| 摘要 |
Process for preparing organosiloxanes having in the molecule at least one unit of the general formula <IMAGE> in 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 OH or alkoxy, a is 0, 1 or 2, b is 0 or 1 and n is 1, 2 or 3. The process comprises reacting an organosiloxane having silicon-bonded hydroxyalkyl or hydroxyaryl substituents with the appropriate acid chloride. The organosiloxanes absorb ultra violet radiation and are useful as sunscreen agents. Also claimed are certain novel siloxanes which can be obtained by the said process.
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