Aqueous pigment dispersions having monomers in the polymeric dispersant capable of interacting with cellulose are described. These monomers include the ones having a structure of Formula (I): ##STR00001## wherein W is O or NH; R.sup.1 is C.sub.1-C.sub.8 alkyl; and R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are independently H or C.sub.1-C.sub.5 alkyl.

The present invention provides an aqueous pigment dispersion including at least a pigment, colloidal silica, bio-nanofibers having an average diameter of 1 nm to 100 nm and an aspect ratio of 100 or more, an anionic group-containing organic polymer compound, and also provides an aqueous ink. The bio-nanofibers are preferably cellulose nanofibers or chitosan nanofibers, and the ratio between the pigment, the colloidal silica, and the bio-nanofibers preferably satisfies (1) colloidal silica/pigment=1/100 to 20/100 or (2) colloidal silica/bio-nanofibers=1/2 to 10/1 and (3) bio-nanofibers/pigment=1/100 to 15/100.

Provided are thin leaf-like indium particles having a first peak and a second peak at a greater particle diameter than a particle diameter at which the first peak appears in a volume-based particle size distribution representing a relationship between particle diameters of indium particles and ratios by volume of the indium particles at the particle diameters, wherein a volume V1 of the indium particles at the first peak and a volume V2 of the indium particles at the second peak satisfy a formula (V1/V2)×100≥25%.

The problem to be solved by the present invention is to provide a method for producing an aqueous pigment dispersion that has certain dispersion stability with which the formation of coarse particles with time and the settling of a pigment and the like with time can be reduced and that can be used for producing an ink having excellent discharge stability. The present invention relates to a method for producing an aqueous pigment dispersion, the method including kneading a composition including a pigment including one or more materials selected from the group consisting of a violet pigment, a green pigment, and an orange pigment and a resin, the composition having a nonvolatile content of 50% by mass or more, under predetermined conditions and subsequently performing a centrifugation treatment.

The present invention aims to provide a copolymerized polyester and a resin composition which are excellent in storage stability, water-resistant adhesion, processability, weathering resistance and leveling property. According to the present invention, there is provided a copolymerized polyester containing a polyvalent carboxylic acid component and a polyhydric alcohol component as copolymerization components, wherein, when a content of the polyvalent carboxylic acid component is taken as 100% by mole, a content of an alicyclic polyvalent carboxylic acid component is 50% by mole or more, and wherein the copolymerized polyester has an acid value of 170 to 1000 equivalents/10.sup.6 g.

A colored dispersion that contains (A) a dye derivative, (B) a water-insoluble dye, (C) a dispersant, and water. The (A) component contains an anthraquinone-based compound represented by formula (al), the (C) component does not contain a polyoxyethylene aryl phenyl ether and a polyoxyethylene aryl phenyl ether sulfate at the same time, and the mass ratio ((B)/(A)) of the (B) component with respect to the (A) component satisfies the relationship 400>(B)/(A)>3.125. A recording medium having the colored dispersion adhered thereto and a hydrophobic fiber printing method using the colored dispersion. In formula (a1), each of R.sup.a1-R.sup.a5 is a hydrogen atom, and X.sup.a1 is a group represented by formula (a4). In formula (a4), Z.sup.a3 is an optionally-substituted amino group

##STR00001##

A colored dispersion that contains (A) a dye derivative, (B) a water-insoluble dye, (C) a dispersant, and water. The (A) component contains an anthraquinone-based compound represented by formula (a1), the (C) component contains a polyoxyethylene aryl phenyl ether and a polyoxyethylene aryl phenyl ether sulfate, and the mass ratio ((B)/(A)) of the (B) component with respect to the (A) component satisfies the relationship 400>(B)/(A)>3.125. A recording medium having the colored dispersion adhered thereto and a hydrophobic fiber printing method using the colored dispersion. In formula (a1), each of R.sup.a1-R.sup.a5 is a hydrogen atom, and X.sup.a1 is a group represented by formula (a4). In formula (a4), Z.sup.a3 is an optionally-substituted amino group

##STR00001##

Rhamnolipids and/or sophorolipids can be used in coating compositions for improvement of the speed of wetting of pulverulent formulation constituents in such compositions, which leads to a reduction in dust nuisance during incorporation thereof and to the increase in occupational safety in the production of coating compositions. Rhamnolipids and/or sophorolipids can also be used in coating compositions for obtaining improved homogeneous colour appearance of the dry paint film with regard to difference in hue, ascertained from the delta E and visual assessment.

A dispersion liquid includes water, a coloring material, a dispersion resin that disperses the coloring material, and a compound having s sulfonate group and a polymerizable group. The dispersion resin has a constituent unit A containing a hydrophobic monomer and a constituent unit B containing a monomer having a sulfonate group. The weight-average molecular weight of the dispersion resin is 5,000 to 100,000, and the molecular weight of the compound is 300 or less.

The present invention provides a pigment water dispersion that is excellent in dispersion stability, and also excellent in ejection properties even when used as an ink for ink-jet printing. The present invention relates to [1] a pigment water dispersion containing (A) a pigment, (B) a carboxy group-containing crosslinked polymer and (C) an alkyl group-containing ethanolamine having a pKa of not less than 8.7, [2] a water-based ink containing the pigment water dispersion, an organic solvent and a surfactant, and [3] a process for producing a pigment water dispersion, including step (I) of subjecting a mixture containing the pigment (A), a crosslinkable polymer, the aforementioned ethanolamine (C), an organic solvent and water to dispersion treatment, thereby obtaining a dispersion of pigment-containing polymer particles containing the pigment (A) and the crosslinkable polymer that is adhered onto the pigment (A); step (II) of removing the organic solvent from the obtained dispersion, thereby obtaining a water dispersion of the pigment-containing polymer particles; and step (III) of further subjecting the polymer to crosslinking reaction with a crosslinking agent, thereby obtaining the pigment water dispersion containing pigment-containing crosslinked polymer (B) particles.