Substrate for an optical disc
US4701770A · kind A · utility
5Cited by
5References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1986 |
| Grant date | Oct 20, 1987 |
| Priority date | — |
| Expiry date | Jun 12, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided an optical disc of high reliability, with the recording film protected from deterioration. The optical disc of this invention is produced by forming a tellurium suboxide film or optomagnetic recording film on a substrate made by injection molding from a polycarbonate resin. The substrate is made from a polycarbonate resin containing a phosphite ester-based antioxidant in a specific low amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.