US20030105190A1 - Latex binder for nonwoven fibers and article made therewith - Google Patents
Latex binder for nonwoven fibers and article made therewith Download PDFInfo
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- US20030105190A1 US20030105190A1 US10/207,517 US20751702A US2003105190A1 US 20030105190 A1 US20030105190 A1 US 20030105190A1 US 20751702 A US20751702 A US 20751702A US 2003105190 A1 US2003105190 A1 US 2003105190A1
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- styrene
- butadiene
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/693—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F257/00—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00
- C08F257/02—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00 on to polymers of styrene or alkyl-substituted styrenes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/02—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of acids, salts or anhydrides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/44—Preparation of metal salts or ammonium salts
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
- C08L55/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
- D04H1/587—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives characterised by the bonding agents used
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
- D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/227—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of hydrocarbons, or reaction products thereof, e.g. afterhalogenated or sulfochlorinated
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/227—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of hydrocarbons, or reaction products thereof, e.g. afterhalogenated or sulfochlorinated
- D06M15/233—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of hydrocarbons, or reaction products thereof, e.g. afterhalogenated or sulfochlorinated aromatic, e.g. styrene
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention relates to a latex that may be utilized as a binder for nonwoven applications to form a permeable sublayer of personal hygiene articles. The latex is prepared by a process including the steps of (1) polymerizing a monomer mixture comprising styrene, itaconic acid, surfactant and water soluble free radical initiator to form a seed; (2) sequentially adding equal increments of a monomer mixture of styrene, butadiene and acrylic acid to the seed under emulsion polymerization conditions to form a styrene-butadiene-acrylic acid copolymer; and then (3) neutralizing the styrene-butadiene-acrylic acid copolymer to a pH of about 4.5 to 7 to form the latex.
Description
- This application is a continuation-in-part of U.S. patent application Ser. No. 09/921,241, entitled Latex Binder For Nonwoven Fibers And Article Made Therewith, filed Aug. 2, 2001, which is a Divisional of U.S. patent application Ser. No. 09/368,555, now U.S. Pat. No. 6,337,359, entitled Latex Binder For Nonwoven Fibers And Article Made Therewith, filed Aug. 5, 1999, the disclosures of which are hereby incorporated by reference in their entirety.
- The present invention relates to a latex binder for treating nonwoven fibers and a method of forming a permeable membrane including the latex binder. More particularly, the present invention relates to a latex binder for treating nonwoven fibers to make a durable or disposable nonwoven fabric that is particularly suitable for use as a permeable sublayer of a personal hygiene article.
- A nonwoven fabric is a web or continuous sheet of fibers laid down mechanically. The fibers may be deposited in a random manner or oriented in one direction. Most widely used fibers include cellulosics and synthetics including polyamides, polyesters, polypropylene and polyethylene. The spun fibers, which may be drawn, are laid down directly onto a belt by carding, airlaying or wet-laying. The sheet is then bonded together with a latex binder and subsequently treated in an oven or a calendar to complete the bonding process.
- Commonly used lattices for nonwoven fabrics are those prepared from polymers of butadiene-styrene, butadiene-acrylonitrile, vinyl acetate, acrylic monomers such as methyl acrylate, ethyl acrylate, methyl methacrylate and the like. It will be appreciated that to be useful as a nonwoven fabric in many applications, such as a permeable sublayer of a personal hygiene article, the latex binder should possess several desired physical properties. The desired physical properties include adequate tensile strength, a high modulus or stiffness under certain conditions, and good textile qualities such as tenacity, handle and the like.
- It is an object of the present invention to provide a nonwoven fabric having a high modulus. It is another object of the present invention to provide a nonwoven fabric having desired physical properties. Yet another object of the present invention is to provide a nonwoven fabric of chemically bonded fibers that is simple and economical to manufacture.
