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US20030008591A1 - Water dispersible, salt sensitive nonwoven materials - Google Patents

Water dispersible, salt sensitive nonwoven materials Download PDF

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Publication number
US20030008591A1
US20030008591A1 US09/883,520 US88352001A US2003008591A1 US 20030008591 A1 US20030008591 A1 US 20030008591A1 US 88352001 A US88352001 A US 88352001A US 2003008591 A1 US2003008591 A1 US 2003008591A1
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United States
Prior art keywords
percent
weight
woven material
water
woven
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US09/883,520
Inventor
John Parsons
Steven Pauls
Michael Eknoian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Celanese International Corp
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US09/883,520 priority Critical patent/US20030008591A1/en
Assigned to NATIONAL STARCH AND CHEMICAL INVESTMENT HOLDING CORPORATION reassignment NATIONAL STARCH AND CHEMICAL INVESTMENT HOLDING CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EKNOIAN, MICHAEL, PARSONS, JOHN C., PAULS, STEVEN P., SR.
Priority to GB0213004A priority patent/GB2376695B/en
Publication of US20030008591A1 publication Critical patent/US20030008591A1/en
Assigned to CELANESE INTERNATIONAL CORPORATION reassignment CELANESE INTERNATIONAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NATIONAL STARCH & CHEMICAL INVESTMENT HOLDING CORPORATION
Assigned to DEUTSCHE BANK AG, NEW YORK BRANCH, AS COLLATERAL AGENT reassignment DEUTSCHE BANK AG, NEW YORK BRANCH, AS COLLATERAL AGENT ASSIGNMENT OF SECURITY INTEREST IN CERTAIN PATENTS Assignors: CELANESE INTERNATIONAL CORPORATION
Abandoned legal-status Critical Current

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Classifications

    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D21H21/20—Wet strength agents
    • 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
    • A61L15/62—Compostable, hydrosoluble or hydrodegradable materials
    • 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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K10/00—Body-drying implements; Toilet paper; Holders therefor
    • A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
    • A47K10/32—Dispensers for paper towels or toilet paper
    • A47K2010/3266—Wet wipes
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/696—Including strand or fiber material which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous compositions, water solubility, heat shrinkability, etc.]

