Oriented multilayer heat sealable packaging film
First Claim
1. An oriented heat sealable multilayer structure, comprising:
- (a) a substrate comprising a polyolefin film having a first surface and a second surface;
(b) a polymeric heat sealable layer on said first surface of said substrate, said heat sealable layer comprising a polymeric material selected from the group consisting of a terpolymer of ethylene containing from about 1 to 8% by weight of ethylene and from about 1 to 8% by weight of butene-1, propylene and butene-1, said terpolymer of ethylene, propylene and butene-1, a random copolymer or ethylene and propylene, and blends thereof;
(c) a primer coating on said second surface of said substrate; and
(d) a water vapor and gas barrier layer on said primer coating, said water vapor and gas barrier layer selected from the group consisting of a polyvinylidene chloride containing at least about 50% by weight of vinylidene chloride monomer and an interpolymer comprising a minor amount of acrylic acid, methacrylic acid or mixtures thereof and a major amount of neutral monomer esters comprising methyl acrylate, ethyl acrylate, methyl methacrylate or mixtures thereof.
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Accused Products
Abstract
An oriented heat sealable multilayer structure. The structure comprises a substrate having a first surface and a second surface, the substrate comprising a polyolefin film; a polymeric heat sealable layer on the first surface of the substrate, the layer comprising a polymeric material selected from the group consisting of a terpolymer of ethylene, propylene and butene-1, a random copolymer of ethylene and propylene, and blends thereof; a primer coating on the second surface of the substrate; and a water vapor and gas barrier layer on the primer coating, the water vapor and gas barrier layer selected from the group consisting of a vinylidene chloride copolymer containing at least about 50% of vinylidene chloride and an interpolymer comprising a minor amount of acrylic acid, methacrylic acid or mixtures thereof and a major amount of neutral monomer esters comprising methyl acrylate, ethyl acrylate, methyl methacrylate or mixtures thereof. A method for producing the heat sealable multilayer film structure is also provided.
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Citations
19 Claims
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1. An oriented heat sealable multilayer structure, comprising:
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(a) a substrate comprising a polyolefin film having a first surface and a second surface; (b) a polymeric heat sealable layer on said first surface of said substrate, said heat sealable layer comprising a polymeric material selected from the group consisting of a terpolymer of ethylene containing from about 1 to 8% by weight of ethylene and from about 1 to 8% by weight of butene-1, propylene and butene-1, said terpolymer of ethylene, propylene and butene-1, a random copolymer or ethylene and propylene, and blends thereof; (c) a primer coating on said second surface of said substrate; and (d) a water vapor and gas barrier layer on said primer coating, said water vapor and gas barrier layer selected from the group consisting of a polyvinylidene chloride containing at least about 50% by weight of vinylidene chloride monomer and an interpolymer comprising a minor amount of acrylic acid, methacrylic acid or mixtures thereof and a major amount of neutral monomer esters comprising methyl acrylate, ethyl acrylate, methyl methacrylate or mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for producing an oriented heat sealable multilayer structure, comprising:
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(a) coextruding a substrate comprising a polyolefin film with a polymeric heat sealable layer the polymeric heat sealable layer comprising a material selected from the group consisting of a terpolymer of ethylene, propylene and butene-1, said terpolymer of ethylene, propylene and butene-1 containing from about 1 to 8% by weight of ethylene and from about 1 to 8% by weight of butene-1 a random copolymer of ethylene and propylene, and blends thereof; (b) biaxially orienting the coextrudate; (c) applying a primer coating on the surface of the polyolefin substrate; and (d) applying a water vapor and gas barrier layer on the primer coating, the water vapor and gas barrier layer selected from the group consisting of a polyvinylidene chloride containing at least about 50% by weight of vinylidene chloride monomer and an interpolymer comprising a minor amount of acrylic acid, methacrylic acid or mixtures thereof and a major amount of neutral monomer esters comprising methyl acrylate, ethyl acrylate, methyl methacrylate or mixtures thereof. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification