Compositions – Light transmission modifying compositions – Displaying color change
Patent
1994-04-08
1995-09-19
Chan, Nicky
Compositions
Light transmission modifying compositions
Displaying color change
549383, 548423, 548421, 524110, 524 94, G02B 523, C08K 515, C07D40510, C07D40710
Patent
active
054513448
ABSTRACT:
Described are novel reversible photochromic diaryl-3H-naphtho[2,1-b]pyran compounds having a substituted or unsubstituted, five or six member heterocyclic ring fused to the g, i, or l side of the naphthopyran. The heterocyclic ring contains an oxygen or nitrogen atom and is attached to the number 5, 6, 7, 8, 9, or 10 carbon atom of the naphtho portion of the naphthopyran. Also described are organic host materials containing such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline)oxazine-type compounds, are also described.
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Gemert Barry Van
Knowles David B.
Chan Nicky
Mallak Frank P.
Stein Irwin M.
Transitions Optical Inc.
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