MULTILAYER THERMOPLASTIC FILMS AND METHODS OF MAKING

摘要

A method of forming a multilayer film is disclosed, comprising coextruding a first layer comprising a weatherable composition, and a second layer comprising a polycarbonate composition comprising a visual effect filler, wherein the first and second layers are formed by flowing each of the weatherable composition and polycarbonate composition through separate flow channels in a multi-manifold coextrasion die. The shear stress during extrusion on the polycarbonate composition is greater than or equal to 40 kilo-Pascals.