Resin composition, electric wire, and cable

Abstract

This resin composition contains: a copolymer of a constitutional unit derived from ethylene and a constitutional unit derived from an α-olefin that has a carbonyl group; a bromine-based flame retardant; and antimony trioxide. In this resin composition, the content of the copolymer is 20 mass% to 60 mass% inclusive. In this resin composition, the content of the bromine-based flame retardant is 10 mass% to 30 mass% inclusive. In this resin composition, the content of the antimony trioxide is 2 mass% to 15 mass% inclusive. This resin composition additionally contains at least two compounds that are selected from the group consisting of a first compound, a second compound, and a third compound. In this resin composition, the respective contents of the at least two compounds that are selected from the group consisting of the first compound, the second compound, and the third compound are each 0.01 mass% to 1.5 mass% inclusive. The highest absorption peak in the ultraviolet absorption spectrum of the first compound is present in the range of 320 nm to 360 nm inclusive, the highest absorption peak in the ultraviolet absorption spectrum of the second compound is present in the range of not less than 275 nm but less than 320 nm, and the highest absorption peak in the ultraviolet absorption spectrum of the third compound is present in the range of not less than 240 nm but less than 275 nm.

Description

Resin composition, electric wire, and cable

[0001] The present disclosure relates to a resin composition, an electric wire, and a cable.

[0002] Conventionally, "electric wires having a conductor and a coating covering the conductor" and "cables having a core wire and a coating layer covering the core wire" have been used in automobiles and the like, and "resin compositions containing a copolymer of structural units derived from ethylene and structural units derived from an α-olefin having a carbonyl group, a brominated flame retardant, and antimony trioxide" have been used as materials for the coating and the coating layer (Patent Document 1).

[0003] International Publication No. 2015 / 159788

[0004] The resin composition of the present disclosure comprises a copolymer of structural units derived from ethylene and structural units derived from an α-olefin having a carbonyl group, a brominated flame retardant, and antimony trioxide, wherein the content of the copolymer in the resin composition is 20% by mass or more and 60% by mass or less, the content of the brominated flame retardant in the resin composition is 10% by mass or more and 30% by mass or less, the content of the antimony trioxide in the resin composition is 2% by mass or more and 15% by mass or less, the resin composition further comprises at least two compounds selected from the group consisting of a first compound, a second compound, and a third compound, the content of each of the at least two compounds selected from the group consisting of the first compound, the second compound, and the third compound is 0.01% by mass or more and 1.5% by mass or less, the highest absorption peak in the ultraviolet absorption spectrum of the first compound is in the region of 320 nm or more and 360 nm or less, The second compound has an ultraviolet absorption spectrum with the highest absorption peak in the region of 275 nm or more and less than 320 nm, and the third compound has an ultraviolet absorption spectrum with the highest absorption peak in the region of 240 nm or more and less than 275 nm.

[0005] Fig. 1 is a schematic perspective view of an electric wire according to an embodiment of the present disclosure. Fig. 2 is a schematic cross-sectional view taken along II-II in Fig. 1. Fig. 3 is a schematic view illustrating a part of an evaluation method for a heat resistance test. Fig. 4 is a schematic view illustrating a part of an evaluation method for a flame retardancy test. Fig. 5 is a schematic view illustrating a part of an evaluation method for a tensile test. Fig. 6 is a schematic cross-sectional view showing the configuration of a cable according to an embodiment of the present disclosure.

[0006] [Problem to be Solved by the Present Disclosure] When electric wires and cables are used in applications such as automobiles, the conditions under which the electric wires and cables are used can be severe. In particular, under conditions of high temperature and susceptibility to weather-related factors (such as sunlight), the electric wires and cables are prone to deterioration due to temperature and these factors. Therefore, there is a need for improved heat resistance, flame retardancy, and resistance to these factors (in other words, "weather resistance"). Furthermore, there is a need for excellent "elongation" as a property of the electric wires and cables. Regarding heat resistance and flame retardancy, it is known that the heat resistance and flame retardancy of electric wires and cables can be improved by including a resin composition containing a copolymer of structural units derived from ethylene and structural units derived from an α-olefin having a carbonyl group, a brominated flame retardant, and antimony trioxide. However, when the resin composition contains a brominated flame retardant and antimony trioxide, while the heat resistance and flame retardancy of the electric wire are easily improved, the elongation of the electric wire or cable may be easily insufficient.

[0007] Furthermore, with regard to weather resistance, because sunlight contains light with wavelengths in the ultraviolet range, it is necessary to improve weather resistance by making the coating or coating layer of an electric wire more likely to absorb ultraviolet light with a wavelength of 400 nm or less. One known method for making the coating or coating layer of an electric wire more likely to absorb ultraviolet light with a wavelength of 400 nm or less is to use carbon black or the like as a raw material for the coating or coating layer to make the coating or coating layer black. Meanwhile, there have been cases where it has been desired to make the coating or coating layer a color other than black. However, no ultraviolet absorber has been known that can make the coating or coating layer a color other than black and enable the coating or coating layer of an electric wire to more likely absorb ultraviolet light with a wavelength of 400 nm or less. For this reason, it has sometimes been difficult to impart excellent weather resistance to electric wires or cables, for example, when it is desired to make the coating or coating layer a color other than black. Therefore, there has been a need for a method other than making the coating black to impart excellent weather resistance to electric wires and cables.

[0008] For these reasons, it has sometimes been difficult to impart excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance to electric wires and cables. Therefore, the present disclosure aims to provide a resin composition that enables the production of an electric wire that combines excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance, as well as the electric wire and a cable including the electric wire. In the present disclosure, "weather resistance" refers to durability against weather-related factors (such as sunlight).

[0009] [Effects of the Present Disclosure] According to the present disclosure, it is possible to provide a resin composition that enables the production of an electric wire and a cable that combine excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance, as well as the electric wire and the cable.

