CN102086286A - Flame-retardant cable material composition, preparation method thereof and flame-retardant cable - Google Patents
Flame-retardant cable material composition, preparation method thereof and flame-retardant cable Download PDFInfo
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Abstract
The invention provides a flame-retardant cable material composition, which comprises a base material, a flame retardant and a softening agent, wherein the base material comprises polystyrene-poly[ethylene-(ethylene-propene)] copolymer and polyolefin. The invention also provides a method for preparing the flame-retardant cable material composition, and a flame-retardant cable prepared from the flame-retardant cable material composition. The flame-retardant cable has high tensile strength and good resilience.
Description
Technical field
The present invention relates to a kind of fire-resistant cable material composition and method of making the same, and by the flame retardant cable of this fire-resistant cable material preparation of compositions.
Background technology
Along with the high speed development of wires and cables industry, for fear of the fire failure that the cable burning causes, Flame-retardant Wire and Cable Compounds also more and more receives publicity.Traditional polyvinyl chloride (PVC) Flame-retardant Wire and Cable Compounds can produce a large amount of smog when fire takes place, contain poison gas, serious harm people's the security of the lives and property.So exploitation TPE non halogen wire and cable material is replaced traditional PVC CABLE MATERIALS and has been become industrial trend.The main terpolymer EP rubber (EPDM) that uses is as base-material among the present TPE.For example, a kind of high temperature halogen-free flame retardant polypropylene/EPT rubber cable material is disclosed in the prior art, the consisting of of this CABLE MATERIALS: terpolymer EP rubber, polypropylene, ammonium polyphosphate, silicone, rubber oil, linking agent, crosslinking coagent.This CABLE MATERIALS produces the problem of toxic smog when having solved burning, but its tensile property is poor, rebound resilience is bad.
Summary of the invention
The objective of the invention is the problem poor for the tensile property that overcomes non-halogen flame-retardant cable of the prior art, that rebound resilience is bad, the flame retardant cable that a kind of tensile property is good, rebound resilience is good feed composition is provided.
The invention provides a kind of flame retardant cable feed composition, this flame retardant cable feed composition contains base-material, fire retardant and tenderizer, and wherein, described base-material contains polystyrene-poly [ethene-(ethylene-propylene)] multipolymer and polyolefine.
The present invention also provides above-mentioned fire-resistant cable material preparation of compositions method, and this method comprises:
(1) with described polystyrene-poly [ethene-(ethylene-propylene)] multipolymer, polyolefine, fire retardant and tenderizer uniform mixing, obtains a kind of mixture;
(2) the mixture fusion that step (1) is obtained, extrude and granulation.
The present invention also provides a kind of flame retardant cable, and this flame retardant cable is to be obtained by above-mentioned flame retardant cable preparation of compositions.
Use polystyrene-poly [ethene-(ethylene-propylene)] multipolymer and polyolefine as base-material in the flame retardant cable feed composition of the present invention, compare as the CABLE MATERIALS of base-material with containing terpolymer EP rubber, tensile strength height, the rebound resilience of the flame retardant cable that flame retardant cable feed composition of the present invention is made are good.The result of embodiments of the invention and Comparative Examples shows that the tensile strength of flame retardant cable of the present invention is 14MPa, and elongation at break is 720%, and shore hardness is 85A; And the tensile strength of using terpolymer EP rubber to make the cable of base-material in Comparative Examples is 9MPa, and elongation at break is 550%, and shore hardness is 81A.The tensile property that CABLE MATERIALS of the present invention is described is good, rebound resilience is good.
Embodiment
One aspect of the present invention provides a kind of flame retardant cable feed composition, and this flame retardant cable feed composition contains base-material, fire retardant and tenderizer, and wherein, described base-material contains polystyrene-poly [ethene-(ethylene-propylene)] multipolymer and polyolefine.
In described base-material, polystyrene-poly [ethene-(ethylene-propylene)] multipolymer and the polyolefinic regular meeting that compares influence hardness, toughness and the tensile property of described flame retardant cable feed composition, in order to give hardness, toughness and the tensile property of flame retardant cable feed composition excellence of the present invention, total amount with base-material is a benchmark in the present invention, the content of described polystyrene-poly [ethene-(ethylene-propylene)] multipolymer is preferably 40-70 weight %, more preferably 50-67 weight %; Described polyolefinic content is preferably 30-60 weight %, more preferably 33-50 weight %.
