Use of an antimony-free polyester film for producing film bags and film tubes with high heat resistance

US8668970B2 · kind B2 · utility

Assignee

• Mitsubishi Polyester Film GmbH · US

Inventors

• Holger Kliesch · Ginsheim-Gustavsburg, DE
• Cynthia Bennett · Wiesbaden, DE
• Bodo Kuhmann · Runkel, DE
• Matthias Konrad · Kriftel, DE
• Thomas Hackl · Asperg, DE
• Stefanie Bauer · Straubing, DE

Key dates

• Filing date: Nov 28, 2012
• Grant date: Mar 11, 2014
• Expiry date: Nov 28, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31786
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Film bags or film tubes formed from biaxially oriented film including less than 10 ppm of antimony and having a haze of less than 10% are provided. The films have an ultimate tensile strength of more than 100 N/mm2; have a difference in the ultimate tensile strength in MD and TD of less than 180 N/mm2; have a tensile strain at break of more than 50%; a tensile strain at break of more than 260%; have a yellowness index b* of less than 2.5; have a lightness L*>85; include from 50 to 15 000 ppm of free-radical scavenger; have an SV of at least 600 after ovening; have a tensile strain at break of >5% after ovening; have a film thickness of from 6 to 26 μm; and include more than 90% by weight of polyester.