Charging roller, and method of producing the same

Patent metadata

Field	Value
Publication number	US-10768545-B2
Application number	US-201815965043-A
Country	US
Kind code	B2
Filing date	Apr 27, 2018
Priority date	Jun 30, 2017
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

An inventive charging roller ( 1 ) includes a roller body ( 2 ) which is formed of a crosslinked product of a rubber composition containing a rubber component including 30 to 70 parts by mass of GECO, 15 to 60 parts by mass of IR and not less than 1 part by mass of SBR and/or NBR based on 100 parts by mass of the overall rubber component and has an outer peripheral surface ( 5 ) finished in a finish-polished surface. An inventive production method includes the steps of: forming a roller body ( 2 ) from the crosslinked product of the rubber composition described above; and wet-polishing or mirror-polishing an outer peripheral surface ( 5 ) of the roller body ( 2 ) into a finish-polished surface.

First claim

What is claimed is:

1. A charging roller comprising a roller body having an outer peripheral surface finished in a finish-polished surface,
wherein the roller body has a surface portion including the finish-polished surface, and at least the surface portion comprises a crosslinked product of a rubber composition containing a rubber component,
wherein the rubber component comprises, based on 100 parts by mass of the overall rubber component:
(1) not less than 30 parts by mass and not greater than 70 parts by mass of epichlorohydrin-ethylene oxide-allyl glycidyl ether terpolymer rubber;
(2) not less than 15 parts by mass and not greater than 60 parts by mass of isoprene rubber, wherein the isoprene rubber is a homopolymer; and
(3) not less than 1 part by mass of at least one selected from the group consisting of styrene butadiene rubber and acrylonitrile butadiene rubber.

2. The charging roller according to claim 1 , wherein the rubber component further comprises:
(4) at least one selected from the group consisting of butadiene rubber and chloroprene rubber.

3. The charging roller according to claim 2 , further comprising an oxide film provided in the outer peripheral surface.

4. The charging roller according to claim 1 , further comprising an oxide film provided in the outer peripheral surface.

5. A charging roller production method for producing a charging roller comprising a roller body, the method comprising the steps of:
forming at least a surface portion of the roller body from a crosslinked product of a rubber composition containing a rubber component; and
wet-polishing or mirror-polishing an outer peripheral surface of the roller body into a finish-polished surface;
wherein the rubber component comprises, based on 100 parts by mass of the overall rubber component:
(1) not less than 30 parts by mass and not greater than 70 parts by mass of epichlorohydrin-ethylene oxide-allyl glycidyl ether terpolymer rubber;
(2) not less than 15 parts by mass and not greater than 60 parts by mass of isoprene rubber, wherein the isoprene rubber is a homopolymer; and
(3) not less than 1 part by mass of at least one selected from the group consisting of styrene butadiene rubber and acrylonitrile butadiene rubber.

6. The charging roller production method according to claim 5 , wherein the rubber component further comprises:
(4) at least one selected from the group consisting of butadiene rubber and chloroprene rubber.

7. The charging roller production method according to claim 5 , further comprising the step of forming an oxide film in the outer peripheral surface by irradiating the outer peripheral surface with ultraviolet radiation.

Assignees

• Sumitomo Rubber Ind

Inventors

• Suzuki Daijiro

Classifications

• C08L9/06

  Copolymers with styrene · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08L9/02

  Copolymers with acrylonitrile · CPC title

• G03G15/0233 Primary

  Structure, details of the charging member, e.g. chemical composition, surface properties · CPC title