Multilayer polyester film for ready meals
AssigneeCryovac, Inc.
InventorRoberto Forloni
Life of this patent
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Abstract
Coextruded, biaxially oriented multilayer films comprising a base layer comprising a polyester having an intrinsic viscosity greater than 0.75 dl/g and a heat-sealable layer directly adhered to said base layer, said heat-sealable layer comprising an amorphous polyester having a melting temperature not higher than the melting temperature of the polyester of the base layer and a thermoplastic resin characterized in that the heat-sealable layer comprises a further polyester resin are described. Also packages comprising a container, a food product and the above coextruded, biaxially oriented multilayer film are described. The packages are particularly suitable for “ready-meals” to be used in conventional oven at high temperatures.
Claims19
A coextruded, biaxially oriented multilayer film comprising
- a base layer comprising a polyester having an intrinsic viscosity measured according to ASTM method D4603-03 greater than 0.75 dl/g and a heat-sealable layer directly adhered to said base layer, said heat-sealable layer comprising
- from about 25% to 70% by weight of an amorphous polyester having a melting temperature not higher than the melting temperature of the polyester of the base layer, wherein said amorphous polyester is derived from an aliphatic diol and a cycloaliphatic diol with one or more dicarboxylic acids,
- from 10% to 20% by weight of a thermoplastic resin, wherein the thermoplastic resin comprises at least one member selected from the group consisting of polyamide, polystyrene, ionomer resin, ethylene/unsaturated carboxylic acid copolymer, ethylene/unsaturated ester copolymer, ethylene/propylene copolymer, and ethylene/cyclic olefin copolymer;
- and
- from 20% to 60% by weight of a further polyester, which is different from the first amorphous polyester, wherein the further polyester resin comprises at least one further polyester resin selected from those derived from one or more aliphatic diols and an aromatic dicarboylic acid and it is characterized by a melting point higher than 240° C.
- the multilayer film having a free shrink of less than 10% at temperature below 140° C. measured according to ASTM D2732.
Dependencies are inferred from the claim text.