EP0200784A1 - Mehrschichtige absorbierende erzeugnisse - Google Patents

Mehrschichtige absorbierende erzeugnisse

Info

Publication number
EP0200784A1
EP0200784A1 EP19850905971 EP85905971A EP0200784A1 EP 0200784 A1 EP0200784 A1 EP 0200784A1 EP 19850905971 EP19850905971 EP 19850905971 EP 85905971 A EP85905971 A EP 85905971A EP 0200784 A1 EP0200784 A1 EP 0200784A1
Authority
EP
European Patent Office
Prior art keywords
percent
cross
liquid
layer
starch
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.)
Withdrawn
Application number
EP19850905971
Other languages
English (en)
French (fr)
Inventor
James G. Mitchell
Winalee G. Mitchell
Robert E. Strauss
Richard L. Jacobs
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.)
TRANQUILITY PRODUCTS INTERNATIONAL Inc
Original Assignee
TRANQUILITY PRODUCTS INTERNATIONAL Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TRANQUILITY PRODUCTS INTERNATIONAL Inc filed Critical TRANQUILITY PRODUCTS INTERNATIONAL Inc
Publication of EP0200784A1 publication Critical patent/EP0200784A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • A61F13/53409—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 having a folded core
    • A61F13/53436—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 having a folded core having an undulated or corrugated cross-section
    • 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
    • A61F13/53—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
    • A61F13/534—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
    • A61F13/537—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • 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
    • 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
    • A61F13/51—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 outer layers of the pads
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51409—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a film
    • 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
    • A61F2013/530131—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 being made in fibre but being not pulp
    • 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
    • A61F2013/530802—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 characterized by the foam or sponge other than superabsorbent
    • 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
    • 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
    • A61F13/537—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F2013/53765—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry
    • A61F2013/53782—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry with holes
    • 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
    • A61F13/537—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F2013/53765—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry
    • A61F2013/53786—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry with folds
    • 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
    • A61F2013/53908—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 with adhesive

Definitions

  • This invention relates to multi-layered absorbent products, for example, diapers, which contain a superabsorbent composition.
  • the absorbent product comprises a liquid pervious body-contacting layer, a liquid impervious layer and one or more liquid absorbent layers therebetween.
  • U.S. Patent No. 4,144,886, granted March 20, 1979 to Arno Hoist et al. discloses an absorbent laminate comprising a first absorbent layer, preferably, a cellulose flock layer, and a tissue layer which has a coating of an absorbent carbohydrate derivative on at least one surface and a body-contacting layer comprising fleece.
  • the tissue layer is positioned between the fleece and the cellulose flock layer.
  • the ' carbohydrate derivative comprises cross-linked cellulose ethers or starch grafted with acrylonitrile and subsequently saponified.
  • U.S. Patent No. 3,888,256, granted June 20, 1975 to Han ⁇ Studinger discloses a layered absorbent pad comprising an absorbent layer disposed between upper and lower surface layers.
  • the absorbent layer may comprise -a particulate swelling . subs tance adhered to a liquid-pervious carrier or support sheet;.
  • the only swelling substances disclosed by the reference are- polyacrylamide and sulfonated polystyrene.
  • An essential feature of the invention disclosed by this reference is that the particles of swelling substance are distributed on the carrier sheet such that they are spaced from one another a distance less than one-half the increase in diameter which occurs upon swelling thereof .
  • a coramercllly available diaper which was sold under the trade designation "Depends" prior to November 2, 1984, comprised a water imp ervious layer which , in lite, was positioned away from the wearer' s body, a layer of tissue which carried a water swellable substance and a fluff layer, in the recited order .
  • the diaper further comprised an envelope composed of a water pervious , non- woven material.
  • a more recent diaper sold under the indicated trade designation comprises a water impervious layer which, in use, is positioned away from the wearer' s body and a fluff layer which , on its s ide adjacent the water impervious layer -'.as as s embled in the f inal product, is impregnated with - -water swellable substance.
  • the instant invention is based upon the discovery of an improved multi-layered disposable product comprising a liquid pervious body-contacting layer, a fluff layer, at least one layer of a tissue having a liquid-absorbent composition thereon and a water impervious layer. According to the invention, the tissue layer is positioned between the body-contacting layer and the fluff layer.
