Method for stabilization of organic base substances against ligh

Details Method for stabilization of organic base substances against ligh Method for stabilization of organic base substances against ligh

1988-09-12

1991-01-01

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Color imaging process

Stabilizing

430551, 8442, 8623, 556150, G03C 732, C07F 1504

Patent

active

049817736

ABSTRACT:
The present invention relates to a method of stabilizing an organic base substance having an absorption mixture in the range of from about 300 nm to about 200 nm, against light, by combining the organic substance and at least one complex of formulae (I), (II) or (III): ##STR1## in which each of R.sup.1 to R.sup.5, R.sup.10 to R.sup.14 and R.sup.17 to R.sup.21, each of which may be the same or different within an individual compound, represents a halogen atom, a hydrogen atom, or an alkyl, aryl, cycloalkyl or heterocyclic group which is bonded to the carbon atom on the benzene ring directly or indirectly via a divalent linking group, and these may be same or different and the adjacent substituents may be bonded together to form a ring;

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