申请人:Dow Corning Limited
公开号:EP0157481A2
公开(公告)日:1985-10-09
Process for preparing organosiloxanes having in the mol- cute at least one unit of the general formula
which R is C1-4 alkyl or a phenyl group, R' represents an aliphatic or aromatic group composed of carbon, hydrogen and optionally oxygen and having a valency of n + 1, Y represents )H or alkoxy, is 0, 1 or 2, is 0 or 1 and n is 1, 2 or 3. The process comprises reacting an organosiloxane having silicon- onded hydroxyalkyl or hydroxyaryl substituents with the appropriate acid chloride.
The organosiloxanes absorb ultra violet radiation and are seful as sunscreen agents.
Also claimed are certain novel siloxanes which can be ob- ained by the said process.
制备有机硅氧烷的工艺,其通式中至少有一个单元,其中 R 是 C1-4 烷基或苯基,R' 代表由碳、氢和氧组成的脂肪族或芳香族基团,其价为 n + 1,Y 代表 )H 或烷氧基,为 0、1 或 2,为 0 或 1,n 为 1、2 或 3。 该工艺包括使具有硅基羟烷基或羟芳基取代基的有机硅氧烷与适当的酸氯化物反应。 有机硅氧烷吸收紫外线辐射,可用作防晒剂。 还要求获得某些新型硅氧烷,这些硅氧烷可通过上述工艺制得。