Silicone type cinnamic acid derivative, preparation method...

Details Silicone type cinnamic acid derivative, preparation method... Silicone type cinnamic acid derivative, preparation method...

C - Chemistry, Metallurgy

07

F

167/125, 167/314

C07F 7/18 (2006.01) A61K 8/58 (2006.01) A61Q 17/04 (2006.01) C07F 7/08 (2006.01)

Patent

CA 1332240

SILICONE TYPE CINNAMIC ACID DERIVATIVE, PREPARATION METHOD THEREOF, UV-RAY ABSORBER, AND EXTERNAL SKIN TREATMENT AGENT ABSTRACT OF THE DISCLOSURE A silicone type cinnamic acid derivative which is a siloxane having at least one unit represented by the formula (I): Image (I) and having the other units which may exist in the siloxane being represented by the formula: O(4-m)/2SiR3m wherein R1 represents an alkyl group having 1 to 4 carbon atoms, a phenyl group, or a trimethylsiloxy group, R2 is a divalent hydrocarbon group having at least two carbon atoms, which may include a heteroatom O, X is an alkoxy group, n is an integer of 0 to 3, a is an integer of 2 or 3, R3 is an alkyl group having 1 to 4 carbon atoms, a phenyl group, or a trimethylsiloxy group, and m is an integer of 0 to 3. The novel derivatives of the invention are useful in external skin treatment compositions, especially for UV-ray absorption to prevent sunburn.

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