Photochromic spironaphthopyran compounds
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United States of America Patent
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Mar 7, 1995
Grant Date -
N/A
app pub date -
Apr 18, 1994
filing date -
Apr 18, 1994
priority date (Note) -
Expired
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Abstract
A novel photochromic spironaphthopyran composition having the general structural formula: ##STR1## in which phenyl substituents positioned adjacent to the oxygen of the pyran ring are linked at their adjacent ortho positions by the functionality (R).sub.n wherein n is the integer 0-2 and wherein R is methylene (--CH.sub.2 --), vinylene (--C.dbd.C--), or a carbon-carbon bond, i.e., when n is 0. The groups R.sub.1 and R.sub.5 -R.sub.10 may be hydrogen or a variety of substituents.
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