TONER FOR ELECTROSTATIC-IMAGE DEVELOPMENT AND PROCESS FOR PRODUCING THE SAME

WIPO Patent Application WO/2009/157582

A1

A toner for electrostatic-image development, characterized by comprising toner base particles obtained by subjecting fine particles comprising a binder resin, a charge control agent, and a colorant to a thermal crosslinking treatment in a suspended state to thereby round the fine particles so as to result in an average roundness of 0.930-0.980.  The toner is further characterized in that the charge control agent comprises a product of the reaction of an aromatic hydroxycarboxylic acid or a salt thereof with a zirconium compound.  This toner for electrostatic-image development has improved unsusceptibility to hot offset during fixing and mitigates winding on the fixing device.  The toner has a satisfactory increase in charge amount and gives high-grade images having a high density and reduced in fogging even in a high-temperature high-humidity atmosphere.  When the toner is a color toner, a bright color is obtained.

AKIYAMA SATORU (JP)
UEDA MASASHI (JP)
SAITO KATSUTOSHI (JP)
TSUBOKURA MITSUO (JP)
TSUGUI TSUYOSHI (JP)
NAKAYAMA SHUZO (JP)
ASANO SHIGETOSHI (JP)

PCT/JP2009/061808

December 30, 2009

June 23, 2009

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IMEX CO LTD (JP)
AKIYAMA SATORU (JP)
UEDA MASASHI (JP)
SAITO KATSUTOSHI (JP)
TSUBOKURA MITSUO (JP)
TSUGUI TSUYOSHI (JP)
NAKAYAMA SHUZO (JP)
ASANO SHIGETOSHI (JP)

G03G9/087; G03G9/097

JP2002049182A	2002-02-15
JP2007140368A	2007-06-07
JP2004151438A	2004-05-27
JP3950573B2	2007-08-01

UCHIYAMA, Mitsuru (4-1 Kandasudacho 1-chome, Chiyoda-k, Tokyo 41, JP)

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