Moulded body and method for producing moulded body

Abstract

Provided are: a moulded body that contains, as a raw material, a resin composition containing a 3-methyl-1-butene-based polymer, the moulded body being a tube or a coating material, the surface roughness Ra of the outer surface of the moulded body is 1,000 nm or less; and a method for producing the moulded body.

Description

Molded body and method for manufacturing the same

[0001] The present invention relates to a molded body and a method for manufacturing the molded body.

[0002] Thermoplastic resins have good moldability and are therefore used to manufacture molded articles of various shapes. Among these, tubes and coating materials made from thermoplastic resins are used in a wide range of fields and are important components in industry and daily life. Depending on their applications, tubes and coating materials are required to have insulating properties and chemical resistance. Therefore, fluororesins, which have excellent insulating properties and chemical resistance, have been used as molding materials for tubes and coating materials.

[0003] For example, Patent Document 1 discloses a tube containing a tetrafluoroethylene / fluoroalkyl vinyl ether copolymer, in which the number of functional groups of the copolymer is 500 or less per 106 carbon atoms, the melting point of the copolymer is 280 to 315°C, the content of fluoroalkyl vinyl ether units of the copolymer is 3.0 to 12.0 mass% based on the total mass of monomer units, the melt flow rate of the copolymer is 1 to 15 g / 10 min, and the number of particles released from the inner surface of the tube is 100 to 1500 per cm of the inner surface area of ​​the tube. ２ The amount of total organic carbon eluted into water from the inner surface of the tube is 3,500 or less per 1 cm of the inner surface area of ​​the tube. ２ For example, Patent Document 2 discloses an insulated wire that includes a conductor and a fluororesin layer that is formed on the conductor and contains a melt-processable fluororesin, and that has a peel strength of 0.30 N / mm or more as measured by peeling the fluororesin layer from the conductor.

[0004] JP 2024-039638 A JP 2024-031961 A

[0005] However, in recent years, with the EU considering PFAS (PFAS is an abbreviation for Per and Poly fluoroalkyl substances) regulations, alternative materials to fluororesins are desired. Furthermore, because fluororesins require special molding equipment due to their corrosive properties, molding materials that can be molded using more general-purpose equipment are desired. Meanwhile, tubes or coating materials made from conventionally widely used polyolefins such as polyethylene and polypropylene have not been found to have sufficient insulating properties and chemical resistance. Therefore, the present invention aims to provide a molded product having good insulating properties and chemical resistance, and a method for manufacturing such a molded product.

[0006] As a result of extensive research, the present inventors have found that the above-mentioned problems can be solved by using a specific resin composition as a raw material and setting the surface roughness Ra of the outer surface of the tube and the covering material within a predetermined range. That is, the present invention encompasses the following inventions. [1] A molded article containing a resin composition containing a 3-methyl-1-butene polymer as a raw material, the molded article being a tube or a covering material, the outer surface of the molded article having a surface roughness Ra of 1,000 nm or less. [2] The molded article according to [1] above, wherein the outer surface has a surface roughness Ra of 500 nm or less. [3] The molded article according to [1] or [2] above, wherein the weight change rate after immersion in chloroform at 23°C for one week, as measured in accordance with JIS K 7114:2001, is less than 70%. [4] The molded article according to any one of [1] to [3] above, wherein the dielectric breakdown strength is 28 kV / mm or more. [5] The molded article according to any one of [1] to [4] above, having a storage modulus E' of 50 MPa or more at 150°C and a storage modulus E' of 1 MPa or more at 270°C. [6] The molded article according to any one of [1] to [5] above, having a storage modulus E' of 1,000 MPa or less at 70°C. [7] The molded article according to any one of [1] to [6] above, having a multilayer structure including a layer formed from a resin composition containing the 3-methyl-1-butene polymer. [8] The molded article according to any one of [1] to [7] above, wherein the resin composition contains an antioxidant. [9] The molded article according to [8] above, wherein the antioxidant is at least one selected from the group consisting of phenolic antioxidants and phosphorus-based antioxidants.

[10] A method for producing the molded article according to any one of [1] to [9] above, comprising: a step (I) of melt-extruding the resin composition.

[11] The method for producing a molded article according to the above

[10] , wherein the resin composition is melted in an inert atmosphere or in a low-oxygen state during the step (I).

[12] The method for producing a molded article according to the above

[10] or

[11] , wherein the resin composition is melted at 280 to 325°C during the step (I).

[13] The method for producing a molded article according to any one of

[10] to

[12] above, wherein in the step (I), a draw-down ratio [D / E], which is the ratio of a lip gap thickness (D) of a die for melt-extruding the molten resin composition to a wall thickness (E) of a molded article formed by extrusion from the die, is 1 to 10.

[0007] According to the present invention, it is possible to provide a molded article having good insulating properties and chemical resistance, and a method for producing the molded article.

[0008] The following describes examples of embodiments of the present invention (hereinafter also referred to as "one aspect of the present invention"). However, each embodiment described below is merely an example for embodying the technical concept of the present invention, and the present invention is not limited to the following description. The present invention also includes embodiments in which any of the descriptions herein are arbitrarily selected or arbitrarily combined. Although preferred embodiments are described herein, combinations of two or more of the individual preferred embodiments are also preferred. Preferred specifications can be selected arbitrarily; for example, combinations of preferred specifications can be considered more preferable. Unless otherwise specified, the term "XX to YY" used herein as a numerical range means "XX or more and YY or less" (XX represents the lower limit and YY represents the upper limit). For example, simply describing a numerical range as "10 to 90" means a range of 10 or more and 90 or less. In this specification, the lower and upper limits of numerical ranges (such as characteristic values, component contents, structural unit contents, production conditions, and values ​​calculated therefrom, characteristics, and conditions) described in stages can be independently combined. For example, from a description of "preferably 10 to 90, more preferably 30 to 60" for the same item, the "preferable lower limit (10)" and the "more preferable upper limit (60)" can be combined to form "10 to 60." Furthermore, for a numerical range, for example, based on the description of "preferably 10 to 90, more preferably 30 to 60," the upper limit can be specified as "10 or more" or "30 or more" without a particular upper limit. Similarly, the upper limit can be specified as "90 or less" or "60 or less" without a particular lower limit. The same applies when the upper end of the numerical range is "less than" or when the lower limit is "over." Similarly, for example, from a description of "preferably 10 or more, more preferably 30 or more" for the same item and "preferably 90 or less, more preferably 60 or less," the "preferable lower limit (10)" and the "more preferable upper limit (60)" can be combined to form "10 or more and 60 or less." Similarly, the lower limit value alone can be specified as "10 or more" or "30 or more," and similarly, the upper limit value alone can be specified as "90 or less" or "60 or less."The same applies when the expressions "more than or equal to" and "less than or equal to" in the above description are written as "more than" and "less than," respectively. That is, for example, based on the description "preferably more than 10 and less than 90, more preferably 30 or more and 60 or less," the upper and lower limits can be combined to form "more than 10 and 60 or less" or "30 or more and less than 90."

