Semiconductive roller

Patent metadata

Field	Value
Publication number	US-9840612-B2
Application number	US-201514609959-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Feb 14, 2014
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A semiconductive roller according to the present invention includes a crosslinked product containing just the three types of rubber of butadiene rubber, epichlorohydrin rubber, and chloroprene rubber as rubber components, has a non-porous, single-layer structure, and has a compression set Cs (%) of not more than 10% as measured in accordance with the measurement method described in the Japanese Industrial Standards JIS K6262:2006 under conditions of a test temperature of 70° C., a test time of 24 hours, and a compression ratio of 25%.

First claim

The invention claimed is:

1. A semiconductive roller comprising a crosslinked product containing just the three types of rubber of butadiene rubber, epichlorohydrin rubber, and chloroprene rubber as rubber components,
having a non-porous, single-layer structure, and
having a compression set Cs (%) of not more than 10% as measured in accordance with the measurement method described in the Japanese Industrial Standards JIS K6262:2006 under conditions of a test temperature of 70° C., a test time of 24 hours, and a compression ratio of 25%, wherein
a blending proportion of the butadiene rubber with respect to 100 parts by mass of the total amount of the rubber components is not less than 10 parts by mass and not more than 80 parts by mass,
a blending proportion of the epichlorohydrin rubber with respect to 100 parts by mass of the total amount of the rubber components is not less than 10 parts by mass and not more than 80 parts by mass, and
a blending proportion of the chloroprene rubber with respect to 100 parts by mass of the total amount of the rubber components is not less than 5 parts by mass and not more than 30 parts by mass.

2. The semiconductive roller according to claim 1 , wherein the butadiene rubber includes a high cis-butadiene rubber with a cis-1,4 bond percentage of not less than 90% by mass.

3. The semiconductive roller according to claim 1 , wherein the epichlorohydrin rubber includes at least one of either of ECO and GECO, and
the ethylene oxide content of the ECO and the GECO is not less than 30 mole % and not more than 95 mole %.

4. The semiconductive roller according to claim 2 , wherein the epichlorohydrin rubber includes at least one of either of ECO and GECO, and
the ethylene oxide content of the ECO and the GECO is not less than 30 mole % and not more than 95 mole %.

5. The semiconductive roller according to claim 1 , wherein the compression set Cs (%) is not more than 8%.

6. The semiconductive roller according to claim 1 , comprising an outer peripheral surface on which an oxide film is formed.

7. The semiconductive roller according to claim 1 that is used as a developing roller incorporated in an image forming apparatus using an electrophotographic method and arranged to develop an electrostatic latent image, formed on a surface of a photoreceptor, into a toner image by means of a charged toner.

Assignees

• Sumitomo Rubber Ind

Inventors

• Kuroda Kenichi

Classifications

• C08L71/03

  Polyepihalohydrins · CPC title

• C08L11/00 Primary

  Compositions of homopolymers or copolymers of chloroprene · CPC title

• C08L9/00

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

• G03G15/0818 Primary

  characterised by the structure of the donor member, e.g. surface properties · CPC title

• G03G15/0808

  characterised by the developer supplying means, e.g. structure of developer supply roller · CPC title