Patent ID: 7358007

Claim:
A laminate for sealing an electrolyte or protecting an electrode of a battery, comprising a metal layer, an inert protective layer formed over the surface of the metal layer in contact with said metal layer, wherein the inert protective layer is a reaction product of a chemical reaction of the metal layer surface with a chemical treating liquor containing chromic acid (salt) and phosphoric acid (salt), and a layer of an adhesive resin comprised of polyolefin modified by a grafting reaction with maleic anhydride, formed over the inert protective layer and fusedly bonded with heat thereto, wherein said polyolefin to be modified by the grafting reaction with maleic anhydride being a homopolymer of ethylene or propylene or a copolymer of ethylene or propylene with an α-olefin having two or more carbon atoms or with an ethylenically unsaturated carboxylic acid or a derivative thereof.