| abstract |
(57) [Abstract] [Objective] The present invention is a biaxially stretched syndiotactic polystyrene film, more specifically, excellent in transparency and heat resistance, excellent in film surface smoothness, and handleable regardless of film thickness. The present invention relates to a syndiotactic polystyrene-based biaxially stretched film having excellent properties and also excellent abrasion resistance on the film surface. [Structure] A styrene-based polymer having a substantially syndiotactic structure, and has surface haze and internal haze (10 (per μm) is 10% or less, the thermal shrinkage at 200 ° C is 5% or less, and the three-dimensional surface roughness SRa of at least one side is It is characterized in that it is 0.01 μm or more and 0.05 μm or less, the number of protrusions PCC per unit area on the center surface of the roughness is 1200 pieces / mm 2 or more, and the air bleeding speed is 500 seconds or less. Biaxially stretched film. |