Photochromic spironaphthopyran compounds

Details Photochromic spironaphthopyran compounds Photochromic spironaphthopyran compounds

1994-04-18

1995-03-07

Ivy, C. Warren

Compositions

Light transmission modifying compositions

Displaying color change

252589, 549330, 524110, C07D31192, C07D31196

Patent

active

053955676

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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