Stabilized leuco phenazine dyes and their use in an imaging syst

Details Stabilized leuco phenazine dyes and their use in an imaging syst Stabilized leuco phenazine dyes and their use in an imaging syst

1988-02-08

1989-12-26

Berch, Mark L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

430338, C07D24146, B41M 526, B41M 512, C09B 1702

Patent

active

048899321

ABSTRACT:
3,7-Diamino phenazine leuco dyes stabilized in the 10-position with acyl substituents, said acyl substituents being themselves substituted with electron withdrawing groups. The structure of the reduced form of the dye can be represented by the general formula: ##STR1## wherein R.sup.1 represents a member selected from the group consisting of aryl groups having up to 14 carbon atoms and containing from 1 to 5 electrons withdrawing substituents, alkyl groups having up to 4 carbon atoms and containing one or more electron withdrawing groups, certain electron withdrawing groups containing a ##STR2## moiety, and certain electron withdrawing groups containing a --NH-- moiety. These dyes are suitable for use in thermographic imaging systems wherein the leuco dye is in a composition containing a nitrate salt.

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Miller et al, Chem. Abs. 105, 105822j (5-14-86).
Search Report for European Patent Application 85306998.7.

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