Temperature stable and sunlight protected photochromic articles
US5330686A · kind A · utility
18Cited by
12References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1992 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Aug 19, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/357
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described is a photochromic composition which is a polymerizate of acrylate monomer(s), a crosslinking amount of anhydrous acrylic anhydride and/or anhydrous methacrylate anhydride and a photochromic amount of pyrido benzoxazine. Depending on the amount of crosslinking agents and the other components selected to form the polymerizate, the polymerizate will exhibit improved temperature stability with regard to photocolorability and/or prevention of activation in sunlight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.