INK COMPOSITION

摘要

A pigment ink composition for inkjet recording, which can provide excellent print stability, resistance of printed matter and driability. The ink composition is characterized by containing at least a pigment, an organic solvent and two or more kinds of binder resins having different weight average molecular weights (Mw).  The ink composition is also characterized in that when the binder resin having the lowest weight average molecular weight (Mw) among the two or more kinds of binder resins is represented by a and the binder resin having a higher weight average molecular weight (Mw) than the binder resin a is represented by ß, the following general formulae (1), (2) and (3) are satisfied. general formula (1): Mwß - Mwa = 10,000 general formula (2): 1,000 < Mwa < 30,000 general formula (3): 20,000 < Mwß < 100,000 In the formulae, Mwa represents the weight average molecular weight of the binder resin a and Mwß represents the weight average molecular weight of the binder resin ß.