Definitions

  • This invention relates to non-woven materials containing an emulsion binder, and which are water dispersible, yet non-dispersible in aqueous solution containing 0.5 percent or more of an inorganic salt.
  • the non-woven materials can be used to produce non-woven articles, which can be disposed of by flushing down a toilet, and break down into smaller pieces within the wastewater stream.
  • Non-woven fibrous webs have long been used to produce disposable articles, such as garments, wipes, diapers and hygiene articles.
  • U.S. Pat. No. 5,629,081 discloses pre-moistened, dispersible, biodegradable wet wipes containing a binder containing polyvinyl alcohol, or a polyvinyl alcohol stabilized emulsion.
  • U.S. Pat. Nos. 5,509,913 and 6,127,593 disclose flushable fibrous articles with solubility related to salt concentration.
  • U.S. Pat. No. 5,935,880 discloses dispersible non-woven fabric and a method for making the fabric. The binder dissolves in water at less than 50 parts per million (ppm) of divalent ions, allowing for the non-woven material to be broken and dispersed in water.
  • the present invention is directed to a non-woven material comprising
  • an aqueous emulsion binder comprising a water-dispersible polymer which is non-dispersible in aqueous solutions containing 0.5 weight percent or more of an inorganic salt, wherein said water-dispersible polymer comprises from 1 to 100 percent by weight of a hydrophilic monomer and from 0 to 99 percent by weight of at least one non-hydrophilic monomer, wherein a film formed from said polymer has a Tg of from ⁇ 40 to +105° C.
  • the present invention is also directed to a non-woven article made of the novel non-woven material.
  • the present invention relates to non-woven materials, formed with emulsion binders, that are water dispersible, yet non-dispersible in aqueous solution containing 0.5 percent or more of an inorganic salt.
  • a non-woven material refers to materials formed from loosely assembled webs of fibers, which are bound together by a polymer.
  • the binder plays an important role in the properties of the non-woven material such as strength and feel.
  • Fibers from any source and of any suitable length may be used in the present invention.
  • the fibers preferably will be less than a maximum of 5 cm long and most preferably less than 2 cm long.
  • Fibers include those known in the art including fibers from woody plants such as deciduous and coniferous trees; non-woody plants, such as cotton, flax, esparto grass, milkweed, straw, jute and bagasse; and synthetic fibers, such as polyester, polypropylene, and rayon.
  • Other fiber materials used in the art, and mixtures of any fibers can be used in the present invention.
  • Preferred fibers are those typically used in air-laid non-wovens, especially wood pulp fibers having a length of less than 0.5 cm.
  • Fibers provide good biodegradable breakdown. Fibers are present in the non-woven material at from 50 to 98 percent by weight, depending on the end use of the non-woven material. For many uses, fibers make up about 70 to 85 percent by weight of the non-woven material.
  • the binder is an emulsion polymer, which is salt sensitive.
  • Salt sensitive emulsion polymers are polymers which are formed by an emulsion polymerization process, and which form films that are dispersible in tap water, yet are non-dispersible in water containing at least 0.5 percent by weight of an inorganic monovalent, divalent, or trivalent salt, or mixtures thereof.
  • the films formed may be continuous or non-continuous.
  • the polymer is dispersible, rather than soluble, in water.
  • Dispersible as used herein, means that in tap water, a film formed from the polymer breaks into small discrete pieces or particles that can be filtered out. These pieces are capable of being separated from the water. While not being bound to a theory, it is believed that the dispersion of the polymer film is related to the fact that a film forms from an emulsion by coalescence of polymer particles, forming weak bonds between particles. In water, some bonds between the particles will break, resulting in clusters of polymer particles. This is different from a solution polymer in which polymer chains mix and entangle during film formation, and this film dissolves into individual polymer chains, which cannot be filtered.
  • salt-sensitive emulsion polymers useful in the present invention are described in U.S. patent application Ser. No. 09/823,318, incorporated herein by reference.
  • the emulsion polymers of the present invention consist of a polymer, which is stabilized by a hydrophilic polymeric colloid.
  • the polymer itself is not salt sensitive.
  • the colloid may or may not be salt sensitive.
  • the colloid-stabilized polymer particle is salt sensitive.
  • the polymer colloid contains at least one monomer, and ideally two or more monomers. At least one of the monomers is a hydrophilic monomer.
  • the hydrophilic monomer may be an acidic monomer containing a carboxylic acid, a dicarboxylic acid, a sulfonic acid, or a phosphonic acid group, or a mixture thereof.
  • carboxylic acid monomers include, but are not limited to, acrylic acid, methacrylic acid, maleic acid, maleic acid half esters, maleic anhydride, itaconic acid, and crotonic acid.
  • Preferred carboxylic acids include acrylic acid and methacrylic acid.
  • Sulfonic acid monomers include, but are not limited to styrene sulfonic acid, 2-acrylamido-2-methyl-1-propanesulfonic acid, vinylsulfonic acid, and the salts of these acids.
  • Examples of monomers containing a phosphonic acid group include, but are not limited to styrene phosphonic acid, sodium vinyl phosphonate, vinylphosphoric acid, and CH 2 ⁇ C(CH 3 )COO(CH 2 ) n OPO 3 H, where n is from 2 to 4.
  • a preferred phosphoric acid monomer is vinyl phosphonic acid.
  • Other hydrophilic monomers include, but are not limited to those containing a hydroxyl group, acrylamides and methacrylamides.
  • the polymer colloid may also contain at least one other ethylenically unsaturated monomer.
  • monomers useful in the present invention include, but are not limited to, (meth)acrylates, maleates, (meth)acrylamides, vinyl esters, itaconates, styrenics, unsaturated hydrocarbons, acrylonitrile, nitrogen functional monomers, vinyl esters, alcohol functional monomers.
  • the hydrophilic monomer(s) is present in the polymer colloid at from 1 to 100 percent by weight.
  • Other ethylenically unsaturated monomers may be present at from 0 to 99 percent by weight.
  • the hydrophilic monomer is present in the polymer colloid at from 10 to 100 percent and most preferably from 30 to 99.
  • a graft-linker and/or crosslinker can be incorporated into the polymer colloid.
  • graft-linkers and/or crosslinkers useful in the present invention include, but are not limited to, diallyl phthalate diallyl amine, allyl methacrylate, ethylene glycol diacrylate, 1,6-hexane diacrylate, methylene bisacrylamide, divinyl benzene, triallyl amine, triallyl cyanurate, and trimethylolpropane triacrylate.
  • the polymer colloid may be used to stabilize a latex polymer.
  • the colloid itself can be either salt sensitive or non-salt sensitive.
  • the colloid can either be added to the polymerization process separately, or be formed in situ
  • colloids that are salt sensitive include, but are not limited to, poly(acrylic acid), poly(methacrylic acid), and copolymers thereof.
  • colloids that are not salt sensitive include, but are not limited to, the salts of poly(2-acrylamido-2-methyl-1-propanesulfonic) acid, the salts of polyphosphonic acid, and polyols.
  • the colloid is present in the latex polymer at from 0.1 to 100 percent by weight based on polymer solids, more preferably 1 to 75 weight percent, and most preferably from 3-75 weight percent.
  • the latex polymers useful in the present invention have a Tg of from ⁇ 40 to +105° C.
  • the process for producing salt sensitive emulsions of the invention involves the formation of a colloid stabilizer, followed by an emulsion polymerization using said stabilizer by means known in the art.
  • the stabilizer may either be formed in situ, or added separately.
  • a useful process for producing the salt sensitive emulsions is found in U.S. patent application Ser. No. 09/540,033, incorporated herein by reference.
  • the emulsion polymerization may be a batch, semi-batch, or continuous process.
  • One preferred process involves an in situ colloid process in which a polymer seed is polymerized from one or more monomers selected from unsaturated acidic monomers, alkyl(meth)acrylates and vinyl monomers which are neutralized to between 1 and 100 percent with base to form a stabilizer. Using this stabilizer, monomers are added and polymerized by means known in the art of emulsion polymers.
  • Another preferred process involves the use of a hydrophilic polymer colloid, as described above as a stabilizer in the synthesis of an ethylene-vinyl acetate copolymer, where the level of ethylene in the copolymer is at least 55 percent by weight of the polymer.