[0010] [Description of Embodiments of the Present Disclosure] First, embodiments of the present disclosure will be listed and described. (1) A resin composition of the present disclosure comprises a copolymer of structural units derived from ethylene and structural units derived from an α-olefin having a carbonyl group, a brominated flame retardant, and antimony trioxide, wherein the content of the copolymer in the resin composition is 20% by mass or more and 60% by mass or less, the content of the brominated flame retardant in the resin composition is 10% by mass or more and 30% by mass or less, the content of the antimony trioxide in the resin composition is 2% by mass or more and 15% by mass or less, the resin composition further comprises at least two compounds selected from the group consisting of a first compound, a second compound, and a third compound, the content of each of the at least two compounds selected from the group consisting of the first compound, the second compound, and the third compound in the resin composition is 0.01% by mass or more and 1.5% by mass or less, the highest absorption peak in the ultraviolet absorption spectrum of the first compound is in the region of 320 nm or more and 360 nm or less, The second compound has an ultraviolet absorption spectrum with the highest absorption peak in the region of 275 nm or more and less than 320 nm, and the third compound has an ultraviolet absorption spectrum with the highest absorption peak in the region of 240 nm or more and less than 275 nm.

[0011] According to the present disclosure, it is possible to provide a resin composition that enables the production of an electric wire and a cable that combine excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance, as well as the electric wire and the cable.

[0012] (2) In the above (1), the first compound may be a compound represented by the following formula 1, the second compound may be a compound represented by the following formula 2, and the third compound may be a compound represented by the following formula 3. This makes it possible to provide a resin composition that enables the production of an electric wire and cable that combine better heat resistance, better flame retardancy, better elongation, and better weather resistance, as well as the electric wire and the cable.

[0013] In the formula 1, R １is a hydrogen atom or a halogen atom, and R ２ is a hydrogen atom or a hydrocarbon group, and R ３ is a hydrogen atom or a hydrocarbon group.

[0014]

[0015] In the formula 3, R ４ is a hydrocarbon group.

[0016] (3) In the above (2), the R １ is a hydrogen atom or a chlorine atom, and the R ２ is a hydrogen atom, a methyl group, or a group represented by the following formula 1d, ３ may be a hydrogen atom or a group represented by the following formula 1e: This makes it possible to provide a resin composition that enables the production of an electric wire and cable that have superior heat resistance, superior flame retardancy, superior elongation, and superior weather resistance, as well as the electric wire and cable.

[0017]

[0018]

[0019] (4) In any of the above (1) to (3), the first compound may be at least one compound selected from the group consisting of compounds represented by the following formula 1a, compounds represented by the following formula 1b, and compounds represented by the following formula 1c. This makes it possible to provide a resin composition that enables the production of an electric wire and cable that combine better heat resistance, better flame retardancy, better elongation, and better weather resistance, as well as the electric wire and the cable.

[0020]

[0021]

[0022]

[0023] (5) In the above (4), the first compound may be a compound represented by formula 1a. This makes it possible to provide a resin composition that enables the production of an electric wire and a cable that have superior heat resistance, superior flame retardancy, superior elongation, and superior weather resistance, as well as the electric wire and the cable.

[0024] (6) In any of the above (1) to (5), the R ４ may be a hydrocarbon group having 4 or more carbon atoms. This makes it possible to provide a resin composition that enables the production of an electric wire and cable that have superior heat resistance, superior flame retardancy, superior elongation, and superior weather resistance, as well as the electric wire and cable.

[0025] (7) In any of the above (1) to (6), the R ４ is a linear -C １６ H ３３ This makes it possible to provide a resin composition that enables the production of an electric wire and a cable that have superior heat resistance, superior flame retardancy, superior elongation, and superior weather resistance, as well as the electric wire and the cable.

[0026] (8) In any of the above (1) to (7), the resin composition may further contain a hindered amine light stabilizer, the hindered amine light stabilizer being a compound having a structure represented by the following formula 4, and the content of the hindered amine light stabilizer in the resin composition may be 0.1% by mass or more and 1.5% by mass or less. This makes it possible to provide a resin composition that enables the production of an electric wire and cable that combine better heat resistance, better flame retardancy, better elongation, and better weather resistance, as well as the electric wire and cable.

[0027]

[0028] (9) In the above (8), the hindered amine light stabilizer may be a compound having a structural unit represented by the following formula 4a: This makes it possible to provide a resin composition that enables the production of an electric wire and cable that combine better heat resistance, better flame retardancy, better elongation, and better weather resistance, as well as the electric wire and cable.

[0029]

[0030] (10) The electric wire of the present disclosure is an electric wire including a conductor and a coating covering the conductor, wherein the coating includes a first layer, and the first layer is made of the resin composition described in (1) to (9) above.

[0031] This makes it possible to provide an electric wire that has excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance.

[0032] (11) The cable of the present disclosure is a cable comprising a core wire and a coating layer coating the core wire, wherein the core wire includes a plurality of electric wires, the coating layer includes a first A layer, the first A layer is located on the surface of the coating layer, and the first A layer is made of a resin composition described in (1) to (9) above.

[0033] This makes it possible to provide a cable that combines excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance.

[0034] [Details of the embodiment of the present disclosure] Specific examples of a resin composition, an electric wire, and a cable according to one embodiment of the present disclosure (hereinafter also referred to as "the present embodiment") will be described below with reference to the drawings. In the drawings of the present disclosure, the same reference symbols represent the same or corresponding parts. Furthermore, dimensional relationships such as length, width, thickness, and depth have been changed as appropriate for clarity and simplification of the drawings, and do not necessarily represent actual dimensional relationships.

[0035] In the present disclosure, the notation in the form of "A to B" means the upper and lower limits of a range (i.e., A or more and B or less), and when no unit is specified for A and a unit is specified only for B, the units of A and B are the same.

[0036] In the present disclosure, when a compound or the like is represented by a chemical formula, unless the atomic ratio is particularly limited, it is intended to include any conventionally known atomic ratio, and should not necessarily be limited to only those within the stoichiometric range.

[0037] [Embodiment 1: Resin Composition] A resin composition according to an embodiment of the present disclosure will be described. One embodiment of the present disclosure (hereinafter also referred to as "the present embodiment") is a resin composition comprising: a copolymer of structural units derived from ethylene and structural units derived from an α-olefin having a carbonyl group; a brominated flame retardant; and antimony trioxide, wherein the content of the copolymer in the resin composition is 20% by mass or more and 60% by mass or less; the content of the brominated flame retardant in the resin composition is 10% by mass or more and 30% by mass or less; the content of the antimony trioxide in the resin composition is 2% by mass or more and 15% by mass or less; the resin composition further comprises at least two compounds selected from the group consisting of a first compound, a second compound, and a third compound; the content of each of the at least two compounds selected from the group consisting of the first compound, the second compound, and the third compound is 0.01% by mass or more and 1.5% by mass or less; the highest absorption peak in the ultraviolet absorption spectrum of the first compound is in the region of 320 nm or more and 360 nm or less; The second compound has an ultraviolet absorption spectrum with the highest absorption peak in the region of 275 nm or more and less than 320 nm, and the third compound has an ultraviolet absorption spectrum with the highest absorption peak in the region of 240 nm or more and less than 275 nm.

