JP2017191657A - LAN cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a LAN cable which achieves both flame retardancy and low-temperature properties.SOLUTION: The LAN cable includes: insulated wires each having a conductor and an insulator arranged on the outer periphery of the conductor; and a sheath arranged on the outer periphery of the insulated wires. The insulator is formed of a resin composition containing a polyethylene having a dielectric constant of 2.5 or less. The sheath is formed of a resin composition containing a polyolefin-based resin and a flame retardant. The polyolefin-based resin contains 50 pts.mass or more of an ethylene-vinyl acetate copolymer based on 100 pts.mass of the polyolefin-based resin, and contains 10 pts.mass or more and 30 pts.mass or less of an acid-modified polyolefin resin having a glass transition temperature of -50°C or lower based on 100 pts.mass of the polyolefin-based resin. The flame retardant is contained in an amount of 220 pts.mass or more and 250 pts.mass or less based on 100 pts.mass of the polyolefin-based resin. The total oxygen index of the insulator and the sheath is 50.0 or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a LAN cable.

  With the advent of an advanced information society, the role played by networks centered on computer systems has become increasingly important. LAN cables used for local area network (LAN) construction are now widely used from homes and corporate offices to transportation facilities such as railway vehicles due to the spread of personal computers and broadband lines.

  Conventionally, polyvinyl chloride, a halogen-containing material, has been used as the sheath material for LAN cables, but due to the recent worldwide increase in environmental protection activities, no toxic gas is generated during combustion, and disposal The spread of non-halogen materials with little environmental pollution is rapidly advancing (for example, refer to Patent Documents 1 and 2 for non-halogen materials used in cables).

  However, since non-halogen materials are generally inferior in flame retardance as compared with halogen materials, it is difficult to develop non-halogen LAN cables having high flame retardancy. For example, LAN cables for railway vehicles are required by EN standards and the like. It has been difficult to develop a halogen-free LAN cable that satisfies the vertical tray combustion test (VTFT test).

Japanese Patent Laying-Open No. 2015-4025 Japanese Patent Laying-Open No. 2015-166867

  In order to impart high flame retardancy to the non-halogen material, it is necessary to fill a large amount of metal hydroxide such as magnesium hydroxide or aluminum hydroxide. In addition, in the use of LAN cables for railway vehicles, the sheath material shrinks and affects the dielectric properties of the insulator in a sheath material that has a wide operating temperature range and a large shrinkage at low temperatures compared to a household LAN cable. High filling of inorganic substances is required.

  For this reason, an amorphous polymer is used as the polymer, which has little deterioration in properties due to high filling. As an amorphous polymer, polymers composed of carbon and hydrogen atoms such as EP rubber and EOR (nonpolar polymer), carbon such as ethylene vinyl acetate copolymer (EVA) and ethylene ethyl acrylate (EEA), Although there is a polymer (polar polymer) composed of hydrogen and oxygen, the latter has a higher flame retardancy than the latter, and therefore, for example, EVA is used in highly flame retardant applications.

  Since the amorphous nature of EVA increases as the vinyl acetate content (VA amount) increases, it is preferable to use EVA with a VA amount of 20% or more, for example, in highly flame-retardant applications. However, since EVA has a glass transition temperature that is not so dependent on the amount of VA and is as high as −25 ° C. to −30 ° C., properties such as elongation at low temperature and winding are deteriorated. For this reason, in a vehicle LAN cable that is required to be used at −40 ° C. or lower, it is difficult to achieve both flame retardancy and low temperature.

  An object of the present invention is to provide a LAN cable that achieves both flame retardancy and low temperature.

According to one aspect of the present invention,
An insulated wire having a conductor and an insulator disposed on an outer periphery of the conductor;
A sheath disposed on the outer periphery of the insulated wire;
Have
The insulator is formed of a resin composition containing polyethylene having a relative dielectric constant of 2.5 or less,
The sheath is formed of a resin composition containing a polyolefin resin and a flame retardant,
The polyolefin resin contains an ethylene-vinyl acetate copolymer in an amount of 50 parts by mass or more based on 100 parts by mass of the polyolefin resin, and an acid-modified polyolefin resin having a glass transition temperature of −50 ° C. or less. Containing 10 parts by weight to 30 parts by weight with respect to 100 parts by weight,
The flame retardant is contained in an amount of 220 to 250 parts by mass with respect to 100 parts by mass of the polyolefin resin,
A LAN cable is provided in which the sum of oxygen index of the insulator and the sheath is 50.0 or more.

