Patent ID: 6645589
Filing Date: 2003-11-11
Classification: B32B,B65D,Y10S,Y10T

Abstract:
A white biaxially oriented polyester film comprising a layer A and a layer B in a two-layer structure, wherein (a) the layer A comprises a polyester mixture comprising a polyester containing a terephthalic acid-ethylene glycol component and a polyester containing a terephthalate acid-butanediol component, wherein the polyester mixture has a melting point of 240Â° C.-260Â° C. and comprises titanium dioxide in a proportion of 5-30 wt %, (b) the layer B comprises a polyester having a melting point of 210Â° C.-235Â° C. and does not comprise titanium dioxide, and (c) the film shows a dimensional change of not more than 2% when the film is thermally adhered on the layer B side of the film to a metal plate to provide a laminate is and then heat-treated at 210Â° C. for 2 minutes.