Optical material composed of resin having high refractive index
US4973640A · kind A · utility
12Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1989 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Sep 8, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A resin having a low specific gravity, an excellent impact resistance and a high refractive index can be produced by radical polymerization of a polymerizable monomer mixture composed essentially of [I] at least one polymerizable monomer selected from the group consisting of specific polyfunctional (meth)acrylates, [II] at least one polymerizable monomer selected from the group consisting of styrene and alpha-methylstyrene, and [III] at least one polymerizable monomer selected from the group consisting of unsaturated nitriles. This invention provides an optical material composed of said resin, especially, a lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.