Patent ID: 8660472
Filing Date: 2014-02-25
Classification: G03G

Abstract:
1. A developing roller comprising: a mandrel; an elastic layer provided on an outer periphery of the mandrel; and a surface layer provided on an outer periphery of the elastic layer, wherein: the surface layer comprises carbon black, and a polyester-polyurethane resin, and wherein the polyester-polyurethane resin comprises the following structures A and B; A: a structure represented by the following chemical formula (b); and B: at least one structure selected from the group consisting of structures represented by the following chemical formulae (c) to (g): and the surface layer has a storage modulus E′ of 5 MPa or more and 20 MPa or less, the storage modulus being measured at a temperature of 0° C. and a frequency of 10 Hz.