Fluorosilicone copolymers and process for the preparation thereo

Details Fluorosilicone copolymers and process for the preparation thereo Fluorosilicone copolymers and process for the preparation thereo

1975-05-05

1976-08-10

Jacobs, Lewis T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 306SB, 260 308R, 260 324, 260 465R, C08K 515

Patent

active

039741206

ABSTRACT:
Diorganopolysiloxane copolymers having a viscosity from 100,000 to 200,000,000 centipoise at 25.degree.C., are produced by (a) forming an admixture of (i) a cyclic alkyl trifluoropropyl trisiloxane, (ii) a second cyclic diorgano trisiloxane, (i) being present in an amount of 40 to 85 mol % of the total of (i) and (ii), (iii) from 5 to 300 parts per million of an alkyl lithium catalyst, the alkyl component containing from 1 to 12 carbon atoms, and (iv) an aprotic solvent, said aprotic solvent being capable of dissolving both the trimers (i) and (ii) and the copolymer product, (b) reacting said admixture at a temperature between 0.degree.C. and 150.degree.C. to form the copolymer, and (c) recovering the copolymer from the reaction mixture.

REFERENCES:
patent: 3483270 (1969-12-01), Bostick

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