Classifications

• • 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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
  • A61F13/15211—Properties of the article, e.g. stiffness or absorbency soluble or disintegratable in liquid
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
  • A61F13/15252—Properties of the article, e.g. stiffness or absorbency compostable or biodegradable
• • 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
• • 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.]
  • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
  • Y10T442/184—Nonwoven scrim

Definitions

• sanitary products can be prepared which meet all of the above objects by providing a non-woven structure comprising a water dispersible absorbent inner layer covered at least on one side with a paper or scrim which comprises biodegradable, e.g. cellu I Ce 3,480,016
• degraded is used in its generic sense and is not necessarily limited to chemical degradation, i.e., the reduction of the number of carbon atoms in a chain. Thus, it refers to the swollen, solubilized, partially solubilized, oxidized or reduced state of the resin binder subsequent to interaction with a suitable degrading agent.
• sanitary products within the scope of this invention are catamenial devices such as sanitary napkins or Vaginal tampons, pads for protecting the bed against wetting and similar hygienic products:
• the binders contemplated in the finished products of the instant invention must be stable in body discharge during use and obviously, this excludes all water soluble binders.
• body discharge broadly ranges in pH from extremes of about 4.6 to about 8.4 so that the binders of the instant invention must be stable in the slightly alkaline and slightly acidic discharge encountered during use. Quite obviously, the exact pH encountered within the broad range set forth varies depending upon many factors including the specific end use. Thus, diapers and sanitary napkins are not necessarily subjected to the same pH ranges during use. Therefore, the binders employed must be stable only in the particular body dis- .charge encountered during use.
• water soluble binders can be initially used for application to the biodegradable fibers from aqueous solutions thereof providing such binders are subsequently treated to make them water insoluble.
• the binder in the finished product must be water insoluble.
• binders employed in the instant invention are the fact that they be substantially free from irreversible crosslinking, either in the manufacture of sanitary products or in the use thereof.
• Some of the resins in prior art products were subjected to chemical treatment or significantly high temperatures during manufacture so that they became irreversibly crosslinked. Although this technique does improve the bond between biodegradable fibers such as cellulosic fibers and the resin, it does not result in the production of toilet-flushable articles.
• the binder If the binder is irreversibly crosslinked, it becomes very resistant to most substances, i.e., acids, bases, etc. and thus cannot be readily degraded. Accordingly, one very necessary characteristic of the binders employed is that they be substantially free from irreversible crosslinking both during manufacture or use.
• binders which are only temporarily or reversibly cross linked.
• a polymer can be reacted with a metal salt so that it crosslinks, i.e., ionic crosslinking, yet when treated with a suitable degrading agent such as a base, the
• binders employed in the instant invention are non-irritating to the human body and when combined with cellulose fibers, the resulting product should possess a pleasing hand or feel. It should become immediately apparent that if a binder is employed which is irritating to the human body, it is completely unsuitable irrespective of the fact that it might be stable in body discharge and capable of being degraded in a toilet.
• a test method has been devised to determine whether or not a candidate binder is nonirritating to the human skin.
• a sample one inch square is applied to the skin and held in place with adhesive tape. After 48 hours the sample was removed and -14 days were allowed to elapse. The test was then repeatcd for an additional 48 hours. If any redness, scaliness, accumulation of fluid in the skin, etc. occurred, the polymer was considered unsuitable. This test is more fully described in The Public Health Report, vol. 59, 1944 under Prophetic Patch Test at page 551.
• non-irritating to the human skin as used in the specification and claims is intended to define a polymer which satisfies the above test procedure.
• the disposable sanitary products of this invention should have sufficient dry strength so that handling, folding or packaging will not tear or puncture them.
• the products of this invention can be characterized as possessing a scrim or paper which has a dry, break strength of at least 2.0 pounds.
• the scrim or paper must possess a wet strength of at least 0.25 and preferably at least 0.5 pound.
• wet and dry strength are not sufficient to characterize a product which is useful as a sanitary product in view of the fact that the degree of elongation or stretch must also be taken into consideration if these products are to function properly.
