Conductive substrate bearing a elastomeric polyurethane coating containing a conductivity control agent

摘要

A member for electrically cooperating with a conductive support surface to attract charged toner particles from the surface towards the member is disclosed. The member comprises a conductive substrate capable of supporting a uniform bias potential thereon and at least one coating comprising a resilient elastomeric polyurethane. The polyurethane is formed by reacting: (a) a polyisocyanate prepolymer and (b) a hardening mixture comprising: (i) a polyol and, (ii) as a conductivity control agent in the form of a phosphonium tetrahaloferrate salt represented by the formula: <IMAGE>