Organic silicon compounds and cosmetic compositions.

摘要

Novel organic silicon compounds having a UV absorbing benzotriazole or benzophenone skeleton are provided comprising R<1>3SiO1/2 and SiO2 units as essential units, 0 to 20 mol% of R<2>SiO3/2 and R<3>2SiO units, and 0 to 20 mol% of R<3>2SiO units. The siloxane units are present in a molar ratio: (R<1>3SiO1/2 + R<2>SiO3/2 + R<3>2SiO)/SiO2 of from 0.5 to 1.5. A benzotriazole or benzophenone-bearing group constitutes 1 to 33 mol% of the total quantity of the organic groups represented by R<1>, R<2> and R<3> while the remainder is a monovalent saturated or unsaturated organic group or groups having 1 to 18 carbon atoms. Cosmetic compositions containing the same compounds have improved UV absorbing capacity.