# US 10,945,942 B2 · Starting material for cosmetics

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- Number: US 10,945,942 B2
- Document ID: US10945942B2
- Status: Granted
- Kind: B2
- Application number: 15/501,989
- Filed: 2015-06-30
- Published: 2017-08-24
- Granted: 2021-03-16
- Earliest claimed: 2014-08-06
- Assignees: Shiseido Company, Ltd.
- Applicants: Shiseido Company, Ltd.
- Inventors: Yuki Sugiyama; Hirohito Shirakami; Kazuyuki Miyazawa
- Web page: https://patentgrep.com/patent/US10945942B2

## CPC

- A61K 8/8152: {Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers}
- A61K 8/042: {Gels}
- A61K 8/062: {Oil-in-water emulsions}
- A61K 8/31: Hydrocarbons
- A61K 8/342: {Alcohols having more than seven atoms in an unbroken chain}
- A61K 8/345: {containing more than one hydroxy group}
- A61K 8/361: {Carboxylic acids having more than seven carbon atoms in an unbroken chain; Salts or anhydrides thereof}
- A61K 8/585: {Organosilicon compounds}
- A61K 8/86: Polyethers
- A61Q 1/00: Make-up preparations; Body powders; Preparations for removing make-up
- A61Q 5/06: Preparations for styling the hair, e.g. by temporary shaping or colouring
- A61Q 17/04: Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
- A61Q 19/00: Preparations for care of the skin
- A61Q 19/007: {Preparations for dry skin}
- A61Q 19/02: for chemically bleaching or whitening the skin
- A61Q 19/10: Washing or bathing preparations
- A61K 2800/30: Characterized by the absence of a particular group of ingredients
- A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns
- A61K 2800/54: Polymers characterized by specific structures/properties
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS

## Abstract

A starting (raw) material, for cosmetics, comprising a core corona type microgel dispersion obtained by radical polymerization of a specific polyethylene oxide macromonomer, a specific hydrophobic monomer, and a specific cross-linking monomer under specific conditions. The purpose of the present invention is to provide the raw material for cosmetics, with which the cosmetic having a high stability provides a good feeling in use and does not cause skin irritation, can be easily produced.

## Claims

### Claim 1

A production method of raw material for cosmetics consisting of a core-corona microgel dispersion comprising:
the step of a radical polymerization of:
(A) a polyethylene oxide macromonomer having chemical formula (1),
wherein R1 is an alkyl group having 1 to 3 carbon atoms, n is a number of 8 to 200 and X is H or CH3;
(B) a hydrophobic monomer having chemical formula (2),
wherein R2 is an alkyl group having 1 to 3 carbon atoms, and R3 is an alkyl group having 1 to 12 carbon atoms;
and
(C) a cross-linking monomer having chemical formula (3),
wherein R4 and R5 are independent alkyl group having 1 to 3 carbon atoms, and m is a number of 0 to 2; and
(i) a mole ratio of said polyethylene oxide macromonomer versus said hydrophobic monomer is in the range of 1/10 to 1/250 (mole/mole);
(ii) said cross-linking monomer is in the range of 0.1 to 1.5% by weight relative to said hydrophobic monomer;
(iii) said hydrophobic monomer is a monomer composition comprising at least one C1 to C8 methacrylic acid ester;
(iv) a solvent used for said radical polymerization is a mixed solvent of water and at least one polyol selected from the group consisting of dipropylene glycol, 1,3-butylene glycol, and isoprene glycol, and
(v) said mixed solvent of water and polyol has a water versus said polyol ratio that is in the range of 90/10 to 10/90% by mass at 20° C.

### Claim 2 (depends on 1)

The production method of raw material for cosmetics, according to claim 1, wherein:
said solvent used for radical polymerization does not contain ethanol.

### Claim 3 (depends on 1)

A production method of emulsifier comprising:
said production method of raw material for cosmetics according to claim 1.

### Claim 4 (depends on 1)

A production method of white cloudy agent comprising:
said production method of raw material for cosmetics according to claim 1,
wherein said white cloudy agent does not contain ethanol.

### Claim 5 (depends on 2)

A production method of emulsifier comprising:
said production method of raw material for cosmetics according to claim 2.

### Claim 6 (depends on 2)

A production method of white cloudy agent comprising:
said production method of raw material for cosmetics according to claim 2,
wherein said white cloudy agent does not contain ethanol.