STRETCHED POLYSTYRENE FILM AND PROCESS FOR THE PREPARATION OF STRECHTED POLYSTYRENE FILM

摘要

A stretched polystyrene film made from a styrene resin composition comprising 70 to 100 wt.% of a highly syndiotactic styrene polymer, having a crystallinity of 35 % or above and a residual monomer content of 200 ppm or below, and containing at most 1,000 per cm<3> of foreign particles having a size of 9 mu m or above; a process for the preparation of a stretched polystyrene film comprising filtering and extruding a specific amount of the styrene resin composition in a molten state, subjecting the extrudate to cooling and biaxial stretching, and thermally treating the stretched film thus formed in a degree A of treatment of 1 x 10<-1> or above but below 5 x 10<2>. The obtained film is excellent in printability, peel strength after metallization and so forth, and the process can efficiently give a stretched polystyrene film excellent in performance.