Patent ID: 7820354

Claim:
A process for producing a toner comprising: melt-kneading raw materials comprising two or more kinds of polyesters to form a melt-kneaded product, heat-treating the melt-kneaded product to form a heat-treated product, pulverizing the heat-treated product to form a pulverized product, and classifying the pulverized product, wherein the two or more kinds of polyesters comprise at least one kind of an amorphous polyester; the heat-treating is carried out at a temperature t (° C.) and time h (hour) satisfying formulas (a) and (b), Tg 1 ≦t≦Tm− 10 (a) h≧ 100/( t− 30, with proviso that t> 30 (b) wherein Tg 1 is a glass transition temperature (° C.) of the melt-kneaded product before the heat-treating step; and Tm is the lowest softening point (° C.) of softening points of the two or more kinds of polyesters; and the amorphous polyester comprises two kinds of amorphous polyesters of which softening points are different by 10° C. or more, wherein a softening point of a low-softening point polyester is from 80° to 120° C., and a softening point of a high-softening point polyester is from 120° to 160° C.