# US 5,707,699 A · Electroconductive resin composition, sheet, molded product and container

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- Number: US 5,707,699 A
- Document ID: US5707699A
- Status: Granted
- Kind: A
- Application number: 08/834,297
- Filed: 1997-04-15
- Granted: 1998-01-13
- Earliest claimed: 1995-01-26
- Assignees: Denki Kagaku Kogyo Kabushiki Kaisha
- Inventors: Takeshi Miyakawa; Mikio Shimizu
- Web page: https://patentgrep.com/patent/US5707699A

## CPC

- H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon
- C08L 23/04: Homopolymers or copolymers of ethene
- C08L 25/06: Polystyrene
- C08L 71/123: {not modified by chemical after-treatment}
- C08L 23/02: not modified by chemical after-treatment
- C08L 25/04: Homopolymers or copolymers of styrene
- C08L 25/10: with conjugated dienes
- C08L 51/00: Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds (for ABS polymers C08L55/02); Compositions of derivatives of such polymers
- C08L 53/00: Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1386: Natural or synthetic rubber or rubber-like compound containing
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An electroconductive resin composition comprising (A) at least one thermoplastic resin selected from the group consisting of a polyphenylene ether type resin, a polystyrene type resin and an ABS type resin, (B) carbon black, and (C) an olefin type resin, said electroconductive resin composition containing from 5 to 50 parts by weight of (B) the carbon black per 100 parts by weight of (A) the thermoplastic resin, and from 1 to 30 parts by weight of (C) the olefin type resin per 100 parts by weight of the total amount of (A) the thermoplastic resin and (B) the carbon black, and said electroconductive resin composition having a surface resistivity of from 10.sup.2 to 10.sup.10 .OMEGA..

## Claims

### Claim 1

An electroconductive resin composition, consisting essentially of:
a) a polystyrene resin, a high impact polystyrene resin, or a mixture thereof (A);
b) 5 to 50 parts by weight of carbon black per 100 parts by weight of A; and
c) 1 to 30 parts by weight of an olefin resin (C) per 100 parts by weight of A,
wherein said electroconductive resin composition has a surface resistivity of from 10.sup.2 to 10.sup.10 .OMEGA..

### Claim 2 (depends on 1)

The electroconductive resin composition according to claim 1, wherein (C) the olefin resin is a polyethylene resin.

### Claim 3 (depends on 1)

The electroconductive resin composition according to claim 1, wherein (C) the olefin resin is an ethylene/.alpha.-olefin copolymer resin.

### Claim 4 (depends on 1)

An electroconductive resin sheet made of the resin composition as defined in claim 1.

### Claim 5 (depends on 1)

An injection molded product made of the resin composition as defined in claim 1.

### Claim 6 (depends on 4)

An electroconductive container obtained by thermoforming the electroconductive resin sheet as defined in claim 4.