TONER FOR ELECTROSTATIC LATENT IMAGE DEVELOPMENT AND PRODUCTION METHOD OF TONER FOR ELECTROSTATIC LATENT IMAGE DEVELOPMENT

• Main Author: TAKAORI YASUKO
• Format: Patent
• Language: English; Japanese
• Published: 07.12.2017
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To provide a toner for electrostatic latent image development excellent in charging stability and fixability.SOLUTION: The toner for electrostatic latent image development comprises a plurality of toner particles. The toner particle comprises at least a crystalline polyester resin and nigrosine. A content percentage Wof the crystalline polyester resin with respect to the mass of the toner particle, and a content percentage Wof the crystalline polyester resin included in an ethanol soluble content of the toner particle with respect to the mass of the toner particle satisfy expression (1) 0.0010≤100×W/W≤0.1000. A content percentage Cof the nigrosine with respect to the mass of the toner particle, and a content percentage Cof the nigrosine included in an ethanol soluble content of the toner particle with respect to the mass of the toner particle satisfy expression (2) 0.1000≤100×C/C≤10.0000. The content percentages W, W, Cand Csatisfy expression (3) 1.00≤(C/C)/(W/W)≤1000.00.SELECTED DRAWING: Figure 1 【課題】帯電安定性及び定着性に優れる静電潜像現像用トナーを提供する。【解決手段】静電潜像現像用トナーは、トナー粒子を複数含む。トナー粒子は、結晶性ポリエステル樹脂とニグロシンとを少なくとも含有する。トナー粒子の質量に対する結晶性ポリエステル樹脂の含有率Ｗ1と、トナー粒子の質量に対するトナー粒子のエタノール可溶分に含まれる結晶性ポリエステル樹脂の含有率Ｗ2とが、式（１）「０．００１０≦１００×Ｗ2／Ｗ1≦０．１０００」を満たす。トナー粒子の質量に対するニグロシンの含有率Ｃ1と、トナー粒子の質量に対するトナー粒子のエタノール可溶分に含まれるニグロシンの含有率Ｃ2とが、式（２）「０．１０００≦１００×Ｃ2／Ｃ1≦１０．００００」を満たす。含有率Ｗ1、Ｗ2、Ｃ1及びＣ2が、式（３）「１．００≦（Ｃ2／Ｃ1）／（Ｗ2／Ｗ1）≦１０００．００」を満たす。【選択図】図１