Abstract: Disclosed herein is a green pigment composition comprising (a) a green pigment comprising a mixture of fine particles of a halogen-free blue pigment and fine particles of a halogen-free yellow pigment and (b) a halogen-free pigment derivative. Since the green pigment composition of the present invention does not generate the harmful substances such as dioxin and PCB at the time of burning processing, it is environmentally friendly, sanitary, easily recycled, excellent in light resistance and heat resistance and has the hue of clearness.

Abstract: Disclosed herein is a green pigment composition comprising (a) a green pigment comprising a mixture of fine particles of a halogen-free blue pigment and fine particles of a halogen-free yellow pigment and (b) a halogen-free pigment derivative. Since the green pigment composition of the present invention does not generate the harmful substances such as dioxin and PCB at the time of burning processing, it is environmentally friendly, sanitary, easily recycled, excellent in light resistance and heat resistance and has the hue of clearness.

Abstract: There is provided an aqueous pigment dispersion for a light-shielding paper comprising a pigment component, an aqueous resin and water, wherein the pigment component contains 2 to 50% by weight of graphite in which at least 80% of the total number of particles thereof has the maximum diameter of 1 to 30 .mu.m, 2 to 60% by weight of a colored pigment, and 10 to 90% by weight of a white pigment, and each specific gravity of the colored pigment and the white pigment is 2.0 to 6.0 g/cm.sup.3. The pigment dispersion of the present invention can provide light-shielding properties by rendering coating onto a paper base material and also can provide a light-shielding paper which facilitates recycling and has a high quality when recycling of waste paper is effected.

Abstract: A process for the production of a copper phthalocyanine pigment composition from 70 to 99% by weight of a crude copper phthalocyanine and 30 to 1% by weight of a phthalocyanine derivative,the crude copper phthalocyanine being converted to a pigment without a large amount of energy and the treatment of exhaust water,the copper phthalocyanine pigment composition having excellent fluidity, tinting strength and stability with time when used in a coating composition or a printing ink,the copper phthalocyanine pigment composition showing almost no "strike-through" when used for gravure printing on low-quality paper,the process comprising dry milling the entirety of the crude copper phthalocyanine and the phthalocyanine derivative in an amount of 0.5 to 10% by weight of a final composition in the absence of a milling auxiliary until the content of an .alpha.

Abstract: An azo pigment suitable for use in gravure printing ink is produced by treating 100 parts by weight of a starting azo pigment with from 1 to 30 parts by weight of an amine, from 0.1 to 0.5 equivalent of a fatty acid and/or rosin or a derivative thereof, based on the amine, and from 0.5 to 50 parts by weight of a resin containing carboxyl groups and having an acid value of at least 50. The thus-produced azo pigment may be formulated in gravure printing ink, which exhibits improved gloss, flowability and aging discoloration characteristics. Such an ink practically does not penetrate through even when printed on cheap paper or uncoated paper.