Photochromic spiropyran compounds

Details Photochromic spiropyran compounds Photochromic spiropyran compounds

1988-12-30

1990-06-05

Thexton, Matthew A.

Compositions

Light transmission modifying compositions

Displaying color change

252589, 549381, 549390, 549389, 549408, 549406, 351163, 350354, G02B 523

Patent

active

049312219

ABSTRACT:
Described are a series of novel photochromic benzopyran and naphthopyran compounds in which two cyclopropyl groups are appended at the 2-position of the benzopyran or naphthopyran ring. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic or plano lenses that incorporate the noval pyran compounds or combinations of the novel pyran compounds with other complementary photochromic compounds are described. ##STR1##

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patent: 4563458 (1986-01-01), Widdig et al.
patent: 4637698 (1987-01-01), Kwak et al.
Padwa et al, J. Org. Chem., vol. 40, No. 8, 1975, p. 1142.

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