- Briefly, the present invention relates to a latex that is particularly suitable for utilization as a binder for nonwoven applications. The latex is prepared by a process including the steps of:
- (1) polymerizing a monomer mixture comprising styrene, itaconic acid, surfactant and water soluble free radical initiator to form a seed;
- (2) adding a monomer mixture of styrene, butadiene and chain transfer agent and reacting the mixture to 40-95% conversion and preferably 80-95% conversion;
- (3) sequentially adding equal increments of a monomer mixture of styrene, butadiene, acrylic acid and optionally other functional monomers, in the presence of a chain transfer agent to (2) under emulsion polymerization conditions to more than 99% conversion; and then
- (4) neutralizing the copolymer from (3) to a pH of about 4.5 to 7 to form the latex.
- The latex is particularly suitable to treat nonwoven fibers to form a permeable sublayer for use in both durable or disposable nonwovens. In a preferred embodiment, the permeable sublayer is typically interposed between a topsheet layer and a backsheet layer typically used to form a personal hygiene article.
- The present invention relates to a latex suitable for utilization as a binder to chemically bond fibers and form a nonwoven fabric. The nonwoven fabric is particularly suitable for use as a permeable sublayer of a durable or disposable nonwoven. In a preferred embodiment, the permaeable sublayer may be used as a personal hygiene article of a type well known in the art. Examples of personal hygiene articles include diapers, feminine hygiene articles and the like.
- The permeable sublayer is a web or mat comprised of randomly arranged nonwoven fibers having an open structure and high loft. The web may be formed by carding when the fibers are of such a character, by virtue of their length and flexibility, as to be capable of carding. During carding the crimped fibers are placed on a moving support and then treated with a latex binder as described herein.
- The fibers may include natural textile fibers such as jute, sisal, ramie, hemp, and cotton as well as many artificial organic textile fibers or filaments including rayon, those of cellulose esters such as cellulose acetate, vinyl resin fibers such as those of polyvinyl chloride, copolymers of vinyl chloride with vinyl acetate, vinylidene chloride or acrylonitrile, copolymers of acrylonitrile with vinyl chloride, vinyl acetate, methacrylonitrile, vinyl pyridine, polymers and copolymers of olefins such as ethylene and propylene, also condensation polymers such as polyamides or nylon types, polyesters such as ethylene glycol terephthalate polymers and the like.
- The fibers may be of one composition or mixtures of fibers in a given web. The preferred fibers include polyolefins, especially polyesters, poly(ethylene terephthalate), and acrylics, polyamides, polypropylene. The polyolefin fibers include polypropylene, polyethylene, polybutene and their copolymers. The polyester fibers include any long chain synthetic polymer composed of at least 85% by weight of an ester of a dihydric alcohol and terephthalic acid such as polyethylene terephthalate, and, in addition liquid crystal polyesters, thermotropic polyesters and the like. The acrylic fibers include any fiber forming substance containing a long chain synthetic polymer composed of at least 85% by weight acrylonitrile units —CH2 CH(CN)—. It will be appreciated that other types of fibers may also be employed in accordance with the teachings of the present invention. For example, high modulus fibers more commonly known as graphite fibers made from rayon, polyacrylonitrile or petroleum pitch may also be used.
- The fibers may be of most any suitable size and randomly arranged to most any suitable thickness depending upon the desired end use of the nonwoven fabric. The fibers are typically of a length of about 0.25 to 2 inches and typically about 1.2-15 denier. The fibers may be laid in an overlapping, intersecting random arrangement to a thickness of about 0.25 inches or less to form a mat of fibers. The fibers may be arranged by most any convenient known manner such as by wet laying, air-laying or carding.
- The fabric of the present invention is made by forming a mat of randomly arranged fibers. After the fibers are randomly arranged as desired, a latex binder is applied to the fibers. The latex binder is applied in an effective amount which will result in the fabric having sufficient strength and cohesiveness for the intended end use application. As well known in the art, the latex binder may be applied to the layer of randomly arranged fibers in a spaced, intermittent pattern of binder sites, or uniformly applied throughout the layer of fibers. It will be further appreciated that the exact amount of the latex binder employed depends, in part, upon factors such as the type of fiber, weight of fibrous layer, nature of latex binder and the like. For example, end uses which require a stronger fabric may utilize more binder. A typical content of latex binder applied on a fiber mat is about 15-40 wt %. It is preferred that the minimum amount of latex binder be applied to obtain the desired required physical properties of the nonwoven fabric such as tensile, hand and the like as well known in the art.
