Hodogaya Chemical Co., Ltd.

Motonori Tsuji

Masami Ito

Masaya Tojo

Tetsuya Yoshida

Masaki Okubo

Ikuo Kimura

Masafumi Asakai

Takeshi Yamamoto

Shuichi Hayashi

Makoto Nagaoka

Yoshikazu Aoki

Kanae Hiraishi

An organic electroluminescent device having a capping layer composed of material having a high refractive index that involves only small differences in refractive indices measured in the blue, green, and red wavelength regions, excelling in thin film stability and durability and having no absorption in the respective wavelength ranges of blue, green, and red is provided to improve device characteristics of the organic electroluminescent device, particularly to greatly improve the coupling-out efficiency. The organic electroluminescent device includes at least an anode, a hole transport layer, a light emitting layer, an electron transport layer, a cathode, and a capping layer in this order, wherein the capping layer contains a phthalic acid derivative represented by the following general formula 

Organic electroluminescent device

To provide a charge control agent and a toner having a superior charging characteristic. A charge control agent containing a bis-phthalimide derivative represented by formula. Thus, it is possible to provide a safe, negative chargeability charge control agent with which the rate of rise of the charge can be increased, and which has a high charging amount and poses no problem in terms of waste regulations. Furthermore, it is possible to provide a negatively chargeable toner (and particularly, a negatively chargeable polymerized toner) for electrostatic image development which uses this charging control agent and has a superior charging characteristic.

Charge control agent and toner using same

The present invention provides a toner that includes a charge control agent containing one or two or more resorcin derivatives represented by the following formula (1), a colorant, and a binder resin. 

Toner, developer, and toner cartridge

The present invention provides a charge control agent containing, as an active substance(s), one or two or more thiazolidinedione derivatives represented by the following formula (1), where Rrepresents a hydrogen atom, etc.; Rrepresents a hydrogen atom, a linear or branched alkyl group having 1 to 8 carbon atoms which may have a substituent, etc.; Rto R, which may be identical to or different from each other, represent a hydrogen atom, a chlorine atom, a linear or branched alkyl group having 1 to 8 carbon atoms which may have a substituent, etc., and may be joined to each other to form a ring; and V, W, X, Y and Z represent a carbon atom or a nitrogen atom, and 0 to 3 of any of V, W, X, Y and Z are nitrogen atoms which do not have the substituents of Rto R.

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Tsukuba, Japan

Motonori Tsuji