[0038] According to the present disclosure, it is possible to provide a resin composition that enables the production of an electric wire and a cable that combine excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance, and the electric wire and the cable. The reason for this is presumed to be as follows.

[0039] (a) The resin composition of this embodiment comprises a copolymer of structural units derived from ethylene and structural units derived from an α-olefin having a carbonyl group, a brominated flame retardant, and antimony trioxide, wherein the content of the copolymer in the resin composition is 20% by mass or more and 60% by mass or less, the content of the brominated flame retardant in the resin composition is 10% by mass or more and 30% by mass or less, and the content of the antimony trioxide in the resin composition is 2% by mass or more and 15% by mass or less. Since the brominated flame retardant and antimony trioxide are contained in the copolymer in appropriate amounts, the resin composition can be used to produce electric wires and cables that have excellent elongation in addition to excellent heat resistance and excellent flame retardancy.

[0040] (b) The resin composition further contains at least two compounds selected from the group consisting of a first compound, a second compound, and a third compound, and the content of each of the at least two compounds selected from the group consisting of the first compound, the second compound, and the third compound in the resin composition is 0.01% by mass or more and 1.5% by mass or less, the highest absorption peak in the ultraviolet absorption spectrum of the first compound is in the range of 320 nm to 360 nm, the highest absorption peak in the ultraviolet absorption spectrum of the second compound is in the range of 275 nm to less than 320 nm, and the highest absorption peak in the ultraviolet absorption spectrum of the third compound is in the range of 240 nm to less than 275 nm. This makes it possible to easily absorb ultraviolet light over a wide range in the wavelength region of 400 nm or less, and makes it possible to produce electric wires and cables with excellent weather resistance using the resin composition.

[0041] As a result, it is possible to provide a resin composition that enables the production of an electric wire and a cable that combine excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance, as well as the electric wire and the cable including the electric wire.

[0042] <Copolymer> The resin composition contains a copolymer of a structural unit derived from ethylene and a structural unit derived from an α-olefin having a carbonyl group. In the resin composition, the content of the copolymer is 20% by mass or more and 60% by mass or less. In the resin composition, the content of the copolymer may be 22% by mass or more and 55% by mass or less, or may be 25% by mass or more and 50% by mass or less. Here, "structural unit" refers to a repeating unit that constitutes a polymer. A polymer is constituted by the repeated bonding of the same or different structural units, excluding the terminals.

[0043] In the resin composition, the content of the copolymer of structural units derived from ethylene and structural units derived from an α-olefin having a carbonyl group can be determined by the elemental ratio of organic and inorganic substances determined by elemental analysis using EDX (Energy Dispersive X-ray spectroscopy), chemical structure analysis using Fourier transform infrared spectroscopy (FT-IR), and the heat of crystalline fusion determined by a differential scanning calorimeter (DSC).

[0044] Examples of α-olefins having a carbonyl group include (meth)acrylic acid alkyl esters, (meth)acrylic acid aryl esters, vinyl esters, unsaturated acids, vinyl ketones, and (meth)acrylic acid amides. Examples of (meth)acrylic acid alkyl esters include methyl (meth)acrylate and ethyl (meth)acrylate. Examples of (meth)acrylic acid aryl esters include phenyl (meth)acrylate. Examples of vinyl esters include vinyl acetate and vinyl propionate. Examples of unsaturated acids include (meth)acrylic acid, crotonic acid, maleic acid, and itaconic acid. Examples of vinyl ketones include methyl vinyl ketone and phenyl vinyl ketone. (Meth)acrylic acid refers to acrylic acid or methacrylic acid.

[0045] The proportion of structural units derived from α-olefins having a carbonyl group in the copolymer may be 5% by mass or more and 30% by mass or less. If this proportion is less than 5% by mass, the flexibility of a cable including an "electric wire having a conductor and a coating covering the conductor" tends to be impaired. If this proportion is more than 30% by mass, the mechanical properties of the coating, such as tensile strength, tend to be reduced in an "electric wire having a conductor and a coating covering the conductor." Furthermore, the mechanical properties of the coating, such as tensile strength, tend to be reduced in a "cable including a core wire and a coating layer covering the core wire."

[0046] The proportion of the structural units derived from the α-olefin having a carbonyl group in the copolymer can be determined from the intensity of the absorption peak due to the carbonyl group in the infrared absorption spectrum.

[0047] <Brominated Flame Retardant> The resin composition contains a brominated flame retardant. The content of the brominated flame retardant in the resin composition is 10% by mass or more and 30% by mass or less. This allows the resin composition to impart excellent flame retardancy and excellent mechanical properties to electric wires and cables. The content of the brominated flame retardant in the resin composition may be 12% by mass or more and 28% by mass or less, 15% by mass or more and 25% by mass or less, or 17% by mass or more and 20% by mass or less. Examples of brominated flame retardants include ethylene bis(pentabromophenyl) and ethylene bis(tetrabromophthalimide).

[0048] The content of the brominated flame retardant in the resin composition can be determined by the following method: It can be determined from the bromine content obtained by elemental analysis such as EDX or ICP optical emission spectroscopy (Inductively Coupled Plasma Emission Spectroscopy).

[0049] <Antimony trioxide> The resin composition contains antimony trioxide (Sb ２ O ３). In the resin composition, the content of antimony trioxide is 2% by mass or more and 15% by mass or less. This allows the resin composition to impart excellent flame retardancy and excellent mechanical properties to the electric wire and cable. In the resin composition, the content of antimony trioxide may be 3% by mass or more and 13% by mass or less, the content of antimony trioxide may be 4% by mass or more and 10% by mass or less, or the content of antimony trioxide may be 5% by mass or more and 8% by mass or less.

[0050] The content of antimony trioxide in the resin composition can be determined by the following method: It can be determined from the antimony content obtained by elemental analysis such as EDX or ICP emission spectrometry.

