Patent · US Expired

Moulding compositions of low double refraction

US5143973A · kind A · utility

0Cited by

4References

4Claims

0Family size

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	Apr 23, 1990
Grant date	Sep 1, 1992
Priority date	—
Expiry date	Apr 23, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/3192
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.