- The latex is then cured using methods well known in the art such as by application of heat or radiation. The term “cured” refers to the latex being cross-linked to increase the tensile strength properties. The curing of the treated fibers is affected at a temperature above the glass transition temperature of the binder.
- To obtain a sufficient thickness for the end use intended a plurality of webs may also be superimposed upon one another to achieve a sufficient thickness. The webs may be superimposed by alternating layers of carded webs disposed with their fiber orientation directions disposed at angles such as 60 degrees or 90 degrees with respect to intervening layers.
- The latex binder utilized in accordance with the present invention may be prepared by well-known conventional emulsion polymerization techniques using one or more ethylenically unsaturated monomers and a polymeric surfactant as herein disclosed and additional conventional additives such as free-radical initiators, optional chain transfer agents, chelating agents and the like can be utilized as set forth in U.S. Pat. No. 5,166,259 to Schmeing and White.
- In accordance with a preferred embodiment of the present invention, the latex is prepared by polymerizing a monomer mixture comprising styrene, itaconic acid, surfactant and a water soluble free radical initiator to form a seed.
- A monomer mixture comprising styrene, butadiene and chain transfer agent is then added to the seed and reacted to 40-95% conversion. In a preferred embodiment, the mixture is reacted to 80-95% conversion.
- A monomer mixture including styrene, butadiene, acrylic acid and optionally other functional monomers and chain transfer agent are added incrementally in stages to the mixture to form a copolymer. If necessary, additional surfactant, water and or persulfate initiators may be added between increments. The acrylic acid and optional other functional monomers are added to functionalize the polymer with acid and/or hydroxyl functional materials.
- The optional functional monomers include hydroxyethylacrylate, acrylamide, methacrylic acid, and N-methylolacrylamide and mixture thereof. In preferred embodiment, the functional monomers are between 0-10 wt % and preferably 0.1-5 wt %.
- In a preferred embodiment, the monomer mixture includes about 20-80 wt % styrene and 20-80 wt % butadiene of the total composition. The monomer mixture also includes at least about 2.0 wt % itaconic acid of the total composition, and acrylic acid in an amount of about 0.25-6 wt %, preferably 2-4 wt %.
- A surfactant is added to the monomer mixture in an amount of about 0.05-2.0 wt %. The surfactant may be most any suitable emulsifier, soap, or the like well known in the art and suitable at the pH of the latex in accordance with the present invention. Examples of suitable emulsifiers and surfactants include alkyl sulfates, alkyl sulfosuccinates, alkyl aryl sulfonates, alpha-olefin sulfonates, fatty or rosin acid salts, only or octyl phenol reaction products of ethylene oxide and the like. Other surfactants that may be used include those identified in Surface Active Agents, Schwartz and Berry, Vol. 1, Interscience Publishers, Inc., New York, 1958; Surface Activity, Moilet, Collie and Black, D. Van Nostrand Company, Inc., New York, 1961; Organic Chemistry, Feiser and Feiser, D.C. Heath and Company, Boston, 1944; and The Merck Index, Seventh Edition, Merck & Co., Inc., Rahway, N.J., 1960, all of which are hereby incorporated by reference.
- The copolymer is then neutralized to a pH of about 4.5 to 7.0 to form the latex. The pH of the latex is neutralized by addition of a base. Examples of a suitable base include potassium hydroxide, sodium bicarbonate, ammonium hydroxide, sodium hydroxide and the like. The amount of base added to the latex is adjusted to obtain the desired pH range as is well known in the art.
- Polymerization is typically carried out from about 120 degrees Fahrenheit to 185 degrees Fahrenheit. Polymerization is generally conducted for about 4 to 24 hours, however polymerization conditions may vary as desired to provide different conversion levels of monomer to copolymer. The final monomer mixture is allowed to react until substantially constant solids at which time at least 99% of the monomers have been converted.
- The invention will be further clarified by a consideration of the following example, which is intended to be purely exemplary of the invention.
