Bicontinuous microemulsion composition and cosmetic

1. A bicontinuous microemulsion composition, comprising:

(A) polyglycerin group-containing organo(poly)siloxane shown by the following general formula (1):

wherein

each R 1 independently represents an alkyl group having 1 to 10 carbon atoms or a phenyl group,

R 2 represents a group having a polyglycerin structure shown by the following formula (2) or the following formula (3),

each R 3 independently represents R 1 or R 2 ,

“a” is a number of 0 to 6 and “b” is a number of 0 to 4 satisfying that a+b is 0 to 10, with the proviso that when “b” is 0, at least one of R 3 is R 2 :

wherein

R 4 represents an alkylene group having 2 to 10 carbon atoms or an aralkylene group having 7 to 10 carbon atoms,

“c” is a number of 0 to 10, and “d” is a number of 2 to 6;

(B) at least one kind of oil selected from the group consisting of silicone oils having a viscosity of 20 mm 2 /s or less at 25° C., volatile hydrocarbon oils, and ester oils; and

(C) water.

2. The bicontinuous microemulsion composition according to claim 1 , wherein each R 1 in the general formula (1) independently represents an alkyl group having 1 to 5 carbon atoms in the (A) polyglycerin group-containing organo(poly)siloxane.

3. The bicontinuous microemulsion composition according to claim 2 , wherein, in the (A) polyglycerin group-containing organo(poly)siloxane of the general formula (1),

R 2 is the same as described above,

R 3 is R 1 ,

“a” is a number of 0 to 2 and “b” is 1 satisfying that a+b is 1 to 3,

R 4 in the formulae (2) and (3) is the same as described above, and

the formula (2) is such that “c” is 0 and “d” is a number of 2 to 3; and

the bicontinuous microemulsion composition is oily.

4. The bicontinuous microemulsion composition according to claim 2 , wherein, in the (A) polyglycerin group-containing organo(poly)siloxane of the general formula (1),

R 2 and R 3 are the same as described above,

at least one of R 3 is R 2 ,

“a” is a number of 2 to 6 and “b” is 0 satisfying that a+b is 2 to 6,

R 4 in the formulae (2) and (3) is the same as described above, and

the formula (2) is such that “c” is 0 and “d” is a number of 3 to 5; and

the bicontinuous microemulsion composition is oily.

5. The bicontinuous microemulsion composition according to claim 2 , wherein, in the (A) polyglycerin group-containing organo(poly)siloxane of the general formula (1),

R 2 is a group shown by the formula (2),

R 3 is R 1 ,

“a” is a number of 0 to 1 and “b” is a number of 1 to 2 satisfying that a+b is 1 to 3, and

the formula (2) is such that R 4 is the same as described above,

“c” is 0, and

“d” is a number of 4 to 6; and

the bicontinuous microemulsion composition is aqueous.

6. The bicontinuous microemulsion composition according to claim 2 , wherein, in the (A) polyglycerin group-containing organo(poly)siloxane of the general formula (1),

R 2 is a group shown by the formula (2),

R 3 is R 1 ,

“a” is a number of 0 to 2 and “b” is a number of 2 to 4 satisfying that a+b is 2 to 4, and

the formula (2) is such that R 4 is the same as described above,

“c” is 0, and

“d” is a number of 2 to 3; and

the bicontinuous microemulsion composition is aqueous.

7. The bicontinuous microemulsion composition according to claim 2 , wherein, in the (A) polyglycerin group-containing organo(poly)siloxane of the general formula (1),

R 2 and R 3 are the same as described above,

at least one of R 3 is R 2 ,

“a” is a number of 0 to 1 and “b” is a number of 0 to 1 satisfying that a+b is 0 to 2,

R 4 in the formulae (2) and (3) is the same as described above, and

the formula (2) is such that “c” is 0 and “d” is a number of 3 to 6; and

the bicontinuous microemulsion composition is aqueous.

8. The bicontinuous microemulsion composition according to claim 2 , wherein, in the (A) polyglycerin group-containing organo(poly)siloxane of the general formula (1),

R 2 and R 3 are the same as described above,

“a” is a number of 0 to 3 and “b” is a number of 0 to 3 satisfying that a+b is 0 to 6,

R 4 in the formulae (2) and (3) is the same as described above, and

the formula (2) is such that “c” is a number of 2 to 10 and “d” is a number of 2 to 6; and

the bicontinuous microemulsion composition is aqueous.

9. The bicontinuous microemulsion composition according to claim 1 , wherein R 1 in the general formula (1) represents a methyl group in the (A) polyglycerin group-containing organo(poly)siloxane.

10. The bicontinuous microemulsion composition according to claim 1 , wherein, in the (A) polyglycerin group-containing organo(poly)siloxane of the general formula (1),

each R 3 independently represents an alkyl group having 6 to 10 carbon atoms or a phenyl group,

R 2 is a group shown by the formula (2),

“a” is a number of 0 to 2 and “b” is a number of 2 to 4 satisfying that a+b is 2 to 4, and

the formula (2) is such that R 4 is the same as described above,

“c” is 0, and

“d” is a number of 2 to 3; and

the bicontinuous microemulsion composition is oily.

11. A cosmetic comprising the bicontinuous microemulsion composition according to claim 1 .

12. A cosmetic comprising the bicontinuous microemulsion composition according to claim 2 .

13. A cosmetic comprising the bicontinuous microemulsion composition according to claim 3 .

14. A cosmetic comprising the bicontinuous microemulsion composition according to claim 4 .

15. A cosmetic comprising the bicontinuous microemulsion composition according to claim 5 .

16. A cosmetic comprising the bicontinuous microemulsion composition according to claim 6 .

17. A cosmetic comprising the bicontinuous microemulsion composition according to claim 7 .

18. A cosmetic comprising the bicontinuous microemulsion composition according to claim 8 .

19. A cosmetic comprising the bicontinuous microemulsion composition according to claim 10 .

20. The bicontinuous microemulsion composition according to claim 1 , wherein the bicontinuous microemulsion composition does not contain water-soluble monovalent alcohol or polyvalent alcohol.