Patent ID: 8690303

Claim:
An image forming method comprising: ejecting an ink composition including a volatile organic solvent with a solubility parameter (SP value) of 20 MPa 1/2 to 25 MPa 1/2 , acid-functionalized polymer colloid particles with a glass transition temperature of 25° C. to 85° C., and a pigment with a surface at least a part of which is coated with a polymer, onto a non-porous substrate by an ink jet method to form an image, wherein the absolute value of the difference between a solubility parameter (SP value) of the non-porous substrate and the solubility parameter of the volatile organic solvent of the ink composition is less than or equal to 15 MPa 1/2 , and wherein the volatile organic solvent includes alkylene glycol alkyl ether and an alkylene oxide adduct of glycerin represented by the following structural formula (1): wherein AO represents propyleneoxy, each of l, m, and n independently represents an integer of 1 or more, and the sum of l, m, and n equals 4.