# US 4,399,060 A · Semiconductive elastomeric composition

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- Number: US 4,399,060 A
- Document ID: US4399060A
- Status: Granted
- Kind: A
- Application number: 06/233,220
- Filed: 1981-02-10
- Granted: 1983-08-16
- Earliest claimed: 1981-02-10
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Gary L. Glass
- Web page: https://patentgrep.com/patent/US4399060A

## CPC

- H01B 9/027: {composed of semi-conducting layers}
- C08L 23/0846: with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
- H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon
- C08K 3/04: Carbon
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Semiconductive elastomeric compositions useful as the outer layer on insulated electric cables and suitable for high temperature vulcanization techniques.

## Claims

### Claim 1

Semiconductive elastomeric composition comprising:
(a) 100 parts by weight of a copolymer of ethylene, 40-62 weight percent of an alkyl acrylate and 0.5-10 weight percent of a monoalkyl ester of 1,4-butenedioic acid;
(b) 1 to 10 parts by weight of a peroxide curing agent;
(c) 10 to 150 parts by weight of an electrically conductive carbon black; and
(d) 0 to 100 parts by weight of a copolymer of ethylene with propylene and/or an unconjugated diene.

### Claim 2 (depends on 1)

Composition of claim 1 wherein component (d) comprises 0 to 40 parts by weight.

### Claim 3 (depends on 1)

Composition of claim 1 wherein component (d) comprises 10 to 40 parts by weight.

### Claim 4 (depends on 1)

Composition of claim 1 further comprising 0.5-15 parts by weight of an auxiliary non-peroxide curing agent.

### Claim 5 (depends on 1)

Composition of claim 1 further comprising 1-20 parts by weight of a release agent system.

### Claim 6 (depends on 1)

Composition of claim 1 further comprising at least one additive selected from the group consisting of antioxidants, plasticizers, fillers, pigments and light stabilizers.

### Claim 7 (depends on 1)

Composition of claim 1 wherein component (a) is a copolymer containing 38.5-43.5 weight percent ethylene, 53-57 weight percent methyl acrylate and 3.5-4.5 weight percent ethyl hydrogen maleate.

### Claim 8 (depends on 1)

Composition of claim 1 wherein component (d) is a copolymer of ethylene, propylene and 1,4-hexadiene.

### Claim 9 (depends on 1)

Electrical cable having a conductive metallic core, an insulation layer concentric with and outside of said core, and a semi-conductive layer contiguous with and outside said insulation layer, said semi-conductive layer consisting of the elastomeric composition of claim 1.

### Claim 10 (depends on 9)

The electrical cable of claim 9 wherein the insulating layer consists essentially of a polymer selected from the group consisting of crosslinked polyethylene and EPDM rubber.