  • the binder may be formulated with other components known in the art in conventional amounts, prior to being applied to the fiber web.
  • the other components may include, but are not limited to, plasticizers, tackifiers, fillers, humectants, surfactants, salts, fragrances, pigments, titanium dioxide, and encapsulated components.
  • the emulsion binder is present at from 25 to 100 weight percent based on all the components, and preferably at from 50 to 100 percent.
  • Water may also be added to the binder formulation to adjust the solids level and viscosity required for application to the fiber web.
  • the binder formulation is applied at a solids level of from 2 to 60 percent, preferably from 5 to 40 percent and most preferably from 10 to 25 percent.
  • the non-woven material will generally have an add-on value of from 2 to 50 percent by weight, preferably from 15 to 30 percent by weight.
  • Non-woven materials of the present invention have a wet tensile strength of at least 100 g/in in an aqueous solution containing three percent or greater of an inorganic salt, preferably sodium chloride.
  • the materials have a wet tensile strength of at least 40 g/in, and preferably at least 60 g/in in tap water.
  • Tap water refers to refers to water as sourced to commercial and residential properties. Tap water generally has a hardness level of from 50 to 300.
  • wet tensile strength as used herein is measured by the TAPPI UM 656 procedure.
  • the non-woven material was soaked in 3 percent sodium chloride solution for 24 hours, and in hard water for 5 minutes.
  • the non-woven is formed by any process known in the art, such as, but not limited to airlaid, wetlaid, drylaid, carded fiber.
  • the fiber web formed has a basis weight of from 20-200 grams per square meter (gsm).
  • the binder is applied to the non-woven fibers by means known in the art such as, printing, spraying with and without air, saturation, creping, and foam-application.
  • pre-moistened products produced with the non-woven material of the present invention may also contain a lotion.
  • the lotion contains one or more additives, which include, but are not limited to, sodium chloride solution, preservatives, boric acid, bicarbonates, moisturizers, emollients, surfactants, humectants, alcohols, water, and fragrances.
  • the lotion must contain at least 0.5 percent by weight of an inorganic salt to maintain the integrity of the binder.
  • the lotion is present at up to 500 percentage by weight based on the weight of the non-woven material, and preferably up to 250 percent.
  • the lotion is generally added as a secondary treatment of the non-woven that has been prepared with the salt-sensitive binder and then converted for use.
  • This wet solution treatment can occur just prior to packaging, or after the non-woven has been placed
  • Wet-use products have a stable wet strength of measurable tensile value and integrity, yet disperse when placed in tap water, allowing the product to be flushed in sewer or septic systems without blockage. In water, dispersion of the non-woven begins immediately. The rate of dispersion can be tailored for different applications.
  • Dry products formed with the non-woven material of the present invention may also contain up to 50 percent by weight, and preferably up to 30 percent by weight, of other ingredient including, but not limited to, perfumes, plasticizers, colorants, antifoams, bactericides, bacteriostats, thickeners, and fillers.
  • Non-woven materials of the present invention are used to form a variety of both dry and moist finished products. These products include, but are not limited to wet products such as personal cleansing wipes for personal hygiene uses such as bathroom, facial, and make-up removal; and dry products such as diaper and adult incontinence top sheets, back sheets, acquisition layers and absorbent core; feminine hygiene products; industrial towels/wipes for aqueous and solvent use; surgical gowns and towels.
  • wet products such as personal cleansing wipes for personal hygiene uses such as bathroom, facial, and make-up removal
  • dry products such as diaper and adult incontinence top sheets, back sheets, acquisition layers and absorbent core
  • feminine hygiene products such as industrial towels/wipes for aqueous and solvent use
  • surgical gowns and towels such as surgical gowns and towels.
  • One key attribute of the non-woven materials of the present invention is their ability to retain insult durability in use, then disperse during flushing in water.
  • a 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 12% solids formulation of salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 15%.
  • the wet web was drum dried at 210° F.
  • the web was subsequently heated for 5 minutes at 266° F. in a forced-air oven. After conditioning, the web was tested for its tensile strength in 3% NaCl and then in tap water for 5 minutes after soaking in the 3% NaCl for 4 days, 10 days, and 22 days.
  • Tensiles were pulled using the TAPPI UM 656 procedure. Following is the data that was generated.
  • Tensile, g/in 3% NaCl ⁇ 5 min soak in Age 3% NaCl tap water 4 days 135 44 10 days 101 45 22 days 100 45
  • Whatman #4 Chromatography Paper was pad saturated with a 15% solids formulation of salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 15%.
  • the wet web was drum dried at 210° F.
  • the web was subsequently heated for 5 minutes at 266° F.
  • the web was tested for its tensile strength in DI water, and 1%, 3%, and 5% NaCl solutions.
  • a non-crosslinking VA/BA polymer was used as a reference.
  • Tensile strength was measured using the TAPPI UM 656 procedure. Following is the data that was generated to demonstrate the effect of ionic strength on tensile strength of the non-woven.
  • a 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 15% solids formulation of surfactant stabilized salt-sensitive emulsion polymer of MAA/MMA/BA in a weight ratio of 60/15/25 to a dry add-on of 20%.
  • the wet web was drum dried at 210° F.
  • the web was subsequently heated for 5 minutes at 266° F.
  • After conditioning, the web was tested for its tensile strength in 3% NaCl, 3% CaCl 2 , and 3% MgCl 2 .
  • the web was also tested for its strength in tap water. Tensiles were pulled using the TAPPI UM 656 procedure.
  • a 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of surfactant stabilized salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%.
  • the wet web was drum dried at 210° F.
  • the web was subsequently heated for 5 minutes at 300° F.
  • the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days.
  • the web was also tested in for its strength in de-ionized water.
  • a 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of surfactant stabilized salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%.
  • the wet web was drum dried at 210° F.
  • the web was subsequently heated for 2 minutes at 250° F.
  • the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days.
  • the web was also tested in for its strength in de-ionized water.
  • a 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of surfactant stabilized salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%.
  • the wet web was drum dried at 210° F.
  • the web was subsequently heated for 2 minutes at 250° F.
  • the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days.
  • the web was also tested in for its strength in de-ionized water.
  • a 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%.
  • the wet web was drum dried at 210° F.
  • the web was subsequently heated for 2 minutes at 250° F.
  • the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days.
  • the web was also tested in for its strength in de-ionized water.
  • a 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%.
  • the wet web was drum dried at 210° F.
  • the web was subsequently heated for 5 minutes at 300° F.
  • After conditioning, the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days.
  • the web was also tested in for its strength in de-ionized water.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Chemical & Material Sciences (AREA)
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  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
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  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The present invention is directed to a non-woven material having an emulsion binder, which is dispersible in water, yet non-dispersible in aqueous solutions containing 0.5 weight percent or more of an inorganic salt. The water-dispersible polymer comprises from 1 to 100 percent by weight of a hydrophilic monomer and from 0 to 99 percent by weight of at least one non-hydrophilic monomer, wherein a film formed from said polymer has a Tg of from −40 to 105° C. The dispersible non-woven material is useful in forming disposable articles which can be disposed of by flushing down a toilet.

