Silicone resin, making method, and cosmetics
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsHiroomi Iyoku, Yuji Ando
Life of this patent
Estimating the term…
Abstract
A silicone resin represented by formula (1) and having a Mw of 1,000-8,000 is useful in cosmetics. [(C6H5)3SiO1/2]a[R13SiO1/2]b[R22SiO2/2]c[R3SiO3/2]d[SiO4/2]e (1) R1 is a C1-C8 alkyl group, C6-C12 aryl group (exclusive of phenyl) or C1-C8 fluorinated alkyl group, R2 and R3 are each independently a C1-C8 alkyl group, C6-C12 aryl group or C1-C8 fluorinated alkyl group, a=0-0.2, b=0.1-0.5, c=0-0.2, d=0.01-0.5, e=0-0.6, a+b+c+d+e=1.0, at least one phenyl group is included in the molecule. A film of the silicone resin has a refractive index of at least 1.48.
Claims6
A method for preparing a silicone resin represented by the compositional formula (1) and has a weight average molecular weight of 1,000 to 8,000,
- [(C6H5)3SiO1/2]a[R13SiO1/2]b[R22SiO2/2]c[R3SiO3/2]d[SiO4/2]e (1)
- wherein R1 is a group, exclusive of phenyl, selected from among C1-C8 alkyl groups, C6-C12 aryl groups and C1-C8 fluorinated alkyl groups, R2 and R3 are each independently a group selected from among C1-C8 alkyl groups, C6-C12 aryl groups and C1-C8 fluorinated alkyl groups, a is a number of 0.01 to 0.2, b is a number of 0.1 to 0.5, c is a number of 0 to 0.2, d is a number of 0.01 to 0.5, e is a number of 0 to 0.6, a+b+c+d+e is equal to 1.0, R1 to R3 and a to e are selected such that at least one phenyl group is included in the molecule, and
- a film of the silicone resin having a refractive index of at least 1.48;
- the method comprising the following steps (i) and (ii):
- (i) effecting hydrolytic condensation of at least one organosilicon compound selected from the general formulae (2) and (3) with at least one compound selected from silanes having the general formulae (4), (5) and (6) and partial hydrolytic condensates thereof in a solventless system or a solvent,
- R13SiOSiR13 (2)
- R13SiOH (3)
- wherein R1 is as defined above,
- (R4O)2SiR22 (4)
- (R4O)3SiR3 (5)
- (R4O)4Si (6)
- wherein R2 and R3 are as defined above, R4 is each independently hydrogen or a substituted or unsubstituted monovalent hydrocarbon group;
- and
- (ii) adding triphenylsilanol and a solvent to the hydrolytic condensate, and effecting condensation of the hydrolytic condensate with triphenylsilanol in the presence of a basic catalyst.
Dependencies are inferred from the claim text.