Transparent, sealable, UV-resistant polyester film, its use and process for its production

US6863954B2 · kind B2 · utility

Assignee

• Mitsubishi Polyester Film GmbH · US

Inventors

• Herbert Peiffer · Mainz, DE
• Guenther Crass · Taunusstein, DE
• Ulrich Kern · Ingelheim am Rhein, DE
• Ursula Murschall · Nierstein, DE
• Andreas Stopp · Ingelheim am Rhein, DE

Key dates

• Filing date: May 5, 2003
• Grant date: Mar 8, 2005
• Expiry date: May 5, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31797
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Biaxially oriented, coextruded polyester films with a base layer at least 90% by weight of which is composed of a thermoplastic polyester, preferably polyethylene terephthalate (PET), and with at least one sealable outer layer and a second nonsealable outer layer and, if desired, with other intermediate layers, and comprising at least one UV absorber, preferably hydroxybenzotriazoles and triazines, have high UV resistance, do not embrittle when exposed to high temperatures, have a surface without undesirable haze and are suitable for numerous indoor and outdoor applications. The outer layers comprise antiblocking agents, such as silica with an average particle diameter preferably below 50 nm and/or above 2 μm, and the sealable outer layer is preferably composed of a copolyester which has been built up from ethylene terephthalate units and ethylene isophthalate units.