| abstract |
A method of producing a toner for developing electrostatic charge image, the method comprising: aggregating particles containing a crystalline polyester resin, particles containing a non-crystalline polyester resin and particles of a releasing agent in an aqueous medium, so as to form aggregated particles; and heating the aggregated particles to fuse into a coalescent body, wherein at least one of the crystalline polyester resin and the non-crystalline polyester resin is obtained by polymerization at temperatures not higher than 150° C. with a Bronsted acid containing a sulfur atom as a catalyst, and wherein a first onset temperature A(° C.) of the toner and a glass transition temperature B(° C.) of the non-crystalline polyester resin as measured by differential scanning calorimeter satisfy a relation (B−A)≦10, and wherein a weight average molecular weight of the crystalline polyester resin is ½ or lower of a weight average molecular weight of the non-crystalline polyester resin. |