A task to be achieved by the present invention is to provide an aqueous pigment dispersion which can be used in the production of an ink having reduced coarse particles so that the ink exhibits excellent dispersibility of the pigment in the aqueous pigment dispersion and excellent storage stability on such a level that a change of the physical properties with time is unlikely to be caused. The present invention is directed to an aqueous pigment dispersion including: a pigment (A) including C.I. Pigment Orange 43(a) having a primary particle diameter of 150 nm or less; a pigment dispersing resin (B) including a radical polymerization polymer having an acid value of 80 to 150 mg KOH/g; and water (C).

Provided are a polycarbonate resin composition comprising a polycarbonate resin, pentaerythritol tetrastearate, a black dye, and a blue dye, and an optical molded product comprising same.

A process for the production of a particle composition containing, at least one resin and at least one pigment is described, said process comprising the following steps: *extrusion of a mixture containing said at least one resin and said at least one pigment without induced heating; *subsequent extrusion, with induced heating, of the mixture obtained from the preceding extrusion; *granulation of the mixture thus obtained. With the abovementioned process it is possible to obtain a composition having granules with an average diameter less than 2 microns and a greater homogeneity than the known processes.

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.

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The present invention provides a pyrimidoquinazoline pigment having a novel pyrimidine skeleton, the pyrimidoquinazoline pigment having excellent pigment properties, such as coloring power and durability, and excellent infrared reflectivity and a method for producing the pyrimidoquinazoline pigment, and a pigment colorant using the pyrimidoquinazoline pigment. The present invention relates to a pyrimidoquinazoline pigment represented by the following formula (1), wherein R.sub.1 and R.sub.2 each independently represent a benzene ring or a naphthalene ring optionally having a substituent, and a method for producing the pyrimidoquinazoline pigment. In addition, the present invention relates to a pigment colorant containing the pyrimidoquinazoline pigment. ##STR00001##

A diketopyrrolopyrrole pigment compound having high weather resistance, a preparation method therefor and a use thereof, which relate to the technical field of organic pigments. The diketopyrrolopyrrole pigment compound has the structural formula (I). ##STR00001## The described diketopyrrolopyrrole pigment compound may be directly used as a wet filter cake, or may be further formed into a flowing solid powder or granulated into a granulated preparation. In the various applications described, the diketopyrrolopyrrole pigment compound exhibits high saturation, good rheology, hiding power, and gloss, high tint strength, and particularly high weather resistance. The diketopyrrolopyrrole pigment compound having high weather resistance, the preparation method therefor and the use thereof have good market prospects.

A process for preparing an aqueous dispersion of pigment particles is described. The pigment particle contains a pigment and an aminoplast resin which surrounds or embeds the pigment. The process includes (i) a step of subjecting an aqueous suspension of a pigment in the form of coarse particles to milling so that the coarse particles are comminuted in the presence of a polymeric dispersant to a particle diameter d(v 0.9) of below 1500 nm, as determined by laser diffraction; and (ii) a step of polycondensation of an aminoplast pre-condensate in the aqueous suspension of the comminuted particles of the pigment obtained in step (i) or during the milling of step (i). The polycondensation is performed in the presence of an acid catalyst at pH of below 5.5. The aqueous dispersion obtained by the process and the use of the aqueous dispersion for tinting waterborne liquid coating composition are also described.

It is an object of the present technology to overcome the disadvantages of conventional chlorination of a copper phthalocyanine which produces copper phthalocyanine, wherein the number of chlorines is less than than or equal to 4. The pigments described herein contain less chlorine than standard commercial grades of tetrachlorinated (or greater) copper phthalocyanine pigments while achieving similar color space, chromaticity, fastness properties, and color travel in automotive waterborne and solvent borne systems. The inventive pigments are more advantageous from a toxicity and environmental perspective, and allow the manufacturer to produce pigments in a safe and economical manner.

An embodiment of the present invention is to provide a resin composition including a near infrared absorbing coloring agent represented by Formula (1) and a resin, a resin molded article, and a method of producing a resin molded article. In Formula (1), a ring A and a ring B each independently represent an aromatic ring or a heteroaromatic ring, X.sup.A and X.sup.B each independently represent a monovalent substituent, G.sup.A and G.sup.B each independently represent a monovalent substituent, kA represents an integer of 0 to n.sub.A, kB represents an integer of 0 to n.sub.B, n.sub.A represents the largest integer of G.sup.A which may be substituted in the ring A, n.sub.B represents the largest integer of G.sup.B which may be substituted in the ring B, X.sup.A and G.sup.A, and X.sup.B and G.sup.B may be respectively bonded to one another to form a ring, and in a case where a plurality of G.sup.A's and G.sup.B's are present, the plurality of G.sup.A's and the plurality of G.sup.B's may be respectively bonded to one another to form a ring structure.

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