Patent ID: 6692801
Filing Date: 2004-02-17
Classification: B32B,Y10T

Abstract:
A method for producing a packaging laminate having gas barrier properties, which method comprises applying a solution or dispersion of starch or a starch derivative in a liquid vehicle to a surface of a substrate comprising a paper or paperboard core layer and removing said liquid vehicle to deposit said starch or starch derivative on said surface, and applying a layer of plastic to said starch or starch derivative so as to modify the properties of said starch or starch derivative such that the starch or starch derivative provides a gas barrier property, wherein the surface of the substrate is substantially impervious to said liquid vehicle and the starch or starch derivative provides a gas barrier property of 50 cm3/m2 at 24 h, 1 atm (23Â° C., 50% RH) or better, and wherein the substrate surface has a smoothness of 200 Bendtsen or better.