Water-based ink for inkjet printing
AssigneeKao Corporation
InventorsNobuyuki Takizawa, Akira Umada, Nobushige Tanaka, Takehiro Tsutsumi
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Abstract
A water dispersion for inkjet printing, which contains water-insoluble polymer particles containing a colorant. The content of the water-insoluble polymer in the water dispersion is from 1 to 7% by weight, and the surface tension of the water dispersion is 60 mN/m or higher at 20° C. A water-based ink for inkjet printing which contains the water dispersion produces printed images with a high optical density and a good color-to-color bleed resistance.
Claims9
A water dispersion for inkjet printing which comprises water-insoluble polymer particles containing a colorant, wherein a content of the water-insoluble polymer in the water dispersion s from 1 to 7% by weight, and a surface tension of the water dispersion is 60 mN/m or higher at 20° C.
The water dispersion for inkjet printing in according to claim wherein the hydrophobic monomer is a styrene-based monomers and/or an aryl ester of (meth)acrylic acid.
A process for producing a water dispersion for inkjet printing which comprises steps of:
- (1) synthesizing a water-insoluble polymer by solution polymerization;
- (2) cleaning the water-insoluble polymer obtained in the step 1 with a solvent;
- (3) mixing at least the water-insoluble polymer obtained n the step 2, a colorant an organic solvent and water, and then subjecting a resulting mixture to a dispersing treatment, to form a dispersion of water-insoluble polymer particles containing the colorant;
- and
- (4) removing the organic solvent from the dispersion obtained in the step 3.
Dependencies are inferred from the claim text.