PHOTOCHROMIC COMPOUND AND CURABLE COMPOSITION CONTAINING THE PHOTOCHROMIC COMPOUND
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United States of America Patent
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Issued Date -
Aug 3, 2023
app pub date -
Oct 14, 2020
filing date -
Oct 17, 2019
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Abstract
A photochromic compound of the present invention comprises at least two monovalent photochromic basic structure groups PC including a T-type photochromic moiety, the photochromic basic structure groups being bonded to an organic group having a non-SO aromatic ring containing neither a sulfur atom nor an oxygen atom.
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