Transparent film made from PET and PEN with UV protection, process for producing the film, and use of the film in packaging with extended shelf life

US7238417B2 · kind B2 · utility

Assignee

• Mitsubishi Polyester Film GmbH · US

Inventors

• Holger Kliesch · Ginsheim-Gustavsburg, DE
• Ursula Murschall · Nierstein, DE
• Thorsten Kiehne · Wiesbaden, DE
• Gottfried Hilkert · Saulheim, DE
• Bart Janssens · Wiesbaden, DE

Key dates

• Filing date: Jun 16, 2003
• Grant date: Jul 3, 2007
• Expiry date: Jun 16, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31797
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a polyester film with a thickness of from about 4 to about 23 μm, which comprises, alongside polyethylene terephthalate as main constituent, from about 2 to about 20% by weight of polyethylene naphthalate (based on the weight of the film), and has fewer than 30 pinholes per 100 m2. The invention further relates to a process for producing these films, and to the use of the films in packaging composites.