Nicca Chemical Co., Ltd.

Tatsuhiro Hishida

Masaaki Hosoda

Yasumichi Moriyama

Koji Ogawa

Kazuo Tanabe

The invention provides an amorphous polyester resin that can sufficiently achieve the reciprocal performance properties of hot offset resistance and cold offset resistance, which is a major issue for a toner for electrostatic image development, while allowing adequate blocking resistance to be obtained, as well as a binder resin for toner for electrostatic image development, and an amorphous polyester resin production method, the amorphous polyester resin being obtained by reaction between a polybasic carboxylic acid compound and a polyhydric alcohol, wherein the polybasic carboxylic acid compound comprises (a) the reaction product between an aromatic polybasic carboxylic acid compound and a C2-4 glycol at 60 mol % or greater based on the total amount of the polybasic carboxylic acid compound, and the amorphous polyester resin has a glass transition point of 55&#xb0; C. to 75&#xb0; C. and a weight-average molecular weight of 10,000 to 50,000.

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Fukui, Japan

Tatsuhiro Hishida