In flame retardant cable feed composition of the present invention, the number-average molecular weight of described polystyrene-poly [ethene-(ethylene-propylene)] multipolymer can be 50,000-250,000, is preferably 15-20 ten thousand.The styrene content of this multipolymer can be preferably 30-32 weight % for the 25-40 weight % of multipolymer gross weight.This polystyrene-poly [ethene-(ethylene-propylene)] multipolymer can be commercially available product, for example (Kuraray companies) such as the S4033 of SEEPS series, S4044, S4055, S4077, S4099.Described polyolefine can be polypropylene and/or polyethylene, and described polyolefine is 0.1-5g/10min (described melting index detects according to the method among the ASTM1238, and actual conditions is: temperature is 230 ℃, and loading is 2.16kg) 230 ℃ melting index.
Described tenderizer can make polystyrene-poly [ethene-(ethylene-propylene)] multipolymer and the polyolefine can thorough mixing and make CABLE MATERIALS composition of the present invention have required flexibility, and the tenderizer among the present invention is preferably one or more in white oil, naphthenic oil, the paraffin oil.For example, described white oil can be 36# white oil (Kelamayi, Xinjiang refinery), described naphthenic oil can be KN4010, KN4006, YT-6, YT-10 (Kelamayi, Xinjiang refinery), and described paraffin oil can be KP6030 (Kelamayi, Xinjiang refinery) etc.With respect to the base-material of 100 weight parts, the content of described tenderizer is preferably the 10-50 weight part, more preferably the 13-38 weight part.
Described fire retardant can be various fire retardants general in this area, for example phosphorus flame retardant, nitrogen flame retardant, phosphorus-nitrogen containing flame retardant.With respect to the base-material of 100 weight parts, the content of described fire retardant is preferably the 35-115 weight part, more preferably the 50-85 weight part.Wherein, because phosphorus-nitrogen containing flame retardant good flame retardation effect and odorlessness problem, so the preferred phosphorus-nitrogen containing flame retardant of the present invention, for example contain the phosphorus-nitrogen containing flame retardant of trimeric cyanamide, tetramethylolmethane and ammonium polyphosphate.Fire retardant of the present invention for example can be Exolit IFR-10 and the Exolit IFR-11 (Hochest company) that is purchased.
In preferred implementation of the present invention, the present inventor finds, when using phosphorus-nitrogen containing flame retardant, in flame retardant cable feed composition of the present invention, add a certain amount of silicone master batch, can solve phosphorus nitrogen is the not problem of hydrolysis of mixed expanded type fire retardant.With respect to polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts, the content of described silicone master batch is the 2-50 weight part, is preferably the 2.5-40 weight part, more preferably the 5-20 weight part.Described silicone master batch is the particle product of solid silicone, (Dow Corning Corporations) such as for example commercially available MB50-001, MB50-002, MB50-004, MB40-006, MB50-007, MB50-010, MB50-011, MB50-313.
The present inventor also finds, adds nucleator in flame retardant cable feed composition of the present invention, can further improve the tensile property of made flame retardant cable, therefore, preferably also contains nucleator in the flame retardant cable feed composition of the present invention.With respect to polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts, the content of described nucleator can be the 0.1-5 weight part, is preferably the 0.3-2 weight part, more preferably the 0.5-1.5 weight part.It is nucleator that described nucleator is preferably sorbyl alcohol.Described sorbyl alcohol is that nucleator can be in two (Ben Yajiaji) sorbyl alcohol, two (to the methylbenzene methylene radical) sorbyl alcohol, two (chlorine is replaced benzal) sorbyl alcohol, two (to the ethyl benzal) sorbyl alcohol, two (4 methyl-benzal) sorbyl alcohol, styryl sorbyl alcohol, two (3, the 4-dimethyl benzene methylene radical) sorbyl alcohol one or more.For example commercially available U.S. is upright
3988i (U.S. Mei Liken chemical company).
