| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polyurethane which excels in the property of carrying toner images, has follow-up properties to the irregularities of rough paper and the like and can prevent the belt from curling after being left to stand in the state wound on a pulley having a small diameter for a long rest, and an electrophotographic device obtained by using the polyurethane. <P>SOLUTION: The polyurethane has a peak temperature of the major dispersion of tan δ, obtained from the temperature dispersion of the kinematic viscoelasticity measured at a dynamic strain of 0.1% and a frequency of 10 Hz, of being present at 100-200°C, exists in the region of glass at 25°C, and has a transition of the storage modulus E' obtained under the same conditions in the range of -55 to -20°C. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
