Resin composition and cross-linked body of resin composition

Abstract

To provide a resin composition that enables formation of a molded article exhibiting superior electrical insulation and heat resistance, and further exhibiting an adequately high modulus.SOLUTION: A resin composition (X) includes: a copolymer of ethylene, α-olefin, and non-conjugated polyene (A) containing constitutional units derived from ethylene (a1), constitutional units derived from an α-olefin (a2) having 3-20 carbon atoms, and constitutional units derived from a non-conjugated polyene (a3); a polyolefin (B); and a reinforcing material (C), the polyolefin (B) including constitutional units derived from at least one olefin selected from branched α-olefins having 5-20 carbon atoms, and the polyolefin (B) having a melting point of 225°C or more in accordance with the measurement method of JIS K 7121:2012.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin composition and a crosslinked product of the resin composition. [Background technology]

[0002] Ethylene-based copolymers such as ethylene-α-olefin-non-conjugated polyene copolymers have no unsaturated bonds in the main chain, and therefore have superior weather resistance, heat resistance, and ozone resistance compared to diene-based rubbers, and are widely used in rubber products such as automotive parts, industrial rubber products, electrical insulation materials, civil engineering and building materials, and rubber-coated fabrics. Ethylene-α-olefin-non-conjugated polyene copolymers are also sometimes used in hose products and cable coating materials.

[0003] When resin compositions containing ethylene-α-olefin-non-conjugated polyene copolymers are used in hose products, cable coatings, and the like, they are required to have excellent heat resistance, electrical insulation, and mechanical properties. Patent Document 1 proposes a composition containing 100 parts by weight of an ethylene-α-olefin-non-conjugated polyene copolymer and 5 to 400 parts by weight of a crystalline olefin resin having a Vicat softening point of 130°C or higher as a material for electrical insulating rubber with excellent electrical insulation. Patent Document 2 also proposes a composition that can produce molded articles with excellent heat resistance and mechanical strength, which is composed of 100 parts by weight of a composition obtained by dynamically vulcanizing a composition comprising 100 parts by weight of an ethylene-α-olefin-non-conjugated polyene copolymer, 5 to 200 parts by weight of a crystalline polypropylene resin, and 0 to 300 parts by weight of a mineral oil-based softener, and 10 to 300 parts by weight of a 4-methyl-1-pentene polymer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-286882 [Patent Document 2] Japanese Patent Application Publication No. 3-188144 Summary of the Invention [Problem to be solved by the invention]

[0005] Although the composition described in Patent Document 1 has excellent electrical insulation properties, depending on the application, its heat resistance and strength may be insufficient. Furthermore, the present inventors have conducted extensive research and found that, although compositions used in the manufacture of hose products, cable coating materials, and other applications requiring relatively high strength are required to produce molded articles with a relatively high modulus and excellent strength, if the modulus is too high, it becomes difficult to deform the molded articles to fit the installation site. For example, the molded articles obtained from the composition described in Patent Document 2 have such high modulus that they tend to be difficult to deform to fit the installation site. That is, it has been found that compositions used in the manufacture of hose products and the like are required to produce molded articles with a moderately high modulus (e.g., a 100% modulus of 2.0 to 7.0 MPa) and also with excellent electrical insulation properties and heat resistance.

[0006] An object of the present invention is to provide a resin composition that is excellent in electrical insulation and heat resistance and that can be used to form a molded article having a moderately high modulus. [Means for solving the problem]

[0007] As a result of further research, the present inventors have found that the above-mentioned problems can be solved by the following configuration example. In this specification, the numerical range "A to B" indicates A or more and B or less.

[0008] [1] An ethylene-α-olefin-non-conjugated polyene copolymer (A) having a structural unit derived from ethylene (a1), a structural unit derived from an α-olefin (a2) having 3 to 20 carbon atoms, and a structural unit derived from a non-conjugated polyene (a3); a polyolefin (B); a reinforcing material (C); Including, The polyolefin (B) contains a structural unit derived from at least one olefin selected from branched α-olefins having 5 to 20 carbon atoms, The resin composition (X) has a melting point of the polyolefin (B) (measured according to the method of JIS K 7121:2012) of 225°C or higher.

[0009] [2] The resin composition (X) according to [1], wherein the polyolefin (B) contains 50 to 100 mol % of structural units derived from at least one olefin selected from branched α-olefins having 5 to 20 carbon atoms.

[0010] [3] The resin composition (X) according to [1] or [2], wherein the copolymer (A) satisfies all of the following requirements (Ai) to (A-iii): (Ai) the Mooney viscosity measured at 125°C (in accordance with the measurement method of JIS K6300-1:2013) is 5 to 200; (A-ii) the molar ratio of the structural units derived from ethylene (a1) to the structural units derived from the α-olefin (a2) [(a1) / (a2)] is 40 / 60 to 90 / 10; (A-iii) The content of the structural units derived from the non-conjugated polyene (a3) ​​is 1.0 to 20.0% by mass relative to 100% by mass of all structural units constituting the copolymer (A).

[0011] [4] The resin composition (X) according to any one of [1] to [3], wherein the non-conjugated polyene (a3) ​​is 5-ethylidene-2-norbornene or 5-vinyl-2-norbornene.

[0012] [5] The resin composition (X) according to any one of [1] to [4], wherein the polyolefin (B) contains a 4-methyl-1-pentene polymer.

[0013] [6] The resin composition (X) according to [5], wherein the 4-methyl-1-pentene polymer contains 90 mol % or more of structural units derived from 4-methyl-1-pentene.

[0014] [7] The resin composition (X) according to any one of [1] to [6], wherein the polyolefin (B) has a melt flow rate (measured in accordance with the method of ASTM D1238, at 260°C and under a load of 5 kg) of 1 to 500 g / 10 min.

[0015] [8] The resin composition (X) according to any one of [1] to [7], wherein the content of the polyolefin (B) is 4 to 80 parts by mass per 100 parts by mass of the copolymer (A).

[0016] [9] The resin composition (X) according to any one of [1] to [8], wherein the reinforcing material (C) contains carbon black.

[0017]

[10] The resin composition (X) according to any one of [1] to [9], wherein the content of the reinforcing material (C) is 1 to 300 parts by mass per 100 parts by mass of the copolymer (A).

