Electrical devices comprising polymeric insulating or semiconducting members

• US 5,246,783 A
• Filed: 08/15/1991
• Issued: 09/21/1993
• Est. Priority Date: 08/15/1991
• Status: Expired due to Term

• Current Assignee: Exxon Chemical Patents Inc. (Exxon Mobil Corporation)
• Original Assignee: Exxon Chemical Patents Inc. (Exxon Mobil Corporation)
• Inventors: Hendewerk, Monica L., Mehta, Aspy K., Spenadel, Lawrence
• Primary Examiner(s): Herbert, Jr., Thomas J.
• Application Number:
  US07/745,479
• Time in Patent Office: 768 Days
• Field of Search: 524/114, 526/129, 526/119, 502/117, 428/461, 428/457, 428/76, 428/930, 427/58, 174/110 R
• US Class Current: 428/461
• CPC Class Codes: C08L 2203/202 use in electrical wires or wirecoating
• CPC Class Codes: C08L 23/0815 Copolymers of ethene with aliphatic 1-olefins
• CPC Class Codes: C08L 23/083 Copolymers of ethene with aliphatic polyenes, i.e. containing more than one unsaturated bond
• CPC Class Codes: C08L 2312/00 Crosslinking
• CPC Class Codes: C08L 2314/06 Metallocene or single site catalysts
• CPC Class Codes: H01B 3/441 from alkenes
• CPC Class Codes: H01B 7/2813 Protection against damage caused by electrical, chemical or water tree deterioration
• CPC Class Codes: Y10S 174/28 Plural semiconductive layers
• CPC Class Codes: Y10S 174/31 having a shield or metallic layer
• CPC Class Codes: Y10S 428/93 Electric superconducting
• CPC Class Codes: Y10S 526/943 Polymerization with metallocene catalysts
• CPC Class Codes: Y10T 428/239 Complete cover or casing
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers

Abstract

Disclosed are electrically conductive and semiconductive devices utilizing polymers having resistance to water treeing and good dielectric properties. The polymer comprises ethylene polymerized with at least one C₃ to C₂₀ alpha-olefin and optionally at least one C₃ to C₂₀ polyene. The polymer utilized has a density in the range of about 0.86 g/cm³ to about 0.96 g/cm³, a melt index in the range of about 0.2 dg/min to about 100 dg/min, a molecular weight distribution in the range of about 1.5 to about 30, and a composition distribution breadth index greater than about 45 percent. For the polymer utilized, the tree rating is generally less than about 40, the power factor is in the range of about 0.0002 to about 0.0005, and the dielectric constant is in the range of about 1.8 to about 2.4.

Claims

1. An electrically conductive device having reduced treeing without the need of a treeing inhibitor, said device comprising:

(a) an electrically conductive member comprising at least one electrically conductive substrate; and

(b) at least one electrically insulating member substantially surrounding the electrically conductive member, wherein the insulating member comprises a polymer selected from the group consisting of ethylene polymerized with at least one comonomer selected from the group consisting of C₃ to C₂₀ alpha-olefins and C₃ to C₂₀ polyenes, and wherein the polymer has a density in the range Of about 0.86 g/cm³ to about 0.96 g/cm³, a melt index in the range of about 0.2 dg/min to about 100 dg/min, a molecular weight distribution in the range of about 1.5 to about 30, and a composition distribution breadth index greater than about 45 percent.

2. The device of claim 1 wherein the polymer has at least one of the following properties selected from the group consisting of a density in the range of about 0.865 g/cm³ to about 0.93 g/cm³, a melt index in the range of about 1 dg/min to about 50 dg/min, a molecular weight distribution in the range of about 1.7 to about 10, and a composition distribution breadth index greater than about 50 percent.

3. The device of claim 1 wherein the polymer is polymerized utilizing a metallocene catalyst system.

4. The device of claim 1 wherein the polymer comprises in the range of about 68 mole percent to about 99 mole percent ethylene based on the moles of monomer.

5. The device of claim 1 wherein the polymer is selected from the group consisting of ethylene/C₃ to C₂₀ alpha-olefin copolymers and ethylene/C₃ to C₂₀ alpha-olefin/C₃ to C₂₀ diene terpolymers.

6. The device of claim 5 wherein the polymer selected from the group consisting of copolymers of ethylene/butene-1, ethylene/hexene-1, ethylene/octene-1, and ethylene/propylene and terpolymers of ethylene/propylene/1,4-hexadiene and ethylene/butene-1/1,4-hexadiene.

7. The device of claim 1 wherein the polymer has at least one property selected from the group consisting of a density in the range of about 0.87 g/cm³ to about 0.91 g/cm³, a melt index in the range of about 3 dg/min to about 30 dg/min, a molecular weight distribution in the range of about 1.8 to about 3.5, and a composition distribution breadth index greater than about 60 percent.

