W. R. Grace Co.-Conn.

Cryovac, Inc.

Martindale Nelson

William Peyton Roberts

Marvin Russell Havens

Ronald D Moffitt

George Dean Wofford

Blaine C Childress

Gloria G Toney

John G Bradfute

Lawrence R Norpoth

Cedric M Lulham

C Michael Lulham

Film and sheet materials, and articles made therefrom, such as bags, pouches, trays, etc., comprise one or more layers of homogeneous alpha-olefin/vinyl aromatic copolymer, preferably an ethylene/styrene copolymer. The alpha-olefin/vinyl aromatic copolymer has properties which can provide a desired performance characteristics such as impact resistance, printability, RF sealability, free shrink, optics, high permeability, etc. The homogeneous alpha-olefin/vinyl aromatic copolymer may be present in a monolayer film, either alone or in a blend, or may be included in one or more layers of a multilayer film. Also included is a multilayer thermoformable article comprising a web having a film of such alpha-olefin/vinyl aromatic copolymers thereto.

Film containing alpha-olefin/vinyl aromatic copolymer

The multilayer shrink film of the present invention provides very low shrink tension approximating some PVC films, while providing relatively high free shrink characteristics and relatively low shrink temperatures. The preferred film has three layers including a relatively thick core layer comprising a polymeric material or blend of polymeric materials having a relatively low melting point, typically less than about 100&#xb0; C., two outer layers comprising a polymeric material or blend of polymeric materials having a relatively high melting point, typically greater than about 100&#xb0; C., the material of the outer layers having a melting point at least about 10&#xb0; C. higher than the melting point of the material of the core layer.

Low shrink force shrink film

Film and sheet materials, and articles made therefrom, such as bags, pouches, trays, etc., comprise one or more layers of a thermoplastic, homogeneous alpha-olefin/vinyl aromatic copolymer, preferably an ethylene/styrene copolymer. The alpha-olefin/vinyl aromatic copolymer has properties which can can provide a desired performance characteristics such as impact resistance, printability, RF sealability, free shrink, optics, as well as many others. The homogeneous alpha-olefin/vinyl aromatic copolymer may be present in a monolayer film, either alone or in a blend, or may be included in one or more layers of a multilayer film. Also included is a multilayer thermoformable article comprising a web having a film of such alpha-olefin/vinyl aromatic copolymers therto. Finally, also included is an RF-sealable film comprising such copolymers.

Distortion of a heat shrinkable cook-in package in a hot air cooking medium is substantially reduced or eliminated by the use of a high sustained shrink force cook-in film as the casing for the package.

Food-containing sustained shrink force cook-in film

The multilayer shrink film of the present invention provides very low shrink tension approximating some PVC films, while providing relatively high free shrink characteristics and relatively low shrink temperatures. The preferred film has three layers including a relatively thick core layer comprising a polymeric material or blend of polymeric materials having a relatively low melting point, typically less than about 100.degree. C., two outer layers comprising a polymeric material or blend of polymeric materials having a relatively high melting point, typically greater than about 100.degree. C., the material of the outer layers having a melting point at least about 10.degree. C. higher than the melting point of the material of the core layer.

Growing community of inventors

Greer, SC, United States of America

Martindale Nelson