with a US detector. The chromatographic analysis was carried out on a Termo Finnigan Trac GC with a MS detector. The GC was equipped with a split/spliitess injector, mode sp!itless and 18Q°C in the transfer line. The column used was a ZB-624 (ZeoFon),30 m, 0,25 mm i d, 1.40 p film thickness. The MS. mode was full scan, when the compounds were analysed the following mass number S were chosen;
  • N i, ⁇ Pmk. are ..af sample with untrmte4 - lpJi
  • Example 3 Preparation of oxidized sunflower oils with different peroxides values 200 mL of sunflower was placed in a beaker of 11 cm, heated and gas bubbling through the oil (gas flGw ⁇ SO i/h), a magnetic stirrer was used in the beaker, Simultaneously, a Mineratight UV Lamp, I todei S ⁇ 68, 220Volts. 50 Hz, 0,65 Amps was used for sample irradiation. The distance between the UV lamp and the oil surface was 5 cm. Different reaction conditions were tested. Sunflower oil was oxidized at different temperatures: 55, 80 and 110 °G. The influence of the bubbled gas was also tested, in this case it was bubbied oxygen, air or no gas bubbling. Results are shown in Table 5.
  • an antioxidant in the form of a-toeopfwol was added to some of the oxidized oils from Example 1
  • the following amounts of a-fQCopheroi were added: 0.15 ' Wt , 0.5 wt%, 1 wt%.
  • the aniounts of a-tocopherol were caicuiated on the weight of the oxidized oil,
  • Example S Measurements of wsfatlte substances from memeo samples containing oxidized vegetaMe oils with and without a-tocop ⁇ rol after different storage times SP E «-M$ was used to determine the relative changes in volaii!es formed in sunflower oil during the storage.
  • 1 g of oxidized oli was placed into a vial.
  • the QPME needle was pierced through the septum of the sample vial, exposing the fiber io the i? headspace of the sample for 30 min. This allowed the analytes to reach their near- equilibriurrt concentration with the active phase of the fiber. Subsequently, the needle was pierced through the inlet septum on the GC injector and the fiber was exposed for 5 min.
  • the MS spectra library was used for identification of the measured compounds.
  • TafeSe Pulp * 30% ox dized sunflower oil
  • Sheets of fluff-grade bleached sulphate were impregnated with a solution of the tested oil in acetone.
  • the solution was evenly distributed over .the surface of the sheets.
  • the sheets were defibrated in an IKA A11 basic Analytical mil! to produce fluffed pul during approximately 1 minute.
  • Solution A,2 From solution A. I were taken 50 pL and placed in other vial With 22,44 g ⁇ 300.
  • Odour reduction (%) f 1 - f ; Ac ai peak area xWQ% ⁇

Abstract

A hygiene article such as a sanitary napkin:, panty liner, diaper, pant diaper, adult incontinence guard, underlay or wipe, wherein said hygiene article contain an odour control substance in the form of an oxidized lipid. The oxidized Iipid has a peroxide value as measured by AOCS Official Method Cd 8-53 between 100 and 1000 meq/kg and contains an -antioxidant in an amount of at least 0,15 wt% as calculated on the weight of the oxidized lipid.

Description

X
HYGIENE' ARTICLE WITH ODOUR CONTROL SUBSTANCE AMD METHOD FOR
PRODUCING IT
TECHNICAL FIELD
The present invention refers to a hygiene article such as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard, underlay or wipe, said hygiene article containing an odour control substance in the form of an oxidized lipid. The invention also refers fo a method fo producing a hygiene article containing an odour control substance in the form of an oxidized lipid,
BACKGROUND OF THE INVENTION
Odour control has become an important factor in hygiene articles. Odours occur e.g. as result of discharges from the wearer of an absorbent hygiene article or as a result of the storage of bodily fluids in the article. These odours can be embarrassing for the wearer of the article. It is important, therefore, to reduce or prevent odours from occurring in absorbent articles while they are being worn. If is also desirable to be able to clean the urogenital area from odour substances by a wipe and/or to prevent odour to occur.
Examples of odour substances that may occur in absorbent hygiene articles are sulphur compounds, aldehydes, indoles, amines etc.
Various methods are used to prevent or reduce odours in absorbent hygiene articles that have arisen in conjunction with the discharge of bodily fluids. The methods are based on 1} masking of the odours; 2) a chemical reaction, for exampl in the form of neutralization, with an acid/base system; 3) adsorption/absorption of odours involving the creation of surfaces which exhibit a special affinity to the odours or large specific surfaces/cavities which are able to bind the odou s concerned and thus to prevent them from remaining in gaseous form, or 4} bacteria inhibitors which reduce/control the growth of bacteria and associated odours that have arisen because of high bacteria counts.
