Compositions – Light transmission modifying compositions – Displaying color change
Patent
1995-03-21
1996-11-12
Chan, Nicky
Compositions
Light transmission modifying compositions
Displaying color change
549389, 549362, 549331, 549 60, 549 58, 548454, 546256, 5462804, 5462811, 5462827, 5462774, 5462824, 524110, G02B 523, G02B 2700, C07D31192
Patent
active
055737129
ABSTRACT:
Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds having certain substituents at the number 5 and 6 carbon atoms of the naphtho portion of the naphthopyran and at the 2-position of the pyran ring. Certain substituents may also be present at the number 7, 8, 9 or 10 carbon atoms of the naphtho portion of the naphthopyran. Also described are organic host materials that contain or that are coated with 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) type compounds, are also described.
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Gemert Barry V.
Knowles David B.
Kumar Anil
Chan Nicky
Mallak Frank P.
Stein Irwin M.
Transitions Optical Inc.
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