Cycloolefin random copolymer and process for preparing same
US5272235A · kind A · utility
36Cited by
1References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1991 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Mar 6, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/24304
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In accordance with the present invention, there are provided cycloolefin random copolymers composed of ethylene and cycloolefin and containing substantially no polyethylene, and processes for preparing the same. Optical disc substrates prepared from the above-mentioned copolymers are excellent in transparency and also capable of minimizing the occurence of errors in reading of the discs due to quality of the substrates used therefor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.