Aqueous pigment dispersion
AssigneeKao Corporation
InventorsTakayuki Suzuki, Takako Yamamoto, Erika Maekawa, Yasufumi Ueda
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Abstract
The present invention relates to a pigment water dispersion containing a pigment, a crosslinked polymer and water, in which the crosslinked polymer is prepared by crosslinking a carboxy group-containing polymer with a crosslinking agent, and has an acid value of not less than 70 mgKOH/g and not more than 300 mgKOH/g; and the pigment water dispersion further contains a formaldehyde-releasing compound. The pigment water dispersion of the present invention is excellent in storage stability even when being stored under high-temperature conditions for a long period of time.
Claims17
A pigment water dispersion comprising a pigment, a crosslinked polymer and water, in which the crosslinked polymer is prepared by crosslinking a carboxy group-containing polymer with a polyfunctional epoxy compound, and has an acid value of not less than 70 mgKOH/g and not more than 300 mgKOH/g;
- and the pigment water dispersion further comprises a formaldehyde-releasing compound,
- wherein the carboxy group-containing polymer is an acrylic polymer, and the formaldehyde-releasing compound is at least one compound selected from the group consisting of 1,3,5-triazine-1,3,5-(2H, 4H, 6H)-tris(ethanol), 1,3 -bis(hydroxymethyl)-5,5-dimethyl hydantoin and cis-1-(3-chloroallyl)-3,5,7-triaza-1-azonia adamantane chloride,
- wherein a content of water in the pigment water dispersion is not less than 50% by mass and not more than 90% by mass.
Dependencies are inferred from the claim text.