METHOD FOR MANUFACTURING TONER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGES

• Main Authors: YAMASHITA TAKAHIRO, FUJIWARA YOSHIMASA, NAKAMURA YUKIAKI
• Format: Patent
• Language: English; Japanese
• Published: 06.10.2023
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide a method for manufacturing a toner for developing electrostatic charge images that has high transfer efficiency, and with which color points are suppressed.SOLUTION: Provided is a method for manufacturing a toner for developing electrostatic charge images in which a step for coagulating at least resin particles in a dispersed liquid including the resin particles and forming coagulated particles, and a step for heating a coagulated particle dispersed liquid and fusing-unifying the coagulated particles in a fusion-unification vessel that includes a base having volatility and accommodates the coagulated particle dispersed liquid in which the coagulated particles are dispersed, satisfy at least one of conditions (1) to (3) below. (1): the total area rate of one or a plurality of openings present at the top of the fusion-unification vessel is 5 cm2/m3 or greater per unit amount of the coagulated particle dispersed liquid; (2): the coagulated particles are fused and unified while the inside of the fusion-unification vessel is evacuated to the range of (atmospheric pressure -0.5) kPa or below; (3): the coagulated particles are fused and unified while a gas is blown into the fusion-unification vessel at a rate of 5 L/(min-m3) or greater per unit amount of the coagulated particle dispersed liquid in the fusion-unification vessel.SELECTED DRAWING: Figure 1 【課題】転写効率が高く、色点が抑制される静電荷像現像用トナーの製造方法の製造方法を提供すること。【解決手段】樹脂粒子を含む分散液中で、少なくとも樹脂粒子を凝集させ、凝集粒子を形成する工程と、揮発性を有する塩基を含むと共に、凝集粒子が分散された凝集粒子分散液を収容した融合合一槽内で、凝集粒子分散液に対して加熱し、凝集粒子を融合合一する工程が、下記条件（１）～（３）の少なくとも一つの条件を満たす静電荷像現像用トナーの製造方法。（１）：融合合一槽の上部に有する一又は複数の開口部の合計の面積率が凝集粒子分散液の単位量当たり５ｃｍ２／ｍ３以上である（２）：融合合一槽内を（大気圧－０．５）ｋＰａ以下の範囲に減圧した状態で凝集粒子を融合合一する（３）：融合合一槽内の凝集粒子分散液の単位量当たり５Ｌ／（ｍｉｎ・ｍ３）以上の風量の気体を融合合一槽内に送風した状態で凝集粒子を融合合一する【選択図】図１