Silicone polymer termination

Details Silicone polymer termination Silicone polymer termination

C - Chemistry, Metallurgy

08

G

402/15

C08G 77/06 (2006.01) C08G 77/32 (2006.01) C08G 77/38 (2006.01)

Patent

CA 1305816

SILICONE POLYMER TERMINATION Abstract Polydiorganosiloxane gum, of the type produced by the alkaline metal catalyzed polymerization of organocyclo- siloxanes can be reduced in hydroxyl content by mixing the gum with an acid or acid producing phosphoric component and a silylamine component, allowing the mixture to react until the hydroxyl groups are lowered to the desired extent, then devolatilizing the gum. The hydroxyl content can be lowered without causing any significant change in the molecular weight of the gum. The hydroxyl content can be lowered to essentially zero.

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