摘要:
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.
摘要:
A process for preparing diketopyrrolopyrrole pigments comprises conducting the elementary steps of pigment synthesis (reaction and hydrolysis) in a miniaturized continuous reactor.
摘要:
A process for preparing diketopyrrolopyrrole pigments comprises conducting the elementary steps of pigment synthesis (reaction and hydrolysis) in a miniaturized continuous reactor.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
Organic pigments are conditioned by introducing a liquid prepigment suspension into a miniaturized continuous reactor and thermally treating therein.
摘要:
Organic pigments are conditioned by introducing a liquid prepigment suspension into a miniaturized continuous reactor and thermally treating therein.
摘要:
The invention provides novel pigment dispersants of the formula (I) in which is a radical of the formula (Ia) s is a number from 0.1 to 4.0 and n is a number from 0 to 2.0; and provides pigment preparations comprising an organic base pigment and a pigment dispersant of the formula (I).
摘要:
The invention relates to a method for producing pigment transparent preparations based on perylene-3,4,9,10-tetracarboxylic acid diimine of (XXX) formula, wherein u is a number between 0 and 8, when u>0; E is a chlorine or bromine atom and if u>1, possibly the combination of said atoms. The inventive method consists in wet grinding a perylimide raw pigment of the (xxx) formula in an aqueous liquid medium in the presence of at least one pigment dispersing agent of a perylene dispersing agent group and P.V. derived dispersing agents with the aid of a ball grinding mill operating at a maximum volume power of 1.0 kW per litre by the action of a grinder whose diameter is equal to or less than 5 mm, at a temperature equal to or higher than 50° C., and in isolating the such obtained pigment preparation.