Perfumes or fragrances are used, for example, in order to mask odours. Maskers do not remove the odourss and must be added in an appropriate quantity to ensure that the odour is covered and that the perfume does not smell too strongiy: Zeolites, silicone dioxide, clays, active carbon and/or cyciodexthn, for example, are used for the adsorption of odour substances. Some of these are susceptible to moisture, however, which restricts their effectiveness. Sodium bicarbonate eitric acid and/or superabsorbent materials wit a low pH are used for the neutralization of certain odours. Bacteria can generate
substances with an unpleasant odour, and copper acetate, a superabsorbent material with silver ions and/or an acidic superabsorbent material can be used to reduce the growth of bacteria. The above-mentioned odour control substances are effective against different kinds of odours and act with different mechanisms.
A number of odours are hydrophobic, and such odours are absorbed and/or adsorbed b hydrophobic odour control substances. Hydrophobic odouriferous substances Include, for example, certain organic acids, sulphur compounds, aldehydes, indole, amines, etc., which commonl occur in conjunction with the use of absorbent articles.
Described in US 6 147 028 is an odour control substance in the form of polysiloxane- coated starch granules that are used in absorbent products. The starch granules have a hydrophobic surface, and they absorb hydrophobic materia! from the air.
US 6 479 150 describes material layers of thermoplastic fibres with a hydrophobic odour control substance that is modified with surface-active substance in order to make the layer wettable. The odour control substance is, for example, an aromatic odour control substance.
Previously disclosed odour control substances suffer from th disadvantage, among other things, that they are difficult to distribute uniformly throughout the whole of the absorbent product. This is attributable to the fact that previously disclosed odour control materials often consist of solid particles, which cannot be distributed continuously over the interna! and external surfaces of the product and as such reduce the degree of coverage. The possibility of trapping undesirable odours in an effective manner is reduced in this way.
GB 1 282 889 discloses a deodourani composition comprising at least one calcium, aluminium, magnesium or zinc salt of an unsaturated aliphatic hydroxycarboxylic acid having at least 17 carbons, Jt is further told that these metal salts can be combined with saturated aliphatic hydroxycarboxylic acids and unsaturated aliphatic hydroxycarboxylic acids. The saturated hydroxycarboxylic acids may either be naturally saturated or derived from oxidation products of unsaturated fatty acids, such as oleic acid, ricinofeic acid, lino!eic acid and inolenic acid, These unsaturated fatt acids upon mild oxidation lead to corresponding pure hydroxyearboxy!ic acids. Pure hydroxyear oxyiic acids have very !ow oxidizing ability on other substances and a peroxide value ciose to D meq/kg,
WO 2008/058565 discloses absorbent articles comprising a peroxy compound as an S organic zinc salt, in particular zinc ricinoieate, which ar to!d to have a synergistic effect in the suppression of malodours, such as ammonia.
WO 2009/082287 discloses an absorbent article comprising oxidized lipids as odour control substance. The lipids are oxidized under controlled conditions, e g with ozone, to0 have a peroxide value of at feast 20 meq/kg,
WO 2010/039084 discloses a wipe to which has been added an oxidized lipid as odour control substance. The lipids are oxidized to have a peroxide value of at least 20 meq/kg. 5 The need remains to develop odour control substances for hygiene products, and one object of the present invention is to develop a hygiene article comprising an effectively functioning odour control material in the form of an oxidized lipid, wherein the formatio of undesired volatile substances caused by decomposition of the oil is reduced or prevented also during long storage periods.
SUMMARY OP r rnvKNTtm
The above defined problem is solved in the present invention by a hygiene article suoh as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard, underlay or wipe, said hygiene article containing an odour control substance in the form of an oxidized5 lipid, wherein said oxidized lipid has a peroxide value as measured by AOCS Official Method Cd 8-53 between 100 and 1000 meq/kg and contains an antioxidant in an amount of at least 0.15 wt% as calculated on the weight of the oxidized lipid.
The oxidized lipids may have a peroxide value as measured by AOCS Officiai Method Cd 8-53 of at least 150, preferably at least 200 and not more than 350, preferataiy not more than 325 meq/kg.
The antioxidant may be an oil soluble antioxidant. The oil soluble antioxidant may foe chosen from vitamin E, gum guaiae, propyl galSate, butylated hydroxyaniso!, butylate hydroxytoluene or 2,4,5-tririydtOxy hydro-quinone, vitamin K, vitamin A, vitamin D or caroienoids,. Vitamin £ exists in eight different forms including four tocotrienols (a, β, y, δ) and four tocopherols (ct, β γ, δ). Examples of caroienoids are β-carotene, lutein, lycopene.
