Claims
- 1. A electrical conductor coated with an insulating layer of a crosslinkable polymer composition comprising
- (a) a polymer selected from the group consisting of copolymers of ethylene and vinyl esters of C.sub.2-6 aliphatic carboxylic acids, copolymers of ethylene and C.sub.1-6 alkyl acrylates, copolymers of ethylene and C.sub.1-6 alkyl methacrylates, or mixtures thereof;
- (b) 80 to 400 phr inorganic filler selected from the group consisting of hydrated aluminum oxide, hydrated magnesia, hydrated calcium silicate, and hydrated magnesium carbonate;
- (c) 0.5 to 5 phr of a lower alkyl-, alkenyl-, alkynyl- or aryl-alkoxysilane having from 1 to 3 C.sub.1-6 alkoxy substituents;
- (d) 0.5 to 8 phr antioxidant; and
- (e) 0.25 to 8 phr low molecular weight polymeric processing additive comprised of aliphatic resins having an average molecular weight less than 2000 and containing ester functional groups.
- 2. The coated electrical conductor of claim 1 wherein (a) is ethylene-vinyl acetate copolymer, ethylene-butyl acrylate copolymer, or mixtures thereof, (d) is a thio compound, a hindered phenol, polymerized, 1,2-dihydro-2,2,4-trimethyl quinoline, tris(3,5-di-t-butyl-4-hydroxy benzyl)isocyanurate or mixtures thereof and (e) is a mixture of hydrocarbon resin oligomers and ester-containing resin oligomers and wherein the predominant oligomers have molecular weights less than 2000.
- 3. The coated electrical conductor of claim 2 wherein the conductor is copper wire.
- 4. The coated electrical conductor of claim 3 wherein the crosslinkable polymeric composition additionally contains from 1 to 8 phr of a chemical crosslinking agent.
- 5. The coated electrical conductor of claim 4 wherein the chemical crosslinking agent is an organic peroxide, (c) is a vinyl alkoxysilane, (e) has a specific gravity from 0.92 to 0.98 and softening point from 90.degree. C. to 110.degree. C. and additionally containing 0.25 to 5 phr of a second processing additive selected from the group consisting of a fatty acid, a calcium soap of a fatty acid, an aluminum soap of a fatty acid, a fatty acid amide, a mixture of a fatty acid and a fatty acid amide, a natural or synthetic wax and low molecular weight polyethylene.
- 6. The coated electrical conductor of claim 5 containing 80 to 200 phr (b), 0.75 to 4 phr (c), 1 to 6 phr (d), 0.25 to 5 phr (e) and 1.5 to 5 phr organic peroxide.
- 7. The coated electrical conductor of claim 6 wherein (a) is an ethylene-vinyl acetate copolymer having from 9% to 30% vinyl acetate polymerized and a melt index from 0.5 to 5.
- 8. The coated electrical conductor of claim 6 wherein (b) is hydrated alumina.
- 9. The coated electrical conductor of claim 6 wherein (c) is vinyltrimethoxysilane.
- 10. The coated electrical conductor of claim 6 wherein (d) is a mixture of distearyl-3,3'-thiodipropionate and tetrakis(methylene (3,5-di-t-butyl-4-hydroxyhydrocinnamate)) methane.
- 11. The coated electrical conductor of claim 6 wherein (d) is a mixture of a bis alkyl sulfide and tetrakis(methylene (3,5-di-ti-butyl-4-hydroxyhydrocinnamate)) methane.
- 12. The coated electrical conductor of claim 6 wherein the organic peroxide is dicumyl peroxide.
- 13. The coated electrical conductor of claim 6 wherein the organic peroxide is alpha, alpha'-bis(t-butylperoxy)diisopropyl- benzene.
- 14. The coated electrical conductor of claim 6 wherein the second processing agent is a mixture of ethylene-bis-stearamide and lauric acid.
- 15. The coated electrical conductor of claim 6 wherein (e) is a mixture of aliphatic hydrocarbon oligomers produced by the polymerization of a mixed olefin feed obtained from petroleum cracking with a minor amount of an olefin-vinyl ester copolymer.
- 16. The coated electrical conductor of claim 7 wherein (a) contains 12 to 32 percent vinyl acetate.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application Ser. No. 07/921,617 now U.S. Pat. No. 5,225,469, filed Aug. 3, 1992, which is a continuation of application Ser. No. 07/562,762, filed Aug. 3, 1990, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4381362 |
Biggs et al. |
Apr 1983 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
921617 |
Aug 1992 |
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Continuations (1)
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Number |
Date |
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Parent |
562762 |
Aug 1990 |
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