Toner for developing electrostatic image, image forming method a

Details Toner for developing electrostatic image, image forming method a Toner for developing electrostatic image, image forming method a

1998-03-31

1999-09-07

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430111, 399252, G03G 908

Patent

active

059485825

ABSTRACT:
A toner for developing an electrostatic image is constituted by at least toner particles and an additive. The toner particles have a shape factor SF-1 of 100-160, a phase factor SF-2 of 100-140 and a weight-average particle size of 4-10 .mu.m as measured by a Coulter counter. The toner contains particles having circle-equivalent diameters in a range of 0.6-2.0 .mu.m and satisfying the following conditions (i)-(iii): (i) a first value C.sub.1 of 3-50% by number as measured by a flow particle image analyzer after application of a ultrasonic wave of 20 kHz for 5 min., (ii) a second value C.sub.2 of 2-40% by number as measured by the flow particle image analyzer after application of a ultrasonic wave of 20 kHz for 1 min., and (iii) a value C of 105-150 obtained according to the following equation: C=(C.sub.1 /C.sub.2).times.100 The toner is effective in improving image-forming characteristics in a continuous image formation on a large number of sheets.

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