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Developer-for-electrophotography-having-carrier-particles-toner-particles-and-electroconductive-fine-powders

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Developer for electrophotography having carrier particles, toner particles and electroconductive fine powders

Details

Inventors: Ushiyama, Hisayuki; Ochi, Hisayuki; Miyamae, Tatsuo; Wakamiya, Katsutoshi;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Kittle; John E.
Assistant Examiner: Goodrow; John L.
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto

An electrophotographic developer comprises magnetic particles coated with a low surface energy resin, toner particles and electroconductive fine powders. This developer can develop solid areas uniformly and does not form fog.

DETAILED DESCRIPTION What we claim is: 1.
An electrophotographic developer which comprises magnetic particles coated with a low surface energy resin, toner particles and electroconductive fine powders from 0.
001-1 micron selected from tin oxide and zinc oxide.
2.
An electrophotographic developer according to claim 1 in which the low surface energy resin has a surface tension of 15-30 dyne/cm.
3.
An electrophotographic developer according to claim 1 in which the low surface energy resin is fluoroplastics.
4.
An electrophotographic developer according to claim 3 in which the thickness of the fluoroplastics coating on the magnetic particles is 5-20 microns.
5.
An electrophotographic developer according to claim 1 in which the low surface energy resin is silicone resin.
6.
An electrophotographic developer according to claim 5 in which the thickness of the silicone resin coating on the magnetic particles is 0.
5-2 microns.
7.
An electrophotographic developer according to claim 1 in which the resistivity of the electroconductive fine powders is 0.
1-10.
sup.
5 ohm.
cm.
8.
An electrophotographic developer according to claim 1 in which the amount of the electroconductive fine powders is 1-10% base on the weight of the toner.

Description:
BACKGROUND OF THE INVENTION 1.
Field of the Invention This invention relates to a developer for a magnetic brush development in electrophotography.
2.
Description of the Prior Art According to electrophotographic processes, electrostatic latent images are produced on a photoconductive material by an electrostatic means and when a developer composed of toner particles and carrier particles is applied to the electrostatic latent images, toner particles separate from carrier particles to develop the electrostatic latent images.
Such developing method is disclosed, for example, in U.
S.
Pat.
No.
2,874,063 concerning a magnetic brush developing method.
In such developing method, toner particles are held on the surface of carrier particles whose particle size is larger than that of toner particles by electrostatic force

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