Polyisocyanate compounds, process for producing the same, and optical materials using the same
US6313316A · kind A · utility
14Cited by
0References
4Claims
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Assignee
Inventors
Key dates
| Filing date | Jul 14, 1999 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Jul 14, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention provides a novel polyisocyanate compound which is useful as a starting material for an optical material having a high refractive index, a low dispersion and excellent optical characteristics, and a process for producing this compound at good efficiency. The invention also provides an optical material having a high refractive index, a low dispersion, an excellent transparency without optical distortion and having good heat resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.