# US 7,744,781 B2 · Conductive thermoplastic elastomer composition, method of producing same, and molding

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- Number: US 7,744,781 B2
- Document ID: US7744781B2
- Status: Granted
- Kind: B2
- Application number: 11/882,711
- Filed: 2007-08-03
- Published: 2008-02-21
- Granted: 2010-06-29
- Earliest claimed: 2006-08-16
- Assignees: Sumitomo Rubber Industries, Ltd.
- Inventors: Kei Tajima; Hideyuki Okuyama
- Web page: https://patentgrep.com/patent/US7744781B2

## CPC

- C08L 23/0892: with monomers containing atoms other than carbon, hydrogen or oxygen
- C08L 9/02: Copolymers with acrylonitrile
- C08L 21/00: Compositions of unspecified rubbers
- C08L 23/0846: with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
- C08L 23/0869: with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 101/12: characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity (liquid crystal materials or compositions C09K19/00)
- G03G 15/0233: {Structure, details of the charging member, e.g. chemical composition, surface properties}
- G03G 15/1685: {Structure, details of the transfer member, e.g. chemical composition}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A conductive thermoplastic elastomer composition comprising a component (A) containing a thermoplastic resin or/and a thermoplastic elastomer; a component (B) comprising an ionic-conductive agent containing an ethylene oxide-propylene oxide copolymer or/and an ethylene oxide-propylene oxide-allyl glycidyl ether copolymer and a metal salt contained in the ethylene oxide-propylene oxide copolymer or/and the ethylene oxide-propylene oxide-allyl glycidyl ether copolymer; and a component (C) comprising an ethylene-acrylic ester-maleic anhydride copolymer.

## Claims

### Claim 1

A conductive thermoplastic elastomer composition comprising:
a component (A) comprising a thermoplastic elastomer composition containing a mixture of an olefin resin and a styrene thermoplastic elastomer and at least one rubber component selected from the group consisting of EPDM and NBR dynamically crosslinked and dispersed in the mixture of the olefin resin and the styrene thermoplastic elastomer;
a component (B) comprising an ionic-conductive agent containing an ethylene oxide-propylene oxide-allyl glycidyl ether copolymer and a metal salt, composed of metal cations and anions having a fluoro group and a sulfonyl group, contained in said ethylene oxide-propylene oxide-allyl glycidyl ether copolymer; and
a component (C) comprising an ethylene-acrylic ester-maleic anhydride copolymer;
wherein a mixing ratio between the olefin resin and the styrene thermoplastic elastomer of the component (A) is 30 to 50 parts by mass of the olefin resin mixed with 100 parts by mass of the styrene thermoplastic elastomer;
wherein 200 to 400 parts by mass of the at least one rubber component is mixed with 100 parts by mass of the mixture of the olefin resin and the styrene thermoplastic elastomer; and
wherein the conductive elastomer composition contains 20 to 40% of the component (B) in a volume fraction.

### Claim 2 (depends on 1)

The conductive thermoplastic elastomer composition according to claim 1, further comprising a component (D) consisting of a polyester thermoplastic elastomer.

### Claim 3 (depends on 1)

The conductive thermoplastic elastomer composition according to claim 1, wherein said dynamic crosslinking is performed by using a resinous crosslinking agent.

### Claim 4 (depends on 1)

The conductive thermoplastic elastomer composition according to claim 1, wherein said ethylene oxide-propylene oxide-allyl glycidyl ether copolymer of said component (B) is dynamically crosslinked by a peroxide.

### Claim 5 (depends on 1)

A method of producing the conductive thermoplastic elastomer composition according to claim 1, wherein before said component (A) and said component (B) are mixed with each other, said component (A) is dynamically crosslinked.

### Claim 6 (depends on 1)

A molding obtained by molding the conductive thermoplastic elastomer composition according to claims 1.

### Claim 7 (depends on 1)

A molding obtained by subjecting the conductive thermoplastic elastomer composition according to claim 1 to expansion molding.

### Claim 8 (depends on 1)

A molding, obtained by molding the conductive thermoplastic elastomer composition according to claim 1, which is used as a conductive roller.

### Claim 9 (depends on 6)

The molding according to claim 6, which is surface-treated.