[0018]

[11] The resin composition (X) according to any one of [1] to

[10] , further comprising a crosslinking agent (D).

[0019]

[12] A crosslinked product of the resin composition (X) according to any one of [1] to

[11] .

[0020]

[13] Volume resistivity (measured according to JIS K 6911 (1995)) is 10 7 The crosslinked body according to

[12] , having a resistance of Ω·cm or more.

[0021]

[14] A hose product comprising the crosslinked body according to

[12] .

[0022]

[15] A cable coating material comprising the crosslinked body according to

[12] . [Effects of the Invention]

[0023] The present invention provides a resin composition that is excellent in electrical insulation and heat resistance and can be used to form a molded article having a moderately high modulus. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited to the configurations of the following embodiments.

[0025] ≪Resin composition (X)≫ The resin composition (X) of the present invention comprises an ethylene-α-olefin-non-conjugated polyene copolymer (A), a polyolefin (B), and a reinforcing material (C), wherein the polyolefin (B) comprises a structural unit derived from at least one olefin selected from branched α-olefins having 5 to 20 carbon atoms and has a melting point of 225°C or higher.

[0026] <Ethylene-α-olefin-non-conjugated polyene copolymer (A)> The ethylene-α-olefin-non-conjugated polyene copolymer (A) (hereinafter also referred to as copolymer (A)) used in the present invention is a rubber component and may be a random copolymer or a block copolymer. The copolymer (A) is preferred because of its excellent weather resistance and vulcanizability. The copolymer (A) contained in the resin composition (X) may be one type or two or more types.

[0027] The copolymer (A) has structural units derived from ethylene (a1), structural units derived from an α-olefin (a2) having 3 to 20 carbon atoms, and structural units derived from a non-conjugated polyene (a3). Specific examples of the α-olefin (a2) include propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-nonadecene, 1-eicosene, 9-methyl-1-decene, 11-methyl-1-dodecene, and 12-ethyl-1-tetradecene. Among these, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, and 1-octene are preferred, with propylene being particularly preferred. These α-olefins (a2) may be used alone or in combination of two or more.

[0028] Specific examples of the non-conjugated polyene (a3) ​​include linear non-conjugated dienes such as 1,4-hexadiene, 3-methyl-1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene, 4,5-dimethyl-1,4-hexadiene, 7-methyl-1,6-octadiene, 8-methyl-4-ethylidene-1,7-nonadiene, and 4-ethylidene-1,7-undecadiene; methyltetrahydroindene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, 5-isopropylidene-2-norbornene, and the like. Examples of suitable non-conjugated polyenes include cyclic non-conjugated dienes such as cyclopentadiene, 5-vinylidene-2-norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene, 5-vinyl-2-norbornene, 5-isopropenyl-2-norbornene, 5-isobutenyl-2-norbornene, cyclopentadiene, and norbornadiene; and trienes such as 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, 2-propenyl-2,2-norbornadiene, and 4-ethylidene-8-methyl-1,7-nonadiene. Among these, 5-ethylidene-2-norbornene and 5-vinyl-2-norbornene are preferred, with 5-ethylidene-2-norbornene being more preferred. These non-conjugated polyenes (a3) ​​may be used alone or in combination of two or more.

[0029] Specific examples of copolymer (A) include ethylene-propylene-5-ethylidene-2-norbornene random copolymer, ethylene-propylene-5-vinyl-2-norbornene random copolymer, and ethylene-propylene-5-ethylidene-2-norbornene-5-vinyl-2-norbornene random copolymer.

[0030] The copolymer (A) preferably satisfies at least one of the following requirements (Ai) to (A-iii), more preferably satisfies two or more of them, and even more preferably satisfies all of them.

[0031] [Requirements (Ai)] The Mooney viscosity of the copolymer (A), measured at 125°C in accordance with the measurement method of JIS K6300-1:2013, is preferably 5 to 200, more preferably 20 to 150, even more preferably 30 to 100, particularly preferably 50 to 80, and even more preferably 60 to 70. When the Mooney viscosity of the copolymer (A), measured at 125°C, is within the above range, the resin composition (X) has good processability in kneading and extrusion molding. If the copolymer (A) itself does not have a Mooney viscosity within the above range, it may be extended, if necessary, using a conventionally known method, for example, an oil extender such as a softener. Examples of such oil extenders include petroleum-based softeners such as paraffin-based process oil. The amount of oil extender used in this oil extension is preferably such that the Mooney viscosity of the oil-extended product falls within the above range.

[0032] [Requirement (A-ii)] The molar ratio of the structural units derived from ethylene (a1) to the structural units derived from α-olefin (a2) [(a1) / (a2)] is preferably 40 / 60 to 90 / 10, more preferably 50 / 50 to 85 / 15. When the molar ratio [(a1) / (a2)] is within the above range, a material with good mechanical properties can be obtained. Here, the molar ratio [(a1) / (a2)] is 13 It can be determined using the content of each structural unit measured by C-NMR.

[0033] [Requirement (A-iii)] The content of the structural units derived from the non-conjugated polyene (a3) ​​is preferably 1.0 to 20.0 mass%, more preferably 2.0 to 15.0 mass%, even more preferably 3.0 to 10.0 mass%, and particularly preferably 3.5 to 7.0 mass%, relative to 100 mass% of all structural units constituting the copolymer (A).

[0034] Molded articles having high rubber elasticity can be obtained from the resin composition (X) using the copolymer (A) in which the content of the structural units derived from the non-conjugated polyene (a3) ​​falls within the above range. The copolymer (A) can be produced by the method described in, for example, WO2015 / 122415.

[0035] The copolymer (A) may contain structural units derived from at least one biomass-derived monomer. The biomass-derived monomer used as the raw material for the copolymer (A) may be biomass-derived ethylene, biomass-derived α-olefin, or biomass-derived non-conjugated polyene. Examples of biomass-derived α-olefins include biomass-derived propylene. Examples of biomass-derived non-conjugated polyenes include biomass-derived 5-ethylidene-2-norbornene and biomass-derived 5-vinyl-2-norbornene. The monomers used as the raw materials for the copolymer (A) may contain only biomass-derived monomers, or may contain both biomass-derived monomers and fossil fuel-derived monomers. Biomass-derived monomers such as biomass-derived ethylene, biomass-derived α-olefins, and biomass-derived non-conjugated polyenes can be obtained by known methods. It is preferable that the copolymer (A) contain structural units derived from biomass-derived monomers from the viewpoint of reducing environmental impact.

