Patent US4469538A successfully refreshed from Google Patents.
US4469538A
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Process for continuous production of a multilayer electric cable and materials therefor
Assignee: ANACONDA ACQUISITION Co
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Filing: 1983-02-22
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Granted: 1984-09-04
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Expires: 2003-02-22
Abstract
Abstract An improved multilayer electric cable is disclosed having a conductive core, an extruded strand shield (ESS) layer, an insulating layer of polymeric insulation material surrounding the core and coaxial therewith, a semi-conductive insulation shield (EIS) layer strippably bonded to the insulation layer surrounding it and coaxial therewith and, preferably, a plurality of axially extending drain wires disposed within the semiconductive EIS layer. The semi-conductive EIS layer is formed of a copolymer of an ethylene/alkylacrylate/monoalkyl ester of 1,4-butenedioic acid copolymer, conductive carbon black, and a peroxide curing agent and preferably also a copolymer of ethylene and propylene or a copolymer of ethylene, propylene and an unconjugated diene. The semi-conductive EIS layer is applied by extrusion at elevated temperature in a dry gas atmosphere. Such dry processing conditions are sufficiently severe that the copolymer of ethylene/acrylate/ester can reliably serve as a suitable basis for the semi-conductive EIS layer, since other conventional semi-conductive compositions are susceptible to being adversely affected by the severe conditions of dry processing.
Inventors
- 👤 Robert M. Wade
- 👤 George N. Benjamin
- 👤 Marwick H. Solomon
- 👤 Daniel H. Jessop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:03
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; H01B13/145; H01B1/00; H01B1/20; H01B1/24; H01B13/141; H01B13/148; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/109; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
187 words
A process for continuously manufacturing a multilayer electric cable comprising the steps of: (a) providing an elongated conductive core; (b) extruding at least one extrudable unvulcanized polymeric material around said elongated conductive core to form at least one layer of inner polymeric material coaxial with and contiguous to said conductive core; (c) extruding an extrudable unvulcanized polymeric material capable of being strippably bonded to said inner polymeric material and comprising: (i) a copolymer of ethylene alkylacrylate, and a monoalkyl ester of 1-4 butenedioic acid; (ii) conductive carbon black; and (iii) a curing agent; around said inner polymeric material to form a semiconducting outer layer of polymeric material coaxial with and contiguous to said inner polymeric material; (d) simultaneously vulcanizing the combination of said inner and outer unvulcanized polymeric materials in a pressurized, high temperature, dry gas atmosphere; and (e) during said simultaneous vulcanizing step, strippably bonding said outer polymeric material and said inner polymeric material whereby the surfaces of the contiguous layers of said multilayer cable are minimally contaminated, and both the uniformity of adhesion between the layers and the continuity of the electric shield are enhanced.
Claim 2
Dependent Claim
187 words
A process for continuously manufacturing a multilayer electric cable comprising the steps of: (a) providing an elongated conductive core; (b) extruding at least one extrudable unvulcanized polymeric material around said elongated conductive core to form at least one layer of inner polymeric material coaxial with and contiguous to said conductive core; (c) extruding an extrudable unvulcanized polymeric material capable of being strippably bonded to said inner polymeric material and comprising: (i) a copolymer of ethylene alkylacrylate, and a monoalkyl ester of 1-4 butenedioic acid; (ii) conductive carbon black; and (iii) a curing agent; around said inner polymeric material to form a semiconducting outer layer of polymeric material coaxial with and contiguous to said inner polymeric material; (d) simultaneously vulcanizing the combination of said inner and outer unvulcanized polymeric materials in a pressurized, high temperature, dry gas atmosphere; and (e) during said simultaneous vulcanizing step, strippably bonding said outer polymeric material and said inner polymeric material whereby the surfaces of the contiguous layers of said multilayer cable are minimally contaminated, and both the uniformity of adhesion between the layers and the continuity of the electric shield are enhanced.
Claim 3
Dependent Claim
224 words
A process for continuously manufacturing a multilayer electric cable comprising the steps of: (a) providing an elongated conductive core as a center strand; (b) extruding a first extrudable unvulcanized polymeric material around said elongated conductive core to form a strand shield layer of said first polymeric material coaxial with and contiguous to said conductive core; (c) extruding a second extrudable unvulcanized polymeric material around said strand shield layer to form an insulation layer of said second polymeric material coaxial with and contiguous to said strand shield layer; (d) extruding a third extrudable unvulcanized polymeric material capable of being strippably bonded to said insulation layer and comprising: (i) a copolymer of ethylene, alkylacrylate and monoalkyl ester of 1-4 butenedioic acid; (ii) conductive carbon black; and (iii) a curing agent; around said insulation layer to form a semiconducting outer insulation shield layer of said third polymeric material coaxial with and contiguous to said insulation layer; (e) simultaneously vulcanizing the combination of said first, second and third unvulcanized polymeric materials in a pressurized, high temperature, dry gas atmosphere; and (f) during said simultaneous vulcanizing step, strippably bonding said insulation layer and said insulation shield layer whereby the surfaces of the contiguous layers of said multilayer cable are minimally contaminated and both the uniformity of adhesion between the layers and the continuity of the electric shield are enhanced.
