PLASTIC FILM AND METHOD FOR MANUFACTURING SAME

摘要

　Provided are a plastic film containing a syndiotactic polystyrene-based resin, and a method for manufacturing the same, the plastic film having sufficiently excellent heat-resistant dimensional stability and heat deformation resistance. A biaxially oriented plastic film containing a syndiotactic polystyrene-based resin, the coefficient of thermal expansion thereof being 80 ppm/°C or lower when the film is heated from 50°C to 100°C under conditions of a tensile load of 5 gf/2 mm width and a temperature increase rate of 10°C/minute, and the absolute value of the thermal shrinkage thereof at 180°C being 3.0% or less. A method for manufacturing a plastic film, comprising manufacturing a precursor film containing a syndiotactic polystyrene-based resin, and then subjecting the precursor film to a simultaneous biaxial stretching step including at least a heat treatment step.