Process for producing azo pigments

Details Process for producing azo pigments Process for producing azo pigments

C - Chemistry, Metallurgy

09

B

260/175.1

C09B 29/24 (2006.01) C09B 29/15 (2006.01) C09B 67/22 (2006.01)

Patent

CA 1175042

A B S T R A C T A process for producing an azo pigment, which comprises reacting a mixture composed of (1) 2-hydroxy- naphthalene-3-carboxylic acid or its salt, (2) -naphthol or its salt and (3) a phenolic by-product having a molecular weight of about 300 and containlng about 1 equivalent of phenolic hydroxy groups obtained during the reaction of an alkali -naphtholate with carbon dioxide, with a diazonium compound of an arornatic aminosulfonic acid, and if desired, converting the product to its lake.

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