Description

    FIELD OF THE INVENTION
  • This invention relates to non-woven materials containing an emulsion binder, and which are water dispersible, yet non-dispersible in aqueous solution containing 0.5 percent or more of an inorganic salt. The non-woven materials can be used to produce non-woven articles, which can be disposed of by flushing down a toilet, and break down into smaller pieces within the wastewater stream. [0001]
    • BACKGROUND OF THE INVENTION
  • Non-woven fibrous webs have long been used to produce disposable articles, such as garments, wipes, diapers and hygiene articles. [0002]
  • U.S. Pat. No. 5,629,081 discloses pre-moistened, dispersible, biodegradable wet wipes containing a binder containing polyvinyl alcohol, or a polyvinyl alcohol stabilized emulsion. [0003]
  • It is convenient, and environmentally friendly to have a non-woven article, which can be disposed of by flushing down a toilet bowl. U.S. Pat. Nos. 5,509,913 and 6,127,593 disclose flushable fibrous articles with solubility related to salt concentration. U.S. Pat. No. 5,935,880 discloses dispersible non-woven fabric and a method for making the fabric. The binder dissolves in water at less than 50 parts per million (ppm) of divalent ions, allowing for the non-woven material to be broken and dispersed in water. [0004]
  • U.S. patent applications Ser. Nos. 09/540,033 and 09/823,318 describe salt sensitive aqueous emulsions which form films that are water-dispersible, yet non-dispersible in aqueous solutions containing 0.5 percent or more of an inorganic salt. [0005]
  • There is a need for a non-woven material formed with a salt-sensitive emulsion binder. Surprisingly, a salt-sensitive emulsion binder has been found which can be used to produce non-woven articles, where both the binder and the fibrous web are water-dispersible. [0006]
    • SUMMARY OF THE INVENTION
  • The present invention is directed to a non-woven material comprising [0007]
  • a) a web of fibers; and [0008]
  • b) an aqueous emulsion binder comprising a water-dispersible polymer which is non-dispersible in aqueous solutions containing 0.5 weight percent or more of an inorganic salt, wherein said water-dispersible polymer comprises from 1 to 100 percent by weight of a hydrophilic monomer and from 0 to 99 percent by weight of at least one non-hydrophilic monomer, wherein a film formed from said polymer has a Tg of from −40 to +105° C. [0009]
  • The present invention is also directed to a non-woven article made of the novel non-woven material. [0010]
    • DETAILED DESCRIPTION OF THE INVENTION
  • The present invention relates to non-woven materials, formed with emulsion binders, that are water dispersible, yet non-dispersible in aqueous solution containing 0.5 percent or more of an inorganic salt. [0011]
  • A non-woven material, as used herein, refers to materials formed from loosely assembled webs of fibers, which are bound together by a polymer. The binder plays an important role in the properties of the non-woven material such as strength and feel. [0012]
  • Fibers from any source and of any suitable length may be used in the present invention. To aid in dispersion, the fibers preferably will be less than a maximum of 5 cm long and most preferably less than 2 cm long. Fibers include those known in the art including fibers from woody plants such as deciduous and coniferous trees; non-woody plants, such as cotton, flax, esparto grass, milkweed, straw, jute and bagasse; and synthetic fibers, such as polyester, polypropylene, and rayon. Other fiber materials used in the art, and mixtures of any fibers can be used in the present invention. Preferred fibers are those typically used in air-laid non-wovens, especially wood pulp fibers having a length of less than 0.5 cm. Such fibers provide good biodegradable breakdown. Fibers are present in the non-woven material at from 50 to 98 percent by weight, depending on the end use of the non-woven material. For many uses, fibers make up about 70 to 85 percent by weight of the non-woven material. [0013]
  • The binder is an emulsion polymer, which is salt sensitive. Salt sensitive emulsion polymers are polymers which are formed by an emulsion polymerization process, and which form films that are dispersible in tap water, yet are non-dispersible in water containing at least 0.5 percent by weight of an inorganic monovalent, divalent, or trivalent salt, or mixtures thereof. The films formed may be continuous or non-continuous. [0014]
  • The polymer is dispersible, rather than soluble, in water. Dispersible, as used herein, means that in tap water, a film formed from the polymer breaks into small discrete pieces or particles that can be filtered out. These pieces are capable of being separated from the water. While not being bound to a theory, it is believed that the dispersion of the polymer film is related to the fact that a film forms from an emulsion by coalescence of polymer particles, forming weak bonds between particles. In water, some bonds between the particles will break, resulting in clusters of polymer particles. This is different from a solution polymer in which polymer chains mix and entangle during film formation, and this film dissolves into individual polymer chains, which cannot be filtered. Since the polymer contains a high level of hydrophilic monomer(s), when the emulsion dries to a film, the particles are easily dispersed in water. Salt-sensitive emulsion polymers useful in the present invention are described in U.S. patent application Ser. No. 09/823,318, incorporated herein by reference. [0015]
  • The emulsion polymers of the present invention consist of a polymer, which is stabilized by a hydrophilic polymeric colloid. The polymer itself is not salt sensitive. The colloid may or may not be salt sensitive. However, the colloid-stabilized polymer particle is salt sensitive. [0016]
  • The polymer colloid contains at least one monomer, and ideally two or more monomers. At least one of the monomers is a hydrophilic monomer. [0017]
  • The hydrophilic monomer may be an acidic monomer containing a carboxylic acid, a dicarboxylic acid, a sulfonic acid, or a phosphonic acid group, or a mixture thereof. Examples of carboxylic acid monomers include, but are not limited to, acrylic acid, methacrylic acid, maleic acid, maleic acid half esters, maleic anhydride, itaconic acid, and crotonic acid. Preferred carboxylic acids include acrylic acid and methacrylic acid. Sulfonic acid monomers include, but are not limited to styrene sulfonic acid, 2-acrylamido-2-methyl-1-propanesulfonic acid, vinylsulfonic acid, and the salts of these acids. Examples of monomers containing a phosphonic acid group include, but are not limited to styrene phosphonic acid, sodium vinyl phosphonate, vinylphosphoric acid, and CH[0018] 2═C(CH3)COO(CH2)nOPO3H, where n is from 2 to 4. A preferred phosphoric acid monomer is vinyl phosphonic acid. Other hydrophilic monomers include, but are not limited to those containing a hydroxyl group, acrylamides and methacrylamides.
  • The polymer colloid may also contain at least one other ethylenically unsaturated monomer. Examples of monomers useful in the present invention include, but are not limited to, (meth)acrylates, maleates, (meth)acrylamides, vinyl esters, itaconates, styrenics, unsaturated hydrocarbons, acrylonitrile, nitrogen functional monomers, vinyl esters, alcohol functional monomers. [0019]
  • The hydrophilic monomer(s) is present in the polymer colloid at from 1 to 100 percent by weight. Other ethylenically unsaturated monomers may be present at from 0 to 99 percent by weight. Preferably the hydrophilic monomer is present in the polymer colloid at from 10 to 100 percent and most preferably from 30 to 99. [0020]
  • A graft-linker and/or crosslinker can be incorporated into the polymer colloid. Examples of graft-linkers and/or crosslinkers useful in the present invention include, but are not limited to, diallyl phthalate diallyl amine, allyl methacrylate, ethylene glycol diacrylate, 1,6-hexane diacrylate, methylene bisacrylamide, divinyl benzene, triallyl amine, triallyl cyanurate, and trimethylolpropane triacrylate. [0021]
  • The polymer colloid may be used to stabilize a latex polymer. The colloid itself can be either salt sensitive or non-salt sensitive. The colloid can either be added to the polymerization process separately, or be formed in situ [0022]
  • Examples of colloids that are salt sensitive include, but are not limited to, poly(acrylic acid), poly(methacrylic acid), and copolymers thereof. [0023]
  • Examples of colloids that are not salt sensitive include, but are not limited to, the salts of poly(2-acrylamido-2-methyl-1-propanesulfonic) acid, the salts of polyphosphonic acid, and polyols. [0024]
  • The colloid is present in the latex polymer at from 0.1 to 100 percent by weight based on polymer solids, more preferably 1 to 75 weight percent, and most preferably from 3-75 weight percent. [0025]
  • The latex polymers useful in the present invention have a Tg of from −40 to +105° C. [0026]
  • The process for producing salt sensitive emulsions of the invention involves the formation of a colloid stabilizer, followed by an emulsion polymerization using said stabilizer by means known in the art. The stabilizer may either be formed in situ, or added separately. A useful process for producing the salt sensitive emulsions is found in U.S. patent application Ser. No. 09/540,033, incorporated herein by reference. The emulsion polymerization may be a batch, semi-batch, or continuous process. [0027]
  • One preferred process involves an in situ colloid process in which a polymer seed is polymerized from one or more monomers selected from unsaturated acidic monomers, alkyl(meth)acrylates and vinyl monomers which are neutralized to between 1 and 100 percent with base to form a stabilizer. Using this stabilizer, monomers are added and polymerized by means known in the art of emulsion polymers. [0028]