In order to make flame retardant cable feed composition of the present invention have good oxidation-resistance, can also in this flame retardant cable feed composition, add antioxidant to be fit to application scenario and more secular application widely.Described antioxidant can be the mixture of hindered phenol, nitrogen heterocyclic ring polyphenol, phosphorous acid ester, monothioester or hindered phenol and phosphorous acid ester or monothioester.Antioxidant among the present invention is preferably hindered phenol and the phosphorous acid ester mixture according to part by weight 1: 0.5-2.Composite between hindered phenol and the phosphite antioxidant, not only can improve the alloy material performance, strengthen antioxidant effect, also can reduce cost.In flame retardant cable feed composition of the present invention, with respect to polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts, the content of described antioxidant is preferably the 0.5-8 weight part for for the 0.1-12 weight part.
In order to give flame retardant cable feed composition of the present invention with better light stability, reduce rate of ageing, can also comprise photostabilizer in the composition of the present invention.Described photostabilizer can be a UV light absorber, and for example salicylate, benzophenone, benzotriazole etc. can also be radical scavengers, for example hindered amine.Photostabilizer among the present invention is preferably hindered amine as light stabilizer.The destruction of UV-light to polymkeric substance can be eliminated or weaken to hindered amine as light stabilizer effectively, and other performance of polymkeric substance is not influenced; With polymkeric substance have good consistency, non-volatile, do not move, do not extracted out by water and tenderizer; Absorption to visible light is low, not painted, nondiscoloration; Close with the color of polymkeric substance, do not change the color of polymkeric substance after the interpolation; Can capture different free radicals, thereby prevent or delay the photodegradation process.In flame retardant cable feed composition of the present invention, with respect to polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts, the content of described photostabilizer is the 0.1-12 weight part, is preferably the 0.5-8 weight part.
In order to make flame retardant cable feed composition of the present invention have suitable color, can add different tinting materials by different needs.Described tinting material can be the tinting material that is used for CABLE MATERIALS well known in the art.In flame retardant cable feed composition of the present invention, with respect to polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts, the content of described tinting material is the 0.01-10 weight part, is preferably the 0.025-8 weight part.
Another aspect of the present invention also provides above-mentioned fire-resistant cable material preparation of compositions method, and this method comprises:
(1) with described polystyrene-poly [ethene-(ethylene-propylene)] multipolymer, polyolefine, fire retardant and tenderizer uniform mixing, obtains a kind of mixture;
(2) the mixture fusion that step (1) is obtained, extrude and granulation.
Further, also comprise adding nucleator, silicone master batch and antioxidant and/or photostabilizer and/or tinting material in the step of this method (I).
In preparation method of the present invention, described mixing can be used blending means known in those skilled in the art, and for example mechanically mixing is mixed as using high mixer, and the addition sequence to each raw material during mixing does not have special stipulation, and mixing time is 1-6 minute.Described extrusion device can be the known extrusion device of those skilled in the art, for example can be twin screw extruder or multiple screw extruder.Extrusion condition for example is: twin screw extruder, screw speed are 50-1200 rev/min, and extrusion temperature is 180-190 ℃.
Another aspect of the present invention also provides a kind of flame retardant cable, and wherein, this flame retardant cable is to be obtained by above-mentioned fire-resistant cable material preparation of compositions.Can adopt conventional the whole bag of tricks to prepare flame retardant cable of the present invention according to different needs to cable by flame retardant cable feed composition of the present invention.The shape of described flame retardant cable, length, thickness etc. also can change according to different needs.Preferably, the preparation method of flame retardant cable of the present invention comprises: above-mentioned flame retardant cable feed composition was descended dry 2-4 hour at 85 ℃, extrude under 180-200 ℃ through forcing machine, obtain flame retardant cable of the present invention.
