Electroconductive toner supply roller, method of preparing a supply roller, and electrophotographic imaging apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorTae-hyun Kim
Life of this patent
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Abstract
An electroconductive toner supply roller, a method of preparing the supply roller, and an electrophotographic imaging apparatus including the electroconductive toner supply roller are provided. More particularly, an electroconductive toner supply roller including a reactive conducting agent so as to prevent the formation of a sticky foam and migration of an ionic conducting agent. The electroconductive toner supply roller avoids the formation of a foam resulting from an increase of viscosity due to the addition of an electroconductor. An electrophotographic imaging apparatus is produced comprising the electroconductive toner supply roller.
Claims14
An electroconductive toner supply roller comprising a polyurethane foam member and a core bar, wherein the polyurethane foam member includes an electroconductive carbon black, a binder resin and a charge controlling agent.
A method of preparing an electroconductive toner supply roller, comprising:
- preparing a polyurethane foam member by adding additives including a catalyst, a blowing agent and an antifoaming agent to a compound having at least two active hydrogens and a compound having at least two isocyanate groups to form a reaction mixture, stirring and mixing said reaction mixture to expand and cure said reaction mixture to form the polyurethane foam;
- impregnating the polyurethane foam member with an impregnation solution containing an electroconductive carbon black, a binder resin and a charge controlling agent to attach the electroconductive carbon black, the binder resin and the charge controlling agent to cell walls of the polyurethane foam member;
- drying the polyurethane foam member;
- inserting a core bar into the polyurethane foam member and adhering the polyurethane foam member to the core bar;
- and
- polishing an outer surface of the polyurethane foam member.
A method of producing an electroconductive toner supply roller for use in an electrophotographic imaging apparatus, said method comprising:
- impregnating a polyurethane foam member with an electroconductive carbon black, a binder resin and a charge controlling agent, and
- attaching the polyurethane foam member to a core bar to form the electroconductive toner supply roller.
Dependencies are inferred from the claim text.