Title:
TONER PARTICLE AND ELECTROPHOTOGRAPHIC NEGATIVE CHARGE CYAN TONER CONTAINING THAT TONER PARTICLE
Document Type and Number:
Japanese Patent JP2939455
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a cyan toner for color electrophotography having excellent electrification characteristics and moisture resistance which can form a sharp image by incorporating a copper phthalocyanine pigment having a specified content of free copper and at least a binder resin.
SOLUTION: The toner particles used contain a copper phthalocyanine pigment having ≤2000 ppm content of free copper and at least a binder resin. Namely, since free copper remaining as an impurity in the copper phthalocyanine pigment is positively charged, by decreasing the free copper above described present in the pigment, the pigment, the toner particles containing that pigment, and the toner can be electrified into negative charges in a good state. If the content of free copper in the copper phthalocyanine pigment is larger than 2000 ppm, the electrification property of the toner decreases in a high humidity environment, which causes image defects such as fog. In this method, as to the binder resin to be used, various kinds of resin materials such as well-known styrene-acryl and polyester resin can be used.
Inventors:
ONOCHI YOSHUKI
MAKI HITOSHI
NAMATAME YOSHASU
MAKI HITOSHI
NAMATAME YOSHASU
Application Number:
JP15820197A
Publication Date:
August 25, 1999
Filing Date:
June 16, 1997
Export Citation:
Assignee:
TOYO INKI SEIZO KK
International Classes:
G03G9/097; G03G9/08; G03G9/09; (IPC1-7): G03G9/09; G03G9/08; G03G9/097
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