DEVELOPING ROLLER, METHOD FOR ITS PRODUCTION, DEVELOPING ASSEMBLY AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a developing roller highly reliable as having controlled banding which is an image difficulty caused at the part of contact between a developing roller and a developer feed roller. SOLUTION: The developing roller has a surface layer which contains a urethane resin composed of a reaction product of an isocyanate with a group of specific alcohols 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. COPYRIGHT: (C)2007,JPO&INPIT