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US 5,665,507 AGranted
Resin-coated carrier for electrophotographic developer
AssigneeFuji Xerox Co., Ltd.
InventorsMasahiro Takagi, Masahito Shinoki, Takayoshi Aoki
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Abstract
A magnetic particle brush developing carrier used for electrostatic latent image developing is disclosed, comprising a magnetic particle having a surface coating comprising two kinds of fluoro-type resins, with one of the resins having a higher critical surface tension than the other. The carrier maintains its triboelectric properties even after extended use, it reaches charge saturation after a short period of triboelectrification, and it has excellent charge stability against environmental change.
Claims3
A carrier for an electrophotographic developer, comprising:
- (a) a particle composed of a magnetic material;
- (b) a first fluoro resin coating adhered to only a portion of the particle surface and forming a reticular coating thereon;
- and
- (c) a second fluoro resin coating adhered to the particle surface on a portion other than the portion on which the first fluoro resin is adhered wherein the first and second fluoro resin coatings do not overlap each other;
- wherein the critical surface tension of the second fluoro resin is more than 5 dynes/cm greater than the critical surface tension of the first fluoro resin;
- said first fluoro resin coating consisting essentially of a vinylidenefluoride-trifluoroethylene copolymer, a vinylidenefluoride-tetrafluoroethylene copolymer, or a vinylidenefluoride-hexafluoropropylene copolymer;
- and
- said second fluoro resin coating consisting essentially of a tetrafluoroethylene-vinyl ether copolymer, a monochlorotrifluoroethylene-vinyl chloride copolymer, or an ethylene-tetrafluoroethylene copolymer.
5 more elements
Dependencies are inferred from the claim text.