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:
Dec. 18, 2012
Filed:
Jun. 30, 2008
Johannes Loebel, Mannheim, DE;
Andreas Stohr, Freinsheim, DE;
Johannes Loebel, Mannheim, DE;
Andreas Stohr, Freinsheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process for preparing perylene pigments of the general formula (Ia) or (Ib) or mixtures thereof, by reacting perylenetetracarboxylic acids or functional derivatives thereof with aromatic diamines, where R, Rmay be the same or different and may each independently be phenylene, naphthylene or pyridylene, where R, Rmay each be mono- or polysubstituted by C-C-alkyl, C-C-alkenyl, C-C-alkoxy, hydroxyl and/or halogen, X, X, X, X, X, X, X, Xmay be the same or different and may each independently be hydrogen or halogen, wherein the reaction is performed in the presence of a secondary or tertiary amine in an aqueous reaction medium.