Patent ID: 6106933
Filing Date: 2000-08-22
Classification: B32B,C23C,Y10T

Abstract:
A transparent gas barrier biaxially oriented polypropylene film, comprising:1) a base layer comprising a polypropylene polymer2) a polyolefin resin layer of 30 to 85 J/g in the heat of fusion formed at least on one side of the base layer, and3) an imperfectly oxidized alumina layer formed on the polyolefin resin layer, wherein the aluminum metal concentration in the internal portion of the imperfectly oxidized alumina layer is higher than that in the surface of the layer and that in the interface with the polyolefin resin layer, and the aluminum metal content in the imperfectly oxidized alumina layer is kept in a range of 10 to 200% nm.