Ciba-geigy Corporation

Rosalinde Braun

Rudolf Zink

Hermann Nachbur

A heat-sensitive recording material which contains

Heat-sensitive recording material

A heat-sensitive recording material whose color reactant system comprises a color former, a developer for said color former and, in addition, a sulfamide compound of formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each independently hydrogen, alkyl containing not more than 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxy, cyano or lower alkoxy; C.sub.5 -C.sub.10 cycloalkyl; phenalkyl, phenyl or naphthyl, each unsubstituted or ring-substituted by halogen, cyano, lower alkyl or lower alkoxy, or --NR.sub.2 R.sub.3 is 5- or 6-membered, preferably saturated, heterocyclic radical; with the proviso that R.sub.1, R.sub.2 and R.sub.3 may not simultaneously by hydrogen.

A pressure-sensitive or heat-sensitive recording material, comprising a support, having a developer or both a color former and a developer in or on the support, wherein the developer consists of a metal complex compound of the formula

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Riehen, Switzerland

Rosalinde Braun