[0036] The copolymer (A) may contain at least one structural unit derived from a chemically recycled monomer. The chemically recycled monomer used as the raw material for the copolymer (A) may be ethylene derived from chemical recycling, an α-olefin derived from chemical recycling, or a non-conjugated polyene derived from chemical recycling. Furthermore, the monomer used as the raw material for the copolymer (A) may contain only a monomer derived from chemical recycling, or may contain both a monomer derived from chemical recycling and a monomer derived from fossil fuel. Chemically recycled monomers such as ethylene derived from chemical recycling, an α-olefin derived from chemical recycling, and a non-conjugated polyene derived from chemical recycling can be obtained by known methods. It is preferable that the copolymer (A) contains a structural unit derived from a chemically recycled monomer from the viewpoint of reducing the environmental load (mainly reducing waste).

[0037] <Polyolefin (B)> The polyolefin (B) is a polymer obtained by (co)polymerizing at least one olefin selected from α-olefins having 3 to 20 carbon atoms, and contains structural units derived from at least one olefin selected from branched α-olefins having 5 to 20 carbon atoms. Here, (co)polymerization is a concept that encompasses both the case where the above-described α-olefins are polymerized alone and the case where the above-described α-olefins are copolymerized with other olefins. Note that the polyolefin (B) is different from the copolymer (A). The content of the structural units derived from at least one olefin selected from branched α-olefins having 5 to 20 carbon atoms in the polyolefin (B) is preferably 50 to 100 mol % relative to 100 mol % of all structural units constituting the polyolefin (B). The polyolefin (B) contained in the resin composition (X) may be one type or two or more types.

[0038] Specific examples of the at least one olefin selected from α-olefins having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 2-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 2-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicosene.

[0039] Among these, from the viewpoint of the heat resistance and low dielectric properties of the resulting polyolefin, the olefin used is preferably a branched α-olefin having 5 to 20 carbon atoms, more preferably 3-methyl-1-butene or 4-methyl-1-pentene, and even more preferably 4-methyl-1-pentene.

[0040] When the polyolefin (B) is a homopolymer, the polyolefin (B) is obtained by polymerizing one type of olefin selected from α-olefins having 5 to 20 carbon atoms (100 mol % of the structural units are derived from α-olefins having 5 to 20 carbon atoms).

[0041] When polyolefin (B) is a copolymer, it is obtained by copolymerizing two or more olefins selected from α-olefins having 3 to 20 carbon atoms. However, it contains structural units derived from at least one olefin selected from branched α-olefins having 5 to 20 carbon atoms. Among these, from the viewpoint of the heat resistance and low dielectric properties of the resulting polyolefin, it is preferable that structural units derived from branched α-olefins having 5 to 20 carbon atoms are used as the main structural units, and that other olefins to be copolymerized contain structural units derived from ethylene and α-olefins having 3 to 20 carbon atoms (excluding the α-olefins selected from branched α-olefins having 5 to 20 carbon atoms from which the main structural units are derived). In other words, the content of structural units derived from at least one olefin selected from branched α-olefins having 5 to 20 carbon atoms is preferably 50 to 100 mol % relative to 100 mol % of all structural units constituting polyolefin (B).

[0042] Specific examples of the α-olefin having 3 to 20 carbon atoms to be copolymerized include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-hexene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicosene. These olefins can be used alone or in combination of two or more.

[0043] When the polyolefin (B) is a copolymer, the lower limit of the content of structural units derived from branched α-olefins having 5 to 20 carbon atoms is preferably 50 mol%, more preferably 70 mol%, even more preferably 80 mol%, particularly preferably 90 mol%, and even more preferably 95 mol%, and the upper limit is preferably 99.95 mol%, more preferably 99.9 mol%, and even more preferably 99.8 mol%.

[0044] The polyolefin (B) is preferably a 4-methyl-1-pentene homopolymer or a 4-methyl-1-pentene copolymer having a 4-methyl-1-pentene-derived structural unit as the main structural unit.

[0045] In addition, in the present invention, the structural units constituting the polyolefin (B) may include, in addition to the above-mentioned olefins, cyclic olefins, functionalized vinyl compounds, monomers having polar groups (e.g., carbonyl groups, hydroxyl groups, ether bond groups, etc.) and polymerizable carbon-carbon double bonds in the molecule, conjugated dienes, non-conjugated polyenes, etc., within the scope of the present invention.

[0046] The polyolefin (B) of the present invention satisfies the following requirement (Bi), and preferably further satisfies requirement (B-ii).

[0047] [Requirement (Bi)] The melting point (Tm) of the polyolefin (B) is 225°C or higher, preferably 227°C or higher, more preferably 228°C or higher, even more preferably 229°C or higher, and particularly preferably 230°C or higher. The upper limit of the melting point (Tm) is not particularly limited, but is, for example, 300°C or lower. When the melting point of the polyolefin (B) is within the above range, the strength of the polyolefin (B) itself is high regardless of the use temperature of the product, and the strength of the resulting crosslinked product of the resin composition (X) also tends to be high. Furthermore, when the melting point of the polyolefin (B) is within the above range, the modulus of the crosslinked product obtained from the resin composition (X) tends to be appropriately high. Therefore, when used in hose products or cable products, the crosslinked product obtained from the resin composition (X) having the polyolefin (B) melting point within the above range tends to have both the strength and flexibility required for these applications. The melting point of the polyolefin (B) can be measured in a nitrogen atmosphere in a temperature range of 30 to 280° C. using a differential scanning calorimeter (DSC) in accordance with JIS-K7121:2012. In this case, the heating rate and cooling rate may each be 10° C. / min.

[0048] [Requirement (B-ii)] The melt flow rate (MFR) is 1 to 500 g / 10 min, preferably 5 to 300 g / 10 min, more preferably 10 to 100 g / 10 min, even more preferably 15 to 50 g / 10 min, and particularly preferably 20 to 30 g / 10 min. The MFR is measured in accordance with ASTM D1238 under conditions of a measurement temperature of 260°C and a load of 5 kgf. When the MFR is within the above range, the fluidity of the resulting resin composition (X) in a molding die is improved.

