Monovinylaromatic polymer with improved environmental stress crack resistance.

摘要

The present invention discloses a composition of matter consisting of a high impact polystyrene exhibiting improved environmental stress crack resistance. The HIPS material is formed utilizing a high molecular weight polybutadiene rubber with a Mooney viscosity exceeding about 50 and a gel content of up to about 27%. In addition, the present invention discloses the use of a high Mooney viscosity polybutadiene rubber to manufacture HIPS with a viscosity in the range of about 90 by the use of FDA-approved lubricant-extended rubber.