Compositions – Light transmission modifying compositions – Displaying color change
Patent
1995-06-14
1997-08-19
Chan, Nicky
Compositions
Light transmission modifying compositions
Displaying color change
549389, 549331, 549 60, 549 58, 548525, 548454, 5483644, 5483114, 546196, 546164, 544375, 544150, 524110, 524109, 524 90, 524 84, C08K 515, C07D31178, C07D40502, G02B 523
Patent
active
056585012
ABSTRACT:
Described are novel reversible photochromic 2H-naphtho[1,2-b] pyran compounds, examples of which are compounds having certain substituents at the number 5 carbon atom 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 6, 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 Van
Knowles David B.
Kumar Anil
Chan Nicky
Mallak Frank P.
Stein Irwin M.
Transitions Optical Inc.
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