Surface-treatment agent for powder for use in cosmetic and cosmetic containing powder treated with the same

1. A cosmetic comprising:

a powder surface-treated with a surface-treatment agent comprising a copolymer, the copolymer comprising:

a carbosiloxane dendrimer structure of the following formula (1):

wherein

Z is a divalent organic group;

p is 1;

each of R 1 and R 2 independently is an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an aralkyl group having 7 to 10 carbon atoms; and

L 1 is a silylalkyl group, in the case of i=1, as set forth by the following formula (2):

wherein

Z and p are the same as defined above;

R 1 and R 2 are the same as defined above;

i is an integer ranging from 1 to 10, which specifies the number of generations of the silylalkyl group;

L i+1 is a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, an aralkyl group having 7 to 10 carbon atoms, and the silylalkyl group, with the proviso that in the case of i=c, in which c is an integer ranging from 1 to 10 and specifies the maximum generation of the silylalkyl group, L i+1 is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an aralkyl group having 7 to 10 carbon atoms; and in the case of i<c, L i+1 is the silylalkyl group; and

a i is an integer ranging from 0 to 2; and

an unsaturated monomer having at least one silicon-bonded alkoxy group;

wherein the carbosiloxane dendrimer structure of formula (1) is the carbosiloxane dendrimer structure of formula (2) when the dendrimer structure has one generation; and at least one oil agent.

2. The cosmetic according to claim 1 , wherein the copolymer is obtained by copolymerizing (A) an unsaturated monomer having the carbosiloxane dendrimer structure of formula (1) and a group selected from the group consisting of:

(i) an acryl or methacryl group-containing organic group of the following general formula:

wherein R 4 is a hydrogen atom or a methyl group; and R 5 is an alkylene group having 1 to 10 carbon atoms,

(ii) an acryl or methacryl group-containing organic group of the following general formula:

wherein R 4 and R 5 are the same as defined above,

(iii) an alkenylaryl group-containing organic group of the following general formula:

wherein R 6 is a hydrogen atom or a methyl group; R 7 is an alkyl group having 1 to 10 carbon atoms; R 8 is an alkylene group having 1 to 10 carbon atoms; b is an integer ranging from 0 to 4; and c is 0 or 1, and

(iv) an alkenyl group having 2 to 10 carbon atoms; and

(B) an unsaturated monomer having at least one silicon-bonded alkoxy group.

3. The cosmetic according to claim 1 , wherein the copolymer is obtained by further copolymerizing (C) at least one unsaturated monomer having no silicon-bonded alkoxy group.

4. The cosmetic according to claim 3 , wherein (C) the at least one unsaturated monomer having no silicon-bonded alkoxy group has a C 1-6 alkyl group.

5. The cosmetic according to claim 3 , wherein the copolymer is obtained by copolymerizing

(A) an unsaturated monomer having the carbosiloxane dendrimer structure of formula (1),

(B) an unsaturated monomer having at least one silicon-bonded alkoxy group, and

(C) at least one of an unsaturated monomer having no silicon-bonded alkoxy group,

in a weight ratio satisfying conditions of {(weight of component (A))/(weight of all the monomers)}:{(weight of component (B))/(weight of all the monomers)}:{(weight of component (C))/(weight of all the monomers)} in the range of (0.02 to 0.7):(0.05 to 0.45):(0.01 to 0.75).

6. The cosmetic according to claim 3 , wherein the copolymer is obtained by copolymerizing

(A) an unsaturated monomer having the carbosiloxane dendrimer structure of formula (1),

(B) an unsaturated monomer having at least one silicon-bonded alkoxy group, and

(C) at least one of an unsaturated monomer having no silicon-bonded alkoxy group,

in a weight ratio satisfying conditions of {(weight of component (A))/(weight of all the monomers)}:{(weight of component (B))/(weight of all the monomers)}:{(weight of component (C))/(weight of all the monomers)} in the range of (0.02 to 0.7):(0.05 to 0.45):(0.01 to 0.75), and {(weight of component (A))/(weight of all the monomers)}>{(weight of component (B))/(weight of all the monomers)}.

7. The cosmetic according to claim 1 , wherein the oil agent is a silicone oil.

8. The cosmetic according to claim 7 , wherein the silicone oil is a hydrophobic silicone oil having a viscosity at 25° C. ranging from 0.65 to 100,000 mm 2 /s.

9. The cosmetic according to claim 7 , wherein the silicone oil is an organopolysiloxane of the following general formula (3) or (4):

wherein

R 9 is a hydrogen atom, a hydroxyl group or a group selected from monovalent non-substituted or fluorine- or amino-substituted C 1-30 alkyl groups, aryl groups, alkoxy groups and groups represented by (CH 3 ) 3 SiO{(CH 3 ) 2 SiO} 1 Si(CH 3 ) 2 CH 2 CH 2 —, wherein

1 is an integer ranging from 0 to 1,000;

a′ is an integer ranging from 0 to 3;

b′ is an integer ranging from 0 to 1,000; and

c′ is an integer ranging from 0 to 1,000, with the proviso that 1≦b′+c′≦2,000,

wherein

R 9 is the same as defined above;

d is an integer ranging from 0 to 8; and

e is an integer ranging from 0 to 8, with the proviso that 3≦d+e≦8.

10. The cosmetic according to claim 1 , further comprising at least one surfactant selected from the group consisting of anionic surfactants, cationic surfactants, nonionic surfactants, amphoteric surfactants and semi-polar surfactants.

11. The cosmetic according to claim 1 , further comprising at least one powder and/or at least one coloring agent.

12. The cosmetic according to claim 11 , wherein the at least one powder has an average particle size ranging from 1 nm to 20 μm, and is selected from the group consisting of inorganic pigment powders, organic pigment powders and resin powders.

13. The cosmetic according to claim 1 , further comprising at least one selected from the group consisting of water-soluble polymers, oil-soluble gelling agents and organo-modified clay minerals.

14. The cosmetic according to claim 1 , further comprising at least one selected from the group consisting of silicone resins, silicone elastomers and organo-modified silicones.

15. The cosmetic according to claim 1 , further comprising at least one UV-ray protective component.

16. A skin care product, a hair product, an antiperspirant product, a deodorant product, a makeup product or a UV-ray protective product comprising the cosmetic as recited in claim 1 .

17. The cosmetic according to claim 1 , wherein the carbosiloxane dendrimer structure is represented by the following formula:

wherein Z and R 2 are the same as defined above, or the following formula:

wherein Z and R 2 are the same as defined above.

18. The cosmetic according to claim 1 , wherein the carbosiloxane dendrimer structure is represented by the following formula (2-2):

wherein Z, R 1 and R 2 are the same as defined above; and a 1 and a 2 indicate an integer ranging from 0 to 2.

19. The cosmetic according to claim 1 , wherein the carbosiloxane dendrimer structure is represented by the following formula (2-3):

wherein Z, R 1 and R 2 are the same as defined above; and a 1 , a 2 , and a 3 indicate an integer ranging from 0 to 2.