The oxidized lipid may contain at least 0.2 wt% and more preferably at least 0,5 wt% antioxidant The oxidised lipid may contain up to 5 wt%. preferably up to 3 wf% and more preferably up to 2 wt% antioxidant
The lipids may foe fatty acids or derivatives thereof. The fatty acid derivatives may be esters of fatty acids, especially triglycerides. At least part of the fatty acids and/or fatty acid derivatives may be unsaturated. The oxidized lipids may be oxidized by treatment with oxygen
The invention further refers to a method of producing a hygiene article such as a sanitary napkin, pant finer, diaper, pant diaper, adult incontinence guard, underlay or wipe, said hygiene article containing an odour control substance, said method comprising the steps of oxidizing a lipid so that it will have a peroxide value as measured by AOCS Official Method Cd 8-53 between 100 and 1000 meq/kg, subsequently adding an antioxidant to the oxidized lipid and adding said oxidized lipid containing the antioxidant to said hygiene article or to a component which is to be incorporated in said hygiene article.
The lipid may be oxidized with oxygen gas.
The lipid may be exerted to UV radiatio during oxidation.
The antioxidant may be added in an amount at least 0.16 wt% as ealcuiated on the weight of the oxidized lipid. DEFINITIONS
The term "hygiene article"' refers to an article used for persona! hygiene especially for absorbing bodily exudates, like urine, feces and menstrual fluid, or for wiping the skin to remove such bodily exudates. Exam les of such hygiene articles include feminine hygiene products such as sanitary napkins, panty liners and sanitary panties, diapers and pant diapers for infants and incontinent adults, incontinence pads, diaper inserts, underlays, washcloths, patches, towe!eltes, napkins, wet wipes, and the like. The invention mainly refers to disposabie hygiene articles, which means articles that are not intended to be laundered or otherwise restored or reused after a single use.
The term "lipid* denotes all fat-soluble (lipophilic), naturally-occurring, substances, such as fats, oils, waxes, cholesterol, steroids, monogiycerides, diglyeerides, triglycerides, phospholipids, and others.
By "oxidized lipids" is meant that the lipids have undergone an oxidation process wherein oxygen has been introduced in th lipid molecular structure. Th oxidation agent is any agent, which leads to oxidation of the lipid structure, e.g. oxygen gas, ozone or peroxides.
B "antioxidant" is meant a compound thai inhibits the oxidation of other molecules.
Oxidation reactions can produce free radicals and antioxidants have the ability to eliminate such intermediates. DETAILED DESCRIPTION OF THE INVENTION
It has been shown that oxidized lipids, are very effective in reducing certain odouriferous Substances which are commonly occurring In hygiene articles. Natural animal-derived or plant-derived lipids are very often mixtures of mono-, di~ and triglycerides and free fatty acids. The lipids can be purified, hydrated, refined, modified- and used individuall -or in different mixtures. Examples of suitabl lipids which originate from animals can be found in bees waxes, emu oil, factis lipida, lanolin, shark' liver oil, Sard, whale oil, butter fat and tallow. Examples of suitable lipids which originate from plants can be found in apricot kernel oil, ground nut oil, avocado oil/wax, blackcurrant seed oil, borage seed oil, Brazil nut oil, castor oil, cocoa butter* coconut oil, maiz oil, cotton seed oil, rose hip seed oil, evening primrose oil, grape seed oil, linseed oil, mango seed oil, rose oil, olive oil, orange wax, palm oil, ground nut oil, rice - wax, sesame seed oil. shea butter, soybean oil, sunflower seed wax, peanut oil, sesame oil, safflower oil, tobaccoseed oil, poppyseed oil, teased oil, kapok oil, iee bran oil, sorghum oil, crarnbe oil, linseed oil, peritla oil, hempseed oil, tung oil, oiticica oil, palm kern oil, sweet almond oil and wheat germ oil. Further exampies of lipids are waxy oils, which are esters of mono-alcohols, for example Jojoba oil, phospholipids etc.
Triglycerides are commonly occurring in many natural fats and oils, such as fapeseed oil, olive oil, maize oil, sunflower oil, palm oil, coooanut oil and butter, palm oil, cacao butter, iheobroma oil etc. Most of the naturally occurring triglycerides contain a mixture of saturated and unsaturated fatty acids, while the proportion of saturated and unsaturated fatty acids varies between the different oils. This proportion is usuall given as the quotient: unsaturated/saturated, The unsaturated fatty acids may either be monoun saturated or polyunsaturated. The most commonly occurring fatt acids in triglycerides are palmitic acid, a saturated fatty acid, oleic acid, a monounsaturated fatty acid, Imoleic and !inolersie acids, which are polyunsaturated fatty acids.
The composition of some common natural oils are given in Table 1 below, which is taken from Bailey's Industrial Oil and Fat products, vol.1 , editor: Daniel Swern, John Wiley & Sons Inc., Hew York, 1979.
Figure imgf000007_0001
Such oils and fats normally contain small amounts of antioxidants, either naturally occurring o added by a supplier, so that auto idation caused by contact with air is substantially prevented or delayed.
