The present invention relates to a dispersant having a tertiary or quaternary amine anchoring group and a solubilizing polymer selected from C.sub.8-50 fatty acid; a C.sub.8-50 ak(en)yl substituted succinic acid, anhydride or partial ester; a dimer or trimer fatty acid; and/or polymers from repeating units of polyesters, polyethers, polyacrylate, polyamides, polyurethanes or mixtures of said repeating units in a random or blocky copolymer. The dispersants are an improvement in that the alkylene connecting group between the tertiary or quaternized amine and the solubilizing polymer lacks abstractable hydrogen atoms at the geminal carbon atom from the nitrogen of the tertiary or quaternized amine over the prior art. The dispersants are useful as dispersants with improved thermal stability and low amounts yellow color after aging at elevated temperatures.

The present invention relates to [1] a process for producing pigment-containing modified polymer particles, including the step of reacting pigment-containing polymer particles (A) containing a functional group and a compound (B) containing a reactive group capable of reacting with the functional group of the polymer particles (A) in a medium under such a condition that a ratio [(B)/(A)] of total moles of the reactive group of the compound (B) to total moles of the functional group of the polymer particles (A) is from 0.10 to 0.62; [2] a pigment water dispersion including an aqueous medium and the modified polymer particles produced by the aforementioned process which are dispersed in the aqueous medium; and [3] an ink including the aforementioned pigment water dispersion and an organic solvent. The modified polymer particles are free from formation of coarse particles upon production of pigment particles, so that an ink obtained by using the modified polymer particles can be prevented from suffering from increase in viscosity thereof when the ink is being concentrated by evaporation of water from the ink, and is excellent in rub fastness when printed on a low-water absorbing recording medium.

Provided are a coloring resin composition including a resin, a coloring material, and an organic solvent, in which the resin includes a resin A including a repeating unit (A) represented by Formula (a), where, in Formula (a), L.sup.a1 represents a trivalent group, Ar.sup.a1 represents an aromatic hydrocarbon group having a substituent, the substituent is a group having a structure in which a bonding portion with the aromatic hydrocarbon group is an ester bond or an amide bond, in the ester bond, an atom on a side different from an oxygen atom in the ester bond is on a side of the bonding portion with the aromatic hydrocarbon group, and in the amide bond, an atom on a side different from a nitrogen atom in the amide bond is on a side of the bonding portion with the aromatic hydrocarbon group; a film formed of the coloring resin composition; a color filter; a solid-state imaging element; and an image display device.

##STR00001##

There are disclosed aqueous pigment dispersions containing dispersant-improving-agents, and methods of preparing and using the same.

The present invention relates to a dispersant composition comprising: a) at least one oligomeric acid A, which has i) at least one acidic group selected from COOH and PO.sub.3H.sub.2, and ii) at least one polyoxyalkylene-ether radical of the formula (I): R—(O-A).sub.xO-G-, where A is an C.sub.2-C.sub.4-alkan-1,2-diyl radical; X is an integer having a number average value in the range from 2 to 20; and R is hydrocarbon radical having from 1 to 30 carbon atoms; G is a chemical bond or a carbonyl group; and b) at least one polyamine B, which is selected from the group consisting of polyvinylamines, poly-C.sub.2-C.sub.3-alkyleneimines, modified poly-C.sub.2-C.sub.3-alkyleneimines, melamine compounds, modified melamine compounds, poly-(C.sub.2-C.sub.4-alkyleneether) amines, polyetheramine polyols, and modified polyetheramine polyols. The invention also relates to aqueous pigment compositions containing a dispersant composition as defined herein, a pigment component, selected from the group consisting of pigments and mixtures of at least one pigment and at least one filler, and an aqueous diluent.

There are disclosed aqueous pigment dispersions containing dispersant-improving-agents, and methods of preparing and using the same.

An infrared-absorbing composition includes particles of an infrared-absorbing coloring agent and a solvent, in which the particles in the infrared-absorbing composition have two or more maximal absorption wavelengths exhibited in a wavelength range of 650 to 1500 nm, and in the range, in a case where an absorbance at a maximal absorption wavelength existing on a second shortest wavelength side is set to 1, an absorbance at a maximal absorption wavelength existing on a shortest wavelength side is 0.6 to 2.0.

Fluid concentrates, colorants and coating compositions contain solid pigment particles dispersed in a nonvolatilizing, reactive liquid diluent having a viscosity less than 1,000 cps and containing at least one molecular species having at least three reactive unsaturated sites. The reactive liquid diluent may serve as one or more of a dispersing medium for the solid pigment particles, a carrier, a coalescent and a humectant, and may crosslink or otherwise cure to form an interpenetrating polymer network in, or crosslink with, a pigmented coating composition containing a film-forming polymeric binder. Embodiments of the reactive liquid diluent can provide colorants and coating compositions having reduced levels of VOCs, conventional carriers, conventional dispersants, conventional coalescents and conventional humectants.

An object of the present invention is to provide a colored resin composition, which is useful in production of a color filter suitable for an organic EL display device, excellent in low temperature curability, and also excellent in red color reproducibility. The present invention relates to the colored resin composition containing a colorant, a resin, a polymerizable compound, and a polymerization initiator, wherein the colorant is composed of only pigments, and the pigments include C.I. Pigment Violet 29, a red pigment and a yellow pigment.

A magenta pigment dispersant can include a mixture of quinacridones including a first quinacridone including two nitrogen- and aromatic-containing pendant groups and a second quinacridone with one nitrogen- and aromatic-containing pendant group.

##STR00001##