CONDUCTIVE ELASTIC ROLLER AND IMAGE-FORMING APPARATUS EMPLOYING THE SAME

摘要

A conductive elastic roller (1) which comprises a shaft member (2) and an elastic layer (3) consisting of one or more layers and disposed on the radial outer surface of the shaft member (2), wherein at least one layer of the elastic layer (3) comprises an ultraviolet-cured resin obtained by curing raw materials for elastic-layer formation comprising a urethane acrylate oligomer (A), a photopolymerization initiator (B), and a conductive agent (C) by irradiation with ultraviolet. The urethane acrylate oligomer (A) is a urethane acrylate oligomer synthesized either using as the only polyol a polyether polyol (a1) which is obtained by the addition polymerization of propylene oxide with a polyhydric alcohol and in which the proportion of primary hydroxy groups in the hydroxy groups located at molecular ends is 40% or higher or using the polyether polyol (a1) and other polyol(s) (a2). The elastic layer of this conductive elastic roller (1) has a low hardness and a low compressive residual set and less contaminates adjacent members including a photoreceptor.