US3670731A - Absorbent product containing a hydrocolloidal composition - Google Patents

Absorbent product containing a hydrocolloidal composition Download PDF

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US3670731A
US3670731A US551772A US3670731DA US3670731A US 3670731 A US3670731 A US 3670731A US 551772 A US551772 A US 551772A US 3670731D A US3670731D A US 3670731DA US 3670731 A US3670731 A US 3670731A
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absorbent
hydrocolloidal
diaper
dressing
composition
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Carlyle Harmon
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Johnson and Johnson
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Johnson and Johnson
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    • 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
    • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/225—Mixtures of macromolecular compounds
    • 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
    • A61F13/01—Non-adhesive bandages or dressings
    • A61F13/01008—Non-adhesive bandages or dressings characterised by the material
    • 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
    • A61F13/20—Tampons, e.g. catamenial tampons; Accessories therefor
    • A61F13/2051—Tampons, e.g. catamenial tampons; Accessories therefor characterised by the material or the structure of the inner absorbing core
    • A61F13/206—Tampons made of rolled-up material
    • 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
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • 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
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
    • 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
    • A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
    • 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
    • A61F13/20—Tampons, e.g. catamenial tampons; Accessories therefor
    • A61F13/2002—Tampons, e.g. catamenial tampons; Accessories therefor characterised by the use
    • A61F13/202—Catamenial tampons
    • 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
    • A61F2013/00089—Wound bandages
    • A61F2013/00246—Wound bandages in a special way pervious to air or vapours
    • A61F2013/00251—Wound bandages in a special way pervious to air or vapours with macroscopic openings
    • 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
    • A61F2013/00361—Plasters
    • A61F2013/00727—Plasters means for wound humidity control
    • A61F2013/00731—Plasters means for wound humidity control with absorbing pads
    • A61F2013/00744—Plasters means for wound humidity control with absorbing pads containing non-woven
    • 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
    • A61F2013/00361—Plasters
    • A61F2013/00727—Plasters means for wound humidity control
    • A61F2013/00748—Plasters means for wound humidity control with hydrocolloids or superabsorbers
    • 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
    • A61F2013/00361—Plasters
    • A61F2013/00855—Plasters pervious to air or vapours
    • A61F2013/00859—Plasters pervious to air or vapours with macroscopic openings
    • 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
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • 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
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/530489—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being randomly mixed in with other material
    • A61F2013/530496—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being randomly mixed in with other material being fixed to fibres
    • 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
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/53051—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
    • 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
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F2013/53445—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad from several sheets
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/254—Polymeric or resinous material

Definitions

  • ABSTRACT An absorbent dressin havin an absorbent la er defined b 6 R 1 Ci 3 g Y Y [5 1 e "was ted water soluble hydrocolloidal composition capable of absorb- UNITED STATES PATENTS ing of at least about fifteen times its weight of body exudate and retaining said exudate under pressure of up to about 2.5 2,750,944 6/1956 Tollstrup ..128/290 psi 2,810,716 10/1957 Markus ....260/88.1 3,121,427 2/1964 Mosier 128/290 11 Claims, 13 Drawing Figures ABSORBENT PRODUCT CONTAINING A HYDROCOLLOIDAL COMPOSITION
  • the present invention relates generally to absorbent dressings and, more particularly, to diapers, to sanitary napkins, to catamenial tampons, and to absorbent wound dressings, e.g., surgical dressings, which are characterized
  • the absorbent dressings of the invention As a result of the nature of the absorption of the body exudate by the particulate hydrocolloidal component used in the absorbent dressings of the invention, i.e., imbibing with concomitant swelling so that particulate body form is maintained.
  • the surface of the wet dressing has a dry-to-thmtouch feel.
