# US 10,767,280 B2 · High-permeability cellulose fibers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,280 B2 - Document ID: US10767280B2 - Status: Granted - Kind: B2 - Application number: 14/776,351 - Filed: 2014-03-14 - Published: 2016-02-04 - Granted: 2020-09-08 - Earliest claimed: 2013-03-15 - Assignees: GP Cellulose GmbH - Applicants: Gp Cellulose GmbH - Inventors: Alan Jeffrey Campbell; Sonja McNeil Fields; Danny R. Moore; Stephen Skirius - Web page: https://patentgrep.com/patent/US10767280B2 ## CPC - D01F 2/24: from cellulose derivatives - C08B 16/00: Regeneration of cellulose - D06M 11/38: Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table - D21C 9/001: {Modification of pulp properties (purification D21C9/08)} - D21C 9/002: {by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives} - D21H 11/20: Chemically or biochemically modified fibres - D21H 27/002: {Tissue paper; Absorbent paper (D21H21/22, D21H27/02, D21H27/20 take precedence; toilet paper A47K10/00; absorbent pads for physiological fluids A61L15/16; making on paper-making machines D21F11/00)} - D21H 27/08: Filter paper (self-supporting filtering material B01D39/14; making on paper-making machines D21F11/14) - D21H 27/10: Packing paper (packaging materials of special type or form B65D65/38) - D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS - C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21) - D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS - D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR ## Abstract High permeability curly fibers with enhanced fiber strength are produced by mercerizing cellulosic fibers. The fibers have relatively high values for curl, kink level, wet tensile strength, and bulk density when compared with current fibers. The disclosed fibers can be used in a wide range of applications including paper products such as filters. ## Claims ### Claim 1 A fibrous structure comprising mercerized cellulose fiber having: (a) an x-ray diffraction coefficient of at least about 0.58; (b) a curl of at least about 38%; (c) a kink level of at least about 3200 kinks per meter; and (d) a length-weighted fiber length of at least about 1.9 mm, wherein the fibrous structure has a wet tensile of at least 60 N/cm at 1000 revs refining and an air permeability of at least 400 cfm/ft2 at 0 revs refining. ### Claim 2 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has a curl of at least about 40%. ### Claim 3 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has a curl of at least about 42%. ### Claim 4 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has a curl of at least about 43%. ### Claim 5 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has a kink level of at least about 3300 kinks per meter. ### Claim 6 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has a kink level of at least about 3400 kinks per meter. ### Claim 7 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has a kink level of at least about 3500 kinks per meter. ### Claim 8 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has an x-ray diffraction coefficient of at least about 0.62. ### Claim 9 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has an x-ray diffraction coefficient of at least about 0.65. ### Claim 10 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has an x-ray diffraction coefficient of at least about 0.68. ### Claim 11 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has an S-10 level of less than about 4% when steeped in a 10% NaOH solution. ### Claim 12 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has an S-10 level of less than about 3.4% when steeped in a 10% NaOH solution. ### Claim 13 (depends on 1) The fibrous structure of claim 1, wherein the fibrous structure has a wet tensile of at least about 63 N/cm at 1000 revs refining. ### Claim 14 (depends on 1) The fibrous structure of claim 1, wherein the fibrous structure has a wet tensile of at least about 65 N/cm at 1000 revs refining. ### Claim 15 (depends on 1) The fibrous structure of claim 1, wherein the fibrous structure has a wet tensile of at least about 65.5 N/cm at 1000 revs refining. ### Claim 16 (depends on 1) The fibrous structure of claim 1, wherein the fibrous structure has a wet tensile of at least about 68 N/cm at 1000 revs refining. ### Claim 17 (depends on 1) The fibrous structure of claim 1, wherein the fibrous structure has a tensile strength of at least about 110 g/in at 500 revs refining. ### Claim 18 (depends on 1) The fibrous structure of claim 1, wherein the fibrous structure has a tensile strength of at least about 370 g/in at 500 revs refining. ### Claim 19 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has a dust level of less than about 12.75%. ### Claim 20 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber has a dust level of less than about 7.0%. ### Claim 21 (depends on 1) The fibrous structure of claim 1, wherein the mercerized cellulose fiber maintains structural integrity.