Curable photochromic compositions
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United States of America Patent
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Oct 24, 2023
Grant Date -
Jun 3, 2021
app pub date -
Feb 17, 2021
filing date -
Aug 17, 2015
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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.
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