Patent ID: 6780482
Filing Date: 2004-08-24
Classification: B32B,C08L,Y10T

Abstract:
A polyester film for metal sheet laminating, the polyester film comprising a blend of a polyester (I) consisting of polybutylene terephthalate or consisting essentially of polybutylene terephthalate and a polyester (II) consisting of polyethylene terephthalate or consisting essentially of polyethylene terephthalate, the polyester (I) being present in the film in a proportion of 80 to 40 wt %, the polyester (II) being present in the film in a proportion of 20 to 60 wt %, the polyester (I) having a melting point of 200 to 223Â° C., the polyester (II) having a melting point of 230 to 256Â° C., the film entirely having an intrinsic viscosity of not lower than 0.75, the film having a heat-up crystallization peak temperature of 60 to 100Â° C. at which a transition from an amorphous phase occurs, and a heat-up crystallization index of not smaller than 0 J/gâ€¢Â° C. in a temperature range of 60 to 100Â° C.