The lipids used in the present invention are oxidized by an oxidizing agent. Examples of useful oxidizing agents are: oxygen gas. ozone, peroxides, peroxy acids and nitrogen dioxide. The naturally occurring antioxidants wilt be destroyed during such oxidation (J, Am. Oil Chem. Soc. (2009 88:898-90; Sabiiov et at; Effects of Temperature and UV Light on Degradation of a~Tocopherorin Free and Dissolved Form. The reactivity of different lipids is dependent on the number of double bonds, i.e. the degree of unsafurafion. Saturated lipids oxidize very slowly while lipids with a high degree of unsaturato oxidize more rapidly.
The oxidation should be performed under controlled conditions until a desired peroxide value is reached. Preferably th oxidized lipids should hav a. peroxide value as measured by AOCS Official Method Cd 8-63 between 100 and 1QQG meq/kg. The oxidized lipids may have a peroxide value of at least 150 or at least 200 q/kcf. They may further have a peroxide value of not more than 350 or not more than 325 meq/kg. Th lipids may be oxidized by any suitable method and by any suitable oxidation agent, for example by oxygen, ozone, mixtures of ozone/air or ozone/oxygen. The preferred oxidation agent according to th invention is oxygen gas. The lipids may further be exerted to UV-radiation during oxidation with oxygen gas, At the oxidation process a series of peroxidic products may be formed, sueh as hydroperoxides, ozonides, diperoxides, peroxides and polyperoxldes. Certain by-products may also be formed, for example Ketones and aldehydes, which are less desired, These by-products may be removed b washing the iipids with a solvent after the oxidation process. Alternatively volatile undesired substances may be removed by evaporation, for example under vacuum.
Oxidation with oxygen gas instead of ozone reduces the formation of at least some of these undesired by-products. However the problem of autoxidafion and/or decomposition of the oxidized lipids during storage remains. Such autoxidafion may result in the formation of undesired by-products, such as aldehydes and ketones. These by-products have an unpleasant odour.
Addition of ah antioxidant to the oxidised fipids after oxidation will prevent autoxidation and/or decomposition and the formation of such undesired by-products. The antioxidant is preferably oil-soluble. Examples of useful oil-soluble antioxidants are vitamin £, gum guaiac, propyl gallate, butylated hydroxyanisol, butylated hydroxytoiuene or 2,4,5- trihydrexy bydre-quinone, vitamin K, vitamin A, vitamin D or carotenoids.. Vitamin E exists in eight different forms including four focofrienois (a, y, δ) a d: four tocopherols (a, yt δ). Examples of carotenoids are β-carotene, lutein., iyoopene.
The antioxidant should be added to the oxidized lipid in an amount of at least 0.15 t%, preferably at least 0,2 wt% or more preferably at least 0.5 wt% antioxidant as calculated on the weight of the oxidized lipid. The amount of antioxidant may be up to 5 wi%, preferably up to 3 wt% or more preferabl up to 2 wt% antioxidant as calculated on the weight of the oxidized lipid.
The antioxidant that has been tested in the examples below is a»iocopherol.
One or more essential oils, such as chamomile, clove, lemon, lavender, rosemary and sandalwood may optionally be added to the oxidized lipid.
The oxidized lipids ma thus be added to wood pulp fibres, for example eellulosic fluff pulp, which frequently is used in the absorbent core of a hygiene absorbent article* such as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard or underlay. Alternatively or in addition the oxidized Itpids may be added to the topsheet of such an absorbent article or any additional functional layer contained in the absorbent article, such as liquid reeeivlno, layer, liquid distribution layer, liquid storage layer etc.
Th pulp fibres treated with oxidized lipid may be mixed with untreated pulp and/or with superabsorbent material to form an absorbent core. An absorbent core can contain between 0.2 and 50% by weight, preferably between 0.5 and 40% b weight, more preferably between 1 and 35% by weight and most preferably between 3 and 30% by weight of added oxidized lipids calculated on the total weight of the hydrophtilc fibres, for example pulp fibres, contained in the absorbent core.
In certain areas, for example along the edges of the absorbent core and/or other functional layer of the absorbent article, a higher proportion of the oxidized lipids may be used than in the central area of the absorbent core. The fibres in the edge areas may then be more or less saturated with the oxidized lipids and function as leak barriers. In garment-like article, such as diapers and pant article the treated fibres can be positioned in a waistband region or in areas around the ieg openings. They can then prevent odours from escaping from the article. Alternatively the oxidized lipids can be added to elastic means forming part of for example waist elastics or leg elastics "m an absorbent article. in the same manner as described above with respect to the absorbent core, the oxidized lipids can be uniformly or non~uniformiy distributed in an other layer in an absorbent article* such as the topsbeet, a liquid receiving layer, a liquid distribution layer or th like. The proportion by weight of the oxidized liquid in these layers can be the same as for the absorbent core.