- Initially, a charge of deionized water, styrene and itaconic acid, and water soluble free radical initiator were added to a reactor having a volume of about 20 gallons and having a capacity to hold about 140 lb. of latex. The reactor was then evacuated with a vacuum (about 20 inches of mercury), purged with nitrogen and heated to a temperature between 120-180 degrees Fahrenheit. This initial charge is allowed to react to a desired conversion of between 50-99% of the total amount of reactive monomers present. A charge comprising styrene, butadiene and chain transfer agent, preferably Sulfole 120, was then added to the reactor. The charge is reacted to a conversion level of between 50-95% conversion
- Subsequent charges of styrene, Sulfole 120, acrylic acid and butadiene were then charged to the reactor sequentially and reacted to the desired conversion level The first increment was added approximately 10-30 minutes after the reaction initiation takes place. Additional increments were then added to the reactor at staged intervals of about 15 or 20 minutes or as dictated by % conversion The increments may be added over most any suitable number of staged intervals depending upon the amount of latex binder to be polymerized. For example, the increments may be added from 6 stages up to 12 or more stages. After the last increment was added to the reactor the reaction was monitored until the solids level of the latex in the reactor indicated an acceptable conversion level. Post reaction treatments include steam stripping with vacuum to remove excess un reacted monomers and nonreactable VOCs. Post reaction addition as of initiators may be added to further reduced the amount of unreacted monomer.
- The resulting latex binder was then applied to polyester fibers. After applying the latex binder to the nonwoven fibers the latex binder was oven dried at 212 degrees Fahrenheit to bond the fibers and then cured at 300 degrees Fahrenheit for 1 minute to form a dimensionally stable nonwoven fabric.
- Representative physical properties of the styrene-butadiene latex binder are shown in Table 1. As shown in Table 1, the fibers had a higher hand value and higher dry tensile properties as compared to polyester fibers treated with GenFlo 3060. GenFlo 3060 is a styrene butadiene rubber latex commercially available from OMNOVA Solutions Inc.
TABLE 1 GenFlo 3060 Latex Latex content (%) 39.5 39.9 Yellow Index −7.6 −7.7 Hand Value 44.3 68.8 Cross Direction, dry Tensile (grams) 323 503 Elongation (%) 27 17 TEA 199 206 Cross Direction, wet Tensile (grams) 162 141 Elongation (%) 39 4 TEA 79 10 - All of the reported performance properties were determined after conditioning the fibers for about 24 hours at TAPPI (Technical Association of the Pulp and Paper Industry) Standard Conditions of approximately 72 degrees Fahrenheit and about 50% relative humidity. The tensile values, both dry and wet, were determined in accordance with ASTM D 1117-80 entitled “Standard Methods of Testing Nonwoven Fabrics” published in the 1980 Annual Book of ASTM Standards. Following the ASTM standard test method, dry tensile measurements were determined by using 1 inch wide and 4 inch long strips of fabric pulled at a rate of 5 inches per minute at an initial jaw separation of about 3 inches on an Instron. The wet tensile measurements were determined in substantially the same manner as the dry tensile measurements except the fabric strip was soaked in water solution for about 30 seconds prior to testing on the Instron. The Hand Values are a quantitative measure of the fabric as well known in the textile industry. The Hand Values reported are an average value of the readings determined on a Thwing Albert Handle-O-Meter by using a 5 inch square piece of the fabric. The fabric was tested on the Handle-O-Meter in both the Machine and Cross machine directions.
- The patents and documents referred to herein are hereby incorporated by reference.
- Having described presently preferred embodiments of the present invention, it is to be understood that it may be otherwise embodied within the scope of the appended claims.
Claims (18)
1. A latex which is particularly beneficial for utilization as a binder for nonwoven applications made by the process which comprises the steps of:
(1) polymerizing a monomer mixture comprising styrene, itaconic acid, surfactant and water soluble free radical initiator to form a seed;
(2) adding a monomer mixture of styrene, butadiene and chain transfer agent and reacting the mixture to between 40-95% conversion;
(3) sequentially adding equal increments of a monomer mixture of styrene, butadiene, acrylic acid and optional functional monomers, in the presence of a chain transfer agent to (2) under emulsion polymerization conditions and reacting to more than 99% conversion; and then
(4) neutralizing the copolymer from (3) to a pH of about 4.5 to 7 to form the latex.
