Ricoh Company, Ltd.

Hideyuki Ueda

Masato Kobayashi

Osamu Uchinokura

Kumi Hasegawa

Masanori Rimoto

Satoru Miyamoto

Tohru Suganuma

Noboru Kuroda

Masahiro Kawamoto

Yoshihiro Suguro

Masakazu Nakada

Shohichi Sugimoto

Hiroaki Sugiyama

Kohji Kubota

Tamotsu Kajihara

Shoji Watanabe

Masayuki Kakimoto

Kohta Wakimoto

Yoshiyuki Okegawa

Tomoyuki Yamada

Yuuichi Kohyama

Fumio Nishide

Kenkoh Degura

Hirofumi Yamanaka

Ikuo Tasaki

Mamoru Kawaguchi

An external additive including titanium dioxide having a water-soluble component of at least 0.2% by weight and a fluorosilane compound, wherein the titanium dioxide is surface-reformed by the fluorosilane compound.

External additive, method of manufacturing same and toner

Disclosed is a milling and classifying apparatus, adapted to produce toner fine particles, comprising a collision mill, and an air classifier, wherein the collision mill comprises a jet nozzle room, a path, a collision plate, and a collision member mounted to a support of the collision plate at downstream of the collision plate, the air classifier comprises a dispersion room and a classification room, the classification room is disposed below the dispersion room, and a flow stabilizer is arranged at a central suction of the separator core to control swirl stream generated within the classification room so as to centrifuge the powder into coarse particles and fine particles by action of the swirl stream.

Milling and classifying apparatus, collision mill, air classifier, toner, and method for producing toner

A toner including toner particles including at least a binder resin having a first melting point and a first solubility parameter, a colorant and a particulate release agent having a second melting point lower than the first melting point and a second solubility parameter different from the first solubility parameter, wherein the particulate release agent dispersed in the toner particles has an average needle-shape degree LD/SD of not less than 1.6, where LD is a diameter of a particle of the release agent dispersed in the toner in a major axis direction thereof and SD is a diameter of the particle in a minor axis direction.

Electrophotographic toner and image forming method using the toner

Growing community of inventors

Numazu, Japan

Hideyuki Ueda