Silethynyl-siloxane copolymers and method of making them

Details Silethynyl-siloxane copolymers and method of making them Silethynyl-siloxane copolymers and method of making them

C - Chemistry, Metallurgy

08

G

402/9

C08G 77/08 (2006.01) C08G 77/20 (2006.01) C08G 77/42 (2006.01) C08G 77/50 (2006.01)

Patent

CA 2021014

A method of making silethynyl-siloxane copolymers having R2SiC~C units and R2SiO units wherein each R denotes H or a C1-16 hydrocarbon or substituted hydrocarbon group, comprises ring-opening copolymerisation in the presence of a catalytic amount of a lithium compound, of cyclic siloxanes and cyclic silethynyl polymers. Novel silethynyl-siloxane copolymers of the formula (see fig. I) are also disclosed wherein R' denotes -C~CH or R and ~ and ~ are at least 1.

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