Strippable semi-conductive insulation shield
OwnerKawai Pang, Timothy Personinventors
Life of this patent
Estimating the term…
Abstract
Swellable nano-particles, such as layered nano-particles, which are treated or contacted with one or more swelling agents, such as a surfactant, improves the thermal stability of insulation shield in power cables and also permits the use of low levels of NBR and vinyl-acetate EVA copolymers in such insulation shield.
Claims32
A polymeric resin composition which, when cross-linked, is effective to provide an insulation shield for power cable which has strip force of greater than 3 pounds per half inch at 23 degrees Celsius after being stored at 100 degrees Celsius for 2 weeks and an initial strip force of not greater than 24 pounds per half inch at 23 degrees Celsius, the polymeric resin composition comprising:
- (a) a copolymer of ethylene and an unsaturated ester selected from the group consisting of vinyl esters, acrylic acid esters, methacrylic acid esters and mixtures thereof;
- (b) nano-particles which have been contacted with a swelling agent;
- and
- (c) carbon black
- wherein the copolymer, the nano-particles and the carbon black being in amounts which will provide a cross-linked insulation shield with a strip tension of greater than 3 pounds per half inch at 23 degrees Celsius after being stored at 100 degrees Celsius for 2 weeks and an initial strip force of not greater than 24 pounds per half inch at 23 degrees Celsius.
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A polymeric resin composition which when cross-linked which is effective to provide an insulation shield for power cable which has strip tension of greater than 3 pounds per half inch at 23 degrees Celsius after being stored at 100 degrees Celsius for 2 weeks and an initial strip force of not greater than 24 pounds per half inch at 23 degrees Celsius., the polymeric resin composition comprising:
- (a) from 15 to 40 weight percent of a comonomer of ethylene and an unsaturated ester selected from the group consisting of vinyl esters, acrylic acid esters, methacrylic acid esters and mixtures thereof;
- (b) at least 1 weight percent of nano-particles which have been contacted with a swelling agent which includes an onium ion;
- and
- (c) from 10 to 50 weight percent of carbon black,
- wherein the nano-particles and the carbon black being in amounts which will provide the insulation shield composition when cross-linked with a strip tension of greater than 3 pounds per half inch at 23 degrees Celsius after being stored at 100 degrees Celsius for 2 weeks and an initial strip force of not greater than 24 pounds per half inch at 23 degrees Celsius.
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Power cable comprising:
- (a) an electrical conductor;
- (b) an insulation layer which surrounds the electrical conductor;
- and
- (c) an insulation shield layer which surrounds and is contiguous with the insulation layer, the insulation shield layer comprising a cross-linked composition made from a blend which comprises
- (i) a copolymer of ethylene and an unsaturated ester selected from the group consisting of vinyl esters, acrylic acid esters, methacrylic acid esters and mixtures thereof;
- (ii) nano-particles which have been contacted with a swelling agent which includes an onium ion;
- and
- (iii) carbon black,
- wherein the copolymer, the nano-particles and the carbon black being in amounts which will provide the insulation shield with a strip tension of greater than 3 pounds per half inch at 23 degrees Celsius after being stored at 100 degrees Celsius for 2 weeks and an initial strip force of not greater than 24 pounds per half inch at 23 degrees Celsius.
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Power cable comprising:
- (a) an electrical conductor;
- (b) an insulation layer which surrounds the electrical conductor;
- and
- (c) an insulation shield layer which surrounds and is contiguous with the insulation layer, the insulation shield layer comprising a cross-linked composition made from a blend which comprises
- (i) from 15 to 40 weight percent of a comonomer of ethylene and an unsaturated ester selected from the group consisting of vinyl esters, acrylic acid esters, methacrylic acid esters and mixtures thereof;
- (ii) at least 1 weight percent of nano-particles which have been contacted with a swelling agent which includes an onium ion;
- and
- (iii) from 10 to 50 weight percent of carbon black, wherein the nano-particles and the carbon black being in amounts which will provide the insulation shield with a strip tension of greater than 3 pounds per half inch at 23 degrees Celsius after being stored at 100 degrees Celsius for 2 weeks and an initial strip force of not greater than 24 pounds per half inch at 23 degrees Celsius.
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A polymeric resin composition which, when cross-linked, is effective to provide an insulation shield for power cable, the polymeric resin composition comprising:
- (a) from 15 to 40 weight percent of a comonomer of ethylene and an unsaturated ester selected from the group consisting of vinyl esters, acrylic acid esters, methacrylic acid esters and mixtures thereof and less than 5 weight percent nitrile butadiene rubber;
- (b) at least 1 weight percent of nano-particles which have been contacted with a swelling agent which includes an onium ion;
- and
- (c) from 10 to 50 weight percent of carbon black.
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Power cable comprising:
- (a) an electrical conductor;
- (b) an insulation layer which surrounds the electrical conductor;
- and
- (c) an insulation shield layer which surrounds and is contiguous with the insulation layer, the insulation shield layer comprising a cross-linked composition made from a blend which comprises
- (i) from 15 to 40 weight percent of a comonomer of ethylene and an unsaturated ester selected from the group consisting of vinyl esters, acrylic acid esters, methacrylic acid esters and mixtures thereof and less than 5 weight percent nitrile butadiene rubber;
- (ii) at least 1 weight percent of nano-particles which have been contacted with a swelling agent which includes an onium ion;
- and
- (iii) from 10 to 50 weight percent of carbon black,
- wherein the nano-particles and the carbon black being in amounts which will provide the insulation shield with a strip tension of greater than 3 pounds per half inch at 23 degrees Celsius after being stored at 100 degrees Celsius for 2 weeks and an initial strip force of not greater than 24 pounds per half inch at 23 degrees Celsius.
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A method for making an insulation shield for power cable, which shield has strip force of greater than 3 pounds per half inch at 23 degrees Celsius after being stored at 100 degrees Celsius for 2 weeks and an initial strip force of not greater than 24 pounds per half inch at 23 degrees Celsius, the method comprising blending:
- (a) a copolymer of ethylene and an unsaturated ester selected from the group consisting of vinyl esters, acrylic acid esters, methacrylic acid esters and mixtures thereof;
- (b) nano-particles which have been contacted with a swelling agent;
- and
- (c) carbon black,
- wherein the blend having less than 5 weight percent nitrile butadiene rubber and less than 28 percent vinyl acetate and
- wherein the comonomer, the nano-particles and the carbon black being in amounts which will provide a cross-linked insulation shield with a strip tension of greater than 3 pounds per half inch at 23 degrees Celsius after being stored at 100 degrees Celsius for 2 weeks and an initial strip force of not greater than 24 pounds per half inch at 23 degrees Celsius.
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Dependencies are inferred from the claim text.