Molding compositions of low double refraction

US5147700A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Horst Bruggemann · Königstein, DE
• Dieter Freitag · Krefeld, DE
• Lothar Meier · Sprockhövel, DE
• Christian Lindner · Bensheim, DE
• Hans-Eberhard Braese · Cologne, DE

Key dates

• Filing date: May 17, 1990
• Grant date: Sep 15, 1992
• Expiry date: May 17, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/3192
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to thermoplastic molding compositions of PVC and (ter)polymers which can optionally be grafted on to a resin and are suitable for the production of optical discs by virtue of their extremely low double refraction.