Chromene compound

Details Chromene compound Chromene compound

1999-02-22

2000-02-08

Tucker, Philip

Compositions

Light transmission modifying compositions

Displaying color change

351163, G02B 523, G02C 710

Patent

active

060224967

ABSTRACT:
The present invention relates to a novel chromene compound having favorable photochromic properties, developing a color of a high density, exhibiting a small degree of initial color and permitting the color to quickly fade. The novel chromene compound has an amino group that may be substituted for a sixth position of a naphthopiran ring, has electron-donating groups at para-positions of the two phenyl groups bonded to the third position, and has at least one or more electron-attracting groups at meta-positions of the phenyl groups, and is represented, for example, by the following formula, ##STR1##

REFERENCES:
patent: 3567605 (1971-03-01), Becker
patent: 5552090 (1996-09-01), Van Gemert et al.
patent: 5623005 (1997-04-01), Rickwood et al.

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