Process for producing polystyrene

Details Process for producing polystyrene Process for producing polystyrene

C - Chemistry, Metallurgy

08

F

400/2041

C08F 279/02 (2006.01) C08F 2/02 (2006.01) C08F 4/48 (2006.01) C08F 212/08 (2006.01)

Patent

CA 1230694

ABSTRACT OF THE DISCLOSURE In a process for producing a high impact poly- styrene comprising the radical polymerization of styrene in the presence of a butadiene rubber, the improvement which comprises, the butadiene rubber being a highly branched polymer prepared by homopolymerizing 1,3- butadiene or copolymerizing 1,3-butadiene and styrene in the presence of an organolithium compound and a Lewis base compound, followed by further reacting the resulting polymer with a multifunctional halogen compound; in the butadiene rubber, the average content of 1,2-bonds being 18 to 32 mole % based on the total bonded butadiene, the content of bonded styrene being up to 10% by weight, and the content of branched polymer chains being at least 60% by weight; the butadiene rubber exhibiting a Mooney viscosity of 40 to 90 at 100°C and a solution viscosity in styrene of 60 to 90 cps at 25°C and at a concentration of 5% by weight; and the styrene polymerization being carried out so that the content of the butadiene rubber in the product polystyrene lies between 3 and 20% by weight.

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