Mitsubishi Chemical Corporation

Tomoko Nakagawa

Masaya Ota

Yuki Narukawa

Masaaki Okamoto

Masayuki Hiroi

Hiroaki Takamura

Yuka Nagao

Tadashi Mizushima

Tetsuharu Yuge

Masami Tsurumori

Akihiko Yanagibori

Kumiko Kameya

Shunichirou Kurihara

Tooru Uenaka

The present invention relates to an electrostatic charge image developing toner having a ratio of TP2/TP1 of 1.47 to 2.35, wherein a first measurement value of a tan &#x3b4; maximal value measured in 40&#xb0; C. to 80&#xb0; C. by a rheometer is set as the TP1, and a second measurement value of a tan &#x3b4; maximal value measured in 40&#xb0; C. to 80&#xb0; C. by the rheometer is set as the TP2.

Electrostatic charge image developing toner

The present invention relates to an electrostatic charge image developing toner, wherein when a tan &#x3b4; measurement is performed twice by a rheometer, in the first measurement, a tan &#x3b4; value measured at 130&#xb0; C. is set as TP(130&#xb0; C.), and a tan &#x3b4; value measured at 140&#xb0; C. is set as TP(140&#xb0; C.), in the second measurement, a tan &#x3b4; value measured at 140&#xb0; C. is set as TP(140&#xb0; C.), TP(140&#xb0; C.)/TP(140&#xb0; C.) is equal to or smaller than 0.95, and TP(130&#xb0; C.) is equal to or greater than 2.5.

The present invention relates to an electrostatic charge image developing toner having a ratio of TP/TPof 1.47 to 2.35, wherein a first measurement value of a tan &#x3b4; maximal value measured in 40&#xb0; C. to 80&#xb0; C. by a rheometer is set as the TP, and a second measurement value of a tan &#x3b4; maximal value measured in 40&#xb0; C. to 80&#xb0; C. by the rheometer is set as the TP

The object of the present invention is to provide an electrostatic image developing toner excellent in providing high image quality and excellent in low-temperature fixation performance and environmental stability. The present invention is an electrostatic image developing toner having a toner base particle containing at least a binder resin and a colorant, and an external additive, wherein the toner base particle has a core-shell structure having a core particle and a shell layer, the toner base particle has a resin coating layer of a water-soluble resin on the surface of the core particle, and has the shell layer on the resin coating layer.

Electrostatic image developing toner

To realize an electrophotographic photoreceptor excellent in abrasion resistance, the photosensitive layer of the photoreceptor comprises a polyester resin containing a repeating structural unit represented by the formula (1) and a hydrazone compound. (In the formula (1), Arto Areach represents, independently of each other, an arylene group which may have a substituent. Xrepresents a bivalent group (including a single bond) and Xrepresents a bivalent group (including a single bond) with 3 or less atoms.)

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Niigata, Japan

Tomoko Nakagawa