Antifoaming agents for the paper industry, based on oil in water emulsions

Patent metadata

Field	Value
Publication number	US-2016265162-A1
Application number	US-201415035959-A
Country	US
Kind code	A1
Filing date	Nov 17, 2014
Priority date	Nov 19, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

The present invention which provides antifoaming agents for the paper industry, based on oil-in-water emulsions, in which the oil phase accounts for from 5 to 50% by weight of the emulsion if the oil phase of the emulsions contains (a) an alcohol of not less than 12 carbon atoms, fatty esters of alcohols of not less than 22 carbon atoms and C 1 -C 36 -carboxylic acids, distillation residues which are obtainable in the preparation of alcohols having a relatively large number of carbon atoms by the oxo synthesis or by the Ziegler method and which may furthermore be alkoxylated, a mixture of the stated compounds and (b) optionally a fatty ester of a C 12 -C 22 -carboxylic acid with a monohydric to trihydric C 1 -C 18 -alcohol and, (c) optionally a hydrocarbon having a boiling point above 200° C. or a fatty acid of 12 to 22 carbon atoms, in combination with from 1 to 80% by weight of component (d) comprising (d1) polyglyceryl esters which are obtainable by not less than 20% esterification of a polyglycerol mixture of from 0 to 10% by weight of monoglycerol, from 15 to 40% by weight of diglycerol, from 30 to 55% by weight of triglycerol, from 10 to 25% by weight of tetraglycerol, from 0 to 15% by weight of pentaglycerol, from 0 to 10% by weight of hexaglycerol and from 0 to 5% by weight of polyglycerols having higher degrees of condensation with one or more fatty acids of 12 to 36 carbon atoms; and (d2) C 18 -C 30 alkyl behenate. The antifoaming agents can be used for preventing foam in pulp cooking, in the beating of paper stock, in papermaking and in the dispersing of pigments for papermaking. Further, the anti-foaming agents can be used for preventing foam in paper stocks.

First claim

1 : An antifoaming agent, based on oil-in-water emulsions, in which the oil phase accounts for from 5 to 50% by weight of the emulsion, the oil phase comprising:
(a) an alcohol of not less than 12 carbon atoms, a fatty ester of an alcohol of not less than 22 carbon atoms and a C 1 -C 36 -carboxylic acid a distillation residue which is obtainable in a preparation of an alcohol having a large number of carbon atoms by oxo synthesis or by a Ziegler method, said distillation residue may be alkoxylated, or a mixture thereof, (b) optionally a fatty ester of a C 12 -C 22 -carboxylic acid with a monohydric to trihydric C 1 -C 18 -alcohol, and, (c) optionally a hydrocarbon having a boiling point above 200° C. or a fatty acid of 12 to 22 carbon atoms, in combination with from 1 to 80% by weight of component (d) comprising (d1) a polyglyceryl ester which is obtainable by not less than 20% esterification of a polyglycerol mixture of from 0 to 10% by weight of monoglycerol, from 15 to 40% by weight of diglycerol, from 30 to 55% by weight of triglycerol, from 10 to 25% by weight of tetraglycerol, from 0 to 15% by weight of pentaglycerol, from 0 to 10% by weight of hexaglycerol and from 0 to 5% by weight of polyglycerols having higher degrees of condensation with one or more fatty acids of 12 to 36 carbon atoms;
and
(d2) C 18 -C 30 alkyl behenate.

2 : An antifoaming agent according to claim 1 in which the polyglyceryl esters of component (d1) is polyglyceryl behenate.

3 : An antifoaming agent and according to claim 1 in which the C 18 -C 30 alkyl behenate is behenyl behenate.

4 : A process, for preventing foam in pulp cooking, pulp preparation in the refining of paper stock, in papermaking and in the dispersing of pigments for papermaking, which comprises adding an effective amount of the antifoaming agent according to claim 1 to paper pulp.

5 : A process for preventing foam in paper stocks which comprises adding the antifoaming agent according to claim 1 to paper stock in an amount of from 0.02 to 0.5 parts by weight per 100 parts by weight of paper stock.

Assignees

• Basf Se

Inventors

• Kern Holger
• Hamers Christoph
• Möller Klaus
• Albrecht Uwe

Classifications

• D21H21/12 Primary

  Defoamers · CPC title

• D21H17/06

  Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals · CPC title

• D21H17/04

  Hydrocarbons · CPC title

• B01D19/0404

  characterised by the nature of the chemical substance · CPC title

• D21H17/14

  Carboxylic acids; Derivatives thereof · CPC title