[0009] [Molded Article] The molded article of the present invention is a molded article containing a resin composition containing a 3-methyl-1-butene polymer as a raw material, the molded article being a tube or a coating material, and the molded article having an outer surface with a surface roughness Ra of 1,000 nm or less. In the following description, the 3-methyl-1-butene polymer may be referred to as "P3MB."

[0010] By satisfying the above-mentioned requirements, the molded article of the present invention can have good insulating properties and chemical resistance. Although the reason for this is unclear, the molded article of the present invention has excellent insulating properties and chemical resistance because it contains a resin composition containing P3MB as a raw material. Furthermore, it is presumed that the surface roughness Ra of the outer surface is 1,000 nm or less, which reduces the specific surface area and suppresses local electric field concentration caused by surface irregularities, resulting in good insulating properties.

[0011] In this specification, the term "tube" refers to a molded body having a cylindrical structure, with the hollow surface of the cylindrical structure being the inner surface and the opposite surface being the outer surface. In this specification, the term "coating material" refers to a molded body that coats an object to be coated. The surface of the coating material that is not in contact with the object to be coated is the outer surface, and the surface that is in contact with the object to be coated is the coated surface. The coated surface after the coating material is peeled off from the object to be coated is referred to as the "inner surface." The "coating material" may be any material that coats at least a portion of the object to be coated, and the form is not particularly limited. However, it is preferably a coating material that coats the outer periphery of a linear object such as a conductor. Here, the state of "coating the outer periphery of a linear object" refers to a state in which, when the linear object is cross-sectionally viewed along any plane perpendicular to the longitudinal direction, the entire outer edge of the conductor in at least one cross section is covered by the coating material.

[0012] <Surface roughness Ra of molded article> The surface roughness Ra of the outer surface of the molded article of the present invention is 1,000 nm or less. As described above, the molded article of the present invention has good insulating properties when the surface roughness Ra of the outer surface is 1,000 nm or less. From the viewpoint of further improving insulating properties, the surface roughness Ra of the outer surface of the molded article of the present invention is preferably 500 nm or less, more preferably 400 nm or less, even more preferably 300 nm or less, and even more preferably 200 nm or less. From the viewpoint of adhesion with members that come into contact with the molded article, the surface roughness Ra of the outer surface of the molded article of the present invention may be 10 nm or more, 20 nm or more, 30 nm or more, 40 nm or more, 50 nm or more, 80 nm or more, or 100 nm or more. The surface roughness Ra of the outer surface of the molded article can be measured by the method described in the examples.

[0013] Furthermore, from the viewpoint of further improving the insulating properties, the surface roughness of the inner surface of the molded article of the present invention is preferably 1,000 nm or less, more preferably 500 nm or less, even more preferably 400 nm or less, even more preferably 300 nm or less, and even more preferably 200 nm or less. From the viewpoint of adhesion with members that come into contact with the molded article, the surface roughness Ra of the inner surface of the molded article of the present invention may be 10 nm or more, 20 nm or more, 30 nm or more, 40 nm or more, 50 nm or more, 80 nm or more, or 100 nm or more. The surface roughness Ra of the inner surface of the molded article can be measured by the method described in the examples.

[0014] <Layer Structure of Molded Article> The molded article of the present invention may be a tube or coating material having a single-layer structure formed from a resin composition containing P3MB, or may be a tube or coating material having a multilayer structure including a layer formed from a resin composition containing P3MB. When the molded article of the present invention has a multilayer structure, the number of layers is not particularly limited, but may be, for example, 2 to 5 layers. The layers included in the molded article having a multilayer structure may all be layers formed from a resin composition containing P3MB, or may include a layer formed from a resin composition containing P3MB and a layer formed from a resin composition not containing P3MB. An example of a layer structure when a molded article having a multilayer structure includes a layer formed from a resin composition containing P3MB and a layer formed from a resin composition not containing P3MB is shown below. In the following layer structures, "Layer A" refers to a "layer formed from a resin composition containing P3MB," and "Layer B" refers to a "layer formed from a resin composition not containing P3MB." (Layer structure) 2 layers: A layer / B layer 3 layers: A layer / B layer / B layer, B layer / A layer / B layer, A layer / A layer / B layer, or A layer / B layer / A layer 4 layers: A layer / B layer / B layer / B layer, B layer / A layer / B layer / B layer, A layer / A layer / B layer / B layer, A layer / B layer / A layer / B layer, A layer / B layer / A layer / B layer, A layer / B layer / B layer / A layer, B layer / A layer / A layer / B layer, A layer / A layer / A layer / B layer, A layer / A layer / A layer / B layer 5 layers: A layer / B layer / B layer / B layer / B layer, B layer / A layer / B layer / B layer / B layer, B layer / B layer / A layer / B layer / B layer, A layer / A layer / B layer / B layer / B layer, A layer / B layer / A layer / B layer / B layer, A layer / B layer / B layer / A layer / B layer, A layer / B layer / B layer / B layer / A layer, B layer / A layer / A layer / B layer / B layer, B layer / A layer / B layer / layer A / layer B, layer A / layer A / layer A / layer B / layer B, layer A / layer A / layer B / layer A / layer A / layer B / layer A / layer A / layer A / layer B / layer A / layer A / layer A / layer B / layer B / layer A, layer A / layer B / layer A / layer A / layer A / layer B / layer A / layer B / layer A / layer B / layer A / layer A / layer A / layer A / layer A / layer A / layer A / layer A / layer A / layer A / layer A / layer B / layer A / layer A / layer A / layer A / layer A / layer B / layer A / layer A / layer A / layer A / layer B / layer A / layer A / layer A / layer A / layer B / layer A / layer A / layer A / layer A / layer A / layer B / layer A / layer AFurthermore, the inner surface and the coated surface of the molded article having a multilayer structure may be the surface of either layer A or layer B, but is preferably the surface of layer A from the viewpoint of easily obtaining good insulation and chemical resistance. When the molded article having a multilayer structure has multiple layers A, the compositions and structures of the multiple layers A may be the same or different. When the molded article having a multilayer structure has multiple layers B, the compositions and structures of the multiple layers B may be the same or different.