Use polystyrene-poly [ethene-(ethylene-propylene)] multipolymer and polyolefine as base-material in the flame retardant cable feed composition of the present invention, compare as the CABLE MATERIALS of base-material with containing terpolymer EP rubber, tensile strength height, the rebound resilience of made flame retardant cable are good.The result of embodiments of the invention and Comparative Examples shows that the tensile strength of flame retardant cable of the present invention is 14MPa, and elongation at break is 720%, and shore hardness is 85A; And the tensile strength of using terpolymer EP rubber to make the cable of base-material in Comparative Examples is 9MPa, and elongation at break is 550%, and shore hardness is 81A.The tensile property that flame retardant cable of the present invention is described is good, rebound resilience is good.And being used sorbyl alcohol in flame retardant cable feed composition of the present invention is nucleator, and the tensile property of flame retardant cable of the present invention is greatly improved.When using phosphorus-nitrogen containing flame retardant, flame retardant effect is especially excellent, and in flame retardant cable feed composition of the present invention, add a certain amount of silicone master batch, can solve the not problem of hydrolysis of phosphorus-nitrogen containing flame retardant, make said composition not only keep good basic mechanical performance, and hydrolytic resistance is good, can satisfy the service requirements of different occasions.
Embodiment
Embodiment 1
SEEPS S4055 (Kuraray company) (its each performance perameter sees Table 1) with 100 weight parts, the polypropylene K8303 (China Petrochemical Industry) of 75 weight parts, the nitrogen phosphorus flame retardant ExolitIFR-10 (Hochest company) of 120 weight parts, 50 weight part paraffin oil KP6030 (Kelamayi, Xinjiang refinery), the nucleator 3988i of 1 weight part (U.S. Mei Liken chemical company), the silicone master batch MB50-001 of 19 weight parts (Dow Corning Corporation), 2 weight part hindered phenol antioxidant 1010 (vapour Bagong department), 2 weight part phosphite antioxidant 168 (vapour Bagong department) and 4 weight part hindered amine EB41-72 (vapour Bagong department), 4 weight part tinting material carbon blacks placed the high mixer thorough mixing 3 minutes, mixture is joined in the extrusion device parallel double-screw extruder then, extruding pelletization, extrusion condition is: twin screw extruder, screw speed is 50-1200 rev/min, extrusion temperature is 180-190 ℃, obtains the flame retardant cable feed composition.
Embodiment 2
SEEPS S4033 (Kuraray company) (its each performance perameter sees Table 1) with 100 weight parts, the polyethylene 2410T (China Petrochemical Industry) of 50 weight parts, the nitrogen phosphorus flame retardant Exolit IFR-10 (Hochest company) of 170 weight parts, 15 weight part naphthenic oil KN4010 (Kelamayi, Xinjiang refinery), 0.3 the nucleator 3988i of weight part (U.S. Mei Liken chemical company), 2.5 the silicone master batch MB50-006 of weight part (Dow Corning Corporation), 0.5 weight part hindered phenol antioxidant 1010 (vapour Bagong department), 0.5 weight part hindered amine EB41-72 (vapour Bagong department), 5 weight part carbon blacks placed the high mixer thorough mixing 3 minutes, then mixture is joined in the extrusion device parallel double rods forcing machine, method by embodiment 1 is carried out extruding pelletization, obtains the flame retardant cable feed composition.
Embodiment 3
SEEPS S4044 (Kuraray company) (its each performance perameter sees Table 1) with 100 weight parts, the polypropylene K8303 (China Petrochemical Industry) of 100 weight parts, 50 weight account polyethylene 2410T (China Petrochemical Industry), the nitrogen phosphorus flame retardant Exolit IFR-10 (Hochest company) of 90 weight parts, 125 weight part paraffin oil KP6030 (Kelamayi, Xinjiang refinery), the nucleator 3988i of 2 weight parts (U.S. Mei Liken chemical company), the silicone master batch MB50-0013 of 40 weight parts (Dow Corning Corporation), 8 weight part phosphite antioxidant 168 (vapour Bagong department), 8 weight part hindered amine EB41-72 (vapour Bagong department) and 7.5 weight part carbon blacks placed the high mixer thorough mixing 6 minutes, then mixture is joined in the extrusion device parallel double rods forcing machine, method by embodiment 1 is carried out extruding pelletization, obtains the flame retardant cable feed composition.
