Process for the preparation of organopolysiloxane resins

Details Process for the preparation of organopolysiloxane resins Process for the preparation of organopolysiloxane resins

C - Chemistry, Metallurgy

08

L

C08L 83/04 (2006.01) C08G 77/06 (2006.01) C08G 77/20 (2006.01)

Patent

CA 2078918

PROCESS FOR THE PREPARATION OF ORGANOPOLYSILOXANE RESIN Abstract of the Disclosure A process for preparing an organopolysiloxane resin, which comprises reacting in a first stage at least one silane of the formula RaSi(OR1)4-a (I) in which a is 0, 1, 2 or 3, R is a monovalent organic radical, and/or a partial hydrolyzate thereof, with the proviso that at least one silane of formula (I) in which a is equal to 0 or 1, and/or a partial hydrolyzate thereof, is employed, and, if appro- priate, an organo(poly)siloxane with water in the presence of acid and, if appropriate, other substances, in a second stage reacting the reaction mixture obtained from the first stage in the presence of base and, if appropriate, other substances, and in a third stage adding with stirring, the reaction mixture obtained in the second stage into water, and if appropriate mixed with additives.

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