Organic compounds -- part of the class 532-570 series – Organic compounds – Chalcogen in the nitrogen containing substituent
Patent
1992-12-21
1995-04-11
Shah, Mukund J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Chalcogen in the nitrogen containing substituent
359647, 351162, 351163, 523106, 523135, 524 90, 524 97, G02B 2700, C07D26500, C07D29500
Patent
active
054059585
ABSTRACT:
Described are novel reversible photochromic spiro(indoline) naphthoxazine compounds of improved photocolorability that may be graphically represented by the formula, ##STR1## In preferred embodiments, R.sub.1 is allyl, alkoxyalkyl, and alkyl; each R.sub.2 is alkyl or alkoxy; R.sub.3 and R.sub.4 are alkyl; R.sub.5 is alkoxycarbonyl; and R.sub.6 is hydroxy, alkoxy, or carboxy, e.g., acetoxy. 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 naphthoxazine compounds or combination thereof with complementary photochromic compounds, e.g., naphthopyran or benzopyran compounds, are also described.
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Grumbling Matthew V.
Shah Mukund J.
Stein Irwin M.
Transitions Optical Inc.
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