| abstract |
It is provided that a biaxially stretched polyester film that is excellent in linearly tearing property over the full width of the film, moisture resistance, pinhole resistance, and bag breakage resistance while maintaining film transparency, and in particular, and that can be particularly suitably used for retort pouch packaging and packaging for water containing material. A biaxially stretched polyester film comprising: a thermoplastic resin composition containing not less than 60% by weight of polybutylene terephthalate, a polyester resin other than the PBT resin such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN) or polypropylene terephthalate (PPT), and a resin selected from PBT resins copolymerized with a dicarboxylic acid such as isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, biphenyldicarboxylic acid, cyclohexanedicarboxylic acid, adipic acid, azelaic acid or sebacic acid |