Other methods for applying the oxidized lipids to a component in an absorbent article are by spraying, coating or impregnation.
Depending on the kind of absorbent article product, the proportion of oxidized lipids will vary. Panty liners, for example, do not require the same quantity of odour control material as an incontinence product. Odours in absorbent articles differ in respect of their character. In order to achieve an even better odour-controlling effect, other types of odour control materials or odour control substances can also be used in the absorbent articles according to the present invention. These can be acidified cellulos fibres, for example, and/or superabsorbent materials with a low pH. Cellulose fibres can be acidified, for example, by the addition of a buffer/acid. The acidic odour control materials deal with odouriferous substances that are alkaline, for example, such as amines and ammonia. Acidic odour control materials are capable, if added in a sufficient quantity, of lowering the pN and, by so doing, of inhibiting th growth/activity of bacteria which in tur produce substances that are able to contribute to a badodour.
Other odour control substances can also be added to the article, for example chitosan, activated carbon, zeolites, clay, silicone dioxides, cyc!odextnn, starch-based odour control substances and esters. The esters can be selected from among cyclical esters or esters selected from among isomentyl; acetate, isonientyi propionate, isomentyl isobutyrate, isomentyl crotonate and isomentyl butyrate. As mentioned above essential oils, such as lavender, sandalwood, lemon, chamomile, clove and rosemary oil may be added to the oxidized oil,
S The oxidized lipids can he added to the pul fibres, or other fibres, in conjunction with the production of the f ibres or be added in the production apparatus in which the absorbent articles are produced.
For wipes the amount of oxidized lipids added may vary* dependant on the intended use.0 For example in personal hygiene higher amounts of the oxidized lipids may be used in the urogenital area, where it is an advantage that the lipids remain on the skin, than in hand wiping , where it may he desired that only small amounts of the lipids remain.
The ipe can contain betwee 0.01 and 15 § g, preferabiy between 0.1 and 8 g/g, more5 preferably between 0.2 and 4 §/g and most preferably between 0.3 and 3 ;g/g of added oxidized lipids calculated on the total weight of the wipe. The amounts may differ dependant on the intended use.
Upon use of the wipes the composition containing the oxidized lipids is preferably
0 transferred an delivered to the skin fhereby serving as skin treatment agent, especiall for odour control and/or bacteria control.
The oxidized lipids may be distributed evenly throughout the wipe, Alternatively, the oxidized lipids may be localized in specific areas of the wipe, especially on the surface5 thereof, so as to be easily released from th wipe and transferred to the skin
The composition with which the wipes of the present inventio is impregnated may , in addition to the oxidized lipids, contain one or more of the following components: a viscosity regulating agent, a earner for the oxidized lipid or an agent for improving the adhesion of the composition to the sk n, Examples of viscosity regulating agents include polyethylene glycol (PEG) and glycerol. Quaternary tenside may be used as agents for improving the adhesion to skin. Other components which may be contained in the composition are cleaning agents, skin care agents, antibacterial agents, fragrances etc The presence of oxidized lipids in wipes may also inhibit the growth/activity of bacteria which in turn produce substances that are able to contribute to a bad odour. The inhibition of growth/activity of unwanted bacteria is also important for hygienic reasons, both in the urogenital area, but also in handwiping. Frequent handwiping occurs for example i restaurants, kitchens, in medical care premises, in schools, in day care centers, industry, workshops etc. Besides the odour and bacteria control effects, the oxidized lipids may aiso have a skin care effect.
Other odour control substances can aiso be added to the wipe, for example chitosan, activated carbon, zeolites, ciay, silicone dioxides, cyciodextrin, starch-based odour contra! substances and esters. The esters can be selected from among cyclical esters or esters selected from among isomentyi acetate, isomentyi propionate, isomentyi isobutyrate, isomentyi crotenate and isomentyi butyrate, The carrier material used in the wipe should be chosen so that it can hold the oxidized lipids in its porous structure and release it to the skin when the wipe is used. It shall preferably also be capable to absorb substances that have been wiped off the skin.
Examples of suitable carrier materials are fibrous materials such as tissue paper, airlaid tissue and different type of nonwoven materials. Examples of nonwoven materials are bydroenta ogled webs, spunbond, meltblown, thermobonded webs etc, Further examples of carrier materials are foams, nets, films etc. In the case of films the oxidised lipids may be applied between film layers and exposed when separating the film layers from each other and/or applied in formed recesses in the film. The structure of the carrier material is important for its function to hold liquid substances, A material that is especially suitable in this respect is hydroentangled webs.
Fibres that are useful in fibrous carrier materials are pulp fibres, cotton fibres, bamboo fibres and other natural fibres, regenerated cellulose fibres such as viscose, iyocell, polyoiefin fibres, like polyethylene and polypropylene, polyester and mixtures thereof. f or a so called wet wipe a suitable fibre composition ma be a mixture of viscose fibres and polyeste fibres, fo example 70 wt% viscose fibres and 30 w % polyester. A common fibre composition in other type of wipes is a mixture of pul fibres and polypropylene.
