| 摘要 |
PURPOSE:To offer the titled film having specified physical properties excellent in all of oil-fluidity, resistance to oily swelling, manual splittability, slidability, depositability and resistance to heat contraction, by letting the film contain a glass fiber having a specified size. CONSTITUTION:Polypropylene (A) is let contain 1-20wt% of a glass fiber (B) (preferably having a surface treated with a coupling agent such as silane) having diameter of 5-50mu, length of 10-200mu and a ratio of length to diameter being 2-15, to obtain an objective film having complex refraction of 0-0.02 and apparant density of 0.6-0.9g/m. In order to obtain the objective film, the powder of the component A is uniformly mixed with the component B, extruded into a gut shape under a molten condition, cut into pieces and then cooled. The resultant pellet is formed into an unstretched film by hot-extrusion and cooling. The unstretched film is finally biaxially stretched. |
