Substituted naphthopyrans

Details Substituted naphthopyrans Substituted naphthopyrans

1995-10-13

1997-07-22

Chan, Nicky

Compositions

Light transmission modifying compositions

Displaying color change

549389, 549362, 549 60, 549 58, 549 20, 548525, 548518, 548455, 548454, 548440, 5483641, 5483114, 546269, 546202, 546201, 546196, 546165, 5462774, 5462827, 5462764, 544375, 544373, 544372, 544370, 544360, 544150, 544145, 524110, 524108, 524104, 524100, 524 99, 524 84, C08K 515, C07D31192, G02B 523

Patent

active

056500980

ABSTRACT:
Described are novel reversible photochromic 2H-naphtho[1,2-b]pyran compounds, examples of which are compounds having certain substituents at the 5 and 6-positions of the naphtho portion of the naphthopyran and at the 2-position of the pyran ring, e.g., 2,2-bis(4-methoxy phenyl)-5-methoxycarbonyl-6-morpholino-2H-naphtho[1,2-b]pyran. 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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