Heat-sensitive recording material containing a malachite green color former
AssigneeCiba-Geigy Corporation
InventorsRobert Garner, Jean Claude Petitpierre
Life of this patent
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Abstract
A heat-sensitive recording material which contains as color former at least one compound of the general formula ##STR1## wherein R.sub.1 and R.sub.2, which can be the same or different, represent hydrogen, alkyl of at most 12 carbon atoms which is unsubstituted or substituted by cyano or halogen, alkoxyalkyl of 2 to 8 carbon atoms, benzyl or phenyl, R.sub.3 represents hydrogen, halogen, nitro, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms, and Z represents alkenyl of at most 12 carbon atoms, unsubstituted or ring-substituted aralkyl or aralkenyl, or represents the radical of a reactive organic methylene compound or of a heterocyclic compound which does not contain active methylene groups.
Claims14
A heat sensitive recording material containing at least one color former and at least one electron acceptor in at least one binder layer on paper, said color former having the formula ##STR18## wherein R.sub.1 and R.sub.2, which can be the same or different, represent hydrogen, alkyl of at most 12 carbon atoms which is unsubstituted or substituted by cyano or halogen, alkoxyalkyl of 2 to 8 carbon atoms, benzyl or phenyl,
- R.sub.3 represents hydrogen, halogen, nitro, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms, and
- Z represents alkenyl of at most 12 carbon atoms, unsubstituted or ring-substituted aralkyl or aralkenyl, or represents the radical of a reactive organic methylene compound or of a heterocyclic compound which does not contain active methylene groups.
Dependencies are inferred from the claim text.