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Dainippon Ink and Chemicals, Incorporated

Dainippon Ink Chemicals, Inc.

Yoshinori Shimane

Kinji Shinzo

Masanobu Nakamura

Ryozo Sugawara

Hiroyuki Terada

Satoshi Ogawa

Masahiko Kubo

Tadayuki Sawai

Toshiro Kogawara

Hideki Gambayashi

Katsuyuki Ogura

Hiroyuki Mariko

Norio Aoki

A toner for electrophotography comprises: a coloring agent and a binding resin comprising a polyester resin constituted of cyclohexanedimethanol as an essential polyol component, wherein the toner has, at 110&deg; C., a storage elastic modulus of 3&times;10 Pa or less and a loss elastic modulus of 6&times;10 Pa or less, and, at 150&deg; C., a storage elastic modulus of 1&times;10 Pa or more and a loss elastic modulus of 1&times;10 Pa or more.

Toner for electrophotography

Use of a polyester resin obtained by reacting a divalent or higher epoxy compound, a dibasic or higher polybasic acid compound selected from a polybasic acid and/or acid anhydride and/or lower alkyl ester thereof, and a divalent or higher polyvalent alcohol in a toner for electrostatic charge development containing at least a binder resin, a colorant, and a charge control agent can provide a toner for a non-magnetic single component development having excellent fixing properties, offset resistance and development durability.

Toner for non-magnetic single component development

An electrostatic image developer is provided which has superior fixation properties and anti-offset properties, exhibits stable charge behavior even during continuous printing, and has superior durability and permits a high-quality image to be obtained. This electrostatic image developer is a toner composition containing colored resin particles comprising at least a binder resin, a colorant, and a charge control agent, wherein (1) an epoxy compound with a valence of 5 or more, (2) a polybasic acid compound having a valence of 2 or more selected from the group consisting of polybasic acids and/or acid anhydrides and/or lower alkyl esters thereof, and (3) a polyvalent alcohol having a valence of 2 or more, are employed as chief structural components of the binder resin, and a polyester resin is produced by reacting components (1)-(3) simultaneously, or by first reacting components (1) and (3), and subsequently reacting component (2), or by first reacting components (1) and (2), and subsequently reacting component (3).

Toner composition and developer for electrostatic image development

Growing community of inventors

Ichikawa, Japan

Yoshinori Shimane