Embodiment 4
Method according to embodiment 1 prepares the flame retardant cable feed composition, different is that the polypropylene K8303 (China Petrochemical Industry) of SEEPS S4055 of 100 weight parts (Kuraray company) and 75 weight parts is replaced by the SEEPS S4055 of 100 weight parts and the polypropylene K8303 (China Petrochemical Industry) of 30 weight parts.
Embodiment 5
SEEPS S4099 (Kuraray company) (its each performance perameter sees Table 1) with 100 weight parts, the polypropylene K8303 (China Petrochemical Industry) of 42 weight parts, the magnesium hydroxide of the red phosphorus of 25 weight parts and 235 weight parts, 20 weight part paraffin oil KP6030 (Kelamayi, Xinjiang refinery), 1.5 the nucleator 3988i of weight part (U.S. Mei Liken chemical company), 2.5 weight part hindered phenol antioxidant 1010 (vapour Bagong department), 2.5 weight part phosphite antioxidant 168 (vapour Bagong department) and 5 weight part hindered amine EB41-72 (vapour crust), 5 weight part tinting material carbon blacks, method by embodiment 1 is carried out extruding pelletization, obtains the flame retardant cable feed composition.
Embodiment 6
Prescription and method according to embodiment 1 prepare the flame retardant cable feed composition, and different is not add silicone master batch.
Embodiment 7
Prescription and method according to embodiment 1 prepare the flame retardant cable feed composition, and different is, not with nucleator.
Comparative Examples 1
Prescription and method by embodiment 1 prepare the flame retardant cable feed composition, and different is polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts to be replaced with the terpolymer EP rubber (Jihua Group Co's resin synthesizes factory) of 100 weight parts.
Comparative Examples 2
Prescription and method by embodiment 7 prepare the flame retardant cable feed composition, and different is polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts to be replaced with the terpolymer EP rubber (Jihua Group Co's resin synthesizes factory) of 100 weight parts.
Comparative Examples 3
Prescription and method by embodiment 5 prepare the flame retardant cable feed composition, and different is polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts to be replaced with the terpolymer EP rubber (Jihua Group Co's resin synthesizes factory) of 100 weight parts.
Performance test
According to the requirement in the following detection method the foregoing description 1-7 and Comparative Examples 1 and 2 prepared flame retardant cable feed compositions are injection molded into various battens and detect, the result is as shown in table 2.
Testing method is respectively: ASTM D638 (tensile strength and elongation at break), ASTM D2240 (shore hardness), UL94 (flame retardant test), the test of water tolerance cracking and smell test.Whether the method for described water tolerance cracking test is: prepare batten according to the requirement among the ASTM D638, this batten is put into normal temperature (23 ℃) water soaked 48 hours, observe the surface then and can ftracture.The method of smell property testing is: prepare batten according to the requirement among the ASTM D638, allow three people hear the size of judging smell respectively this batten, if think per capita for three and do not have smell, judge that then smell is a nothing, if thinking per capita for three has irritating smell, judge that then smell is an irritating smell.
Table 1
Table 2
In the result of table 2, compare with Comparative Examples by embodiment, shown that tensile strength, elongation at break and the shore hardness of the flame retardant cable that is made by flame retardant cable feed composition provided by the invention all is better than flame retardant cable of the prior art.Embodiment 1, embodiment 7 compare with Comparative Examples 1 and Comparative Examples 2 together, illustrate that being used of SEEPS and nucleator can make the tensile property of flame retardant cable of the present invention get a greater increase, and not significantly effect when nucleator cooperates terpolymer EP rubber, this has also illustrated to have collaborative effect between SEEPS and the nucleator.
Claims (15)
1. flame retardant cable feed composition, this flame retardant cable feed composition contains base-material, fire retardant and tenderizer, it is characterized in that, and described base-material contains polystyrene-poly [ethene-(ethylene-propylene)] multipolymer and polyolefine.
2. flame retardant cable feed composition according to claim 1, wherein, with respect to the base-material of 100 weight parts, the content of described fire retardant is the 35-115 weight part, the content of described tenderizer is the 10-50 weight part.
3. flame retardant cable feed composition according to claim 1 wherein, is a benchmark with the total amount of base-material, and the content of described polystyrene-poly [ethene-(ethylene-propylene)] multipolymer is 40-70 weight %, and described polyolefinic content is 30-60 weight %.
