| 摘要 |
PROBLEM TO BE SOLVED: To improve glossiness of an image without causing complexity and an increase in size of an image forming apparatus, and without causing the occurrence of bleeding and displacement of the image.SOLUTION: Toner particles has a core-shell structure in which first resin particles containing a first resin is attached to or coated on the surface of second resin particles containing a second resin. The toner particles include, as colorant, nigrosine in the amount of 1 mass% or more and 20 mass% or less. The second resin satisfies the following formulas (1) and (2), wherein x represents the number average molecular weight of the second resin, and y represents the urethane group concentration (mass%) in the second resin. Formula (1): 0.00003x+2.03≤y≤-0.00003x+6.95; and formula (2): 10000≤x≤60000. |