  • the liquid-absorbent composition is a superabsorbent polymer or copolymer consisting of a cross-linked acrylic polymer, a cross- linked acrylic copolymer or a carboxymethyl cellulose polymer.
  • a preferred superabsorbent is a water-absorbing resin produced by polymerizing (1) at least one unsaturated monomer which has a single polymerizable double bond and which is water soluble or becomes water soluble by hydrolysis, and (2) a cross-linking agent, and, if the unsaturated monomer (1) is one which becomes water soluble by hydrolysis, thereafter subjecting the resulting product to hydrolysis.
  • Another preferred superabsorbent is a water-absorbing resin produced by polymerizing (1) at least one of natural starch and alpha starch, (2) at least one monomer which has a single polymerizable double bond and which is water soluble or becomes water soluble by hydrolysis, and (3) a cross-linking agent, and, if the monomer (2) is one which becomes water soluble by hydrolysis, thereafter subjecting the resulting product to hydrolysis.
  • a particularly preferred, superabsorbent comprises a blend of water-absorbing resins consisting of at least one cross- linked acrylic polymer and at least one cross-linked copolymer
  • Figure 1 is a cross-sectional view of a multi-layer absorbent pad in accordance with the instant invention.
  • Figure 2 is a cross-sectional view of a second embodiment of a multi-layer absorbent pad according to the instant invention.
  • Figure 3 is a cross-sectional view of a third embodiment of a multi-layer absorbent pad according to the instant invention.
  • Figure 4 is a plot of experimentally determined absorbtion ranges for two different polymers and blends of the two.
  • an embodiment of an absorbent pad according to the instant invention is indicated generally at 10.
  • a non-woven water- pervious cover 11 On the exterior of the absorbent pad 10 is a non-woven water- pervious cover 11, which may be formed from a flat sheet of a non- woven material which is folded around the other components of the absorbent pad 10.
  • the bond at 12 is on a side 15 of the absorbent pad 10, which, in use, would be positioned away from the body of the user.
  • the absorbent pad 10 further comprises a cover layer 16 composed of water impervious material, a fluf-f layer 17 and one or more layers of a superabsorbent laminate 18 which is enveloped by a cover 19 composed of tissue.
  • the fluff layer 17 is bonded to the water impervious layer 16 by an adhesive indicated generally at 20.
  • Suitable adhesives are available from Ecomelt A.G. as "adhesives for the sanitary industry.” Hot melt, multi-bead formulations are preferred, for example ones available from Ecomelt under the designations H-101, H-110, H-115, H-201, H-210, H-301, H-310 and H-312.
  • the laminate 18 comprises a tissue with particles of a superabsorbent carboxymethyl cellulose polymer, cross-linked acrylic polymer, or cross-linked acrylic copolymer fixed on the surface thereof.
  • the laminate 18, as shown in Figure 1, can be pleated. It has been found that pleating increases the rate of absorbency exhibited by the laminate 18. It will be appreciated, however, that the laminate 18 can be in the form of a flat sheet or sheets.
  • flaps 21 are partially punched out of the laminate 18 to produce openings 22 therein. It has been found that the provision of openings 22 increases the rate at which liquids are absorbed by the pad 10.
  • the tissue portion of the laminate 18 can be a high wet-strength tissue or a low wet- strength tissue; the former is ⁇ preferred unless the pad 10 is to be flushable in which case the tissue should be of the low wet- strength type.
  • the second embodiment of the Instant invention is a pad indicated generally at 30 in Figure 2.
  • a water-pervious non-woven layer 31 is provided on a side 32 of the absorbent pad 30. Edges 33 and 34 of the water-pervious layer 31 are adhered to edges 35 and 36 of a water impervious layer 37 « The superabsorbent laminate 18 surrounded by the covering of tissue 19, substantially as described hereinabove with reference to Figure 1, is incorporated in the absorbent pad 30.
  • a fluff layer 39 Adjacent to the water impervious layer 37, there is a tissue layer 38. Between the superabsorbent laminate 18 and the tissue layer 38, there is a fluff layer 39.
