Siloxane copolymers containing alkenyl groups, their...

Details Siloxane copolymers containing alkenyl groups, their... Siloxane copolymers containing alkenyl groups, their...

C - Chemistry, Metallurgy

08

G

C08G 77/20 (2006.01) C08G 77/50 (2006.01) C08L 83/07 (2006.01) C08L 83/14 (2006.01) C09D 183/10 (2006.01) C09D 183/14 (2006.01)

Patent

CA 2073813

Siloxane copolymers containing alkenyl groups are prepared by reacting an organic compound (1) containing at least two aliphatic double bonds of the general formula R2(CR3=CH2)x in which R2 is a divalent, trivalent or tetravalent hydrocarbon radical having from 1 to 25 carbon atoms per radical, R3 is a hydrogen atom or an alkyl radical having from 1 to 6 carbon atoms per radical and x is 2, 3 or 4, with an organopolysiloxane (2) having an average of more than one Si-bonded hydrogen atom per molecule, in the presence of a catalyst (3) which promotes the addition of Si-bonded hydrogen to an aliphatic double bond, in which the ratio between the aliphatic double bond in the organic compound (1) and the Si-bonded hydrogen in the organopolysiloxane (2) is such that the alkenyl containing siloxane copolymers thus obtained have an average of more than one alkenyl group per mole- cule of the formula -CR3=CH2, in which R3 is the same as above.

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