| 摘要 |
<p>A laminate article comprises a paper layer coated with a film forming non-aromatic hydrocarbon olefin polymer, with or without the aid of an adhesion promoting agent, the polymer being coated with a metal layer and the metal layer coated with a film-forming non-aromatic hydrocarbon olefin polymer. The olefin polymer may be a polymer of a mono-olefinic monomer containing from 2 to 8 carbon atoms e.g. ethylene propylene or butylene. The layer of olefin polymer on the metal layer may be transparent. The metal layer may be of tin, aluminium, magnesium, lead, nickel, zinc, gold or silver, and may be less than 0.04 mil thick. An intermediate adhesion promoting layer of a polyalkyleneimine containing alkylene units having from 2 to 4 carbon atoms may be disposed between the paper and olefin polymer layer. The polyalkyleneimine may be polyethyleneimine and may be applied with a gravure roll. The laminate article is made by depositing e.g. by extrusion, a molten layer of the film forming non-aromatic hydrocarbon olefin polymer over the layer of metal and solidifying the olefin polymer on the metal layer. The layer of paper, polyolefin or metal may be subjected to a methane flame or an electrostatic discharge before depositing the olefin polymer over the layer of metal. The molten polyolefin may be passed any distance through the atmosphere from the outlet of the die to the surface to be coated. Advantageously the distance should be not more than 12 inches e.g. 6 to 10 inches. The laminate may be heat sealed and used for packaging foodstuffs, cosmetics, and medicinals.</p> |
