Ricoh Company, Ltd.

Sanyo Chemical Industries, Ltd.

Kazuyuki Hirai

Hiroshi Yamada

Naohiro Watanabe

Shigeru Emoto

Ryota Inoue

Junichi Awamura

Toshiki Nanya

Masahide Yamada

Tsunemi Sugiyama

Naohito Shimota

Tomomi Suzuki

Akinori Saitoh

Masahiro Ohki

Shinichi Wakamatsu

Toshihiko Kinsho

Kazushige Yasumatsu

Hidetoshi Noda

Masataka Mitsumoto

To provide a toner containing an ethyl acetate-soluble polyester component and an ethyl acetate-insoluble polyester component, wherein the toner is granulated in an aqueous medium, the ethyl acetate-insoluble polyester component is obtained by elongating and/or cross-linking a modified polyester resin during granulating and/or after granulating, the modified polyester resin is produced by condensation polymerization of an acid component and at least one type of diol compound selected from aliphatic diol and alicyclic diol in the presence of a catalyst, and the mass average molecular weight of the modified polyester resin is 10,000 to 100,000.

Toner and developer, toner container, process cartridge, image forming apparatus, and image forming method using the same

The invention is a composite resin particle useful as an additive for paints or coatings, powder coatings, cosmetic additives, slush molding resins, spacer for electronic part assembly, standard particles for electric measurement devices, toner, hot melt adhesive as well as other molding materials. Said composite resin particle comprises a resin microparticle (A) depositing on the surface of a resin particle (B) wherein the shape factor (SF-1) of said composite resin particle is 115 to 800. It is also a composite resin particle comprising a resin microparticle (A) depositing on the surface of a resin particle (B) wherein the acid vale of a resin (b) constituting the resin particle (B) is 5 to 100.

Composite resin particle with specific shape factor

The present invention provides a method of producing an aqueous dispersion. A resin (b) or a solvent solution thereof, or a precursor (b0) of the resin (b) or a solvent solution thereof is dispersed in an aqueous dispersion of resin particles (A) composed of resin (a), and is caused the precursor (b0) to react where the precursor (b0) or a solvent solution thereof is used, to prepare resin particles (B) composed of said resin (b). Thereby, an aqueous dispersion (X1) of resin particles (C) having a structure such that the resin particle (A) adheres to the surface of the resin particle (B) is obtained.

Resin dispersions having uniform particle diameters, resin particles and processes for producing both

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Kyoto, Japan

Kazuyuki Hirai