Use of polyglycerol partial esters as defoamers

Patent metadata

Field	Value
Publication number	US-9738797-B2
Application number	US-201313866526-A
Country	US
Kind code	B2
Filing date	Apr 19, 2013
Priority date	Apr 20, 2012
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

The present invention relates to the use of polyglycerol partial esters as defoamers, in particular in coating and paint applications, to defoamers comprising polyglycerol partial esters, and to corresponding polyglycerol partial esters.

First claim

The invention claimed is:

1. A method of defoaming a liquid, comprising:
providing polyglycerol partial esters that are obtained by esterification of a polyglycerol mixture with acids comprising:
a saturated or unsaturated, linear or branched fatty acid having 4 to 22 carbon atoms, and/or an aromatic monocarboxylic acid having 7 to 22 carbon atoms; and
a polyfunctional carboxylic acid having 4 to 54 carbon atoms, and/or its anhydride or ester; and

defoaming the liquid by applying the polyglycerol partial esters to the liquid;
wherein the degree of esterification of the polyglycerol mixture is between 76 and 100%; and
wherein the polyglycerol mixture is based on polyglycerols with an average degree of condensation in a range of 3-5.

2. The method according to claim 1 ;
wherein acids comprise the saturated or unsaturated, linear or branched fatty acid having 4 to 22 carbon atoms, which is selected from the group consisting of isostearic acid, oleic acid, and linolenic acid.

3. The method according to claim 1 ;
wherein the polyfunctional carboxylic acid is selected from the group consisting of oxalic acid, fumaric acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, phthalic acid, and their anhydrides and esters.

4. The method according to claim 1 ;
wherein the polyglycerol partial esters have a polydispersity of at least 2.

Assignees

• Evonik Industries Ag
• Evonik Deguesse GmbH

Inventors

• Nilewski Margitta
• Favresse Philippe
• Scharf André
• Gehrmann Petra
• Mettin Thomas
• Schwan Michael
• Springer Oliver
• Wied Tobias

Classifications

• C09D7/1233 Primary

  Chemistry & Metallurgy · mapped topic

• C07C69/34

  Esters of acyclic saturated polycarboxylic acids having an esterified carboxyl group bound to an acyclic carbon atom · CPC title

• C08G65/48

  Polymers modified by chemical after-treatment · CPC title

• C09D7/125

  Chemistry & Metallurgy · mapped topic

• C07C69/50

  Sebacic acid esters · CPC title