METHOD FOR MANUFACTURING TONER PARTICLES

• Main Authors: IKEDA NAOTAKA, SHIBAHARA SHOHEI, FUKUSHIMA GENYA, SHIOASHI YOSHIAKI, HASHIMOTO YASUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 12.04.2018
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To provide a method for manufacturing toner particles having a high aspect ratio and excellent developability and with which the generation of fine particles can be reduced.SOLUTION: A method for manufacturing toner particles includes: a preparation step of preparing an aqueous medium containing water-insoluble inorganic fine particles and polyvalent metal ions; a granulation step of adding a polymerizable monomer composition containing a polymerizable monomer and colorant to the aqueous medium to form particles of the polymerizable monomer composition in the aqueous medium; and a polymerization step of polymerizing the polymerizable monomer contained in the particles of the polymerizable monomer composition to generate toner particles. The content ratio of the polyvalent metal ions in the aqueous medium prepared in the preparation step is 4 mmoL/L or more and 120 mmoL/L or less; when the number average particle diameter of the water-insoluble inorganic fine particles is D1, D1 satisfies 50nm≤D1≤250nm.SELECTED DRAWING: None 【課題】微小粒子の発生を抑制するとともに、アスペクト比が高く現像性に優れるトナー粒子の製造方法を提供すること。【解決手段】難水溶性無機微粒子と多価金属イオンとを含有する水系媒体を調製する調製工程、該水系媒体に、重合性単量体と着色剤とを含有する重合性単量体組成物を加えて、該重合性単量体組成物の粒子を該水系媒体中で形成する造粒工程、および、該重合性単量体組成物の粒子に含有される該重合性単量体を重合させてトナー粒子を生成する重合工程を有するトナー粒子の製造方法であって、該調製工程において調製された水系媒体中の該多価金属イオンの含有割合が、４ｍｍｏＬ／Ｌ以上１２０ｍｍｏＬ／Ｌ以下であり、該難水溶性無機微粒子の個数平均粒径をＤ１としたとき、Ｄ１が、５０ｎｍ≦Ｄ１≦２５０ｎｍを満たすトナー粒子の製造方法。【選択図】なし