| 摘要 |
PURPOSE: Provided are a toner binder for electrophotography to develop electrostatic charge images in electrophotography, electrostatic record, electrostatic printing and the like and a toner for electrophotography that can correspond to a high-speed copier and has high resolution and high image quality, and that is excellent in grindability. CONSTITUTION: The toner binder for electrophotography is characterized by that when its viscoelasticity is measured in the temperature range of 50 to 200 deg.C and at a heating rate of 2 deg.C/min., the viscoelasticity curve in the temperature range of 100 to 200 deg.C showing the relationship between the storage modulus and temperature, in which curve the axis of ordinate is the logarithm(Pa) of storage modulus G' and the axis of abscissa is temperature(deg.C), has a concave in the temperature range of 140 deg.C to 180 deg.C and has a minimum value of storage modulus G' at the bottom of the range, and this G' 0 and storage modulus G' 200 at 200 deg.C have a relationship of G' 0 < G' 200 and the difference delta G' (G' 200 - G' 0=delta G') is 300 Pa or more.
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