Aqueous pigment dispersion liquid and ink-jet recording ink

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 2624913

A production method of an aqueous pigment dispersion liquid of the present invention includes: a kneading step of kneading a mixture including (a) C. I. pigment violet 23, (b) a styrene-acrylic acid-based copolymer with an acid value of 50 to 300 mgKOH/g, (c) an alkali metal hydroxide, (d) water, and (e) a wetting agent, thereby producing a colored, kneaded material; and a dispersion step of dispersing the pigmented, kneaded material in an aqueous medium by using a dispersing machine with media, wherein the mass ratio of (b)/(a) in the kneading step is within a range of 0.15 to 0.45, the mass ratio of (d)/(a) in the first half of the kneading step is within a range of 0.04 to 0.42, and the change in viscosity of materials to be dispersed in the dispersion step is 10% or lower.

La présente invention concerne un procédé de production d'une dispersion aqueuse de pigment, comprenant l'étape de broyage consistant à broyer un mélange contenant (a) le pigment violet C.I. 23, (b) un copolymère de styrène et d'acide acrylique d'indice d'acidité allant de 50 à 300 mg de KOH/g, (c) un hydroxyde de métal alcalin, (d) de l'eau et (e) un agent mouillant de façon à obtenir de ce fait un produit broyé coloré, et l'étape de dispersion consistant à disperser le produit broyé coloré dans un milieu aqueux au moyen d'un dispositif de dispersion utilisant des milieux, dans l'étape de broyage, le rapport en masse composant (b)/component (a) étant dans la gamme de 0,15 à 0,45 tandis que dans la première moitié de l'étape de broyage, le rapport en masse composant (d)/component (a) étant dans la gamme de 0,04 à 0,42, et dans l'étape de dispersion, le changement de viscosité de la matière dispersée étant inférieur à 10 %.

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