Granted Patent B2

US 12,285,514 · App. 17/598,378 · Granted Apr 29, 2025

Inventors: Kaori Hayashi (Shiroi, JP); Masayuki Narita (Ichikawa, JP); Naoya Kawakami (Chiba, JP); Tomokazu Iseki (Izumiotsu, JP)

Assignee: KAO CORPORATION

A61K8/8158A61K8/8147A61K8/8152A61Q5/06A61K2800/5422A61K2800/5424A61K2800/5426

Abstract

Claims (32)

1. A cosmetic composition comprising the following Components (A) and (B):

Component (A): a hydrophobic cationic polymer which dissolves in ethanol at 25° C. in an amount of 1% by mass or more, has a glass transition temperature Tg of 30° C.-180° C., and is a polymer comprising a constituting unit derived from one or more members selected from acrylamide monomers having a linear alkyl group having 1 or more carbon atoms and 12 or less carbon atoms or a branched alkyl group having 3 or more carbon atoms and 12 or less carbon atoms and aromatic vinyl monomers, and a constituting unit derived from a monomer having an amino group,

wherein Component (A) comprises constituting units represented by formula 1a in an amount of 56% by mass or more, or comprises constituting units represented by formula 2a in an amount of 45% by mass or more, or comprises constituting units represented by formula 3 in an amount of 45% by mass or more;

Component (B): a hydrophilic anionic polymer which dissolves in ethanol at 25° C. in an amount of 1% by mass or more, has a glass transition temperature Tg of 40° C.-130° C., and is a polymer comprising a constituting unit derived from a monomer having a carboxy group,

wherein Component (B) comprises 35% by mass or more of a total of constituting units represented by formula 1b, constituting units represented by formula 2b, and constituting units represented by formula 2c, and

wherein a mass ratio of Component (A) to Component (B) is 0.1 or more and 5.0 or less;

formula 1a:

wherein R 1 is a hydrogen atom or a methyl group; and each of R 2 and R 3 is independently a hydrogen atom or a hydrocarbon group having 1 or more carbon atoms and 12 or less carbon atoms which may have a substituent, with the proviso that:

when either one of R 2 or R 3 is a hydrogen atom, the other is a hydrocarbon group having 4 or more carbon atoms and 12 or less carbon atoms, and

when both R 2 and R 3 are not a hydrogen atom, they are hydrocarbon groups having a total number of carbon atoms of R 2 and R 3 of 5 or more and 24 or less; or

alternatively, R 2 and R 3 may be bound to each other to form a ring structure, and a total number of carbon atoms of R 2 and R 3 in that case is 5 or more and 24 or less;

formula 1b:

wherein R 1 is a hydrogen atom or a methyl group; and each of R 2 and R 3 is independently a hydrogen atom or a hydrocarbon group having 1 or more carbon atoms and 3 or less carbon atoms which may have a substituent, with the proviso that:

when either one of R 2 or R 3 is a hydrogen atom, the other is a hydrocarbon group having 1 or more carbon atoms and 3 or less carbon atoms, and

when both R 2 and R 3 are not a hydrogen atom, they are hydrocarbon groups having a total number of carbon atoms of R 2 and R 3 of 2 or more and 4 or less; or

alternatively, R 2 and R 3 may be bound to each other to form a ring structure, and a total number of carbon atoms of R 2 and R 3 in that case is 3 or more and 4 or less,

formula 2a:

wherein R 4 is a hydrogen atom or a methyl group, X′ is an oxygen atom, —Y 1 —X 2 is an alkyl group having 1 or more carbon atoms and 18 or less carbon atoms or an isobornyl group;

formula 2b:

wherein R 4 is a hydrogen atom or a methyl group, X 1 is an oxygen atom, Y′ is a group comprising 1 to 15 polyoxyalkylene groups having 2 or 3 carbon atoms, and —X 2 is a hydrogen atom, ˜CH 3 , or —C 2 H 5 ;

formula 2c:

wherein R 4 is a hydrogen atom or a methyl group, X 1 is NH or an oxygen atom, Y 1 is an alkylene group having 1 or more carbon atoms and 3 or less carbon atoms, or —C(CH 3 ) 2 —, X 2 is —N(R 5 ) 2 or —OR 5 , where R 5 is a hydrogen atom or an alkyl group having 1 or more carbon atoms and 4 or less carbon atoms;

formula 3:

wherein R 6 is a hydrogen atom or a methyl group, and X 3 is an aromatic group having 6 or more carbon atoms and 12 or less carbon atoms.

2. The cosmetic composition according to claim 1 , wherein Component (A) comprises constituting units represented by formula 1a in an amount of 56% by mass or more.

3. The cosmetic composition according to claim 1 , wherein Component (A) comprises constituting units represented by formula 2a in an amount of 45% by mass or more.

4. The cosmetic composition according to claim 1 , wherein Component (A) comprises constituting units represented by formula 3 in an amount of 45% by mass or more.

5. The cosmetic composition according to claim 1 , wherein a weight-average molecular weight of Component (A) is 5,000 to 500,000.

6. The cosmetic composition according to claim 1 , further comprising ethanol.

7. The cosmetic composition according to claim 1 , formulated as a hair cosmetic.

8. A method of hair styling, comprising applying the cosmetic composition as defined in claim 1 to hair.

9. The cosmetic composition according to claim 1 , wherein a mass ratio of Component (A) to Component (B) (Component (A)/Component (B)) is 0.8 to 1.5.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (19)