Preparation of equilibrated acyloxy and chlorine-containing...

Details Preparation of equilibrated acyloxy and chlorine-containing... Preparation of equilibrated acyloxy and chlorine-containing...

C - Chemistry, Metallurgy

07

F

260/442.7

C07F 7/08 (2006.01) C08G 77/10 (2006.01) C08G 77/14 (2006.01)

Patent

CA 1128541

PREPARATION OF SILICON-FUNCTIONAL POLYORGANOSILOXANES Abstract of the Disclosure A process for the preparation of an equilibrated acyloxy-containing organopolysiloxane comprising reacting at a temperature of up to 135°C a chlorosilane of the formula RaR'bSiCl(4-a-b) wherein a = 0, 1, 2 or 3 b = 0, 1, 2 or 3, and a + b is at most 3, or a partial hydrolysis product thereof, with at least one organosiloxane containing the units [R2R"-SiO1/2] [RR"-SiO] [R"-SiO3/2] [SiO2] wherein R and R' each independently is hydrogen or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, and R" is hydrogen, chlorine, hydroxyl, or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, in the presence of a proton acid siloxane-equilibration catalyst,and at least about 1.1 times the molar amount of a monobasic carboxylic acid based on the silicon-bonded chlorine atom, the number of all the Si-Cl groups in the reactants exceeding the number of all the Si-OH groups. Le A 18 597

319929

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