Photochromatic composition and photochromatic articles which con

Details Photochromatic composition and photochromatic articles which con Photochromatic composition and photochromatic articles which con

1991-02-04

1993-01-19

Stoll, Robert L.

Compositions

Light transmission modifying compositions

Displaying color change

252589, G02B 523, F21V 904

Patent

active

051805243

ABSTRACT:
A photochromatic composition contains at least two photochromatic compounds, defined by the general formula: ##STR1## wherein the various substituents from R.sub.1 to R.sub.7 and X are as defined in the specification.
In such a mixture, at least one photochromatic compound is defined by the general formula, wherein R.sub.7 represents a hydrogen atom, and at least one further compound is also defined by the general formula, wherein R.sub.7 represents an -NR.sub.8 R.sub.9, with R.sub.8 and R.sub.9 having the meaning as defined in the text.

REFERENCES:
patent: 4342668 (1982-08-01), Hovey et al.

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