Bayer Corporation

Sun Chemical Corporation

Miles Inc.

Thomas R Flatt

Daphne J Rice

Brian L Thompson

Wengan Wu

Richard Kent Faubion

Mark A Putnam

Tracie Tibbs

Bobby Mims

Ulrich Feldhues

Abdul Sattar

Charles E Shannon

Mark W Johnson

Robert C Mott

Richard A Vogel

Novel crystal forms of solid solutions of 2,9-dimethyoxyquinacridone and 2,9-dichloroquinacridone. The crystal forms may be formed by a process comprising the steps of: a) heating a mixture of 2,5-di(4-methoxyanilino)terephthalic acid, and 2,5-di(4-chloroanilino)terephthalic acid in polyphorsphoric acid at a temperature less than 1050 C to form a mixture of 2,9-dimethoxyquinacridone and 2,9-dichloroquinacridone; b) combining the mixture of 2,9-dimethoxyquinacridone and 2,9-dichloroquinacridone with water; and c) heating the mixture of 2,9-dimethoxyquinacridone and 2,9-dichloroquinacridone at a temperature not more than 110&#xb0; C. Another crystal form may be formed by the process of heating a mixture of 2,9-dimethoxyquinacridone and 2,9-dichloroquinacridone in a polar aprotic solvent. These products are may be used for coloring fibers, plastics, paints, coatings, printing inks, color filters, cosmetics, automotive coatings, textiles, fibers, powder coatings, in-mold coatings, laminate films, and the like.

Crystal forms of quinacridones made from 2,9-dimethoxyquinacridone and 2,9-dichloroquinacridone

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.

Methods for preparing perylene/perinone pigments

Process for the continuous drowning of perylene melt

This invention relates to a continuous process for the preparation of quinacridone pigments by

Process for the continuous preparation of quinacridones

This invention relates to a process for conditioning organic pigments by

Process for conditioning organic pigments

This invention relates to pigment compositions prepared by precipitating a blend of (a) about 60 to about 95 percent by weight of a perylene pigment having the formula ##STR1## wherein R.sup.1 and R.sup.2 are independently C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.7 cycloalkyl, C.sub.7 -C.sub.16 aralkyl, or C.sub.6 -C.sub.10 aryl; and (b) about 5 to about 40 percent by weight of a polycyclic aromatic compound containg at least 5 aromatic rings wherein at least one ring is substituted with at least one keto group.

Crystal growth modifiers for perylene pigments

This invention relates to a novel process for the continuous preparation of perylenetetracarboxylic diimides by fusion of a naphthalimide in a mixture of an alkali metal hydroxide and, optionally, an alkali metal carboxylate to form an initial leuko condensation product that is subsequently oxidized in an aqueous medium to form the perylenetetracarboxylic diimide.

Process for the continuous preparation of perylenetetracarboxylic

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Summerville, SC, United States of America

Thomas R Flatt