Biaxially oriented pet film having enhanced mechanical and shrinking properties and method for the production of the same

US6130311A · kind A · utility

Assignee

• Mitsubishi Polyester Film GmbH · US

Inventors

• Rainer Kurz · Taunusstein, DE
• Holger Kliesch · Ginsheim-Gustavsburg, DE
• Cynthia Bennett · Wiesbaden, DE
• Annegrete Bursch · Düsseldorf, DE
• Franz Hora · Kriftel, DE
• Bodo Kuhmann · Runkel, DE
• Ulrich Schaller · Flörsheim, DE

Key dates

• Filing date: Jun 30, 1999
• Grant date: Oct 10, 2000
• Expiry date: Jun 30, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31786
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a biaxially oriented polyester film having one or more layers and a thickness of .ltoreq.10 .mu.m, where the mechanical consolidation coefficient MC, given by the following equation, lies within the ranges given below: PA0 MC here is .gtoreq.-2, preferably >0 and in particular >0.5, particularly preferably .gtoreq.1, and is .ltoreq.50, preferably .ltoreq.30 and particularly preferably <5 ##EQU1## S200.sub.TD is the transverse shrinkage in % at 200.degree. C. after 15 min. PA1 S200MD is the longitudinal shrinkage in % at 200.degree. C. after 15 min. PA1 T2% is the temperature in .degree. C. at which the film elongates by 2% under a constant tension of 5 N/mm.sup.2. PA1 E.sub.TD is the transverse modulus of elasticity (tensile modulus) at room temperature (21.degree. C.) in N/mm.sup.2.