| 摘要 |
<p>PURPOSE:To provide the developer in which an inorg. fine particle is hardly embedded in a colored grain by an mechanical action and with the change of the flowability and the charging characteristic of the toner powder with time reduced. CONSTITUTION:This developer is used in the color picture forming method including a multiplex transfer stage and consists of carrier grains having 20-60mum volume average diameter and toner grains formed by coating the colored grains contg. the binder resin and the colorant with a:n inorg. fine particles. The inorg. fine particles have a number rate maximum value in a number grain diameter distribution curve at grain diameter (x) in nm (where 20<=x<=50) and (y) in nm (where 3x<=y<=6x, and the number rate of particles is <=10% in (x+y)/2 grain diameter in nm. When the number of inorg. particles having <(x+y)/2nm diameter on the small grain diameter side is denoted by X% and that on the large grain diameter side by Y%, X/Y=0.5 to 2.0 and z/x=150 to 400, where (z) is the volume average diameter in nm.</p> |
