Pressure-sensitive or heat-sensitive recording material containing a carbazolyl methane compound

Abstract

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 1 and X 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 1 and X 2 together with the nitrogen atom to which they are attached represent a 5- or 6-membered, heterocyclic radical, X 3 is hydrogen, halogen, nitro, lower alkyl or lower alkoxy, each of R 1 and Z 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 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.

Inventors

• 👤 Peter Burri

Bibliographic Details