Archroma IP Gmbh

Erwin Lucic

David Hyett

Michèle Catherine Christianne Janssen

Jorg Hubner

Karin Hendrika Maria Bessembinder

Pierre L Woestenborghs

Michele Catherine Christianne Janssen

Marinus Petrus Wilhelmus Maria Rijkers

Jörg HÜBNER

Jorg HÜBNER

Aqueous leucoindigo solution comprising an aromatic amine, in particular aniline or aniline and N-methylaniline, wherein the concentration of the aromatic amine is below 200 ppm, wherein the leucoindigo salt in the solution is in the form of a mixed sodium and potassium salt, wherein the molar ratio of sodium to potassium is in the range of from above 3:1 to 10:1, preferably wherein the concentration of the salt is in the range of from above 25 to 45% by weight, based on the total weight of the solution.

Purified concentrated aqueous leucoindigo salt solutions

Stable aqueous leucoindigo solution comprising an aromatic amine in the form of aniline or aniline and N-methylaniline, wherein said leucoindigo is in the form of an alkali metal salt; wherein the concentration of the aromatic amine is below 40 ppm determined according to ISO 14362-1:2017(E); and wherein the concentration of the leucoindigo salt is in a concentration range of from 10 to 45% by weight based on the total weight of the solution, and wherein the stability of the solution is measured at a temperature of 23&#xb0; C.; or wherein the concentration of the leucoindigo salt is in a concentration range of from 45 to 65% by weight based on the total weight of the solution, and wherein the stability of the solution is measured at a temperature of 60&#xb0; C.

Leucoindigo salt solution with very low content of aniline and method of making same

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Erwin Lucic