# US 5,346,485 A · Polymeric composition for the absorption of proteinaceous fluids > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,346,485 A - Document ID: US5346485A - Status: Granted - Kind: A - Application number: 08/056,222 - Filed: 1993-04-30 - Granted: 1994-09-13 - Earliest claimed: 1990-05-07 - Assignees: Kimberly-Clark Corporation - Inventors: Sandra M. Yarbrough; Ramakant T. Shet; Ronald S. Harland - Web page: https://patentgrep.com/patent/US5346485A ## CPC - A61L 15/60: Liquid-swellable gel-forming materials, e.g. super-absorbents - 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 (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) ## Abstract A polymeric composition specifically adapted to absorb blood and other proteinaceous fluids and having repeating units, said polymeric composition comprising pendant neutralized carboxyl groups (salts) and pendant carboxyl groups. The polymeric composition is characterized in that the ratio of pendant neutralized carboxyl groups to pendant carboxyl groups is within the range of from about 1:9 to about 9:11, at least about 20 mole percent of the repeating units comprise a pendant neutralized carboxyl group or a pendant carboxyl group, and at least about 50 percent of the pendant neutralized carboxyl groups have been neutralized with a potassium or lithium base. ## Claims ### Claim 1 A blood-swellable, generally blood-insoluble polymeric composition comprising: at least about 20 mole percent based on said polymeric composition of a polymerized carboxyl group-containing monomer; and a crosslinking agent, said polymeric composition being characterized in that: (a) it has a degree of neutralization within a range of from about 10 to about 45 mole percent of said carboxyl groups, (b) at least 50 percent of the neutralized carboxyl groups are neutralized with a potassium or lithium base. ### Claim 2 (depends on 1) The polymeric composition according to claim 1 wherein said carboxyl group-containing monomer is selected from the group consisting of olefinically unsaturated acids and acid anhydrides which contain at least one carbon-to-carbon double bond and the associated slat monomers. ### Claim 3 (depends on 2) The polymeric composition according to claim 2 wherein said carboxyl group-containing monomer is acrylic acid. ### Claim 4 (depends on 1) The polymeric composition according to claim 1 wherein said polymeric composition is in a form of non-agglomerated, solid particles. ### Claim 5 (depends on 4) The polymeric composition according to claim 4 wherein said polymeric particles have an average maximum cross-sectional dimension within the range of from about 150 to about 300 microns. ### Claim 6 (depends on 1) The polymeric composition according to claim 1 wherein at least about 80 percent of said neutralized carboxyl groups are neutralized with a potassium or lithium base. ### Claim 7 (depends on 6) The polymeric composition according to claim 6 wherein at least about 95 percent of said neutralized carboxyl groups are neutralized with a potassium or lithium base. ### Claim 8 (depends on 1) The polymeric composition according to claim 1 wherein said polymeric composition comprises at least about 50 mole percent of a polymerized carboxyl group-containing monomero. ### Claim 9 (depends on 8) The polymeric composition according to claim 8 wherein said polymeric composition comprises at least about 90 mole percent of a polymerized carboxyl group-containing monomer. ### Claim 10 A blood-swellable, generally blood-insoluble polymeric composition, said composition comprising: at least about 50 mole percent of a polymerized acrylic acid monomer; and a crosslinking agent; said polymeric composition being characterized in that it has a 6-minute bovine blood absorption capacity of at least about 14 grams per gram, a 60-minute bovine blood absorption capacity of at least about 40 grams per gram, and a degree of neutralization between about 10 and about 45 mole percent of said carboxyl groups, wherein at least about 80 percent of the neutralized carboxyl groups, are neutralized with a potassium or lithium base. ### Claim 11 An absorbent product for the absorption of proteinaceous body fluids, the product comprising: an outer moisture-impermeable cover; a body side liner superposed in facing relation to said outer cover and adapted to contact the skin of a wearer; and an absorbent structure located therebetween, said absorbent structure comprising a blood-swellable, generally blood-insoluble polymeric composition comprising: at least about 20 mole percent based on said polymeric composition of a polymerized carboxyl group-containing monomer; and a crosslinking agent; said polymeric composition being characterized in that: (a) it has a degree of neutralization within a range of from about 10 to about 45 mole percent of said carboxyl groups, (b) at least 50 percent of the neutralized carboxyl groups are neutralized with a potassium or lithium base. ### Claim 12 (depends on 11) The absorbent product according to claim 11 wherein said absorbent structure further comprises an absorbent matrix of fibers in which said polymeric composition is dispersed in the form of solid, non-agglomerated discrete particles. ### Claim 13 (depends on 11) The absorbent product according to claim 11 wherein said absorbent matrix of fibers comprises a mixture of cellulosic fibers and meltblown synthetic polymeric fibers. ### Claim 14 (depends on 11) The absorbent product according to claim 11 wherein said carboxyl group-containing monomer is selected from the group consisting of acrylic acid, methacrylic acid, and mixtures thereof. ### Claim 15 (depends on 14) The absorbent product according to claim 14 wherein said carboxyl group-containing monomer is acrylic acid. ### Claim 16 (depends on 15) The absorbent product according to claim 15 wherein said polymeric composition has a degree of neutralization within the range of from about 25 mole percent to about 45 mole percent. ### Claim 17 (depends on 11) The absorbent product according to claim 11 wherein said polymeric composition has a 6-minute bovine blood absorption capacity of at least about 14 grams per gram. ### Claim 18 (depends on 11) The absorbent product according to claim 11 wherein said polymeric composition has a 60-minute bovine blood absorption capacity of at least about 40 grams per gram.