| abstract |
Stretched moldings (e.g., stretched films, sheets or bottles) of styrene-based resins (e.g., polystyrene) having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000, and a process for the production thereof are disclosed. The stretched moldings are obtained by uniaxially stretching the styrene-based resins at a draw ratio of at least 2 times, or biaxially stretching at a draw ratio of at least 1.2 times in each direction. The stretched moldings are excellent in heat resistance, chemical resistance, solvent resistance, electric insulating properties, mechanical strength and so forth, and thus can be used as food wrapping materials, housing materials for electric or electronic parts, and so forth. |