HIGH-IMPACT POLYSTYRENE COMPOSITION AND PRODUCTION THEREOF

摘要

HIGH-IMPACT POLYSTYRENE COMPOSITION AND PRODUCTION THEREOF High-impact polystyrene composition is produced by radical polymerization, e.g. bulk or bulk-suspension polymerization, of styrene dissolving 2 to 20% by weight of one or more polybutadienes prepared by solution polymerization using an organic lithium compound as catalyst, said polybutadienes having 1) 1,2-vinyl. content of more than 15 to 35% and cis-1,4 content of 20 to 85%, and2) Mooney viscosity of 25 to 85, 5% styrene solution viscosity at 25.degree.C being 50 to 200 cps and between 1.5 and 3.0 of the Mooney viscosity. The high-impact polystyrenes of the present invention are suitable for producing various articles of practical use by various molding and shaping methods, as injection and extrusion molding and the like, particularly injection molded articles for use at low temperatures.