8. The device of claim 7 wherein the polymer comprises in the range of about 73 mole percent to about 98 mole percent ethylene based on the moles of monomer.

9. The device of claim 7 wherein the polymer is crosslinked with at least one of the group consisting of crosslinking agents and radiation.

10. The device of claim 7 wherein the polymer is crosslinked with at least dicumyl peroxide.

11. The device of claim 7 wherein the polymer is polymerized utilizing a metallocene catalyst system.

12. The device of claim 7 wherein the insulating member comprises up to 50 weight percent filler.

13. The device of claim 8 wherein the polymer has a tree rating less than about 25, a power factor in the range of about 0.0002 to about 0.0005, and a dielectric constant in the range of about 1.8 to about 2.4.

14. The device of claim 13 wherein the conductive member comprises at least one selected from the group consisting of aluminum, copper and steel.

15. An electrically conductive device having reduced treeing without the need of a treeing inhibitor, said device comprising:

(a) an electrically conductive member comprising at least one electrically conductive substrate; and

(b) at least one semiconductive member substantially surrounding the electrically conductive member, wherein the semiconducting member comprises a polymer selected from the group consisting of ethylene polmerized with at least one comonomer selected from the group consisting of C₃ to C₂₀ alpha-olefins and C₃ to C₂₀ polyenes, and wherein the polymer has a density in the range of about 0.86 g/cm³ to about 0.96 g/cm³, a melt index in the range of about 0.2 dg/min to about 100 dg/min, a molecular weight distribution in the range of about 1.5 to about 30, and a composition distribution breadth index greater than about 45 percent, and the semiconducting member further comprises a conducting filler to render it semiconducting.

16. The device of claim 15 wherein the polymer is crosslinked with at least dicumyl peroxide.

17. The device of claim 15 wherein the polymer is selected from the group consisting of ethylene/C₃ to C₂₀ alpha-olefin copolymers and ethylene/C₃ to C₂₀ alpha-olefin/C₃ to C₂₀ diene terpolymers.

18. The device of claim 17 wherein the polymer is selected from the group consisting of copolymers of ethylene/butene-1, ethylene/hexene-1, ethylene/octene-1, and ethylene/propylene and terpolymers of ethylene/propylene/1,4-hexadiene and ethylene/butene-1/1,4-hexadiene.

19. The device of claim 15 wherein the polymer comprises in the range of about 75 mole percent to about 94 mole percent ethylene based on the moles of monomer.

20. The device of claim 17 wherein the polymer has at least one property selected from the group consisting of a density in the range of about 0.865 g/cm³ to about 0.93 g/cm³, a melt index in the range of about 1 dg/min to about 50 dg/min, a molecular weight distribution in the range of about 1.7 to about 10, and a composition distribution breadth index greater than about 50 percent.

21. The device of claim 20 wherein the polymer is crosslinked with at least one of the group consisting of crosslinking agents and radiation.

22. The device of claim 15 wherein the polymer has a density in the range of about 0.87 g/cm³ to about 0.91 g/cm³, a melt index in the range of about 3 dg/min to about 30 dg/min, a molecular weight distribution in the range of about 1.8 to about 3.5, and a composition distribution breadth index greater than about 60 percent.

23. The device of claim 22 wherein the polymer is polymerized utilizing a metallocene catalyst system.

24. The device of claim 22 wherein the semiconducting member comprises up to 50 weight percent carbon black filler.

25. The device of claim 24 wherein the polymer has a tree rating less than about 15, a power factor in the range of about 0.0002 to about 0.0005, and a dielectric constant in the range of about 1.8 to about 2.4.

26. The device of claim 25 wherein the conductive member comprises at least one selected from the group consisting of aluminum, copper and steel.

27. A semiconductive device having reduced treeing without the need of a treeing inhibitor, said device comprising:

(a) a semiconductive member; and

(b) an electrically insulating member substantially surrounding the semiconductive member;

wherein at least one of the group consisting of the semiconductive member and the electrically insulating member comprises a polymer selected from the group consisting of ethylene polymerized with at least one comonomer selected from the group consisting of C₃ to C₂₀ alpha-olefins and C₃ to C₂₀ polyenes, and wherein the polymer has a density in the range of about 0.86 g/cm³ to about 0.96 g/cm³, a melt index in the range of about 0.2 dg/min to about 100 dg/min, a molecular weight distribution in the range of about 1.5 to about 30, and a composition distribution breadth index greater than about 45 percent, and wherein the semiconducting member comprises a filler to render it semiconducting.

28. The device of claim 27 wherein the polymer is selected from the group consisting of ethylene/C₃ to C₂₀ alpha-olefin copolymers and ethylene/C₃ to C₂₀ alpha-olefin/C₃ to C₂₀ diene terpolymers.

29. The device of claim 28 wherein the polymer is crosslinked with at least one of the group consisting of crosslinking agents and radiation.

