Semiconductive roller and production method therefor
AssigneeSumitomo Rubber Industries, Ltd.
InventorKei Tajima
Life of this patent
Estimating the term…
Abstract
A semiconductive roller (1) is produced by: preparing a rubber composition containing a rubber component including an NBR and an EPDM in a mass ratio of NBR/EPDM=70/30 to 30/70, at least one selected from the group consisting of SAF, ISAF and HAF, sulfur, a peroxide crosslinking agent and a sulfenamide accelerating agent; extruding the rubber composition into a tubular body; crosslinking the tubular body in a vulcanization can or with the use of a continuous crosslinking apparatus; and forming an oxide film (5) in an outer peripheral surface (4) of the tubular body by irradiation with ultraviolet radiation with a shaft (3) inserted through the tubular body.
Claims6
A semiconductive roller comprising:
- a tubular body formed by crosslinking a rubber composition;
- a shaft inserted through the tubular body;
- and
- an oxide film provided in an outer peripheral surface of the tubular body;
- the rubber composition comprising:
- a rubber component including only an acrylonitrile butadiene rubber (NBR) and an ethylene propylene diene rubber (EPDM) in a mass ratio of NBR/EPDM=70/30 to 30/70;
- a predetermined proportion of at least one carbon black selected from the group consisting of SAF, ISAF and HAF, the predetermined proportion being adjusted to be less than 50 parts by mass based on 100 parts by mass of the overall rubber component so that the semiconductive roller has a roller resistance of not less than 104Ω and not greater than 106.5Ω;
- and
- a crosslinking component including sulfur, a peroxide crosslinking agent and a sulfenamide accelerating agent for crosslinking the rubber component.
A semiconductive roller production method comprising the steps of:
- preparing a rubber composition comprising a rubber component including only an acrylonitrile butadiene rubber (NBR) and an ethylene propylene diene rubber (EPDM) in a mass ratio of NBR/EPDM=70/30 to 30/70, a predetermined proportion of at least one carbon black selected from the group consisting of SAF, ISAF and HAF, the predetermined proportion being adjusted to be less than 50 parts by mass based on 100 parts by mass of the overall rubber component so as to control roller resistance in a range of not less than 104Ω and not greater than 106.5Ω, and a crosslinking component including sulfur, a peroxide crosslinking agent and a sulfenamide accelerating agent for crosslinking the rubber component;
- extruding the rubber composition into a tubular body in an unvulcanized state;
- crosslinking the unvulcanized rubber composition extruded into the tubular body in a vulcanization can or with the use of a continuous crosslinking apparatus, and then inserting a shaft through the tubular body of the vulcanized rubber composition;
- and
- forming an oxide film in an outer peripheral surface of the tubular body of the rubber composition by irradiation of the outer peripheral surface with ultraviolet radiation with the shaft inserted through the tubular body.
Dependencies are inferred from the claim text.