IMAGE FORMING METHOD AND TONER FOR DEVELOPING LATENT ELECTROSTATIC IMAGE

摘要

Disclosed is a developer containing toner and carrier, the toner containing as a binder resin a polyol resin having a plurality of OH groups in a molecule chain having an EX/OH ratio between epoxy groups (EX) and OH groups (OH) of 0.990 to 1.010. The rotational speed alpha, pitch beta and conveyance path length gamma of an stirring and conveying unit satisfies 1.0x10⁶<=alphaxbetaxgamma<=16.0x10⁶. Toner base particles having an electrostatic property satisfies 1.5<[Q^B/M₃₆₀₀]/[Q^B/M₁₈₀]<2.5, toner having an electrostatic property satisfies 0.7<[Q^T/M₃₆₀₀]/[Q^T/M₁₈₀]<1.3, the external additive comprises two types of fine inorganic particles having different resistance values, wherein the particle size distribution Y and added amount X of the fine inorganic particles with smaller resistance satisfy 0.1<=x<=2.0, and Y<=2.6x10^-3X+0.0048.