Photochromic coating exhibiting improved performance
US8110127B2 · kind B2 · utility
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38References
12Claims
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Key dates
| Filing date | Jun 18, 2009 |
| Grant date | Feb 7, 2012 |
| Priority date | — |
| Expiry date | May 15, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A photochromic coating exhibiting improved performance and photochromic lenses made using the coating. The coating has excellent photochromic darkening and fatigue properties. The coating formulation is made from a monomer blend having at least two different types of monomers. A metal salt catalyst is used along with an initiator. An antioxidant is used in combination with a hindered amine light stabilizer. The coating is suitable for use in an in-mold coating process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.