BIAXIALLY ORIENTED POLYSTYRENE FILM

摘要

PURPOSE: To prepare a biaxially oriented polystyrene film having few coarse protrusions on the surface and being excellent in transparency, slip, withstand voltage properties and abrasion resistance by mixing a specified surface- irregularity-forming agent with a surface modifier. CONSTITUTION: This film is the one made from a syndiotactic polystyrene resin and containing inorganic and/or organic surface-irregularity-forming agents and a polystyrene-based surface modifier. It is desirable that the polystyrene resin has a syndiotactic structure of a diad fraction of 85% or above and a pentad fraction of 50% or above. It is desirable that the surface-irregularity- forming agent has a mean particle diameter of 0.01-2.0μm and that it is used in an amount of 0.005-0.2wt.% or above. An example of the surface modifier used is the one having a polystyrene skeleton which has an average molecular weight of 5000 or above and is modified with an iminium ion at one molecular end, and it is desirably used in an amount of 0.1-10wt.% based on the surface- irregularity-forming agent.