[0051] <First Compound, Second Compound, and Third Compound> The resin composition further contains at least two compounds selected from the group consisting of the first compound, the second compound, and the third compound. In the resin composition, the content of each of the at least two compounds selected from the group consisting of the first compound, the second compound, and the third compound is 0.01% by mass or more and 1.5% by mass or less. The highest absorption peak in the ultraviolet absorption spectrum of the first compound is in the range of 320 nm or more and 360 nm or less. The highest absorption peak in the ultraviolet absorption spectrum of the second compound is in the range of 275 nm or more and less than 320 nm. The highest absorption peak in the ultraviolet absorption spectrum of the third compound is in the range of 240 nm or more and less than 275 nm. As a result, the resin composition can impart excellent weather resistance to electric wires and cables. The content of each of the at least two compounds selected from the group consisting of the first compound, the second compound, and the third compound may be 0.015% by mass or more and 1.3% by mass or less, 0.01% by mass or more and 1.1% by mass or less, or 0.02% by mass or more and 1.0% by mass or less.

[0052] The total content of at least two compounds selected from the group consisting of the first compound, the second compound, and the third compound may be 0.2% by mass or more and 2.0% by mass or less. This can further improve the weather resistance of the electric wire or cable. The total content may be 0.3% by mass or more and 1.9% by mass or less, or 0.4% by mass or more and 1.8% by mass or less.

[0053] <First Compound> The highest absorption peak in the ultraviolet absorption spectrum of the first compound is in the region of 320 nm to 360 nm, and may be in the region of 325 nm to 355 nm, or in the region of 330 nm to 350 nm.

[0054] In the resin composition, the content of the first compound may be 0.1% by mass or more and 1.2% by mass or less. This can further improve the weather resistance of the electric wire and cable. In the resin composition, the content of the first compound may be 0.15% by mass or more and 1.1% by mass or less, or 0.2% by mass or more and 1.0% by mass or less.

[0055] The content of the first compound in a resin composition can be determined by the following method. After finely crushing the resin composition by freeze-pulverization, soluble components are extracted using a solvent such as chloroform. The resulting solution is then subjected to mass spectrometry to identify the components in the resin composition. Next, compounds whose highest absorption peaks in the ultraviolet absorption spectrum are present in the range of 320 nm to 360 nm are identified by ultraviolet absorption spectrometry. Next, the content of the first compound can be determined from a calibration curve for compounds present in the range of 320 nm to 360 nm and the amount of the compounds detected by mass spectrometry.

[0056] The first compound may be a compound represented by the following formula 1. This can further improve the weather resistance of the electric wire and cable.

[0057] In formula 1, R １ is a hydrogen atom or a halogen atom, and R ２is a hydrogen atom or a hydrocarbon group, and R ３ is a hydrogen atom or a hydrocarbon group.

[0058] R １ is a hydrogen atom or a chlorine atom, and R ２ is a hydrogen atom, a methyl group, or a group represented by the following formula 1d, and R ３ may be a hydrogen atom or a group represented by the following formula 1e: This can further improve the weather resistance of the electric wire and cable.

[0059]

[0060]

[0061] The first compound may be at least one compound selected from the group consisting of a compound represented by the following formula 1a, a compound represented by the following formula 1b, and a compound represented by the following formula 1c. This can further improve the weather resistance of the electric wire and cable. The first compound may be a compound represented by the following formula 1a. This can further improve the weather resistance of the electric wire and cable.

[0062]

[0063]

[0064]

[0065] <Second Compound> The second compound has the highest absorption peak in the ultraviolet absorption spectrum in the region of 275 nm or more and less than 320 nm. The absorption peak may be in the region of 280 nm or more and 315 nm or less, or in the region of 285 nm or more and 310 nm or less.

[0066] In the resin composition, the content of the second compound may be 0.01% by mass or more and 0.15% by mass or less. This can further improve the weather resistance of the electric wire and cable. In the resin composition, the content of the second compound may be 0.015% by mass or more and 0.13% by mass or less, or 0.02% by mass or more and 0.11% by mass or less.

[0067] In a resin composition, the content of the second compound can be determined by the following method, which is the same as the method for measuring the content of the first compound, except that the term "320 nm or more and 360 nm or less" in the method for measuring the content of the first compound is replaced with "275 nm or more and less than 320 nm" and the term "first compound" is replaced with "second compound."

[0068] The second compound may be a compound represented by the following formula 2. This can further improve the weather resistance of the electric wire and cable.

[0069]

[0070] <Third Compound> The third compound has the highest absorption peak in the ultraviolet absorption spectrum in the region of 240 nm or more and less than 275 nm. The absorption peak may be in the region of 245 nm or more and 270 nm or less, or in the region of 250 nm or more and 265 nm or less.

[0071] In the resin composition, the content of the third compound may be 0.1% by mass or more and 1.5% by mass or less. This can further improve the weather resistance of the electric wire and cable. In the resin composition, the content of the third compound may be 0.12% by mass or more and 1.3% by mass or less, or 0.15% by mass or more and 1.1% by mass or less.

[0072] In a resin composition, the content of the third compound can be determined by the following method, which is the same as the method for measuring the content of the first compound, except that the term "320 nm or more and 360 nm or less" in the method for measuring the content of the first compound is replaced with "240 nm or more and less than 275 nm" and the term "first compound" is replaced with "third compound."

[0073] The third compound may be a compound represented by the following formula 3. This can further improve the weather resistance of the electric wire and cable.

[0074] In the formula 3, R ４is a hydrocarbon group.

[0075] R ４ R may be a hydrocarbon group having 4 or more carbon atoms. This can further improve the weather resistance of the electric wire and cable. ４ The lower limit of the number of carbon atoms in R may be 6 or more, 8 or more, 10 or more, 12 or more, or 14 or more. ４ The upper limit of the number of carbon atoms in the formula (I) is not particularly limited, but may be, for example, 30 or less, 20 or less, or 18 or less.

[0076] R ４ is a linear -C １６ H ３３ group (in other words, -n-C １６ H ３３ This can further improve the weather resistance of the electric wire and cable.

[0077] <Hindered amine light stabilizer> The resin composition further contains a hindered amine light stabilizer, which is a compound having a structure represented by the following formula 4. The content of the hindered amine light stabilizer in the resin composition may be 0.1% by mass or more and 1.5% by mass or less, thereby further improving the weather resistance of the electric wire or cable.

