# US 7,608,167 B2 · Crosslinked carboxyalkyl cellulose fibers having permanent and non-permanent crosslinks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,167 B2 - Document ID: US7608167B2 - Status: Granted - Kind: B2 - Application number: 11/537,881 - Filed: 2006-10-02 - Published: 2008-04-03 - Granted: 2009-10-27 - Earliest claimed: 2006-10-02 - Assignees: Weyerhaeuser NR Company - Inventors: Mengkui Luo; S. Ananda Weerawarna; Jian Qin; James H Wiley - Web page: https://patentgrep.com/patent/US7608167B2 ## CPC - D21C 9/002: {by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives} - A61F 13/53: characterised by the absorbing medium (A61F13/20 takes precedence) - A61L 15/28: Polysaccharides or their derivatives {(A61L15/225 takes precedence)} - A61L 15/60: Liquid-swellable gel-forming materials, e.g. super-absorbents - A61F 2013/530051: {being made in cross-linked cellulosic fibres} - A61F 2013/530613: {in fibres} - D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR - 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 (dental prosthetics A61C) - 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 Substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers, wherein the fibers have a surface having the appearance of the surface of a cellulose fiber, and wherein the fibers include a plurality of non-permanent intra-fiber metal crosslinks and a plurality of permanent intra-fiber crosslinks; and fiber bundles that include the fibers. ## Claims ### Claim 1 Substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers, wherein the fibers have a surface having the appearance of the surface of a cellulose fiber, and wherein the fibers comprise a plurality of non-permanent intra-fiber metal crosslinks and a plurality of permanent intra-fiber crosslinks. ### Claim 2 (depends on 1) The fibers of claim 1, wherein the non-permanent intra-fiber metal crosslinks comprise multi-valent metal ion crosslinks. ### Claim 3 (depends on 2) The fibers of claim 2, wherein the multi-valent metal ion crosslinks comprise one or more metal ions selected from the group consisting of aluminum, boron, bismuth, titanium, zirconium, cerium, and chromium ions, and mixtures thereof. ### Claim 4 (depends on 1) The fibers of claim 1, wherein the non-permanent intra-fiber metal crosslinks comprise aluminum ions. ### Claim 5 (depends on 1) The fibers of claim 1, wherein the permanent intra-fiber crosslinks are selected from the group consisting of ether cross links and ester crosslinks. ### Claim 6 (depends on 1) The fibers of claim 1, wherein the permanent intra-fiber crosslinks comprise covalent crosslinks formed from an organic compound having at least two functional groups capable of reacting with at least one functional group selected from the group consisting of carboxyl, carboxylic acid, and hydroxyl groups. ### Claim 7 (depends on 6) The fibers of claim 6, wherein the organic compound is 1,3-dichloro-2-propanol. ### Claim 8 Substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers, wherein the fibers have a surface having the appearance of the surface of a cellulose fiber, and wherein the fibers comprise a plurality of non-permanent intra-fiber metal crosslinks and a plurality of permanent intra-fiber crosslinks, wherein the permanent intra-fiber crosslinks comprise covalent crosslinks formed from 1,3-dichloro-2-propanol. ### Claim 9 (depends on 8) The fibers of claim 8, wherein the non-permanent intra-fiber metal crosslinks comprise multi-valent metal ion crosslinks. ### Claim 10 (depends on 9) The fibers of claim 9, wherein the multi-valent metal ion crosslinks comprise one or more metal ions selected from the group consisting of aluminum, boron, bismuth, titanium, zirconium, cerium, and chromium ions, and mixtures thereof. ### Claim 11 (depends on 8) The fibers of claim 8, wherein the non-permanent intra-fiber metal crosslinks comprise aluminum ions. ### Claim 12 A fiber bundle, comprising a plurality of substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers, wherein the fibers have a surface having the appearance of the surface of a cellulose fiber, and wherein the fibers comprise a plurality of non-permanent intra-fiber metal crosslinks and a plurality of permanent intra-fiber crosslinks. ### Claim 13 (depends on 12) The fiber bundle of claim 12, wherein the non-permanent intra-fiber metal crosslinks comprise multi-valent metal ion crosslinks. ### Claim 14 (depends on 13) The fiber bundle of claim 13, wherein the multi-valent metal ion crosslinks comprise one or more metal ions selected from the group consisting of aluminum, boron, bismuth, titanium, zirconium, cerium, and chromium ions, and mixtures thereof. ### Claim 15 (depends on 12) The fiber bundle of claim 12, wherein the non-permanent intra-fiber metal crosslinks comprise aluminum ions. ### Claim 16 (depends on 12) The fiber bundle of claim 12, wherein the permanent intra-fiber crosslinks are selected from the group consisting of ether crosslinks and ester crosslinks. ### Claim 17 (depends on 12) The fiber bundle of claim 12, wherein the permanent intra-fiber crosslinks comprise covalent crosslinks formed from an organic compound having at least two functional groups capable of reacting with at least one functional group selected from the group consisting of carboxyl, carboxylic acid, and hydroxyl groups. ### Claim 18 (depends on 17) The fiber bundle of claim 17, wherein the organic compound is 1,3-dichloro-2-propanol.