| 摘要 |
Provided is a developing roller in which printing quality, in particular, one-dot level fine line printing quality is improved by securing a high resistance value and high surface potential on the surface layer. The elastic roller comprises successively on the outer periphery of a shaft 1 an elastic layer 2, an intermediate layer 3, and a surface layer 4. The surface layer 4 contains a urethane (meth)acrylate oligomer obtained by allowing polybutadiene polyol or hydrogenated polybutadiene polyol, polyisocyanate, and (meth)acrylate having a hydroxyl group to react. |
