Compositions – Light transmission modifying compositions – Displaying color change
Patent
1994-12-20
1996-09-03
Chan, Nicky
Compositions
Light transmission modifying compositions
Displaying color change
549389, 548962, 548950, 548525, 548454, 546201, 546196, 546167, 5462774, 544315, 544150, 544127, 540524, 524106, 524105, 524104, 524100, G02B 523, G02B 2700, C07D40510, C07D41310
Patent
active
055520901
ABSTRACT:
Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds substituted at the 3 position of the pyran ring with (i) an aryl substituent and (ii) a phenyl substituent having a 5- or 6-member heterocyclic ring fused at the number 3 and 4 carbon atoms of the phenyl substituent, and at the 6 position of the naphthyl portion of the naphthopyran compound with a nitrogen-containing heterocyclic ring. 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.
Chan Nicky
Mallak Frank P.
PPG Industries Inc.
Stein Irwin M.
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