AQUEOUS PIGMENT DISPERSION AND MANUFACTURING METHOD OF AQUEOUS PIGMENT DISPERSION

• Main Authors: UEDA YUTARO, SATO YOSHIHIRO, HAYAKAWA KOHEI, UCHIDA REI
• Format: Patent
• Language: English; Japanese
• Published: 10.06.2021
• Subjects: ADHESIVES; CHEMISTRY; DYES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES; PREPARATION OF CARBON BLACK; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES

To provide an aqueous pigment dispersion usable in manufacturing an inkjet ink, having smaller dispersion particle diameter and fewer coarse particles, with dispersion substances difficult to sediment, while excellent in dispersibility and storage stability.SOLUTION: An aqueous pigment dispersion includes: an orange pigment (A) with a primary particle diameter 70 nm or less, treated with a solvent salt milling in a presence of a quinacridone-based pigment derivative; a pigment dispersion resin (B) containing a radical polymer having an acid value of 80 to 160 mgKOH/g; and water (C).SELECTED DRAWING: None 【課題】本発明が解決しようとする課題は、分散粒子径が小さく及び粗大粒子数が少なく、分散物が沈降しにくく、かつ、分散性や保存安定性に優れたインクジェットインクの製造に使用可能な水性顔料分散体を提供することである。【解決手段】本発明は、キナクリドン系顔料誘導体の存在下でソルベントソルトミリング処理された一次粒子径７０ｎｍ以下のオレンジ顔料（Ａ）と、酸価８０〜１６０ｍｇＫＯＨ／ｇのラジカル重合体を含有する顔料分散樹脂（Ｂ）と、水（Ｃ）とを含有することを特徴とする水性顔料分散体に関するものである。【選択図】なし