The invention provides dispersed inorganic mixed metal oxide pigment compositions utilizing a carboxylic acid, containing dispersant and a mixed metal oxide pigment. The metal oxide pigment is of the type used to color ceramic or glass articles. The dispersant, in addition to at least one carboxylic acid group, comprises at least one 300-3000 g/mole solubilizing chain of repeating units from hydrocarbylene or repeating units from C3 or C4 alkylene ethers or mixtures of said ethers. A milling process using beads is also described to reduce the mixed metal oxide particle size to the desired range. A method of using the mixed metal oxide dispersion to digitally print an image on a ceramic or glass article using the dispersion jetted through a nozzle and firing the colored article is also described.

The present invention provides a process for producing a fine organic pigment having a very small primary particle size, and a fine organic pigment produced by the process; a process for producing a dispersion using the fine organic pigment, and a dispersion produced by the process; and a process for producing an ink using the dispersion. The present invention relates to [1] a process for producing a fine organic pigment, including step 1 of kneading a mixture prepared by blending a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and water with each other, the water being blended in an amount of not less than 0.6 part by mass and not more than 4.0 parts by mass on the basis of 100 parts by mass of the water-soluble inorganic salt; [2] a fine organic pigment produced by the process described in the above [1]; [3] a dispersion produced using the fine organic pigment described in the above [2]; [4] a process for producing a paste of a fine organic pigment, including step 2 of cleaning the kneaded mixture obtained in the step 1; [5] a process for producing a dispersion, including step 3 of subjecting the paste of the fine organic pigment produced by the process described in the above [4], an organic solvent and water to dispersing treatment; and [6] a process for producing an ink, including step 4 of mixing the dispersion produced by the process described in the above [5], with at least one material selected from the group consisting of water and an organic solvent.

The present invention relates to a modified colorant comprising a colorant having attached at least one organic group. Various embodiments of the organic group are disclosed. For each of these embodiments, preferably the organic group has a defined calcium index value. Also disclosed are various uses for these modified colorants, including inkjet ink compositions.

An object is to provide phthalocyanine pigment compositions that have good transparency, gloss, and suitability in the initial viscosity after production as well as outstanding storage stability when used in liquid ink. A copper phthalocyanine pigment composition containing copper phthalocyanine, a rosin compound, copper phthalocyanine sulfonic acid or its salt, and an aliphatic amine with the calcium content of the pigment composition being 200 ppm or less has good transparency, gloss, and suitability in the initial viscosity after production as well as outstanding storage stability when used in liquid ink.

The invention provides dispersed inorganic mixed metal oxide pigment compositions utilizing a carboxylic acid, containing dispersant and a mixed metal oxide pigment. The metal oxide pigment is of the type used to colour ceramic or glass articles. The dispersant, in addition to at least one carboxylic acid group, comprises at least one 300-3000 g/mole solubilizing chain of repeating units from hydrocarbylene or repeating units from C3 or C4 alkylene ethers or mixtures of said ethers. A milling process using beads is also described to reduce the mixed metal oxide particle size to the desired range. A method of using the mixed metal oxide dispersion to digitally print an image on a ceramic or glass article using the dispersion jetted through a nozzle and firing the coloured article is also described.

The present invention provides [1] a process for producing a fine organic pigment having a very small primary particle size, and a fine organic pigment produced by the process; a process for producing a dispersion using the fine organic pigment, and a dispersion produced by the process; and a process for producing an ink using the dispersion. The present invention relates to [1] a process for producing a fine organic pigment, including step 1 of kneading a mixture prepared by blending (A) a raw material organic pigment containing an oxygen atom and a nitrogen atom bonded to a hydrogen atom in a molecule thereof, (B) a water-soluble inorganic salt, (C) a water-soluble organic solvent, (D) water and (E) a water-soluble basic compound with each other, in which the water (D) is blended in an amount of not less than 0.6 part by mass and not more than 7.0 parts by mass on the basis of 100 parts by mass of the water-soluble inorganic salt, and the water-soluble basic compound (E) is blended in an amount of not less than 1.5 parts by mass and not more than 35 parts by mass on the basis of 100 parts by mass of the raw material organic pigment.

A C.I. Pigment Yellow 101 has an average particle size of 100 nm or more and 700 nm or less, and, in an X-ray diffraction pattern obtained by powder X-ray diffractometry, a second peak from a low angle side is present at a diffraction angle 2 in the range of 11.66 or more and 11.86 or less.

A method for producing a halogenated zinc phthalocyanine pigment includes a step of forming a halogenated zinc phthalocyanine crude pigment into a pigment. The halogenated zinc phthalocyanine crude pigment is obtained by depositing a halogenated zinc phthalocyanine, which is synthesized by using an acidic compound or a compound that generates an acid by reacting with water, and the step includes a pretreatment step of kneading the halogenated zinc phthalocyanine crude pigment along with water.

The present invention relates to new pigment preparations based on metal azo pigments and aliphatic C.sub.10-22 monocarboxylic acids, to processes for their production and their use as a yellow pigment for colouring plastics, and to the use of aliphatic C.sub.10-22 monocarboxylic acids for improving the filtration properties of pigment preparations with at the same time improved colour strengths.

A novel copolymer having excellent pigment dispersion performance, and more particularly, a novel copolymer usable as a pigment dispersing agent that can attain high luminance and high contrast of a green picture element in a color filter. The novel copolymer contains: a block chain (A) including a repeating unit having a tertiary amino group; and a block chain (B) including a repeating unit represented by the following formula (I) (wherein R.sup.1 represents a hydrogen atom or a C1-C3 alkyl group, R.sup.2 and R.sup.3 each independently represent a hydrogen atom or a C1-C6 alkyl group, Q represents an oxygen-containing saturated hetero ring group optionally having an alkyl group as a substituent or a C2-C20 alkenyl group, and n represents an integer of 0 to 6), and has an amine value of 80 mgKOH/g or more and 250 mgKOH/g or less.