# US 5,700,351 A · Antifoams based on oil-in-water emulsions for the paper industry > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,351 A - Document ID: US5700351A - Status: Granted - Kind: A - Application number: 08/379,442 - Filed: 1995-02-06 - Granted: 1997-12-23 - Earliest claimed: 1992-09-28 - Assignees: BASF SE - Inventors: Rudolf Schuhmacher; Gabriele Dralle-Voss; Knut Oppenlaender; Brigitte Wegner; Andreas Hohmann - Web page: https://patentgrep.com/patent/US5700351A ## CPC - B01D 19/0404: {characterised by the nature of the chemical substance} - D21H 17/14: Carboxylic acids; Derivatives thereof - D21H 21/12: Defoamers - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - 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 Antifoams based on oil-in-water emulsions, in which the oil phase accounts for from 5 to 50% by weight of the emulsions and consists essentially of a mixture of (a) fatty esters of C.sub.12 -C.sub.22 -carboxylic acids with monohydric to trihydric C.sub.1 -C.sub.22 -alcohols, (b) polyglyceryl esters which are obtainable by at least 20% esterification of polyglycerols which contain at least 2 glyceryl units with at least one C.sub.12 -C.sub.36 -fatty acid and (c) fatty esters of C.sub.12 -C.sub.22 -carboxylic acids and polyalkylene glycols, the molecular weight of the polyalkylene glycols being up to 5,000 g/mol, and, if required, (d) long-chain alcohols, fatty esters of alcohols of at least 22 carbon atoms and C.sub.1 -C.sub.36 -carboxylic acids, distillation residues which are obtainable in the preparation of alcohols having a relatively large number of carbon atoms by oxo synthesis or by the Ziegler process and which may be alkoxylated, and/or (e) hydrocarbons having a boiling point above 200.degree. C. or fatty acids of 12 to 22 carbon atoms, are used for controlling foam in pulp digestion, in the beating of paper stock, in papermaking and in the dispersing of pigments for papermaking. ## Claims ### Claim 1 An oil-in-water emulsion comprising an oil phase and an aqueous phase in which the oil phase accounts for from 5 to 50% by weight of the emulsion and said oil phase consists essentially of a mixture of (a) fatty esters of C.sub.12 -C.sub.22 -carboxylic acids with monohydric to trihydric C.sub.1 -C.sub.22 -alcohols, (b) polyglyceryl esters which are obtainable by at least 20% esterification of polyglycerols which contain at least 2 glyceryl units with at least one C.sub.12 -C.sub.36 -fatty acid and (c) fatty esters of C.sub.12 -C.sub.22 -carboxylic acids and polyalkylene glycols, the molecular weight of the polyalkylene glycols being up to 5,000 g/mol, and, if required, (d) alcohols of at least 12 carbon atoms, fatty esters of alcohols of at least 22 carbon atoms and C.sub.1 -C.sub.36 -carboxylic acids, distillation residues which are obtainable in the preparation of alcohols having a relatively large number of carbon atoms by oxo synthesis or by the Ziegler process and which may be alkoxylated, or a mixture of the stated compounds or (e) hydrocarbons having a boiling point above 200.degree. C. or fatty acids of 12 to 22 carbon atoms. ### Claim 2 (depends on 1) A method for foam control in pulp digestion, in the beating of paper stock, in papermaking and in dispersing pigments for papermaking, comprising: adding the oil-in-water emulsion of claim 1 in an amount of from 0.02 to 0.5 part by weight per 100 parts by weight of a foam-forming medium. ### Claim 3 (depends on 1) A method for deaerating paper stocks, comprising: adding the oil-in-water emulsion of claim 1 in an amount of from 0.02 to 0.5 part by weight per 100 parts by weight of paper stocks. ### Claim 4 (depends on 1) The oil-in-water emulsion of claim 1, which contains 1 to 90% by weight, based on the total weight of the oil phase, of component (a). ### Claim 5 (depends on 4) The oil-in-water emulsion of claim 4, which contains 40 to 80% by weight, based on the total weight of the oil phase, of component (a). ### Claim 6 (depends on 1) The oil-in-water emulsion of claim 1, which contains 1 to 80% by weight, based on the total weight of the oil phase, of component (b). ### Claim 7 (depends on 6) The oil-in-water emulsion of claim 6, which contains 5 to 20% by weight, based on the total weight of the oil phase, of component (b). ### Claim 8 (depends on 1) The oil-in-water emulsion of claim 1, which contains 1 to 80% by weight, based on the total weight of the oil phase, of component (c). ### Claim 9 (depends on 8) The oil-in-water emulsion of claim 8, which contains 5 to 20% by weight, based on the total weight of the oil phase, of component (c). ### Claim 10 (depends on 1) The oil-in-water emulsion of claim 1, which contains up to 80% by weight, based on the total weight of components (a), (b) and (c), of component (d). ### Claim 11 (depends on 10) The oil-in-water emulsion of claim 10, which contains up to 10% by weight, based on the total weight of components (a), (b) and (c), of component (d). ### Claim 12 (depends on 1) The oil-in-water emulsion of claim 1, which contains up to 50% by weight, based on the total weight of components (a), (b) and (c), of component (e). ### Claim 13 (depends on 12) The oil-in-water emulsion of claim 12, which contains up to 20% by weight, based on the total weight of components (a), (b) and (c), of component (e). ### Claim 14 An oil-in-water emulsion comprising an oil phase and an aqueous phase in which the oil phase accounts for from 5 to 50% by weight of the emulsion and said oil phase consists essentially of a mixture of (a) fatty esters of C.sub.12 -C.sub.22 -carboxylic acids with monohydric to trihydric C.sub.1 -C.sub.22 -alcohols, (b) polyglycoryl esters which are obtained by at least 20% esterification of polyglycerols which contain at least 2 glyceryl units with at least one C.sub.12 -C.sub.36 -fatty acid and (c) fatty esters of C.sub.12 -C.sub.22 -carboxylic acids and polyalkylene glycols, the molecular weight of the polyalkylene glycols being up to 5,000 g/mol, and, if required, (d) alcohols of at least 12 carbon atoms, fatty esters of alcohols of at least 22 carbon atoms and C.sub.1 -C.sub.36 -carboxylic acids, distillation residues which are obtained in the preparation of alcohols having a relatively large number of carbon atoms by oxo synthesis or by the Ziegler process and which may be alkoxylated, or a mixture of the stated compounds or (e) hydrocarbons having a boiling point of above 200.degree. C. or fatty acids of 12 to 22 carbons atoms, which further comprises (f) a surfactant selected from the group consisting of salts of higher fatty acids, oxyalkylated alkylphenols, oxyethylated unsaturated oils, salts of sulfated oxyethylation products of nonylphenol or octylphenol, benzenesulfonic acid, salts of benzenesulfonic acid, alkylbenezenesulfonic acids and salts thereof. ### Claim 15 (depends on 14) The oil-in-water emulsion of claim 14, comprising 0.1 to 5 parts by weight of component (f) for every 100 parts by weight of components (a), (b), (c) and (d).