Preparation of silicone resins

In a process for the preparation of a solution of a stable silicone resin comprising SiO 4/2 units and units selected from RSiO 3/2 , RR′SiO 2/2 , and RR′ 2 SiO 1/2 units, where R is an alkyl, alkenyl, substituted alkyl, cycloalkyl, aryl or aralkyl group imparting desired physical or chemical proper...

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Bibliographic Details
Main Authors MacKinnon, Iain, Chevalier, Pierre, Ou, Duan
Format Patent
LanguageEnglish
Published 15.07.2004
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Summary:In a process for the preparation of a solution of a stable silicone resin comprising SiO 4/2 units and units selected from RSiO 3/2 , RR′SiO 2/2 , and RR′ 2 SiO 1/2 units, where R is an alkyl, alkenyl, substituted alkyl, cycloalkyl, aryl or aralkyl group imparting desired physical or chemical properties to the resin, for example a thermally labile group, and each R′ is a different alkyl, substituted alkyl, cycloalkyl, aryl or aralkyl group, or a hydrogen atom, a hydrosiloxane resin comprising HSiO 3/2 units and the said units selected from RSiO 3/2 , RR′SiO 2/2 , and RR′ 2 SiO 1/2 units is treated with a base to condense at least some of the HSiO 3/2 units to form SiO 4/2 units. The base is preferably a solution of an alkali metal salt of a weak acid, such as sodium acetate.