Pigment composition and ink using the same

Abstract

An object of the present invention is to provide a pigment composition and an ink (in particular, a waterborne ink) that can reduce a viscosity increase over time when an azo lake pigment is used as a pigment and also have excellent color strength and gloss in printed products. The pigment composition according to the present invention includes a divalent metal lake azo pigment, and 0.1% by weight to 20% by weight of a divalent metal salt of a mono- or di-carboxylic acid compound. The divalent metal of the divalent metal salt is preferably an alkaline earth metal ion. The mono- or di-carboxylic acid compound is preferably a mono- or di-carboxylic acid compound having a carbon number of 4 to 20.

Dependencies are inferred from the claim text.