Electrically conductive rubber composition, transfer roller, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-10474068-B2
Application number	US-201815972826-A
Country	US
Kind code	B2
Filing date	May 7, 2018
Priority date	May 22, 2017
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

An inventive electrically conductive rubber composition contains: a rubber component including SBR and/or NBR, and 20 to 30 parts by mass of epichlorohydrin rubber based on 100 parts by mass of the overall rubber component; a crosslinking component; a foaming component; and a potassium salt of an anion having a fluoro group and a sulfonyl group in its molecule, the potassium salt being present in a proportion of not less than 0.01 part by mass and not greater than 1 part by mass based on 100 parts by mass of the overall rubber component. An inventive transfer roller ( 1 ) includes a roller body ( 2 ) formed from the electrically conductive rubber composition.

First claim

What is claimed is:

1. An electrically conductive rubber composition for a transfer roller comprising:
a rubber component;
a crosslinking component for crosslinking the rubber component;
a foaming component for foaming the rubber component; and
a potassium salt of an anion having a fluoro group and a sulfonyl group in its molecule;
wherein the rubber component includes epichlorohydrin rubber and at least one selected from the group consisting of styrene butadiene rubber and acrylonitrile butadiene rubber;
wherein the epichlorohydrin rubber is present in a proportion of not less than 20 parts by mass and not greater than 30 parts by mass based on 100 parts by mass of the overall rubber component;
wherein the potassium salt is potassium bis(trifluoromethanesulfonyl)imide;
wherein the potassium salt is present in a proportion of not less than 0.01 part by mass and not greater than 1 part by mass based on 100 parts by mass of the overall rubber component.

2. The electrically conductive rubber composition according to claim 1 ,
wherein the foaming component includes 4,4′-oxybis(benzenesulfonylhydrazide),
wherein 4,4′-oxybis(benzenesulfonylhydrazide) is present in a proportion of not less than 1 part by mass and not greater than 4 parts by mass based on 100 parts by mass of the overall rubber component.

3. The electrically conductive rubber composition according to claim 2 ,
wherein the rubber component further includes at least one selected from the group consisting of ethylene propylene diene rubber, chloroprene rubber and acryl rubber.

4. A transfer roller comprising a tubular roller body comprising a crosslinked and foamed product of the electrically conductive rubber composition according to claim 3 .

5. A transfer roller comprising a tubular roller body comprising a crosslinked and foamed product of the electrically conductive rubber composition according to claim 2 .

6. The electrically conductive rubber composition according to claim 1 ,
wherein the rubber component further includes at least one selected from the group consisting of ethylene propylene diene rubber, chloroprene rubber and acryl rubber.

7. A transfer roller comprising a tubular roller body comprising a crosslinked and foamed product of the electrically conductive rubber composition according to claim 6 .

8. A transfer roller comprising a tubular roller body comprising a crosslinked and foamed product of the electrically conductive rubber composition according to claim 1 .

9. An image forming apparatus comprising the transfer roller according to claim 8 .

10. The electrically conductive rubber composition according to claim 1 ,
wherein a proportion of the styrene butadiene rubber and/or the acrylonitrile butadiene rubber is not less than 70 parts by mass and not greater than 80 parts by mass based on 100 parts by mass of the overall rubber component.

Assignees

• Sumitomo Rubber Ind

Inventors

• Osaka Keisuke
• Tanio Yusuke

Classifications

• C08J9/0033 Primary

  containing sulfur · CPC title

• H01B1/122

  Ionic conductors · CPC title

• C08K13/02

  Organic and inorganic ingredients · CPC title

• G03G15/1685

  Structure, details of the transfer member, e.g. chemical composition · CPC title

• C08J9/0061

  characterized by the use of several polymeric components · CPC title