AZO LAKE PIGMENT COMPOSITION AND PREPARATION THEREOF

摘要

PROBLEM TO BE SOLVED: To obtain an azo lake pigment compsn. which, when used in a printing ink, can offer an ink possessing heat resistance, transparency, sharpness, tinting strength, fluidity and other properties by using a compound prepd. by substituting a part of a diazonium component in an azo lake pigment by a specific compd. SOLUTION: This azo lake pigment compsn. is prepd. by coupling a diazonium salt of an aniline deriv. having a water-soluble group withβ-naphthol orβ-oxynaphthoic acid and conducting laking after or simultaneously with the coupling. This azo lake pigment is one prepd. by substituting 0.1 to 30mol% of an aniline deriv. by a compd. represented by the formula (wherein X represents a carboxyl group; (m)>2; Y represents H, a halogen, or an alkyl, alkoxy, acetyl, hydroxyl, or aryl group; and (n) is 1 to 3) to prepare a mixed diazo component and then conducting coupling and laking.