Molding material
US5143979A · kind A · utility
5Cited by
0References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1990 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | Jun 20, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/263
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A molding material suitable as an optical material and an optical recording medium formed of the molding material are disclosed. The molding material comprises a hydrogenated product of a polymer formed by ring-opening polymerization of a norbornene-type monomer, the hydrogenated product having a number average molecular weight (Mn) of 20,000 to 50,000, a weight average molecular weight (Mw) of 40,000 to 80,000 and a molecular distribution (Mw/Mn) of not more than 2.5 and having a volatile content of not more than 0.3% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.