Process for preparing metalized azo pigments

Details Process for preparing metalized azo pigments Process for preparing metalized azo pigments

C - Chemistry, Metallurgy

09

B

260/175.4

C09B 45/22 (2006.01) C09B 29/15 (2006.01) C09B 63/00 (2006.01)

Patent

CA 1085387

ABSTRACT Process for preparing metalized azo pigment by diazotizing one of 2-chloro-5-amino-toluene-4-sulfonic acid and 2-chloro-4- amino-toluene-5-sulfonic acid, contacting the diazo with an inorganic salt of calcium, coupling the diazo with 3-hydroxy-2- naphthoic acid, and contacting the coupled diazo with an inorganic salt of strontium. The resulting metalized azo pigment exhibits high stability in aqueous coating compositions.

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