| abstract |
An ink composition is provided which can realize annimage having excellent rubbing/scratch resistance andnwaterfastness, is free from a clogged nozzle problem, andnenables stable printing. The ink compositionncomprises a colorant, a fine particle of a polymer, anwater-soluble organic solvent, and water, the fine particlenof the polymer having a film-forming property, a carboxylngroup on its surface, and a reactivity with a divalentnmetal salt such that, when three volumes of an aqueousnemulsion, of the fine particle of the polymer, having anfine particle concentration of 0.1% by weight is broughtninto contact with one volume of an aqueous divalent metalnsalt solution having a concentration of 1 mol/liter, thentime for the transmission of light at a wavelength of 700nnm to be decreased to 50% of the initial transmission isnnot more than 1 x 10 4 sec. |