  • Another preferred process involves the use of a hydrophilic polymer colloid, as described above as a stabilizer in the synthesis of an ethylene-vinyl acetate copolymer, where the level of ethylene in the copolymer is at least 55 percent by weight of the polymer. [0029]
  • The binder may be formulated with other components known in the art in conventional amounts, prior to being applied to the fiber web. The other components may include, but are not limited to, plasticizers, tackifiers, fillers, humectants, surfactants, salts, fragrances, pigments, titanium dioxide, and encapsulated components. The emulsion binder is present at from 25 to 100 weight percent based on all the components, and preferably at from 50 to 100 percent. [0030]
  • Water may also be added to the binder formulation to adjust the solids level and viscosity required for application to the fiber web. Typically the binder formulation is applied at a solids level of from 2 to 60 percent, preferably from 5 to 40 percent and most preferably from 10 to 25 percent. The non-woven material will generally have an add-on value of from 2 to 50 percent by weight, preferably from 15 to 30 percent by weight. [0031]
  • Non-woven materials of the present invention have a wet tensile strength of at least 100 g/in in an aqueous solution containing three percent or greater of an inorganic salt, preferably sodium chloride. The materials have a wet tensile strength of at least 40 g/in, and preferably at least 60 g/in in tap water. Tap water, as used herein refers to refers to water as sourced to commercial and residential properties. Tap water generally has a hardness level of from 50 to 300. [0032]
  • Wet tensile strength as used herein is measured by the TAPPI UM 656 procedure. The non-woven material was soaked in 3 percent sodium chloride solution for 24 hours, and in hard water for 5 minutes. [0033]
  • The non-woven is formed by any process known in the art, such as, but not limited to airlaid, wetlaid, drylaid, carded fiber. Preferably the fiber web formed has a basis weight of from 20-200 grams per square meter (gsm). The binder is applied to the non-woven fibers by means known in the art such as, printing, spraying with and without air, saturation, creping, and foam-application. [0034]
  • In addition to the binder, pre-moistened products produced with the non-woven material of the present invention may also contain a lotion. The lotion contains one or more additives, which include, but are not limited to, sodium chloride solution, preservatives, boric acid, bicarbonates, moisturizers, emollients, surfactants, humectants, alcohols, water, and fragrances. The lotion must contain at least 0.5 percent by weight of an inorganic salt to maintain the integrity of the binder. The lotion is present at up to 500 percentage by weight based on the weight of the non-woven material, and preferably up to 250 percent. The lotion is generally added as a secondary treatment of the non-woven that has been prepared with the salt-sensitive binder and then converted for use. This wet solution treatment can occur just prior to packaging, or after the non-woven has been placed Wet-use products have a stable wet strength of measurable tensile value and integrity, yet disperse when placed in tap water, allowing the product to be flushed in sewer or septic systems without blockage. In water, dispersion of the non-woven begins immediately. The rate of dispersion can be tailored for different applications. [0035]
  • Dry products formed with the non-woven material of the present invention may also contain up to 50 percent by weight, and preferably up to 30 percent by weight, of other ingredient including, but not limited to, perfumes, plasticizers, colorants, antifoams, bactericides, bacteriostats, thickeners, and fillers. [0036]
  • Non-woven materials of the present invention are used to form a variety of both dry and moist finished products. These products include, but are not limited to wet products such as personal cleansing wipes for personal hygiene uses such as bathroom, facial, and make-up removal; and dry products such as diaper and adult incontinence top sheets, back sheets, acquisition layers and absorbent core; feminine hygiene products; industrial towels/wipes for aqueous and solvent use; surgical gowns and towels. [0037]
  • One key attribute of the non-woven materials of the present invention is their ability to retain insult durability in use, then disperse during flushing in water. [0038]
  • The following examples are presented to further illustrate and explain the present invention and should not be taken as limiting in any regard.[0039]
    • EXAMPLE 1
  • A 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 12% solids formulation of salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 15%. The wet web was drum dried at 210° F. The web was subsequently heated for 5 minutes at 266° F. in a forced-air oven. After conditioning, the web was tested for its tensile strength in 3% NaCl and then in tap water for 5 minutes after soaking in the 3% NaCl for 4 days, 10 days, and 22 days. Tensiles were pulled using the TAPPI UM 656 procedure. Following is the data that was generated. [0040]
    Tensile, g/in
    3% NaCl→5 min soak in
    Age 3% NaCl tap water
     4 days 135 44
    10 days 101 45
    22 days 100 45
    • EXAMPLE 2
  • Whatman #4 Chromatography Paper was pad saturated with a 15% solids formulation of salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 15%. The wet web was drum dried at 210° F. The web was subsequently heated for 5 minutes at 266° F. After conditioning, the web was tested for its tensile strength in DI water, and 1%, 3%, and 5% NaCl solutions. A non-crosslinking VA/BA polymer was used as a reference. Tensile strength was measured using the TAPPI UM 656 procedure. Following is the data that was generated to demonstrate the effect of ionic strength on tensile strength of the non-woven. [0041]
    Tensiles, g/in
    0% 1% NaCl 3% NaCl 5% NaCl
    BA/VA 196 218 223 260
    MAA/AMPS/MMA/BA  80 158 323 766
    • EXAMPLE 3
  • A 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 15% solids formulation of surfactant stabilized salt-sensitive emulsion polymer of MAA/MMA/BA in a weight ratio of 60/15/25 to a dry add-on of 20%. The wet web was drum dried at 210° F. The web was subsequently heated for 5 minutes at 266° F. After conditioning, the web was tested for its tensile strength in 3% NaCl, 3% CaCl[0042] 2, and 3% MgCl2. The web was also tested for its strength in tap water. Tensiles were pulled using the TAPPI UM 656 procedure. Following is the data that was generated to demonstrate the effect of different cations on tensile strength of the non-woven:
    Tensile, g/in
    3% NaCl 3% CaCl2 3% MgCl2
    75 240 194
    Tap Water 20 88 42
    • EXAMPLE 4
  • A 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of surfactant stabilized salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%. The wet web was drum dried at 210° F. The web was subsequently heated for 5 minutes at 300° F. After conditioning, the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days. The web was also tested in for its strength in de-ionized water. Tensiles were pulled using the TAPPI UM 656 procedure. Following is the data that was generated: [0043]
    Tensile, g/in
    3% NaCl→ 5% NaCl→
    3% NaCl Hard Water 5% NaCl Hard Water DI Water
    221 224 198 118 223
    • EXAMPLE 5
  • A 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of surfactant stabilized salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%. The wet web was drum dried at 210° F. The web was subsequently heated for 2 minutes at 250° F. After conditioning, the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days. The web was also tested in for its strength in de-ionized water. Tensiles were pulled using the TAPPI UM 656 procedure. Following is the data that was generated: [0044]
    Tensile, g/in
    3% NaCl→ 5% NaCl→
    3% NaCl Hard Water 5% NaCl Hard Water DI Water
    168 127 174 145 124
    • EXAMPLE 6
  • A 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of surfactant stabilized salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%. The wet web was drum dried at 210° F. The web was subsequently heated for 2 minutes at 250° F. After conditioning, the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days. The web was also tested in for its strength in de-ionized water. Tensiles were pulled using the TAPPI UM 656 procedure. Following is the data that was generated: [0045]
    Tensile, g/in
    3% NaCl→ 5% NaCl→
    3% NaCl Hard Water 5% NaCl Hard Water DI Water
    221 224 198 118 223
    • EXAMPLE 7
  • A 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%. The wet web was drum dried at 210° F. The web was subsequently heated for 2 minutes at 250° F. After conditioning, the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days. The web was also tested in for its strength in de-ionized water. Tensiles were pulled using the TAPPI UM 656 procedure. Following is the data that was generated: [0046]
    Tensile, g/in
    3% NaCl→ 5% NaCl→
    3% NaCl Hard Water 5% NaCl Hard Water DI Water
    148 113 259 171 9
    • EXAMPLE 8
  • A 60 gsm air-laid cellulosic fiber (Weyerhauser NB416) was pad saturated with a 16% solids formulation of salt-sensitive emulsion polymer of MAA/AMPS/MMA/BA in a weight ratio of 57/5/14/24 to a dry add-on of 20%. The wet web was drum dried at 210° F. The web was subsequently heated for 5 minutes at 300° F. After conditioning, the web was tested for its tensile strength in 3% and 5% NaCl and then in hard water (625 ppm calcium carbonate) for 5 minutes after soaking in the 5% NaCl for 7 days. The web was also tested in for its strength in de-ionized water. Tensiles were pulled using the TAPPI UM 656 procedure. Following is the data that was generated: [0047]
    Tensile, gf
    3% NaCl→ 5% NaCl→
    3% NaCl Hard Water 5% NaCl Hard Water DI Water
    356 239 444 295 97