[0049] The polyolefin (B) is produced by (co)polymerizing at least one olefin selected from α-olefins having 3 to 20 carbon atoms in the presence of a known olefin polymerization catalyst such as a Ziegler-Natta catalyst, a metallocene catalyst, or a so-called postmetallocene catalyst. The polyolefin (B) can be produced, for example, by the method described in JP 2013-245305 A. The content of polyolefin (B) in resin composition (X) is preferably 4 to 80 parts by mass, more preferably 7 to 60 parts by mass, even more preferably 10 to 50 parts by mass, and particularly preferably 10 to 40 parts by mass, per 100 parts by mass of copolymer (A). When the content of the polyolefin (B) is within the above range, the resin composition (X) and the crosslinked body obtained from the resin composition (X) tend to have excellent heat resistance.

[0050] The polyolefin (B) may contain structural units derived from at least one biomass-derived monomer. The biomass-derived monomer used as a raw material for the polyolefin (B) may be a biomass-derived branched α-olefin having 5 to 20 carbon atoms, or a biomass-derived α-olefin having 3 to 20 carbon atoms (excluding branched α-olefins having 5 to 20 carbon atoms). An example of the biomass-derived branched α-olefin having 5 to 20 carbon atoms is biomass-derived 4-methyl-1-pentene. The monomers used as raw materials for the polyolefin (B) may contain only biomass-derived monomers, or may contain both biomass-derived monomers and fossil fuel-derived monomers. The biomass-derived monomers contained in the polyolefin (B) are obtained by known methods. It is preferable that the polyolefin (B) contains structural units derived from biomass-derived monomers from the viewpoint of reducing the environmental load.

[0051] The polyolefin (B) may contain at least one structural unit derived from a chemically recycled monomer. The chemically recycled monomer used as the raw material for the polyolefin (B) may be a branched α-olefin having 5 to 20 carbon atoms derived from chemical recycling, or may be an α-olefin having 3 to 20 carbon atoms derived from chemical recycling (excluding branched α-olefins having 5 to 20 carbon atoms). Furthermore, the monomer used as the raw material for the polyolefin (B) may contain only a chemically recycled monomer, or may contain both a chemically recycled monomer and a fossil fuel-derived monomer. Chemically recycled monomers such as ethylene derived from chemical recycling and 4-methyl-1-pentene derived from chemical recycling can be obtained by known methods. It is preferable that the polyolefin (B) contains a structural unit derived from a chemically recycled monomer from the viewpoint of reducing the environmental load (mainly reducing waste).

[0052] <Reinforcing material (C)> The reinforcing material (C) may be any of those used as reinforcing materials for synthetic rubber. Examples of the reinforcing material (C) include carbon black, silica, activated calcium carbonate, light calcium carbonate, heavy calcium carbonate, finely divided talc, finely divided silicic acid, talc, clay, and inorganic materials whose surfaces have been treated with a silane coupling agent or the like. The reinforcing material (C) contained in the resin composition (X) preferably contains carbon black, because it is easy to improve the strength of the molded article obtained from the resin composition (X) and it is possible to obtain a rubber molded article having superior abrasion resistance. The reinforcing material (C) contained in the resin composition (X) may be one type or two or more types.

[0053] The content of the reinforcing material (C) in the resin composition (X) is preferably 1 to 300 parts by mass, more preferably 30 to 300 parts by mass, even more preferably 100 to 250 parts by mass, particularly preferably 150 to 200 parts by mass, and especially preferably 160 to 180 parts by mass, relative to 100 parts by mass of the copolymer (A). When the content of the reinforcing material (C) is within the above range, the dispersibility of the reinforcing material (C) in the resulting resin composition (X) and the kneading processability of the resin composition (X) are excellent, and the crosslinked product obtained from the resin composition (X) has excellent rubber elasticity and strength. Furthermore, the modulus of the crosslinked product obtained from the resin composition (X) tends to be suitably high. Therefore, when used in hose products or cable products, the crosslinked product obtained from the resin composition (X) having a content of the reinforcing material (C) within the above range tends to have both the strength and flexibility required for these applications.

[0054] [Carbon black] The carbon black used as the reinforcing material (C) is not particularly limited, and examples thereof include carbon black from SRF (Semi Reinforcing Furnace), GPF (General Purpose Furnace), FEF (Fast Extruding Furnace), MAF (Medium Abrasion Furnace), HAF (High Abrasion Furnace), ISAF (Intermediate Super Abrasion Furnace), SAF (Super Abrasion Furnace), FT (Fine Thermal), and MT (Medium Thermal).

[0055] Commercially available carbon blacks include, for example, "Asahi #50," "Asahi #55," "Asahi #60," "Asahi #60H," "Asahi #70," "Asahi #80," "Asahi #90," and "Asahi #15" (all trade names manufactured by Asahi Carbon Co., Ltd.), "Seat SO," "Seat 116," "Seat 3," "Seat 6," "Seat 7HM," and "Seat 9" (all trade names manufactured by Tokai Carbon Co., Ltd.).

[0056] The carbon black used as the reinforcing material (C) preferably has an average particle size on a number basis of 20 to 100 nm, more preferably 25 to 60 nm, and even more preferably 30 to 50 nm. When carbon black having an average particle size within the above range is used, a composition with excellent processability can be easily obtained, and the rubber molded article obtained can be further reinforced. The average particle size (by number) of the carbon black can be measured using an electron microscope. The content of carbon black used as the reinforcing material (C) in the resin composition (X) is preferably 1 to 300 parts by mass, more preferably 50 to 250 parts by mass, even more preferably 70 to 200 parts by mass, particularly preferably 80 to 150 parts by mass, and even more preferably 85 to 100 parts by mass, relative to 100 parts by mass of the copolymer (A).

[0057] <Other ingredients> In addition to the copolymer (A), polyolefin (B), and reinforcing material (C), the resin composition (X) may contain other additives, provided that the object of the present invention is not impaired. Examples of such additives include thermoplastic resins such as other polyolefin-based resins (excluding the copolymer (A) and polyolefin (B)), crosslinking agents (D), crosslinking aids, and resin additives (e.g., stabilizers such as heat stabilizers and weather stabilizers, antistatic agents, slip agents, antiblocking agents, processing aids, antifogging agents, lubricants, dyes, mineral oil-based softeners, petroleum resins, waxes, etc.). These other additives may be used singly or in combination of two or more.

