Offset printing ink pigment dispersant, offset printing ink varnish and offset printing ink

摘要

PROBLEM TO BE SOLVED: To provide a novel pigment dispersant which can improve the flowability of off-set printing ink and the glossiness of a print ink film.SOLUTION: A pigment dispersant for off-set printing ink (1) comprises an amide compound (A) obtained by the reaction between rosin (a1) and polyalkylene polyamine (a2), and has an acid number of 1-30, an amine value of 100-280, and a softening point of 70-100°C.