Photochromic epoxy resin coating composition and articles having such a coating
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United States of America Patent
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Jul 31, 2001
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N/A
app pub date -
Nov 6, 1998
filing date -
Dec 8, 1997
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Abstract
Described are photochromic epoxy resin coatings that meet commercially acceptable 'cosmetic' standards for optical coatings. Also described are articles having such coatings. The coatings exhibit a Fischer microhardness of from 50 to 150 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.
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