Provided is a black pigment that enables pattern formation of pixel division layer while suppressing generation of development residue. The black pigment comprises (a) a core containing at least one organic black pigment selected from the group consisting of benzodifuranone-based black pigments, perylene-based black pigments, azo-based black pigments, and isomers thereof and (b) a coating layer containing silica and/or a metal oxide and/or a metal hydroxide.

The present invention relates to a dispersant derived from anhydride functionalized polyester derived from carboxylic acid functionalized polyester. The anhydride functionalized polyester is then reacted with a multi-amine species forming amide and salt bonds. The technology allows lower reaction temperatures when the multi-amine species is present. The lower reaction temperature allows the use of a broader selection of polyester repeat units.

Provided herein are compositions useful as ink or coatings which contain novel dispersants that are capable of dispersing pigments which are traditionally difficult to disperse while maintaining acceptable levels of viscosity. Use of dispersants as taught herein enables the preparation of a wide variety of inks and coatings having high pigment loading and existing within a conventionally-useful viscosity range.

Provided is a composition with which a film that allows transmission of infrared light in a state where noise generated from visible light is small can be formed. In addition, provided are a film, a laminate, an infrared transmitting filter, a solid image pickup element, and an infrared sensor. This composition includes: a coloring material that allows transmission of infrared light and shields visible light; an infrared absorber; and a curable compound, in which the infrared absorber includes a material that shields light in a wavelength range of longer than 1000 nm and 1200 nm or shorter. In the composition, a ratio A/B of a minimum value A of an absorbance of the composition in a wavelength range of 400 to 1100 nm to a maximum value B of an absorbance of the composition in a wavelength range of 1400 to 1500 nm is 4.5 or higher.

The present technology is directed to pigment compositions having a pure, or substantially pure, crystal form, containing less chlorine than standard tetrachlorinated copper phthalocyanine pigments, while giving similar color space, chromaticity, fastness properties, and color travel in automotive waterborne and solvent borne systems. These pigments are more advantageous from a toxicity and environmental perspective, and allow the manufacturer to produce pigments in a safe and economical manner.

Provided are an irreversibly discoloring pigment for preventing overheating, a thermochromic molded article including the same, and a method of preparing the same, and more particularly, a discoloring pigment which becomes discolored when overheated, and then maintains the discoloration even after being cooled to room temperature, a thermochromic molded article including the discoloring pigment, and methods of preparing the discoloring pigment and the thermochromic molded article.

A coloring composition includes a metal azo pigment, a compound having an ethylenically unsaturated bonding group, and a solvent, the metal azo pigment includes at least one kind of an anion selected from an azo compound represented by Formula (I) or an azo compound having a tautomeric structure of the azo compound represented by Formula (I), two or more kinds of metal ions, and a melamine compound, and in Formula (I), R.sup.1 and R.sup.2 each independently represent OH or NR.sup.5R.sup.6, R.sup.3 and R.sup.4 each independently represent O or NR.sup.7, and R.sup.5 to R.sup.7 each independently represent a hydrogen atom or an alkyl group.

##STR00001##

A color material dispersion liquid comprising: (A) a color material, (B) a dispersant and (C) a solvent, wherein the color material (A) contains a lake color material of a combination of an acid dye and a polyaluminum chloride; a basicity of the polyaluminum chloride is 70% or more; and a value of a ratio (I.sub.4/I.sub.6) between an integral value (I.sub.4) of a peak corresponding to a four-coordinate aluminum in a solid-state .sup.27Al-NMR spectrum of the lake color material and an integral value (I.sub.6) a peak corresponding to a six-coordinate aluminum therein, is from 0 to 0.50.

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

A pigment composition including at least one pigment selected from the group consisting of a perinone-based pigment and a perylene-based pigment, water, a resin having a constitutional unit represented by Formula 1, and at least one compound selected from the group consisting of a phthalimide compound having a carboxyalkyl group and a naphthalimide compound having a carboxyalkyl group; a method for producing thereof; and an aqueous ink composition using the pigment composition. In Formula 1, R.sup.1 represents a hydrogen atom or a methyl group, L.sup.2 represents C(O)O, OC(O), or C(O)NR.sup.2 and R.sup.2 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R.sup.3 represents an alkyl group having 6 or more carbon atoms.

##STR00001##