Process for producing toner for developing electrostatic image a

Details Process for producing toner for developing electrostatic image a Process for producing toner for developing electrostatic image a

1991-03-27

1992-05-12

Rosenbaum, Mark

Solid material comminution or disintegration

Processes

By utilizing kinetic energy of projected or suspended material

241 19, 241 24, 241 34, 241 39, 241 791, 241 80, B02C 1912

Patent

active

051119986

ABSTRACT:
A toner for developing an electrostatic latent image is produced by classifying a pulverized feed material in a first classifying means into coarse powder and fine powder; pulverizing the coarse powder and feeding back the pulverized product to the first classifying means; introducing the fine powder to a second classifying means having a multi-division classification zone divided into at least three sections, where it is classified into a coarse powder portion, a median powder portion, and a fine powder portion; and feeding back the coarse powder to said pulverizing means or first classifying means. The median powder has a volume average particle diameter of from 4 .mu.m to 10 .mu.m and a coefficient of variation of number distribution, represented by A, satisfying the following condition: 20.ltoreq.A.ltoreq.45, and the weights B, C, F, G and M are controlled to satisfy the expressions: 0.3 .ltoreq.weight B/weight C.ltoreq.0.8, 0.2.ltoreq.weight G/weight C.ltoreq.0.7 and 0.8.ltoreq.weight B/(weight F+weight M).ltoreq.1.2.

REFERENCES:
patent: 1897195 (1933-02-01), Howden
patent: 3877647 (1975-04-01), Gorobets et al.
patent: 4153541 (1979-05-01), Rumpf et al.
patent: 4221655 (1980-09-01), Nakayama et al.
patent: 4784333 (1988-11-01), Hikake et al.
patent: 4844349 (1989-07-01), Kanda et al.
patent: 4989794 (1991-02-01), Askew et al.
patent: 5016823 (1991-05-01), Kato et al.
Ueda et al., "Dry Classifier With Collecting Chamber", Nagoya Industrial Science and Technology Lab. Reports, 8 [4], 235, 1959.
"Iitani's Classifier", Journal J.S.M.E., 59, [3], 215, 1956.
Patent Abstracts of Japan, vol. 12, No. 345 (p. 759) [3192], Sep. 16, 1988.
Patent Abstracts of Japan, vol. 13, No. 314 (p. 899)[3662], Jul. 18, 1989.

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