[0058] The other polyolefin resin that can be contained in the resin composition (X) may be a polypropylene polymer. When the resin composition (X) contains a polypropylene polymer, the content of the polypropylene polymer is preferably less than 5 parts by mass, more preferably 3 parts by mass or less, and even more preferably 1 part by mass or less, per 100 parts by mass of the copolymer (A).

[0059] When the other components are contained, the total amount of the other components in the resin composition (X) is usually 60% by mass or less, preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 30% by mass or less, and particularly preferably 20% by mass or less. In other words, the proportion of the total mass of the copolymer (A), polyolefin (B), and reinforcing material (C) in the resin composition (X) to the mass of the resin composition (X) is usually 40% by mass or more, preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, and particularly preferably 80% by mass or more.

[0060] <Crosslinking agent (D)> Examples of the crosslinking agent (D) include crosslinking agents commonly used in crosslinking rubber, such as organic peroxides, phenolic resins, hydrosilicone compounds, amino resins, quinones or their derivatives, amine compounds, azo compounds, epoxy compounds, and isocyanate compounds. Among these, organic peroxides are preferred. The crosslinking agent (D) contained in the resin composition (X) may be one type or two or more types.

[0061] Examples of organic peroxides include dicumyl peroxide (DCP), di-tert-butyl peroxide, 2,5-di-(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexyne-3, 1,3-bis(tert-butylperoxyisopropyl)benzene, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl-4,4-bis(tert-butylperoxy)valerate, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butyl peroxybenzoate, ert-butylperoxyisopropyl carbonate, diacetyl peroxide, lauroyl peroxide, and tert-butylcumyl peroxide.

[0062] Among these, dicumyl peroxide, 2,5-di-(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexyne-3, 1,3-bis(tert-butylperoxyisopropyl)benzene, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl-4,4-bis(tert-butylperoxy)valerate, and the like are preferred, and among these, dicumyl peroxide, 2,5-di-(tert-butylperoxy)hexane, and 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane are more preferred, with dicumyl peroxide being even more preferred.

[0063] When an organic peroxide is used as the crosslinking agent (D), the blending amount thereof is generally 0.1 to 20 parts by mass, preferably 0.2 to 15 parts by mass, more preferably 0.5 to 10 parts by mass, and particularly preferably 1.0 to 5 parts by mass, per 100 parts by mass of the total of the copolymer (A), the polyolefin (B), and other polymers that require crosslinking, which are blended as needed. When the blending amount of the organic peroxide is within the above range, it is preferable because the resin composition (X) exhibits excellent crosslinking properties.

[0064] When an organic peroxide is used as the crosslinking agent (D), it is preferable to use a crosslinking aid in combination. Examples of crosslinking aids include sulfur; quinone dioxime crosslinking aids such as p-quinone dioxime; acrylic crosslinking aids such as ethylene glycol dimethacrylate and trimethylolpropane trimethacrylate; allyl crosslinking aids such as diallyl phthalate and triallyl isocyanurate; maleimide crosslinking aids; divinylbenzene; and metal oxides such as zinc oxide (e.g., ZnO#1 / Zinc Oxide Type 2 (JIS Standard (K-1410)), manufactured by Hakusui Tech Co., Ltd.), magnesium oxide, and zinc oxide (e.g., zinc oxide such as "META-Z102" (trade name: manufactured by Inoue Lime Industry Co., Ltd.)). The amount of crosslinking aid added is usually 0.5 to 10 moles, preferably 0.5 to 7 moles, and more preferably 1 to 5 moles, per mole of organic peroxide.

[0065] <Method for producing resin composition (X)> The resin composition (X) can be produced by mixing and kneading the copolymer (A), the polyolefin (B), and the reinforcing material (C), and, if necessary, one or more additives selected from the group consisting of the other additives described above. For this mixing and kneading, it is preferable to use a conventionally known mixer / kneader such as a Banbury mixer, a mixing roll, a Henschel mixer, a kneader, a single-screw or twin-screw extruder, etc. The order of addition of each component for this mixing and kneading is not particularly limited.

[0066] <Physical Properties of Resin Composition (X)> The Mooney viscosity [ML (1+4) 125°C] is preferably 10 to 150, more preferably 30 to 100, further preferably 50 to 80, and particularly preferably 60 to 70. The Mooney viscosity [ML (1+4) 125°C] is in the above range, the processability in molding is good.

[0067] When a crosslinking treatment is performed on an uncrosslinked sheet of a given mass of resin composition (X) under conditions of a constant temperature and a constant shear rate, the time (tC90) from the start of the crosslinking treatment until the torque of the sheet to be crosslinked reaches 90% of the maximum torque (S'Max [dNm]) is preferably 3 to 20 minutes, more preferably 4 to 14 minutes, even more preferably 5 to 10 minutes, and particularly preferably 6 to 8 minutes. When tC90 is within the above range, the time required for the crosslinking treatment is not too long, making it easy to produce a crosslinked product. Note that a smaller tC90 indicates a faster vulcanization rate (crosslinking rate). Specific methods for measuring tC90 are described in the Examples below.

[0068] When an uncrosslinked sheet of resin composition (X) is subjected to a crosslinking treatment under conditions of a constant temperature and a constant shear rate, the difference (S'Max - Min [dNm]) between the maximum torque (S'Max) and the minimum torque (S'Min [dNm]) is preferably 4 to 20 [dNm], more preferably 6 to 15 [dNm], even more preferably 8 to 13 [dNm], and particularly preferably 9 to 11 [dNm]. Generally, the smaller S'Max - Min, the lower the degree of crosslinking of the crosslinked product. When S'Max - Min is within the above range, a crosslinked product with an excellent balance of strength and flexibility can be obtained. A specific method for measuring S'Max - Min will be described in the Examples below.

[0069] <Method for producing crosslinked resin composition (X)> The crosslinked product of the present invention is obtained by crosslinking the resin composition (X). A method for producing a crosslinked product from resin composition (X) includes, for example, molding resin composition (X) into a desired shape (e.g., a sheet) and crosslinking the resin composition (X) simultaneously with or after molding. An example of a method for crosslinking the resin composition (X) is a method in which the resin composition (X) is heated to crosslink the resin composition (X).

