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US 2014/0234767 A1Published application
Electrostatic charge image developing toner
AssigneeRicoh Company, Ltd.
InventorsJunichi AWAMURA, Tsuneyasu Nagatomo, Satoshi Kojima, Shingo Sakashita, Tomoki Murayama, Masaya Fukuda
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Abstract
Provided is an electrostatic charge image developing toner, including: toner base particles including a polyester resin as a binder resin; and an external additive on the surface of the toner base particles. The external additive includes silica. The silica is produced by sol-gel method, and is aspherical. The percentage of change in the specific surface area of the toner when it is stored under high-temperature, high-humidity conditions is from 25% to 45%.
Claims6
An electrostatic charge image developing toner, comprising:
- toner base particles that comprise a polyester resin as a binder resin;
- and
- an external additive on a surface of the toner base particles,
- wherein the external additive comprises silica,
- wherein the silica is produced by sol-gel method, and is aspherical, and
- wherein a percentage of change in specific surface area of the toner when it is stored under high-temperature, high-humidity conditions is from 25% to 45%.
3 more elements
Dependencies are inferred from the claim text.