  • Test results show in the case of a diaper in accordance with the invention, that it will hold" absorbed liquid in amounts of 30 and more times the weight of the particulate hydrocolloidal component, under a pressure of up to 2.5 psi It may be that during actual use of the diaper of the invention the movements of the child may be such as to apply a temporary extraordinary pressure here and there, sufficient to disgorge some absorbed urine from swollen particulates containing the same. Be that as it may, if some absorbent particulates in the diaper have absorbed their full capacity considering the pressure applied, other surrounding absorbent particulates which have not absorbed up to their capacities, are capable of absorbing additional urine, with the result that the diaper feels substantially dry to the touch at substantially all times during a normal time interval of use.
  • the substantially water-insoluble particulate hydrocolloid absorbent material in use in an absorbent dressing in accordance with the invention, is spread as uniformly as possible onto and/or into a carrier sheet commonly used in making an absorbent dressing, so that the carrier sheet and the applied particulate layer can be fashioned by conventional procedures into an absorbent dressing in accordance with the invention.
  • the particulate absorbent material is sandwiched between a pair of carrier sheets and then incorporated by conventional procedures into an absorbent dressing according to the invention, thus insuring that the desired discrete particulate hydrocolloid layer is maintained in the final structure.
  • the hydrocolloidal absorbent material used in accordance with this invention may be in solid form such as, for example, a fiber, thin film, or a cellular structure, all of which provide a large surface area; however, it is preferred that it be in particulate form such as a flake or granule, since these forms provide the largest surface area for absorption and insure that max imum surface area is available for absorbency.
  • the carrier sheet for the particulate hydrocolloid layer in the product may be an absorbent mass or pad of textile fibers, wood pulp fibers, cotton linters and mixtures of such fibers, one or more sheets of bonded textile fibers, either synthetic or natural fibers, or a mixture thereof.
  • the term "carrier sheet” also includes a composite of layers of absorbent tissue, e. g., creped tissue, paper sheets and water impermeable films and fibrous sheets, perforated, if desired, to allow liquids to pass therethrough freely, if desired.
  • the carrier sheets which may be used to make the absorbent dressing of the invention may be those which are commonly used in making absorbent dressings of conventional construction.
  • Water-insoluble particulate hydrocolloid compounds of the type herein contemplated are presently known materials, but their uses in the past have not been related to that herein contemplated, i.e., as an absorbent material in absorbent dressings, wherein the absorbent material maintains its particulate character as it imbibes and absorbs many times its weight of surrounding liquid, and in doing so swells.
  • the absorbent, water-insoluble particulate hydrocolloid contemplated herein is capable of absorbing from about [5 to 70 times its weight of water, urine and other body exudates. In doing so each individual absorbent particle swells or enlarges several hundred percent times its individual parameter without destruction of its initial particulate integrity.
  • the particulate, water-insoluble hydrocolloid accepts liquid it substantially immobilizes the same therein, and the resulting particulate, liquid-swollen structure is gelatinous.
  • the mass of swollen particulate water-insoluble hydrocolloid particles within the body of the sanitary dressing define an aciniform structure since each individual absorbent particle is a greatly enlarged particle, having become liquid-swollen or grape-like or acinus in form due to the water, urine or other liquid it has absorbed.
  • the individual, swollen, hydrocolloid particles are tacky and hence within the absorbent dressing they are in a clustered mass of liquid-swollen particles. The particles remain in this aciniform state even in the presence of liquid in exces of their ability to absorb.
  • liquid-swollen hydrocolloid particles bind their absorbed water tightly, as already indicated, but upon drying the particles are dehydrated and return more or less to their original size. At this time they can again operate more or less as before to absorb and bind liquids, and hence in the case of an emergency the diaper of the invention lends itself for reuse.
  • the water-insoluble hydrocolloid absorbent particles used in accordance with the present invention are presently known materials, generally being a hydrocolloid polymer material having from about 25 to 72 percent of its molecular structure composed of hydrophilic groups, and whose polymeric network has been crosslinked to introduce a limited water insolubility into the molecule.
  • Suitable water-insoluble hydrocolloid absorbent material in accordance with the invention have a minimum average molecular weight per crosslinkage of about 13,000 and a maximum molecular weight per crosslinkage of about 276,000.
