Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1976-10-15
1981-04-28
Hess, Bruce H.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
252 6254, 252 6255, 252511, 252512, 252514, 427222, 428407, 430110, 430111, G03G 908, G03G 914
Patent
active
042646987
ABSTRACT:
A developer for electrostatic photography consisting essentially of a dry blend of (A) substantially spherical fixing magneto-sensitive particles of a composition comprising a binder medium and a fine powder of a magnetic material dispersed in the binder medium, the substantially spherical particles (A) have on their surfaces fine convexities and concavities formed by spraying a dispersion of the composition into a drying atmosphere and have a particle size of 2 to 44 microns, and (B) flowability- and electric resistance-controlling fine particles having a volume resistivity not higher than 10.sup.12 .omega.-cm and a particle size not larger than 1/10 of the particle size of the substantially spherical particles (A). The fine particles (B) are distributed predominantly on the surface portion of said spherical particles (A). The mixing weight ratio of (A):(B) is in the range of from 1000:1 to 50:1.
REFERENCES:
patent: 3196032 (1965-07-01), Seymour
patent: 3345294 (1967-10-01), Cooper
patent: 3627682 (1971-12-01), Hall, Jr.
patent: 3639245 (1972-02-01), Nelson
patent: 3925219 (1975-12-01), Strong
patent: 4082681 (1978-04-01), Takayama et al.
Aizawa Tatsuo
Takayama Hiroshi
Hess Bruce H.
Mita Industrial Company Limited
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