SYNDIOTACTIC POLYSTYRENIC BIAXIALLY ORIENTED FILM

摘要

PURPOSE:To obtain a syndiotactic polystyrenic biaxially oriented film excellent in heat resistance and abrasion resistance, describing it in more detail, the syndiotactic polystyrenic biaxially oriented film excellent in dimensional stability at >=150 deg.C with extremely rare occurrence of scuff or abraded powder in running the film. CONSTITUTION:The syndiotactic polystyrenic biaxially oriented film is characterized by comprising a styrenic polymer having substantially a syndiotactic structure and having 0.6-1.8 orientation ratio determined by the following formula and dividing the distribution in the orienting angle of crystallites evaluated by using the crystal diffraction peak at 20.6 deg. in the wide angle X-ray diffraction near the maximum value: The orientation ratio = Ax/Ay (Ax is the intensity of the 1222cm<-1> band when the polarizing direction of the infrared rays coincides with the width direction of the film; Ay is the intensity of the 1222cm<-1> band when the polarizing direction of the infrared rays coincides with the longitudinal direction of the film).