Process for production of optical material
US6444146B2 · kind B2 · utility
20Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2001 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Feb 22, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved process for producing optical materials with minimized yellowing is described. The process is characterized by polymerizing/curing a composition for optical materials after adding a bluing agent. With the use of the bluing agent, the yellowing is minimized even when a large amount of an ultraviolet light absorber is used to improve a light resistance of the resultant optical material, thereby enabling the production of optical materials having a colorless and transparent appearance and excellent optical properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.