# US 11,029,621 B2 · Conductive roll for electrophotographic device

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- Number: US 11,029,621 B2
- Document ID: US11029621B2
- Status: Granted
- Kind: B2
- Application number: 16/987,361
- Filed: 2020-08-06
- Published: 2020-11-19
- Granted: 2021-06-08
- Earliest claimed: 2018-03-30
- Assignees: Sumitomo Riko Company Limited
- Applicants: Sumitomo Riko Company Limited
- Inventors: Kosuke Minematsu; Yutaka Kadoshima; Yasunori Nimura
- Web page: https://patentgrep.com/patent/US11029621B2

## CPC

- G03G 15/0233: {Structure, details of the charging member, e.g. chemical composition, surface properties}
- F16C 13/00: Rolls, drums, discs, or the like (guide rollers in feeding webs B65H27/00; calender rolls, bearings therefor D21G1/02; rotary drums or rollers for heat-exchange or heat-transfer apparatus F28F5/02); Bearings or mountings therefor
- G03G 5/104: {comprising inorganic material other than metals, e.g. salts, oxides, carbon}
- G03G 5/105: {comprising electroconductive macromolecular compounds}
- G03G 15/0818: {characterised by the structure of the donor member, e.g. surface properties}
- G03G 15/162: {details of the the intermediate support, e.g. chemical composition}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

A conductive roll for electrophotographic device is provided. The conductive roll for electrophotographic device 10 includes a shaft body 12 and a non-foamed elastic body layer 14 formed on an outer periphery of the shaft body 12. The elastic body layer 14 is made of a cross-linked product of a silicone rubber composition containing the following (a) to (d), and a secondary particle diameter of the following (d) in the elastic body layer 14 is within a range of 100 to 500 nm. (a) is an organopolysiloxane, (b) is a crosslinking agent, (c) is a microcapsule catalyst made of fine resin particles which encapsulate a crosslinking catalyst by a resin other than a silicone resin, and (d) is silica with a BET specific surface area of 70 to 350 m2/g.

## Claims

### Claim 1

A conductive roll for electrophotographic device, comprising a shaft body and a non-foamed elastic body layer formed on an outer periphery of the shaft body, wherein
the elastic body layer is made of a cross-linked product of a silicone rubber composition containing the following (a) to (d), and
a secondary particle diameter of the following (d) in the elastic body layer is within a range of 100 to 500 nm, and the following (d) has a dimethylsilyl group or a trimethylsilyl group on a surface,
(a) an organopolysiloxane
(b) a crosslinking agent
(c) a microcapsule catalyst made of fine resin particles which encapsulate a crosslinking catalyst by a resin other than a silicone resin
(d) silica having a BET specific surface area of 70 to 350 m2/g,
wherein the resin in (c) is a thermosetting resin,
the resin in (c) is at least one of a polyvinyl butyral resin, an epoxy resin, an acrylic resin, and an unsaturated polyester resin,
and a content of (d) is within a range of 3.0 to 35 parts by mass with respect to 100 parts by mass of (a).