Indolino-spiro-oxazine photochromic compounds with five-membered

Details Indolino-spiro-oxazine photochromic compounds with five-membered Indolino-spiro-oxazine photochromic compounds with five-membered

1990-06-05

1992-05-19

Stoll, Robert L.

Compositions

Light transmission modifying compositions

Displaying color change

252589, 544 71, G02B 523, F21V 904, C07D26500

Patent

active

051146215

ABSTRACT:
The new photochromic compounds of the invention have the formula of an indolino-spiro-oxazine comprising an indolinic part and an oxazine part, wherein said oxazine part comprises an unsaturated heterocycle with 5 links which comprises one or several atoms selected from nitrogen and sulphur.
Preferably the heterocycle is orthocondensed with a benzenic ring of the oxazine part of the compound, and said heterocycle comprises an imine C.dbd.N-bond. The ozazine part may typically be comprised of a benzothiazol-oxazine group of of an indolino-oxazine group.

REFERENCES:
patent: 4792224 (1988-12-01), Kwiatkowski et al.

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