- METHODS FOR PREPARING PERYLENE/PERINONE PIGMENTS
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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.
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(2008/12/06)
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