Patent ID: 8841056

Claim:
A toner which comprises: toner particles, and an inorganic fine powder; wherein the toner particles are obtained by the following steps of: adding to an aqueous medium a polymerizable monomer composition containing at least: a polymerizable monomer, a colorant, and a polar resin comprising a polar resin-A, a polar resin-B, and a polar resin-C, granulating the polymerizable monomer composition in the aqueous medium to form particles of the polymerizable monomer composition, and polymerizing the polymerizable monomer contained in the particles of the polymerizable monomer composition; wherein, in displacement levels found in a micro-compression test in which a force is applied to one of the toner particles at a loading rate of 9.8×10 −6 N/sec to measure a displacement level (μm) at a point of time where the force has reached a maximum force of 4.90×10 −4 N, the displacement level at a measurement temperature of 25° C. is represented by X(25), the displacement level at a measurement temperature of 50° C. is represented by X(50), and the number average particle diameter of the toner is represented by D (μm), the X(25), the X(50) and the D satisfy the following relations (1) and (2): 0.10 ≦X (25)/ D≦ 0.35 (1), and 30≦[ X (50)− X (25)]/ X (25)×100≦150 (2), wherein, the acid value of the polar resin-A is represented by Av(A), the hydroxyl value of the polar resin-A is represented by OHv(A), the acid value of the polar resin-B is represented by Av(B), and the hydroxyl value of the polar resin-B is represented by OHv(B), the Av(A), the OHv(A), the Av(B), and the OHv(B) satisfy the following relation (3): Av ( A )+ OHv ( A )< Av ( B )+ OHv ( B ) (3), and wherein, the polar resin-C is a polymer or copolymer having a sulfonic acid group, a sulfonic salt group or a sulfonic ester group; and the polar resin-C has a glass transition point Tg (C) of from 70° C. to 90° C.; and the glass transition point Tg (A) of the polar resin-A, the glass transition point Tg (B) of the polar resin-B and the glass transition point Tg (C) satisfy the following relation (4): Tg ( B )≦ Tg ( C )< Tg ( A ) (4).