Cosmetic for hair containing co-modified organopolysiloxane

1. A cosmetic for hair comprising (A) a co-modified organopolysiloxane represented by the following general formula (1):

R 1 a L 1 b Q c SiO (4−a−b−c)/2   (1)

wherein

R 1 represents a monovalent organic group, with the proviso that L and Q are excluded therefrom, a hydrogen atom or a hydroxyl group;

L 1 represents a silylalkyl group having a siloxane dendron structure, in the case of i=1, represented by the following general formula (2):

wherein

R 2 represents a substituted or non-substituted, and linear or branched monovalent hydrocarbon group having 1 to 30 carbon atoms;

R 3 independently represents an alkyl group having 1 to 6 carbon atoms or a phenyl group;

Z represents a divalent organic group;

i specifies a number of generations of said silylalkyl group, represented by L i , in the case in which the number of generations of said silylalkyl group, which is the number of repetitions of said silylalkyl group, is k, i is an integer ranging from 1 to k, and the number of generations k is an integer ranging from 1 to 10;

L i+1 is said silylalkyl group in the case of i<k, and L i+1 is R 3 in the case of i=k; and

h i is a number ranging from 0 to 3;

Q represents a hydrophilic group which binds to a silicon atom via a linking group with two or more valances and comprises at least one hydrophilic unit selected from hydrophilic units represented by the following structural formulae (3-1) to (3-4):

—C r H 2r —O—  (3-1)

wherein r is a number ranging from 1 to 6,

wherein W represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms,

wherein W represents the same group as defined above, and

and

each of a, b and c is independently a number having the following range: 1.0≦a≦2.5, 0.0001≦b≦1.5, and 0.0001 ≦c≦1.5.

2. The cosmetic for hair according to claim 1 , wherein in said general formula (1), L 1 is a functional group represented by the following general formula (2-1):

or represented by the following general formula (2-2):

wherein R 2 , R 3 and Z are the same as defined above; and

each of h 1 and h 2 is independently a number ranging from 0 to 3.

3. The cosmetic for hair according to claim 1 , wherein in said general formula (1), Q further comprises at least one hydrophilic unit selected from hydrophilic units represented by the following structural formulae (3-5) to (3-7):

4. The cosmetic for hair according to claim 1 , wherein said Q is a hydrophilic group represented by any one of the following general formulae (4-1) to (4-4):

—R 4 (—O—X 1 m —R 5 ) p   (4-1)

wherein R 4 is an organic group having (p+1) valences;

p is an integer ranging from 1 to 3;

each X 1 is independently at least one or more hydrophilic units selected from hydrophilic units represented by said structural formulae (3-1) to (3-4);

m is a number ranging from 1 to 100; and

R 5 is a hydrogen atom or a group selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, an acyl group and a glycidyl group,

—R 4 (—O—X 2 ) p   (4-2)

wherein R 4 is the same group as defined above;

p is the same number as defined above; and

X 2 is a hydrophilic group represented by the following structural formula (4-2-1):

wherein at least one hydrophilic unit selected from the hydrophilic units represented by said structural formulae (3-1) to (3-4) independently binds to each of the two oxygen atoms,

—R 4 (—O—X 3 ) p   (4-3)

wherein R 4 is the same group as defined above;

p is the same number as defined above; and

X 3 is a hydrophilic group represented by the following structural formula (4-3-1):

wherein at least one hydrophilic unit selected from the hydrophilic units represented by said structural formulae (3-1) to (3-4) independently binds to each of the two oxygen atoms,

—R 4 (—O—X 4 ) p   (4-4)

wherein R 4 is the same group as defined above;

p is the same number as defined above; and

X 4 is a hydrophilic group represented by the following structural formula (4-4-1):

wherein at least one hydrophilic unit selected from the hydrophilic units represented by said structural formulae (3-1) to (3-4) independently binds to each of the two oxygen atoms.

5. The cosmetic for hair according to claim 1 , wherein said (A) co-modified organopolysiloxane is represented by the following structural formula (1-1):

wherein

R 1 , L 1 and Q are the same groups as defined above;

R is a group selected from R 1 , L 1 and Q;

each of n1, n2 and n3 is independently a number ranging from 0 to 2,000, and n1+n2+n3 is a number ranging from 1 to 2,000, with the proviso that in the case of n2=0, at least one R is L 1 , and in the case of n3=0, at least one R is Q.

6. The cosmetic for hair according to claim 1 , wherein said (A) co-modified organopolysiloxane is represented by one of the following structural formulae (1-1-1) or (1-1-2):

wherein

Z is the same group as defined above;

each R is independently a group selected from R 1 , L 1 and Q 1 ;

R 1 and L 1 are the same groups as defined above;

Q 1 is a hydrophilic group selected from the group consisting of the following structural formulae (4-1-2), (4-2-2), (4-3-2) and (4-4-2):

—R 4 (—O—X 1 m —R 5 ) p   (4-2-2)

wherein R 4 , p, X 1 , m and R 5 are the same groups as defined above,

n1 is a number ranging from 10 to 2,000; n2 is a number ranging from 0 to 250; and

n3 is a number ranging from 0 to 250, with the proviso that in the case of n2=0, at least one R is L 1 , and in the case of n3=0, at least one R is Q 1 .

7. The cosmetic for hair according to claim 6 , wherein in said structural formula (1-1-1) or (1-1-2), Z is independently a group selected from divalent organic groups represented by the following general formulae:

—R 6 —

—R 6 —CO—

—R 6 —COO—R 7 —

—CO—R 6 —

—R 6 —COO—R 7 —

—R 6 —CONH—R 7 —

—R 6 —R 7 —

wherein

each R 6 independently represents a substituted or non-substituted, and linear or branched, alkylene or alkenylene group having 2 to 22 carbon atoms or an arylene group having 6 to 22 carbon atoms; and

R 7 is a group selected from the group consisting of divalent organic groups represented by the following formulae:

8. The cosmetic for hair according to claim 6 , wherein in said structural formulae (4-1-2), (4-2-2), (4-3-2) and (4-4-2), p is 1; and R 4 is a group selected from divalent organic groups represented by the following general formulae (5-1), (5-1-2), (5-1-3) and (5-2):

—R 8 —  (5-1)

wherein

each R 8 independently represents a substituted or non-substituted, and linear or branched, alkylene or alkenylene group having 2 to 22 carbon atoms or an arylene group having 6 to 22 carbon atoms.

9. The cosmetic for hair according to claim 1 , further comprising (B) an oil agent.

10. The cosmetic for hair according to claim 1 , further comprising (C) a surfactant.

11. The cosmetic for hair according to claim 1 , further comprising (D) a water-soluble polymer.

12. The cosmetic for hair according to claim 1 , which is in the form of a cosmetic for cleansing hair, a cosmetic for conditioning hair, a cosmetic for styling hair, or a cosmetic for dyeing hair.

13. The cosmetic for cleansing hair according to claim 12 , further comprising (C1) an anionic surfactant and (D1) a cationic water-soluble polymer.

14. The cosmetic for conditioning hair according to claim 12 , further comprising (B2-1) a higher alcohol and (C2) a cationic surfactant.

15. The cosmetic for styling hair according to claim 12 , which is in the form of a liquid, a cream, a solid, a paste, a gel, a mousse, or a spray.

16. The cosmetic for dyeing hair according to claim 12 , further comprising (K) an oxidation hair-dyeing agent and/or (L) a direct dye.