Patent ID: 6420010
Filing Date: 2002-07-16
Classification: B32B,Y10T

Abstract:
A white laminated polyester film for metallic plate lamination work comprising a layer A composed of a copolyester A, a layer B composed of a copolyester B, and a layer C composed of a copolyester C, wherein the layer A is laminated to one side of the layer B, the layer C is laminated to the other side of the layer B, and(i) copolyester A is a copolyester having a melting point of from 210 to 245Â° C. and an intrinsic viscosity of the polymer part of from 0.46 to 0.66 and containing 0 to 10% by weight of rutile titanium oxide having an average particle diameter of from 0.1 to 0.5 &mgr;m and 0.01 to 0.1% by weight of silicon dioxide particles having an average particle diameter of from 0.6 to 2.0 &mgr;m, (ii) copolyester B is a copolyester having a melting point of from 210 to 245Â° C. and an intrinsic viscosity of the polymer part of from 0.46 to 0.66 and containing 20 to 50% by weight of an inorganic particle consisting of rutile titanium oxide having an average particle diameter of from 0.1 to 0.5 &mgr;m, and (iii) copolyester C is a copolyester having a melting point of from 210 to 245Â° C. and an intrinsic viscosity of the polymer part of from 0.46 to 0.66 and containing 0 to 10% by weight of rutile titanium oxide having an average particle diameter of from 0.1 to 0.5 &mgr;m and 0.01 to 0.1% by weight of silicon dioxide particles having an average particle diameter of from 0.6 to 2.0 &mgr;m, wherein the concentration of rutile titanium oxide in copolyester A is lower than the concentration of rutile titanium oxide in copolyester B and the concentration of rutile titanium oxide in copolyester C is lower than the concentration of rutile titanium oxide in copolyester B.