ABSORBENT PRODUCT CONTAINING A HYDROCOLLOIDAL COMPOSITION

• US 3,670,731 A
• Filed: 05/20/1966
• Issued: 06/20/1972
• Est. Priority Date: 05/20/1966
• Status: Expired due to Term

• Current Assignee: Carlyle Harmon
• Original Assignee: Carlyle Harmon
• Inventors: Harmon, Carlyle
• Primary Examiner(s): Rosenbaum, Charles F.
• Application Number:
  US04/551,772
• Time in Patent Office: 2,223 Days
• Field of Search: 128/156,284,285,287,290,296 260/47,77.5,88.1 117/136
• US Class Current: 604/368
• CPC Class Codes: A61F 13/01008 characterised by the material
• CPC Class Codes: A61F 13/202 Catamenial tampons A61F13/2022-A61F13/34 take precedence
• CPC Class Codes: A61F 13/206 Tampons made of rolled-up material
• CPC Class Codes: A61F 13/534 having an inhomogeneous composition through the thickness of the pad A61F13/538, A61F13/539 take precedence; homogeneous cores with tissue wrapping A61F13/53
• CPC Class Codes: A61F 13/539 characterised by the connection of the absorbent layers with each other or with the outer layers
• CPC Class Codes: A61F 2013/00251 with macroscopic openings
• CPC Class Codes: A61F 2013/00744 containing non-woven
• CPC Class Codes: A61F 2013/00748 with hydrocolloids or superabsorbers wound bandages with alginate A61F2013/00229; plasters with cyano-acrylic adhesive A61F2013/00459; plasters for treating burn with hydrogel A61F2013/00523; adhesive for plasters, with hydrogel A61F2013/00676; water-based A61F2013/00689; for use on mucosae A61F2013/00714; for use on wounds A61F2013/00719; with absorbent adhesives A61F2013/00757; with fumed silica A61F2013/00787; with viscoelastic oil-elastomer gel A61F2013/00893
• CPC Class Codes: A61F 2013/00859 with macroscopic openings
• CPC Class Codes: A61F 2013/530481 having superabsorbent materials, i.e. highly absorbent polymer gel materials
• CPC Class Codes: A61F 2013/530496 being fixed to fibres
• CPC Class Codes: A61F 2013/53051 being only in particular parts or specially arranged
• CPC Class Codes: A61F 2013/53445 from several sheets
• CPC Class Codes: A61L 15/225 Mixtures of macromolecular compounds
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: C08L 33/26 Homopolymers or copolymers of acrylamide or methacrylamide
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material

Abstract

An absorbent dressing having an absorbent layer defined by water soluble hydrocolloidal composition capable of absorbing of at least about fifteen times its weight of body exudate and retaining said exudate under pressure of up to about 2.5 p.s.i.

Claims

2. The dressing of claim 1 wherein said hydrocolloidal composition is incorporated within a fibrous mass to define said absorbent layer.

3. The dressing of claim 2 wherein said hydrocolloidal composition is selected from the group consisting of crosslinked polystyrene sulfonate and crosslinked polyacrylamide.

4. The absorbent dressing of claim 2 in the form of a catamenial device.

5. 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 p.s.i., and as having a minimum average molecular weight per crosslinkage of about 13,000.

6. The diaper of claim 5 wherein said hydrocolloidal composition is incorporated within a fibrous mass to define the absorbent layer.

7. The diaper of claim 5 wherein said hydrocolloidal is selected from the group consisting of A.

8. The diaper of claim 6 wherein said hydrocolloidal composition is selected from the group consisting of crosslinked polystyrene sulfonate and crosslinked polyacrylamide.

9. As an article of manufacture, 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.

10. 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-insoluble 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 sufficient to deform said agglomerate and as having a degree of cross-linking within the range of the degrees of crosslinking obtained by copolymerizing a mono-olefinic monomer with from about 0.05 to about 0.5 percent by weight of a divinyl compound.

11. The dressing of claim 10 wherein said 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.