Patent ID: 6953421
Filing Date: 2005-10-11
Classification: C08L,G03G

Abstract:
1. An electrophotography roller, in which a conductive shaft is disposed along a center axis, a conductive elastic layer is provided concentrically around said conductive shaft, and a surface layer is formed concentrically over said conductive elastic layer: wherein the conductive elastic layer comprises a reaction product of a curable composition whose main components are (A) a polymer that contains at least one alkenyl group in its molecule, and in which the repeating units that make up the main chain consist mainly of oxyalkylene units, (B) a curing agent that contains at least two hydrosilyl groups in its molecule, represented by the following general chemical formula where 2≦m+n≦50, 2≦m, and 1≦n, (C) a hydrosilylation catalyst, and (D) a conductivity imparter; wherein the conductive elastic layer has a JIS A hardness of 30° or less, and the shear modulus of the conductive elastic layer, measured as the viscoelasticity at 0.1 Hz in an environment of 20° C. and 60% RH, is at least 4×10 wherein the main component of the surface layer is either a single resin selected from the group consisting of urethane resins, acrylic resins, silicone resins, and fluororesins, or a blend of these resins, and material of the surface layer has an elongation between 300% and 600%.