| abstract |
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. n CONSTITUTION: This film is prepared from a copolyester of an m.p. of 210-245°C containing a lubricant (e.g. silica) of a mean particle diameter ≤2.5μm (e.g. copolyethylene terephthalate containing 12mol% copolymerized isophthalic acid) so that it may have a surface orientation factor of 0.060-0.110. n COPYRIGHT: (C)1990,JPO&Japio |