  • the tissue layer 38 is adhesively bonded to the water impervious layer 37 by an adhesive layer 40.
  • the fluff layer 39 is bonded to the tissue, layer 38 by adhesive indicated generally at 41.
  • a third embodiment of the instant invention is an absorbent pad indicated generally at 0 ( Figure 3), and comprising a water- pervious non-woven cover 51, a water impervious layer 52 and a fluff layer 53.
  • a side 54 of the fluff layer 53 is impregnated with particles of at least one superabsorbent polymer or copolymer which is further described hereinafter.
  • the fluff layer with the particles is enveloped by a sheet 55 of wet-strength tissue and the absorbent pad 50 is assembled so that the superabsorbent particles are positioned away from the water impervious layer 52.
  • the non-woven water-pervious layer 51 can completely surround the rest of the absorbent pad 50.
  • the non-woven water-pervious layer can be bonded to the water impervious- layer 52 as described above in connection with the absorbent pad ' 30 ( Figure 2).
  • the non-woven water-pervious cover 11 ( Figure 1) can be bonded to the water impervious layer 16.
  • the covers ( Figures 1 and 2) composed of tissue need not completely envelope the superabsorbent laminate 18.
  • at least one layer of tissue preferably wet-strength, is provided between the superabsorbent laminate 18 and a portion of the water-pervious cover 11 ( Figure 1) and 31 ( Figure 2), which portion, in use, would contact the body of the user.
  • This layer of tissue is essential to facilitate wicking of fluids deposited in one place on the pad 10 ( Figure 1) and 30 ( Figure 2).
  • Such wicking enables full utilization of the absorbent capacity of the superabsorbent laminate 18 by carryingizids to portions thereof remote from the place where they (the fluids) are deposited.
  • the laminate 18 comprises a tissue with particles of at least one superabsorbent polymer fixed on the surface thereof.
  • the polymer is one which is capable of absorbing at least 20 ml of a 1 percent by weight aqueous sodium chloride solution per gram of polymer.
  • one gram of the polymer is operable to absorb at least 40 ml of a 1 percent by weight aqueous sodium chloride solution.
  • the polymer is a carboxymethyl cellulose polymer, a cross-linked acrylic polymer or a cross-linked acrylic-starch graft copolymer having the absorbtion capacity recited above.
  • Compounds suitable for cross- linking acrylic compounds are well known in the chemical arts and are disclosed in U.S. patent Nos. 3,332,901, 3,224,986 and 2,926,154.
  • Suitable cross-linked acrylic polymers and copolymers and methods for producing them are disclosed in U.S. patent Nos. 4,117,184 and 4,076,673 *
  • Such polymers and copolymers are all suitable in structures according to the instant invention, provided that they have the Indicated absorbtion capacity.
  • a preferred polymer is a cross-linked acrylic polymer produced by polymerizing (1) at least one unsaturated monomer which has a single polymerizable double bond and which is water soluble or becomes water soluble by hydrolysis, and (2) a cross- linking agent, and, if the unsaturated monomer (1) is one which becomes water soluble by hydrolysis, thereafter subjecting the resulting product to hydrolysis.
  • the polymer is one which is operable to absorb at least 40 ml of a 1 percent by weight aqueous sodium chloride solution per gram of polymer and which is further operable to absorb at least 9 ml per gram of polymer per minute of a 1 percent by weight aqueous sodium chloride solution.
  • One such preferred acrylic polymer is commercially available from Grain Processing Corporation, Muscatine, Iowa 52761 under the trade designation J-550. This acrylic polymer has a total absorbency, measured by a test that is subsequently described herein, of 59 ml per g ( illileters per gram).
  • Another preferred- polymer is a cross-linked acrylic-starch graft copolymer produced by polymerizing (1) at least one ⁇ f a natural starch and alpha starch, (2) at least one monomer which has a single polymerizable double bond and which is water soluble or becomes water soluble by hydrolysis, and (3) a cross-linking agent, and, if the monomer (2) is one which becomes water soluble by hydrolysis, thereafter subjecting the resulting product to hydrolysis.