• the products of this invention must possess a dry elongation of from about 3 to about 50 percent and a wet elongation of from about 3 to 50 percent.
• sample strip was soaked in water having a pH of about 7 for about 10 minutes after the 48-hour treatment previously referred to and thereafter tested.
• the biodegradable fibers incorporated with the binder are not narrowly critical and typical examples include protein fibers, e.g. silk, wool, etc., although cellulosic fibers are preferred.
• the types of cellulosic fibers employed are also not critical and cellulose is the preferred fibrous material and regenerated cellulose, i.e., rayon, wood pulps of moderate alpha cellulose content and cotton linters represent conventional sources thereof.
• the average fiber length is not narrowly critical and any convenient length can be employed, although it is advantageous to use less than /2 inch and even .more desirably, less than inch.
• polymers substances are known in the art which are stable in body discharge yet are capable of being degraded upon the addition of a suitable degrading agent.
• Typical examples of these types of polymers would include those polymers which are stable in neutral or acidic media but which dissolve or degrade in alkaline media.
• polymers are known which are stable or insoluble in neutral or alkaline media but which are soluble or degradable in acidic media.
• polymers are known which are stable in the pH range of body discharge but are capable of being dissolved or degraded by organic solvents such as propylene glycol, phenol, etc.
• Still other polymers are stable in body discharge but can be degraded by oxidizing agents such as alkaline hypochlorite solutions commonly known as householdbleach as well as by perborates and by reducing agents such as alkaline hydrosulfites.
• polymers which are stable in neutral or acidic media but which degrade in alkaline media are copolymers of ethylenically unsaturated monoand polycarboxylic acids with ethylenically unsaturated esters or nitriles such as copolymers of acrylic or methacrylic acid and an alkyl acrylate or methacrylate, e.g.
• ethyl acrylate methyl methacrylate, etc., or with acrylonitrile
• carboxy ester lactones copolymers of alpha, beta, ethylene dicarboxylic acids such as maleic acid and vinyl compounds such asstyrene; polyacrylic acid-polyether additives, styrene-monoethyl maleate heteropolyrners, itaconic acid polymers, and the like.
• polymer substances which are stable in neutral or alkaline media but which are degraded or dissolved in acidic media.
• Polymers of this type would include copolymers of aminoacrylates such as dimethylaminomethacrylate and an alkyl acrylate such as ethyl acrylate, polyvinylpyridines, etc. Polymers of this type are also described in various patents including U.S. 3,099,636.
• a polymer or copolymer above-described is mixed with biodegradable fibers such as cellulosic fibers in accordance with methods well known in the art.
• biodegradable fibers such as cellulosic fibers
• With preformed paper webs it can be sprayed on by conventional spraying methods and then dried.
• the dried sprayed scrims of this invention have greatly increased wet and dry strength as compared to the corresponding untreated webs and are completely dispersible in water upon the addition of a suitable degrading agent.
• the resin can also be applied by passing the paper web through nip rolls which are wet with a solution of the resin. The wet web can then be dried in hot air.
• the resin can also be added during the pulp beating operation.
• the absorbent inner core or padding can be composed of foamed cellulose, shredded wood pulp or any other absorbent, water dispersible material.
• this material is a cellulosic and most preferably, cellulose.
• the shredded wood pulp is in the form of a batt as produced, for example, by a Rando- Webber machine (Curlator Company, Rochester, N.Y.).
• Foam material suitable for use as the absorbent inner layer can be prepared simply by agitating or foaming a mixture of short length fibers and a wetting agent in water and drying the foam.
• the nature of the short length fibers is not critical.
• Cellulose is the preferred fibrous material and wood pulps of moderate alpha cellulose content represent a convenient source thereof.
• Cotton linters represent another good source.
• the average fiber length is advantageously less than /2 inch, and desirably less than A inch.
• the relative proportions of fibrous cellulosic material and water should be such as to produce a tractable slurry. Generally this calls for a weight ratio of water to cellulose of at least :1. It is critical however that the cellulose constitutes at least 0.7% by weight of the total foam slurry.
• the nature of the wetting agent is not critical but need only have the properties of forming readily stable bubbles and foam.
• Preferred wetting agents are the anionic surfactants such as the salts of long-chain sulfites and sulfates such as the sodium sulfate derivative of 3,9-diethyl tridecanol-6 (T ergitol 7), the ammonium sulfate ester of alkylphenoxypoly (ethylenoxy) ethanol (Alipal CO-346) and the coconut oil acid ester of sodium isethionate (Igepon AC-78).
• the proportion of foaming agent is advantageously in the range of 0.2 to 1% by weight based on the weight of water in the slurry.
