Photochromic polyurethane coating and articles having such a coating
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United States of America Patent
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Feb 13, 2001
Grant Date -
N/A
app pub date -
May 22, 1998
filing date -
Feb 21, 1997
priority date (Note) -
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Abstract
Described are photochromic polyurethane 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 improved 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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