US 10,883,007 B2Granted

Aqueous pigment dispersion

AssigneeKao Corporation

InventorsSatoshi Kunii, Teruyuki Fukuda, Satoshi Tanaka, Yuki Suzuki

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Abstract

The present invention relates to [1] a pigment water dispersion containing pigment-containing crosslinked polymer particles, in which a crosslinked polymer in the particles is a polymer that is crosslinked with a compound represented by the general formula (1), and the pigment is a carbon black, and [2] a process for producing a pigment water dispersion containing pigment-containing crosslinked polymer particles, including the following steps: Step (1): subjecting a pigment mixture containing a water-dispersible polymer, a pigment and water to dispersion treatment, thereby obtaining an aqueous pigment dispersion solution containing pigment-containing polymer particles; and Step (2): mixing the aqueous pigment dispersion solution obtained in the step (1) and a compound represented by the general formula (1) to react the water-dispersible polymer with the compound to prepare a crosslinked polymer, thereby obtaining the pigment water dispersion containing pigment-containing crosslinked polymer particles.

Claims11

Dependent claims

A pigment water dispersion comprising pigment-containing crosslinked polymer particles,

in which a crosslinked polymer in the particles is a polymer that is crosslinked with
diethylene glycol diglycidyl ether, wherein a content of a chloride ion as an impurity in the crosslinking agent is not more than 8.0% by mass and not less than 0% by mass,
the crosslinked polymer is a crosslinked product of a water-dispersible polymer which is obtained by crosslinking the water-dispersible polymer with the crosslinking agent, and the water-dispersible polymer is a vinyl polymer comprising a constitutional unit derived from (a) a hydrophobic monomer, a constitutional unit derived from (b) an ionic monomer, and a constitutional unit derived from (c) a nonionic monomer, and
the nonionic monomer (c) is at least one monomer selected from the group consisting of polyalkylene glycol (meth)acrylates, alkoxy polyalkylene glycol (meth)acrylates, and aralkoxy polyalkylene glycol (meth)acrylate,
in which the pigment is a carbon black, wherein a DBP oil absorption of the carbon black is not less than 50 mL/100 g and not more than 200 mL/100 g.

2 more elements

Dependencies are inferred from the claim text.