Method for tinting a hydrophilic polymer by incorporating a reactive dye into the polymer prior to polymerization
US5151106A · kind A · utility
13Cited by
28References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1990 |
| Grant date | Sep 29, 1992 |
| Priority date | — |
| Expiry date | Dec 21, 2010 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P3/348
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A hydrophilic polymer, e.g., provided as a contact lens, is tinted by a method which incorporates a reactive dye into the polymer during formation of the latter. Following physical entrainment of the reactive dye in the polymer, the polymer is contacted with an aqueous solution of a base which catalyzes the reaction of the dye with the polymer. In this way, the dye becomes permanently covalently bound to the polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.