Abstract: The present invention relates to pigment and coating compositions that are used to prepare pigmented coatings that exhibit geometric metamerism or metallic flop. The inventive pigment compositions comprise a small particle size pigment, at least one flop-enhancing agent, optionally one or more pigment property enhancing compounds. The flop-enhancing agent is selected from the group consisting of a halogenated copper phthalocyanines, indanthrones or carbazole dioxazines or mixtures thereof that are unsubstituted or substituted in the benzene rings by halogen, —NR1R2, C1-C10alkyl and —X—NR1′R2′, wherein R1 and R2 are independently hydrogen, C1-C10alkyl or —X—NR1′R2′, R1′ and R2′ are independently hydrogen or C1-C10alkyl, and X is C1-C10alkylene. The pigment property enhancing compounds may be a texture improving agent, a rheology improving agent, an antiflocculating compound and a dispersibility improving compound.

Abstract: The present invention relates to the host-guest solid solutions formed from a mixture of 1,4-diketo-3,6-bis(4-chlorophenyl)pyrrolo[3,4-c]pyrrole (para-dichloro DPP) and 1,4-diketo-3,6-bis(4-methylphenyl)pyrrolo[3,4-c]pyrrole (para-dimethyl DPP). The mixture contains between 30-80 mol percent of para-dimethyl DPP and 70-20 mol percent of para-dichloro DPP. The present invention further relates to the preparation of the solid solutions, and to the use of the solid solutions and binary solid compounds as pigments.

Abstract: The present invention relates to a process for producing alpha, gamma-I, gamma-II and gamma-III crystal modifications of quinacridone and transparent quinacridone pigments including the solid solutions of various quinacridones, using a variety of tris-aryl-s-triazines, particularly resorcinol triazine derivatives, or aromatic- or heteraromatic-compounds having at least one hydroxyl or keto group bonded to the ring, as an additive, prior to or concurrently with the oxidation of corresponding dihydroquinacridone salts.

Abstract: The present invention relates to a process for producing alpha, gamma-I, gamma-II and gamma-III crystal modifications of quinacridone and transparent quinacridone pigments including the solid solutions of various quinacridones, using a variety of tris-aryl-s-triazines, particularly resorcinol triazine derivatives, or aromatic- or heteraromatic-compounds having at least one hydroxyl or keto group bonded to the ring, as an additive, prior to or concurrently with the oxidation of corresponding dihydroquinacridone salts.

Abstract: The invention is directed to a process for preparing a bis(hydroxymethyl)perylenetetracarboximide compound by reacting perylene-3,4,9,10-tetracarboximide with formaldehyde. The bis(hydroxymethyl)perylenetetracarboximide can be isolated or further reacted in a one pot synthesis to yield a compound of the formula wherein X1 and X2 are organic radicals.

Abstract: The invention is directed to a process for preparing a bis(hydroxymethyl)perylenetetracarboximide compound by reacting perylene-3,4,9,10-tetracarboximide with formaldehyde.

Abstract: The invention is directed to a process for preparing a bis(hydroxymethyl)perylenetetracarboximide compound by reacting perylene-3,4,9,10-tetracarboximide with formaldehyde. The bis(hydroxymethyl)perylenetetracarboximide can be isolated or further reacted in a one pot synthesis to yield a compound of the formula wherein X1 and X2 are organic radicals.

Abstract: A process for preparing an unsubstituted or substituted quinacridone of the formula or a solid solution of quinacridones of the formula (I), wherein X and Y are independently 1 or 2 substituents selected from hydrogen, fluorine, chlorine, C1-C3alkyl, C1-C3alkoxy and COOR wherein R is hydrogen or C1-C10alkyl in which a salt of a corresponding 6,13-dihydroquinacridone of formula II  having the same substitutions as the desired quinacridone of formula I, or a mixture of corresponding 6,13-dihydroquinacridones of formula II, is oxidized with an oxygen containing gas in the presence of an aqueous base and a catalytically effective amount of an oxidation catalyst, characterized in that the oxidation is performed in the presence of an polyglycolic reaction medium of formula R1—O—[(CH2)m—(CHR1′)n—O]x—O—R1″  (III).

Abstract: Ternary solid solutions useful as pigments are disclosed. The ternary solid solutions result from incorporating a third component, which is a diketopyrrolopyrrole or quinacridone pigment, into the crystal lattice of the mixed crystal formed from equimolar amounts of two different diketopyrrolopyrrole pigments.

Abstract: Ternary solid solutions useful as pigments are disclosed. The ternary solid solutions result from incorporating a third component, which is a diketopyrrolopyrrole or quinacridone pigment, into the crystal lattice of the mixed crystal formed from equimolar amounts of two different diketopyrrolopyrrole pigments.

Abstract: This disclosure relates to a process for preparing bis(hydroxymethyl)pyrrolopyrrole compounds of the formula wherein A.sub.1 and A.sub.2 are aryl radicals, by reacting a 1,4-diketopyrrolopyrrole with formaldehyde. The compound of formula (II) can be isolated or further reacted in a one pot synthesis to yield a compound of the formula ##STR1## wherein B.sub.1 and B.sub.2 are organic radicals.

Abstract: This disclosure relates to a process for preparing bis(hydroxymethyl)pyrrolopyrrole compounds of the formula ##STR1## wherein A.sub.1 and A.sub.2 are aryl radicals, by reacting a 1,4-diketopyrrolopyrrole with formaldehyde. The compound of formula (II) can be isolated or further reacted in a one pot synthesis to yield a compound of the formula ##STR2## wherein B.sub.1 and B.sub.2 are organic radicals.

Abstract: Pigment compositions comprising a pigment and both a phthalimidomethylquinacridone and a pyrazolylmethylquinacridone as additives are disclosed. The disclosed pigment compositions are useful for coloring coating compositions. Coating composition colored with the inventive pigment compositions have excellent rheological characteristics and which yield coatings having excellent saturation.