Patent ID: 6436544
Filing Date: 2002-08-20
Classification: B32B,C08J,Y10S,Y10T

Abstract:
A composite metallized film stretched biaxially, based on a polyester and having improved barrier properties to gases, characterised in that it comprises a polyester film base of 5 &mgr;m to 50 &mgr;m, directly coated on one of its two faces with a layer including a mixture of a polyvinyl alcohol which has an average degree of polymerisation in number equal to or in excess of 350 and a water-dispersible copolyester with sulphonyloxy residues, the layer including the polyvinyl alcohol and the water-dispersible copolyester being in turn coated with a metal layer, said composite film exhibiting a permeability to oxygen measured at 23Â° C. under a relative humidity of 50% equal to or lesser than 0.4 cm3/m2/24 h.