| 摘要 |
PURPOSE:To obtain the title film excellent in pinhole resistance, deep drawability, bending processability, etc., by constituting it from a copolyester having a specified melting point and containing a lubricant so as to give thereto a specified surface orientation factor. CONSTITUTION:This film is prepared from a copolyester of an m.p. of 210-245 deg.C containing a lubricant (e.g. silica) of a mean particle diameter <=2.5mum (e.g. copolyethylene terephthalate containing 12mol% copolymerized isophthalic acid) so that it may have a surface orientation factor of 0.060-0.110. |