  • the extent of crosslinking is contained so that the polymeric network of the hydrocolloid is not soluble in water, urine and the like, yet remains flexible and swells as water and other liquid is absorbed within its structure. As the hydrocolloid swells it maintains the approximate shape and geometry it had before contact with liquid, but the dimensions thereof are greatly enlarged to provide for the binding of the liquid absorbed therein.
  • absorbent dressing containing water-insoluble hydrocolloid absorbent particles in accordance with the invention are distinguishable from the prior an absorbent dressings which may have had incorporated in their structure natural and/or synthetic water soluble hydrocolloid materials to increase the viscosity of, i.e., to thicken, the liquid absorbed into the absorbent dressing structure.
  • the crosslinked, water-insoluble particulate hydrocolloids of the invention are not the equivalent of known natural soluble hydrocolloids such as agar, karaya and the water-soluble gums (tragacanth, arabic, locust beam, and guar), or of synthetic hydrocolloids such as carboxymethyl cellulose and carboxyethyl cellulose.
  • These soluble hydrocolloids serve only to increase viscosity of liquids and in the presence of an added liquid excess, lose their power to retain the viscosity they had previously achieved.
  • the crosslinked hydrocolloid absorbent material within the diaper of the invention swells upon absorption of liquid and retains the absorbed liquid so that it does not flow back on the child.
  • the swollen hydrocolloid remains essentially locked in position within the diaper structure and does not penetrate the diaper facings. Liquid taken into the swollen structure is retained well under the pressures encountered in use. And with any excess of liquid the discrete, separate, liquid-swollen hydrocolloid entity maintains its maximum swollen form.
  • the water-insoluble hydrocolloid absorbent material which may be used in accordance with the present invention preferably is a crosslinked polyacrylamide or a crosslinked sulfonated polystyrene or a mixture of these acrylamides and polystyrenes.
  • the preferred hydrolyzed polyacrylamide hydrocolloid absorbent materials of the invention suitably are compounds having the following structural fom'iula:
  • Y is a hydrogen, ammonium or an alkali metal ion
  • n is a number from I to I00
  • n is a number from to 100 and defines the degree of hydrolysis
  • Z is a number from I to 30, where 2 times 100 is equal to the number of mer units between crosslinks.
  • the crosslinked polyacrylamide hydrocolloid material of the invention may be prepared by known techniques, e.g., by crosslinking a linear polyacrylamide (or by copolymen'zing an acrylamide) with a non-conjugated divinyl compound such as methylene bis acrylamide. In the latter case, the polymerization may be run by any of the standard methods including the use of peroxide catalysts, or by photo polymerization with riboflavin activator.
  • the crosslinking compound may be present in an amount of from about 500 to about 5,000 parts per million of polymerizate.
  • non-conjugated divinyl crosslinking compounds are l,4-divinyl benzene; N,N-diallylacrylamide; diallylamine; diallylmethacrylamide; 2,5-dimethyl-L7-octadiene; p,p'-diisopropenylbenzene', 2,8-dimethyl-1,8- nonadiene and diethylene glycol divinyl ether.
  • the preferred polyacrylamides are those in the above general formula that are hydrolyzed and wherein Y is sodium or potassium, n is equal to a number in the range of 10 to 70 and Z is a number in the range of 2 to 20. Most preferably, Y is sodium, n and Z are numbers within the ranges to 40 and 4 to l5, respectively.
  • Crosslinked polystyrene sulfonate hydrocolloid absorbent materials which may be used in accordance with the invention preferably are those which have been crosslinked with nonconjugated divinyl compounds as above set forth.
  • These polystyrene sulfonates are known materials and have the following general structural formula:
  • Z is a number from to 3,000 and defines the number of mer units between cross links
  • Y is a hydrogen, ammonium or an alkali metal ion.
  • crosslinked polystyrene sulfonates are prepared by known procedures, e.g., by copolymerizing styrene with a non-conjugated divinyl compound such as divinyl benzene in the presence of a polymeriution catalyst such as benzoyl eroxide. It is customary to add a suspension stabilizer (such as gelatin or polyvinyl alcohol) so that small polymer beads in the range of from about I micron to about 2 millimeters will be formed during the polymerization.
