Patent ID: 8651651

Claim:
An ink jet ink comprising a pigment, a binder resin, water, an organic solvent, and one or more surfactants and satisfying the following requirements (a), (b), and (c): Requirement (a): the ink jet ink has a surface tension in a region defined by Expression (2) when an evaporation rate X defined by Expression (1) is in a range of 0<X(%)≦20, evaporation rate X (%)={[(initial mass of ink jet ink)−(mass of ink jet ink after evaporation)]/(initial mass of ink jet ink)}×100, Expression (1) γ 0 −γ x ≧1.0 (mN/m), Expression (2) (wherein, γ 0 represents a surface tension (mN/m) of the ink jet ink before evaporation; and γ x represents a surface tension (mN/m) of the ink jet ink at an evaporation rate X % and 0<X(%)≦20); Requirement (b): the ink jet ink contains two or more organic solvents; and a content of an organic solvent of which a sum ΣSP of the hydrogen bonding term and the polarity term of the solubility parameter is 8 MPa 1/2 or more and 18 MPa 1/2 or less is 30 mass % or more and less than 95 mass % of a total amount of the organic solvents in the ink jet ink; and Requirement (c): a content of at least one of the surfactants is less than a critical micelle concentration of the surfactant.