Indolino-spiroquinoxalino oxazine photochromatic compounds, meth

Compositions – Light transmission modifying compositions – Displaying color change

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252600, 544 71, G02B 523, G03C 100, C07D26500

Patent

active

051397072

ABSTRACT:
The new photochromic compounds of the invention have the formula of a indolino-spiro-oxazine comprising an indolinic part and an oxazine part wherein the oxanine part comprises an unsaturated 6-atoms bi-aza heterocycle of the pyrimidine type included in a nucleus of the quinazoline part.
Preferred photochromic compounds are those showing the following developed formula (II) wherein

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