[0015] <Thickness of Molded Article, etc.> The thickness of the molded article of the present invention is not particularly limited and can be appropriately set depending on the application. From the viewpoints of moldability, handleability, etc., it is preferably 0.01 to 20 mm, more preferably 0.05 to 10 mm, even more preferably 0.2 to 5 mm, and even more preferably 0.5 to 3 mm. When the molded article of the present invention is a tube, the thickness refers to the wall thickness between the outer surface and the inner surface of the tube. When the molded article of the present invention is a coating material, the thickness refers to the wall thickness between the outer surface and the coating surface of the coating material. The thickness of the molded article of the present invention is preferably uniform, but the thickness of a predetermined portion of the molded article may be changed depending on the application. The thickness of the molded article can be measured by the method described in the Examples.

[0016] When the molded article of the present invention has a multilayer structure, the thickness of each layer formed from the resin composition containing P3MB is not particularly limited, but from the viewpoint of easily obtaining good insulating properties and chemical resistance, it is preferably 0.01 to 5 mm, more preferably 0.05 to 4 mm, even more preferably 0.1 to 3 mm, and still more preferably 0.2 to 2 mm.

[0017] <Shape of Molded Article> The cross-sectional shape of the molded article of the present invention is not particularly limited and may be substantially circular or may be a non-circular shape such as a polygon, but is preferably substantially circular. Note that "substantially circular" also includes a perfect circle, an ellipse, a distorted circle, and the like. The flatness of the substantially circular cross-sectional shape [100 x (maximum outer diameter - minimum outer diameter) / maximum outer diameter] is preferably 20% or less, more preferably 10% or less, even more preferably 5% or less, even more preferably 3% or less, and may even be 0%. The outer diameter of the molded article of the present invention can be appropriately set depending on the application, but from the viewpoints of moldability, handleability, etc., it is preferably 0.1 to 100 mm, more preferably 0.2 to 50 mm, even more preferably 0.3 to 30 mm, and even more preferably 0.5 to 25 mm. Note that the outer diameter refers to the outer diameter measured by the method described in the Examples.

[0018] Next, the raw materials for the molded body of the present invention will be described in detail.

[0019] <Resin composition containing P3MB> The molded article of the present invention has good insulating properties and chemical resistance due to the inclusion of a resin composition containing P3MB as a raw material. In the following description, the resin composition containing P3MB may be referred to as "resin composition (M1)."

[0020] (3-Methyl-1-butene Polymer) The 3-methyl-1-butene polymer may be a 3-methyl-1-butene homopolymer or a copolymer of 3-methyl-1-butene and an unsaturated hydrocarbon other than 3-methyl-1-butene. Examples of the unsaturated hydrocarbon include ethylene or an α-olefin other than 3-methyl-1-butene. From the viewpoint of good copolymerizability, an α-olefin other than 3-methyl-1-butene is preferred. From the viewpoint of optimally exhibiting the physical properties of 3-methyl-1-butene, P3MB is preferably at least one selected from the group consisting of a 3-methyl-1-butene homopolymer and a copolymer of 3-methyl-1-butene and at least one α-olefin selected from the group consisting of ethylene and an α-olefin other than 3-methyl-1-butene. Hereinafter, in this specification, unless otherwise specified, the term "α-olefin" refers to an α-olefin other than 3-methyl-1-butene.

[0021] When P3MB is a copolymer of 3-methyl-1-butene and at least one selected from the group consisting of ethylene and an α-olefin, from the viewpoint of more easily obtaining good heat resistance, moldability, insulating properties, and chemical resistance, the content of structural units derived from at least one selected from the group consisting of ethylene and an α-olefin in the copolymer is preferably more than 0 mol% and 20 mol% or less, based on 100 mol% of the total amount of structural units derived from the monomers. Furthermore, from the viewpoint of favorably exhibiting the physical properties of the at least one selected from the group consisting of ethylene and an α-olefin, the content of structural units derived from at least one selected from the group consisting of ethylene and an α-olefin in the copolymer is more preferably 0.1 mol% or more, even more preferably 0.3 mol% or more, and still more preferably 0.5 mol% or more, based on 100 mol% of the total amount of structural units derived from the monomers. Furthermore, from the viewpoint of easily maintaining the physical properties of 3-methyl-1-butene and more easily obtaining good heat resistance, moldability, insulating properties, and chemical resistance, the content of structural units derived from at least one selected from the group consisting of ethylene and an α-olefin in the copolymer is more preferably 15 mol% or less, even more preferably 10 mol% or less, and still more preferably 5 mol% or less, based on 100 mol% of the total amount of structural units derived from monomers. Also from the above viewpoints, the content of structural units derived from at least one selected from the group consisting of ethylene and an α-olefin in the copolymer is more preferably 0.1 to 15 mol%, even more preferably 0.3 to 10 mol%, and still more preferably 0.5 to 5 mol%, based on 100 mol% of the total amount of structural units derived from monomers. Here, in this specification, the "total amount of structural units derived from monomers" means, for example, structural units contained due to impurities in the polymerization solvent and monomers when polymerizing a polymer, as well as components necessary for polymerizing a polymer, such as catalysts, polymerization initiators, chain transfer agents, and coupling agents, but does not include structural units derived from components other than monomers.Here, the content of the structural unit derived from at least one selected from the group consisting of ethylene and an α-olefin in the copolymer can be determined by a Fourier transform infrared spectrophotometer (FT-IR), and can be measured, for example, by the method described in the examples described below.

[0022] When P3MB is a copolymer of 3-methyl-1-butene and at least one selected from the group consisting of ethylene and an α-olefin, the content of structural units derived from 3-methyl-1-butene in the copolymer is preferably 80 mol% or more but less than 100 mol%, based on 100 mol% of all structural units derived from monomers, from the viewpoint of more easily achieving good heat resistance, moldability, insulating properties, and chemical resistance. Furthermore, the content of structural units derived from 3-methyl-1-butene in the copolymer is more preferably 85 mol% or more, even more preferably 90 mol% or more, and even more preferably 95 mol% or more, based on 100 mol% of all structural units derived from monomers, from the viewpoint of more easily maintaining the physical properties of 3-methyl-1-butene and more easily achieving good heat resistance, moldability, insulating properties, and chemical resistance. From the viewpoint of favorably exhibiting the properties of at least one selected from the group consisting of ethylene and α-olefins, the content of structural units derived from 3-methyl-1-butene in the copolymer is more preferably 99.9 mol% or less, even more preferably 99.7 mol% or less, and still more preferably 99.5 mol% or less, based on 100 mol% of the total amount of structural units derived from monomers. From the viewpoint above, the content of structural units derived from 3-methyl-1-butene is more preferably 85 to 99.9 mol%, even more preferably 90 to 99.7 mol%, and still more preferably 95 to 99.5 mol%, based on 100 mol% of the total amount of structural units derived from monomers.

