C.i. pigment red 112 with improved dispersion

A pigment red, dispersing technology, applied in organic dyes, azo dyes, household appliances, etc., can solve problems such as performance impact

Active Publication Date: 2010-09-15
CLARIANT FIANCE (BVI) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these larger amounts often lead to correspondingly large effects on other properties, which are mostly undesirable

Method used

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  • C.i. pigment red 112 with improved dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1.1) Preparation of the diazonium salt solution of 2,4,5-trichloroaniline:

[0047] 250 parts of water were previously added and at room temperature first 40.3 parts of 2,4,5-trichloroaniline were added with stirring and admixed with 193 parts by volume of 31% strength hydrochloric acid. It was then cooled to 0°C with ice. The diazotization was carried out with 29 parts by volume of a 40% strength sodium nitrite solution. The diazonium salt solution formed is filtered off into a receiving vessel after addition of a clarification aid. Excess nitrite was removed by adding sulfamic acid and the temperature was maintained at 10°C by external cooling.

[0048] 1.2) Preparation of a solution of the coupling component (naphthol):

[0049] At room temperature, 190 parts of water and 28 parts by volume of 33% sodium hydroxide solution, and 1 part of alkylsulfonate were pre-added, and 60 parts of N-(2-methylphenyl)-2-hydroxy-3 - Naphthamide. The mixture was stirred until a c...

Embodiment 2

[0057] The synthesis was carried out as described in Example 1, where step 1.3) was followed by grinding the precipitated coupler via a Dispax mill. The dispersion hardness is 25, the residual coupler content is 0.69%, and the polychlorinated biphenyl content is 3ppm.

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Abstract

The present invention provides a process for preparing uncoated, readily dispersible C.I. Pigment Red 112 by azo coupling in a microreactor, which comprises precipitating the coupling component in an upstream microreactor and coupling the precipitated coupling component in finely divided form to the diazo component in a microreactor. The C.I. Pigment Red 112 of the invention features low dispersion harshness in alkyd resin varnish, and a PCB content of below 25 ppm.

Description

Background technique [0001] In order to incorporate pigments as color-imparting components in paints, printing inks (Drucktinte), synthetic resins or varnishes, they must be as finely divided as possible by dispersion in the respective application medium, which often involves a great deal of time and effort. related to energy expenditure. In this mechanical process, the agglomerates are broken up and the surface of the pigment is wetted by the binder system. Only then can the pigment fully reveal its application-technical properties. Manufacturers of pigmented products prefer those pigments whose dispersal costs are as low as possible. [0002] A whole series of different possibilities have been described how to prepare readily dispersible pigments. Dispersibility can be improved by surface modification, surface treatment, surface covering or the presence of specific inert auxiliaries or reagents. Another possibility is the preparation of a flush color paste from an aqueou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B29/15C09B67/20C09D201/00C09D11/02C09D5/00
CPCC09B41/008C09D7/007C08K5/0041C09D11/037C09D7/41
Inventor L·施耐德M·雷夫
Owner CLARIANT FIANCE (BVI) LTD
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