  A LAN cable that achieves both flame retardancy and low temperature is obtained.

FIG. 1 is a schematic cross-sectional view of a LAN cable according to an embodiment of the present invention.

  Referring to FIG. 1, a local area network (LAN) cable 100 according to an embodiment of the present invention will be described. FIG. 1 is a schematic cross-sectional view of the LAN cable 100.

  The LAN cable 100 includes an insulated wire 10 and a sheath 40 disposed on the outer periphery of the insulated wire 10 via a resin tape layer 20 and a shield layer 30.

  The insulated wire 10 includes a conducting wire 11 and an insulator 12 disposed on the outer periphery of the conducting wire 11. As the conducting wire 11, for example, a copper conducting wire can be used. The material and structure of the conducting wire 11 can be appropriately selected as necessary.

The insulator 12 is formed of a resin composition containing polyethylene. The polyethylene used for the insulator 12 is not particularly limited as long as the relative dielectric constant is 2.5 or less. For example, the low-density polyethylene (LDPE), the linear low-density polyethylene (LLDPE), and the linear ultra-low-density polyethylene. (VLDPE) and high density polyethylene (HDPE) can be mentioned, and low density polyethylene is preferable, and low density polyethylene having a density of 0.930 g / cm ³ or less and MFR of 0.30 g / 10 min or less is more preferable. These polyethylenes can be used alone or in combination of two or more.

  If necessary, additives such as an antioxidant, a copper damage inhibitor, and a colorant may be added to the resin composition forming the insulator 12. The addition amount of the additive is not particularly limited as long as it is added so that the dielectric constant of the insulator 12 is 2.5 or less, but is preferably 5% by mass or less, and more preferably 1% by mass or less. If the dielectric constant of the insulator 12 is greater than 2.5, the capacitance increases, and the transmission characteristics as a LAN cable are significantly degraded.

  A plurality of insulated wires 10 are twisted together to form a unit 13. In the example shown in FIG. 1, a four-core unit 13 in which four insulated wires 10 are twisted together is formed.

  A resin tape layer 20 is disposed on the outer periphery of the unit 13. The resin tape layer 20 is formed by wrapping a resin tape, such as an aluminum laminated PET tape, around the outer periphery of the unit 13.

  A shield layer 30 is disposed on the outer periphery of the resin tape layer 20. That is, the shield layer 30 is disposed on the outer periphery of the unit 13. The shield layer 30 is formed of a metal material, for example, a copper braid.

  A sheath 40 is disposed on the outer periphery of the shield layer 30. That is, the sheath 40 is disposed on the outer periphery of the insulated wire 10. The sheath 40 is formed of a resin composition containing a polyolefin-based resin and a flame retardant.

  The polyolefin resin used for the resin composition forming the sheath 40 (hereinafter sometimes simply referred to as polyolefin resin) contains 50 parts by mass or more of ethylene vinyl acetate copolymer with respect to 100 parts by mass of the polyolefin resin. In addition, an acid-modified polyolefin resin having a glass transition temperature of −50 ° C. or less is contained in an amount of 10 to 30 parts by mass with respect to 100 parts by mass of the polyolefin resin.

  The ethylene vinyl acetate copolymer (EVA) is preferably contained in an amount of 50 parts by mass or more, based on 100 parts by mass of the polyolefin resin, as a base polymer that is the main component of the polyolefin resin. It is more preferable. Although it does not specifically limit as vinyl acetate amount (VA amount) of EVA, For example, 20 mass% or more and 50 mass% or less are preferable, and 25 mass% or more and 46 mass% or less are more preferable. As EVA, it can be used individually or by blending two or more kinds of EVA. The VA amount when two or more kinds of EVA are blended is an average VA amount. The amount of VA is preferably 20% by mass or more, and more preferably 25% by mass or more. This is because if the amount of VA is less than 20% by mass, it is difficult to obtain high flame retardancy. Further, the VA amount is preferably 50% by mass or less, and more preferably 46% by mass or less. This is because if the amount of VA is more than 50% by mass, the tensile strength tends to decrease.

