INSULATED ELECTRIC CABLE

• US 20130306351A1
• Filed: 02/02/2012
• Published: 11/21/2013
• Est. Priority Date: 02/04/2011
• Status: Abandoned Application

• Current Assignee: INEOS Manufacturing Belgium NV (Ineos AG)
• Original Assignee: INEOS Manufacturing Belgium NV (Ineos AG)
• Inventors: Lambert, Yves-Julien, Schombourg, Jacques Jean Francois Joseph
• Application Number:
  US13/982,637
• Publication Number:
  US 20130306351A1
• Time in Patent Office: Days
• US Class Current: 174/120.SC
• CPC Class Codes: H01B 3/44 vinyl resins; acrylic resins silicones H01B3/46
• CPC Class Codes: H01B 7/00 Insulated conductors or cables characterised by their form
• CPC Class Codes: H01B 7/38 with arrangements for facilitating removal of insulation
• CPC Class Codes: H01B 9/028 with screen grounding means, e.g. drain wires

Abstract

An insulated cable is disclosed which comprises an electrical core conductor (1) having arranged coaxially around it at least three extruded layers of polymer-based material, which layers comprise an insulating layer (3) comprising a copolymer of polyethylene and an acrylate, an outer layer (5) of a semi-conductive material, and an intermediate layer (4) between the insulating and outer layers which comprises polyethylene and is substantially free of any acrylate or conducting material, such that the outer layer (5) is strippable from the intermediate layer (4).

Claims

1-13. -13. (canceled)

14. Insulated cable comprising an electrical core conductor (1) having arranged coaxially around it at least three extruded layers of polymer-based material, which layers comprise an insulating layer (3) comprising a copolymer of polyethylene and an acrylate, an outer layer (5) of a semi-conductive material, and an intermediate layer (4) between the insulating and outer layers which comprises polyethylene and is substantially free of any acrylate or conducting material, such that the outer layer (5) is strippable from the intermediate layer (4).

15. Cable according to claim 14, which additionally comprises an inner layer (2) of a semi-conductive material between the core conductor (1) and the insulating layer (3).

16. Cable according to claim 14, wherein the intermediate layer comprises at least 95 wt % polyethylene having a density below 940 kg/m3.

17. Cable according to claim 14, wherein the intermediate layer comprises at least 95 wt % polyethylene having a density below 925 kg/m3.

18. Cable according to claim 14, wherein the intermediate layer comprises at least 95 wt % polyethylene having a density below 920 kg/m3.

19. Cable according to claim 14, wherein the insulating layer is an ethylene/alkyl acrylate copolymer in which the alkyl acrylate is butyl acrylate or methyl methacrylate, preferably a low density polyethylene containing an ethylene/butyl acrylate copolymer and crosslinked with peroxide.

20. Cable according to claim 14, wherein the insulating layer is an ethylene/alkyl acrylate copolymer in which the alkyl acrylate is butyl acrylate or methyl methacrylate, crosslinked with peroxide.

21. Cable according to claim 20, wherein the ethylene/alkyl acrylate copolymer has a density of 910-940 kg/m3, a melt index MI2 of 0.2-5 g/10 min, and an acrylate content in the copolymer 0.5-5 wt %.

22. Cable according to claim 14, wherein the outer layer is selected from low density polyethylene, linear low density polyethylene, ethylene/vinyl acetate copolymer, ethylene/alkyl acrylate copolymer where the alkyl acrylate is preferably ethyl or butyl acrylate, high density polyethylene, acrylonitrile rubber, EPDM or blends thereof.

23. Cable according to claim 14, wherein the outer layer comprises an ethylene/vinyl acetate copolymer containing carbon black and crosslinked with peroxide.

24. Cable according to claim 14, wherein the force required to strip the outer layer from the intermediate layer at a 180°

angle of pull is from 2 to 60N per cm as measured by the French Standard HN 33-S-23 from Electricite de France (EdF).

25. Cable according to claim 14, wherein the absolute thickness of the intermediate layer is between 50 and 200 μ

m.

26. Cable according to claim 14, wherein the ratio of the thickness of the outer layer to the thickness of the intermediate layer is in the range 20:

1 to 1;

1.