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:
Oct. 25, 1977
Filed:
Mar. 15, 1976
Robert Garner, Ramsbottom, EN;
Jean Claude Petitpierre, Kaiseraugst, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
Nitro-phthalides of the formula ##STR1## in which E is a radical of the formula ##STR2## X and X' each represents alkyl with 1 to 12 carbon atoms, alkoxy with 1 to 12 carbon atoms or acyloxy with 2 to 12 carbon atoms, and X may also be hydrogen. Z represents hydrogen, alkyl having 1 to 12 carbon atoms or phenyl, Y represents hydrogen, alkyl having 1 to 12 carbon atoms, benzyl or cyanoethyl, R.sub.1, R.sub.2, R.sub.1 ' and R.sub.2 ', independently of the other, represents hydrogen, alkyl with 1 to 12 carbon atoms, alkoxyalkyl with 2 to 8 carbon atoms, cycloalkyl with 5 or 6 carbon atoms, benzyl or phenyl and the benzene ring B may be further substituted by halogen, nitro or an amino group optionally substituted by alkyl with 1 to 6 carbon atoms. The nitro-phthalides are particularly useful as color formers which give intense green, blue-green or blue colors when they are brought into contact with an electron-accepting co-reactant.