Back to results
US 12,461,463 B2Granted
Toner
AssigneeCanon Kabushiki Kaisha
InventorsTomoya Nagaoka, Takayuki Toyoda, Naoya Isono, Hirofumi Kyuushima, Masao Suzuki
Life of this patent
Estimating the term…
Abstract
A toner comprising a toner particle comprising a binder resin, and an external additive, wherein the toner particle further comprises a monohydric aliphatic alcohol, the monohydric aliphatic alcohol has 8 to 18 carbon atoms, a content ratio of the monohydric aliphatic alcohol extracted from the toner with ethanol is 30 to 300 ppm by mass in the toner, and the external additive comprises at least one selected from the group consisting of hydrotalcite particles and alumina particles.
Claims14
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.
7 more elements
Dependencies are inferred from the claim text.