Method for obtaining a stabilized photochromic latex, latex obtained, and application to ophthalmic optics
US6740699B2 · kind B2 · utility
8Cited by
10References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2002 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Jan 11, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to methods for obtaining the photochromic latex comprising the polymerization in aqueous emulsion of an initial polymerizable mixture, comprising one or more monomers polymerizable by free-radical mechanism and one or more photochromic compounds and the addition to the initial polymerizable mixture, during the polymerization of the initial polymerizable mixture or to the final latex of at least one agent for stabilizing the photochromic properties.Such latexes can be used in the production of photochromic films. Such films may be used, for example, on optical lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.