# US 10,865,519 B2 · Modified cellulose from chemical fiber and methods of making and using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,519 B2 - Document ID: US10865519B2 - Status: Granted - Kind: B2 - Application number: 15/810,208 - Filed: 2017-11-13 - Published: 2018-05-17 - Granted: 2020-12-15 - Earliest claimed: 2016-11-16 - Assignees: GP Cellulose GmbH - Applicants: GP Cellulose GmbH - Inventors: Arthur J. Nonni; Charles E. Courchene - Web page: https://patentgrep.com/patent/US10865519B2 ## CPC - D21C 9/1057: {Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16} - B01J 23/72: Copper - B01J 23/745: Iron - C08B 15/04: Carboxycellulose, e.g. prepared by oxidation with nitrogen dioxide - D21C 3/26: Multistage processes - D21C 9/10: Bleaching {; Apparatus therefor} - D21C 9/1036: {Use of compounds accelerating or improving the efficiency of the processes} - D21C 9/14: with ClO2 or chlorites - D21C 9/144: {with ClO2/Cl2 and other bleaching agents in a multistage process} - D21C 9/16: with per compounds - D21C 9/163: {with peroxides} - D21H 11/04: Kraft or sulfate pulp - 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)} - D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - 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) - 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 This disclosure relates to improved products containing oxidized cellulose. This disclosure further relates to improved methods of making oxidized cellulose in multi-stage bleaching processes, including, for example, in four-stage and three-stage bleaching processes. This disclosure further relates to products made therefrom, including wipe, tissue, towel, and napkin products. ## Claims ### Claim 1 A method of making an oxidized cellulose comprising: bleaching a cellulosic pulp using a bleaching process consisting of four bleaching stages, wherein at least one stage of the four-stage bleaching process is an oxidizing (OX) stage comprising oxidizing the pulp with at least one peroxide and at least one catalyst under acidic conditions; and wherein the four-stage bleaching process is a sequence chosen from one of D0E(OX)D1, D0ED1(OX), D0(OX)D1(OX), or D0(OX)D1D2. ### Claim 2 (depends on 1) The method according to claim 1, wherein the at least one catalyst comprises at least one of a copper-containing catalyst and an iron-containing catalyst, and wherein the at least one peroxide is hydrogen peroxide. ### Claim 3 (depends on 2) The method according to claim 2, wherein at least one stage of the bleaching process is a carboxylating D stage comprising treating the fiber with a carboxylating agent. ### Claim 4 (depends on 2) The method according to claim 2, wherein the four-stage bleaching process is a sequence chosen from one of D0E(OX)D1 or D0(OX)D1D2. ### Claim 5 (depends on 2) The method according to claim 2, wherein no the four-stage bleaching process is a sequence chosen from one of D0E(OX)D1, D0ED1(OX), D0(OX)D1(OX), or D0(OX)D1D2. ### Claim 6 (depends on 2) The method according to claim 2, wherein the four-stage bleaching process is a sequence chosen from one of D0E(OX)D1, D0(OX)D1(OX), or D0(OX)D1D2 and wherein the at least one oxidizing stage is followed by at least one carboxylating D stage comprising treating the fiber with a carboxylatinq agent. ### Claim 7 (depends on 2) The method according to claim 2, wherein the at four-stage bleaching process is a sequence chosen from one of D0(OX)D1(OX) or D0(OX)D1D2. ### Claim 8 (depends on 2) The method according to claim 2, wherein the four-stage bleaching process is D0E(OX)D1. ### Claim 9 (depends on 2) The method according to claim 2, wherein the four-stage bleaching process is a sequence chosen from one of D0ED1(OX) or D0(OX)D1(OX). ### Claim 10 A method of making an oxidized cellulose comprising: bleaching a cellulosic pulp using a bleaching process consisting of three bleaching stages, wherein at least one stage of the three-stage bleaching process is an oxidizing (OX) stage comprising oxidizing the pulp with at least one peroxide and at least one catalyst under acidic conditions, and wherein the three-stage bleaching process is a sequence chosen from one of D0(OX)D1, DE(OX), or D(OX)E. ### Claim 11 (depends on 10) The method according to claim 10, wherein the at least one catalyst comprises at least one of a copper-containing catalyst and an iron-containing catalyst, and wherein the at least one peroxide is hydrogen peroxide. ### Claim 12 (depends on 11) The method according to claim 11, wherein at least one stage of the bleaching process is a carboxylating D stage comprising treating the fiber with a carboxylating agent. ### Claim 13 (depends on 11) The method according to claim 11, wherein the three-stage bleaching process is a sequence chosen from one of D0(OX)D1 or D(OX)E. ### Claim 14 (depends on 11) The method according to claim 11, wherein the three-stage bleaching process is a sequence chosen from one of D0(OX)D1 or DE(OX). ### Claim 15 (depends on 11) The method according to claim 11, wherein the three-stage bleaching process is D0(OX)D1 and D1 is a carboxylating D stage comprising treating the fiber with a carboxylating agent. ### Claim 16 (depends on 11) The method according to claim 11, wherein the three-stage bleaching process is a sequence chosen from one of D0(OX)D1 or D(OX)E. ### Claim 17 (depends on 11) The method according to claim 11, wherein the three-stage bleaching process is D0(OX)D1. ### Claim 18 (depends on 1) The method according to claim 1, wherein at least one of the D stages is a carboxylating D stage comprising treatment with either sodium chlorite and hydrogen peroxide or chlorine dioxide and hydrogen peroxide. ### Claim 19 (depends on 18) The method according to claim 18, wherein the four-stage bleaching process is a sequence chosen from one of D0E(OX)D1, D0(OX)D1(OX), or D0(OX)D1D2 and wherein the at least one D stage comprising treatment with either sodium chlorite and hydrogen peroxide or chlorine dioxide and hydrogen peroxide follows at least one oxidizing stage. ### Claim 20 (depends on 10) The method according to claim 10, wherein at least one of the D stages is a carboxylating D stage comprising treatment with either sodium chlorite and hydrogen peroxide or chlorine dioxide and hydrogen peroxide. ### Claim 21 (depends on 10) The method according to claim 10, wherein the three-stage bleaching process is D0(OX)D1, and wherein the D1 stage is a carboxylating D stage comprising treatment with either sodium chlorite and hydrogen peroxide or chlorine dioxide and hydrogen peroxide.