Hydrophilic thickener and cosmetic composition

Patent metadata

Field	Value
Publication number	US-9763869-B2
Application number	US-201414901267-A
Country	US
Kind code	B2
Filing date	Jun 6, 2014
Priority date	Jun 28, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A hydrophilic thickener comprising a polymer obtainable by subjecting a water-soluble ethylenically unsaturated monomer to a reversed phase suspension polymerization in the presence of a polyoxyethylene polyoxypropylene alkyl ether; and a cosmetic composition containing the hydrophilic thickener. The hydrophilic thickener according to the present invention can be used in the fields of cosmetics such as powder foundations, liquid foundations, emulsions, lotions, liquid cosmetics, moisturizing gel, all-in-one gels, cleansing foams, hair setting agents, emollient creams; toiletries, sundries, and the like.

First claim

The invention claimed is:

1. A hydrophilic thickener comprising a polymer obtained by subjecting a water-soluble ethylenically unsaturated monomer to a reversed phase suspension polymerization in the presence of a polyoxyethylene polyoxypropylene alkyl ether;
wherein transmittance of light beam at 425 nm for an aqueous gel of the hydrophilic thickener at a concentration 0.5% by mass is 90% or more.

2. The hydrophilic thickener according to claim 1 , wherein the water-soluble ethylenically unsaturated monomer is at least one member selected from the group consisting of acrylic acid and salts thereof, methacrylic acid and salts thereof, 2-acrylamide-2-methylpropanesulfonic acid and salts thereof, acrylamide, methacrylamide, and N,N-dimethylacrylamide.

3. The hydrophilic thickener according to claim 1 or 2 , wherein the polyoxyethylene polyoxypropylene alkyl ether is a compound represented by the formula (I):
RO—(C 2 H 4 O) m (C 3 H 6 O) n —H  (I)

wherein R is an alkyl group having from 3 to 24 carbon atoms, m is an integer of from 2 to 100, and n is an integer of from 2 to 100.

4. A cosmetic composition comprising a hydrophilic thickener as defined in claim 1 .

5. A hydrophilic thickener consisting essentially of a polymer obtained by subjecting a water-soluble ethylenically unsaturated monomer to a reversed phase suspension polymerization in the presence of a polyoxyethylene polyoxypropylene alkyl ether;
wherein transmittance of light beam at 425 nm for an aqueous gel of the hydrophilic thickener at a concentration 0.5% by mass is 90% or more.

6. The hydrophilic thickener according to claim 5 , wherein the water-soluble ethylenically unsaturated monomer is at least one member selected from the group consisting of acrylic acid and salts thereof, methacrylic acid and salts thereof, 2-acrylamide-2-methylpropanesulfonic acid and salts thereof, acrylamide, methacrylamide, and N,N-dimethylacrylamide.

7. The hydrophilic thickener according to claim 5 , wherein the polyoxyethylene polyoxypropylene alkyl ether is a compound represented by the formula (I):
RO—(C 2 H 4 O) m (C 3 H 6 O) n —H  (I)

wherein R is an alkyl group having from 3 to 24 carbon atoms, m is an integer of from 2 to 100, and n is an integer of from 2 to 100.

8. A cosmetic composition comprising a hydrophilic thickener as defined in claim 5 .

Assignees

• Sumitomo Seika Chemicals

Inventors

• Wajima Ayami
• Mizukawa Junichi
• Masuda Tsuyoshi
• Ozawa Hitoshi

Classifications

• A61Q19/00 Primary

  Preparations for care of the skin · CPC title

• A61K2800/10

  General cosmetic use · CPC title

• C08F4/04

  Azo-compounds · CPC title

• A61Q19/10

  Washing or bathing preparations · CPC title

• C08F2/18

  Suspension polymerisation · CPC title