| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative charge type black toner excellent in offset resistance in fixing, low-temperature fixability, sharp meltability, blocking resistance, charging characteristics, pulverizing property and carbon black dispersibility and capable of forming good developed images for a long period of time, by using a linear polyester resin prepared without using bisphenol A or a derivative thereof as an alcohol component and a specified carbon black. SOLUTION: In the negative charge type black toner containing a binder resin and the carbon black, the binder resin is the linear polyester resin which comprises an acid component consisting of (1) disproportionated rosin and (2) terephthalic acid and/or isophthalic acid and an alcohol component consisting of (3) a glycidyl ester of a tertiary fatty acid and (4) a 2-10C aliphatic diol, and has an acid value of 10-60 mgKOH/g and a hydroxyl value of≤20 mgKOH/g, and wherein a specific surface area of the carbon black by the BET method is 30-250 m<SP>2</SP>/g. COPYRIGHT: (C)2006,JPO&NCIPI
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