| 摘要 |
The present invention is aimed at providing a toner binder for electrophotography that is excellent in the fixing property, offset resistance, blocking property, grindability, durable developing property and the like to correspond to the high-speed movement of a copier.The purpose of the present invention could be achieved by a toner binder having the following features for electrophotography. That is, when the viscoelasticity of the toner binder is measured in the temperature range of 50 to 200 ° C. and at a heating rate of 2° C./min., the viscoelasticity curve in the temperature range of 100 to 200° 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 (° C.), has a concave in the temperature range of 140 to 180° 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° C. are G' 0<G' 200 and the difference DELTAG' (G' 200-G' 0=DELTAG') is 300 Pa or more.
|
