Biaxially oriented polyester film

Patent name Biaxially oriented polyester film Patent applicant Toray Co., Ltd. Principal applicant Address Inventor of Tokyo Metropolitan Tanaka Yuji; Tanaka Bunji; Matsui Ryosuke application (patent) No. 03821534.9 Date of application 2003.09.10 Award date Approval notice No. 1681653 Auditing Notice Day 2005.10.12 Instruction CD-ROM D0541 Main classification number B32B27/36 Classification number B32B27/36 Division Original application number Priority item 2002.9.10 JP 263755/2002 Abstract The present invention provides a biaxially oriented polyester film, The main feature is that the main melting point of the polyester is 245-265°C, the bag-breaking strength index at 0°C is 2.0 or more, and the film's longitudinal breaking strength at 120°C is 100 MPa or more. It is excellent in heat resistance, mechanical strength, impact resistance, and flexibility, and is particularly useful as a packaging material. Sovereignty item 1. A biaxially oriented polyester film characterized by a polyester having a main melting point of 245 to 265°C as a main component and a bagging strength index at 0°C of 2.0 or more at 120°C. The film has a longitudinal rupture strength of 100 MPa or more. International Application PCT/JP2003/011541 2003.9.10 International Publication WO2004/024446 Date 2004.3.25 Date of Entry into the Country Patent Agency Beijing Zhong Zhong Law Firm Office Address Agent Duan Chengen; Tian Xin