A suitable basis weight for a personal hygiene wipe is between 30 and 70 g/m2, preferably between 40 and 50 g/m2.
The composition comprising the oxidized lipids may be added to the carrier materia! by spraying, coating or impregnation.
Example 1, Oxidation of vegetable oils
200 ml of vegetable oil (sunflower oil, corn oil or olive ©it} was placed in a beaker of 11 cm, heated and oxygen bubbling through the oi! (gas flow~80 Ufa), a magnetic stirrer was used in the beaker. Simultaneously, a Mineralight UV Lamp, Mode! 8-88, 220VoSts, SO Hz, 0,65 Amps was use for sample irradiation. Th distance between the UV lamp and the oil surface was 5 cm. Depending on th oil, reaction time and temperature for achieving th highest peroxid value change. The results are given in Table 2.
Table 2. Reaction conditions to achieve t e highest peroxide value
Figure imgf000013_0001
The degree of oxidatio was tested by determining the peroxid value according to the test method AOCS Official Method Od 8-53; Peroxide Value Acetic Acid - Chloroform yethod. The peroxide value for both the starting oils and the oxidized oils was determined. The results are given in Table 3 below.
Table 3. Peroxide values of native and oxidized oils
Figure imgf000013_0002
Oiiv Oil 8
Oxidized Olive Oil 347
Example 2. Analysis of odour reduction Treatment of pulp with oils
Sheets of fluff-grade bleached sulphate puip from International Paper, were impregnated with a solution of the tested oil in acetone. To a pulp sheet weighing 4 g was added 1.71 g oil in 1.71 g acetone. The solution was evenly distributed over the surface of the sheets. When the acetone had evaporated, the sheets contained 30 wt% oil and 70 wt% puip fibers. The sheets were defibrafed in an !KA Al l basic Analytical mill to produce fluffed puip during approximately 1 minute. Following the same procedure pulps with 3 wt% and 10 wt% were prepared, in those cases 0.12 g and 0.44 g of oil were added respectively.
For the experiment four (4) malodour substances were used: dimethyl sulfide (DMS), dimethyl disulfide (D DS), isova!eraidehyde and diacefyi. Due to the difference between the solubility of the compounds two different solutions were prepared (Solution A and Solution 8)
« Solution A:
- Solution A. I . In a vial wih septum were placed 22,14 g polyethy!eneglycol with a molar weight 300 g/mo! (PEG3Q0), 115 pL DMS, SO pL OMOQ and 120 pi isovaieraidehyde.
- Solution A.2; From solution A.I were taken 50 pL and placed in another vial with 22,44 g PEG3QQ.
88 Solution 8:
- Solution 8.1 ; To a 250 mi volumetric flask were added 10S pt diacety! using distilled water as solvent.
- Solution B.2: From solution B.1 were taken 0,8 ml and placed in a vial with 9 ,4 ml of disii lied water.
Odour reduction measurement;
1 g treated pulp was placed in a 80 ml vial, after which 3.9 mi of 0.01 phosphate buffer saline pH 7.4 from Sigma was added with 0.1 mL of the desired odour solution (A.2 or B.2). The final concentrations were 300 ng/ml for dimethyl sulfide (D S), dimethyldisuifide (DMDS) and Isovaieraidehyde (I AL), 600 ng/ml for diacefy!.
The vial was then placed in an oven and after 3 hours at a temperatur of 30°C. after this time a SPWE fibre (Supelco), 75 urn Garboxen-PDMS, was Injected into the headspace above the puip and after additional 0.5 h the SP E fiber was analyzed with gas chromatography (GC), thermo Finnigan Tree, with a US detector. The chromatographic analysis was carried out on a Termo Finnigan Trac GC with a MS detector. The GC was equipped with a split/spliitess injector, mode sp!itless and 18Q°C in the transfer line. The column used was a ZB-624 (ZeoFon),30 m, 0,25 mm i d, 1.40 p film thickness. The MS. mode was full scan, when the compounds were analysed the following mass number S were chosen;
■82 for DMS, 58 f r1VAL,
94 for D DS; 88 for diacetyl.
