PURPOSE: To improve transparency and impact resistance, by blending two block copolymers composed of a conjugated diolefin and an arom, vinyl-substd. compd. with an inpact-resistant rubber-modified styrene copolymer and a non- rubber-modified styrene copolymer.
CONSTITUTION: A compsn. is formed from 3W35wt% block copolymer having an arom, vinyl-substd. compd. content of 10W55wt%, composed of a conjugaged diolefin and an arom. vinyl-substd. compd., 5W50wt% block copolymer having an arom. vinyl-substd. compdn. content of more than 55wt%, but less than 56wt% and a 1,2-bonded vinyl unit content of not higher than 15%, composed of a conjugaged diolefin and an arom. vinyl-substd. compd. wherein not more than 75wt% of the arom. vinyl-substd. compd. in the block copolymer exists as a block homopolymer segment, 2W10wt% impact-resistant rubber-modified styrene polymer, and 20W90wt% non-rubber-modified styrene polymer.
MORITA HIDEO
IEMORI AKIO
| JPS5670044A | 1981-06-11 |