Polyester film having a high oxygen barrier and improved adhesion to metal layers its use and process for its production

US6200511A · kind A · 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: Mar 13, 2001
• 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 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, wherein the outer layer is composed of a copolymer or of a mixture of polymers which comprises at least 35 mol % of ethylene 2,6-naphthalate units, up to 44 mol % of ethylene terephthalate units, and from 1 to 20 mol % of ethylene isophthalate units, and also up to 20 mol % of a sulfo-substituted dicarboxylic acid and, if desired, up to 10 mol % of units from aliphatic, including cycloaliphatic, or aromatic diols and/or dicarboxylic acids (based in each case on the total content of dicarboxylic acid or diol).