Process for producing substrate for optical recording medium
US4571314A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1984 |
| Grant date | Feb 18, 1986 |
| Priority date | — |
| Expiry date | Oct 23, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31515
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process for producing a substrate for optical recording medium (optical disk recording medium), which comprises coating at least one inner surface of a casting mold with a radiation-curable or thermosetting resin, curing the resin to form a coating film on the mold surface or surfaces, casting into the mold an epoxy resin composition comprising an alicyclic epoxy resin or a mixture of an alicyclic epoxy resin and an aromatic epoxy resin, an organic polybasic acid anhydride, a curing accelerator and an anti-discoloring (anti-oxidative) agent, curing the epoxy resin composition to transfer the coating film of the mold to the surface of the cured product of the epoxy resin composition, thereby forming a double or triple layer cast laminate. The above casting mold may have a mold-releasing film on the inner surfaces and the coating film may be formed on this mold-releasing film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.