Stretched polycarbonate films filled with carbon black

US4791016A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Bernhard Schulte · Krefeld, DE
• Werner Tischer · Bobingen, DE
• Werner Waldenrath · Cologne, DE
• Hans Kaloff · Neuss, DE

Key dates

• Filing date: Feb 20, 1987
• Grant date: Dec 13, 1988
• Expiry date: Feb 20, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/269
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A polycarbonate film obtained by dispersing carbon black in a solution of thermoplastic aromatic polycarbonate, producing a cast film, and subsequently stretching the cast film, is characterized in that its elongation at break is greater than that of a corresponding unstretched similarly filled film having an identical thickness.