Polystyrene modified with silicone rubber powder

Details Polystyrene modified with silicone rubber powder Polystyrene modified with silicone rubber powder

C - Chemistry, Metallurgy

08

G

C08G 77/04 (2006.01) C08F 290/14 (2006.01) C08L 25/02 (2006.01) C08L 25/06 (2006.01) C08L 55/00 (2006.01) C08L 83/04 (2006.01)

Patent

CA 2084534

POLYSTYRENE MODIFIED WITH SILICONE RUBBER POWDER ABSTRACT A crumb-like silicone rubber powder is uniformly dispersed in a polystyrene polymer using conventional equipment, such as a twin screw extruder, to provide a resin having up to a ten fold improvement in impact strength over the unmodified polymer. The novel silicone rubber powder of the invention is prepared by isolating the particles obtained from a polymerization of an unsaturated monomer in the presence of an aqueous emulsion of a hydroxyl-functional polydiorganosiloxane which has been precured using an organotin curing catalyst and a crosslinker which contains unsaturated functionality.

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