Back to results
US 5,288,577 AGranted
Dry-type developer
AssigneeRicoh Company, Ltd.
InventorsKimitoshi Yamaguchi, Yoichiro Watanabe
Life of this patent
Estimating the term…
Abstract
A dry type developer is composed of substantially spherical, electrically insulating toner particles which are free from electroconductive particles, and carrier particles, each carrier particle including a core particle and a resin layer coated on the surface of the core particle, with a resistivity in the range of 10.sup.8 to 10.sup.14 .OMEGA.cm under application of a DC voltage of 1000 volts.
Claims15
A dry type developer comprising:
- (a) substantially spherical, electrically insulating toner particles which are dyed polymer particles, free from electro-conductive particles, prepared by dyeing polymer particles with a dye by dispersing said polymer particles in an organic solvent in which said polymer particles are insoluble;
- and
- (b) carrier particles, each carrier particle comprising a core particle and a resin layer comprising an electroconductive material coated on the surface of said core particle, with a resistivity in the range of 10.sup.8 to 10.sup.14 .OMEGA.cm under the application of a DC voltage of 1000 volts.
Dependencies are inferred from the claim text.