[0023] From the viewpoint of suitably exhibiting the physical properties of 3-methyl-1-butene, the α-olefin is preferably an α-olefin having 3 to 20 carbon atoms, more preferably an α-olefin having 4 to 16 carbon atoms, even more preferably an α-olefin having 4 to 12 carbon atoms, and still more preferably an α-olefin having 4 to 10 carbon atoms. The α-olefin may be linear or branched. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, etc. One type of the α-olefin may be used alone, or two or more types may be used in combination.

[0024] From the viewpoint of a balance between heat resistance, moldability, insulating properties, and chemical resistance, the melting point of P3MB is preferably 260 to 310° C., more preferably 265 to 305° C., even more preferably 270 to 300° C., still more preferably 275 to 295° C., and even more preferably 280 to 290° C. The melting point can be measured by the method described in the examples below.

[0025] From the viewpoint of the balance between the fluidity during molding of the resin composition (M1) and the mechanical strength of the resulting molded article, the melt viscosity of P3MB is preferably 10 to 9,500 Pa s, more preferably 20 to 5,000 Pa s, even more preferably 30 to 2,000 Pa s, and still more preferably 50 to 1,000 Pa s. The melt viscosity can be measured by the method described in the examples below.

[0026] The method for producing P3MB is not particularly limited, and it can be produced using well-known catalysts such as Ziegler-Natta catalysts and metallocene catalysts. P3MB can be obtained as a powder by homopolymerizing 3-methyl-1-butene or copolymerizing 3-methyl-1-butene with the above-mentioned α-olefins in the presence of a catalyst, as described in JP-A-61-103910. The stereoregularity of P3MB may be isotactic or syndiotactic. The copolymer may be a random copolymer, a block copolymer, or an alternating copolymer.

[0027] (P3MB Content) From the viewpoint of easily obtaining good insulating properties, chemical resistance, and heat resistance, the content of P3MB in resin composition (M1) is preferably 10 to 100 mass%, more preferably 30 to 100 mass%, even more preferably 40 to 100 mass%, still more preferably 60 to 100 mass%, even more preferably 80 to 100 mass%, and even more preferably 90 to 100 mass%, based on 100 mass% of the total amount of resin components in resin composition (M1). Furthermore, from the viewpoint of easily expressing the characteristics of P3MB and resins other than P3MB in a balanced manner, the content of P3MB in resin composition (M1) may be 10 to 90 mass%, 20 to 80 mass%, 30 to 70 mass%, or 40 to 60 mass%, based on 100 mass% of the total amount of resin components in resin composition (M1). Note that, in the present invention, "resin component" refers to a polymer.

[0028] (Resins Other Than P3MB) The resin composition (M1) may contain a resin other than P3MB. Examples of resins other than P3MB include polyolefin resins other than P3MB (hereinafter, polyolefin resins other than P3MB may also be simply referred to as "polyolefin resins"); styrene resins; acrylic resins; polyamide resins; polyester resins; conjugated diene resins such as polyisoprene and polybutadiene; polyoxymethylene resins; polyurethane resins such as polyurethane elastomers; polyether resins, polyphenylene ether resins, polycarbonate resins, polyvinyl acetate resins, polyvinyl chloride resins, polyimide resins, and polyphenylene sulfide resins. Examples of the resin include polyether ether ketone resins, polyamide imide resins, polyarylate resins, polyvinylidene chloride resins, chlorinated olefin resins, chlorosulfonated olefin resins, polysulfone resins, polyether sulfone resins, polysulfonamide resins, polyvinyl alcohol resins, polyvinyl ester resins, polyisobutyl vinyl ether resins, polymethyl vinyl ether resins, polyphenylene oxide polyacetal resins, ionomers, coumarone-indene resins, cellulose resins, acetate resins, and fluorine-based resins. Among these, polyolefin resins are preferred because of their good miscibility with P3MB.

[0029] Examples of polyolefin resins include polyethylene, polypropylene, polyisobutylene, polybutene, polymethylpentene, polynorbornene, propylene-1-butene copolymer; ethylene-α-olefin copolymers or ethylene-α-olefin-non-conjugated diene copolymers such as propylene-ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, ethylene-propylene copolymer (EPM), ethylene-propylene-non-conjugated diene copolymer (EPDM), ethylene-1-butene copolymer (EBM), and ethylene-1-butene-non-conjugated diene copolymer (EBDM); cyclo Examples of suitable polyolefins include cyclic polyolefins such as copolymers of pentadiene with one or more selected from the group consisting of ethylene and propylene; polar group-containing ethylene-α-olefin copolymers and metal-crosslinked products thereof; ethylene-vinyl acetate copolymers, ethylene-acrylate copolymers, ethylene-methacrylate copolymers, polyolefin-based thermoplastic elastomer block copolymers, and olefin-based thermoplastic elastomers (e.g., simple mixtures of polypropylene with ethylene / propylene copolymers or ethylene-propylene-diene terpolymers, partially crosslinked products thereof, or fully crosslinked products thereof), as well as modified products thereof. Among these, polypropylene-based resins containing propylene are preferred because of their good miscibility with P3MB.

[0030] The polypropylene resin may be a known polypropylene resin. The content of structural units derived from propylene in the polypropylene resin is preferably 65 to 100 mol%, more preferably 80 to 100 mol%, even more preferably 85 to 100 mol%, still more preferably 90 to 100 mol%, and even more preferably 95 to 100 mol%, based on 100 mol% of the total amount of structural units derived from monomers.

[0031] The polypropylene-based resin may contain structural units derived from a monomer other than propylene. Examples of structural units derived from a monomer other than propylene include structural units derived from ethylene, and structural units derived from α-olefins such as 1-butene, 1-hexene, 1-heptene, 1-octene, 4-methyl-1-pentene, 1-nonene, and 1-decene. When the polypropylene-based resin contains structural units derived from a monomer other than propylene, the polypropylene-based resin may be a random copolymer or a block copolymer.

