Silicone type cinnamic acid derivative, preparation method thereof, uv-ray absorber, and external skin treatment agent.
申请人:SHISEIDO COMPANY LIMITED
公开号:EP0350314A2
公开(公告)日:1990-01-10
A silicone type cinnamic acid derivative which is a siloxane having at least one unit represented by the formula (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.
一种有机硅型肉桂酸衍生物,它是一种硅氧烷,至少有一个单元由式(I)表示:
且硅氧烷中可能存在的其他单元由式表示:
O(4-m)/2SiR³m,其中 R¹ 代表具有 1 至 4 个碳原子的烷基、苯基或三甲基硅氧烷基,R² 代表至少具有两个碳原子的二价烃基,其中可包括杂原子 O.O.、X 是烷氧基,n 是 0 至 3 的整数,a 是 2 或 3 的整数,R³ 是具有 1 至 4 个碳原子的烷基、苯基或三甲基硅氧基,m 是 0 至 3 的整数。