Oblon, McClelland, Maier & Neustadt, L.L.P.
Electrostatic image developing toner, developer, and image forming apparatus
A toner, including: base particles containing a polyester resin, a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd (THF insoluble matter)] of 30° C. or lower where the glass transition temperature [Tg2nd (THF insoluble to matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.
Ricoh Company, Ltd.
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Tsuyoshi Akihiro Ryuta Akinori Hideyuki Hiroyuki Shinsuke Kohsuke Hiroshi Suzuka Shinya Minoru
Sugimoto Takeyama Chiba Saitoh Santo Takeda Nagai Nagata Yamada Amemori Nakayama Masuda