US 12,461,463 B2
Toner
Tomoya Nagaoka, Tokyo (JP); Takayuki Toyoda, Shizuoka (JP); Naoya Isono, Shizuoka (JP); Hirofumi Kyuushima, Tokyo (JP); and Masao Suzuki, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jun. 1, 2022, as Appl. No. 17/804,880.
Claims priority of application No. 2021-095997 (JP), filed on Jun. 8, 2021.
Prior Publication US 2022/0404730 A1, Dec. 22, 2022
Int. Cl. G03G 9/097 (2006.01); G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/093 (2006.01)
CPC G03G 9/09708 (2013.01) [G03G 9/0819 (2013.01); G03G 9/0827 (2013.01); G03G 9/08711 (2013.01); G03G 9/08755 (2013.01); G03G 9/09328 (2013.01); G03G 9/09364 (2013.01); G03G 9/09733 (2013.01)] 14 Claims
 
1. A toner, comprising:
a toner particle comprising a binder resin and a monohydric aliphatic alcohol having 8-18 carbon atoms;
the binder resin containing at least one resin selected from the group consisting of a styrene acrylic resin and a polyester resin, and containing no other resins; and
an external additive comprising at least one member selected from the group consisting of hydrotalcite particles and alumina particles, wherein
a content ratio of the monohydric aliphatic alcohol extracted from the toner with ethanol is 30 to 300 ppm by mass in the toner when measured according to the following protocol
(i) mixing 2 g of toner and 18 g of ethanol to produce a mixture,
(ii) irradiating the mixture with ultrasonic waves for 5 min,
(iii) allowing the mixture to stand in a thermostat at 60° C. for a whole day and night after irradiation with ultrasonic waves, and further allowing the mixture to stand at room temperature for three additional days,
(iv) filtering a supernatant of the mixture after standing through a PTFE syringe filter (pore size 250 nm) to obtain a filtrate, and
(v) analyzing the filtrate by gas chromatography to obtain the content ratio of the monohydric aliphatic alcohol extracted from the toner with ethanol.