Patent ID: 7740778

Claim:
A method of producing a conductive belt composed of a base resin containing polybutylene naphthalate resin at not less than 50 mass % nor more than 100 mass % of a total mass of said base resin and carbon nano-fibers having a DBP oil absorption amount of not less than 150 ml/100 g in an amount of 1 to 3 mass % of the total mass of said conductive belt; said method comprising the steps of: forming a conductive master batch by mixing said carbon nano-fibers with a first resin for use in a master batch containing said polybutylene naphthalate resin, wherein said carbon nano-fibers are contained in said conductive master batch in an amount of 3 to 8 mass %; mixing said obtained conductive master batch and a second resin for blending use containing said polybutylene naphthalate resin and not containing said carbon nano-fibers, with each other in an unmelted state and at a mixing mass ratio of said conductive master batch to said second resin for blending use of 4:6 to 3:7 to form an obtained mixture; and melting by extrusion molding the obtained mixture to form the conductive belt, wherein said carbon nano-fibers are contained in said conductive master batch in an amount larger than said carbon nano-fibers are contained in said conductive belt.