Patent ID: 6602585
Filing Date: 2003-08-05
Classification: B29C,B32B,B44F,Y10T

Abstract:
An oriented multilayer co-extruded iridescent film having a thickness of about 12 to 150 &mgr;m, said film comprising at least 10 very thin layers of substantially uniform thickness of about 30-500 nm each, said layers being generally parallel and the contiguous adjacent layers being of different heat shrinkable thermoplastic resinous materials, each of said thermoplastic resinous materials being heat shrinkable in at least one dimension in the plane of the film in an amount of at least 10% in response to applied heat in the range of about 70-300Â° C., and wherein the co-extruded contiguous adjacent layers of different heat shrinkable thermoplastic resinous materials are substantially uniformly shrinkable in response to the applied heat in said range and have refractive indexes which differ by at least about 0.03 after said shrinkage and result in iridescence.