[0078]

[0079] In the resin composition, the content of the hindered amine light stabilizer may be 0.12% by mass or more and 1.3% by mass or less, or 0.15% by mass or more and 1.1% by mass or less.

[0080] The content of the hindered amine light stabilizer in a resin composition can be determined by the following method. After finely crushing the resin composition by freeze-pulverization, the soluble components are extracted using a solvent such as chloroform. The solution is then subjected to mass spectrometry to identify the components in the resin composition. Next, the content of the hindered amine light stabilizer can be determined from a calibration curve of a compound corresponding to the hindered amine light stabilizer and the amount of the compound detected by mass spectrometry.

[0081] The hindered amine light stabilizer may be a compound comprising a structural unit represented by the following formula 4a: This can further improve the weather resistance of the electric wire and cable.

[0082]

[0083] The compound consisting of the structural unit represented by the above formula 4a can be rephrased as Poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]].

[0084] Other Components The resin composition may further contain other components, such as copolymers other than copolymers of structural units derived from ethylene and structural units derived from α-olefins having a carbonyl group (e.g., polyethylene), flame retardants other than brominated flame retardants, flame retardant auxiliaries, antioxidants, lubricants, colorants, reflectivity-imparting agents, opacifying agents, processing stabilizers, plasticizers, processing agents, and crosslinking agents.

[0085] <<Method for Producing Resin Composition>> The method for producing the resin composition according to this embodiment can be carried out in the same manner as a conventionally known method, except that the above components are blended so as to have the above content ratios.

[0086] [Embodiment 2: Electric Wire] An electric wire according to an embodiment of the present disclosure will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a schematic perspective view of an electric wire according to an embodiment of the present disclosure. Fig. 2 is a schematic cross-sectional view taken along II-II in Fig. 1.

[0087] One embodiment of the present disclosure (hereinafter also referred to as "the present embodiment") is an electric wire including a conductor and a coating covering the conductor, wherein the coating includes a first layer, and the first layer is made of the resin composition described in embodiment 1.

[0088] According to the present disclosure, it is possible to provide an electric wire having excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance, the reasons for which are presumably as described in (a) and (b) of embodiment 1.

[0089] <Electric Wire> The equivalent circle diameter of a cross section perpendicular to the longitudinal direction of the electric wire 1 may be 0.1 mm or more and 50 mm or less, 0.2 mm or more and 20 mm or less, or 0.5 mm or more and 10 mm or less. Note that the longitudinal direction here can be rephrased as the "first direction" described later.

[0090] The circle-equivalent diameter of the cross section perpendicular to the longitudinal direction of the electric wire 1 can be determined by the following method. First, the average cross-sectional area of ​​the electric wire 1 is determined by the same method as the average cross-sectional area of ​​the conductor 2, except that the object of measurement is the electric wire 1. Next, the circle-equivalent diameter is calculated based on the "average cross-sectional area of ​​the electric wire 1," thereby making it possible to determine the circle-equivalent diameter of the cross section perpendicular to the longitudinal direction of the electric wire 1.

[0091] It has been confirmed that, as long as the same electric wire 1 is measured by the above method, there is no variation in the measurement results even if the measurement location is changed arbitrarily.

[0092] <Conductor> The electric wire 1 includes a conductor 2. The material of the conductor 2 can be a metal material with high electrical conductivity and high mechanical strength. Examples of such metal materials include copper, copper alloys, aluminum, aluminum alloys, nickel, silver, mild steel, steel, and stainless steel. The conductor 2 can be a wire material formed from a single metal material. The conductor 2 can also have a multilayer structure in which the wire material is coated with another metal by a technique such as plating. Examples of the conductor 2 having a multilayer structure include tin-plated copper wire, nickel-plated copper wire, silver-plated copper wire, copper-plated aluminum wire, and copper-plated steel wire.

[0093] The shape of the conductor 2 is not particularly limited, and any conventionally known shape can be used. Examples of the shape of the conductor 2 include a round wire having a circular cross section, a rectangular wire having a square cross section, a rectangular wire having a rectangular cross section, and a twisted wire formed by twisting together a plurality of wires.

[0094] The equivalent circle diameter of a cross section perpendicular to the longitudinal direction of the conductor 2 may be 0.05 mm to 30 mm, 0.1 mm to 15 mm, or 0.3 mm to 8 mm. Here, the longitudinal direction can be rephrased as the "first direction" described later.

[0095] The equivalent circle diameter of a cross section perpendicular to the longitudinal direction of the conductor 2 can be determined in the same manner as the equivalent circle diameter of a cross section perpendicular to the longitudinal direction of the wire 1, except that the object of measurement is the conductor 2.

[0096] It has been confirmed that, as long as measurements are made on the same conductor 2 using the above method, there is no variation in the measurement results even if the measurement location is changed arbitrarily.

[0097] The average cross-sectional area of ​​the conductor 2 is not particularly limited and can be appropriately selected depending on the application. ２ Over 550mm ２ It may be 0.006 mm or less, ２ Over 140mm ２ It may be 0.05 mm or less. ２ Over 40mm ２In the present disclosure, the average cross-sectional area of ​​the conductor 2 is measured as follows: One conductor 2 is stretched in a straight line, cut along a plane normal to a first direction connecting one end of the conductor 2 to the other, the cross section is exposed, and the cross-sectional area is measured. For one conductor 2, the conductor 2 is cut along a plane normal to the first direction at any five locations, the cross-sectional areas are measured, and an average value is calculated. The average value corresponds to the average cross-sectional area of ​​the conductor 2.

[0098] <Coating> The electric wire 1 includes a coating 5 that coats the conductor 2. The coating 5 includes a first layer 3. The coating 5 may consist of only the first layer 3, or may further include other layers described below in addition to the first layer 3.

[0099] The thickness of the coating 5 may be 0.025 mm or more and 10 mm or less. If the thickness of the coating 5 is less than 0.025 mm, the coating 5 tends to be easily damaged. If the thickness of the coating 5 exceeds 10 mm, the electric wire 1 tends to be hard and difficult to bend, and the cost tends to be high. The thickness of the coating 5 may be 0.050 mm or more and 2.5 mm or less, or 0.150 mm or more and 1 mm or less.

