US 12,259,682 B2
Toner
Kozue Uratani, Shizuoka (JP); Kenta Kamikura, Kanagawa (JP); Kosuke Fukudome, Tokyo (JP); Tetsuya Kinumatsu, Shizuoka (JP); Takuya Mizuguchi, Shizuoka (JP); and Yuta Komiya, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 13, 2021, as Appl. No. 17/643,949.
Claims priority of application No. 2020-217550 (JP), filed on Dec. 25, 2020.
Prior Publication US 2022/0206402 A1, Jun. 30, 2022
Int. Cl. G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/097 (2006.01)
CPC G03G 9/08711 (2013.01) [G03G 9/0819 (2013.01); G03G 9/09733 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A toner, comprising:
a toner particle comprising a binder resin and an ester compound;
the binder resin comprising a styrene-acrylic-based resin and optionally comprising a low molecular weight polystyrene, the styrene-acrylic-based resin being a copolymer of monomers comprising (i) styrene, (ii) n-lauryl acrylate or n-lauryl methacrylate and (iii) crosslinking agent;
the styrene-acrylic-based resin containing a unit represented by formula (1) which is derived from the group (ii)

OG Complex Work Unit Chemistry
where R1 represents a hydrogen atom or a methyl group, and R2 represents a linear alkyl group having 12 carbon atoms; and
the ester compound comprising a structure represented by formulae (2) or (3)

OG Complex Work Unit Chemistry
where R3 represents an alkylene group having 2 to 4 carbon atoms, and R4 and R5 independently represent a linear alkyl group having 14 to 22 carbon atoms, wherein
a molar ratio of the unit represented by formula (1) to the ester compound is 0.5 to 1.5,
the styrene-acrylic-based resin is contained in the binder resin at 90.0% by mass or more,
an amount of the styrene for polymerizing the styrene-acrylic-based resin is 70.0 to 84.6% by mass with respect to the total mass of the monomers and the low molecular weight polystyrene, and
an amount of the crosslinking agent for polymerizing the styrene-acrylic-based resin is 0.5 to 1.5% by mass with respect to the total mass of the monomers and the low molecular weight polystyrene.