Lidding structure based on aromatic polyester film, coextruded with a sealable/peelable epoxy-containing thermoplastic polymer
AssigneeToray Plastics (America), Inc.
InventorSTEFANOS L. SAKELLARIDES
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Abstract
A multi-layer film structure suitable as sealable sheet specially used for closing foodstuff containers producing a peelable seal. This multi-layer film comprises a polyester substrate layer and a sheat-sealable layer. The heat-sealable layer is applied by coextrusion and comprises as major component a polymer composition comprising residues of epoxy-containing monomers selected from glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, 3,4-epoxy-1-butene, or a mixture of any two or more of such monomers.
Claims20
A film comprising a heat-sealable surface layer and a polyester-containing core layer, wherein the heat-sealable layer comprises greater than 30 wt. % of an epoxy-containing thermoplastic polymer, wherein the film is a coextruded heat-sealable and peelable multilayer thermoplastic film.
A method of making a coextruded heat-sealable and peelable multilayer thermoplastic film comprising coextruding a heat-sealable surface layer and a polyester-containing core layer, wherein the heat-sealable layer comprises greater than 30 wt. % of an epoxy-containing thermoplastic polymer.
Dependencies are inferred from the claim text.