Photochromic naphthopyrans

Details Photochromic naphthopyrans Photochromic naphthopyrans

1993-06-02

1994-11-29

Chan, Nicky

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

549389, 549331, 549 60, 549 58, 549 32, 546269, 524109, 524 99, C07D31192, C07D33306, C08K 515, C08K 534

Patent

active

053691580

ABSTRACT:
Described are novel reversible photochromic naphthopyran compounds substituted at the number eight carbon atom on the naphtho portion of the naphthopyran ring with, for example, a methoxy group. 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 are also described.

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Padwa et al, J. Org. Chem., vol. 40, No. 8, 1975.

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