Patent ID: 6808658
Filing Date: 2004-10-26
Classification: B29C,Y10T

Abstract:
A method of making a textured multilayer optical film, said method comprising the steps of:(a) providing at least a first and a second stream of resin; (b) dividing said first and said second streams into a plurality of layers such that said layers of said first stream is interleaved with said layers of said second stream to yield a composite stream; (c) passing said composite stream through an extrusion die to form a multilayer web in which each layer is generally parallel to the major surface of adjacent layers to define a film plane; (d) casting said multilayer web onto a casting roll; and (e) contacting said multilayer web with a micro-embossing roll to form a cast multilayer film, the contacting step being carried out to provide the cast multilayer film with a textured surface while maintaining layer thickness uniformity in the film plane.