Title:
METHOD FOR MANUFACTURING NEGATIVELY CHARGEABLE TONER AND NEGATIVELY CHARGEABLE TONER
Document Type and Number:
WIPO Patent Application WO/2016/158288
Kind Code:
A1
Abstract:
Provided is a method for efficiently manufacturing negatively chargeable toner in which carbon black, which serves as a colorant, is well dispersed, that has a high chargeability, that exhibits a superior transfer efficiency, that does not result in the occurrence of voids, and that provides an image having a sufficient image density. The present invention provides a method for manufacturing negatively chargeable toner, the method including: a suspending step for suspending a polymerizable monomer composition containing at least a polymerizable monomer, carbon black, a softener, and a charge control agent in an aqueous dispersion medium containing a dispersion stabilizer, thereby obtaining a suspension in which droplets of the polymerizable monomer composition are dispersed; and a step for obtaining colored resin particles by conducting suspension polymerization with the suspension under the presence of a polymerization initiator, the method being characterized in that the polymerizable monomer composition is prepared by mixing together a polymerizable monomer, carbon black, a softener, an aluminum coupling agent, and a charge control agent, the charge control agent being a sulfonic acid group-containing copolymer obtained by copolymerization of a vinyl aromatic hydrocarbon, a (meth)acrylate, and a sulfonic acid group-containing (meth)acrylamide and having a copolymerization content of the monomeric units of the sulfonic acid group-containing (meth)acrylamide in the copolymer in a range of 0.8 to 4.0 mass%.
Inventors:
WATANABE MASASHI (JP)
Application Number:
PCT/JP2016/057557
Publication Date:
October 06, 2016
Filing Date:
March 10, 2016
Export Citation:
Assignee:
ZEON CORP (JP)
International Classes:
G03G9/097; G03G9/08; G03G9/087; G03G9/09
Foreign References:
| JPH0315858A | 1991-01-24 | |||
| JPH11184165A | 1999-07-09 | |||
| JPS6461762A | 1989-03-08 | |||
| JPS63210852A | 1988-09-01 |
Attorney, Agent or Firm:
KISHIMOTO, Tatsuhito et al. (JP)
Kishimoto Expert (JP)
Kishimoto Expert (JP)
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