Abstract: The invention accordingly relates to a method for preparing transparent C.I. Pigment Violet 23 by salt kneading a Pigment Violet 23-crude in the presence of a crystalline salt and an organic liquid. Said method is characterized in that the organic liquid is propylene carbonate.

Abstract: The invention accordingly relates to a method for preparing transparent C.I. Pigment Violet 23 by salt kneading a Pigment Violet 23-crude in the presence of a crystalline salt and an organic liquid. Said method is characterized in that the organic liquid is propylene carbonate.

Abstract: The invention is directed to an electrophotographic toner or developer, powder coating, ink jet ink or an electronic media having an azo colorant prepared by conducting the diazotization of aromatic or hetaromatic amines or the azo coupling reaction or the diazotization and the azo coupling reaction in a microreactor.

Abstract: The invention relates to a method for the production of a pigment masterbatch by extrusion, wherein a) a thermoplastic polymer in granular or powder form is metered continuously into a twin-screw extruder; b) the polymer metered in is melted in the extruder; c) a pumpable pigment press cake containing pigment, water and/or organic solvent is metered continuously into the molten polymer through an inlet port of the extruder under elevated pressure, the pressure being sufficiently high that the boiling point of the water and/or organic solvent is higher than the internal temperature of the extruder in the region of this inlet port; d) optionally a flow improver is added; e) the pigment is dispersed into the molten polymer from the press cake by the action of shear forces; f) the water and/or organic solvent are removed through at least one outlet port of the extruder, under elevated pressure, the pressure being sufficiently high that the boiling point of the water and/or organic solvent is higher than the inter

Abstract: The invention is directed to an electrophotographic toner or developer, powder coating, ink jet ink or an electronic media having an azo colorant prepared by conducting the diazotization of aromatic or hetaromatic amines or the azo coupling reaction or the diazotization and the azo coupling reaction in a microreactor.

Abstract: The invention is directed to an electrophotographic toner or developer, powder coating, ink jet ink or an electronic media having an azo colorant prepared by conducting the diazotization of aromatic or hetaromatic amines or the azo coupling reaction or the diazotization and the azo coupling reaction in a microreactor.

Abstract: The invention relates to a method for the production of ?-keto-carboxylic acid derivatives of formula (I) or the salts thereof, where X?NR?, O or S, R, R?, R1-R4 independently ?H, alkyl, alkenyl, aryl or heteroaryl, by reaction of a diketene of formula (II) with a compound comprising an active hydrogen of formula ROH, NHRR? or RSH, characterised in that the reaction is continuously carried out in a microreactor.

Abstract: A process for preparing diketopyrrolopyrrole pigments comprises conducting the elementary steps of pigment synthesis (reaction and hydrolysis) in a miniaturized continuous reactor.

Abstract: A process for preparing symmetrical or asymmetrical trans-thiazineindigo pigments of the formula (1) which comprises a) condensing, in an aqueous medium, a compound of the formula (2) with a compound of the formula (3a) or (3b) or a compound of the formula (4) with a compound of the formula (3a) and/or (3b)  by maintaining the reaction mixture at a temperature between 30 and 65° C. for at least 1 hour and then b) maintaining the reaction mixture at a temperature between 100 and 180° C. and a pressure between 2 and 50 bar for at least 1 hour in the presence of an amide.

Abstract: A process for preparing alcoholic solutions of alkali metal alkoxides. The process includes reacting an alkali metal with an alcohol in a microreactor wherein the microreactor provides laminer flow.

Abstract: A process for preparing diketopyrrolopyrrole pigments comprises conducting the elementary steps of pigment synthesis (reaction and hydrolysis) in a miniaturized continuous reactor.

Abstract: The invention provides a process for the fine division of pigments which comprises spraying a coarsely crystalline crude pigment and/or a poorly dispersible prepigment in suspension form through nozzles to a point of conjoint collision in a reactor chamber enclosed by a housing in a microjet reactor, a gas or an evaporating liquid being passed into the reactor chamber through an opening in the housing for the purpose of maintaining a gas atmosphere in the reactor chamber, and the resulting pigment suspension and the gas or the evaporated liquid being removed from the reactor through a further opening in the housing by means of overpressure on the gas entry side or underpressure on the product and gas exit side.

Abstract: A process for preparing diketopyrrolopyrrole pigments comprises conducting the elementary steps of pigment synthesis (reaction and hydrolysis) in a miniaturized continuous reactor.

Abstract: The invention is directed to an electrophotographic toner or developer, powder coating, ink jet ink or an electronic media having an azo colorant prepared by conducting the diazotization of aromatic or hetaromatic amines or the azo coupling reaction or the diazotization and the azo coupling reaction in a microreactor.

Abstract: The invention provides a process for preparing azo colorants which comprises spraying one or more coupling components individually or in a mixture and one or more compatible diazonium salts individually or in a mixture, in their solution or suspension form through nozzles to a point of conjoint collision in a reactor chamber enclosed by a housing in a microjet reactor, a gas or an evaporating liquid being passed into the reactor chamber through an opening in the housing for the purpose of maintaining a gas atmosphere in the reactor chamber, and the resulting product solution or suspension and the gas or the evaporated liquid being removed from the reactor through a further opening in the housing by means of overpressure on the gas entry side or underpressure on the product and gas exit side.

Abstract: The invention provides a process for the fine division of pigments which comprises dissolving coarsely crystalline crude pigments in a solvent and precipitating them with a liquid precipitation medium by spraying the pigment solution and the precipitation medium through nozzles to a point of conjoint collision in a reactor chamber enclosed by a housing in a microjet reactor, a gas or an evaporating liquid being passed into the reactor chamber through an opening in the housing for the purpose of maintaining a gas atmosphere in the reactor chamber, and the resulting pigment suspension and the gas or the evaporated liquid being removed from the reactor through a further opening in the housing by means of overpressure on the gas entry side or underpressure on the product and gas exit side.

Abstract: Azo colorants are prepared by conducting the diazotization of aromatic or hetaromatic amines or the azo coupling reaction or the diazotization and the azo coupling reaction in a microreactor.

Abstract: The invention relates to an advantageous process for producing highly concentrated pigment presscakes which comprises concentrating a pigment suspension on a high-pressure filter press with a pressure of at least 16 bar to a pigment content of at least 50% by weight without adding nonionic surfactants which have a cloud point in water.

Abstract: The invention provides a process for preparing azo colorants which comprises spraying one or more coupling components individually or in a mixture and one or more compatible diazonium salts individually or in a mixture, in their solution or suspension form through nozzles to a point of conjoint collision in a reactor chamber enclosed by a housing in a microjet reactor, a gas or an evaporating liquid being passed into the reactor chamber through an opening in the housing for the purpose of maintaining a gas atmosphere in the reactor chamber, and the resulting product solution or suspension and the gas or the evaporated liquid being removed from the reactor through a further opening in the housing by means of overpressure on the gas entry side or underpressure on the product and gas exit side.

Abstract: The invention provides a process for preparing liquid pigment preparations which comprises spraying a from 10 to 80% by weight suspension of a crude pigment, prepigment and/or pigment, based on the overall weight of the suspension, in a flocculation-stabilizing, liquid medium through nozzles to a point of conjoint collision in a reactor chamber enclosed by a housing in a microjet reactor, a gas or an evaporating liquid being passed into the reactor chamber through an opening in the housing for the purpose of maintaining a gas atmosphere in the reactor chamber, and the resulting liquid pigment preparation and the gas or the evaporated liquid being removed from the reactor through a further opening in the housing by means of overpressure on the gas entry side or underpressure on the product and gas exit side.