Patent ID: 7727134

Claim:
A developing roller which comprises: a shaft member; and an elastic layer which covers a peripheral surface thereof; said developing roller having a surface layer, wherein said surface layer comprises a urethane resin composed of a reaction product of the following component (a) with alcohols comprising the following components (b) to (d) or the following components (b) and (e), and has a surface having a contact angle to ethylene glycol of from 60.0 degrees or more to 90.0 degrees or less and a contact angle to diiodomethane of from 30.0 degrees or more to 38.0 degrees or less: (a) an isocyanate; (b) an alcohol containing a unit represented by the following formula (1); (c) an alcohol containing a unit represented by the following formula (2); (d) an alcohol containing a unit represented by the following formula (3); and (e) an alcohol containing a unit represented by the following formula (2) and a unit represented by the following formula (3): wherein 1 represents a positive integer; wherein m represents a positive integer; wherein n represents a positive integer.