  The acid-modified polyolefin is preferably contained in an amount of 10 to 30 parts by mass with respect to 100 parts by mass of the polyolefin resin. If the addition amount of the acid-modified polyolefin is less than 10 parts by mass, sufficient low-temperature properties cannot be obtained, and if it is more than 30 parts by mass, the adhesion between the polymer and the filler becomes too strong and the elongation characteristics deteriorate.

  As the acid-modified polyolefin, those having a glass transition point (Tg) by a differential scanning calorimetry (DSC) method of −50 ° C. or less are preferred, and those having a glass transition temperature of −60 ° C. or less are more preferred. This is because an acid-modified polyolefin having a Tg higher than −50 ° C. cannot provide sufficient low temperature properties. As the acid-modified polyolefin, for example, maleic acid-modified polyolefin is used.

  If necessary, other polymers may be added to the polyolefin resin used in the resin composition forming the sheath 40. Other polymers include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), linear very low density polyethylene (VLDPE), high density polyethylene (HDPE), polypropylene (PP), ethylene-acrylic acid. Ethyl copolymer (EEA), ethylene-styrene copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-butene-1 copolymer, ethylene-butene-hexene terpolymer, ethylene-propylene-diene Original copolymer (EPDM), ethylene-octene copolymer (EOR), ethylene copolymer polypropylene, ethylene-propylene copolymer (EPR), poly-4-methyl-pentene-1, maleic acid grafted low density polyethylene, Hydrogenated styrene-butadiene copolymer (H-SBR), Rain-acid grafted linear low density polyethylene, copolymer of ethylene and α-olefin having 4 to 20 carbon atoms, ethylene-styrene copolymer, maleic acid grafted ethylene-methyl acrylate copolymer, maleic acid grafted ethylene- Vinyl acetate copolymer, ethylene-maleic anhydride copolymer, ethylene-ethyl acrylate-maleic anhydride terpolymer, ethylene-propylene-butene-1 terpolymer mainly containing butene-1 These may be used alone or in combination of two or more.

  The flame retardant used for the resin composition forming the sheath 40 is preferably contained in an amount of 220 parts by mass or more and 250 parts by mass or less with respect to 100 parts by mass of the polyolefin resin. This is because if the addition amount of the flame retardant is less than 220 parts by mass, the flame retardancy becomes insufficient, and if it is more than 250 parts by mass, the elongation characteristics are remarkably lowered. In addition, the transmission characteristic in low temperature can be made favorable by the addition amount of a flame retardant being 200 mass parts or more.

  Flame retardants include metal hydroxides such as magnesium hydroxide, aluminum hydroxide and calcium hydroxide, amorphous silica, zinc stannate, zinc hydroxystannate, zinc borate, zinc oxide and other zinc compounds, boron Boric acid compounds such as calcium oxide, barium borate, barium metaborate, nitrogen-based flame retardants such as phosphorus flame retardant melamine cyanurate, or intimate system consisting of a mixture of components that foam and solidify during combustion A flame retardant is mentioned, More preferably, a metal hydroxide is used, More preferably, magnesium hydroxide is used. These flame retardants can be used alone or in combination of two or more. For example, magnesium hydroxide and aluminum hydroxide can be used in combination. As the flame retardant, a silane coupling agent, a titanate coupling agent, a fatty acid such as stearic acid or calcium stearate, or a surface treated with a fatty acid metal salt may be used.

  The resin composition forming the sheath 40 includes, in addition to the polyolefin resin and the flame retardant, an antioxidant, a metal deactivator, a cross-linking agent, a cross-linking aid, a lubricant, an inorganic filler, and a compatibilizing agent as necessary. Additives such as stabilizers, carbon black, and colorants may be added. The resin composition forming the sheath 40 may be crosslinked by an organic peroxide or by radiation such as an electron beam.