• a preferred embodiment of this invention resides in the preparation of disposable sanitary products with either acid degradable or, more preferably, alkaline degradable binders having certain maximum degradable values (D) hereinafter set forth.
• the most useful polymers for the preparation of the novel products of this invention are those which not only possess all the characteristics previously set forth, but also have degradability values (D) no greater than about 5.
• Degradability values (D) in accordance with this invention are determined by preparing a sample non-woven scrim strip two inches long and one inch wide consisting of cellulosic fibers less than /2 inch bonded together with 30% by weight of a candidate binder which has been heated to a temperature of 90 C. for about 10* minutes.
• the sample strip is placed in one liter of water at room temperature to which is added either 2 cc. of 1.0 Normal HCl (if the polymer is acid degradable) or 2 cc. of 1.0 Normal NaOH (if the polymer is degradable in alkaline medium).
• test sample is then stirred in either the acid or alkaline solution and the time in minutes for the binder to substantially degrade and release the cellulosic fibers (D) is carefully measured.
• D values no greater than 5 and even more preferably, no greater than 3 are preferred.
• Specific polymers having all the characteristics previously set forth including D values less than 5 would include a copolymer of parts by weight ethylacrylate and 20 parts by Weight methacrylic acid.
• Another suitable binder is a copolymer comprising 60 parts by weight of acrylonitrile and 40 parts by weight methacrylic acid.
• a fibrous web may be formed in any suitable manner such as by carding, garneting, or by dry deposition from air suspension of the fibers and thereafter impregnated with a solution or dispersion of the resin and then oven dried at temperatures sufiiciently low to prevent the binder from becoming thermally crosslinked.
• the maximum temperature will vary depending upon the particular binder, nevertheless, it has been found desirable never to exceed temperatures of about 150 C. and even more preferably, to operate at temperatures of from 70 to C. when drying th product.
• the bonded cellulosic fiber, scrim or paper previously described can be used to prepare sanitary products in a wide variety of ways according to techniques well known in the art.
• the scrim or paper can cover one or both sides of the absorbent inner layer.
• one side is covered by a moisture impermeable film.
• This embodiment precludes the need for a separate supporting garment such as rubber pants since the film keeps the outer surface dry.
• the nature of the impermeable film is not critical. In a preferred embodiment, it is composed of a material which has water solubility properties similar to that of the resin employed in binding the paper.
• the film can in fact be one which is cast from the same resinous material employed in the paper.
• the backing layer can be laminated to the rest of the structure by numerous means apparent to those skilled in the art. This can be conveniently conducted by wetting either the inner layer or film with a binder and then compressing the two layers.
• the binder comprises 10 to 60 weight percent of the mixture of the same and the biodegradable fibers. It is to be immediately understood that when multi-layer products are contemplated, e.g. a cellulosic pad covered on both sides with a scrim, that the above percentages apply only to the layer or layers containing both the binder and cellulose fibers. In the above illustration, the percentages apply to the scrim only without any consideration of the pad. Quite obviously, this is necessary since the thickness of the pad can vary and what is critical is the relative proportion of binder and fibers in the scrim and not the proportion of scrim to hinder.
• alkaline materials would include ammonia, sodium carbonates, ammonium borat-e and the like.
• Preferred alkaline materials would include alkali metal borates, phosphates and silicates, e.g. sodium borate, potassium phosphate, potassium silicate, sodium hypochlorite, etc.
• Typical acidic substances are citric acid, boric acid and acid salts such as calcium and ammonium chloride.
• Preferred acidic materials include acetic acid, citric acid and dilute hydrochloric acid. Quite obviously, any acid or base can be employed such as dilute hydrochloric acid or dilute potassium hydroxide, but these materials may not be generally found about the home.
• Typical oxidizing and reducing agents which can be used are sodium hypochlorite, sodium perborate, sodium hydrosulfite, sodium sulfoxylate and the like. Typical.
• solvents include propylene glycol, alcohol, phenol and the like.
• the degrading agent interacts with the binder causing it to degrade and the sanitary products are thereafter dispersed in the toilet system by the act of flushing. It is specifically noted that the degrading agent, per se, does not disperse the sanitary products since it substantially only interacts with the binder.
• the biodegradable fibers are dispersed only upon agitation as is accomplished either by stirring or more simply, by the act of flushing.