[0032] Examples of polypropylene-based resins include homopolypropylene, propylene-ethylene random copolymers, propylene-ethylene block copolymers, propylene-butene random copolymers, propylene-butene block copolymers, propylene-ethylene-butene random copolymers, propylene-pentene random copolymers, propylene-hexene random copolymers, propylene-octene random copolymers, propylene-ethylene-pentene random copolymers, propylene-ethylene-hexene random copolymers, and modified products thereof. One type of polypropylene-based resin may be used alone, or two or more types may be used in combination.

[0033] The melt flow rate (MFR) of the polypropylene resin measured under conditions of 230°C and 21.6N is preferably 0.05 to 20 g / 10 min, more preferably 0.1 to 5 g / 10 min, even more preferably 0.2 to 3 g / 10 min, and still more preferably 0.3 to 1 g / 10 min, from the viewpoint of more easily obtaining good heat resistance and moldability. The melt flow rate (MFR) of the polypropylene resin measured under conditions of 230°C and 21.6 N can be measured in accordance with JIS K 7210:1999.

[0034] The melting point of the polypropylene resin is preferably 120 to 180° C., more preferably 130 to 176° C., even more preferably 140 to 174° C., and still more preferably 150 to 170° C. The melting point of the polypropylene resin can be measured in accordance with JIS K 7121:2012.

[0035] Examples of styrene resins include styrene homopolymer (PS), high impact polystyrene (HIPS), styrene-butadiene copolymer, styrene-isoprene copolymer, ethylene-styrene copolymer (ESI), acrylonitrile-styrene copolymer (AS), acrylonitrile-butadiene-styrene copolymer (ABS), acrylonitrile-ethylene-propylene rubber-styrene copolymer (AES), acrylonitrile-acrylate-styrene copolymer (AAS), acrylonitrile-chlorinated polyethylene-styrene copolymer (ACS), styrene-methyl methacrylate copolymer (MS), butadiene-styrene-methyl methacrylate copolymer (MBS), styrene-maleic anhydride copolymer (SMA), and the like, and also include hydrogenated or modified products thereof.

[0036] Examples of the acrylic resin include poly(meth)acrylic acid esters such as polymethyl(meth)acrylate, polyethyl(meth)acrylate, polybutyl(meth)acrylate, poly2-ethylhexyl(meth)acrylate, and polycyclohexyl(meth)acrylate, and also include copolymers and modified products thereof.

[0037] Examples of polyamide-based resins include polyamide 4, polyamide 6, polyamide 6.6, polyamide 6.10, polyamide 11, polyamide 12, polyamide 6.12, polyhexamethylenediamine terephthalamide, polyhexamethylenediamine isophthalamide, polynonanediamine terephthalamide, polynonanediamine isophthalamide, polydecanediamine terephthalamide, polydecanediamine isophthalamide, xylene group-containing polyamides, and polyamide elastomers, including copolymers and modified products thereof. The melt flow rate (MFR) of the polyamide-based resin is preferably 0.05 to 30 g / 10 min, more preferably 0.1 to 20 g / 10 min, even more preferably 1 to 15 g / 10 min, and even more preferably 3 to 10 g / 10 min, from the viewpoint of more easily achieving good heat resistance and moldability. The melt flow rate (MFR) of the polyamide-based resin can be measured in accordance with ISO 1133. The conditions for measuring the melt flow rate (MFR) of a polyamide resin vary depending on the melting point of the polyamide resin, but for example, for polyamide 6, the measurement is performed under conditions of 235°C and 2.16 kg. The melting point of the polyamide resin is preferably 120 to 300°C, more preferably 150 to 270°C, even more preferably 180 to 250°C, and still more preferably 200 to 230°C. The melting point of the polyamide resin can be measured in accordance with ISO 11357.

[0038] Examples of polyester resins include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and polyester elastomers, including copolymers and modified products thereof.

[0039] When resin composition (M1) contains a resin other than P3MB, the content of the resin other than P3MB in resin composition (M1) may be 10 to 90% by mass, 20 to 80% by mass, 30 to 70% by mass, or 40 to 60% by mass, relative to 100% by mass of the total amount of resin components in resin composition (M1), from the viewpoint of making it easier to exhibit the characteristics of P3MB and the resin other than P3MB in a well-balanced manner.

[0040] (Alkyl Radical Scavenger) The resin composition (M1) preferably contains an alkyl radical scavenger. The inclusion of an alkyl radical scavenger makes it easier to obtain good heat resistance and moldability, and also makes it easier to obtain a molded article with a small surface roughness Ra. In this specification, "alkyl radical scavenger" refers to a compound that reacts with an alkyl radical derived from P3MB and stabilizes the alkyl radical. By stabilizing the alkyl radical, the function of suppressing a chain reaction of carbon-carbon bond dissociation reactions initiated by the alkyl radical is achieved. The resin composition (M1) preferably contains, as the alkyl radical scavenger, at least one selected from the group consisting of an acrylic phenol compound and a benzofuranone compound. One alkyl radical scavenger may be used alone, or two or more may be used in combination.

[0041] [Acrylphenol Compound] As the acrylic phenol compound, for example, a compound represented by the following general formula (I) can be used.

[0042]

[0043] In general formula (I), R １ represents a hydrogen atom or a methyl group, and R ２ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and R ３ , R ４ , R ５ and R ６ each independently represents an alkyl group having 1 to 9 carbon atoms. Examples of the alkyl group having 1 to 3 carbon atoms include a methyl group, an ethyl group, an n-propyl group, and an isopropyl group. The alkyl group having 1 to 9 carbon atoms may be linear or branched. Examples of the alkyl group having 1 to 9 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, an s-butyl group, a t-butyl group, a 1,1-dimethylpropyl group, a 1,2-dimethylpropyl group, a 2,2-dimethylpropyl group, a 1-methylbutyl group, a 2-methylbutyl group, a 3-methylbutyl group, an n-pentyl group, an n-hexyl group, an n-heptyl group, an n-octyl group, and an n-nonyl group. R １is preferably a hydrogen atom. ２ is preferably a hydrogen atom or a methyl group, more preferably a methyl group. ３ , R ４ , R ５ and R ６ are each independently preferably an alkyl group having 3 to 8 carbon atoms, more preferably an alkyl group having 5 carbon atoms, and even more preferably a 1,1-dimethylpropyl group.

