Toner, and external additive for toner
A toner comprising: a toner particle containing a binder resin and a colorant; and an external additive, wherein the external additive is a composite particle having an organic substance and an organosilicon polymer coating layer on the surface of the organic substance, and when a curve for the variation (dE′/dT) in the storage elastic modulus E′ of the toner with respect to temperature T [° C.] is obtained on the basis of a curve of the temperature T—the storage elastic modulus E′ [Pa] of the toner, as determined by powder dynamic viscoelasticity measurements of the toner, the relative minimum value on the lowest temperature side between the onset temperature and 90° C. is −1.35×10 8 or less.
1. A toner comprising:
a toner particle containing a binder resin and a colorant; and
an external additive, wherein
the external additive is a core-shell type composite particle having:
a core containing a crystalline polyester resin; and
an organosilicon polymer-containing coating layer on the surface of the core,
a softening point of the toner particle is from 90° C. to 180° C., and
a softening point (Tm) of the crystalline polyester resin is from 50° C. to 105° C.
2. The toner according to claim 1 , wherein an acid value of the crystalline polyester resin is from 4 mg KOH/g to 20 mg KOH/g.
3. The toner according to claim 1 , wherein the crystalline polyester resin has a urethane bond.
4. The toner according to claim 1 , wherein a weight average molecular weight Mw of the crystalline polyester resin is 18,000 or more.