Patent ID: 6607834
Filing Date: 2003-08-19
Classification: B29C,B29K,B32B,Y10S,Y10T

Abstract:
A biaxially-oriented multilayer film having a core layer comprising a polyolefin film, at least one silicone-fluid-containing polyester layer, and at least one tie layer interposed between the core and polyolefin layers prepared by the steps of:(a) forming a core layer comprising a polypropylene film; (b) monoaxially orienting the core layer in a first direction; (c) coating or laminating a multilayer cap film to at least one side of the monoaxially oriented core layer to provide a multilayer film, said cap film comprising at least one polyester layer and at least a first tie layer with said first tie layer interposed between said polyester layer and said core layer, said first tie layer comprising a polyolefin adhesive, and said polyester layer containing sufficient silicone fluid to impart substantially uniform stretching characteristics thereto; (d) orienting said multilayer film of step (c) in a second direction transverse to said first direction to provide a biaxially-oriented multilayer film; and, (e) thereafter metallizing an outer surface of said multilayer film opposite said polyester layer.