The peak area of each odour substance was■determined for samples with treated pulp and an untreated reference pulp, results are shown in Table 4. The odour reduction in0 comparison to untreated .pulp.' was made by equation (1):
Odou reduction (%) - fi- (™ ^ ^ ^. , ) \ *i00¾ (1)
N i, \Pmk. are ..af sample with untrmte4 - lpJi
Table 4, Results odour reduction (%)
5
Figure imgf000015_0001
Example 3. Preparation of oxidized sunflower oils with different peroxides values 200 mL of sunflower was placed in a beaker of 11 cm, heated and gas bubbling through the oil (gas flGw^SO i/h), a magnetic stirrer was used in the beaker, Simultaneously, a Mineratight UV Lamp, I todei S~68, 220Volts. 50 Hz, 0,65 Amps was used for sample irradiation. The distance between the UV lamp and the oil surface was 5 cm. Different reaction conditions were tested. Sunflower oil was oxidized at different temperatures: 55, 80 and 110 °G. The influence of the bubbled gas was also tested, in this case it was bubbied oxygen, air or no gas bubbling. Results are shown in Table 5.
Figure imgf000016_0001
Example 4.Tesis with different amounts of added oils having different peroxides values
This experiment was made using 3% and 30% addition of the sunflower oil The different .peroxides values were tested, for sunflower oil the peroxides values were: 14, 34, 85, 101 , 235, 324, 363 and 396 roeq/Kg. The measurement of peroxide valu and the odour characterizatio was made as described in example 1 and 2. Tables 8 and 7 show the results. Table 8. % odour reduction after 3wt% addition ©xtdteed sunflower oil
Figure imgf000017_0001
Table 7. % odour reduction after 30wi% addition of oxidized sunf !ower oil
Figure imgf000017_0002
Example S, Preparation of oxMteet vegetable oils eontasnlftg es-toeophero!
After completed oxidation an antioxidant in the form of a-toeopfwol was added to some of the oxidized oils from Example 1 The following amounts of a-fQCopheroi were added: 0.15 'Wt , 0.5 wt%, 1 wt%. The aniounts of a-tocopherol were caicuiated on the weight of the oxidized oil,
Example S. Measurements of wsfatlte substances from puio samples containing oxidized vegetaMe oils with and without a-tocop ^rol after different storage times SP E«-M$ was used to determine the relative changes in volaii!es formed in sunflower oil during the storage. 1 g of oxidized oli was placed into a vial. The QPME needle was pierced through the septum of the sample vial, exposing the fiber io the i? headspace of the sample for 30 min. This allowed the analytes to reach their near- equilibriurrt concentration with the active phase of the fiber. Subsequently, the needle was pierced through the inlet septum on the GC injector and the fiber was exposed for 5 min. The MS spectra library was used for identification of the measured compounds.
The analyses were conducted after 0, 2, 4, 8 and 12 weeks of storag in order to study the stability of oxidized sunflower oil. Since the oxidized oils have a variety of volatile compounds, only five of them wer chosen, in this way, it is easier to see how the chosen volatile compounds change over time; results are shown in Table 8 and 9.
TafeSe 8. Pulp * 30% ox dized sunflower oil
Figure imgf000018_0001
j hexanal 34.3 j 183,9 190, 1 239,4 J 50,8
Table 9. Pulp * 30% Μ feed unf lower ell cont ining 1wt% ©-tocopherol
Figure imgf000018_0002
Example ?. Analysis of odour redaction after 12 weeks of storage
It was iraportani to test if oxidized oils containing a-focophero! were able of reducing odours, in this experiment, the efficiency of oxidized sunflower oii after 12 weeks was also tested. Added levels of cHQcopherolwere 1 %, 0.2% and 0,01 %, Treatment: of puip with oils
Sheets of fluff-grade bleached sulphate puip from international Paper, were impregnated with a solution of the tested oil in acetone. To pulp sheet weighing 4 g was added 1 .71 g oil in 1.71 g acetone. The solution was evenly distributed over .the surface of the sheets. When the acetone had evaporated, the sheets contained 30 wt% oil and 70 wt% pulp fibers. The sheets were defibrated in an IKA A11 basic Analytical mil! to produce fluffed pul during approximately 1 minute.
For the experiment three (3) maiodour substances were used: dimethyl sulfide (DMS), dimethyl disulfide {DMDS} and isovaleraldehyde (IVAL)
* Solutio A:
- Solution A T: in a via! wih septum were placed 22,14 g potyefhy!enegiyeoi with a molar weight 300 g/moie (PEG300), 115 pL DMS, 80 jjrSL DMDS and 120 pL isovaleraldehyde.
- Solution A,2: From solution A. I were taken 50 pL and placed in other vial With 22,44 g ΡΕΘ300.
