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Patent Searching and Data


Title:
LIQUID DEVELOPER FOR ELECTROSTATIC PHOTOGRAPHY AND IMAGE FORMING METHOD USING THE SAME
Document Type and Number:
Japanese Patent JP3575061
Kind Code:
B2
Abstract:

PURPOSE: To obtain a positive charge type liquid developer having good electrostatic charge characteristics of toners and electrostatic stability in an actual machine and to obtain images having good image quality stably with lapse of time by dispersing positive charge type toner particles into carriers, thereby forming this developer.
CONSTITUTION: This liquid developer consists of the positive charge type toner particles formed of a thermoplastic resin which has a volume average grain size of ≥0.5 to ≤5μm and is substantially insoluble in the carriers at a developer temp. at the time of development, coloring agents and a positive charge control agent, the carriers 5 having high electric resistivity and a charge director included in the carriers 5. The positive charge type toner particles are dispersed in the carriers 5 by which the liquid developer is formed. The positive charge control agent selected from a group consisting of the quaternary ammonium salt expressed by formula I and the alkyl pyridinium salt expressed by formula II is used as the positive charge control agent. In the formula I, the formula II, R1 to R5 respectively denote 1 to 30C aliphat. group, arom. group, etc., and X denotes a halogen atom, CH3, etc.


Inventors:
Matsuoka, Hirotaka
Kobayashi, Takako
Hashimoto, Takeshi
Application Number:
JP1994000137823
Publication Date:
October 06, 2004
Filing Date:
May 30, 1994
Export Citation:
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Assignee:
FUJI XEROX CO LTD
International Classes:
G03G9/097; G03G9/12; G03G13/10; G03G15/10; (IPC1-7): G03G9/12; G03G13/10; G03G15/10
Domestic Patent References:
JP6149001A
JP5249750A
JP4186366A
JP7261467A
JP6208253A
JP6348066A
Attorney, Agent or Firm:
渡部 剛