STYRENIC POLYMER AND MOLDED ARTICLE

摘要

A highly syndiotactic polystyrene (SPS) which has a weight-average molecular weight of 1x104 to 2x106 and wherein the weight fraction of the extract obtained by dissolving SPS in 1,2,4-trichlorobenzene, cooling the solution to yield a gel, and extracting the gel with methylene chloride is 10 wt.% or less. The SPS can provide oriented films having high breaking strength and molded articles that have high Izod impact strength, thermal deformation temperature and breaking strength after being exposed to heat for long, and do not undergo any reduction in surface luster even after being used intermittently or continuously at high temperatures.