  • a suspension stabilizer such as gelatin or polyvinyl alcohol
  • the resultant polymer is sulfonated, for example, by heating it in the presence of concentrated sulfuric acid at a temperature of about l00 C.
  • wicking The mechanism whereby water or liquid is lead through the outer covering sheet or through the facing sheet of the absorbent dressing to the hydrocolloid absorbent medium incorporated into the structure of the dressing is generally termed wicking".
  • Wicking is effected generally by fibers either in the covering or facing sheet or within the absorbent medium. These fibers act as channels to direct the liquids deposited on the surface of the absorbent dressing into the contained hydrocolloid absorbent medium.
  • both means may be utilized simultaneously or individually depend ing upon the desired composition of the facing or covering sheet and whether the hydrocolloid is the sole absorbent medium or whether it is combined with a fibrous absorbent mass.
  • the hydrocolloid absorbent medium used in accordance with this invention may be constructed of a blend of the hydrocolloid with a mass or pad of fibers or a composite of layers of absorbent tissue, e.g., creped tissue.
  • FIG. I is a perspective view of a diaper or surgical dressing of the invention with a portion thereof cut away;
  • FIG. 2 is a cross section taken along 2 2 of FIG. I;
  • FIG. 3 is the same cross section as FIG. 2 after use and during which absorption of body exudates has taken place;
  • FIG. 4 is a perspective view of another embodiment of a diaper or surgical dressing of this invention, with portions thereof cut away;
  • FIG. Si is a cross section taken along 5 5 of FIG. 4;
  • FIG. 6 is the same crm section as FIG. 5 after use and dur ing which absorption has taken place;
  • FIG. 7 is a perspective view of a sanitary napkin embodying the invention, shown partially open to illustrate the same;
  • FIG. 8 is a perspective view of a catamenial tampon embodying the invention, shown partially open to illustrate the same;
  • FIG. 9 is a cross section taken along line 9 9 of FIG. 8,
  • FIGS. 10 and II are planar views of other embodiments of a tampon construction before the same are formed into tampons',
  • FIG. 12 is a view of a tampon constructed from the embodiment shown in FIG. 1!, portions being broken away to show details;
  • FIG. 13 is a cross section of an absorbent dressing used for testing to illustrate the efficiency of this invention.
  • the facing sheet 3 is a porous non-woven fabric made of individualized fibers bonded together in a pattern of spaced binder areas.
  • the backing sheet 4 is a moisture-resistant sheet, e.g., a thin gauge polyethylene film.
  • the facing sheet 3 and the backing sheet 4 are adhered together along common edges 6 by a selected adhesive.
  • the facing sheet 3 and the backing sheet 4 are the carriers" in this diaper construction.
  • the facing sheet 3 may be a sheet of soft, absorbent paper, a lightweight intermittently bonded or overall impregnated nonwoven fabric, a thin perforated plastic film or any such material which will readily pass liquids therethrough and which present a smooth and soft surface for contacting the wearer's body.
  • the layer of absorbent material 9 have a backing sheet 4 constructed of a waterproof material such as a layer of waterproof paper, a thin water-repellent film, etc.
  • the facing sheet 3 and the backing sheet 4 are secured to each other along their longitudinal edges to prevent movement of the layers with respect to each other.
  • the sheets 3 and 4 may be secured by any method known in the art, such as by glue, embossing the edges, etc.
  • the hydrocolloidal absorbent composition 8, in particulate form, may be applied to the fibrous layer 9 by sprinkling or dusting the hydrocolloid absorbent into the absorbent pad.
  • the absorbent pad 9 may be constructed of a plurality of sheets of absorbent material, and in such a case the hydrocolloidal absorbent 8 may be adhesively secured to the surface of one or more of the sheets.
  • the fibrous material composing the absorbent pad 9 may be constructed of any known absorbent material such as fluffed wood pulp, woven cloth, cotton linters, a plurality of plies of creped tissue, and the like.
