| 摘要 |
A rubber roller, for use in an image-forming apparatus, which is formed by molding a rubber composition into the shape of a roller. In the rubber roller, a complex elastic modulus E* of rubber and a surface roughness Rz of the rubber roller satisfy a relationship indicated by an equation (1) shown below; and a hardness change of the rubber is set to not more than five points when the rubber ages at 70° C. for eight days: <?in-line-formulae description="In-line Formulae" end="lead"?>7xLn E*-0.12xRz+3.0<=10 . Equation (1)<?in-line-formulae description="In-line Formulae" end="tail"?>
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