Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1979-01-31
1980-05-13
Randolph, John D.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07D20986, B41M 516
Patent
active
042028205
ABSTRACT:
The present invention provides a pressure- or heat-sensitive recording material which contains in its color forming system at least one carbazolylmethane compound of the formula ##STR1## wherein Y is an amino-substituted phenyl radical of the formula ##STR2## or an indolyl radical of the formula ##STR3## in which formulae each of X.sub.1 and X.sub.2 is hydrogen, alkyl of at most 12 carbon atoms which is unsubstituted or substituted, cycloalkyl, phenyl, benzyl, substituted phenyl or substituted benzyl, or X.sub.1 and X.sub.2 together with the nitrogen atom to which they are attached represent a 5- or 6-membered, heterocyclic radical, X.sub.3 is hydrogen, halogen, nitro, lower alkyl or lower alkoxy, each of R.sub.1 and Z.sub.1 is hydrogen, alkyl of not more than 12 carbon atoms which is unsubstituted or substituted; acyl of 1 to 12 carbon atoms, phenyl, benzyl, substituted phenyl or substituted benzyl, and Z.sub.2 is hydrogen, lower alkyl or phenyl, and the rings A, B and D independently can be further substituted. This material yields copies of improved color intensity and lightfastness.
REFERENCES:
patent: 2981738 (1961-04-01), Kranz
Almaula Prabodh I.
Ciba-Geigy Corporation
Ramsuer R. W.
Randolph John D.
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