TONER - CANON KK

Title:

TONER

Document Type and Number:

Japanese Patent JPS604950

Kind Code:

A

Abstract:

PURPOSE: To obtain a sharp image high in density and low in fog by adding a specified amt. of specified magnetic material.

CONSTITUTION: A magnetic material contained in an amt. of 0.001W2wt% in a toner has an average particle diameter of ≤200nm and a coercive force of ≥1,000Oe. To obtain ultrafine magnetic particles suitable for this invention, an aq. soln. of metal methoxide and metal acetonate is used as a starting material and hydrolyzed in 10W11 in pH, and the obtained ppt. is calcined at about 800°C. Embodiments of the ultrafine magnetic particles obtained by this method are barium hexaferrite and strontium hexaferrite. having 5,000W7,000Oe. A colorant is added when the toner is used as a magnetic color toner and the colorant is necessary.

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Inventors:

TAKENOUCHI MASANORI
KASAMA NOBUHIRO
HASEGAWA TETSUO

Application Number:

JP11396783A

Publication Date:

January 11, 1985

Filing Date:

June 23, 1983

Export Citation:

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Assignee:

CANON KK

International Classes:

G03G9/08; G03G9/083; G03G9/09; (IPC1-7): G03G9/08

Attorney, Agent or Firm:

Marushima Giichi

Next Patent: METHOD FOR CORRECTING COLOR SLIP OF MULTICOLOR COPYING MACHINE