  Although it does not specifically limit as antioxidant, For example, a phenol type, sulfur type, amine type, and phosphorus type antioxidant are mentioned. For example, the type of phenolic antioxidant is not particularly limited. For example, dibutylhydroxytoluene (BHT), pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], 1,3,5-tris (3,5-di-t-butyl-4-hydroxy-benzyl) -S-triazine-2,4,6- (1H, 3H, 5H) trione, thiodiethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and the like, more preferably pentaerythritol tetrakis [3-3,5-di-tert-butyl-4-hydroxyphenyl) propionate]. It is. For example, the type of sulfur-based antioxidant is not particularly limited, but didodecyl 3,3′-thiodipropionate, ditridecyl 3,3′-thiodipropionate, dioctadecyl 3,3′-thiodipropioate. And tetrakis [methylene-3- (dodecylthio) propionate] methane, and more preferably tetrakis [methylene-3- (dodecylthio) propionate] methane. These antioxidants can be used alone or in combination of two or more.

  The metal deactivator has an effect of stabilizing metal ions by chelate formation and suppressing oxidative degradation, and its structure is not particularly limited. For example, N- (2H-1,2,4-triazol-5-yl) Salicylamide, dodecanedioic acid bis [N2- (2-hydroxybenzoyl) hydrazide], 2 ', 3-bis [[3- [3,5-di-tert-butyl-4-hydroxyphenyl] propionyl]] propiono Examples thereof include hydrazide and the like, and 2 ′, 3-bis [[3- [3,5-di-tert-butyl-4-hydroxyphenyl] propionyl]] propionohydrazide is more preferable.

  Although it does not specifically limit as a crosslinking adjuvant, For example, use of trimeterol propane trimethacrylate (TMPT) and triallyl isocyanurate (TAIC) is desirable.

  Examples of the lubricant include, but are not limited to, fatty acids, fatty acid metal salts, fatty acid amides, and the like. Specifically, use of zinc stearate can be mentioned, and these can be used alone or in combination of two or more.

  Carbon black is not particularly limited, but carbon black for rubber (N900-N100: ASTM D 1765-01) is generally used.

  Although it does not specifically limit as a coloring agent, The color masterbatch for non-halogens etc. can be used.

  In order to obtain sufficient flame retardancy of the LAN cable 100, the insulator 12 and the sheath 40 are configured such that the total oxygen index of the insulator 12 and the sheath 40 is 50.0 or more.

Here, the oxygen index is measured by a method according to JIS K 6269, and the total value of the oxygen index of the insulator 12 and the sheath 40 is obtained by the following equation.
(Oxygen index of total) _{= (X 1 V} 1 Ten _{X 2 V 2) / (V} 1 + V 2)
X ₁ : Insulator oxygen index V ₁ : Insulator area X ₂ : Sheath oxygen index V ₂ : Sheath area of cable cross section

  The LAN cable of the example and the comparative example was manufactured by changing the composition of the insulator material and the sheath material, and the sheath characteristics and the cable characteristics were evaluated. Table 1 shows the composition and evaluation of materials for the examples and Table 2 for the comparative examples.

  A method for manufacturing a LAN cable will be described. As materials for the insulator and sheath, various components are blended at the blending ratios shown in Table 1 for Examples and Table 2 for Comparative Examples, and kneaded at a start temperature of 40 ° C and an end temperature of 190 ° C by a pressure kneader. Then, the kneaded material was used as pellets.

  An insulated wire was fabricated by coating an tin-plated copper conductor wire having an outer diameter of 0.78 mm with an insulator material having a thickness of 0.3 mm and forming an insulator by crosslinking with an electron beam with a dose of 7 MRad. A resin tape layer was formed by winding aluminum insulated PET tape with 1/4 wrap around a twisted four insulated wires, and a shield layer was formed by covering the resin tape layer with a copper braid. A LAN cable was manufactured by covering the shield layer with a sheath material with a thickness of 1.1 mm and forming a sheath by cross-linking by irradiation with an electron beam with a dose of 13 MRad.

  A test method for the sheath and the LAN cable will be described.

<Sheath test method>
Only the sheath material was peeled off from the produced LAN cable, punched out into a No. 6 dumbbell test piece, and the following tests were performed to evaluate the characteristics of the sheath.

(1) Tensile test In accordance with JIS C 3005, a tensile test was performed under the condition of a tensile speed of 200 mm / min. About elongation, the thing of less than 125% was made into x (failure), and the thing of 125% or more was made into (circle) (pass). About tensile strength, the thing below 10 Mpa was set to x (failure), and the thing more than 10 Mpa was set to (circle) (pass).

