| 摘要 |
There is provided a toner set including a yellow toner, a cyan toner and a magenta toner, the toners each comprising an external additive and colored resin particles comprising a binder resin, a colorant and a charge control agent. An absolute value of an average of q/d for any of the yellow, cyan and magenta toners is expressed by charge amount q (fC) and particle diameter d (μm). It is obtained by measurement using an electric field detachment-type charge amount distribution measurement device. It is in a range of 2.0 to 6.5 fC/10 μm, and a standard deviation (SD) of q/d is 13 fC/10 μm or less. A difference between average values of q/d for any two of the yellow, cyan and magenta toners is 2.0 fC/10 μm or less. A difference (ΔSD) between standard deviations of q/d for the two toners is 5.0 fC/10 μm or less. |
| 主权项 |
1. A toner set comprising a yellow toner, a cyan tonner and a magenta toner, the toners each comprising an external additive and colored resin particles comprising a binder resin, a colorant and a charge control agent,
wherein an absolute value of an average of q/d for any of the yellow, cyan and magenta toners which is expressed by charge amount q (fC) and particle diameter d (μm) and which is obtained by measurement using an electric field detachment-type charge amount distribution measurement device after the following frictional charge treatment, is in a range of 2.0 to 6.5 fC/10 μm, and a standard deviation (SD) of q/d for any of the yellow, cyan and magenta toners is 13 fC/10 μm or less, and wherein a difference (Δq/d) between average values of q/d for any two of the yellow, cyan and magenta toners is 2.0 fC/10 μm or less, and a difference (ΔSD) between standard deviations of q/d for the two toners is 5.0 fC/10 μm or less:[Frictional charge treatment]
first, 9.5 g of a non-coated Mn—Mg—Sr based ferrite carrier and 0.5 g of a toner to be measured are put in a 30 cc glass container (inner base diameter 31 mm, height 54 mm) and the glass container is rotated with a roller-type agitator at 150 rpm for 30 minutes to frictionally charge the toner in an environment at a temperature of 23° C. and a relative humidity of 50%. |
