HIGH IMPACT RESISTANT, HIGH GLOSS, AND HIGH ENVIRONMENTAL STRESS CRACK RESISTANT POLYMERIC COMPOSITIONS

摘要

A polymeric composition is provided which exhibits a combination of high glossand high environmental stress crack resistance, comprising:(a) high impact polystyrene having a gloss at 60 degrees of greater than85% and an impact resistance of greater than 0.7 ft-lb/inch,(b) high density polyethylene which has a density greater than or equal toabout 0.94 g/cm3, and which has a stress exponent less than or equal toabout 1.70; and(c) a compatibilizing polymer for components (a) and (b), selected fromthe group consisting of diblock styrene butadiene copolymers, triblockstyrene butadiene copolymers, diblock styrene isoprene copolymers,triblock styrene isoprene copolymers, and mixtures thereof,wherein the gloss at 60 degrees of the composition is greater than or equal toabout 85%, and the environmental stress crack resistance measured in minutesuntil breakage at 1000 psi is greater than about 60.