Stabilized matrix for photochromic articles
US6083427A · kind A · utility
9Cited by
4References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 13, 1999 |
| Grant date | Jul 4, 2000 |
| Priority date | — |
| Expiry date | Jan 13, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31551
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A stabilizing matrix for photochromic compounds is disclosed in which a functionalized hindered amine light stabilizer capable of reacting with an isocyanate group is linked to the polymer backbone by a covalent bond to form a grafted structure. The resulting matrix is characterized by having a stabilizing effect on the photochromic dye, in particular, spirooxazines. Preferred specific articles of the invention are photochromic organic lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.