Photochromic compositions of improved fatigue resistance
US5391327A · kind A · utility
150Cited by
11References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1994 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Jun 9, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Photochromic optical articles of improved resistance to light fatigue are provided by the use of a combination of hindered amine light stabilizer and asymmetric diaryloxalamide light stabilizer with a mixture of (1) photochromic material having a minima luminous transmission in the range of 560 to 630 nanometers and (2) photochromic material having a minima luminous transmission in the range of 430 to 520 nanometers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.