(2) Low temperature test (sheath material)
According to EN60881-1-4, a tensile test was performed at −40 ° C. under a tensile speed of 25 mm / min. Those having an elongation characteristic of 30% or more were evaluated as ◯ (passed), and those having an elongation characteristic of less than 30% were evaluated as x (failed).

<LAN cable test method>
The characteristics of the LAN cable were evaluated by the following tests.

(3) Low temperature test (cable)
In accordance with EN60881-1-4 8.1, a bending test was performed at −40 ° C. Those in which no cracks occurred after winding were evaluated as “◯” (accepted), and those in which cracks occurred were evaluated as “x” (failed).

(4) Flame Retardancy Test A VTFT test was performed in accordance with IEEE standard 1202. A cable with a damage distance of 1.5 m or less was marked as “◯” (accepted), a cable with a distance of 1.3 m or less was marked as “◎” (passed with tolerance), and a cable greater than 1.5 m was marked “x” (failed). .

(5) Transmission characteristic test In accordance with JIS X 5150 and TIA-568-C, 2, a capacitance test and a near-end crosstalk attenuation test at -40 ° C were performed. For the capacitance test, a value of 5.6 nF / 100 m or less was evaluated as ◯ (passed), and a value larger than that was evaluated as x (failed). For the near-end crosstalk attenuation test, measurement is performed between a pair of four insulators, and a value of 65.3 dB or more at a frequency of 1 MHz and 35.3 dB or more at a frequency of 100 MHz is set to be “good” (smaller). The thing was made into x (failed).

  The test results of the sheath characteristics and cable characteristics will be described.

  In Examples 1 to 9, the sheath characteristics and the cable characteristics all show good results.

  In Example 2, an antioxidant was added to the insulator material, but the characteristics were good as long as the relative dielectric constant was within the specified range (2.5 or less).

  In Examples 1, 3 and 4, the VA amount of EVA, which is the base polymer of the sheath material, was changed, but all of the characteristics were good. When EVA having a VA amount of 25% by mass or more is used as a base, the flame retardancy test has passed with a margin, and in a product requiring high flame retardancy, a VA amount of 25% by mass or more is preferable.

  In Example 5, a small amount of LDPE was added to EVA, which is a base polymer of the sheath material, but the characteristics were good. In this way, other polyolefins may be added as long as the sheath material is in a trace amount.

  In Examples 6-7, although the addition amount of acid-modified polyolefin was changed, the characteristic was favorable if it was in the prescribed range (10 mass parts or more and 30 mass parts or less). When the addition amount of the acid-modified polyolefin is small, the sheath has excellent elongation characteristics, and when the addition amount is large, the sheath has excellent tensile strength characteristics.

  In Examples 8 and 9, the amount of magnesium hydroxide, which is a flame retardant for the sheath material, was increased. However, as long as the amount added was within the specified range (220 parts by mass or more and 250 parts by mass or less), the characteristics were all good. Met. Further, the damage distance in the flame retardancy test tended to be shorter as the amount of magnesium hydroxide was increased.

  On the other hand, in Comparative Example 1, the relative permittivity of the insulator was larger than specified, and the capacitance was rejected.

  In Comparative Example 2, the amount of acid-modified polyolefin added to the sheath material was less than specified, and the low temperature test of the sheath material failed.

  In Comparative Example 3, the amount of acid-modified polyolefin added was larger than specified, and the elongation characteristics were unacceptable.

  In Comparative Examples 4 and 5, the amount of flame retardant added to the sheath material was less than specified, Comparative Example 4 failed in flame retardancy and near-end crosstalk attenuation at −40 ° C., and Comparative Example 5 was flame retardant. Sex was rejected.

  In order to pass the near-end crosstalk attenuation at −40 ° C., the amount of flame retardant added is preferably 200 parts by mass or more. Thus, the flame retardant also functions as a component for improving transmission characteristics at low temperatures, and setting the amount of addition of the flame retardant to 220 parts by mass or more improves both transmission characteristics at low temperatures and flame retardancy. It is preferable to make it good.

  In Comparative Example 6, the amount of flame retardant added to the sheath material was more than specified, and the elongation characteristics were unacceptable.

