Process for preparing a polyester-modified silicone resin and a curable composition comprising the polyester-modified silicone resin.

摘要

The invention relates to a process for preparing a polyester-modified silicone resin which comprises mixing an alkoxysilane and/or its hydrolyzate, i.e. an alkoxysiloxane, and a polyester resin having at least two hydroxyl groups in the molecule, and subjecting the mixture to hydrolysis and polycondensation reactions in the presence of an acid catalyst. This process is performed by a continuous one-stage reaction sequence including hydrolysis, polycondensation and modification and is simplified. A composition comprising the polyester-modified silicone resin is curable at low temperatures to provide a cured film having good physical properties. The composition further comprising organozinc compounds is significantly improved in heat resistance and color difference.