Polyester raw material, and film produced therefrom

US5612138A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Rainer Kurz · Taunusstein, DE
• Andreas Ferdinand · Wiesbaden, DE
• Hermann Dallmann · Wiesbaden, DE

Key dates

• Filing date: May 9, 1995
• Grant date: Mar 18, 1997
• Expiry date: May 9, 2015

Classification

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

Abstract

The invention describes a novel polyester raw material and the production and use of an oriented, single- or multilayer film having an overall thickness of .ltoreq.4 .mu.m and a roughness on at least one film surface of R.sub.a <30 nm, where the surface gas-flow resistance on at least one film surface is EQU t.ltoreq.a.multidot.d.sup.b [sec], where a=0 to 10,000 [sec/.mu.m], b=3.0 to .sigma., and d (overall film thickness) .ltoreq.4 .mu.m. The film contains first (I) and second (II) particles. The first particles are monodisperse and have an aspect ratio of 1.0-1.2.