Transparent, sealable, flame-retardant polyester film, method for the production and use thereof

US7157132B2 · kind B2 · utility

Assignee

• Mitsubishi Polyester Film GmbH · US

Inventors

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

Key dates

• Filing date: Jan 10, 2001
• Grant date: Jan 2, 2007
• Expiry date: Jan 7, 2022

Classification

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

Abstract

Biaxially oriented, co-extruded polyester films comprising a base layer consisting of at least 90 wt. % thermoplastic polyester, preferably polyethylene terephthalate (PET), at least one sealable outer layer and a second non-sealable outer layer and, optionally, other intermediate layers, in addition to at least one flame-retardant agent, preferably organic phosphorous compounds. The inventive films are characterized by low inflammability, high UV stability, no embrittlement when subjected to thermal stress and a surface which is devoid of troublesome opacity. They are suitable for a multiplicity of uses both indoors and outside. The outer layers contain anti-blocking agents such as silicic acid having an average particle diameter of preferably less than 50 nm and/or 2 μm. Preferably, the sealable outer layer consists of a copolyester which is made of ethylene terephthalate and ethylene isophthalate units.