Claims (12)

What is claimed is:
1. A non-woven material comprising
c) a web of fibers; and
d) an aqueous emulsion binder comprising a water-dispersible polymer which is non-dispersible in aqueous solutions containing 0.5 weight percent or more of an inorganic salt, wherein said water-dispersible polymer comprises from 1 to 100 percent by weight of a hydrophilic monomer and from 0 to 99 percent by weight of at least one non-hydrophilic monomer, wherein a film formed from said polymer has a Tg of from −40 to +105° C.
2. The non-woven material of claim 1 wherein said fibers have a length of less than 5 cm.
3. The non-woven material of claim 1 wherein said fibers have a length of less than 2 cm.
4. The non-woven material of claim 1 comprising 50 to 98 percent by weight of fibers.
5. The non-woven material of claim 1 comprising 70 to 85 percent by weight of fibers.
6. The non-woven material of claim 1 wherein said material has a binder add-on of from 2 to 50 percent by weight.
7. The non-woven material of claim 1 wherein said material has a wet tensile strength in 3 percent aqueous inorganic salt solution of at least 100 g/in, and a wet tensile strength in tap water of at least 40 g/in.
8. The non-woven material of claim 1 wherein said binder further comprises at least one component selected from the group consisting of plasticizers, tackifiers, fillers, humectants, surfactants, salts, fragrances, pigments, titanium dioxide, and encapsulated components.
9. The non-woven material of claim 1 having a web basis weight of from 20 to 200 gsm.
10. A non-woven article comprising the non-woven material of claim 1.
11. The non-woven article of claim 9 further comprising a lotion containing at least one ingredient selected from the group consisting of sodium chloride solution, preservatives, boric acid, bicarbonates, moisturizers, emollients, surfactants, humectants, alcohols, water, and fragrances.
12. The non-woven article of claim 9 further comprising at least 0.5 percent by weight of inorganic salt, or a mixture of inorganic salts.
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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040058073A1 (en) * 2002-09-20 2004-03-25 Bunyard W. Clayton Water-dispersible, cationic polymers, a method of making same and items using same
US20040058600A1 (en) * 2002-09-20 2004-03-25 Bunyard W. Clayton Water-dispersible, cationic polymers, a method of making same and items using same
US20040055704A1 (en) * 2002-09-20 2004-03-25 Bunyard W. Clayton Ion triggerable, cationic polymers, a method of making same and items using same
US20040058606A1 (en) * 2002-09-20 2004-03-25 Branham Kelly D. Ion triggerable, cationic polymers, a method of making same and items using same
US20040062791A1 (en) * 2002-09-20 2004-04-01 Branham Kelly D. Ion triggerable, cationic polymers, a method of making same and items using same
US20040063888A1 (en) * 2002-09-20 2004-04-01 Bunyard W. Clayton Ion triggerable, cationic polymers, a method of making same and items using same
US20050239356A1 (en) * 2001-11-30 2005-10-27 National Starch And Chemical Investment Holding Corporation Crosslinkable cationic emulsion binders and their use as a binder for nonwovens
US20050255016A1 (en) * 2000-06-12 2005-11-17 Svendsen Jeffrey S Sanitizing applicator having a positively charged fabric cover
US20060003654A1 (en) * 2004-06-30 2006-01-05 Lostocco Michael R Dispersible alcohol/cleaning wipes via topical or wet-end application of acrylamide or vinylamide/amine polymers
US20060070712A1 (en) * 2004-10-01 2006-04-06 Runge Troy M Absorbent articles comprising thermoplastic resin pretreated fibers
US20060086472A1 (en) * 2004-10-27 2006-04-27 Kimberly-Clark Worldwide, Inc. Soft durable paper product
US20060252876A1 (en) * 2005-05-03 2006-11-09 Rajeev Farwaha Salt-sensitive vinyl acetate binder compositions and fibrous article incorporating same
US20070141936A1 (en) * 2005-12-15 2007-06-21 Bunyard William C Dispersible wet wipes with improved dispensing
US20070254543A1 (en) * 2006-04-28 2007-11-01 Bunyard W C Dispersible wet wipes
EP1869246A1 (en) * 2005-04-04 2007-12-26 Basf Aktiengesellschaft Humidity-regulating composite materials
US7329705B2 (en) 2005-05-03 2008-02-12 Celanese International Corporation Salt-sensitive binder compositions with N-alkyl acrylamide and fibrous articles incorporating same
USRE40495E1 (en) 2001-09-19 2008-09-09 Commun-I-Tec, Ltd. Substrate treated with a binder comprising positive ions
US7772138B2 (en) 2002-05-21 2010-08-10 Kimberly-Clark Worldwide, Inc. Ion sensitive, water-dispersible polymers, a method of making same and items using same
US20110146927A1 (en) * 2006-01-25 2011-06-23 Rajeev Farwaha Method of making salt-sensitive binders and nonwoven webs
WO2020174471A1 (en) * 2019-02-28 2020-09-03 Wipeflush Ltd. Dispersible wipes reinforced with a binding agent

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005039968A1 (en) 2005-08-23 2007-03-08 Basf Ag Improved moisture-regulating composites
DE102005039974A1 (en) * 2005-08-23 2007-03-22 Basf Ag Improved moisture-regulating composites
US7585797B2 (en) * 2007-04-30 2009-09-08 Kimberly-Clark Worldwide, Inc. Layered dispersible substrate

Citations (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2726230A (en) * 1950-11-24 1955-12-06 Goodrich Co B F Preparation of plastic condensable alkyl acrylate polymers and subsequent elasto-condensation thereof
US3035004A (en) * 1955-03-25 1962-05-15 Rohm & Haas Aqueous polymer dispersions containing (c1-c8)-alkyl acrylate/methacrylic acid copolymer salt thickeners
US3248356A (en) * 1963-09-26 1966-04-26 Dow Chemical Co Multisperse acrylic latexes
US3649581A (en) * 1970-03-02 1972-03-14 Goodyear Tire & Rubber Stable polymeric latices of high carboxyl content
US3677991A (en) * 1968-08-14 1972-07-18 Dow Chemical Co Anionic acrylate latexes that possess sensitivity to alkalinity
US3939836A (en) * 1974-02-07 1976-02-24 Johnson & Johnson Water dispersible nonwoven fabric
US4005251A (en) * 1974-01-07 1977-01-25 Johnson & Johnson Process for preparation of alkali cellulose ester sulfates
US4110291A (en) * 1977-02-18 1978-08-29 Gaf Corporation Copolymer emulsions for thickening acrylic polymer latices
US4151143A (en) * 1977-08-19 1979-04-24 American Cyanamid Company Surfactant-free polymer emulsion coating composition and method for preparing same
US4242408A (en) * 1979-06-25 1980-12-30 The Dow Chemical Company Easily disposable non-woven products having high wet strength at acid pH and low wet strength at base pH
US4309469A (en) * 1977-08-22 1982-01-05 Scott Paper Company Flushable binder system for pre-moistened wipers wherein an adhesive for the fibers of the wipers interacts with ions contained in the lotion with which the wipers are impregnated
US4384096A (en) * 1979-08-27 1983-05-17 The Dow Chemical Company Liquid emulsion polymers useful as pH responsive thickeners for aqueous systems
US4769167A (en) * 1984-02-09 1988-09-06 Hoechst Aktiengesellschaft Aqueous functional fluids based on polymers
US4801671A (en) * 1987-06-25 1989-01-31 Desoto, Inc. Production of alkali-soluble, carboxyl-functional aqueous emulsion thickeners
US5073591A (en) * 1989-07-21 1991-12-17 S. C. Johnson & Son, Inc. Polymeric thickeners and methods of producing the same
US5082892A (en) * 1989-03-02 1992-01-21 Idemitsu Petrochemical Company, Ltd. Novel resin composition and chassis for electronic instruments shaped therefrom
US5252332A (en) * 1992-07-24 1993-10-12 Air Products And Chemicals, Inc. Pre-moistened flushable towlette impregnated with polyvinyl alcohol containing binders
US5312883A (en) * 1991-11-07 1994-05-17 Lion Corporation Water-soluble polymer sensitive to salt
US5317063A (en) * 1989-09-06 1994-05-31 Lion Corporation Water-soluble polymer sensitive to salt
US5332854A (en) * 1990-06-20 1994-07-26 Dai-Ichi Kogyo Seiyaku Co., Ltd. Surfactant
US5384189A (en) * 1993-01-27 1995-01-24 Lion Corporation Water-decomposable non-woven fabric
US5500281A (en) * 1994-02-23 1996-03-19 International Paper Company Absorbent, flushable, bio-degradable, medically-safe nonwoven fabric with PVA binding fibers, and process for making the same
US5521266A (en) * 1994-10-28 1996-05-28 Rohm And Haas Company Method for forming polymers
US5631317A (en) * 1992-12-10 1997-05-20 Lion Corporation Process for producing self-dispersing and salt-sensitive polymer
US5656746A (en) * 1996-03-28 1997-08-12 The Proctor & Gamble Company Temporary wet strength polymers from oxidized reaction product of polyhydroxy polymer and 1,2-disubstituted carboxylic alkene
US5976694A (en) * 1997-10-03 1999-11-02 Kimberly-Clark Worldwide, Inc. Water-sensitive compositions for improved processability
US5986004A (en) * 1997-03-17 1999-11-16 Kimberly-Clark Worldwide, Inc. Ion sensitive polymeric materials
US6063857A (en) * 1997-07-29 2000-05-16 Rohm And Haas Company Solubilized hydrophobically-modified alkali-soluble emulsion polymers
US6291372B1 (en) * 1997-05-23 2001-09-18 Kimberly Clark Worldwide, Inc. Ion sensitive binder for fibrous materials
US6423804B1 (en) * 1998-12-31 2002-07-23 Kimberly-Clark Worldwide, Inc. Ion-sensitive hard water dispersible polymers and applications therefor
US6429261B1 (en) * 2000-05-04 2002-08-06 Kimberly-Clark Worldwide, Inc. Ion-sensitive, water-dispersible polymers, a method of making same and items using same
US6433245B1 (en) * 1997-11-25 2002-08-13 The Procter & Gamble Company Flushable fibrous structures
US6537663B1 (en) * 2000-05-04 2003-03-25 Kimberly-Clark Worldwide, Inc. Ion-sensitive hard water dispersible polymers and applications therefor
US6548592B1 (en) * 2000-05-04 2003-04-15 Kimberly-Clark Worldwide, Inc. Ion-sensitive, water-dispersible polymers, a method of making same and items using same
US6562892B2 (en) * 2001-03-30 2003-05-13 National Starch And Chemical Investment Holding Corporation Highly functional polymer latex
US6579570B1 (en) * 2000-05-04 2003-06-17 Kimberly-Clark Worldwide, Inc. Ion-sensitive, water-dispersible polymers, a method of making same and items using same
US6683129B1 (en) * 2000-03-31 2004-01-27 National Starch And Chemical Investment Holding Corporation Salt sensitive aqueous emulsions

