Konishiroku Photo Industry Co., Ltd.

Japan Synthetic Rubber Co., Ltd.

Minoru Tsuneyoshi

Makoto Tomono

Takahira Kasuya

Goichi Yamakawa

Hideaki Morita

Isao Furuta

An electrostatic image developing toner comprises a binder resin which contains at least 60% by weight of a styrene-butadiene copolymer. The copolymer contains a component A having a molecular weight of at least 100,000 in an amount of at least 20% by weight relative to the binder resin, and a component B having a molecular weight of at least 500,000 in the component A is not more than 15% by weight relative to the binder resin. The toner has adequate flowability and noncoagulation property and is capable of forming a superior visible image in a contact heat fixing system.

Electrostatic image forming toner

A toner for developing an electrostatic latent image comprising a resin prepared by emulsion polymerization of a first polymer to yield a first emulsion, emulsion polymerization of a second polymer to yield a second emulsion, mixing said first and second emulsions and coagulating said mixture, wherein said second polymer has characteristics different from those of said first polymer.

Toner for developing of electrostatic latent image

Growing community of inventors

Yokkaichi, Japan

Minoru Tsuneyoshi