  • Yet another means for securing the hydrocolloid in place with any diaper or absorbent dressing is to emboss the surface of the absorbent pad 9 to provide cavities such as parallel ribbon-like channels, diamond patterns, etc., that will contain the absorbent hydrocolloid 8 to insure substantially uniform distribution.
  • FIG. 2 is a cross section taken along line 2 2 of FIG. I and shows the absorbent pad 9 constructed of absorbent fibers 7 and having particles of the hydrocolloid absorbent material 8 attached or secured to, or mechanically intermixed with the fibers.
  • the sheets 3 and 4 are joined along their common edges 6 by an adhesive 10.
  • FIG. 3 shows the same cross section as is shown in FIG. 2 but after use, and thus after absorption has taken place.
  • the fibers 7 comprising the absorbent pad 9 aid in retaining the gelatinous mass of liquid-swollen hydrocolloid absorbent II in substantially uniform distribution throughout the length and width of the diaper.
  • the need for the absorbent pad 9 can be obviated by techniques such as embosing whereby the substantially unifonn positioning of the hydrocolloid absorbent is virtually insured.
  • the hydrocolloid of the aforegiven definition does form essentially the total of the absorbent medium, and in fact, will be the entire absorbent medium if absorbent carriers are not utilized.
  • FIG. 4 Another absorbent dressing, and more specifically a second diaper l2, encompassing this invention, is shown via FIG. 4.
  • the facing and backing sheets, 3 and 4 respectively, are as defined in FIG. I; however, the absorbent medium is defined by a layer of hydrocolloid absorbent 5 in fine flake form in this instance.
  • the absorbent flakes 5 are substantially uniformly dispersed along the inner face of the backing sheet 4 and kept in position by an adhesive layer 14, first applied to the inner surface of the backing sheet 4.
  • a thin wood pulp underlay 13 is secured uniformly to the inner surface of the facing sheet 3 to provide wicking action in the diaper 12.
  • the diaper defines the diaper more particularly. Note the bottom most layer of the hydrocolloidal absorbent composition 5 secured by adhesive 14 to the inner surface of the backing sheet 4.
  • the pulp underlay 13 helps to keep the hydrocolloid absorbent in position to provide an absorbent core.
  • the pulp underlay 13 is clearly seen secured to the inner surface of the facing sheet 3.
  • FIG. 6 depicts the same cross section as shown in FIG. 5 but after the diaper 12 has been used for its intended purpose and has had a quantity of body exudate absorbed in it.
  • the hydrocolloidal absorbent 16 is liquid swollen and is of the characteristic gelatinous aciniform structure.
  • the pulp underlay also contributes substantially to maintain the position of the gelatinous mass such that substantial flatness of the diaper is maintained.
  • the diapers shown via FIGS. 1 6 could also represent surgical dressings or other absorbent patches or bandages.
  • the size of the dressing need simply to be reduced accordingly since the dressing would continue to function to absorb and retain body exudate.
  • a sanitary napkin 40 incorporating the invention includes a relatively thick absorbent core 18 enclosed within a liquid pervious fibrous wrapper I2 whose ends extend beyond the ends of the absorbent core 18 to provide the usual attachment tab 13.
  • the absorbent core 18 can be about 8 inches long, 2 '1; inches wide and one-fourth to one-half inch thick and in this instance consists of a layer of the aforedefined particulate hydrocolloidal absorbent composition 19 interposed between several layers of fibrous material I5 such as cotton webs, air-layered cellulosic fiber webs, non-woven or textile fibrous webs, wood pulp batts, tissue pulp or like materials which are highly absorbent.
  • fibrous material I5 such as cotton webs, air-layered cellulosic fiber webs, non-woven or textile fibrous webs, wood pulp batts, tissue pulp or like materials which are highly absorbent.
  • the entire core assembly is enclosed within the liquid pervious wrapper I2.