  • the copolymer is one. hich is operable to absorb at least 40 ml of a 1 percent by weight aqueous sodium chloride solution per gram of copolymer.
  • 4,076,673 are representative of this preferred cross-linked acrylic-starch graft copolymer for use according to the instant invention.
  • One such preferred acrylic-starch graft copolymer is commercially available from Sanyo Chemical Industries, Limited, 11-1, Ikkyo Nomoto-cho, Higashlyama-Ku, Kyoto 605, Japan under the trade designation Sanwet IM-1000. This polymer has a total absorbency, measured by the subsequently described test, of 52.
  • a particularly preferred superabsorbent for use in accordance with the instant invention comprises a blend of at least one cross-linked acrylic polymer which is operable to absorb at least 50 ml of a 1 percent by weight aqueous sodium chloride solution per gram of polymer and which is further operable to absorb at least 10 ml per gram of polymer per minute of a 1 percent by weight aqueous sodium chloride solution and at least one cross- linked acrylic-starch graf copolymer which is operable to absorb at least 50 ml of a 1- percent by weight aqueous sodium chloride solution per gram of polymer.
  • the cross-linked acrylic polymer constitutes from 5 percent to 50 percent, based upon the weight of the acrylic polymer and the acrylic-starch copolymer; preferrably.
  • the cross-linked acrylic polymer constitutes from 10 percent to 35 percent; more preferrably from 15 percent to 30 percent on the indicated basis, in both cases.
  • Absorbtion capacities in one minute for 0.2 gram portions of polymer (or blend) were determined using a capillary absorbency test proceedure which comprised: (1) attaching one end of a length of flexible vinyl tubing to a platform of acrylic sheet material constructed to opperably receive it such that the end of the tubing is flush with the platform; (2) attaching the other end of the vinyl tubing to a stopcock which comprises the tip of a graduated burette; (3) securing the platform and the burette in an adjustable stand so that the platform is at essentially the same height or slightly lower than the burette zero ; ( 4 ) filling the burette and the vinyl tubing with a 1 percent by weight sodium chloride solution; (5) closing the burette stopcock and adjusting the liquid level to zero; (6) placing 0.2 g of polymer (or blend) on a Whatman #1 (4.25 cm) filter paper and placing the filter paper on the platform; ( 7 ) opening the burette stopcock for one minute and thereafter recording the liquid level in the burette .
  • the polymer ( o r blend) draws the salt solution through the filter paper against a decreasing negative head .
  • Absorbency is expressed as ml/g where ml is volume of 1% by weight NaCl solution absorbed in milliliters and g is the weight of the sample in grams .
  • Tests conducted as described above on various blends of J-550 and Sanwet IM-1000 resulted in the absorbencles presented in Table 1 , whe rein the rat ios compris ing column headings are percent J-550/percent IM-1000
  • the line connecting points 62 and 65 represents the theoretical average absorbencies of varying blends of the two polymers based on the average absorbency of each when measured alone. In every instance, the experimental average absorbency calculated for each of the blends tested is substantially greater than the theoretical average absorbency for that blend. Similarly, the line between points 61 and 64 in Figure 4 represents the theoretical maximum absorbencies of varying blends. For six of the nine blends tested, the experimental average absorbency is greater than the theoretical maximum absorbency. For the blend comprising 30 percent of the J-550 material and 70 percent of the Sanwet IM-1000 material the entire experimental I? range of absorbencies (calculated to a 95 percent level of certainty) exceeds the maximum theoretical absorbency of that blend.
  • Blends in accordance with the instant invention comprise from 5 percent to 50 percent cross-linked acrylic polymer based on the weight of the acrylic polymer and the acrylic-starch coplymer, preferably from 10 percent to 35 percent cross-linked acrylic polymer, more preferably from 15 percent to 30 percent cross-linked acrylic polymer on the indlcayed basis, in both cases.
  • the total absorbencies , ml per g, of the foregoing materials were Akucell 3019 33, Favor SAB-901 56 , Arasorb C 47 and A-100 37.
  • the absorbencies , ml per g per minute were 9 * 15 , Favor SAB-901 5.40, Arasorb C 9 - 85 and A-100 4.95.
