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

Patent metadata

Field	Value
Publication number	US-9982392-B2
Application number	US-201415035959-A
Country	US
Kind code	B2
Filing date	Nov 17, 2014
Priority date	Nov 19, 2013
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

An antifoaming agent, based on an oil-in-water emulsion in which the oil phase accounts for from 5-50% by weight of the emulsion, where the oil phase includes: (a) at least one selected from the group consisting of (a1) an alcohol of not less than 12 carbon atoms and (a2) a C 1 -C 36 -carboxylic acid, a distillation residue; (d) a component including (d1) a polyglyceryl ester and (d2) a C 18 -C 30 alkyl behenate, wherein the component (d) accounts for 1-80% by weight of the oil phase of the emulsion.

First claim

The invention claimed is:

1. An antifoaming agent, comprising an oil-in-water emulsion in which the oil phase accounts for from 5 to 50% by weight of the emulsion, wherein the oil phase comprises:
(a) at least one selected from the group consisting of
(a1) an alcohol of not less than 12 carbon atoms, and
(a2) a C 1 -C 36 -carboxylic acid, a distillation residue from preparing an alcohol by oxo synthesis or by a Ziegler method, wherein the distillation residue is optionally alkoxylated;

(b) optionally, a fatty ester of a C 12 -C 20 -carboxylic acid with a monohydric to trihydric C 1 -C 18 -alcohol;
(c) optionally, a hydrocarbon having a boiling point above 200° C. or a fatty acid of 12 to 22 carbon atoms; and
(d) a component comprising:
(d1) a polyglyceryl ester, which is polyglyceryl behenate obtained by esterifying, to an esterification degree of at least 20%, behenic acid with a polyglycerol mixture comprising:
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; and

(d2) behenyl behenate,

wherein the component (d) accounts for 1-80% by weight of the oil phase of the emulsion.

2. 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, the process comprising:
adding an effective amount of the antifoaming agent of claim 1 to paper pulp.

3. A process for preventing foam in paper stocks, the process comprising:
adding the antifoaming agent of 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
• Moeller Klaus
• Albrecht Uwe

Classifications

• D21H21/12 Primary

  Defoamers · CPC title

• C11D3/0026

  Low foaming or foam regulating compositions · CPC title

• B01D19/0404

  characterised by the nature of the chemical substance · CPC title

• D21C3/28

  Prevention of foam · CPC title

• D21H17/04

  Hydrocarbons · CPC title