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US 2011/0253296 A1Published application
Polymer blends for peelable and/or permanent seals
AssigneeE. I. Du Pont de Nemours and Company
InventorsI-Hwa Lee, Karlheinz Hausmann
Life of this patent
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Abstract
Polymer compositions that can be useful as sealants for peelably and/or permanently sealed packages are provided. The polymer compositions comprise at least one ethylene copolymer and at least one propylene polymer. Also provided are packages sealed with the compositions of the invention, and methods of making packages comprising the compositions of the invention.
Claims23
1-24. (canceled)
A process comprising coextruding a polymer and a sealant to produce a multilayer film containing a layer of the sealant to produce a sealant-containing film;
- and optionally applying the sealant-containing film to a second film of oriented polyester or oriented polypropylene to produce a second multilayer film wherein the multi-layer film or the second multilayer film comprises a composition comprising or produced from a thermoplastic polymer blend comprising an ethylene copolymer and a propylene polymer wherein the ethylene copolymer comprises (1) repeat units derived from ethylene and, alkyl acrylate, acrylic acid, methacrylic acid, or combinations of two or more thereof, and optionally carbon monoxide or an epoxy-containing comonomer, (2) a metallocene-catalyzed ethylene polymer comprising repeat units derived from ethylene and a second α-olefin, or (3) combinations of (1) and (2);
- and the propylene polymer comprises repeat units derived from propylene and optionally a comonomer, which is an α olefin including ethylene, butene, or combinations thereof.
Dependencies are inferred from the claim text.