30. The device of claim 28 wherein the polymer is crosslinked with at least dicumyl peroxide.

31. The device of claim 28 wherein the polymer has at least one property selected from the group of properties consisting of a density in the range of about 0.865 g/cm³ to about 0.93 g/cm³, a melt index in the range of about 1 dg/min to about 50 dg/min, a molecular weight distribution in the range of about 1.7 to about 10, and a composition distribution breadth index greater than about 50 percent.

32. The device of claim 28 wherein the polymer is selected from the group consisting of copolymers of ethylene/butene-1, ethylene/hexene-1, ethylene/octene-1, and ethylene/propylene and terpolymers of ethylene/propylene/1,4-hexadiene and ethylene/butene-1/1,4-hexadiene.

33. The device of claim 27 wherein the polymer has at least one property selected from the group consisting of density in the range of about 0.87 g/cm³ to about 0.91 g/cm³, a melt index in the range of about 3 dg/min to about 30 dg/min, a molecular weight distribution in the range of about 1.8 to about 3.5, and a composition distribution breadth index greater than about 60 percent.

34. The device of claim 33 wherein the polymer is polymerized with a metallocene catalyst system.

35. The device of claim 33 wherein the polymer comprises in the range of about 73 to about 98 mole percent ethylene based on the total moles of monomer.

36. The device of claim 33 wherein the semiconducting member comprises up to 50 weight percent carbon black filler.

37. The device of claim 36 wherein the polymer has a tree rating less than about 10, a power factor in the range of about 0.0002 to about 0.0005, and a dielectric constant in the range of about 1.8 to about 2.4.

38. The device of claim 37 wherein the conductive member comprises at least one selected from the group consisting of aluminum, copper and steel.

39. An electrically conductive device having reduced treeing without the need of a treeing inhibitor, said device comprising:

(a) an electrically conductive member comprising at least one electrically conductive substrate; and

(b) at least one protective layer substantially surrounding and supported by the electrically conductive member, wherein at least one layer comprises a polymer selected from the group consisting of ethylene polymerized with at least one comonomer selected from the group consisting of C₃ to C₂₀ alpha-olefins and C₃ to C₂₀ polyenes, and the polymer has a density in the range of about 0.86 g/cm³ to about 0.96 g/cm³, a melt index in the range of about 0.2 dg/min to about 100 dg/min, a molecular weight distribution in the range of about 1.5 to about 30, and a composition distribution breadth index greater than about 45 percent.

40. The device of claim 39 wherein the polymer is polymerized with a metallocene catalyst system.

41. The device of claim 39 wherein the polymer comprises in the range of about 73 to about 98 mole percent ethylene based on the total moles of monomer.

42. The device of claim 39 wherein the polymer has at least one property selected from the group consisting of density in the range of about 0.865 g/cm³ to about 0.93 g/cm³, a melt index in the range of about 1 dg/min to about 50 dg/min, a molecular weight distribution in the range of about 1.7 to about 10, and a composition distribution breadth index greater than about 50 percent.

43. The device of claim 39 wherein the polymer is selected from the group consisting of ethylene/C₃ to C₂₀ alpha-olefin copolymers and ethylene/C₃ to C₂₀ alpha-olefin/C₃ to C₂₀ diene terpolymers.

44. The device of claim 43 wherein the polymer is selected from the group consisting of copolymers of ethylene/butene-1, ethylene/hexene-1, ethylene/octene-1, and ethylene/propylene and terpolymers of ethylene/propylene/1,4-hexadiene and ethylene/butene-1/1,4-hexadiene.

45. The device of claim 39 wherein the polymer has at least one property selected from the group consisting of a density in the range of about 0.87 g/cm³ to about 0.91 g/cm³, a melt index in the range of about 3 dg/min to about 30 dg/min, a molecular weight distribution in the range of about 1.8 to about 3.5, and a composition distribution breadth index greater than about 60 percent.

46. The device of claim 45 wherein the protective layer comprises up to 50 weight percent carbon black filler.

47. The device of claim 45 wherein the polymer has a tree rating less than about 40, a power factor in the range of about 0.0002 to about 0.0005, and a dielectric constant in the range of about 1.8 to about 2.4.

48. The device of claim 47 wherein the polymer is crosslinked with at least one of the group consisting of crosslinking agents and radiation.

49. The device of claim 47 wherein the polymer is crosslinked with at least dicumyl peroxide.

50. The device of claim 47 wherein the conductive member comprises at least one selected from the group consisting of aluminum, copper and steel.

51. The device of claim 47 wherein the at least one protective layer comprises a first shield layer adjacent the conductive member, an insulation layer adjacent the first shield layer, a second shield layer adjacent the insulation layer, and a jacket layer adjacent the second shield layer.

52. The device of claim 47 wherein the at least one protective layer comprises an insulation layer adjacent the conductive member and a jacket layer adjacent the insulation layer.