MANUFACTURING METHOD OF BINDING RESIN

To provide a manufacturing method of a binding resin providing a toner excellent in all of low temperature fixability, roller detachability, and crushability, a binding resin, a toner for electrostatic charge imaging containing the binding resin.SOLUTION: [1] There is provided a manufacturing method of a binding resin including following process 1 and process 2, in which the binding resin contains 40% or more of a component with molecular weight of 10,000 or more in a molecular weight distribution measured by a gel permeation chromatography, and a peak top of the molecular weight distribution in a range of 7,500 to 10,000. Process 1: a process for mixing aromatic alcohol containing an alkylene oxide addition article of bisphenol A and fumaric acid. Process 2: a process for adding further carboxylic acid to the mixture obtained in the process 1 and mixing them till a softening point of the binding resin in a system becomes to be in a prescribed range. [2] There is provided a toner for electrostatic charge imaging containing the binding resin obtained by the manufacturing method described in [1].SELECTED DRAWING: Figure 1 【課題】本発明の一実施形態は、低温定着性、ローラー剥離性、及び粉砕性のすべてにおいて優れたトナーが得られる結着樹脂の製造方法、結着樹脂、当該結着樹脂を含む静電荷像現像用トナーに関する。【解決手段】〔１〕下記工程１及び工程２を含む結着樹脂の製造方法であって、結着樹脂は、ゲル浸透クロマトグラフィー法により測定される分子量分布において、分子量10,000以上の成分を40％以上含み、かつ、7,500以上10,000以下の範囲内に、分子量分布のピークトップを有する、結着樹脂の製造方法。工程1：ビスフェノールAのアルキレンオキシド付加物を含む芳香族アルコールと、フマル酸を混合する工程。工程2:工程１で得られた混合物に対して、カルボン酸を更に添加し、系内の結着樹脂の軟化点が、所定の範囲内になるまで混合する工程。〔２〕〔１〕に記載の製造方法により得られた結着樹脂を含む、静電荷像現像用トナー。【選択図】図１