4. according to claim 1 or 3 described flame retardant cable feed compositions, wherein, the number-average molecular weight of described polystyrene-poly [ethene-(ethylene-propylene)] multipolymer is 5-25 ten thousand, and cinnamic content is the 25-40 weight % of multipolymer gross weight in this multipolymer.
5. according to claim 1 or 3 described flame retardant cable feed compositions, wherein, described polyolefine is polypropylene and/or polyethylene, and described polyolefine is 0.1-5g/10min 230 ℃ melting index.
6. flame retardant cable feed composition according to claim 1, wherein, described tenderizer is one or more in white oil, naphthenic oil, the paraffin oil.
7. flame retardant cable feed composition according to claim 1, wherein, described fire retardant is a phosphorus-nitrogen containing flame retardant.
8. flame retardant cable feed composition according to claim 7, wherein, also contain silicone master batch in this flame retardant cable feed composition, with respect to polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts, the content of described silicone master batch is the 2.5-40 weight part.
9. flame retardant cable feed composition according to claim 1, wherein, also contain nucleator in this flame retardant cable feed composition, with respect to polystyrene-poly [ethene-(the ethylene-propylene)] multipolymer of 100 weight parts, the content of described nucleator is the 0.3-2 weight part.
10. flame retardant cable feed composition according to claim 9, wherein, described nucleator is one or more in two (Ben Yajiaji) sorbyl alcohol, two (to the methylbenzene methylene radical) sorbyl alcohol, two (chlorine is replaced benzal) sorbyl alcohol, two (to the ethyl benzal) sorbyl alcohol, two (4 methyl-benzal) sorbyl alcohol, styryl sorbyl alcohol, two (3, the 4-dimethyl benzene methylene radical) sorbyl alcohol.
11. flame retardant cable feed composition according to claim 1, wherein, also contain antioxidant and/or photostabilizer in this flame retardant cable feed composition, polystyrene-poly [ethene-(ethylene-propylene)] multipolymer with respect to 100 weight parts, the content of described antioxidant is the 0.5-8 weight part, and the content of described photostabilizer is the 0.5-8 weight part.
12. flame retardant cable feed composition according to claim 11, wherein, described antioxidant is one or more in hindered phenol, nitrogen heterocyclic ring polyphenol, phosphorous acid ester, the monothioester; Described photostabilizer is one or more in salicylate, benzophenone, benzotriazole or the hindered amine.
13. the described fire-resistant cable material preparation of compositions of claim 1 method, this method comprises:
(1) with described polystyrene-poly [ethene-(ethylene-propylene)] multipolymer, polyolefine, fire retardant and tenderizer uniform mixing, obtains a kind of mixture;
(2) the mixture fusion that step (1) is obtained, extrude and granulation.
14. a flame retardant cable is characterized in that, this flame retardant cable is to be obtained by any described fire-resistant cable material preparation of compositions among the claim 1-12.
15. flame retardant cable according to claim 14, wherein, the method for described preparation comprises:
(1) with described fire-resistant cable material composition dries;
(2) the mixture fusion that step (1) is obtained and extruding.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104479213A (en) * | 2014-12-22 | 2015-04-01 | 陶铠高分子材料（上海）科技中心 | Vertically self-extinguishing, low-smoke and flame-retardant ceramic polymer composition and application thereof |
| CN108699304A (en) * | 2015-12-18 | 2018-10-23 | 耐克森公司 | Including with the polymer composition for improving polar dielectric fluid |
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2009
- 2009-12-07 CN CN2009102255964A patent/CN102086286A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104479213A (en) * | 2014-12-22 | 2015-04-01 | 陶铠高分子材料（上海）科技中心 | Vertically self-extinguishing, low-smoke and flame-retardant ceramic polymer composition and application thereof |
| CN108699304A (en) * | 2015-12-18 | 2018-10-23 | 耐克森公司 | Including with the polymer composition for improving polar dielectric fluid |
| US11254810B2 (en) | 2015-12-18 | 2022-02-22 | Nexans | Polymer composition comprising a dielectric liquid of improved polarity |
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Application publication date: 20110608 |