Method for producing toner
AssigneeCanon Kabushiki Kaisha
InventorsYoshitaka Suzumura, Yusuke Hasegawa, Tomohisa Sano, Yuujirou Nagashima, Kozue Uratani
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Abstract
Provided is a method for producing a toner, the method including a treatment process of treating a coloring particle including a binder resin, a colorant, a crystalline polyester, and a wax in an aqueous medium, wherein, the peak temperature of a crystallization peak (Pp) in the crystalline polyester is denoted by Tp (° C.) and the peak temperature of a crystallization peak (Pw) in the wax is denoted by Tw (° C.), the Tp and Tw satisfy a specific relationship, and the treatment process has a specific cooling step.
Claims6
A method for producing a toner comprising a toner particle including a binder resin, a colorant, a crystalline polyester, and a wax, wherein
- the crystalline polyester and the wax satisfy the following Formula (1),
- 45<Tp+5<Tw<100 Formula (1)
- where Tp (° C.) represents a peak temperature of a crystallization peak (Pp) in the crystalline polyester measured by differential scanning calorimetry (DSC), and
- Tw (° C.) represents a peak temperature of a crystallization peak (Pw) in the wax measured by differential scanning calorimetry (DSC),
- the method comprising the steps of:
- (i) setting a temperature of an aqueous medium in which a coloring particle is dispersed to at least the Tw, the coloring particle including the binder resin, the colorant, the crystalline polyester, and the wax;
- (ii) cooling the aqueous medium at a cooling rate of at least 5.0° C./min after the step (i) in a temperature range where an integral value relative to a total area of the Pw becomes at least 70%;
- and
- (iii) obtaining the toner particle by the following step (a) or (b):
- (a) holding the aqueous medium in a temperature range of the Pp for at least 30 min after the step (ii),
- (b) cooling the aqueous medium at a cooling rate of not more than 1.0° C./min after the step (ii) in a temperature range where an integral value relative to a total area of the Pp becomes at least 50%.
Dependencies are inferred from the claim text.