Synthese d'oligomeres de polydimethylsiloxane reticulables—partie I. introduction de groupements acryliques sur des polydimethylsiloxanes possedant des groupements 3-hydroxypropyle

Abstract

We describe the synthesis of polydimethylsiloxane with 3-hydroxypropyl groups in the chain or at the ends by copolycondensation of 3-acetoxypropyl methyl dichlorosilane with various α, ω-disilanols. The length of the chain was controlled by addition of vinyl or 3-acetoxy propyl monochloro dimethyl silane. Methacryoyl chloride was then grafted to give a polyunsaturated product. These oligomers were crosslinked by u.v. with reactive diluents and photoinitiators to give products with very good “release properties” especially with the longer siloxane chains.