Magnetic carrier for electrophotographic developing agent
AssigneeMita Industrial Co., Ltd.
InventorsToyotsune Inoue, Naruo Yabe, Hiroshi Shimoyama, Takuya Kadota, Toshiro Okae
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Abstract
A two-component binder-type magnetic carrier for developing agent comprising a magnetic powder and a binder resin. The carrier particles contain dispersed therein a release agent of the type of a metal soap and have abrasive or collapsible surfaces. By using the developing agent which contains this carrier, the magnetic powder peels off the carrier particle surfaces maintaining a controlled particle diameter and amount. Therefore, the carrier particles possess fresh surfaces at all times, whereby the occurrence of spent toner is effectively prevented and the charging amount of the toner is stably maintained.
Claims6
A magnetic carrier for a magnetic developing agent comprising:
- binder resin particles in which a magnetic powder is dispersed in an amount of 200 to 1000 parts by weight per 100 parts by weight of the binder resin,
- wherein in said resin particles is dispersed a metal salt of a higher fatty acid, said higher fatty acid having 12 to 30 carbon atoms, said metal salt being present in an amount of 2 to 5 parts by weight per 100 parts by weight of the binder resin, and said resin particles having abrasive surfaces.
An electrophotographic method comprising:
- developing an electrostatic latent image formed on an amorphous silicon photosensitive material by a two-component magnetic developing agent which contains a toner and a magnetic carrier to form a toner image on said photosensitive material;
- transferring at least a part of said toner image to a copying paper;
- and
- removing toner remaining on said photosensitive material by a blade;
- wherein said magnetic carrier comprises:
- binder resin particles in which a magnetic powder is dispersed in an amount of 200 to 1000 parts by weight per 100 parts by weight of the binder resin,
- wherein in said resin particles is dispersed a metal salt of a higher fatty acid, said higher fatty acid having 12 to 30 carbon atoms, said metal salt being present in an amount of 2 to 5 parts by weight per 100 parts by weight of the binder resin, and said resin particles having abrasive surfaces.
Dependencies are inferred from the claim text.