Title:
METHOD FOR PRODUCING NEGATIVELY CHARGEABLE POLYMERIZED TONER
Document Type and Number:
WIPO Patent Application WO/2015/099092
Kind Code:
A1
Abstract:
Provided is a method for producing a negatively chargeable polymerized toner which has excellent thin line reproducibility and excellent balance between thermal storage stability and low-temperature fixability, while being reduced in the occurrence of fog. A method for producing a negatively chargeable polymerized toner, which comprises: a suspension step for obtaining a suspension, in which drops of a first-stage polymerizable monomer composition that contains at least a first-stage polymerizable monomer, a coloring agent and a charge control agent are dispersed, by suspending the first-stage polymerizable monomer composition in an aqueous dispersion medium containing a dispersion stabilizer; a first-stage polymerization step for performing suspension polymerization using the above-described suspension in the presence of a polymerization initiator; and a second-stage polymerization step for performing suspension polymerization by adding a second-stage polymerizable monomer satisfying formula (1) when the polymer conversion rate in the first-stage polymerization step reaches 5-95%. This method for producing a negatively chargeable polymerized toner is characterized in that: the charge control agent is obtained by copolymerizing a vinyl aromatic hydrocarbon, a (meth)acrylate and a sulfonic acid group-containing (meth)acrylamide; and the copolymerization ratio of the sulfonic acid group-containing (meth)acrylamide is 0.8-4.0% by mass.
Tg1 > Tg2 formula (1)
(In formula (1), Tg1 represents the glass transition temperature (°C) of a polymer that is obtained by polymerizing the first-stage polymerizable monomer; and Tg2 represents the glass transition temperature (°C) of a polymer that is obtained by polymerizing the second-stage polymerizable monomer.)
Inventors:
TAGUCHI HIROYUKI (JP)
Application Number:
PCT/JP2014/084418
Publication Date:
July 02, 2015
Filing Date:
December 25, 2014
Export Citation:
Assignee:
ZEON CORP (JP)
International Classes:
G03G9/097; G03G9/08; G03G9/087
Domestic Patent References:
| WO2006070870A1 | 2006-07-06 | |||
| WO1997001131A1 | 1997-01-09 |
Foreign References:
| JPH11184165A | 1999-07-09 | |||
| JP2004004506A | 2004-01-08 | |||
| JP2006064960A | 2006-03-09 | |||
| JPH11174732A | 1999-07-02 | |||
| JP2007065667A | 2007-03-15 | |||
| JP2010243759A | 2010-10-28 |
Attorney, Agent or Firm:
KISHIMOTO, Tatsuhito et al. (JP)
Kishimoto Expert (JP)
Kishimoto Expert (JP)
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