| abstract |
(57) [Abstract] [Objective] The present invention is a syndiotactic polystyrene biaxially oriented film, more specifically, excellent in smoothness of the film surface and excellent in handling property regardless of film thickness, and further in running property and The present invention relates to a syndiotactic polystyrene biaxially oriented film having good abrasion resistance. [Structure] It consists essentially of a styrene polymer having a syndiotactic structure, has a three-dimensional surface roughness SRz of 1.2 μm or less on at least one side, and a ratio of SRmax to SRz of 1. A polystyrene-based biaxially oriented film, which is 5 or less, has an S Δa of 0.004 or more and 0.04 or less, and has an air bleeding speed of 900 seconds or less. |