Biaxially oriented polypropylene film having improved tear propagation resistance

US6063482A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Herbert Peiffer · Mainz, DE
• Detlef Busch · Saarlouis, DE
• Gunter Schlogl · Kelkheim, DE
• Thomas Dries · Bad Kreuznach, DE
• Andreas Winter · Königstein, DE

Key dates

• Filing date: Oct 30, 1997
• Grant date: May 16, 2000
• Expiry date: Oct 30, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31913
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A biaxially oriented polypropylene film is described. The base ply of the film essentially consists of a polypropylene prepared by means of a metallocene catalyst. This polypropylene is distinguished by a mean isotactic block length of greater than 40, an n-heptane soluble fraction of less than 1% and a ratio of the weight average molecular weight M.sub.w to the number average molecular weight M.sub.n of less than 4.