Laminated polyester film to be laminated on metal plate

• Main Authors: KOSUGE, MASAHIKO, KURIHARA, HIDESHI
• Format: Patent
• Language: Chinese; English
• Published: 21.01.1999
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING

A laminated polyester film to be laminated on a metal plate, which comprises: (A) a first layer formed of a first aromatic copolyester which (a1) contains terephthalic acid as a main dicarboxylic acid component and ethylene glycol as a main glycol component and which has (a2) a melting point in the range of 210 to 245 DEG C and (a3) a glass transition temperature of at least 60 DEG C, wherein the first aromatic copolyester has an intrinsic viscosity of 0.52 to 1.5 dl/g, and the first aromatic copolyester is produced in the presence of a germanium compound as a polycondensation catalyst, and (B) a second layer formed of a molten blend which comprises 60 to 99% by weight of a second aromatic polyester which (b1) contains ethylene terephthalate as a main recurring unit and which has (b2) a melting point in the range of 210 to 255 DEG C and (b3) a glass transition temperature of at least 60 DEG C and 1 to 40% by weight of a third aromatic polyester which (c1) contains tetramethylene terephthalate as a main recurr