[0100] In the present disclosure, the thickness of the coating 5 can be determined by the following method. The electric wire 1 is stretched in a straight line, and cut along a plane normal to a first direction connecting one end of the electric wire 1 to the other end of the electric wire 1 to expose a cross section. The thickness of the coating 5 is measured at three arbitrary locations on the cross section, and the average value is calculated. The electric wire 1 is cut along a plane normal to the first direction at a total of five arbitrary locations to determine the average values, and the thickness of the coating 5 is determined by calculating the average value.

[0101] It has been confirmed that, as long as the same electric wire 1 is measured by the above method, there is no variation in the measurement results even if the measurement location is changed arbitrarily.

[0102] <First Layer> The first layer 3 is made of the resin composition described in embodiment 1. This allows the electric wire to have excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance.

[0103] The composition of the first layer 3 can be identified by a combination of an analysis of the chemical bonding state based on measurements of a nuclear magnetic resonance (NMR) spectrum and an infrared absorption spectrum by FT-IR, and measurements of the crystalline melting temperature and the heat of crystalline melting by a differential scanning calorimeter.

[0104] The thickness of the first layer 3 may be 0.025 mm or more and 10 mm or less. This can impart better weather resistance to the electric wire 1. Furthermore, the electric wire 1 can be made easier to bend. The lower limit of the thickness of the first layer 3 may be 0.025 mm or more, 0.050 mm or more, 0.100 mm or more, or 0.200 mm or more. The upper limit of the thickness of the first layer 3 may be 10 mm or less, 2.5 mm or less, 1 mm or less, or 0.500 mm or less. The thickness of the first layer 3 may be 0.050 mm or more and 2.5 mm or less, or 0.100 mm or more and 1 mm or less.

[0105] The thickness of the first layer 3 can be determined in the same manner as the thickness of the coating 5, except that the measurement target is the first layer 3.

[0106] It has been confirmed that, as long as the same electric wire 1 is measured by the above method, there is no variation in the measurement results even if the measurement location is changed arbitrarily.

[0107] <Other Layers> The coating 5 may further include other layers. Examples of such other layers include a surface layer and an intermediate layer. The surface layer is a layer located on the surface of the coating 5 (not shown). The intermediate layer is a layer located between the conductor 2 and the first layer 3 or between the first layer 3 and the surface layer (not shown).

[0108] <<Method for Manufacturing Electric Wire>> The method for manufacturing the electric wire 1 of the present embodiment can be carried out in the same manner as a conventionally known method, except that the resin composition described in embodiment 1 is used as the material for the first layer 3.

[0109] [Embodiment 3: Cable] A cable according to an embodiment of the present disclosure will be described with reference to Fig. 6. Fig. 6 is a schematic cross-sectional view showing the configuration of a cable according to an embodiment of the present disclosure.

[0110] The cable of this embodiment is a cable comprising a core wire and a coating layer coating the core wire, wherein the core wire includes a plurality of electric wires, and the coating layer includes a first A layer, which is located on the surface of the coating layer, and which is made of the resin composition described in embodiment 1.

[0111] According to the present disclosure, it is possible to provide a cable including an electric wire having excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance, the reasons for which are presumably as described in (a) and (b) of embodiment 1.

[0112] <Core Wire> The core wire includes multiple electric wires. In other words, the core wire can be understood as an assembly of multiple electric wires. The core wire may be, for example, a stranded wire formed by twisting multiple electric wires together. The number of electric wires constituting the core wire is not particularly limited, and may be, for example, two, four, or six. The diameters (outer diameters) of the multiple electric wires constituting the core wire may be the same or different. For example, the core wire may be formed by twisting together two or more electric wires each having the same diameter. Here, "same" does not necessarily mean completely identical, but also includes approximately identical. Furthermore, the core wire may be formed by twisting together multiple insulated wires having different diameters. The electric wire may include a conductor and a coating covering the conductor. The electric wire may be a conventionally known electric wire, the electric wire described in embodiment 2, or a combination thereof.

[0113] <<Coating Layer>> The coating layer includes a first A layer, which is located on the surface of the coating layer. The coating layer may include other layers as long as it includes the first A layer. Examples of other layers include a base layer (not shown) located between the core wire and the first A layer. The coating layer may consist of the first A layer.

[0114] <Layer 1A> The layer 1A is made of the resin composition described in embodiment 1. This makes it possible to impart excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance to the cable.

[0115] The composition of Layer 1A can be identified by a combination of an analysis of the chemical bonding state based on measurements of a nuclear magnetic resonance (NMR) spectrum and an infrared absorption spectrum by FT-IR, and measurements of the crystalline melting temperature and the heat of crystalline melting by a differential scanning calorimeter.

[0116] The thickness of the 1A layer may be 0.025 mm or more and 10 mm or less. This can impart better weather resistance to the cable. It can also make the cable easier to bend. The lower limit of the cable thickness may be 0.025 mm or more, 0.050 mm or more, 0.100 mm or more, or 0.200 mm or more. The upper limit of the cable thickness may be 10 mm or less, 2.5 mm or less, 1 mm or less, or 0.500 mm or less. The cable thickness may be 0.050 mm or more and 2.5 mm or less, or 0.100 mm or more and 1 mm or less.

[0117] The thickness of the 1A layer can be determined by the following method. The cable is stretched in a straight line and cut along a plane normal to the second direction connecting one end of the cable to the other, exposing a cross section. The thickness of the 1A layer is measured at three arbitrary locations on the cross section, and the average value is calculated. The cable is cut at a total of five arbitrary locations along a plane normal to the second direction to determine the average values, and the thickness of the 1A layer is determined by calculating the average value.

[0118] It has been confirmed that, as long as measurements are made using the above method on the same cable, there is no variation in the measurement results even if the measurement location is changed arbitrarily.

[0119] <<Cable Manufacturing Method>> The cable manufacturing method according to this embodiment can be carried out in the same manner as a conventionally known method, except that the resin composition described in embodiment 1 is used as the material for the 1A layer.

[0120] The present embodiment will be described in more detail with reference to examples, although the present embodiment is not limited to these examples.

[0121] Electric wires according to Samples 1 to 18 and 101 to 110 were prepared as follows.

