Patent ID: 6060202
Filing Date: 2000-05-09
Classification: G03G

Abstract:
A toner for developing electrostatic images, comprising: toner particles comprising a binder resin and a colorant, and external additive particles;wherein the toner satisfies the particle size distribution conditions (i) and (ii) below,(i) a particle size distribution based on volume-basis and number-basis particle size distribution of particles having sizes in a range of 2.00-40.30 .mu.m as measured by a Coulter counter, including a weight-average particle size D4 of X .mu.m and Y % by number of particles having sizes of 2.00-3.17 .mu.m satisfying the following conditions (1) and (2):-5X+35.ltoreq.Y.ltoreq.-25X+180 (1)3.5.ltoreq.X.ltoreq.6.5 (2), and(ii) a particle size distribution of particles having circle-equivalent diameters in a range of 0.60 .mu.m-159.21 .mu.m as measured by a flow particle image analyzer, including A % by number of particles having circle-equivalent diameters of at least 1.00 .mu.m and below 1.03 .mu.m and B % by number of particles having circle-equivalent diameters of at least 2.00 .mu.m and below 2.06 .mu.m satisfying the following condition (3):B-A.ltoreq.0.30 (3).