Claim 4
Dependent Claim
224 words
A process for continuously manufacturing a multilayer electric cable comprising the steps of: (a) providing an elongated conductive core as a center strand; (b) extruding a first extrudable unvulcanized polymeric material around said elongated conductive core to form a strand shield layer of said first polymeric material coaxial with and contiguous to said conductive core; (c) extruding a second extrudable unvulcanized polymeric material around said strand shield layer to form an insulation layer of said second polymeric material coaxial with and contiguous to said strand shield layer; (d) extruding a third extrudable unvulcanized polymeric material capable of being strippably bonded to said insulation layer and comprising: (i) a copolymer of ethylene, alkylacrylate and monoalkyl ester of 1-4 butenedioic acid; (ii) conductive carbon black; and (iii) a curing agent; around said insulation layer to form a semiconducting outer insulation shield layer of said third polymeric material coaxial with and contiguous to said insulation layer; (e) simultaneously vulcanizing the combination of said first, second and third unvulcanized polymeric materials in a pressurized, high temperature, dry gas atmosphere; and (f) during said simultaneous vulcanizing step, strippably bonding said insulation layer and said insulation shield layer whereby the surfaces of the contiguous layers of said multilayer cable are minimally contaminated and both the uniformity of adhesion between the layers and the continuity of the electric shield are enhanced.
Claim 5
Dependent Claim
30 words
A process for continuously manufacturing a multilayer electric cable as in claim 2 wherein the second extrudable unvulcanized polymeric material is the same as the first extrudable unvulcanized polymeric material.
Claim 6
Dependent Claim
30 words
A process for continuously manufacturing a multilayer electric cable as in claim 1 or 2 wherein the high temperature of the dry gas atmosphere is at least about 500° F.
Claim 7
Dependent Claim
28 words
A process for continuously manufacturing a multilayer electric cable as in claim 1 or 2 wherein the dry gas atmosphere is pressurized to at least about 75 psig.
Claim 8
Dependent Claim
43 words
A process for continuously manufacturing a multilayer electric cable as in claim 1 or 2 wherein the semiconducting outer layer of extrudable unvulcanized polymeric material further comprises a copolymer of ethylene and propylene or a copolymer of ethylene, propylene and an unconjugated diene.
Claim 9
Dependent Claim
28 words
A process for continuously manufacturing a multilayer electric cable as in claim 6 wherein the high temperature of the dry gas atmosphere is at least about 500° F.
Claim 10
Dependent Claim
26 words
A process for continuously manufacturing a multilayer electric cable as in claim 7 wherein the dry gas atmosphere is pressurized to at least about 75 psig.
Claim 11
Dependent Claim
46 words
A process for continuously manufacturing a multilayer electric cable as in claims 1 or 2 further comprising the step of incorporating a plurality of axially extending drain wires disposed within the semiconducting unvulcanized outer layer after the semiconducting outer layer of polymeric material has been extruded.
Claim 12
Dependent Claim
51 words
A process for continuously manufacturing a multilayer electric cable as in claims 1 or 2 wherein the semiconducting outer layer of extrudable unvulcanized polymeric material comprises, in parts by weight per 100 parts by weight of total polymer: ______________________________________
(a) conductive carbon black
10-150 parts
(b) curing agent 1-20 parts
______________________________________
Claim 13
Dependent Claim
43 words
A process for continuously manufacturing a multilayer electric cable as in claim 6 wherein the copolymer of ethylene and propylene or a copolymer of ethylene, propylene and an unconjugated diene is present as 17 to 50 parts per 100 parts of total polymer.
Claim 14
Dependent Claim
53 words
A process for continuously manufacturing a multilayer electric cable as in claim 11 wherein the semiconducting outer layer of extrudable unvulcanized polymeric material comprises in parts by weight: ______________________________________
ethylene/acrylate/ester copolymer
50-83 parts
ethylene propylene monomer or ethylene
17-50 parts
propylene diene monomer copolymer
semi-conductive component
10-150 parts
curing agent 1-20 parts
______________________________________
Claim 15
Dependent Claim
44 words
A process for continuously manufacturing a multilayer electric cable as in claim 12 wherein the semiconducting outer layer of extrudable unvulcanized polymeric material further comprises 31-99 parts by weight of additives selected from the group consisting of oxidation resistance improvers, lubricants, and flame retarders.
Claim 16
Dependent Claim
50 words
A process for continuously manufacturing a multilayer electric cable as in claim 12 wherein the semiconducting outer layer of extrudable unvulcanized polymeric material comprises, in parts by weight: ______________________________________
ethylene/acrylate/ester copolymer
75 parts
ethylene propylene diene monomer copolymer
25 parts
conductive carbon black 25 parts
curing agent 10 parts
______________________________________
Claim 17
Dependent Claim
49 words
A process for continuously manufacturing a multilayer electric cable as in claim 12 wherein the semiconducting outer layer of extrudable unvulcanized polymeric material comprises, in parts by weight: ______________________________________
ethylene/acrylate/ester copolymer
75 parts
ethylene propylene diene monomer
25 parts
conductive carbon black
57 parts
curing agent 10 parts
______________________________________
Claim 18
Dependent Claim
37 words
A process for continuously manufacturing a multilayer electric cable as in claim 14 wherein the semiconducting outer layer of extrudable unvulcanized polymeric material further comprises: ______________________________________
antioxidant 2 parts
lubricant 4.5 parts
flame retarder 49.5 parts
______________________________________
Claim 19
Dependent Claim
37 words
A process for continuously manufacturing a multilayer electric cable as in claim 15 wherein the semiconducting outer layer of extrudable unvulcanized polymeric material further comprises: ______________________________________
antioxidant 2 parts
lubricant 4.5 parts
flame retarder 49.5 parts
______________________________________
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |