Photochromic compounds

Compositions – Light transmission modifying compositions – Displaying color change

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Details

350354, 544 71, G02B 523, G02B 104, C07D26538

Patent

active

043426689

ABSTRACT:
Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and R.sub.5 is an alkyl of 2 to 10 carbons, and their use in lenses are disclosed.

REFERENCES:
patent: 3562172 (1971-02-01), Ono et al.
patent: 3578602 (1971-05-01), Ono et al.
patent: 4046586 (1977-09-01), Uhlmann et al.
patent: 4215010 (1980-07-01), Hovey et al.

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