Continuous preparation of rubber-modified polymers of...

Details Continuous preparation of rubber-modified polymers of... Continuous preparation of rubber-modified polymers of...

C - Chemistry, Metallurgy

08

F

400/1115, 400/30

C08F 4/34 (2006.01) C08F 253/00 (2006.01) C08F 279/02 (2006.01)

Patent

CA 1175592

ABSTRACT OF THE DISCLOSURE: A process for the con- tinuous preparation of rubber-modified polymers of vinyl- aromatics, wherein a mixture which contains a monomeric aromatic vinyl compound and an elastomeric polymer synthesized predominantly from 1,3-dienes is reacted in the presence of from 0.5 x 10-2 to 5 x 10-2 mole %, based on monomer, of a per-ester or diacyl peroxide as the free radical initiator and of a mercaptan as a chain transfer agent, the molar ratio of free radical initiator to chain transfer agent being from 3.4 to 0.1. The reaction takes place at an elevated temperature, in two or more process stages, under conditions such that the intrinsic viscosity (determined in 0.5% strength by weight solution in toluene at 23°C) of the matrix-forming polymer, pro- duced from the vinyl-aromatic monomer, is from 65 to 45 ml/g. The polymer obtained is freed from vinyl-aromatic monomer and from solvent, is any, in a devolatilization zone and is used for the production of injection moldings.

383857

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