Process for conditioning an azo pigment, and use thereof

Details Process for conditioning an azo pigment, and use thereof Process for conditioning an azo pigment, and use thereof

C - Chemistry, Metallurgy

09

B

260/178, 8/19

C09B 33/02 (2006.01) C08K 5/23 (2006.01) C09B 35/02 (2006.01) C09B 67/00 (2006.01) C09B 67/10 (2006.01) C09B 67/54 (2006.01)

Patent

CA 1155836

Abstract In a process for conditioning an azo pigment by alkaline reprecipitation, the crude pigment, in a polar organic solvent, is converted to a pigment salt by adding a base, the azo pigment is reprecipitated by adding an acid and the acidic pigment suspension is then heated, with stirring, and the crystalline pigment obtained is isolated. The process results in crystals of improved form, improved texture and more advantageous rheological properties The conditioned azo pigments are parti- cularly suitable for colouring high-molecular organic material.

378525

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