Photochromic compounds

Details Photochromic compounds Photochromic compounds

1994-08-02

1996-05-28

Tucker, Philip

Compositions

Light transmission modifying compositions

Displaying color change

549389, G02B 523, C07D31192

Patent

active

055208533

ABSTRACT:
A naphthopyran compound of general formula (I) ##STR1## wherein R.sub.1 represents an alkyl group or an aryl group; each of R.sub.4 and R.sub.5, which may be the same or different, independently represents an alkyl, alkenyl, carbocyclic or heterocyclic group, or R.sub.4 and R.sub.5 taken together with the carbon atom to which they are attached form a carbocyclic ring or a heterocyclic ring; and

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