# US 8,784,606 B2 · Method for reducing negative effects of adhesive contaminants in systems of substances comprising waste paper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,784,606 B2 - Document ID: US8784606B2 - Status: Granted - Kind: B2 - Application number: 13/388,552 - Filed: 2010-07-27 - Published: 2012-07-26 - Granted: 2014-07-22 - Earliest claimed: 2009-08-03 - Assignees: Clariant Finance (BVI) Limited - Applicants: Achim Kohler; John Stuart Cowman; Damien Corpet; Antonella Leone-Kammler - Inventors: Achim Kohler; John Stuart Cowman; Damien Corpet; Antonella Leone-Kammler - Web page: https://patentgrep.com/patent/US8784606B2 ## CPC - D21C 9/086: {with organic compounds or compositions comprising organic compounds} - D21C 5/02: Working-up waste paper (mechanical part D21B1/08, D21B1/32) - Y02W 30/64: Paper recycling - D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR - Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT ## Abstract The invention relates to a method for reducing the negative effects of adhesive contaminants in the processing of waste paper, wherein an aqueous polymer dispersion comprising one component A and one component B for coagulation and detackification of stickies is added during the processing of waste paper, wherein component A is a homo- and/or copolymer of methyl methacrylate, acrylate and/or styrene and component B is a styrene copolymer having acrylic acid, maleimide and/or maleic acid hydride. The polymer dispersion can optionally comprise another component C, a cationic fixing agent that supports the coagulation of the stickies. ## Claims ### Claim 1 A method for reducing the negative consequences of sticky contaminants in the processing of waste paper, which comprises the steps of, when processing waste paper, adding an aqueous polymer dispersion comprising (i) a polymer A and (ii) a polymer B for coagulating and detackifying the sticky contaminants, (i) polymer A selected from the group consisting of a homopolymer or copolymer of acrylic acid or alkyl esters of acrylic acid, methacrylic acid or its alkyl esters, styrene, methylstyrene, vinyl acetate, itaconic acid, glycidyl methacrylate, 2-hydroxyalkyl(meth)acrylate, methacrylamide, N-hydroxyethyl(meth)acrylamide, dimethacrylate monomers, 1,3-butylene glycol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, propylene glycol dimethacrylate, dipropylene glycol dimethacrylate, 4-methyl-1,4-pentanediol dimethacrylate, divinylbenzene, trivinylbenzene and mixtures thereof, and (ii) polymer B comprises a styrene copolymer of acrylic acid, maleimide, maleic anhydride or mixtures thereof. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein polymer A has a glass transition temperature >40° C. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein polymer B has a molecular weight in the range from 3000 to 15 000 g/mol. ### Claim 4 (depends on 1) The method as claimed in claim 1, wherein the aqueous polymer dispersion further comprises a component C, a cationic fixative, which promotes the coagulation of the sticky contaminates. ### Claim 5 (depends on 4) The method as claimed in claim 4, wherein component C is selected from the group consisting of polyethyleneimine (PEI), polydiallyldimethylammonium chloride (polyDADMAC), polyvinylamine (PVAm), polyaluminum chloride (PAC), polyacrylamide (PAAM), and polyamine. ### Claim 6 (depends on 1) The method as claimed in claim 1, wherein the aqueous polymer dispersion further comprises a component D, a surfactant. ### Claim 7 (depends on 1) The method as claimed in claim 1, wherein the water fraction of the aqueous polymer dispersion is 93% to 17.7%. ### Claim 8 (depends on 1) The method of claim 1, wherein the aqueous polymer dispersion comprises 2% to 50%, of polymer A, 2% to 30%, of polymer B, 0% to 2% of a component C selected from the group consisting of polyethyleneimine (PEI), polydiallyldimethylammonium chloride (polyDADMAC), polyvinylamine (PVAm), polyaluminum chloride (PAC), polyacrylamide (PAAM), and polyamine, 0% to 0.3%, of a component D, a surfactant and 96% to 17.7% of water. ### Claim 9 (depends on 1) The method as claimed in claim 1, wherein polymer B has a molecular weight in the range from 3000 to 7000 g/mol. ### Claim 10 (depends on 1) The method as claimed in claim 1, wherein the water fraction of the aqueous polymer dispersion is 80% to 45% by weight. ### Claim 11 (depends on 1) The method of claim 1, wherein the aqueous polymer dispersion comprises 5% to 30% of polymer A, 5% to 25% of polymer B, 0% to 2% of a component C selected from the group consisting of polyethyleneimine (PEI), polydiallyldimethylammonium chloride (polyDADMAC), polyvinylamine (PVAm), polyaluminum chloride (PAC), polyacrylamide (PAAM), and polyamine, 0% to 0.2% of a component D, a surfactant and 90% to 45% of water. ### Claim 12 (depends on 1) The method as claimed in claim 1, wherein polymer A has a glass transition temperature >80° C. ### Claim 13 (depends on 1) The method as claimed in claim 1, wherein polymer B comprises a copolymer of styrene and acrylic acid. ### Claim 14 (depends on 1) The method as claimed in claim 1, wherein the aqueous polymer dispersion has particles with sizes of less than 150 nm. ### Claim 15 (depends on 1) The method as claimed in claim 1, wherein the aqueous polymer dispersion has particles with sizes of less than 120 nm. ### Claim 16 (depends on 1) The method as claimed in claim 1, wherein the aqueous polymer dispersion is added before a deinking procedure. ### Claim 17 (depends on 1) The method as claimed in claim 1, wherein between 0.5-2 kg/t of the aqueous polymer dispersion is used. ### Claim 18 (depends on 1) The method as claimed in claim 1, wherein polymer A comprises a homopolymer or copolymer of methyl methacrylate. ### Claim 19 (depends on 1) The method as claimed in claim 1, wherein polymer A comprises a homopolymer or copolymer of styrene. ### Claim 20 (depends on 1) The method as claimed in claim 1, wherein polymer A is hydrophobic.