Patent ID: 9658554
Date: 2017-05-23
CPC Classifications: G03G

Claim:
1. A method of producing a toner comprising a toner particle having a core-shell structure that has a core containing a resin and has a shell phase on a surface of the core, the shell phase being derived from a resin fine particle containing a resin A, and the resin A being a resin containing a segment derived from a crystalline polymer D, the method comprising the steps of: (i) preparing a dispersion in a container, the dispersion being a dispersion of a resin solution droplet dispersed in a dispersion medium, and the resin solution droplet containing the resin, the resin fine particle, and an organic solvent; and (ii) extracting the organic solvent contained in the resin solution droplet into the dispersion medium and removing the organic solvent from the dispersion medium, wherein: an amount of matter soluble in the organic solvent at a temperature of 35° C. is not more than 30.0 mass % of the resin A, and an amount of matter soluble in the organic solvent at a temperature of 35° C. is at least 90.0 mass % of the crystalline polymer D, a gauge pressure P the dispersion is maintained in the step (i) at a temperature higher than a temperature Ta (° C.), and the method further comprises the following step (iii) between the step (i) and the step (ii): (iii) cooling the dispersion to a temperature lower than the temperature Ta (° C.), (where the temperature Ta (° C.) is a temperature at which—when a crystalline polymer solution prepared by dissolving the crystalline polymer D in the organic solvent is dispersed in the dispersion medium in a container, the container is pressurized to the gauge pressure P 1 , and the crystalline polymer solution is cooled under the gauge pressure P 1 —the heat generation accompanying crystal precipitation of the crystalline polymer D contained in the crystalline polymer solution is first observed; in addition, the mixing mass ratio between the crystalline polymer D and the organic solvent is the same as the mixing mass ratio in the step (i) between the crystalline polymer D contained in the resin fine particle and the organic solvent).