Peel resistant coextruded sheet
AssigneeComposite Container Corporation
InventorLaszlo J. Bonis
Life of this patent
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Abstract
A coextruded thermoplastic sheet, with high peel strength and suitable for thermoforming into a container, the sheet including a layer of acrylonitrile-methyl acrylate copolymer to act as a gas barrier and provide rigidity, thermoformability and printability, a structural layer of polyolefin to provide a moisture barrier and chemical resistance, and an intermediate tie layer of a radial butadiene/styrene teleblock copolymer to provide a strong bond between the acrylonitrile-methyl acrylate copolymer and polyolefin notwithstanding the differences in tendencies to shrink between the two materials.
Claims11
A coextruded sheet comprising
- a layer made of acrylonitrile-methyl acrylate copolymer to provide a gas barrier, rigidity, thermoformability, and printability,
- a structural layer made of polyolefin to provide a moisture barrier and chemical resistance, and
- an intermediate tie layer made of a radial butadiene/styrene teleblock copolymer having between 60 and 80% butadiene and between 20 and 40% styrene,
- whereby said tie layer provides a strong bond between said acrylonitrile methyl-acrylate layer and said polyolefin layer notwithstanding the difference in shrinkage between said acrylonitrile methyl-acrylate layer and said polyolefin layer.
A container thermoformed from a coextruded sheet, said container comprising
- a layer made of acrylonitrile-methyl acrylate copolymer to provide a gas barrier, rigidity, thermoformability, and printability,
- a structural layer made of polyolefin to provide a moisture barrier and chemical resistance, and
- an intermediate tie layer made of a radial butadiene/styrene teleblock copolymer having between 60 and 80% butadiene and between 20 and 40% styrene
- whereby said tie layer provides a strong bond between said acrylonitrile methyl-acrylate layer and said polyolefin layer notwithstanding the difference in shrinkage between said acrylonitrile methyl-acrylate layer and said polyolefin layer.
Dependencies are inferred from the claim text.