Optical urethane resins and plastic lenses comprising the same
US5194559A · kind A · utility
9Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1992 |
| Grant date | Mar 16, 1993 |
| Priority date | — |
| Expiry date | Mar 20, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Optical urethane resins according to the present invention are each obtained by reacting an active hydrogen compound with an isocyanate compound containing as a stabilizer a phenolic compound. Owing to their low yellowness, high light transmittance and optical-strain-free quality, these resins are useful as optical materials for plastic lenses or the like which are required to be colorless, transparent and uniform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.