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1132856A (en) * 1978-12-04 1982-10-05 Jerome F. Levy Non-woven fabrics
DE69320936T2 (en) * 1993-01-29 1999-05-20 Lion Corp., Tokio/Tokyo Fleece degradable in water
US5972805A (en) * 1998-04-07 1999-10-26 Kimberly-Clark Worldwide, Inc. Ion sensitive polymeric materials
SV1999000251A (en) * 1998-12-31 2000-10-16 Pfizer Prod Inc DERIVATIVES OF 3,3-BIARILPIPERIDINA AND 2,2-BIARILMORFOLINA REF. PCL0085 / 82805 / BB
KR20020091265A (en) * 2000-05-04 2002-12-05 킴벌리-클라크 월드와이드, 인크. Salt-Sensitive, Water-Dispersible Polymer Composition

Patent Citations (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2726230A (en) * 1950-11-24 1955-12-06 Goodrich Co B F Preparation of plastic condensable alkyl acrylate polymers and subsequent elasto-condensation thereof
US3035004A (en) * 1955-03-25 1962-05-15 Rohm & Haas Aqueous polymer dispersions containing (c1-c8)-alkyl acrylate/methacrylic acid copolymer salt thickeners
US3248356A (en) * 1963-09-26 1966-04-26 Dow Chemical Co Multisperse acrylic latexes
US3677991A (en) * 1968-08-14 1972-07-18 Dow Chemical Co Anionic acrylate latexes that possess sensitivity to alkalinity
US3649581A (en) * 1970-03-02 1972-03-14 Goodyear Tire & Rubber Stable polymeric latices of high carboxyl content
US4005251A (en) * 1974-01-07 1977-01-25 Johnson & Johnson Process for preparation of alkali cellulose ester sulfates
US3939836A (en) * 1974-02-07 1976-02-24 Johnson & Johnson Water dispersible nonwoven fabric
US4110291A (en) * 1977-02-18 1978-08-29 Gaf Corporation Copolymer emulsions for thickening acrylic polymer latices
US4151143A (en) * 1977-08-19 1979-04-24 American Cyanamid Company Surfactant-free polymer emulsion coating composition and method for preparing same
US4309469A (en) * 1977-08-22 1982-01-05 Scott Paper Company Flushable binder system for pre-moistened wipers wherein an adhesive for the fibers of the wipers interacts with ions contained in the lotion with which the wipers are impregnated
US4242408A (en) * 1979-06-25 1980-12-30 The Dow Chemical Company Easily disposable non-woven products having high wet strength at acid pH and low wet strength at base pH
US4384096A (en) * 1979-08-27 1983-05-17 The Dow Chemical Company Liquid emulsion polymers useful as pH responsive thickeners for aqueous systems
US4769167A (en) * 1984-02-09 1988-09-06 Hoechst Aktiengesellschaft Aqueous functional fluids based on polymers
US4801671A (en) * 1987-06-25 1989-01-31 Desoto, Inc. Production of alkali-soluble, carboxyl-functional aqueous emulsion thickeners
US5082892A (en) * 1989-03-02 1992-01-21 Idemitsu Petrochemical Company, Ltd. Novel resin composition and chassis for electronic instruments shaped therefrom
US5073591A (en) * 1989-07-21 1991-12-17 S. C. Johnson & Son, Inc. Polymeric thickeners and methods of producing the same
US5317063A (en) * 1989-09-06 1994-05-31 Lion Corporation Water-soluble polymer sensitive to salt
US5332854A (en) * 1990-06-20 1994-07-26 Dai-Ichi Kogyo Seiyaku Co., Ltd. Surfactant
US5312883A (en) * 1991-11-07 1994-05-17 Lion Corporation Water-soluble polymer sensitive to salt
US5252332A (en) * 1992-07-24 1993-10-12 Air Products And Chemicals, Inc. Pre-moistened flushable towlette impregnated with polyvinyl alcohol containing binders
US5631317A (en) * 1992-12-10 1997-05-20 Lion Corporation Process for producing self-dispersing and salt-sensitive polymer
US5384189A (en) * 1993-01-27 1995-01-24 Lion Corporation Water-decomposable non-woven fabric
US5500281A (en) * 1994-02-23 1996-03-19 International Paper Company Absorbent, flushable, bio-degradable, medically-safe nonwoven fabric with PVA binding fibers, and process for making the same
US5521266A (en) * 1994-10-28 1996-05-28 Rohm And Haas Company Method for forming polymers
US5656746A (en) * 1996-03-28 1997-08-12 The Proctor & Gamble Company Temporary wet strength polymers from oxidized reaction product of polyhydroxy polymer and 1,2-disubstituted carboxylic alkene
US5986004A (en) * 1997-03-17 1999-11-16 Kimberly-Clark Worldwide, Inc. Ion sensitive polymeric materials
US6291372B1 (en) * 1997-05-23 2001-09-18 Kimberly Clark Worldwide, Inc. Ion sensitive binder for fibrous materials
US6063857A (en) * 1997-07-29 2000-05-16 Rohm And Haas Company Solubilized hydrophobically-modified alkali-soluble emulsion polymers
US5976694A (en) * 1997-10-03 1999-11-02 Kimberly-Clark Worldwide, Inc. Water-sensitive compositions for improved processability
US6433245B1 (en) * 1997-11-25 2002-08-13 The Procter & Gamble Company Flushable fibrous structures
US6423804B1 (en) * 1998-12-31 2002-07-23 Kimberly-Clark Worldwide, Inc. Ion-sensitive hard water dispersible polymers and applications therefor
US6683129B1 (en) * 2000-03-31 2004-01-27 National Starch And Chemical Investment Holding Corporation Salt sensitive aqueous emulsions
US20040186222A1 (en) * 2000-03-31 2004-09-23 Eknoian Michael W. Salt sensitive aqueous emulsions
US6429261B1 (en) * 2000-05-04 2002-08-06 Kimberly-Clark Worldwide, Inc. Ion-sensitive, water-dispersible polymers, a method of making same and items using same
US6537663B1 (en) * 2000-05-04 2003-03-25 Kimberly-Clark Worldwide, Inc. Ion-sensitive hard water dispersible polymers and applications therefor
US6548592B1 (en) * 2000-05-04 2003-04-15 Kimberly-Clark Worldwide, Inc. Ion-sensitive, water-dispersible polymers, a method of making same and items using same
US6579570B1 (en) * 2000-05-04 2003-06-17 Kimberly-Clark Worldwide, Inc. Ion-sensitive, water-dispersible polymers, a method of making same and items using same
US6562892B2 (en) * 2001-03-30 2003-05-13 National Starch And Chemical Investment Holding Corporation Highly functional polymer latex

