Use of a transparent polyester film as a gas/flavor barrier film

US6391410B1 · kind B1 · utility

Assignee

• Mitsubishi Polyester Film GmbH · US

Inventors

• Herbert Peiffer · Mainz, DE
• Cynthia Bennett · Wiesbaden, DE
• Guenther Crass · Taunusstein, DE
• Gottfried Hilkert · Saulheim, DE
• Werner Roth · Lenningen, DE

Key dates

• Filing date: Mar 24, 1999
• Grant date: May 21, 2002
• Expiry date: Mar 24, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31786
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The application discloses the use of a transparent, biaxially oriented polyester film having a base layer at least 80% by weight of which is composed of a thermoplastic polyester, and having at least one outer layer, where the outer layer is composed of a polymer or of a mixture of polymers which comprises at least 40% by weight of ethylene 2,6-naphthalate units and up to 60% by weight of ethylene terephthalate units and/or units from cycloaliphatic or aromatic diols and/or dicarboxylic acids, with the proviso that the Tg2 value of the polymer film is above the Tg2 value of the base layer but below the Tg2 value of the outer layer, has a barrier film with respect to the gases H2O, N2, CO2, He and flavors. It is particularly suitable for packaging applications, specifically for packaging foods and other consumable items.