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:
Mar. 07, 1989
Filed:
Jan. 27, 1987
Olof Wallquist, Marly, CH;
Abul Iqbal, Ettingen, CH;
Johannes Pfenninger, Wilmington, DE (US);
Alain C Rochat, Fribourg, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
Process for the preparation of brominated pyrrolo-[3,4-c]pyrrole pigments by bromination of a pyrrolo-[3,4-c]-pyrrole or of a mixture of different pyrrolo-[3,4-c]-pyrroles of the formula I ##STR1## with an amount of a brominating agent which supplies 0.5 to 70 equivalents of bromine, with or without a solvent, and subsequent isolation of the brominated pyrrolo-[3,4-c]-pyrrole by removal of the excess brominating agent and, if appropriate, the solvent by customary methods. The desired brominated pyrrolo-[3,4-c]pyrroles are obtained directly in a high yield by this process. Reference is made to claim 1 in respect of the meaning of substituents A, B and Z.