Optical material
US4975223A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Feb 3, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An optical material of a high refractive index is formed of a copolymer obtained by copolymerizing 3-40 wt. % of 4-isopropenylbiphenyl, 30-97 wt. % of a monofunctional aromatic monomer represented by the following formula (I) or (II) and 0-67 wt. % of another monomer copolymerizable with 4-isopropenylbiphenyl and the monofunctional aromatic monomer. ##STR1## wherein R means a hydrogen atom or methyl group, X denotes ##STR2## in which n stands for an integer of 0-3, Y is a halogen atom other than a fluorine atom, or a methyl, hydroxyl or methoxy group, and m stands for an integer of 0-3, with the proviso that Y may be different from each other when m is 2 or 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.