Patent · US Active

Substrate material for high speed optical discs

US8436128B2 · kind B2 · utility

0Cited by

6References

9Claims

0Family size

Assignee

Bayer Intellectual Property GmbH · DE

Inventors

Friedrich-Karl Bruder · Krefeld, DE
Wilfried Haese · Rheydt, DE
Rafael Oser · Krefeld, DE
Ulrich Blaschke · Krefeld, DE
Raymond Wong · Norman, US
Ice Zhang · Shanghai, CN
Jörg Wehrle · Remagen, DE
Michael Roppel · Burscheid, DE

Key dates

Filing date	Dec 12, 2009
Grant date	May 7, 2013
Priority date	—
Expiry date	Dec 12, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG11B7/2534
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

This invention relates to the use of polycarbonate for the production of an optical recording medium in which secure high speed operation, a transcriptability of the pit/groove structure of >85% and sufficient disc flatness can be achieved and the polycarbonate is based on bisphenol A and the polycarbonate contains a release agent in an amount less than 2000 ppm.

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