Patent ID: 6372326
Filing Date: 2002-04-16
Classification: B32B,C08L,Y10S,Y10T

Abstract:
A biaxially oriented polyester film to be molded and laminated on a metal sheet,(A) which comprises a copolyester comprising (a) terephthalic acid and isophthalic acid as dicarboxylic acid components, terephthalic acid being contained in an amount of 82 mol % or more and isophthalic acid or a combination of isophthalic acid and other dicarboxylic acid being contained in an amount of 18 mol % or less based on the total of all the dicarboxylic acid components, and (b) ethylene glycol in an amount of 82 to 100 mol % and other diol in an amount of 0 to 18 mol % based on the total of all the diol components as diol components, having (c) a glass transition temperature of 70Â° C. or higher and lower than 78Â° C., (d) a melting point of 210 to 250Â° C., (e) an intrinsic viscosity of 0.50 to 0.80 dl/g, and containing (f) porous particles having an average particle diameter of 0.1 to 2.5 &mgr;m, a pore volume of 0.05 to 2.5 ml/g, a specific surface area of 50 to 600 m2/g and a compressive resistance of 1 to 100 MPa; and (B) which contains agglomerates of the porous particles having a particle diameter of 20 &mgr;m or more at a density of no more than 10/mm2.