[0122] <Preparation of Resin Compositions> Mixtures were prepared by blending the components listed in Tables 3 to 6 to obtain the compositions listed in Tables 3 to 6. Next, the mixtures were kneaded for the times listed in Tables 1 and 2 using rolls heated to the temperatures listed in Tables 1 and 2, thereby preparing the resin compositions for each sample. The raw materials were commercially available. In Tables 3 and 4, EEA refers to ethylene ethyl acrylate copolymer (in other words, the "copolymer of ethylene-derived structural units and carbonyl group-containing α-olefin-derived structural units" in this disclosure). ENEOS NUC Corporation's "NUC-6510" (trademark) was used as the EEA. Albemarle Japan Co., Ltd.'s "Saytex 8010" (trademark) was used as the brominated flame retardant. BASF Japan Ltd.'s "Tinuvin P" (trademark) was used as the first compound. Chemipro Chemicals' "KEMISORB 102" (trademark) was used as the second compound. As the third compound, "KEMISORB 114" (trademark) manufactured by Chemipro Chemical Co., Ltd. was used. As the hindered amine light stabilizer, "Chimassorb 944FDL" (trademark) manufactured by BASF Japan Ltd. was used. In Tables 5 and 6, VLDPE refers to very low density polyethylene (in other words, "a copolymer other than a copolymer of structural units derived from ethylene and structural units derived from an α-olefin having a carbonyl group" in the present disclosure). As the VLDPE, "Engage 7467" (trademark) manufactured by Dow was used. As the first antioxidant, zinc oxide (ZnO) was used. As the second antioxidant, "Sumilizer MB" (trademark) manufactured by Sumitomo Chemical Co., Ltd. was used. As the third antioxidant, "Irganox 1010" (trademark) manufactured by BASF Japan Ltd. was used. As the fourth antioxidant, Irganox PS802 manufactured by BASF Japan Ltd. was used. Stearic acid was used as the treatment agent, trimethylolpropane trimethacrylate (TMPTMA) was used as the cross-linking agent, and Saytex BT93 (trademark) manufactured by Albemarle Japan Co., Ltd. was used as the flame retardant other than the brominated flame retardant.

[0123] <Preparation of Conductor> A commercially available conductor was prepared. The conductor was a copper wire having a cross section perpendicular to the longitudinal direction with a circular equivalent diameter of 6.0 mm.

[0124] <Preparation of Electric Wire> First, the resin composition of each sample was pressed into an extruder whose head was set to the temperature shown in Tables 1 and 2 and whose cylinder was set to the temperature shown in Tables 1 and 2. Next, the resin composition of each sample was extrusion coated onto the outer periphery of the conductor so that the thickness of the first layer was as shown in Tables 7 and 8. Next, the extrusion-coated resin composition of each sample was irradiated with an electron beam at a dose shown in Tables 1 and 2 to form a first layer (coating) on ​​the outer periphery of the conductor.

[0125] In this manner, electric wires according to Samples 1 to 18 and 101 to 110 were produced.

[0126]

[0127]

[0128]

[0129]

[0130]

[0131]

[0132]

[0133]

[0134] <Evaluation of Electric Wire Characteristics> <Heat Resistance Test> First, eight electric wires (length: 350 mm) for each sample were prepared. Next, the coating was stripped from both ends of the electric wires in the area between the end and a position 25 mm away from the end in the longitudinal direction of the electric wire. Next, each of the eight electric wires (length: 350 mm) for each sample was left in a thermostatic chamber at temperatures of 85±2°C, 100±2°C, 125±3°C, 150±3°C, 175±3°C, 200±3°C, 225±4°C, and 250±4°C for 3,000 hours. Next, the electric wires were removed from the thermostatic chamber and left at room temperature for 16 hours. Next, a weight 13 having a mass of 5 kg was placed on a mandrel 11 having a diameter 1.5 times the equivalent circle diameter of a cross section perpendicular to the longitudinal direction of the electric wire 12, and the winding speed was 1 s. －１ The wire was wound twice at two locations at room temperature (Fig. 3). Next, after visually confirming that the conductor of each sample wire was not exposed, the wire was immersed in salt water (3 mass%) for 10 minutes. Next, a voltage of 1 kV was applied to the wire for 1 minute. Next, the wire was visually observed to determine whether or not the coating had been damaged. Next, the heat resistance of the wire was evaluated based on the following evaluation criteria. The obtained results are shown in the "Heat Resistance Test" column in Tables 7 and 8. The closer the evaluation result is to H, the better the heat resistance of the wire. (Evaluation criteria) A: No breakdown of the coating when the temperature of the thermostatic bath is 85±2°C or less B: No breakdown of the coating when the temperature of the thermostatic bath is 100±2°C or less C: No breakdown of the coating when the temperature of the thermostatic bath is 125±3°C or less D: No breakdown of the coating when the temperature of the thermostatic bath is 150±3°C or less E: No breakdown of the coating when the temperature of the thermostatic bath is 175±3°C or less F: No breakdown of the coating when the temperature of the thermostatic bath is 200±3°C or less G: No breakdown of the coating when the temperature of the thermostatic bath is 225±4°C or less H: No breakdown of the coating when the temperature of the thermostatic bath is 250±4°C or less

[0135] <Flame Retardancy Test> First, a 300 mm long test piece 21 was taken from each sample electric wire. Next, as shown in Figure 4, each test piece 21 was supported horizontally, and the tip of a reducing flame 23 of a burner 22 was applied from below the center of the sample until the first layer burned, and the time from when the flame was gently removed until the burning flame disappeared was measured. The results obtained are shown in the "Burning Time [Seconds]" column in Tables 7 and 8. A burning time [seconds] of 30 seconds or less means that the electric wire has excellent flame retardancy.

[0136] <Tensile Test> First, three test pieces were taken from each sample electric wire (length: 3 m) at 1 m intervals from the portion corresponding to the first layer of the electric wire. Next, each of the three test pieces was made into a dumbbell shape, with the thickness of the first layer remaining the same, to obtain three dumbbell pieces 30 (see FIG. 5 ) of type 3 defined in JIS K 6251:2004, 6.1. Next, the three dumbbell pieces 30 were left to stand at room temperature for one hour. Each dumbbell piece 30 was pulled from the gripping portions 31 at both ends of the dumbbell piece 30 at a speed of 200 mm / min, and the distance l between the marked lines at the time of breaking of each dumbbell piece 30 was measured. １ Next, the distance l between the marks when cutting each dumbbell piece 30 was measured. １ [mm], distance l between the gauge lines before the test ０ [mm], and the formula "ε = {(l １ -l ０ ) / l ０} × 100". Next, the elongation [%] of the electric wire for each sample was determined by calculating the average value of the elongation [ε] of the three dumbbell pieces 30. The obtained results are shown in the "Elongation [%]" column of the "Tensile test" column in Tables 7 and 8. An elongation [%] of 300% or more means that the electric wire has excellent elongation.

