US 8,013,053 B2Granted

Water-based inks for ink-jet printing

AssigneeKao Corporation

InventorsHiroyuki Yoshida, Isao Tsuru, Ryuma Mizushima

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Abstract

The present invention relates to a water-based ink for ink-jet printing which exhibits a high optical density even upon one-pass printing on plain papers and is suitable for high-speed printing, and a dispersion used in the water-base ink. There are provided a water dispersion for ink-jet printing, including water-insoluble polymer particles containing a colorant, and a nonionic organic compound satisfying the following conditions I and II: I: Water containing 0.001% by weight of the nonionic organic compound has a surface tension of 70 mN/m or less as measured at 25° C.; and II: A solubility of the nonionic organic compound in 100 g of water is 0.30 g or less as measured at 25° C., a water-based ink containing the water dispersion, and a method of conducting a one-pass printing using the water-based ink.

Claims5

Dependent claims

A water dispersion for ink jet printing, comprising water-insoluble polymer particles containing a colorant, and a nonionic organic compound satisfying the following conditions I and II:

I:
Water containing 0.001% by weight of the nonionic organic compound has a surface tension of 70 mN/m or less as measured at 25° C.;
and
II:
A solubility of the nonionic organic compound in 100 g of water is 0.30 g or less as measured at 25° C.,
wherein the nonionic organic compound is 2-ethylhexyl glyceryl ether and/or isodecyl glyceryl ether;
wherein a content of the nonionic organic compound in the water dispersion is from 0.3 to 2.0% by weight;
and
wherein the water-insoluble polymer is a graft polymer which contains a constitutional unit derived from polypropylene glycol mono(meth)acrylate represented by the following formula:
wherein R3 is a hydrogen atom or a methyl group, and x is a number from 1 to 30.

7 more elements

Dependencies are inferred from the claim text.