Abstract: A process for preparing a modified beta quinacridone polytype having identified color space values which comprises the steps of dry pre-milling beta phase quinacridone, deaggregating the pre-milled product in an alcohol-base medium and ripening the deaggregated product in the presence of an oxidizing agent.

Abstract: Pearlescent coating compositions comprising a resin binder system, coated mica particles and a manganese salt of an azo pigment, these coating compositions being of particular value in two coat automotive paint systems wherein the pearlescent composition is applied as the base coat which is covered with a clear top coat to provide paint systems with intense color, high pearlescence and excellent durability.

Abstract: A process for preparing opaque pigmentary quinacridone derivatives which comprises milling the starting quinacridone materials at ambient or near ambient temperatures in the presence of an alcohol and a base.

Abstract: A process for preparing pigmentary solid solutions of at least one quinacridone derivative and the parent quinacridone compound which comprises milling the starting quinacridone materials at ambient or near ambient temperatures in the presence of an alcohol and a base.

Abstract: Process for the preparation of brominated pyrrolo-[3,4-c]pyrrole pigments by bromination of a pyrrolo-[3,4-c]-pyrrole or of a mixture of different pyrrolo-[3,4-c]-pyrroles of the formula I ##STR1## with an amount of a brominating agent which supplies 0.5 to 70 equivalents of bromine, with or without a solvent, and subsequent isolation of the brominated pyrrolo-[3,4-c]-pyrrole by removal of the excess brominating agent and, if appropriate, the solvent by customary methods.The desired brominated pyrrolo-[3,4-c]pyrroles are obtained directly in a high yield by this process.Reference is made to claim 1 in respect of the meaning of substituents A, B and Z.

Abstract: The invention relates to a process for the preparation of pyrrolo[3,4-c]pyrroles of formula (1) ##STR1## wherein each of R.sub.1 and R.sub.2 independently of the other is an alkyl or aralkyl group or an isocyclic or heterocyclic aromatic radical, which process comprises reacting an ester of formula (2) or (3) ##STR2## with a nitrile of the formula R.sub.2 CN, in which formulae each of R and R' independently of the other is an alkyl or aryl group, and R.sub.1 and R.sub.2 are as defined above, in the presence of a strong base in an organic solvent.The invention also relates to compounds of formula (8) ##STR3## wherein R.sub.3 is an alkyl or aralkyl group or an ortho-substituted isocyclic or heterocyclic aromatic radical and R.sub.4 is an alkyl or aralkyl group or an isocyclic or heterocyclic aromatic radical.The pyrrolopyrroles obtained are valuable pigments for coloring compounds of high molecular weight such as plastics and lacquers in yellow to red shades of excellent fastness properties.

Abstract: The invention relates to pyrrolinones of formula (1) ##STR1## wherein R.sub.1 is an alkyl group containing at least 2 carbon atoms, an aralkyl group, an isocyclic or heterocyclic aromatic radical and R is an alkyl or aryl group.The invention also relates to aminodicarboxylates of formula (2) ##STR2## wherein R.sub.1 is a defined in claim 1 and R and R' are the same or different and are alkyl or aryl.The aminodicarboxylates of formula (2) are prepared by condensing a disuccinate of the formulaR'OOCCH.sub.2 CH.sub.2 COORwith a nitrile of the formula R.sub.1 CN, in the presence of a strong base and zinc chloride.The pyrrolinones of formula (1) are obtained by reacting the aminodicarboxylates of formula (2) in the presence of a strong base in an organic solvent.The compounds of formulae (1) and (2) are valuable intermediates for pigments.

Abstract: The invention relates to a mixture of at least two different pigments of the formula ##STR1## with the difference lying in the meanings of the radicals A and B, in which the formula (I) A and B are the same or different alkyl, aralkyl, cycloalkyl, carbocyclic or heterocyclic aromatic radicals, which mixture of pigments is obtainable by(a) reacting 1 mole of a disuccinate with 1.75 to 1.998 moles of a nitrile of the formula ACN and 0.002 to 0.25 mole of a nitrile of the formula BCN or of a mixture of several nitriles of the formula BCN, the radicals B of which are different from A, or(b) reacting 1 mole of a lactam of formula (II) or of an enamine of formula (III) ##STR2## in which formula each of R and R' independently of the other is alkyl or aryl, with 0.75 to 0.998 mole of a nitrile of the formula ACN and 0.25 to 0.

Abstract: The invention relates to pyrrolinones of formula (1) ##STR1## wherein R.sub.1 is an alkyl group containing at least 2 carbon atoms, an aralkyl group, an isocyclic or heterocyclic aromatic radical and R is an alkyl or aryl group.The invention also relates to aminodicarboxylates of formula (2) ##STR2## wherein R.sub.1 is as defined in claim 1 and R and R' are the same or different and are alkyl or aryl.The aminodicarboxylates of formula (2) are prepared by condensing a disuccinate of the formulaR'OOCCH.sub.2 CH.sub.2 COORwith a nitrile of the formula R.sub.1 CN, in the presence of a strong base and zinc chloride.The pyrrolinones of formula (1) are obtained by reacting the aminodicarboxylates of formula (2) in the presence of a strong base in an organic solvent.The compounds of formulae (1) and (2) are valuable intermediates for pigments.

Abstract: The invention relates to a process for the preparation of pyrrolo[3,4-c]pyrroles of formula (1) ##STR1## wherein each of R.sub.1 and R.sub.2 independently of the other is an alkyl or aralkyl group or an isocyclic or heterocyclic aromatic radical, which process comprises reacting an ester of formula (2) or (3) ##STR2## with a nitrile of the formula R.sub.2 CN, in which formulae each of R and R' independently of the other is an alkyl or aryl group, and R.sub.1 and R.sub.2 are as defined above, in the presence of a strong base in an organic solvent.The invention also relates to compounds of formula (8) ##STR3## wherein R.sub.3 in an alkyl or aralkyl group or an ortho-substituted isocyclic or heterocyclic aromatic radical and R.sub.4 is an alkyl or aralkyl group or an isocyclic or heterocyclic aromatic radical.The pyrrolopyrroles obtained are valuable pigments for coloring compounds of high molecular weight such as plastics and lacquers in yellow to red shades of excellent fastness properties.