Toner, method for producing the same, and developer

摘要

The present invention provides a toner containing base particles formed by emulsifying or dispersing, in an aqueous medium, a toner composition liquid which is obtained by dissolving or dispersing, in an organic solvent, at least a binder resin soluble in the organic solvent and a colorant masterbatch containing a colorant and a colorant dispersion resin, wherein the colorant dispersion resin is a resin having sparing solubility defined below: where the “sparing solubility” means that when 4 parts by mass of the colorant dispersion resin are added to and mixed with 10 parts by mass of the organic solvent, the mixture becomes white turbid at 25° C. or becomes a transparent solution once at 25° C. and then becomes white turbid within 12 hours.

主权项

1. A toner comprising:
base particles formed by emulsifying or dispersing, in an aqueous medium, a toner composition liquid which is obtained by dissolving or dispersing, in an organic solvent, at least a binder resin soluble in the organic solvent and a colorant masterbatch containing a colorant and a colorant dispersion resin having a weight average molecular weight (Mw) of 9,000 to 50,000, wherein the colorant contains an organic pigment selected from the group consisting of C.I. Pigment Red 269, C.I. Pigment Red 238, C.I. Pigment Red 146, C.I. Pigment Red 185, C.I.Pigment Yellow 93, C.I. Pigment Yellow 128, C.I. Pigment Yellow 180, C.I. Pigment Yellow 74, and C.I. Pigment Yellow 185, wherein the colorant dispersion resin is a resin having sparing solubility defined below: where the “sparing solubility” means that when 4 parts by mass of the colorant dispersion resin are added to and mixed with 10 parts by mass of the organic solvent, the mixture becomes white turbid at 25° C. or becomes a transparent solution once at 25° C. and then becomes white turbid within 12 hours, wherein the colorant dispersion resin is a polyester resin containing an amide bond structure, and wherein the colorant dispersion resin has a higher density than the binder resin.