Process for producing aqueous pigment liquid dispersion and...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 17/00 (2006.01) B41J 2/01 (2006.01) B41M 5/00 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2659685

A process for highly efficiently producing an aqueous pigment dispersion containing an azo dye. The dispersion can retain a stable dispersion state over long and is suitable for use in inks for ink-jet recording. The process for aqueous pigment dispersion production comprises a liquefaction step in which a solid kneaded mixture obtained by mixing a solid kneaded mixture comprising one or more pigments (a) consisting mainly of an azo pigment, a styrene/acrylic acid copolymer (b), a basic compound (c), and a wetting agent (d1) with an aqueous medium is kneaded and water (e) and a wetting agent (d2) are added to the mixture being kneaded to thereby make the mixture liquid, the total amount of the wetting agent (d2) to be added in the liquefaction step being 0.5-40 mass% based on the solid kneaded mixture at the time of initiation of the liquefaction step.

La présente invention concerne un procédé de production hautement efficace d'une dispersion aqueuse de pigment contenant un colorant azoïque. La dispersion peut maintenir un état de dispersion stable sur une longue période et est appropriée pour une utilisation dans des encres pour impression par jet d'encre. Le procédé de production d'une dispersion aqueuse de pigment comprend une étape de liquéfaction dans laquelle un mélange malaxé solide obtenu en mélangeant un mélange malaxé solide comprenant un ou plusieurs pigments (a) constitués principalement d'un pigment azoïque, un copolymère de styrène et d'acide acrylique (b), un composé basique (c) et un agent mouillant (d1) avec un milieu aqueux est malaxé et de l'eau (e) et un agent mouillant (d2) sont ajoutés au mélange qui est malaxé de façon à rendre le mélange liquide, la quantité totale de l'agent mouillant (d2) à ajouter dans l'étape de liquéfaction étant de 0,5 à 40 % en masse sur la base du mélange malaxé solide au moment de l'initiation de l'étape de liquéfaction.

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