• perfumes or deodorants in the premeasured degrading agents in order to minimize the unpleasant odors usually encountered in the disposal of sanitary products. It is also noted that perfumes or deodorants can be incorporated into the sanitary structure per seeither in the scrim or in the absorbent padding or in both. Additionally, it is also within the scope of this invention to incorporate into the sanitary products bacteriostatic and dye additives if such is desired.
• EXAMPLE 1 60 grams of acrylonitrile and 40 grams of methacrylic acid are mixed together to form a monomer mixture. Four hundred grams of acetonitrile are heated to reflux. One half gram of benzoylperoxide dissolved in acetonitrile is added to the refluxing acetonitrile and the monomer mixture is added over a period of one hour. An additional one half gram of benzoyl peroxide is added and reflux is continued for three hours. The percipitated polymer is recovered, and washed free of acetonitrile.
• the precipitated polymer is found to be non-irritating to the human skin. It is found to be substantially free from any crosslinking.
• a portion of the above polymer was dissolved in toluene and thereafter applied to a web of cellulose fibers by impregnation and then dried in air at a temperature of about 100 C. to yield a composition comprising cellulose fiber and 30 parts by weight of the above polymer.
• a sample strip two inches long and one inch wide was tested for its degradability value (D) in accordance with the procedure set forth in Example 1, and it was found to have a D value of about 2.
• a strip 14 inches long by 4 /2 inches wide was cut from said web and about 20 grams of a non-woven absorbent pad was added to form a diaper.
• the diaper was found to possess the following physical characteristics.
• the above diaper was found to be stable in body discharge. However, if after use it is placed in a toilet and two grams of sodium hydroxide are added, it is found that after about 3 minutes the binder was degraded so that the diaper can be safely flushed.
• EXAMPLE 2 Alkali soluble polymer for scrim 2400 grams of benzene were placed in a reactor and heated to 80 C. 3 grams of benzoyl peroxide was added to the reactor and the solution was swept with nitrogen. A solution of grams of styrene, 180 grams of methacrylic acid, 330 grams of 2-ethylhexyl acrylate, and 3 grams of benzoyl peroxide was added to the reactor held at 80 C. over a period of 30 minutes. After one hour at 80 C., 3 grams of benzoyl peroxide was added to the reactor and heating was continued at 80 C. for two hours. The heating of the reactor was then stopped and the reaction was left to cool to room temperature.
• the emulsion polymer formed can be used in the Example 3 formulation in place of the 80/20 ethyl acrylate methacrylic acid emulsion copolymer.
• the binder in the resultant diaper will degrade in acidic media and has a D value of 3.
• EXAMPLE 4 350 grams of water and 15 grams of Alipal CO-436 (alkylphenol-ethylene oxide condensation product) were charged to a reactor and heated to 55 C. under a nitrogen gas sweep. A monomer mixture was prepared at 75 grams of methacrylic acid, 75 grams of acrylonitrile, grams of water, 0.3 gram of Cellosize WP-09 (a hydroxyethyl cellulose), and 15 grams of Alipal CO-436 and 150 grams of 2-ethyl hexoacrylate were mixed in a Waring blender for one minute. 25 percent by volume of this mixture was added to the reactor at 55 C.
• Alipal CO-436 alkylphenol-ethylene oxide condensation product
• a web of cellulose fibers was impregnated with 30 weight percent of the above polymer to form a scrim.
• the scrim was used to cover an absorbent pad of unbound cellulosic fibers in order to make santiary products such as diapers and sanitary napkins.
• the resulting sanitary products had the following properties:
• Example 5 The procedure of Example 2 was repeated with the exception that 15 parts by weight of styrene, 30 parts by weight of methacrylic acid and 55 parts by weight of 2-ethylhexylacrylate were employed. The resulting polymer was then mixed with 50% by weight of cellulose fibers to form a scrim.
• EXAMPLE 6 In a manner analogous to the procedure set forth in Example 2, a binder was prepared by polymerizing a monomer mixture comprising 20 parts by weight of methyl methacrylate, 55 parts by weight of Z-ethylhexylacrylate and 25 parts by weight of methacrylic acid.
• EXAMPLE 7 The above scrim could be used to produce sanitary products in accordance with the method of this invention.
• EXAMPLE '8 A binder was prepared by copolymerizing 70 parts by weight of 2-ethylhexylacrylate and 30 parts by weight of; methyl methacrylic acid in a manner analogous to the procedure set forth in Example 2.
• the above scrim was then used to prepare a sanitary product by using it to cover both sides of an absorbent unbound cellulosic fiber pad.
• the resulting sanitary product was completely unsuitable for use in that it fell apart during use and it did not retain its structural stability. Its poor performance is attributed to the fact that the wet break strength, i.e., 0.24 pound, was insufiicient to give the sanitary product the strength that it needs during use.
• EXAMPLE 9 A suitable binder was the butyl half ester of a copolymer of methyl vinyl ether and maleic anhydride.
• the polymer resulting from the above copolymerization was utilized as a binder for cellulose fibers in order to prepare a scrim.
• the scrim had excellent physical properties and was suitable for the production of sanitary products by using it to cover at least one side of an absorbent cellulose pad.