  • J-550/Akucell 3019 100/0, 67/33, 33/67, 0/100 J-550/Favor SAB-901 100/0, 67/33, 33/67, 0/100 IM-1000/Akucell 3019 100/0, 95/5, 80/20, 65/35, 0/100.
  • Arasorb C/IM-1000 100/0, 90/10, 80/20, 70/30, 60/40, 50/50,
  • Total absorbencies were determined by placing one gram portions of the polymer under investigation in a beaker containing 100 ml 1 percent by weight aqueous sodium chloride solution, gravity filtering solids from the material in the beaker after thirty minutes of standing under ambient conditions, about 20 degrees C, with periodic stirring, and weighing the filter paper and the precipitate thereon. Filtration was through a previously weighed Whatman #1 filter paper. Total absorption was the weight of the filter paper and the precipitate thereon minus the sum of nine and the original weight of the filter paper, it having been found that the filter paper retains nine ml of the aqueous sodium chloride solution.
  • the blend is of a cross-linked acrylic polymer having a total absorbency of substantially 59 ml pe r g and a rate of absorbency of substantially 10.5, and of a cross-linked, starch- acrylic graft copolymer having a total absorbency of substantially 52.
  • both the acrylic polymer and the starch graft must be non-toxic when used in personal care products; this is true of the J-550 and of the IM-1000 materials.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
EP19850905971 1984-11-02 1985-11-01 Mehrschichtige absorbierende erzeugnisse Withdrawn EP0200784A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US66781184A 1984-11-02 1984-11-02
US71732085A 1985-03-29 1985-03-29
US717320 1985-03-29
US667811 1996-06-20

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KR100241823B1 (ko) * 1991-12-18 2000-02-01 스프레이그 로버트 월터 흡수 제품용 액체 조절 부재
US5514120A (en) * 1991-12-18 1996-05-07 Minnesota Mining And Manufacturing Company Liquid management member for absorbent articles
USH1511H (en) * 1992-09-10 1995-12-05 Chappell; Charles W. Absorbent articles having improved longitudinal fluid movement
US5728446A (en) * 1993-08-22 1998-03-17 Johnston; Raymond P. Liquid management film for absorbent articles
DE4422956A1 (de) * 1994-06-30 1996-01-04 Schickedanz Ver Papierwerk Absorbierender Hygieneartikel zur Aufnahme von Körperflüssigkeiten
US6548147B1 (en) 1995-06-30 2003-04-15 Kimberly-Clark Worldwide, Inc. Apparatus and process for producing a corrugated web and an absorbent article comprising a corrugated web
DE69421613T3 (de) † 1994-08-01 2004-09-23 The Procter & Gamble Company, Cincinnati Absorbierende Struktur mit einer oberen Lage und einer unteren Lage aus absorbierendem Gel und Verfahren zur Herstellung
NZ329313A (en) * 1996-12-12 1998-10-28 Mcneil Ppc Inc Stabilised absorbent article
BR9911404A (pt) 1998-06-29 2001-03-20 Procter & Gamble Artigo absorvente descartável adaptado para ser aplicado à região perianal do usuário para receber fezes
US5998695A (en) * 1998-06-29 1999-12-07 The Procter & Gamble Company Absorbent article including ionic complexing agent for feces
US6018093A (en) * 1998-06-29 2000-01-25 The Procter & Gamble Company Absorbent article including a calcium-based feces modification agent
EP1281633A1 (de) * 2001-08-03 2003-02-05 Technicor Inc. Absorbierende oder adsorbierende Kompresse
EP2410882A4 (de) 2009-03-27 2014-05-21 Eulie Llc Funktionsfasern, daraus hergestellte schutzkleidung und herstellungsverfahren dafür
EP2621432A1 (de) * 2010-09-27 2013-08-07 Dear Kate, Inc. Funktionsfasern, daraus hergestellte schutzkleidung und herstellungsverfahren dafür
CN110662519A (zh) * 2017-04-19 2020-01-07 杨百翰大学 用于尿布的折纸图案

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US4338371A (en) * 1980-12-24 1982-07-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Absorbent product to absorb fluids
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