Stabilizing mixture for compounds having a photochromatic activi

Details Stabilizing mixture for compounds having a photochromatic activi Stabilizing mixture for compounds having a photochromatic activi

1991-09-16

1993-09-07

Stoll, Robert L.

Compositions

Light transmission modifying compositions

Displaying color change

252589, G02B 523, F21V 904

Patent

active

052426246

ABSTRACT:
Stabilizing mixture for photochromatic substances containing a cyclic amine chosen from 1,4-diazabicyclo-(2.2.2)octane and quinuclidine, or their derivatives, and at least one sterically hindered amine.

REFERENCES:
patent: 3844792 (1974-10-01), Zweig et al.
patent: 4720356 (1988-01-01), Chu
patent: 4931221 (1990-06-01), Heller
patent: 4946880 (1990-08-01), Costanzi et al.
patent: 4975474 (1990-12-01), Barsotti et al.

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