Patent ID: 7790343

Claim:
Toner particles comprising a binder resin and a plasticizer, wherein the binder resin is a polyester resin and the plasticizer is a crystalline polyester resin, wherein the binder resin and crystalline polyester resin are present as separate particles in the toner particles and are soluble in one another when heated above the melting temperature of the crystalline polyester resin, wherein a following relation is satisfied within a range of temperature not smaller than Tg and smaller than TL: Gr>Gl wherein Gr is a storage elastic modulus of the toner particles measured when the toner particles are heated in a temperature range T, Gl is a storage elastic modulus of the toner particles measured when toner particles are cooled in the temperature range T, wherein the temperature range T is a range from a temperature TL that is 10° C. lower than a temperature Tm that is a flow starting temperature of the toner particles, to a temperature Tg that is a glass transition temperature of the toner particles.