Process for producing colored contact lens
US4494954A · kind A · utility
21Cited by
6References
24Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 15, 1982 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Dec 15, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/043
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A uniformly colored shaped article which is resistant to discoloration and fading can be produced by immersing a shaped article, particularly a contact lens, consisting of a polymer of at least one monomer selected from the group consisting of acrylates and methacrylates in a dyeing solution prepared by dissolving a water-soluble dye in a solvent capable of swelling said polymer, to swell and color the shaped article, and then drying the swollen shaped article.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.