Electrostatic image developing toner, developer, and image forming apparatus

摘要

A toner, including: base particles containing a polyester resin, a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd (THF insoluble matter)] of 30° C. or lower where the glass transition temperature [Tg2nd (THF insoluble to matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.

主权项

1. A toner, comprising:
base particles, comprising: a noncrystalline nonlinear polyester resin (A) having at least one of a urethane and a urea bond and a glass transition temperature (Tg) of from −60° C. to 0° C.; a noncrystalline polyester resin (B) having a Tg of from 40 to 80° C.; a crystalline polyester resin (C) having a melting point of from 60 to 80° C.; a colorant dispersing resin; a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein a tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd(THF insoluble matter)] of 30° C. or lower where the glass transition temperature [Tg2nd(THF insoluble matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.