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US 7,741,386 B2Granted
Water-based ink for inkjet printing
AssigneeKao Corporation
InventorsAkira Umada, Koji Azuma, Nobushige Tanaka, Nobuyuki Takizawa, Takehiro Tsutsumi
Life of this patent
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Abstract
A water dispersion for inkjet printing which contains polymer particles containing a colorant. The polymer constituting the polymer particles is produced by the copolymerization of a monomer mixture in the presence of a-methylstyrene dimer. The water dispersion for inkjet printing and a water-based ink for inkjet printing containing the water dispersion exhibit excellent jetting properties and a high optical density.
Claims7
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.
1 more element
Dependencies are inferred from the claim text.