Curable photochromic compositions
US11795331B2 · kind B2 · utility
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24Claims
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Key dates
| Filing date | Feb 17, 2021 |
| Grant date | Oct 24, 2023 |
| Priority date | — |
| Expiry date | Feb 17, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/102
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A curable photochromic composition can include: (a) a first component having a first compound with at least two active hydrogen-functional groups and an active hydrogen-functional group equivalent weight of at least 1000; (b) a second component having at least one of a polyisocyanate and a blocked polyisocyanate; and (c) at least one photochromic compound. The ratio of total isocyanate and blocked isocyanate group equivalents of the second component to total active hydrogen-functional group equivalents is at least 4:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.