Ciba-geigy Corporation

Jean-Claude Petitpierre

Robert Garner

John Barry Henshall

Indolyl methylene leuco dyestuffs of the formula ##STR1## wherein X.sub.1 and X.sub.2 independently of the other, represent alkyl with 2 to 12 carbon atoms, alkenyl with at most 12 carbon atoms or phenylalkyl with 1 to 4 carbon atoms in the alkyl part, Y.sub.1 and Y.sub.2 independently of the other, represent hydrogen, alkyl with 1 to 12 carbon atoms or phenyl, Z represents alkyl with 1 to 12 carbon atoms, alkenyl with at most 12 carbon atoms, aryl, aralkyl or a heterocyclic residue and the rings A and B may be further substituted by cyano, nitro, halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms or acyl with 1 to 8 carbon atoms, said methylene compounds are particularly useful as slow developing color formers in pressure-sensitive recording material and exhibit good light and air stability.

Indolyl methylene leuco dyestuffs

Lactone compounds of the formula ##STR1## wherein X represents alkyl with 1 to 12 carbon atoms, alkoxy with 1 to 12 carbon atoms or acyloxy with 2 to 12 carbon atoms,

Heterocyclic substituted lactone compounds

Pressure-sensitive copying or recording material which contains, in its color-producing system, as the color former, at least one azomethine compound of the formula ##STR1## WHEREIN R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represent hydrogen, alkyl of 1 to 4 carbon atoms, cyanoalkyl of 2 to 5 carbon atoms, unsubstituted benzyl or phenyl, or benzyl or phenyl substituted by halogen, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms, or

Pressure-sensitive copying or recording material

A pressure-sensitive or heat-sensitive recording material which contains as color former at least one tetrahydroquinoline compound of the general formula ##STR1## wherein EACH OF R.sub.1 and R.sub.2 represents lower alkyl, cycloalkyl or benzyl or together represent alkylene, and

Pressure-sensitive or heat-sensitive recording material

Pressure-sensitive copying material containing included in its Color-reactant system a mixture of at least two color formers, wherein at least one color former is a leuco methylene dyestuff of the formula ##EQU1## wherein Y represents an amino-substituted phenyl residue of the formula ##SPC1## Or an indolyl residue of the formula ##SPC2## Wherein R.sub.1 and R.sub.2, independently of the other represent hydrogen, alkyl with 1 to 12 carbon atoms, alkoxyalkyl with 2 to 8 carbon atoms, benzyl or phenyl, R.sub.3 is hydrogen, halogen, nitro, alkyl having 1 to 4 carbon atoms or alkoxy having 1 to 4 carbon atoms, X.sub.1 represents hydrogen, alkyl with 1 to 12 carbon atoms, alkenyl with at most 12 carbon atoms or benzyl, X.sub.2 represents hydrogen, alkyl with 1 to 12 carbon atoms or phenyl and the ring A is unsubstituted or substituted by cyano, nitro, halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms or acyl with 1 to 8 carbon atoms, and Z represents alkyl with 1 to 12 carbon atoms, alkenyl with at most 12 carbon atoms, aryl, aralkyl, an heterocyclic radical or the residue of an organic, particularly aliphatic or cycloaliphatic compound having a ketomethylene group.

Coated pressure-sensitive recording material

The invention relates to copying and recording materials such as pressure-sensitive and/or heat-sensitive material, which contains as color former specific naphthofuranes.

Growing community of inventors

Kaiseraugst, Switzerland

Jean-Claude Petitpierre