Cryovac, Inc.

Bryan Freeman

Michael Broadus

Nathanael Rustia Miranda

Richard M Dayrit

Frank M Hofmeister

Sumita Sanjeevi Ranganathan

Brian P Rivers

Randall Brush

Kevin McCormick

Donny Kay

Roger D Vrooman

Christopher K Robinson

J Douglas Wilson

Marvin Russell Havens

Matthew D Dawe

Robert W Campbell

Emmet Austin

Josh E Johnston

George D Bolden

Randall L Brush

Kevin L Mccormick

Donny S Kay

Michael E Broadus

J Doug Wilson

Doug Wilson J

Sumita S Ranganathan

A first multilayer shrink film has an outer polyester layer, an inner O-barrier layer, and a tie layer between the polyester layer and the barrier layer. A second multilayer film an outer polyester layer, an inner polyamide layer, and a tie layer between the polyester and polyamide layers. The tie layer comprises a styrene-based polymer, and the tie layer in the second film comprises an anhydride functional styrene based copolymer. Included are a packaging article comprising the film, a packaging process utilizing the film, a process for making the film, and a packaged product comprising a packaging article made the film, with a product inside the package.

Delamination-resistant heat-shrinkable multilayer oxygen barrier film containing polyester

A first multilayer shrink film has an outer polyester layer, an inner 02-barrier layer, and a tie layer between the polyester layer and the barrier layer. A second multilayer film an outer polyester layer, an inner polyamide layer, and a tie layer between the polyester and polyamide layers. The tie layer comprises a styrene-based polymer, and the tie layer in the second film comprises an anhydride functional styrene based copolymer. Included are a packaging article comprising the film, a packaging process utilizing the film, a process for making the film, and a packaged product comprising a packaging article made the film, with a product inside the package.

As a first aspect, the present invention is directed to a process for making a heat-shrinkable annular film, comprising: (A) extruding an annular extrudate downward from an annular die; (B) quenching the annular extrudate by applying a quenching liquid to the annular extrudate; (C) reheating the extrudate to an orientation temperature of from 130&#xb0; F. to 210&#xb0; F., resulting in a reheated annular extrudate; and (D) orienting the reheated annular extrudate while the reheated annular extrudate is in the solid state, the orientation being carried out with a total orientation factor of at least 2, so that the resulting oriented, heat-shrinkable film has a total free shrink at 185&#xb0; F. of at least 10 percent. The extrudate comprises at least one semi-crystalline polyamide selected from the group consisting of: (i) polyamide 6, (ii) polyamide 66, (iii) polyamide 6/66, and (iv) polyamide 6/12. The semi-crystalline polyamide makes up at least 5 volume percent of the annular extrudate. At least 50% of the quenching liquid cascades down the annular extrudate for a distance of at least 2 inches. The quenching liquid makes initial contact with the annular extrudate within 0.1 to 8 inches of the annular die.

Process for making shrink film comprising rapidly-quenched semi-crystalline polyamide

A multilayer, heat-shrinkable film contains at least one semi-crystalline polyamide selected from the group consisting of polyamide 6, polyamide 66, polyamide 6/66, and polyamide 6/12. The film may have a total semi-crystalline polyamide content of at least 35 volume percent, based on total film volume, and a total free shrink at 185&#xb0; F. of at least 35 percent. The film may have an FTIR Transmission Absorbance A/Aratio of up to 1.65. The film may be a retortable film, capable of being used in a process for preparing a retorted packaged product. A process for making a heat-shrinkable annular film containing the semi-crystalline polyamide comprises extruding an annular extrudate downward from an annular die, quenching the annular extrudate by applying a quenching liquid to the annular extrudate, reheating the extrudate to an orientation temperature, and orienting the reheated annular extrudate while the reheated annular extrudate is in the solid state, the orientation being carried out with a total orientation factor of at least 2, to produce a film having a total free shrink at 185&#xb0; F. of at least 10 percent.

Shrink film containing semi-crystalline polyamide and process for making same

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Enoree, SC, United States of America

Bryan Freeman