Process for producing polydiorganosiloxane based graft...

Details Process for producing polydiorganosiloxane based graft... Process for producing polydiorganosiloxane based graft...

C - Chemistry, Metallurgy

08

G

C08G 77/442 (2006.01) C08F 283/12 (2006.01) C08F 290/14 (2006.01)

Patent

CA 2089284

08CP12056 ABSTRACT OF THE DISCLOSURE A process for producing a polydiorganosiloxane based graft copolymer is provided. The process involves producing an emulsion of crosslinked polydiorganosiloxane by admixing dihydroxyfunctional polydiorganosiloxane, an emulsifying agent, and water; polymerizing the polydiorganosiloxane in the presence of an acid catalyst, a cross linking agent and a grafting agent to form silicone rubber particles having functional sites, and graft polymerizing a vinyl functional monomer onto the resulting silicone particles. The process provides several advantages in a rubber particle size control thereby resulting in better control of the properties of the resulting graft copolymer.

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