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:
May. 14, 2019
Filed:
Feb. 18, 2008
Heinrich Kowarsch, Oberderdingen, DE;
Josef Hetzenegger, Birkenheide, DE;
Andreas Stohr, Freinsheim, DE;
Hans-joachim Uschmann, Schwetzingen, DE;
Heinrich Kowarsch, Oberderdingen, DE;
Josef Hetzenegger, Birkenheide, DE;
Andreas Stohr, Freinsheim, DE;
Hans-Joachim Uschmann, Schwetzingen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The invention provides a process for preparing N,N'-di(3′,5′-dimethylphenyl)perylene bis(dicarboximide), and other pigments having modified properties, by reaction of perylene-3,4,9,10-tetracarboxylic dianhydride with 3,5-dimethylaniline, or a mixture of 3,5-dimethyl aniline and at least one other primary amine, in the presence of a secondary amine or tertiary amine as catalyst, wherein the reaction occurs in an aqueous reaction medium and in the presence of added seed crystals of N,N′-di(3′,5′-dimethylphenyl) perylenebis(dicarboximide), such that the aqueous medium is present at the beginning of the reaction.