Irradiated multilayer film for primal meat packaging

Patent 4714638 Issued on December 22, 1987. Estimated Expiration Date:

June 14, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2233442

Method for preparing a film of vinylidene chloride polymer
Patent #: 4112181
Issued on: 09/05/1978
Inventor: Baird, Jr. , et al.

Composition comprising a blend of EVA polymers having differing VA contents; films and laminates made therefrom by extrusion; and heat-sealed food bags made from the laminates
Patent #: 4247584
Issued on: 01/27/1981
Inventor: Widiger , et al.

Ethylene-vinyl acetate copolymer film laminate
Patent #: 4278738
Issued on: 07/14/1981
Inventor: Brax , et al.

Sealing cross-linked thermoplastic materials
Patent #: 4318763
Issued on: 03/09/1982
Inventor: Bieler , et al.

Method of making a thermoplastic receptacle having improved high temperature seal
Patent #: 4352702
Issued on: 10/05/1982
Inventor: Bornstein

Method of making composite polyolefin based containers
Patent #: 4426347
Issued on: 01/17/1984
Inventor: Cornell , et al.

Food package of plastic laminate
Patent #: 4442158
Issued on: 04/10/1984
Inventor: Distler

Oriented multilayer heat sealable packaging film
Patent #: 4447494
Issued on: 05/08/1984
Inventor: Wagner, Jr. , et al.

Pasteurizable and cook-in shrink bag constructed of a multilayer film
Patent #: 4448792
Issued on: 05/15/1984
Inventor: Schirmer

More ...

Inventors

Assignee

Viskase Corporation

Application

No. 06/744680 filed on 06/14/1985

US Classes:

428/34.9, Shrinkable or shrunk (e.g., due to heat, solvent, volatile agent, restraint removal, etc.)426/127, Three or more layered packaging materials428/216, No layer or component greater than 5 mils thick428/349, Synthetic resin or polymer428/518, Next to vinyl or vinylidene chloride polymer428/520Ester, halide or nitrile of addition polymer

Examiners

Primary: Buffalow, Edith

Attorney, Agent or Firm

LeFever; John C.

International Classes

B32B 27/16 (20060101)
B65D 30/08 (20060101)

Abstract

A heat-shrinkable, multilayer film suitable for use in fabricating bags for packaging primal and sub-primal meat cuts and processed meats. The multilayer film has a first outer layer of an ethylene-vinyl acetate copolymer, a core layer of a barrier film comprising vinylidene chloride-methyl acrylate copolymer, and a second outer layer of an ethylene-vinyl acetate copolymer. The multilayer film is preferably made by co-extrusion of the layers, and then it is biaxially stretched. After biaxial stretching, the multilayer film is irradiated to a dosage level of between 1 megarad and 5 megarads and heat-sealed in the form of a bag. The bag has improved storage stability characteristics.