Two-layer closure, particularly for closing plastic containers

An article of manufacture comprising a container formed of polyethylene or polypropylene having an opening therein, a metal-foil closure heat-sealed to said container across said opening, said closure comprising a metal foil, an adhesive layer bonded to one side of said foil, said adhesive layer being formed of a mixture of two compounds A and B, compound A being a copolymer of an aliphatic monoolefin and of a monoethylenically unsaturated carboxylic acid capable of having good heat-sealed adhesion to the metal foil and to the container, and compound B being a compound which reduces said adhesion of compound A for the container sufficiently that a viable capping seal was formed by heat sealing and yet closure is conveniently peelable from said container.