Conductive roller and image forming apparatus comprising the same

• US 20070037680A1
• Filed: 08/08/2006
• Published: 02/15/2007
• Est. Priority Date: 08/11/2005
• Status: Abandoned Application

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Tagawa, Hirotaka, Kawano, Kouta
• Application Number:
  US11/500,285
• Publication Number:
  US 20070037680A1
• Time in Patent Office: Days
• US Class Current: 492/56
• CPC Class Codes: G03G 15/0233 Structure, details of the charging member, e.g. chemical composition, surface properties
• CPC Class Codes: G03G 15/0818 characterised by the structure of the donor member, e.g. surface properties

Abstract

In a conductive roller comprising a metal shaft and an elastic layer formed thereon, the elastic layer contains a monovalent tetrafluoroborate.

Claims

1. A conductive roller comprising a metal shaft and an elastic layer formed on the outer periphery of the metal shaft and composed of a polyurethane foam or a polyurethane elastomer, characterized in that the elastic layer contains a monovalent tetrafluoroborate.

2. A conductive roller according to claim 1, wherein the monovalent tetrafluoroborate is at least one selected from the group consisting of lithium tetrafluoroborate, sodium tetrafluoroborate and potassium tetrafluoroborate.

3. A conductive roller according to claim 1, wherein the elastic layer is formed by a prepolymer process using a polyurethane raw material comprising 1-50 parts by mass of a polyol and 0.1-10 parts by mass of a monovalent tetrafluoroborate based on 100 parts by mass of an urethane prepolymer synthesized from a polyol and a polyisocyanate.

4. A conductive roller according to claim 1, wherein the elastic layer is formed by a one-shot process using a polyurethane raw material comprising 1-50 parts by mass of a polyisocyanate and 0.1-10 parts by mass of a monovalent tetrafluoroborate based on 100 parts by mass of a polyol.

5. A conductive roller according to claim 1, wherein the elastic layer is composed of a polyurethane foam obtained by foaming a polyurethane raw material with mechanical stirring.

6. An image forming apparatus comprising a conductive roller as claimed in any one of claims 1-5.

7. An image forming apparatus according to claim 6, wherein the conductive roller is used as at least one of a developing roller, a charging roller, a toner feed roller and a transfer roller.