Photochromic ophthalmic lens
US6065836A · kind A · utility
37Cited by
8References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1998 |
| Grant date | May 23, 2000 |
| Priority date | — |
| Expiry date | Jul 30, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L69/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A photochromic ophthalmic lens and a process for its preparation are disclosed. The lens comprise a substantially transparent substrate having a lenticular shape and, at least one film adhering to at least one surface of said substrate. The film contains a resinous blend of polycarbonate resin, and poycaprolactone and an effective amount of a photochromic dye selected from a group consisting of spiropyrans, spiroxazines, fulgides and fulgimides. In an additional embodiment the film contains a copoly(carbonate-lactone) block or random copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.