  • the hydrocolloidal absorbent 14 may be randomly interspersed
  • FIGS. 8 and 9 there is illustrated a catamenial tampon 21 incorporating the invention, and which includes the elongated cylindrical core 22 of densely packed absorbent fibers enclosed with a liquid pervious wrapper 23. Secured at one end of the tampon are a pair of withdrawal strings 24 by which the tampon can be withdrawn subsequent to use.
  • the absorbent fibrous core has about 12 percent by weight, based on the total weight, of the aforedescribed hydrocolloidal absorbent composition 20 dispersed therein.
  • FIG. 9 is an enlarged cross section taken along line 9 9 of FIG. 8 and shows the particulate hydrocolloid 20 impregnated in the fibrous absorbent core 22 which is encased by the liquid pervious wrapper 23.
  • FIGS. I0 and I! are planar views of other tampon constructions before the same are formed into tampons.
  • an absorbent covering sheet 30 fonns the base for the layer 31 of the aforedefined hydrocolloidal absorbent and the absorbent positioning-sheet 32.
  • Both sheets 30 and 32 are of nonwoven construction and are liquid permeable; however, other liquid absorbent mediums could be utilized, i.e., paper or woven textiles, etc., and it is conceivable that apertured or foraminous nonabsorbent sheets, e.g., apertured polyethylene film, could be substituted for one or the other.
  • the tampon construction of FIG. 10 is formed by turning either of the longitudinal edges over on itself and continuing to so roll the edge to provide a cylindrical tampon. The cylindrical tampon is then compressed and the free longitudinal edge adhesively secured. The same applies to the tampon of FIG. 11, and in each instance the arrows describe the method of forming. Each tampon has withdrawal strings 33 secured by stitching 34 or other suitable means to the composite.
  • a tampon formed of the embodiment shown in FIG. 11 is given in F 1G. 12. The center portion of the tampon is cut away to show the distribution and positioning of materials.
  • sample dressings of the instant invention exhibit greatly improved absorption and retention of liquids.
  • sample dressings were prepared as follows: A plurality of l X l0 inch test absorbent dressings were constructed by superimposing in congruent relationship, layers of nonwoven fabric 26, fluffed wood pulp 27 and a hydrocolloidal composition 28 as is shown in cross section in FIG. 13. Each sheet of nonwoven fabric weighed 1 gram, each layer of pulp weighed 3.3 grams and each layer of hydrocolloidal absorbent composition weighted 0.5 grams.
  • a control dressing similarly constructed contained no hydrocolloidal absorbent composition.
  • Each dressing or pad was saturated with 500 milliliters of deionized water. Each pad was inclined at an angle of about 45 for 3 minutes and the water that escaped from each pad or dressing was separately collected and measured.
  • the absorbent dressing of this invention also maintains a reduced, or minimal, surface w etness on the facing sheet, i.e., the sheet of textile or paper-like material positioned contiguous to the skin of the user, or in the alternative the sheet of the dressing exposed directly to the source of the liquid which the dressing is intended to absorb.
  • This feature is dramatically established by the following test utilizing two diapers of identical construction. Each diaper measured X 10 inches and the weight of the absorbent facing and backing sheets was 200 grains per square yard. Each diaper had a layer of fluffed wood pulp in an amount of l2 grams; however, only one diaper had 1.5 grams of a crosslinked hydrolyzed polyacrylamide dispersed within the absorbent fibrous layer.
  • n, m, Z and Y of this crosslinked hydrolyzed polyacrylamide were 28, 72, 10 and Na respectively (which apply to the structural formula on page 4) and the crosslinking agent was methylene bis acrylamide. 150 ml of deionized water was added to each of the horizontally positioned diapers. Diaper A contained the hydrocolloidal composition and diaper 8 did not.
  • the facing sheet of each diaper was carefully removed and weighed to determine its liquid content.
  • FIG. I of this invention Another very important feature that is characteristic of the absorbent dressing of this invention is the reduced internal spread of absorbed liquid that it exhibits.
  • diapers constructed in accordance with FIG. I of this invention were prepared.
  • Fifty cubic centimeters (cc) of colored water was introduced onto the center of each of these diapers constructed in accordance with FIG. 1.
