Patent ID: 7741386

Claim:
A process for producing a water dispersion for inkjet printing which comprises: step 1 of adding a monomer mixture to an organic solvent containing α-methylstyrene dimer at a rate of from 0.5 to 20 g/h per one gram of the α-methylstyrene dimer, to polymerize the monomer mixture in the presence of the α-methylstyrene dimer, to synthesize a polymer whereby at least a portion of the α-methylstyrene dimer is incorporated into the main chain of the polymer; step 2 of mixing the polymer obtained in the step 1, a colorant, an organic solvent and water and then subjecting a resulting mixture to a dispersing treatment, to obtain a dispersion of polymer particles containing the colorant; and step 3 of removing the organic solvent from the dispersion obtained in the step 2.