Patent ID: 6086978
Filing Date: 2000-07-11
Classification: B32B,B65D,C08J,Y10S,Y10T

Abstract:
A biaxially oriented polyester film to be laminated onto a metal plate and molded:(A) which comprises a copolyester comprising (a) 2,6-naphthalenedicarboxylic acid in an amount of 80 to 100 mol % and either an aromatic dicarboxylic acid other than 2,6-naphthalenedicarboxylic acid or a combination of the aromatic dicarboxylic acid other than 2,6-naphthalenedicarboxylic acid and an aliphatic dicarboxylic acid in an amount of 20 to 0 mol % based on the total dicarboxylic acid components, and (b) ethylene glycol in an amount of 72 to 99.95 mol %, diethylene glycol in an amount of 0.05 to 8 mol %, and a glycol other than ethylene glycol and diethylene glycol in an amount of 0 to 20 mol % based on the total diol components, and having (c) a melting point of 198 to 268.degree. C.;(B) which has an extraction of 0.5 mg/inch.sup.2 (0.0775 mg/cm.sup.2) or less when subjected to an extraction treatment in ion exchange water at 120.degree. C. for 2 hours; and(C) which has a center line surface roughness (Ra) of the film surface in the range of 4 to 30 nm.