Konica Corporation

Konishiroku Photo Industry Co., Ltd.

Sekisui Kagaku Kogyo Kabushiki

Mitutaka Arai

Satoru Ikeuchi

Yuki Okuyama

Akitoshi Matsubara

Tomoo Shiohara

Hideki Yuri

Yasuhiko Oyama

Disclosed are a toner for development of electrostatic image, comprising as the main component a resin obtained by allowing a polymer containing a polymer component with low molecular weight and a polymer component with high molecular weight, at least the polymer component with low molecular weight containing a carboxylic acid component, to react with a polyvalent metal compound, and a method of fixing a toner image employing the toner described above. According to the present invention, there can be provided a toner for development of electrostatic image which has more improved fixability without lowering the anti-off-set property already improved, and also which can be prepared with good reproducibility without causing gelation to occur although the metal compound may be formulated therein, and can be improved in fixability without making charging characteristics unstable and at the same time without bringing about lowering in anti-off-set property, and thus an excellent toner image can be fixed.

Toner for development of electrostatic image and method of fixing

There are disclosed a toner for development of an electrostatic image which comprises containing (a) a mixture of a lower molecular weight polymer component and a higher molecular weight polymer component, and said lower molecular polymer component is a resin obtained by reacting a polymer containing a carboxylic acid component with a polyvalent metal compound to form cross-linking through a metal atom and (b) offset preventive agent; and also an electrostatic latent image developer which comprises (A) toner particles mainly comprising a resin obtained by reacting a carboxy group existing in a polymer component with a polyvalent metal compound and (B) resin coated-carrier particles coated with a fluorine-containing resin on a surface of a magnetic particle or inorganic fine particles.

Toner for development of electrostatic image and electrostatic latent

Magnetic recording medium having a non-magnetic support carrying a magnetic layer, the layer comprising a ferromagnetic powder, a binder, and a Nitrogen containing compound, which is able to complex with Iron ions wherein the stability constant of the Nitrogen compound and Iron ions is at least 15.

Magnetic recording medium

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Hino, Japan

Mitutaka Arai