| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyester film excellent in formability, heat resistance and taste-keeping capability and suitable for a metallic can produced by forming and processing, by incorporating particles with a specified shape into a polyester. SOLUTION: Organic or inorganic particles in an amount of 0.005-10wt.% are incorporated into a polyester of which at least 93wt.% of the constituent units comprise ethylene terephthalate units and/or ethylene naphthalate units to give a biaxially oriented polyester film for forming a container. The particles used comprise those having a volume-mean particle diameter of 0.005-5.0μm, a relative standard deviation, represented by the formula (whereinσis a relative standard deviation; D is a number average particle diameterμm; Di is a particle diameterμm; and n is the number of particles), of at most 0.5, a length/width ratio of (1.0 to 1.2):1, and a Mohs hardness of less than 7. A film excellent also in laminating characteristics and scraping resistance can be obtained by thus controlling the structure of film. |