  • the diapers contained either 0 percent, 16 percent or 3
  • An absorbent dressing comprising an absorbent layer sandwiched between a liquid permeable facing sheet and a backing sheet, said absorbent layer containing at least about 5 percent by weight, based on the total weight of the dre ing, of a hydrocolloidal polymer composition rendered substantially water insoluble by crosslinking, and having from about 25 to about 72 percent of its molecular structure composed of hydrophillic groups, said hydrocolloidal composition being further defined as providing a gelatinous agglomerate of liquid-swollen particulate members in the presence of a quantity of body exudate, as capable of absorbing at least about 15 times its weight in body exudate, as capable of retaining said absorbed exudate under a pressure of up to about 2.5 p.s.i., and as having a minimum average molecular weight per crosslinkage of about I 3,000.
  • hydrocolloidal composition is selected from the group consisting of croslinked polystyrene sulfonate and crosslinked polyacrylamide.
  • a disposable diaper comprising absorbent layers sandwiched between a liquid permeable facing sheet and a liquid permeable backing sheet, said absorbent layer containing at least about 5 percent by weight, based on the total weight of the diaper, of a hydrocolloidal polymer composition rendered substantially water insoluble by crosslinking, and having from about 25 to about 72 percent of its molecular structure composed of hydrophillic groups, said hydrocolloidal composition being further defined as providing a gelatinous agglomerate of liquid-swollen particulate members in the presence of body exudate, as capable of absorbing at least about 15 times its own weight in body exudate, as capable of retaining said absorbed exudate under a pressure of up to about 2.5 psi, and as having a minimum average molecular weight per crosslinkage of about 13,000.
  • Z is a number from I00 to 3,000 and defines the number of mer units between crosslinks
  • Y is a member of the group consisting of hydrogen, ammonium, and an alkali metal ion.
  • hydrocolloidal composition is selected from the group consisting of crosslinked polystyrene sulfonate and crosslinked polyacrylamide.
  • a flexible support adapted to be caused to conform to a surface of an animal body, said support confining a dry, solid, water-swellable, water-insoluble, physiologically unobjectionable polymeric sorbent so as to present said sorbent for the sorption of aqueous fluid elaborated by the animal to which said article is applied and said polymeric sorbent being a lightly crosslinked polymer and being selected from the group consisting of polystyrene-sulfonate, and alkali metal salts thereof as contain sulfonate or carboxylate groups.
  • An absorbent dressing comprising an absorbent layer sandwiched between a liquid permeable facing sheet and a backing sheet, said absorbent layer containing a hydrocolloidal polymer composition rendered substantially water-in-' soluble by crosslinking, and having from about 25 to about 72 percent of its molecular structure composed of hydrophilic groups, said hydrocolloidal compositions being further defined as providing a gelatinous agglomerate of liquid-swollen particulate members in the presence of a quantity of body exudate, as capable of absorbing at least about fifteen times its weight in body exudate, as capable of retaining said absorbed exudate when exposed to pressure suificient to deform said agglomerate and as having a degree of cross-linking within the range of the de ees of crosslinking obtained by co l erizing a mono-ole nic monomer with from about 0.0 to about 0.5 percent by weight of a divinyl compound.
  • hydrocolloidal composition is selected from the group consisting of polyacrylamide, alkali metal salts of hydrolyzed polyacrylamides and the free acid and alkali metal salts of polystyrene sulfonates.

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  • Engineering & Computer Science (AREA)
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  • Public Health (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Epidemiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Hematology (AREA)
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  • Dispersion Chemistry (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Materials For Medical Uses (AREA)
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US551772A 1966-05-20 1966-05-20 Absorbent product containing a hydrocolloidal composition Expired - Lifetime US3670731A (en)

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JPS5231113B1 (ja) 1977-08-12
GB1192581A (en) 1970-05-20
DE1642072B2 (de) 1976-03-04
DE1642072A1 (de) 1971-04-22
NL6710515A (ja) 1969-01-30

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