Continuous process for preparing metal complex pigments

Details Continuous process for preparing metal complex pigments Continuous process for preparing metal complex pigments

C - Chemistry, Metallurgy

09

B

C09B 45/14 (2006.01) C08K 5/3477 (2006.01) C09B 67/10 (2006.01) C09B 67/22 (2006.01)

Patent

CA 2343461

Continuous process for preparing metal complexes of polyvalent metal ions with mono-, di-, tri- or tetraanions of an azo compound conforming to the formula (I) or one of its tautomeric structures Image where R and R' are independently OH, NH2, NH-CN, arylamino, acylamino or p-chlorophenyl and R1 and R1' are independently -OH or -NH2, which intercalate at least one compound (the intercalate) different there from, by stirring a dispersion of the alkali metal salt of compound (I) with the metal salt of the selected polyvalent metal at a temperature of 10 to 35°C over a period of 1 to 25 min. admixing an aqueous solution, dispersion or emulsion of the intercalate mentioned, if appropriate with comminution of the solid particles of the mixture before andlor after the admixing of the intercalate, passing the mixture through a reaction zone at a temperature of at least 85 to 140°C, in a residence time of 1 to 15 min. optionally by regulating the pH of the mixture to a pH of 0.5 to 3, adjusting the pH of the mixture to at least pH 5 and isolating the ready- prepared metal complex intercalate.

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