US 12,111,613 B2
Preparing method of electrostatic charge image developing toner and electrostatic charge image developing toner
Yuta Saeki, Kanagawa (JP); Atsushi Sugawara, Kanagawa (JP); Daisuke Noguchi, Kanagawa (JP); Kazuhiko Nakamura, Kanagawa (JP); and Hiroshi Nakazawa, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Jul. 13, 2021, as Appl. No. 17/373,915.
Claims priority of application No. 2021-047973 (JP), filed on Mar. 22, 2021.
Prior Publication US 2022/0299900 A1, Sep. 22, 2022
Int. Cl. G03G 9/08 (2006.01); G03G 9/087 (2006.01)
CPC G03G 9/0823 (2013.01) [G03G 9/087 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A preparing method of an electrostatic charge image developing toner, the method comprising:
aggregating at least binder resin particles and release agent particles contained in a dispersion to form aggregated particles;
heating and coalescing the aggregated particles to form coalesced particles; and
filtering and cleaning the coalesced particles to obtain toner particles, wherein before the aggregating or during the aggregating, a polymer dispersant is added to the dispersion in an amount of 0.01% by weight or more and 1.3% by weight or less with respect to a total weight of the obtained toner particles,
the polymer dispersant is added to the dispersion as an aqueous solution comprising 1% by weight to 40% by weight of the polymer dispersant,
the aqueous solution comprises 5% by weight or more and 40% by weight or less of the polymer dispersant, and
the polymer dispersant is at least one compound selected from the group consisting of a formalin condensate sulfonate, a salt of an α-olefin-maleic acid copolymer, and a salt of a styrene-maleic acid copolymer.