2. The latex of claim 1 wherein the monomer mixture includes about 20-80 wt % styrene.
3. The latex of claim 1 wherein the monomer mixture also includes about 0.5-2.5 wt % itaconic acid, about 20-80 wt % butadiene and about 6-10 wt % acrylic acid.
4. The latex of claim 3 wherein the monomer mixture includes 8 wt %. acrylic acid.
5. The latex of claim 3 wherein the monomer mixture includes 2 wt % itaconic acid.
6. The latex of claim 1 wherein the monomer mixture includes about 0.05-2.0 wt % surfactant.
7. The latex of claim 1 wherein the copolymer is neutralized by addition of a base selected from potassium hydroxide, sodium bicarbonate, and ammonium hydroxide, sodium hydroxide.
8. A method for making a composite useful as a personal hygiene article which comprises:
(1) treating a nonwoven fabric with a latex binder to form a permeable sublayer, the latex prepared by a process which comprises the steps of:
(a) polymerizing a monomer mixture comprising styrene, itaconic acid, surfactant and water soluble free radical initiator to form a seed;
(b) adding a monomer mixture of styrene, butadiene and chain transfer agent and reacting the mixture to between 40-95% conversion;
(c) sequentially adding equal increments of a monomer mixture of styrene, butadiene, acrylic acid and optional functional monomers, in the presence of a chain transfer agent to (b) under emulsion polymerization conditions and reacting to more than 99% conversion; and then
(d) neutralizing the copolymer from (c) to a pH of about 4.5 to 7 to form the latex;
(2) providing at least one fluid permeable top sheet layer and at least one substantially fluid impermeable backsheet layer; and
(3) interposing the sublayer material between the topsheet layer and backsheet layer.
9. The method of claim 8 wherein the permeable sublayer of the personal hygiene article is a web comprised of randomly arranged nonwoven fibers having an open structure and high loft.
10. The method of claim 9 wherein the web is formed by carding.
11. The method of claim 9 wherein the fibers are selected from natural textile fibers, artificial organic textile fibers, vinyl resin fibers and mixtures thereof.
12. The method of claim 9 wherein the fibers are selected from polyolefins, polyesters, acrylics, and polyamides.
13. The method of claim 12 wherein the polyolefin fibers include polypropylene, polyethylene, polybutene and their copolymers.
14. The method of claim 12 wherein the polyester fibers include any long synthetic polymer composed of at least 85% by weight of an ester of a dihydric alcohol and terephthalic acid.
15. The method of claim 12 wherein the acrylic fibers include any fiber forming substance containing a long chain synthetic polymer composed of at least 85% by weight acrylonitrile units —CH2 CH(CN)—.
16. The method of claim 9 wherein the fibers are graphite fibers.
17. The method of claim 9 wherein the fibers are of a length of about 0.25 to 2 inches and about 1.2-15 denier.
18. The method of claim 8 wherein the latex binder is applied on the fiber mat is about 15-40 wt %.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/207,517 US20030105190A1 (en) | 1999-08-05 | 2002-07-29 | Latex binder for nonwoven fibers and article made therewith |
US10/854,690 US6987153B2 (en) | 1999-08-05 | 2004-05-26 | Latex binder for nonwoven fibers and article made therewith |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/368,555 US6337359B1 (en) | 1999-08-05 | 1999-08-05 | Latex binder for nonwoven fibers and article made therewith |
US09/921,241 US6425978B1 (en) | 1999-08-05 | 2001-08-02 | Latex binder for nonwoven fibers and article made therewith |
US10/207,517 US20030105190A1 (en) | 1999-08-05 | 2002-07-29 | Latex binder for nonwoven fibers and article made therewith |
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US6987153B2 (en) | 2006-01-17 |
US20050043441A1 (en) | 2005-02-24 |
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