[0070] Specifically, the crosslinked product of resin composition (X) can be produced by molding resin composition (X) into the intended shape using a molding machine such as an extruder, calendar roll, press molding machine, injection molding machine, or transfer molding machine, and crosslinking the composition by heating it at a temperature of typically 120 to 270°C, preferably 140 to 230°C, for 1 to 30 minutes, either simultaneously with molding or simultaneously with molding. The lower limit of the temperature range is preferably 150°C, and even more preferably 160°C, and the upper limit is preferably 220°C, and even more preferably 200°C. Resin composition (X) can be molded and crosslinked by various molding methods, but its properties can be best exhibited when molded and crosslinked by molding methods such as compression molding, injection molding, and cast molding.

[0071] In the case of compression molding, for example, a pre-weighed amount of uncrosslinked resin composition (X) is placed in a mold, and after closing the mold, the mixture is heated at a temperature of 120 to 270°C for 30 seconds to 120 minutes to obtain the desired crosslinked product.

[0072] In the case of injection molding, for example, a preset amount of ribbon-shaped or pellet-shaped resin composition (X) is fed into a pot using a screw. Subsequently, preheated resin composition (X) is fed into a mold using a plunger over 1 to 20 seconds. After the resin composition (X) is injected, it is heated at a temperature of 120 to 270°C for 30 seconds to 120 minutes to obtain the desired crosslinked product.

[0073] In the case of injection molding, for example, a pre-weighed amount of resin composition (X) is placed in a pot and injected into a mold using a piston over 1 to 20 seconds. After the resin composition (X) is injected, it is heated at a temperature of 120 to 270°C for 30 seconds to 120 minutes to obtain the desired crosslinked product.

[0074] <Physical Properties of Crosslinked Resin Composition (X)> The Durometer A hardness (Shore A hardness, instantaneous value measured in accordance with the measurement method of JIS K 6253) of the crosslinked product of resin composition (X) is preferably 40 to 110, more preferably 50 to 100, even more preferably 60 to 90, and particularly preferably 70 to 80. When the Durometer A hardness is within the above range, the crosslinked product obtained from resin composition (X) has sufficient rubber elasticity even when used in hose products or cable coating materials. Specifically, the Durometer A hardness can be measured by the method described in the examples below.

[0075] The modulus of the crosslinked resin composition (X) when stretched 25%, measured in accordance with the measurement method of JIS K 6251 (hereinafter also referred to as "25% modulus" or "M25"), is preferably 0.50 to 5.0 MPa, more preferably 1.0 to 4.5 MPa, even more preferably 1.3 to 4.0 MPa, and particularly preferably 1.5 to 3.5 MPa. When the 25% modulus is within the above range, the crosslinked resin has an excellent balance between strength and flexibility. Specifically, the 25% modulus can be measured by the method described in the examples below.

[0076] The modulus of the crosslinked resin composition (X) when stretched 50%, measured in accordance with the measurement method of JIS K 6251 (hereinafter also referred to as "50% modulus" or "M50"), is preferably 1.0 to 6.0 MPa, more preferably 1.5 to 5.5 MPa, even more preferably 1.8 to 5.0 MPa, and particularly preferably 2.0 to 4.5 MPa. When the 50% modulus is within the above range, the crosslinked resin has an excellent balance of strength and flexibility when stretched 50% in length. Specifically, the 50% modulus can be measured by the method described in the examples below.

[0077] The modulus (hereinafter also referred to as "100% modulus" or "M100") of a crosslinked resin composition (X) when stretched 100%, measured in accordance with the measurement method of JIS K 6251, is preferably 2.0 to 7.0 MPa, more preferably 2.5 to 6.5 MPa, even more preferably 2.8 to 6.0 MPa, and particularly preferably 3.0 to 5.5 MPa. When the 100% modulus is within the above range, the crosslinked product has an excellent balance of strength and flexibility when stretched 100%. Furthermore, when used in hose products or cable products, crosslinked products having a 100% modulus within the above range tend to possess both the strength and flexibility required for these applications. Specifically, the 100% modulus can be measured by the method described in the examples below.

[0078] The tensile stress at break (TB) of the crosslinked product of resin composition (X), measured in accordance with the measurement method of JIS K 6251, is preferably 5.0 to 13.0 MPa, more preferably 6.0 to 12.0 MPa, even more preferably 7.0 to 11.0 MPa, and particularly preferably 8.0 to 10.0 MPa. When the tensile stress at break is within the above range, the crosslinked product has an excellent balance between strength and flexibility. Specifically, the tensile stress at break can be measured by the method described in the examples below.

[0079] The tensile elongation at break (EB) of the crosslinked product of resin composition (X), measured in accordance with the measurement method of JIS K 6251, is preferably 250 to 500%, more preferably 300 to 450%, even more preferably 315 to 425%, and particularly preferably 330 to 400%. When the tensile elongation at break is within the above range, the crosslinked product has excellent rubber elasticity. Specifically, the tensile elongation at break can be measured by the method described in the examples below.

[0080] The storage modulus (E') of the crosslinked resin composition (X) at 180°C 180℃ The storage modulus (E') is preferably 2.0 MPa or more, more preferably 2.5 MPa or more, even more preferably 3.0 MPa or more, and particularly preferably 3.5 MPa or more. 180℃ ) is not particularly limited, but is, for example, 1000 MPa or less. If the storage modulus at 180°C is within the above range, the crosslinked product can be used even at 180°C. Specifically, the storage modulus at each temperature can be measured by the method described in the examples below.

[0081] The volume resistivity of the crosslinked resin composition (X) measured at a voltage of 10 V in accordance with the measurement method of JIS K 6911 (1995) is preferably 10 7 Ω·cm or more, preferably 10 8 The upper limit of the volume resistivity of the crosslinked body is not particularly limited, but for example, 10 18When the volume resistivity is within the above range, a crosslinked body having excellent electrical insulation properties can be obtained. Specifically, the volume resistivity can be measured by the method described in the examples below.

[0082] <Uses of the crosslinked resin composition (X)> A crosslinked body obtained from the resin composition (X) can be molded into a desired shape to obtain various products.