[0044] Examples of the acrylic phenol compound represented by general formula (I) include 2,4-di-t-amyl-6-[1-(3,5-di-t-amyl-2-hydroxyphenyl)ethyl]phenyl acrylate, 2,4-di-t-butyl-6-[1-(3,5-di-t-butyl-2-hydroxyphenyl)ethyl]phenyl acrylate, and 2-t-butyl-6-[(3-t-butyl-2-hydroxy-5-methylphenyl)methyl]-4-methylphenyl acrylate. Commercially available alkyl radical scavengers may be used, and examples of the acrylic phenol compound represented by general formula (I) include those available under the trade names "Sumilizer (registered trademark) GS" and "Sumilizer (registered trademark) GM" manufactured by Sumitomo Chemical Co., Ltd.

[0045] [Benzofuranone Compound] As the benzofuranone compound, for example, a compound represented by the following general formula (II) can be used.

[0046]

[0047] In general formula (II), R ７ and R ８ each independently represents an alkyl group having 1 to 4 carbon atoms; R ９ and R １０each independently represents an alkyl group having 1 to 9 carbon atoms. Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a s-butyl group, and a t-butyl group. The alkyl group having 1 to 9 carbon atoms may be linear or branched. Examples of the alkyl group having 1 to 9 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a s-butyl group, a t-butyl group, a 1,1-dimethylpropyl group, a 1,2-dimethylpropyl group, a 2,2-dimethylpropyl group, a 1-methylbutyl group, a 2-methylbutyl group, a 3-methylbutyl group, an n-pentyl group, an n-hexyl group, an n-heptyl group, an n-octyl group, and an n-nonyl group. R ７ and R ８ are each independently preferably an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group. ９ and R １０ are each independently preferably an alkyl group having 1 to 4 carbon atoms, more preferably a t-butyl group.

[0048] Examples of the benzofuranone compound represented by general formula (II) include 5,7-di-t-butyl-3-(3,4-di-methyl-phenyl)-3H-benzofuran-2-one, 5,7-di(t-butyl)-3-(3,4-di-propyl-phenyl)-3H-benzofuran-2-one, and 4-t-butyl-2-(5-t-butyl-2-oxo-3H-benzofuran-3-yl)phenyl-3,5-di-t-butyl-4-hydroxybenzoate. Commercially available alkyl radical scavengers may be used, and examples of the benzofuranone compound represented by general formula (II) include "Irganox (registered trademark) HP-136" manufactured by BASF and "Revonox 501" manufactured by Chitec.

[0049] From the viewpoint of more easily achieving the effects of the present invention, the content of the alkyl radical scavenger in the resin composition (M1) is preferably 0.01 to 1.00 parts by mass, more preferably 0.02 to 0.80 parts by mass, and even more preferably 0.05 to 0.70 parts by mass, relative to 100 parts by mass of the total amount of the resin components in the resin composition (M1). When the resin composition (M1) contains two or more types of alkyl radical scavengers, the content of the alkyl radical scavengers means the total content of the alkyl radical scavengers.

[0050] (Antioxidant) The resin composition (M1) preferably further contains an antioxidant. By including an antioxidant, it becomes easier to obtain good heat resistance and moldability, and also to obtain a molded article with a small surface roughness Ra. The antioxidant is preferably at least one selected from the group consisting of phenolic antioxidants and phosphorus-based antioxidants. One antioxidant may be used alone, or two or more antioxidants may be used in combination. In this specification, an antioxidant that also acts as an alkyl radical scavenger is considered to be an alkyl radical scavenger.

[0051] [Phenol-Based Antioxidants] Examples of phenol-based antioxidants include pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 1,3,5-tris(3,5-di-t-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 1,3,5-tris[(4-t-butyl-3-hydroxy-2,6-xylyl)methyl]-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, and methyl ... octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, thiodiethylene-bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], N,N'-hexane-1,6-diylbis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionamide], 3,3',3'',5,5',5''-hexa-t-butyl-α,α',α''-(mesitylene-2,4,6-triyl)tri-p-cresol, ethylenediamine bis(oxyethylene)bis[3-(5-t-butyl-4-hydroxy-m-tolyl)propionate], hexamethylene-bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 2,6-di-t-butyl-4-[4,6-bis(octylthio)-1,3,5-triazin-2-ylamino]phenol, 3,9-bis[2-(3-(3-t-butyl-4-hydroxy-5-methylphenyl)propionyloxy)-1,1-dimethylethyl]-2, Examples include 4,8,10-tetraoxaspiro(5,5)undecane, 4,4',4''-(1-methylpropanyl-3-ylidene)tris(6-t-butyl-m-cresol), 6,6'-di-t-butyl-4,4'-butylidene-m-cresol, octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, and benzenepropionic acid 3,5-bis-(1,1-dimethylethyl)-4-hydroxy-C7-C9 branched alkyl ester.

[0052] As the phenolic antioxidant, commercially available products may be used, such as "ADEKA STAB (registered trademark) AO series" manufactured by ADEKA Corporation and "Irganox (registered trademark) series" manufactured by BASF Japan Ltd.

[0053] [Phosphorus-Based Antioxidants] Examples of phosphorus-based antioxidants include 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, tetrakis(2,4-di-t-butyl-phenyl)-4,4'-biphenylene phosphonite, 2,2-methylenebis(4,6-di-t-butylphenyl)octyl phosphite, tris(2,4-di-t-butylphenyl)phosphite, bis(2,4-bis(1,1-dimethylethyl)-6-methylphenyl)ethyl ester phosphite, bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, di-t-butyl-m-cresyl phosphonite, and diethyl[(3,5-bis(1,1- dimethylethyl)-4-hydroxyphenyl)methyl]phosphonate, tetrakis(2,4-di-t-butylphenyl)-4,4'-biphenylene diphosphonite, 3,9-bis(octadecyoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, tris(nonylphenyl)phosphite, tetra-C12-15-alkyl(propane-2,2-diylbis(4,1-phenylene))bis(phosphite), 2-ethylhexyldiphenylphosphite, isodecyldiphenylphosphite, trisisodecylphosphite, triphenylphosphite, and 3,9-bis[2,4-bis(1-methyl-1-phenylethyl)phenoxy]-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane.

[0054] As the phosphorus-based antioxidant, commercially available products may be used, and examples thereof include "ADK STAB (registered trademark) PEP series" and "ADK STAB (registered trademark) HP series" manufactured by ADEKA Corporation, "Irgafos (registered trademark) series" manufactured by BASF Japan Ltd., and "HOSTANOX (registered trademark) P-EPQ" manufactured by Clariant.

