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US 4,072,690 AGranted
Indolyl methylene leuco dyestuffs
AssigneeCiba-Geigy Corporation
InventorsRobert Garner, John B. Henshall, Jean-Claude Petitpierre
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AssigneeCiba-Geigy Corporation
InventorsRobert Garner, John B. Henshall, Jean-Claude Petitpierre
Estimating the term…
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.
An indolyl methylene compound of the formula ##STR36## wherein X.sub.3 represents alkyl with 2 to 12 carbon atoms or benzyl, Y.sub.3 represents hydrogen, methyl, ethyl or phenyl, Z.sub.1 represents an aralkyl radical selected from benzyl and styryl, an aryl radical selected from phenyl, diphenyl or naphthyl which is unsubstituted or substituted hy halogen, methylenedioxy, nitro, alkyl having 1 to 4 carbon atoms or by alkoxy having 1 to 4 carbon atoms, or indolyl unsubstituted or substituted by halogen, cyano, nitro, alkyl with 1 to 4 carbon atoms, alkoxy with 1 to 4 carbon atoms, alkanoyl with 2 to 4 carbon atoms or phenyl.
An indolyl methylene compound according to claim 3 of the formula ##STR37## wherein X.sub.4 represents alkyl with 2 to 8 carbon atoms or benzyl, Y.sub.4 represents methyl or phenyl and Z.sub.2 represents styryl, phenyl, or naphthyl, said phenyl radical is unsubstituted or substituted by halogen, methylene-dioxy, nitro, methyl or methoxy.
Dependencies are inferred from the claim text.