A high-hydrophobic, low-bleeding color lake powder, a method for preparing the sane and a use thereof are provided. A color lake powder is dispersed into water, and a pH value of a system is adjusted to a range of 4 to 5.5. Then surface treating agents such as a silane coupling agent, a titanate coupling agent, a hydrogenated lecithin and an aliphatic acid are used to modify the color lake powder. Then pulverizing and drying the resultant to obtain the modified color lake powder.

A method for preparing dispersant using lignin degradation products includes preparation of lignin degradation products: degrading lignin which are used as raw materials using alkali through microwave-assisted activation at the presence of a metal oxide catalyst to obtain the lignin degradation products; and preparation of dispersant: preparing dispersant by molecularly reforming and chemically modifying the lignin degradation products obtained in the step of preparation of lignin degradation products.

An ink set for inkjet recording, comprising a first aqueous ink comprising a colorant stabilized by cationic dispersing groups and a capsule composed of a polymeric shell surrounding a core; the core comprising one or more chemical reactants capable of forming a reaction product upon application of heat and/or light and the capsule is stabilized by cationic dispersing groups; a second aqueous ink comprises a colorant stabilized by anionic dispersing groups and a capsule composed of a polymeric shell surrounding a core; the core comprising one or more chemical reactants capable of forming a reaction product upon application of heat and/or light and the capsule is stabilized by anionic dispersing groups.

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 composition includes a pigment, a pigment derivative which has at least one group selected from the group consisting of groups represented Formula (2): -L-NH—R.sup.2, and the like, a dispersant which has a constitutional unit having an adsorbing group and a constitutional unit having a steric repulsive group, and is a random copolymer or an alternating copolymer, and a solvent. In Formula (2), L represents —CO—, —SO.sub.2—, or —PO(R.sup.21)—, R.sup.21 represents a hydrogen atom or a monovalent organic group having 1 or more carbon atoms, R.sup.2 represents —COR.sup.22, —SO.sub.2R.sup.22, or —PO(R.sup.22).sub.2, and R.sup.22's each independently represent a hydrogen atom or a monovalent organic group having 1 or more carbon atoms.

The issue of the present invention is to provide a disazo pigment with high safety in which the content of chemical substances that may be harmful, in particular, in the food packaging field and the like and that may be regulated substances is reduced. A disazo pigment according to the present invention has a polychlorinated biphenyl content of less than 15 ppm and a primary aromatic amine content of less than 700 ppm. Preferably, the disazo pigment is at least one selected from a group consisting of C.I. Pigment Yellow 83, C.I. Pigment Yellow 13, and Cl. Pigment Yellow 14.

The present invention provides an aqueous pigment-material solution which has excellent thermal stability and less fading particularly even under an acidic condition, a method for producing the same, and a blue-colored beverage. Provided are an aqueous pigment-material solution including a pigment material containing 20 mmol to 200 mmol of polycarboxylic acid having one or more hydroxy groups, in terms of carboxylic acid equivalent, per 1 g of phycocyanin, in which when both the phycocyanin and the polycarboxylic acid are added such that a color value represented by absorbance at 620 nm is 2.5 to 5, an optical density per 1 cm of an optical path length at 800 nm is 0.05 or lower at a hydrogen ion concentration (pH) of 3 or lower, a method for producing the aqueous pigment-material solution, and a blue-colored beverage.

The present invention provides an aqueous pigment dispersion liquid being such that a pigment is finely dispersed, and the viscosity, and the particle diameters of the pigment are unlikely to fluctuate, being excellent in storage stability, and enabling preparation of an emulsion-polymerized toner having properly controlled particle diameters while improving the pigment utilization rate. The aqueous pigment dispersion liquid is an aqueous pigment dispersion liquid for an emulsion-polymerized toner containing a pigment, a dispersant, and an aqueous medium. The dispersant is a polymer containing a constitutional unit (A) derived from a monomer (A) such that a group containing a (meth)acryloyloxy group or the like is bonded to one end of a particular polyethylene glycol chain or the like, and a constitutional unit (B) derived from a monomer (B) having a carboxy group or the like, the polymer has a number average molecular weight in terms of polystyrene of 4,000 to 15,000, as measured by gel permeation chromatography, the polymer is contained in a state of being not ionized substantially, and the aqueous pigment dispersion liquid has a pH of 3.0 to 8.4.

Provided is an aqueous dispersion of colored particles suitable for colorants for writing instrument inks, inkjet inks, painting materials, aqueous coatings, and the like. The aqueous dispersion of colored particles includes a polymer having at least a unit of a monomer derived from a dye having a polymerizable unsaturated group. The monomer derived from the dye is preferably derived from the compound represented by General Formula (1) below: ##STR00001##
where Dye represents a dye residue, R.sub.1 represents a hydrogen atom or a methyl group,
Y.sub.2 represents —O— or —NR.sub.10—, where R.sub.10 represents a hydrogen atom or an alkyl group,
A.sub.1 represents an alkylene group which is unsubstituted or substituted by at least one group selected from —OCO—, —COO—, —NHCONH—, and the like in the chain thereof and/or at the terminal thereof, and/or a hydroxy group.

A new yellow pigment excellent in both brightness and coloring power is provided. It has been found that dimerization of a specific quinophthalone skeleton gives more selective absorption and transmittance. Furthermore, the dimerization method was also studied, and it has been found that excessive reddish tone can be suppressed by cleaving the conjugate using a methylene chain as a spacer instead of simply employing a direct bond. In addition, dispersibility has been improved by polyhalogenation and introduction of an imide structure. Furthermore, a coloring agent containing the quinophthalone compound and a coloring composition containing the coloring agent are provided.