Polyanhydride photochromic coating composition and photochromic articles
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United States of America Patent
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Aug 20, 2002
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N/A
app pub date -
Dec 11, 1998
filing date -
Dec 11, 1998
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Abstract
Described are articles having a polyanhydride photochromic coating. The coatings exhibit a Fischer microhardness of from 50 to 130 Newtons per mm.sup.2 and desirable photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light. Also described are polyanhydride photochromic articles.
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