• the binder is a copolymer of equal parts by weight of styrene and maleic anhydride and the polymers differ from each other in the molecular weight.
• Polymers A, B and C were then dissolved in acetone and used to bind cellulosic fibers in order to prepare a scrim.
• the scrim prepared with polymer A is labeled Example 10
• the scrim prepared with polymer B is labeled Example 11
• the scrim prepared with polymer C is labeled Example 12.
• a toilet flu'shable non-woven structure capable of absorbing body discharge comprising water dispersible absorbent material covered at least one one side with a scrim characterized by (a) a dry break strength of at least 2.0 pounds;
• said scrim comprising biodegradable fibers held together with a binder which is substantially water insoluble, non-irritating to the human body and which is stable in said body discharge; said binder being substantially free from irreversible crosslinking and capable of being degraded and releasting said biodegradable fibers upon 11 the addition thereto of a substance which is capable of interacting with said binder and degrading the same.
• composition of claim 1 wherein the binder comprises about 10 to about 60 weight percent of said structure and is capable of being degraded in acidic media.
• composition of claim 1 wherein the binder comprises about 10 to about 60 weight percent of said structure and is capable of being degraded in alkaline media.
• a toilet flushable non-Woven structure capable of absorbing body discharge comprising water dispersible absorbent material covered at least on one side with a scrim characterized by (a) a dry break strength of at least 2.0 pounds;
• said scrim comprising cellulosic fibers held together with from about 10 to about 60 weight percent of binder which is substantially water insoluble, non-irritating'to the human body and which is stable in said body discharge; said binder being substantially free from irreversible crosslinking and having a D value less than 5 and capable of being degraded and releasing said cellulosic fibers upon the addition thereto of a substance which is capable of interacting with said binder and degrading the same.
• a toilet fiushable non-Woven structure capable of absorbing body discharge comprising water dispersible absorbent material covered at least one one side with a scrim characterized by (a) a dry break strength of at least 2.0 pounds;
• a toilet flushable non-woven structure capable of absorbing body discharge comprising water dispersible absorbent material covered at least on one side with a scrim characterized by (a) a dry break strength of at least 2.0 pounds;
• a dispersible diaper comprising the composition of claim 1.
• a dispersible diaper comprising the composition of claim 4.
• a dispersible diaper comprising the composition of claim 5.
• a dispersible diaper comprising the composition of claim 6.
• a dispersible sanitary napkin comprising the composition of claim 1.
• a dispersible sanitary napkin comprising the composition of claim 4.
• a process for the disposal of non-woven structures capable of absorbing body discharge comprising water dispersible absorbent material covered at least on one side with a scrim characterized by (a) a dry break strength of at least 2.0 pounds;
• said scrim comprising biodegradable fibers held together with from about 10 to about weight percent of binder which is substantially water insoluble, non-irritating to the human body and which is stable in said body discharge; said binder being substantially free from irreversible crosslinking and having a D value less than 5 which comprises placing said structure in a toilet and adding thereto a substance capable of interacting with said binder so as to degrade the same flushing the structure down the toilet.
• a process for the disposal of non-woven structures capable of absorbing body discharge comprising water dispersible absorbent material covered at least one one side with a scrim characterized by (a) a dry break strength of at least 2.0 pounds;

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• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• General Health & Medical Sciences (AREA)
• Epidemiology (AREA)
• Veterinary Medicine (AREA)
• Public Health (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• Vascular Medicine (AREA)
• Heart & Thoracic Surgery (AREA)
• Biomedical Technology (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Textile Engineering (AREA)
• Hematology (AREA)
• Materials Engineering (AREA)
• Nonwoven Fabrics (AREA)
• Absorbent Articles And Supports Therefor (AREA)

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Cited By (43)

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Citations (8)

• 1968
  • 1968-09-03 US US3480016D patent/US3480016A/en not_active Expired - Lifetime
• 1969
  • 1969-02-01 DE DE19691904945 patent/DE1904945A1/de active Pending
  • 1969-02-03 BE BE727826D patent/BE727826A/xx unknown
  • 1969-02-03 CH CH164569A patent/CH502185A/fr not_active IP Right Cessation
  • 1969-02-03 BR BR20608769A patent/BR6906087D0/pt unknown
  • 1969-02-03 NL NL6901714A patent/NL6901714A/xx unknown
  • 1969-02-03 FR FR6902318A patent/FR2001264A1/fr not_active Withdrawn

Patent Citations (8)

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