[0055] [Other Antioxidants] Examples of other antioxidants besides the phenol-based antioxidants and phosphorus-based antioxidants include sulfur-based antioxidants and amine-based antioxidants.

[0056] From the viewpoint of more easily achieving the effects of the present invention, the content of the antioxidant in the resin composition (M1) is preferably 0.01 parts by mass or more, more preferably 0.10 parts by mass or more, per 100 parts by mass of the total amount of the resin components in the resin composition (M1). Furthermore, from the viewpoint of being able to suppress bleed-out and sublimation of the antioxidant, as well as from the viewpoint of economic efficiency, the content of the antioxidant in the resin composition (M1) is preferably 1.00 parts by mass or less, more preferably 0.80 parts by mass or less, per 100 parts by mass of the total amount of the resin components in the resin composition (M1). From the above viewpoints, the content of the antioxidant in the resin composition (M1) is preferably 0.01 to 1.00 parts by mass, more preferably 0.10 to 0.80 parts by mass, per 100 parts by mass of the total amount of the resin components in the resin composition (M1). When the resin composition (M1) contains two or more antioxidants, the content of the antioxidants refers to the total content of the antioxidants.

[0057] (Other Additives) The resin composition (M1) may contain other additives in addition to the alkyl radical scavenger and the antioxidant, as long as the effects of the present invention are not impaired. Examples of other additives include antacids, fillers, light stabilizers, antistatic agents, flame retardants, pigments, polymerization inhibitors, heavy metal deactivators, UV absorbers, nucleating agents, clarifying agents, lubricants, fluorescent brighteners, rust inhibitors, and sliding agents. One type of other additive may be used alone, or two or more types may be used in combination.

[0058] [Antacid Agent] The resin composition (M1) preferably contains an antacid from the viewpoint of suppressing deterioration due to acid components generated from residual metals and the like during melt-kneading. Examples of antacid agents include barium laurate, calcium stearate, zinc stearate, magnesium stearate, aluminum stearate, zinc oleate, and magnesium 12-hydroxystearate. One type of antacid may be used alone, or two or more types may be used in combination. When the resin composition (M1) contains an antacid, the content of the antacid in the resin composition (M1) can be determined appropriately. For example, the content may be 0.01 to 200 parts by mass, 0.01 to 100 parts by mass, 0.01 to 50 parts by mass, 0.01 to 10 parts by mass, 0.01 to 1.00 parts by mass, or 0.1 to 0.80 parts by mass, relative to 100 parts by mass of the total amount of resin components in the resin composition (M1).

[0059] [Filler] Examples of fillers include fibrous compounds such as glass fiber, alumina fiber, resin fiber, carbon fiber, and cellulose fiber; flat compounds such as mica, talc, montmorillonite, and flat aluminum; spherical compounds such as glass beads, shirasu balloons, and acrylic balloons; acicular compounds such as acicular metal titanate, wollastonite, acicular silica, and tin oxide; and powdered compounds such as powdered metal titanate, finely divided wood chips, titanium oxide, calcium carbonate, silica, and alumina. These fillers may be surface-treated with, for example, a silane coupling agent. A compatibilizer may also be used to enhance the dispersibility of the filler. One filler may be used alone, or two or more fillers may be used in combination. When the resin composition (M1) contains a filler, the content of the filler in the resin composition (M1) can be determined appropriately, and may be, for example, 0.01 to 300 parts by mass or 0.1 to 100 parts by mass relative to 100 parts by mass of the total amount of the resin components in the resin composition (M1).

[0060] (Total Content of Each Component, etc.) From the viewpoint of more easily obtaining good heat resistance, moldability, insulating properties, and chemical resistance, the total content of the resin components in the resin composition (M1) is preferably 50.0 to 100 mass%, more preferably 60.0 to 99.9 mass%, even more preferably 70.0 to 99.8 mass%, still more preferably 80.0 to 99.7 mass%, still more preferably 90.0 to 99.6 mass%, and still more preferably 95.0 to 99.5 mass%, based on 100 mass% of the total amount of the resin composition (M1).

[0061] From the viewpoint of the balance between fluidity during molding and the mechanical strength of the resulting molded article, the melt viscosity of the resin composition (M1) is preferably 10 to 9,500 Pa s, more preferably 15 to 4,000 Pa s, even more preferably 20 to 2,000 Pa s, and still more preferably 30 to 1,000 Pa s. The melt viscosity can be measured by the same method as the method for measuring the melt viscosity of P3MB described in the Examples below.

[0062] (Method for producing resin composition (M1)) The resin composition (M1) can be produced by blending and kneading P3MB and, if necessary, other components. The method for blending the components is not particularly limited as long as the effects of the present invention are achieved, and for example, a method of melt-kneading using a twin-screw kneading extruder can be used. The conditions for obtaining the resin composition (M1) by melt-kneading are described below.

[0063] When the resin composition (M1) is obtained by melt-kneading, the melt-kneading conditions are preferably such that the resin composition (M1) is melt-kneaded in an inert atmosphere or a low-oxygen state. By melt-kneading in an inert atmosphere or a low-oxygen state, the deterioration of the physical properties of the resin composition (M1) due to oxygen can be suppressed, and good heat resistance and moldability can be more easily obtained, and a molded product with a small surface roughness Ra can be more easily obtained. Here, the "low-oxygen state" refers to a state in which the oxygen concentration inside the melt-kneader is lowered compared to before the degassing by depressurizing the inside of the melt-kneader. Furthermore, in the "inert atmosphere" state, an inert gas is injected into the melt-kneader, and the oxygen concentration inside the melt-kneader is lower compared to before the inert gas is injected. Therefore, the concept of "low-oxygen state" may also include a state of "inert atmosphere." In the "low-oxygen state," the oxygen concentration inside the melt-kneader is preferably 5% or less, more preferably 2% or less, and even more preferably 1% or less. The oxygen concentration can be measured using a diaphragm-type galvanic oxygen meter, such as the XP-3180E (diaphragm-type galvanic cell type) manufactured by New Cosmos Electric Co., Ltd.

