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Patent Searching and Data


Title:
METHOD OF MANUFACTURING POSITIVE CHARGE TYPE TONER
Document Type and Number:
Japanese Patent JP2004198599
Kind Code:
A
Abstract:

To provide a new manufacturing method by which the occurrence of deformed particles is suppressed to the utmost and a nearly spherical positive charge type chemical toner having a sharp particle size distribution is manufactured, and to provide a new manufacturing method by which no emulsification loss is caused and a positive charge type chemical toner having the above properties is manufactured in a high yield.

The method of manufacturing a positive charge type toner comprise a step A of dissolving or dispersing a carboxylic polyester resin and a Nigrosine dye in an organic solvent to prepare a colored resin solution; a step B of forming fine particles of the colored resin solution in an aqueous medium by adding the aqueous medium to the colored resin solution in the presence of >1 to 3 equivalents of a basic compound based on the total amount of carboxyl groups in the polyester resin; a step C of forming agglomerates of the fine particles by sequentially adding a dispersion stabilizer and an electrolyte to the aqueous medium; a step D of removing the organic solvent in the agglomerates; and a step E of separating the agglomerates from the aqueous medium and drying these.


Inventors:
TAKAYANAGI HITOSHI
HIRABAYASHI KENICHI
ITO TAKAYUKI
Application Number:
JP2002365096A
Publication Date:
July 15, 2004
Filing Date:
December 17, 2002
Export Citation:
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Assignee:
DAINIPPON INK & CHEMICALS
International Classes:
G03G9/087; G03G9/097; (IPC1-7): G03G9/087; G03G9/097
Attorney, Agent or Firm:
Takahashi victory