Multilayer, transparent film made from polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) for producing packaging composites with UV protection

US7285322B2 · kind B2 · utility

Assignee

• Mitsubishi Polyester Film GmbH · US

Inventors

• Holger Kliesch · Ginsheim-Gustavsburg, DE
• Thorsten Kiehne · Wiesbaden, DE
• Bart Janssens · Wiesbaden, DE
• Christine Schmiedeskamp · Wiesbaden, DE

Key dates

• Filing date: Jun 16, 2003
• Grant date: Oct 23, 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 an at least two-layer polyester film with a total thickness of from 5 to 200 μm which comprises, alongside polyethylene terephthalate, from 2 to 20% by weight—based on the weight of the entire film—of polyethylene naphthalate (PEN), where at least one outer layer comprises less than 0.1% by weight of PEN (based on the weight of this outer layer).