Odour reduction measurement:
1 g treated pulp was placed in a 80 mi vial, after which 3,9 ml of 0,01 phosphate buffer saline pH 7.4 from Sigma was added with 0,1 ml of the odou solution. The final concentrations were 300 ng m! for dimethyl sulfide {QMS), dimethyfdisulfsde (DMDS) and Isovaleraldehyde (IVAL). The vial was then placed in an oven and after 3 hours at a temperature of 30°C. after this time a SPME fibre {Supelco}, 75 um Carboxen-PDMS, was injected info the headspace above the pulp and after additional 0,5 h the S E fiber was analyzed with gas chromatography (GC), ther o Finnigan Tree, with a MS detector. The chromatographic analysis was carried out on a 'Term© Finnigan Trace GC with a MS detector. The GC was equipped with a split/split!ess injector, mode sp!itless and SO^C i the transfer line. The column used was a ZB-024 (Zebron),30 m, 0.2δ mm i d, 1 ,40 um film thickness. The MS mode was full scan, when the compounds were analysed the following mass numbers were chosen:
02 for DMS, 58 for !VAL,
94 for ΌΜΏ&, 86 for diacety!. The peak area of each odour substance was determined for samples with treated pulp and an untreated reference pulp, results are show in Table 10, The odour reduction in comparison to untreated pulp was made by equation (T):
Odour reduction (%) = f 1 - f ; Ac ai peak area xWQ% ^
N I xPeak ar of smipl with untreatm pi p i Table 10, Odour. reduction after addition of a-toeopheroi and com arison be ween samples after 8 and 12 weeks
Figure imgf000020_0001

Claims

1. A hygiene article such as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard, underlay or wipe, said hygiene■article containing an odour control substance i the form of an oxidized lipid ehmmtenmd in thai said oxidized lipid' has a peroxide value as measured by A0CS Official Method Cd 8-53 between 100 and 1000 meq/kg and contains an antioxidant in an amount of at least 0.15 wt% as calculated on the weight of the oxidized lipid,
2. A hygiene article as claimed in claim 1 , charactcri d m that th oxidized lipids have a peroxide value as measured by AOCS Official Method Cd 8-@3 of at least 150, preferabl at least 200 and not more tha 350, preferably not more than 325 meq/kg.
3. A hygiene article as claimed in claim 1 or 2, characterized in■that the antioxidant is an oil soluble antioxidant
4. A hygiene articte as claimed i claim 3, Ghamcierized r in that the oil solubl antioxidant is chosen from vitamin E, gum guaiac, propyl galiate, buty!ated hydroxyanisof, butyl'ated hydroxytoluene or 2,4,5~trihydroxy hydro-quinone, vitamin ft vitamin A, vitamin D or carotenoids,
5. A hygiene articte as claimed i claim 4, characterize in that the oil soluble vitamin is a-tocopherot.
6, A hygiene article as claimed i any of the precedi g claims, G ar&ct®ri d in that the oxidized lipid contains at least 0.2 wt% and more preferably at least 0 5 wt antioxidant.
7. A hygiene article as claimed i claim 6, characterized m that the oxidized lipid contains up to 6 wt%, preferably up to 3 wt% and more preferably up to 2 wl% antioxidant.
8. A hygien article as claimed in any of the preceding claims, chmact&rimd in that the lipids are fatt acids or derivatives thereof.
9. A hygiene article as ciaimed in claim 8, c m&ci izMd in that the fatty acid derivatives are esters of fatty acids, especially triglycerides.
10. A hygiene article as claimed in claim 8 or 9, chatacterimd in thai at least part of the fatty acids■ and/or fatty acid derivatives are unsaturated.
11. A hygiene article as claimed in any o the preceding claims, characterized in that said oxidized lipids are oxidized by treatment with oxygen,
12. A method of producing a hygiene article such as a sanitary napkin, panty liner, diaper, pant diaper, adult incontinence guard, underlay or wipe, said hygiene article containing an odour control substance as claimed in any of claims 1-11, characterize m oxidizing a lipid so that it wilt have a peroxide value as measured by AQCS Official Method Cd 8-53 between 100 and 1000 meq/kg, subsequently adding an antioxidant to the oxidized lipid and adding said oxidized lipid containing the antioxidant to said hygiene article or to a component which is to be incorporated in said hygiene article.
13. A method as claimed in claim 12, characterized m oxidizing the lipid with oxygen gas.
14. A method as claimed in claim 12 or 13, G & ct&rl ed in exerting the lipid to UV radiation during oxidation .
15. A method as claimed i any of claims 12 -14, characterized m adding the antioxidant in an amount of at least 0.15 wt as calculated on the weight of the oxidized lipid.
PCT/SE2012/050926 2012-08-31 2012-08-31 Hygiene article with odour control substance and method for producing it WO2014035306A1 (en)

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PCT/SE2012/050926 WO2014035306A1 (en) 2012-08-31 2012-08-31 Hygiene article with odour control substance and method for producing it
PCT/SE2013/051018 WO2014035327A1 (en) 2012-08-31 2013-08-30 Absorbent hygiene article with odour control substance and method for producing it

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GB1282889A (en) * 1968-07-19 1972-07-26 Grillo Werke Ag Deodorant composition
US5783247A (en) * 1993-07-02 1998-07-21 Van Den Berg Foods Co., Division Of Conopco, Inc. Flavoring composition containing oxidized triglyceride fats, fatty acids, of fatty acid derivatives
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