[0083] The crosslinked product of resin composition (X) has excellent electrical insulation properties, a high storage modulus even in high temperature ranges (i.e., excellent heat resistance), and a moderately high modulus, and therefore the crosslinked product of resin composition (X) can be suitably used for hoses, electric wires, cable coverings, other electric parts, etc. [Example]

[0084] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. In the following description of the examples, unless otherwise specified, "E+xx" represents "×10 xx " indicates.

[0085] <Ingredients> The raw materials used in the following examples and comparative examples are as follows.

[0086] <Copolymer (A)> "Copolymer (A-1)": ethylene-propylene-5-ethylidene-2-norbornene copolymer (EPT 3092PM manufactured by Mitsui Chemicals, Inc., content of ethylene-derived structural units (total of all structural units constituting copolymer (A-1) is 100 mol %) = 75.2 mol %, content of propylene-derived structural units (total of all structural units constituting copolymer (A-1) is 100 mol %) = 23.5 mol %, non-conjugated polyene species: 5-ethylidene-2-norbornene, non-conjugated polyene content = 4.6 mass %, Mooney viscosity (ML (1+4) 125℃)=61)

[0087] <Polyolefin (B)> "Polyolefin (B-1)": 4-methyl-1-pentene polymer (B) (RT18, manufactured by Mitsui Chemicals, Inc., MFR (260°C, 5 kg load) = 26 g / 10 min, melting point (Tm) = 232°C) "Polyolefin (cB-1)": Polypropylene (Prime Polymer J707G, MFR (230°C, 5 kg load) = 30 g / 10 min, melting point (Tm) = 150-165°C)

[0088] <Reinforcement (C)> "Reinforcing material (C-1)": Carbon black (Asahi Carbon Co., Ltd. Asahi #60UG (FEF)) "Reinforcement material (C-2)": Heavy calcium carbonate (Whiten SB manufactured by Shiraishi Calcium Co., Ltd.)

[0089] <Other ingredients> Crosslinking aid: Activated zinc oxide (META-Z manufactured by Inoue Lime Industry Co., Ltd.) Processing aid: Stearic acid (NOF Corporation's Tsubaki Stearic Acid Series) "Anti-aging agent 1": BASF Irganox 1010 "Anti-aging agent 2": Sandanto MB manufactured by Sanshin Chemical Industry Co., Ltd. "Softener": Paraffin-based process oil (Idemitsu Kosan PW-430) Crosslinking agent (D-1): Dicumyl peroxide (Percumyl D-40, manufactured by NOF Corporation)

[0090] Example 1 [Preparation of Resin Composition (X-1)] In the first step, 100 parts by mass of copolymer (A-1) and 20 parts by mass of polyolefin (B-1) were melt-kneaded using a single-screw extruder (50Φ single-screw extruder, L / D=30, manufactured by Tanabe Plastics Co., Ltd.) at a set temperature of 300°C and a screw rotation speed of 40 rpm. The pellets obtained were melt-kneaded again at a set temperature of 300°C and a screw rotation speed of 20 rpm to obtain a blend in which polyolefin (B-1) was dispersed in copolymer (A-1).

[0091] In the second step, 120 parts by mass of the compound obtained in the first step, 90 parts by mass of reinforcing material (C-1), 80 parts by mass of reinforcing material (C-2), 3 parts by mass of crosslinking aid, 1 part by mass of processing aid, 1 part by mass of antioxidant 1, 2 parts by mass of antioxidant 2, and 55 parts by mass of softener were kneaded using a batch kneader (Kobe Steel, Ltd.: BB-1800 Mixtron Mixer, volume: 1.63 L) to obtain an uncrosslinked resin composition (X-1). Kneading was performed at a rotor rotation speed of 36 rpm for a kneading time of 5 minutes and 30 seconds.

[0092] [Mooney viscosity (ML (1+4) 125℃) Mooney viscosity (ML) of resin composition (X-1) (1+4) The viscosity (at 125°C) was measured in accordance with JIS K6300-1:2013 using a Mooney viscometer (Model SMV202 manufactured by Shimadzu Corporation) under conditions of 125°C. The results are shown in Table 1.

[0093] [Preparation of Resin Composition (X-2)] In the third step, after confirming that the temperature of the resin composition (X-1) obtained in the second step had reached 40°C or less, 9.8 parts by mass of crosslinking agent (D-1) was kneaded using a 6-inch roll (manufactured by Nippon Roll Co., Ltd.) to obtain a resin composition (X-2). Thereafter, the obtained resin composition (X-2) was kneaded at a roll temperature of front roll / rear roll: 50°C / 50°C and a roll rotation speed of front roll / rear roll: 15 rpm / 18 rpm.

[0094] [Crosslinking (vulcanization) characteristic evaluation] A portion of the resin composition (X-2) was sampled, and the crosslinking (vulcanization) properties were evaluated by the following procedure. An uncrosslinked sheet was prepared using the collected resin composition (X-2). The resulting uncrosslinked sheet was used as a sample and the torque change obtained under constant temperature and constant shear rate conditions was measured using a vulcanization measuring device (ALPHA TECHNOLOGIES MDR2000). From the torque change obtained, the difference between the maximum torque S'Max [dNm] and the minimum torque S'Min [dNm] (S'Max-Min) was calculated. The minimum torque S'Min was defined as 0% and the maximum torque S'Max as 100%, and the time tC90 [min] at which the torque of the measured sample reached 90% was calculated. The measurement conditions were a temperature of 170°C, a time of 30 minutes, and a shear rate of 100 cycles / min (1.66 Hz). The results are shown in Table 1.

[0095] [Preparation of Crosslinked Resin Composition (X-2)] Resin composition (X-2) was crosslinked using a press molding machine at 170°C for 10 minutes to prepare 2 mm and 1 mm thick crosslinked sheets. The 2 mm thick sheets were used for hardness and tensile tests, and the 1 mm thick sheets were used for tensile viscoelasticity tests and volume resistivity tests.

[0096] [Evaluation of physical properties of crosslinked products] <Hardness test: Durometer A hardness (Shore A hardness)> The hardness of a 2 mm thick sheet of the crosslinked product was measured in accordance with the description of Test Type A in Section 6 of JIS K 6253 (2006) "Vulcanized rubber and thermoplastic rubber - Determination of hardness." The results are shown in Table 1.

