B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 15/08 (2006.01)
Patent
CA 2136746
Abstract Production of a metal-plastic film laminate, the metal- plastic film laminate, and use thereof for manufacturing packaging containers. The present invention relates to a process for producing a metal-plastic film laminate by slot die extrusion of random polypropylene copolymer as a film which, on emerging from the slot die, is cooled by means of chill rolls and laminated onto at least one of the main surfaces of a metal sheet, which comprises quenching the polypropylene copolymer to temperatures between 0°C and 15°C directly on emerging from the slot die of the extruder and, after the plastic film has been laminated to the metal sheet by means of a solvent-containing or aqueous adhesive, cooling the resulting metal-plastic film laminate to temperatures of 0°C to 25°C when the laminating of the film of the metal sheet has taken place at temperatures above the melting point of the polypropylene copolymer of the plastic film, or, after the plastic film has been laminated onto the metal sheet by means of a coextruded adhesion promoter, cooling the resulting metal-plastic film laminate to temperatures of 0°C to 25°C. The present invention further relates to the metal-film laminate produced by the process of the invention and to its use for manufacturing packaging containers.
Fetherstonhaugh & Co.
Ppg Industries Inc.
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