[0137] <Weather Resistance Test> First, a portion of the electric wire of each sample corresponding to the first layer was punched into a dumbbell shape using a No. 6 dumbbell blade to obtain a test specimen of each sample. Next, the test specimen of each sample was exposed to a light source based on ISO 4892-2 under the following conditions. Next, for the test specimen of each sample, the gauge length L of the test specimen after exposure and before the tensile test was measured.０ Next, for the test pieces of each sample, the gauge length L after exposure and after the tensile test was measured. ２ Next, for the test pieces of each sample, the elongation ε of the test pieces after exposure and after the tensile test was measured. ２ [%] is calculated using the formula "ε ２ = {(L ２ -L ０ ) / L ０ The results are shown in the "Elongation [%]" column of the "Weather resistance test" column in Tables 7 and 8. The elongation ε of the test piece ２ When [%] is 50% or more, it means that the weather resistance of the electric wire is excellent. (Conditions) Lamp Power: 565 W / m ２ ・Broadband (300-800nm): 60±2W / m ２ Filter: Daylight Black panel temperature: 63±3°C Chamber temperature: 38±3°C Relative humidity: 50±10% Lamp temperature: 63±3°C Water spray time: 18 minutes Dry interval: 102 minutes Lamp cycle time (Lamp on): 120 minutes

[0138] The electric wires of Samples 1 to 18 correspond to Examples. The electric wires of Samples 101 to 110 correspond to Comparative Examples. The results in Tables 7 and 8 show that the electric wires of Samples 1 to 18 exhibit superior effects, such as excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance, compared to the electric wires of Samples 101 to 110.

[0139] From the above, it was found that the electric wires according to Samples 1 to 18 had excellent heat resistance, excellent flame retardancy, excellent elongation, and excellent weather resistance. Note that in the above examples, only the resin composition and the electric wire are shown. However, in light of the common technical knowledge of a person skilled in the art, it is expected that the same effects will be achieved in cables as long as the resin composition of the present disclosure is used.

[0140] Although the embodiments and examples of the present disclosure have been described above, it is originally intended that the configurations of the above-described embodiments and examples may be appropriately combined or modified in various ways.

[0141] The embodiments and examples disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is defined by the claims, not by the embodiments and examples described above, and is intended to include meanings equivalent to the claims and all modifications within the scope of the claims.

[0142] REFERENCE SIGNS LIST 1 Electric wire, 2 Conductor, 3 First layer, 5 Coating, 11 Mandrel, 12 Electric wire, 13 Weight, 21 Test piece, 22 Burner, 23 Reduction flame, 30 Dumbbell piece, 31 Knob, 41 Conductor, 42 Coating, 43 Electric wire, 44 Core wire, 47 First A layer, 48 Coating layer, 50 Cable

Claims

1. A resin composition comprising a copolymer of a structural unit derived from ethylene and a structural unit derived from an α-olefin having a carbonyl group, a brominated flame retardant, and antimony trioxide, wherein in the resin composition, the content of the copolymer is 20% by mass or more and 60% by mass or less; in the resin composition, the content of the brominated flame retardant is 10% by mass or more and 30% by mass or less; in the resin composition, the content of the antimony trioxide is 2% by mass or more and 15% by mass or less; the resin composition further comprises at least two compounds selected from the group consisting of a first compound, a second compound, and a third compound; in the resin composition, the content of each of the at least two compounds selected from the group consisting of the first compound, the second compound, and the third compound is 0.01% by mass or more and 1.5% by mass or less; the highest absorption peak in the ultraviolet absorption spectrum of the first compound is in the region of 320 nm or more and 360 nm or less; the highest absorption peak in the ultraviolet absorption spectrum of the second compound is in the region of 275 nm or more and less than 320 nm; the highest absorption peak in the ultraviolet absorption spectrum of the third compound is in the region of 240 nm or more and less than 275 nm.

2. The first compound is a compound represented by the following formula 1, the second compound is a compound represented by the following formula 2, and the third compound is a compound represented by the following formula 3. The resin composition according to claim 1. In the formula 1, R １ is a hydrogen atom or a halogen atom, and R ２ is a hydrogen atom or a hydrocarbon group, and R ３ is a hydrogen atom or a hydrocarbon group. In the formula 3, R ４ is a hydrocarbon group.

3. The R １ is a hydrogen atom or a chlorine atom, and the R ２ is a hydrogen atom, a methyl group, or a group represented by the following formula 1d, and the R ３ is a hydrogen atom or a group represented by the following formula 1e. The resin composition according to claim 2.

4. The resin composition according to any one of claims 1 to 3, wherein the first compound is at least one compound selected from the group consisting of a compound represented by the following formula 1a, a compound represented by the following formula 1b, and a compound represented by the following formula 1c.

5. The resin composition according to claim 4, wherein the first compound is a compound represented by the formula 1a.

6. The R ４ is a hydrocarbon group having 4 or more carbon atoms, and the resin composition according to any one of claims 1 to 5.

7. The R ４ is a linear - C １６ H ３３ group. The resin composition according to any one of claims 1 to 6 8. The resin composition further contains a hindered amine light stabilizer, the hindered amine light stabilizer is a compound having a structure represented by the following formula 4, and in the resin composition, the content of the hindered amine light stabilizer is 0.1% by mass or more and 1.5% by mass or less. The resin composition according to any one of claims 1 to 7.

9. The resin composition according to claim 8, wherein the hindered amine light stabilizer is a compound comprising a structural unit represented by the following formula 4a.

10. An electric wire comprising a conductor and a coating covering the conductor, wherein the coating includes a first layer, and the first layer is made of the resin composition according to any one of claims 1 to 9.

11. A cable comprising a core wire and a coating layer covering the core wire, wherein the core wire includes a plurality of electric wires, the coating layer includes a first A layer, the first A layer is located on the surface of the coating layer, and the first A layer is made of the resin composition according to any one of claims 1 to 9.

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