Patent ID: 9057971
Filing Date: 2015-06-16
Classification: G03G

Abstract:
1. A toner comprising toner particles, each of which contains a binder resin and a colorant, wherein the toner particles have a core-shell structure in which a shell phase containing a resin B is formed on a surface of a core containing a binder resin A, a colorant, and a wax, the binder resin A contains a resin having a polyester segment capable of forming a crystalline structure, the resin B contains a resin having a polyester segment capable of forming a crystalline structure, and a content of the polyester segment capable of forming a crystalline structure in the binder resin A is 50.0% by mass or more and 90.0% by mass or less, wherein, in a rheological property measurement of the toner with a constant load extrusion-type capillary rheometer provided with a piston for applying a pressure to a sample and a die having a die orifice through which the sample is extruded, wherein the piston has a pressure-application surface area of 1.0 cm when a pressure of 5.0 MPa is applied to the sample with the piston, a temperature at which a displacement of the piston reaches 2.0 mm after 10 seconds from initiation of an application of the pressure is defined as T(5); when a pressure of 1.0 MPa is applied to the sample with the piston under heating at 70° C., a time over which a displacement of the piston reaches 2.0 mm from initiation of the pressure application is defined as t(1); and when a pressure of 5.0 MPa is applied to the sample with the piston under heating at 70° C., a time over which a displacement of the piston reaches 2.0 mm from initiation of the pressure application is defined as t(5), T(5) is 65.0° C. or more and 90.0° C. or less, t(1) is 60.0 seconds or more, t(5) is 30.0 seconds or less, and t(1)/t(5) is 4.5 or more and 10.0 or less.