[0097] <Tensile test: modulus, tensile stress at break, tensile elongation at break> The modulus, tensile stress at break and tensile elongation at break of a 1 mm thick sheet of the crosslinked product were measured by the following methods. The sheet was punched to prepare No. 3 dumbbell test pieces as described in JIS K 6251 (1993). Tensile tests were performed using these test pieces according to the method specified in JIS K 6251, Section 3, at a temperature of 25°C and a pulling rate of 500 mm / min. The tensile stress at 25% elongation (25% modulus (M25)), the tensile stress at 50% elongation (50% modulus (M50)), the tensile stress at 100% elongation (100% modulus (M100)), the tensile stress at break (TB), and the tensile elongation at break (EB) were measured. The results are shown in Table 1.

[0098] <Storage modulus E'> Dynamic viscoelasticity was measured for a 1 mm thick sheet of the crosslinked material under a nitrogen atmosphere using a TA-Instruments RSA-G2. Here, the storage modulus (E') is a term constituting the complex modulus, which expresses the relationship between stress and strain when a sinusoidal oscillatory strain is applied to a viscoelastic material, and is a value measured in tensile mode (strain 1%) in the temperature range of 0°C to 240°C, at a heating rate of 4°C / min, and at a frequency of 1 Hz. The results are shown in Table 1.

[0099] <Electrical properties (volume resistivity)> A 1 mm thick sheet of the crosslinked body was subjected to a volume resistivity test in accordance with JIS K 6911 (1995) to measure the volume resistivity of the crosslinked body. The results are shown in Table 1.

[0100] <Comparative Example 1> In Example 1, 20 parts by mass of reinforcing material (C-1) was blended instead of polyolefin (B-1), and the single-screw extruder step was omitted, and instead a resin composition (cX-1) was prepared by kneading in a batch kneader. Except for using resin composition (cX-1) instead of resin composition (X-1) in Example 1, the Mooney viscosity was measured, a crosslinking agent (D-1) was added, crosslinking characteristics were evaluated, and the physical properties of the crosslinked product were evaluated in the same manner as in Example 1. The obtained results are shown in Table 1.

[0101] <Comparative Example 2> In Example 1, 20 parts by mass of polyolefin (cB-1) was blended instead of polyolefin (B-1). 100 parts by mass of copolymer (A-1) and 20 parts by mass of polyolefin (cB-1) were melt-kneaded using a single-screw extruder at a set temperature of 280°C and a screw rotation speed of 30 rpm. This resulted in a blend in which polyolefin (cB-1) was dispersed in copolymer (A-1). 120 parts by mass of the resulting blend, 90 parts by mass of reinforcing material (C-1), 80 parts by mass of reinforcing material (C-2), 3 parts by mass of crosslinking aid, 1 part by mass of processing aid, 1 part by mass of antioxidant 1, 2 parts by mass of antioxidant 2, and 55 parts by mass of softener were kneaded to obtain an uncrosslinked resin composition (cX-2). Except for using resin composition (cX-2) instead of resin composition (X-1) in Example 1, measurement of Mooney viscosity, addition of crosslinking agent (D-1), evaluation of crosslinking characteristics, and evaluation of physical properties of the crosslinked product were carried out in the same manner as in Example 1. The obtained results are shown in Table 1.

[0102] [Table 1]

Claims

1. an ethylene / α-olefin / non-conjugated polyene copolymer (A) having structural units derived from ethylene (a1), structural units derived from an α-olefin (a2) having 3 to 20 carbon atoms, and structural units derived from a non-conjugated polyene (a3); A polyolefin (B), A reinforcing material (C); Including, The polyolefin (B) contains a structural unit derived from at least one olefin selected from branched α-olefins having 5 to 20 carbon atoms, The resin composition (X), wherein the melting point of the polyolefin (B) (based on the measurement method of JIS K 7121:2012) is 225°C or higher.

2. The resin composition (X) according to claim 1, wherein the polyolefin (B) has a content of structural units derived from at least one olefin selected from branched α-olefins having 5 to 20 carbon atoms of 50 to 100 mol %.

3. The resin composition (X) according to claim 1, wherein the copolymer (A) satisfies all of the following requirements (A-i) to (A-iii): (A-i) the Mooney viscosity measured at 125°C (in accordance with the measurement method of JIS K6300-1:2013) is 5 to 200; (A-ii) the molar ratio of the structural units derived from ethylene (a1) to the structural units derived from the α-olefin (a2) [(a1) / (a2)] is 40 / 60 to 90 / 10; (A-iii) The content of the structural units derived from the non-conjugated polyene (a3) ​​is 1.0 to 20.0% by mass, relative to 100% by mass of all structural units constituting the copolymer (A).

4. The resin composition (X) according to claim 1, wherein the non-conjugated polyene (a3) ​​is 5-ethylidene-2-norbornene or 5-vinyl-2-norbornene.

5. The resin composition (X) according to claim 1, wherein the polyolefin (B) comprises a 4-methyl-1-pentene polymer.

6. The resin composition (X) according to claim 5, wherein the 4-methyl-1-pentene polymer contains 90 mol% or more of structural units derived from 4-methyl-1-pentene.

7. The resin composition (X) according to claim 1, wherein the polyolefin (B) has a melt flow rate (measured in accordance with ASTM D1238, 260 ° C., 5 kg load) of 1 to 500 g / 10 min.

8. The resin composition (X) according to claim 1, wherein the content of the polyolefin (B) is 4 to 80 parts by mass relative to 100 parts by mass of the copolymer (A).

9. The resin composition (X) according to claim 1, wherein the reinforcing material (C) contains carbon black.

10. The resin composition (X) according to claim 1, wherein the content of the reinforcing material (C) is 1 to 300 parts by mass relative to 100 parts by mass of the copolymer (A).

11. The resin composition (X) according to claim 1, further comprising a crosslinking agent (D).

12. A crosslinked product of the resin composition (X) according to any one of claims 1 to 11.

13. Volume resistivity (measured according to JIS K 6911 (1995)) is 10 ７ The crosslinked body according to claim 12, having a resistance of Ω·cm or more.

14. A hose product comprising the crosslinked body according to claim 12.

15. A cable coating material comprising the crosslinked product according to claim 12.

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