Patent ID: 6878442
Filing Date: 2005-04-12
Classification: B32B,B65D,Y10T

Abstract:
1. A polyester film comprising: a surface layer layer A and an adhesive layer B in a two layer structure, wherein, the layer A comprises a polyester mixture of a polyester containing a terephthalic acid-ethylene glycol component and a polyester containing a terephthalic acid-butanediol component, wherein the polyester mixture has a melting point of 240° C.-260° C.; and the layer B comprises a polyester having a melting point of 200° C.-235° C., wherein the polyester film has a coefficient of kinetic friction at the surface of the layer A of not more than 0.45 at 80° C. when the film is thermally adhered on the layer B side of the film to a metal plate comprising a tin free steel to provide a laminate, an ethylene terephthalic cyclic trimer content of not more than 0.70 wt %, and a change in length or width of not more than 2.0% when the film is thermally adhered on the layer B side of the film to the metal plate comprising a tin free steel to provide a laminate and then heat-treated at 210° C. for 2 minutes.