Patent ID: 6649235
Filing Date: 2003-11-18
Classification: B29C,B29K,B29L,B32B,C08J,Y10S,Y10T

Abstract:
A method for making a coated polymeric article comprising the steps of:(a) co-extruding a selected polyolefin and a maleic anhydride modified polyolefin, thereby producing a polymeric substrate having a first surface of modified maleic anhydride polyolefin and a second surface of polyolefin; (b) orienting the polymeric substrate biaxially prior to surface treatment by stretching the substrate up to 5 times in the machine direction and up to 10 times in the transverse direction; (c) treating the maleic anhydide surface of the polymeric substrate to permit receipt of a polysilicate barrier coating; and (d) applying a polysilicate barrier coating to the surface treated polymeric substrate of (c).