US 6,656,548 B1Granted

Laminated cook-in film

AssigneeCryovac, Inc.

InventorsScott W. Beckwith, Ram K. Ramesh, Michael J. Rosinski

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Abstract

A laminate comprising first and second polymeric films. One of the films is heat shrinkable and the other of the first and second films is non-heat shrinkable. At least one of the first and second films has an oxygen permeance of no more than about 150 cm3/m2·atm·24 hours at 23° C. and 0% relative humidity. The first film comprises an outer layer which, even when untreated, has a surface energy of at least 0.034 J/m2, and at least about 10 weight percent of one or more polymers having a Vicat softening point of at least about 65° C. The first film outer layer forms a first outer surface of the laminate. The outer layer of the second film forms the second outer surface of the laminate. The laminate has an improved ability to be sealed about a forming shoe without necking down.

Claims21

Dependent claims

A multilayer structure comprising:

a first polymeric film;
a second polymeric film aminated to said first polymeric film made separately from the first polymeric film;
and wherein:
one of the first and second polymeric films is heat shrinkable and the other of the first and second polymeric films is non-heat shrinkable;
at least one of said first and second polymeric films has an oxygen permeance of no more than about 150 cm3/m2·atm·24 hours at 23° C. and 0% relative humidity;
said first polymeric film comprises:
a first polymeric film outer layer which, even when untreated, has a surface energy of at least 0.034 J/m2;
and
at least about 10 weight percent of one or more polymers having a Vicat softening point of at least about 65° C.;
said first polymeric film outer layer forms a first outer surface of said multilayer structure;
and
said second polymeric film comprises a second polymeric film outer layer which forms a second outer surface of said multilayer structure.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/582,517Filed 18 Sep 2000 · us provisional application
Priority: 30 Dec 1997
Granted: 2 Dec 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 7/04
Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between…:…
B65D 2581/34
Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for…: for…
Y10T 428/1324
Hollow or container type article [e.g., tube, vase, etc.]: flexible food casing [e.g., sausage type, etc.]