C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
260/442.7
C07F 7/08 (2006.01) C08G 77/08 (2006.01) C08G 77/10 (2006.01) C08G 77/14 (2006.01)
Patent
CA 1137990
A PROCESS FOR THE PRODUCTION OF SILICON- FUNCTIONAL POLYORGANOSILOXANES ABSTRACT OF THE DISCLOSURE In the production of linear and branched equilibrated acyloxy-containing organopolysiloxanes by reacting a chlorosilane of the formula RaR'bSiCl(4-a-b) in which a is 0,1,2 or 3, b is 0,1,2 or 3, and a+b ? 3, or a partial hydrolysate thereof, with at least one organosiloxane containing the components R2R"-SiO1/2, R R1"-SiO, R"-SiO3/2 and SiO2 in which R and R" each independently is H or an optionally halogen- or cyano-substituted ` monovalent hydrocarbon radical having up to 12 carbon atoms, and Le A 19 341 -US Abstract continued R" is Cl, OH, H or an optionally halogen- or cyano-substituted monovalent hydrocarbon radical having up to 12 carbon atoms, in the presence of an equilibration catalyst, the improvement which comprises employing as the equilibration catalyst a salt of a fluorinated alkane sulphonic acid plus a monobasic carboxylic acid, the total number of Si-Cl groups exceeding the total number of Si-OH groups in the reactants and the monobasic carboxylic acid being present in at least about 1.1 times the molar amount of silicon-bound Cl atoms. Advantageously the salt of the fluorinated alkane sulphonic acid is the potassium salt of octafluorobutane sulphonic acid and it is used in about 0.3 to 0.7% by weight of the silicon compound reactants, The equilibration is effected at a tem- perature up to about 135°C, and the monobasic carboxylic acid is acetic acid. Le A 19 341-US
342476
de Montigny Armand
Niederprum Hans
Fetherstonhaugh & Co.
Ge Bayer Silicones Gmbh & Co. Kg
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