Photochromic benzodioxine fused naphthopyran compounds, compositions and articles containing those naphthopyran compounds
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United States of America Patent
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Feb 22, 2005
Grant Date -
Sep 11, 2003
app pub date -
Mar 1, 2002
filing date -
Mar 1, 2002
priority date (Note) -
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Abstract
Benzodioxino-naphtho[1,2-b]pyran compounds having particularly advantageous photochromic properties, such as, high sensitivity/coloration, two distinct absorption bands in the 430-500 nm range and 520-620 nm range of the visible spectrum may be generally described as a naphthopyran having a central nucleus of the formula: ##STR1## wherein F is a 1,4-benzodioxine ring ##STR2## with its 2,3 positions fused to the i, j, or k faces; and R.sub.1 and R.sub.2 are the atoms or groups providing photochromic properties to the naphthopyran.
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