Thiourethane-based optical material
US7396900B2 · kind B2 · utility
1Cited by
5References
2Claims
0Family size
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Key dates
| Filing date | Feb 20, 2007 |
| Grant date | Jul 8, 2008 |
| Priority date | — |
| Expiry date | Feb 20, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A composition for making a high-refractive-index resin contains a polythiol compound and a compound containing at least two iso(thio)cyanato groups, the polythiol compound having a dithioacetal, dithioketal, orthotrithioformic ester, or orthotetrathiocarbonic ester skeleton. The molar ratio of the mercapto group to the iso(thio)cyanato group in the composition is greater than 1.0 but not more than 3.0. A method for making a resin by curing the composition, a resin prepared by curing the composition, an optical element made from the resin, and a lens made from the optical element are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.