  As described above, it is possible to manufacture a non-halogen LAN cable that achieves both flame retardancy and low temperature. Such a LAN cable can be used for various applications, and in particular, can be preferably used as a LAN cable for railway vehicles.

  In the above-described embodiment, a four-core LAN cable is exemplified. However, if the total of the oxygen index of the green body and the sheath is within a specified range (50.0 or more), the above-described embodiment is used. Insulator materials and sheath materials such as those described above may be applied to LAN cables having two cores or other structures.

  As mentioned above, although this invention was demonstrated along embodiment, this invention is not restrict | limited to these. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

  Hereinafter, preferred embodiments of the present invention will be additionally described.

(Appendix 1)
An insulated wire having a conductor and an insulator disposed on an outer periphery of the conductor;
A sheath disposed on the outer periphery of the insulated wire;
Have
The insulator is formed of a resin composition containing polyethylene having a relative dielectric constant of 2.5 or less,
The sheath is formed of a resin composition containing a polyolefin resin and a flame retardant,
The polyolefin resin contains an ethylene-vinyl acetate copolymer in an amount of 50 parts by mass or more based on 100 parts by mass of the polyolefin resin, and an acid-modified polyolefin resin having a glass transition temperature of −50 ° C. or less. Containing 10 parts by weight to 30 parts by weight with respect to 100 parts by weight,
The flame retardant is contained in an amount of 220 to 250 parts by mass with respect to 100 parts by mass of the polyolefin resin,
The LAN cable, wherein a sum of oxygen indexes of the insulator and the sheath is 50.0 or more.

(Appendix 2)
The LAN cable according to supplementary note 1, wherein the vinyl acetate content of the ethylene vinyl acetate copolymer is preferably 20% by mass or more and 50% by mass or less, and more preferably 25% by mass or more and 46% by mass or less.

(Appendix 3)
The LAN cable according to appendix 1 or 2, wherein at least one of magnesium hydroxide and aluminum hydroxide is used as the flame retardant.

(Appendix 4)
Other insulated wires having other conductors and other insulators disposed on the outer periphery of the other conductors;
A shield layer disposed on the outer periphery of the unit in which the insulated wires and the other insulated wires are twisted together, and
The LAN cable according to any one of appendices 1 to 3, wherein the sheath is disposed on an outer periphery of the shield layer.

(Appendix 5)
The insulated wire and the other insulated wires are twisted together by adding 220 parts by mass or more of the flame retardant as a component for improving transmission characteristics at low temperature with respect to 100 parts by mass of the polyolefin resin. In a near-end crosstalk attenuation test at −40 ° C. according to TIA-568-C, 2 measured for the pair, the frequency is 65.3 dB or more at a frequency of 1 MHz and 35.3 dB or more at a frequency of 100 MHz. The LAN cable according to appendix 4, which has characteristics.

10 Insulated Wire 11 Conductor 12 Insulator 20 Resin Tape Layer 30 Shield Layer 40 Sheath 100 LAN Cable

Claims (3)

An insulated wire having a conductor and an insulator disposed on an outer periphery of the conductor;
A sheath disposed on the outer periphery of the insulated wire;
Have
The insulator is formed of a resin composition containing polyethylene having a relative dielectric constant of 2.5 or less,
The sheath is formed of a resin composition containing a polyolefin resin and a flame retardant,
The polyolefin resin contains an ethylene-vinyl acetate copolymer in an amount of 50 parts by mass or more based on 100 parts by mass of the polyolefin resin, and an acid-modified polyolefin resin having a glass transition temperature of −50 ° C. or less. Containing 10 parts by weight to 30 parts by weight with respect to 100 parts by weight,
The flame retardant is contained in an amount of 220 to 250 parts by mass with respect to 100 parts by mass of the polyolefin resin,
The LAN cable, wherein a sum of oxygen indexes of the insulator and the sheath is 50.0 or more.   2. The LAN cable according to claim 1, wherein the ethylene vinyl acetate copolymer has a vinyl acetate content of 20% by mass or more and 50% by mass or less.   The LAN cable according to claim 1 or 2, wherein at least one of magnesium hydroxide and aluminum hydroxide is used as the flame retardant.

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