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7279452B2 (en) 2000-06-12 2007-10-09 Commun-I-Tec, Ltd. Sanitizing applicator having a positively charged fabric cover
US20050255016A1 (en) * 2000-06-12 2005-11-17 Svendsen Jeffrey S Sanitizing applicator having a positively charged fabric cover
USRE40495E1 (en) 2001-09-19 2008-09-09 Commun-I-Tec, Ltd. Substrate treated with a binder comprising positive ions
US20050239356A1 (en) * 2001-11-30 2005-10-27 National Starch And Chemical Investment Holding Corporation Crosslinkable cationic emulsion binders and their use as a binder for nonwovens
US8193104B2 (en) * 2001-11-30 2012-06-05 Celanese International Corporation Crosslinkable cationic emulsion binders and their use as a binder for nonwovens
US7772138B2 (en) 2002-05-21 2010-08-10 Kimberly-Clark Worldwide, Inc. Ion sensitive, water-dispersible polymers, a method of making same and items using same
US7141519B2 (en) 2002-09-20 2006-11-28 Kimberly-Clark Worldwide, Inc. Ion triggerable, cationic polymers, a method of making same and items using same
US20040055704A1 (en) * 2002-09-20 2004-03-25 Bunyard W. Clayton Ion triggerable, cationic polymers, a method of making same and items using same
US20040063888A1 (en) * 2002-09-20 2004-04-01 Bunyard W. Clayton Ion triggerable, cationic polymers, a method of making same and items using same
US20040058600A1 (en) * 2002-09-20 2004-03-25 Bunyard W. Clayton Water-dispersible, cationic polymers, a method of making same and items using same
US6960371B2 (en) 2002-09-20 2005-11-01 Kimberly-Clark Worldwide, Inc. Water-dispersible, cationic polymers, a method of making same and items using same
US6994865B2 (en) 2002-09-20 2006-02-07 Kimberly-Clark Worldwide, Inc. Ion triggerable, cationic polymers, a method of making same and items using same
US7456117B2 (en) 2002-09-20 2008-11-25 Kimberly-Clark Worldwide, Inc. Ion triggerable, cationic polymers, a method of making same and items using same
US20040058606A1 (en) * 2002-09-20 2004-03-25 Branham Kelly D. Ion triggerable, cationic polymers, a method of making same and items using same
US7101456B2 (en) 2002-09-20 2006-09-05 Kimberly-Clark Worldwide, Inc. Ion triggerable, cationic polymers, a method of making same and items using same
US20040062791A1 (en) * 2002-09-20 2004-04-01 Branham Kelly D. Ion triggerable, cationic polymers, a method of making same and items using same
US20040058073A1 (en) * 2002-09-20 2004-03-25 Bunyard W. Clayton Water-dispersible, cationic polymers, a method of making same and items using same
US7157389B2 (en) * 2002-09-20 2007-01-02 Kimberly-Clark Worldwide, Inc. Ion triggerable, cationic polymers, a method of making same and items using same
US20070010155A1 (en) * 2002-09-20 2007-01-11 Branham Kelly D Ion triggerable, cationic polymers, a method of making same and items using same
US20060003654A1 (en) * 2004-06-30 2006-01-05 Lostocco Michael R Dispersible alcohol/cleaning wipes via topical or wet-end application of acrylamide or vinylamide/amine polymers
US20060003649A1 (en) * 2004-06-30 2006-01-05 Kimberly-Clark Worldwide, Inc. Dispersible alcohol/cleaning wipes via topical or wet-end application of acrylamide or vinylamide/amine polymers
US7670967B2 (en) 2004-06-30 2010-03-02 Kimberly-Clark Worldwide, Inc. Dispersible alcohol/cleaning wipes via topical or wet-end application of acrylamide or vinylamide/amine polymers
US20060070712A1 (en) * 2004-10-01 2006-04-06 Runge Troy M Absorbent articles comprising thermoplastic resin pretreated fibers
US20060086472A1 (en) * 2004-10-27 2006-04-27 Kimberly-Clark Worldwide, Inc. Soft durable paper product
EP1869246A1 (en) * 2005-04-04 2007-12-26 Basf Aktiengesellschaft Humidity-regulating composite materials
US7320831B2 (en) 2005-05-03 2008-01-22 Celanese International Corporation Salt-sensitive vinyl acetate binder compositions and fibrous article incorporating same
US7329705B2 (en) 2005-05-03 2008-02-12 Celanese International Corporation Salt-sensitive binder compositions with N-alkyl acrylamide and fibrous articles incorporating same
US20060252876A1 (en) * 2005-05-03 2006-11-09 Rajeev Farwaha Salt-sensitive vinyl acetate binder compositions and fibrous article incorporating same
US20070141936A1 (en) * 2005-12-15 2007-06-21 Bunyard William C Dispersible wet wipes with improved dispensing
US20110146927A1 (en) * 2006-01-25 2011-06-23 Rajeev Farwaha Method of making salt-sensitive binders and nonwoven webs
US7989545B2 (en) 2006-01-25 2011-08-02 Celanese International Corporations Salt-sensitive binders for nonwoven webs and method of making same
US8232345B2 (en) 2006-01-25 2012-07-31 Celanese International Corporation Method of making salt-sensitive binders and nonwoven webs
US20070254543A1 (en) * 2006-04-28 2007-11-01 Bunyard W C Dispersible wet wipes
US8133825B2 (en) 2006-04-28 2012-03-13 Kimberly-Clark Worldwide, Inc. Dispersible wet wipes
WO2020174471A1 (en) * 2019-02-28 2020-09-03 Wipeflush Ltd. Dispersible wipes reinforced with a binding agent

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