Polyether-modified siloxane and a thickening agent

Patent metadata

Field	Value
Publication number	US-10358530-B2
Application number	US-201715797560-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Oct 31, 2016
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

One of the purposes of the present invention is to provide a polyether-modified siloxane having a good thickening property, in particular a good thickening property for an aqueous liquid. The present invention provides a polyether-modified siloxane represented by the following general formula (1):

Sx-(CH 2 ) a COO—(C 2 H 4 O) n —(C 3 H 6 O) s —CO(CH 2 ) a -Sx   (1)
wherein n is an integer of from 50 to 10000, s is an integer which meets the equation, 0<=s<=n/50, a is an integer of from 2 to 40, and Sx is, independently of each other, an organo(poly)siloxanyl group represented by the following formula (a) or (b):

wherein R is, independently of each other, a hydrogen atom, a hydroxyl group, an alkoxyl group, or a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, m is an integer of from 0 to 350, and m′ is an integer of from 0 to 348,

wherein a ratio of a total molecular weight of the Sx-(CH 2 ) a CO moieties to a molecular weight of the O(C 2 H 4 O) n (C 3 H 6 O) s moiety is 0.12 or smaller.

First claim

The invention claimed is:

1. A polyether-modified siloxane represented by the following general formula (1):
Sx-(CH 2 ) a COO—(C 2 H 4 O) n —(C 3 H 6 O) s —CO(CH 2 ) a -Sx  (1)

wherein n is an integer of from 50 to 10000, s is an integer which meets the equation, 0≤s≤n/50, a is an integer of from 2 to 40, and Sx is, independently of each other, an organo(poly)siloxanyl group represented by the following formula (a) or (b):

wherein R is, independently of each other, a hydrogen atom, a hydroxyl group, an alkoxyl group, or a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, m is an integer of from 1 to 350, and m′ is an integer of from 0 to 348,
wherein a ratio of a total molecular weight of the Sx-(CH 2 ) a CO moieties to a molecular weight of the O(C 2 H 4 O) n (C 3 H 6 O) s moiety is 0.12 or smaller.

2. A thickening agent comprising the polyether-modified siloxane according to claim 1 .

3. A method for thickening an aqueous liquid by mixing the thickening agent according to claim 2 and the aqueous liquid.

4. An aqueous solution comprising the thickening agent according to claim 2 , wherein an amount of the thickening agent is 0.5 to 50 mass %, based on a total mass of water and the thickening agent.

5. An aqueous dispersion comprising the thickening agent according to claim 2 , wherein an amount of the thickening agent is 0.5 to 50 mass %, based on a total mass of water and the thickening agent.

6. A method for preparing the polyether-modified siloxane according to claim 1 , wherein the method comprises a step of reacting Sx-(CH 2 ) a COOH with a halogenated sulfonyl compound and a step of reacting the compound obtained in the aforesaid step with HO(C 2 H 4 O) n —(C 3 H 6 O) s H to thereby obtain the polyether-modified siloxane.

7. The method according to claim 6 , wherein the halogenated sulfonyl compound is R′—SO 2 —X, wherein R′ is an alkyl group, an aryl group or a dialkylamino group and X is a halogen atom.

Assignees

• Shinetsu Chemical Co

Inventors

• Ando Yuji

Classifications

• A61K2800/48

  Thickener, Thickening system · CPC title

• C08G77/14

  containing silicon bound to oxygen-containing groups · CPC title

• A61K8/894

  modified by a polyoxyalkylene group, e.g. cetyl dimethicone copolyol · CPC title

• C08L71/02

  Polyalkylene oxides · CPC title

• C08G77/46 Primary

  containing polyether sequences · CPC title