Biaxially stretched polypropylene monofilm

US5252389A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Robert Schmidt · Eltville am Rhein, DE
• Peter Eiden · Bad Homburg vor der Höhe, DE
• Gerhard Koch · Nagold, DE
• Karl-Heinz Mueller · Grand Rapids, US

Key dates

• Filing date: Jan 22, 1992
• Grant date: Oct 12, 1993
• Expiry date: Jan 22, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31913
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A biaxially stretched polypropylene monofilm, wherein the surfaces of the two sides of the polypropylene monofilm have different roughnesses R.sub.Z, is employed as an insulation film for the production of capacitors. The smoother of the two surfaces of the polypropylene monofilm is substantially free from fibrils and pits, so that no flaws occur in a metal layer applied on metallization of this surface.