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:
Sep. 14, 2010
Filed:
Dec. 08, 2006
Thomas Flatt, Dorchester, SC (US);
Thomas Flatt, Dorchester, SC (US);
Sun Chemical Corporation, Parsippany, NJ (US);
Abstract
A method for preparing a perylene pigment or perinone pigment involves a condensation reaction between perylene tetracarboxylic acid or naphthalene tetracarboxylic acid, or anhydrides or imides thereof, and amines in the presence of certain metal catalysts, such as ammonium molybdate, molybdenum oxide, and metal carbonyls, such as hexacarbonylmolybdenum, titanium carbonyl, iron carbonyls, and the like. The use of these catalysts provides various advantages, including the reduction of the amount of the catalyst, while achieves high yields, the lowering of reaction temperatures, and the reduction of insoluble sludge in the reaction mixture, thereby making the reaction operation easier and reducing the amounts of hazardous wastes containing heavy metals.