Method for producing a polydiorganosiloxane having a pendent...

Details Method for producing a polydiorganosiloxane having a pendent... Method for producing a polydiorganosiloxane having a pendent...

C - Chemistry, Metallurgy

08

G

402/27

C08G 77/08 (2006.01) C08G 77/20 (2006.01) C08G 77/44 (2006.01)

Patent

CA 1312168

ABSTRACT OF THE DISCLOSURE Polydlorganosiloxanes which have a pendant alkenyl radical in the middle of the molecular chain are prepared by a nonequilibrium, living polymerization of cyclic trisiloxanes using an organopolysiloxane alkali metal salt of the formula Image where M is lithium, sodium, or potassium, which takes place under substantially anhydrous conditions, and the polymerization is terminated with an end-capping reaction to produce a polydiorganosiloxane of the formula Image where R1 is an alkenyl radical. These polymers can be used to make graft copolymers and can be made more functional when the ends are capped with functional groups.

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