Photochromic compound, process for production thereof, use there

Details Photochromic compound, process for production thereof, use there Photochromic compound, process for production thereof, use there

1989-06-29

1992-07-14

Stoll, Robert L.

Compositions

Light transmission modifying compositions

Displaying color change

252589, 548407, 549234, 549236, 549239, 549 41, 549 44, 549 45, 549 47, 549 48, 549 42, 430336, 430339, G02B 523, G03C 1725, C07D20700, C07D30777

Patent

active

051300583

ABSTRACT:
A photochromic compound represented by the following general formula [I] ##STR1## wherein ##STR2## represents a divalent aromatic hydrocarbon group or a divalent heterocyclic group each of which may have a substituent,

REFERENCES:
patent: 4685783 (1987-08-01), Heller et al.
patent: 4882438 (1989-11-01), Tanaka et al.

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