. "Any adhesive can be used for the lamination Examples of adhesives applicable include PVA resins (including denatured PVA such as acetoacetyl, sulfonic, carboxyl or oxyalkylen group) and aqueous solutions of boron compounds Of these adhesives, PVA resins are preferable The thickness of the adhesive layer is preferably 001 to 10 ??m and particularly preferably 005 to 5 ??m, on a dried layer basis" . . .