Title:
DEVELOPER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE
Document Type and Number:
Japanese Patent JP3486704
Kind Code:
B2
Abstract:
PURPOSE: To provide a two-component developer excellent in preservability over a long period of time, ensuring satisfactory flowability and image density and fit even for continuous copying repeated many times.
CONSTITUTION: This developer consists of a toner with fine particles stuck to the surface and a carrier, the fine particles include fine alumina particles and α value calculated by the expression α=[Tc/(100-Tc)](ρ2/ρ1)(r2/4r1) is 0.35-0.80. In the expression, Tc is the concn. (wt.%) of the toner, ρ1 is the true specific gravity of the toner, ρ2 is the true specific gravity of the carrier, r1 is the vol. average particle diameter (μm) of the toner and r2 is the vol. average particle diameter (μm) of the carrier.
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Inventors:
Hiroaki Matsuda
Application Number:
JP13863595A
Publication Date:
January 13, 2004
Filing Date:
May 12, 1995
Export Citation:
Assignee:
株式会社リコー
International Classes:
G03G9/08; G03G9/087; G03G9/10; (IPC1-7): G03G9/10; G03G9/08; G03G9/087
Domestic Patent References:
| JP6132858A | ||||
| JP6214422A | ||||
| JP6161142A | ||||
| JP659507A | ||||
| JP5341572A | ||||
| JP534984A | ||||
| JP4345169A |
Attorney, Agent or Firm:
Toshiaki Ikeura