The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 1976
Filed:
Jan. 23, 1975
Robert Garner, Bury, EN;
John Barry Henshall, Manchester, EN;
Jean-Claude Petitpierre, Kaiseraugst, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
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.