Process for high speed coating of substrates
AssigneeExxon Chemical Patents Inc.
InventorBertram H. Gregory
Life of this patent
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Abstract
Substrates are coated by a process which comprises co-extruding onto the substrate, e.g. aluminium foil, a layer of an olefin terpolymer and a layer of polypropylene, the olefin terpolymer being adjacent to the substrate and the polypropylene being adjacent to the olefin terpolymer. The olefin terpolymer is a terpolymer of an olefin, e.g. ethylene, an unsaturated carboxylic acid or anhydride, e.g. acrylic acid, and an unsaturated ester, e.g. methyl acrylate, in which the amount of carboxylic acid or anhydride groups in the terpolymer is at least 3 mole % and the amount of ester groups in the terpolymer is at least 3 mole %.
Claims18
A process for high speed coating a substrate moving at a line speed of over 50 m/min comprising co-extruding onto the substrate a layer of an olefin terpolymer tie resin and a layer of polypropylene by combining the terpolymer and polypropylene layers to form a molten co-extruded web and contacting said molten co-extruded web with said substrate, the olefin terpolymer tie resin being between the substrate and the polypropylene wherein the olefin terpolymer tie resin is a terpolymer of ethylene or propylene, an unsaturated carboxylic acid having 3 to 8 carbon atoms or an anhydride having 4 to 8 carbon atoms and an unsaturated ester;
- provided, the amount of carboxylic acid or anhydride groups in the terpolymer is at least 3 mole % and the amount of ester groups in the terpolymer is at least 3 mole %.
A process for coating a substrate moving at a rate of from about 100 m/min to 400 m/min with polypropylene through an olefin terpolymer tie resin which comprises co-extruding onto the substrate, polypropylene and the olefin terpolymer tie resin between the substrate and polypropylene wherein the tie resin is a terpolymer, having a melt index between 4 and 7 dg/min (190.degree. C.), comprising from 80 to 94 mole % ethylene, 3 to 10 mole % acrylic acid or methacrylic acid, and 3 to 10 mole % vinyl acetate, methyl acrylate, or methyl methacrylate.
Dependencies are inferred from the claim text.