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High-purity naphthol as pigments

A pigment, naphthol technology, applied in the field of azo pigments, can solve expensive, laborious, difficult and other problems

Inactive Publication Date: 2007-04-11
CLARIANT PROD DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, scale-up of new products from laboratory scale to large industrial scale is costly and laborious for batch processes, for example due to tank and agitator geometry or heat transfer having a significant effect on primary particle size, particle size distribution and color properties, and may cause difficulties

Method used

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  • High-purity naphthol as pigments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Example 1: C.I. Pigment Red 269

[0070] a1) Preparation of Anisbase (Anisbase) diazonium salt solution:

[0071] 2532 g of water were added as an initial charge and at room temperature first 242 g of 3-amino-4-methoxy-N-benzanilide were homogeneously stirred in, precipitated by addition of hydrochloric acid and cooled with 1.5 kg of ice / water to 10°C. During the diazotization of the precipitated hydrochloride with 138 ml of sodium nitrite solution (40%), an easily stirrable anisidine-diazonium solution was finally formed. This solution was filtered off into a receiving vessel after addition of a clarification aid. Excess nitrite is removed by adding sulfamic acid.

[0072] a2) Preparation of buffer for anisidine diazonium salt solution:

[0073] 1884 g of ice / water were added as an initial charge and 502 g of acetic acid were added as well as 614 g of aqueous sodium hydroxide solution, and the temperature was kept at room temperature after the addition of 1 kg of w...

Embodiment 2

[0091] Example 2: C.I. Pigment Red 146

[0092] Steps a)-d) are carried out analogously to Example 1. The pigments obtained after step c) contain anisidine, chloromethoxyaniline, anisidine triazene and naphthol AS below the respective detection limit.

Embodiment 3

[0093] Example 3: C.I. Pigment Red 147

[0094] Steps a)-d) are carried out analogously to Example 1. The pigments obtained after step c) contain anisidine, chloromethoxyaniline, anisidine triazene and naphthol AS below the respective detection limit.

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Abstract

Naphthol AS pigments of formula (IV) have a maximum content of the secondary components (1) to (5) defined by the following upper limits (see the table).

Description

technical field [0001] The present invention relates to the field of azo pigments. Background technique [0002] Naphthol AS pigments are of particular interest to the industry because they generally achieve high tinctorial strength and cover the magenta region of technical ink formulations. They also have good light fastness. [0003] Naphthol AS pigments are traditionally produced by batch processes. A common feature of these methods is the requirement for precise control and maintenance of process parameters: such as temperature, time, thorough mixing and concentration of colorants and suspensions are constant for yield, color properties and fastness of the pigments obtained and for their quality Sex is decisive. Similarly, scale-up of new products from laboratory scale to large industrial scale is costly and laborious for batch processes, for example due to tank and agitator geometry or heat transfer having a significant effect on primary particle size, particle size ...

Claims

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Application Information

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IPC IPC(8): C09B41/00C09B67/54B01J19/00C09B29/20
CPCB01J19/0093C09B29/20B01J2219/00783C09B67/0096C09B41/006B01J2219/00873C09B41/00C09B67/0079
Inventor U·罗尔R·鲍尔
Owner CLARIANT PROD DEUT GMBH
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