[0064] The method of melt-kneading by injecting an inert gas into the melt-kneader may, for example, be to introduce each component into the melt-kneader while injecting an inert gas into the melt-kneader and perform melt-kneading; after introducing each component into the melt-kneader, preferably before starting to heat or before starting shearing, more preferably before starting to heat and before starting shearing, and then perform melt-kneading; or, after injecting an inert gas into the melt-kneader, to introduce each component from a sealed supply section and perform melt-kneading. Also, during melt-kneading, the inert gas may be continuously injected into the melt-kneader. The method of injecting the inert gas can be carried out depending on the equipment provided in each melt-kneader, and it is preferable to inject the inert gas into the entire area from the inert gas supply section to the heating section where melt-kneading is performed, and there are no particular restrictions on the injection method. For example, the inert gas may be introduced from a supply section for a gas such as an inert gas provided in the melt kneader, from a supply section for each component provided in the melt kneader, or from a gas vent provided in the melt kneader. Examples of the inert gas include nitrogen gas, helium gas, neon gas, argon gas, krypton gas, and carbon dioxide gas, and nitrogen gas is preferred from the viewpoints of availability and versatility.

[0065] The method of melt-kneading while degassing the inside of the melt-kneader under reduced pressure may involve, for example, introducing each component into the melt-kneader while degassing the inside of the melt-kneader, and then melt-kneading. Alternatively, after introducing each component into the melt-kneader, degassing the inside of the melt-kneader under reduced pressure, preferably before starting the temperature increase or before starting shearing, more preferably before starting the temperature increase and before starting shearing, and then melt-kneading. Alternatively, after degassing the inside of the melt-kneader under reduced pressure, each component may be introduced from a sealed supply port and then melt-kneaded. Furthermore, degassing the inside of the melt-kneader under reduced pressure may be performed intermittently or continuously during melt-kneading. The method of degassing the inside of the melt-kneader under reduced pressure may be performed depending on the equipment provided in each melt-kneader, and may be performed, for example, through a vacuum vent. For example, a vacuum pump may be used for degassing the inside of the melt-kneader. There are no limitations on the method of degassing the inside of the melt-kneader under reduced pressure, as long as it is possible to perform melt-kneading under an inert atmosphere or in a low-oxygen environment. When degassing under reduced pressure, the inside of the melt kneader can be reduced to a reduced pressure of, for example, 0.1 to 50 kPa.

[0066] The melt kneader may be a single-screw extruder, a multi-screw extruder, a kneader, a Banbury mixer, or the like, which is equipped with equipment capable of melt-kneading by injecting an inert gas into the interior of the melt kneader, or equipment capable of melt-kneading by degassing the interior of the melt kneader under reduced pressure.

[0067] The injection of the inert gas and the degassing under reduced pressure may be used in combination. In this case, it is preferable to inject the inert gas upstream of the melt kneader before or together with the raw materials, and on the other hand, to carry out degassing under reduced pressure further downstream. It is also more preferable to inject the inert gas upstream of the melt kneader before or together with the raw materials, and on the other hand, to carry out degassing under reduced pressure further downstream, and to continue both the injection of the inert gas and the degassing under reduced pressure during melt kneading.

[0068] The temperature during melt-kneading is preferably 280 to 325°C. A melt-kneading temperature of 280°C or higher allows P3MB to be sufficiently melted, making it easier to disperse the aforementioned additives and the like in the resin components. From this perspective, the melt-kneading temperature is more preferably 285°C or higher, even more preferably 290°C or higher, and even more preferably 292°C or higher. Furthermore, a melt-kneading temperature of 325°C or lower can suppress decomposition of the components, making it easier to obtain good heat resistance and moldability, and to obtain a molded product with a small surface roughness Ra. From this perspective, the melt-kneading temperature is more preferably 315°C or lower, even more preferably 305°C or lower, even more preferably 300°C or lower, and even more preferably 298°C or lower. From the above perspective, the melt-kneading temperature is more preferably 285 to 315°C, even more preferably 290 to 305°C, even more preferably 290 to 300°C, and even more preferably 292 to 298°C.

[0069] <P3MB-free resin composition> When the molded article of the present invention has a multilayer structure, the molded article of the present invention may contain a P3MB-free resin composition as a raw material. In the following description, the P3MB-free resin composition may be referred to as "resin composition (M2)".

[0070] Examples of the resin contained in the resin composition (M2) include polyolefin resins; styrene resins; acrylic resins; polyamide resins; polyester resins; conjugated diene resins such as polyisoprene and polybutadiene; polyoxymethylene resins; polyurethane resins such as polyurethane elastomers; polyether resins, polyphenylene ether resins, polycarbonate resins, polyvinyl acetate resins, polyvinyl chloride resins, polyimide resins, polyphenylene sulfide resins, polyether ether ketone resins, and poly Examples of suitable resins include triamideimide resins, polyarylate resins, polyvinylidene chloride resins, chlorinated olefin resins, chlorosulfonated olefin resins, polysulfone resins, polyethersulfone resins, polysulfonamide resins, polyvinyl alcohol resins, polyvinyl ester resins, polyisobutyl vinyl ether resins, polymethyl vinyl ether resins, polyphenylene oxide polyacetal resins, ionomers, coumarone-indene resins, cellulose resins, acetate resins, and fluorine-based resins. Specific examples of polyolefin resins, styrene resins, acrylic resins, polyamide resins, and polyamide resins include those described above in the "(Resins Other Than P3MB)" section. Among these, polypropylene resins and polyamide resins are preferred, with polypropylene resins being more preferred, from the viewpoint of easily achieving good adhesion with layers formed from resin compositions containing P3MB. The preferred embodiments of polypropylene resins are the same as those described above in the "(Resins Other Than P3MB)" section.

[0071] From the viewpoint of easily obtaining good moldability, the content of the polypropylene resin in the resin composition (M2) is preferably 10 to 100 mass%, more preferably 20 to 100 mass%, even more preferably 40 to 100 mass%, still more preferably 60 to 100 mass%, even more preferably 70 to 100 mass%, still more preferably 80 to 100 mass%, still more preferably 90 to 100 mass%, and may even be 100 mass%, based on 100 mass% of the total amount of the resin components in the resin composition (M2).

[0072] Resin composition (M2) may or may not contain the alkyl radical scavenger, antioxidant, other additives, etc. that may be contained in resin composition (M1). When resin composition (M2) contains an alkyl radical scavenger, antioxidant, or other additives, the contents of these components are the same as those of resin composition (M1).

[0073] From the viewpoint of making it easier to obtain good heat resistance and moldability, the total content of the resin components in the resin composition (M2) is preferably 50.0 to 100 mass%, more preferably 60.0 to 99.9 mass%, even more preferably 70.0 to 99.8 mass%, still more preferably 80.0 to 99.7 mass%, still more preferably 90.0 to 99.6 mass%, and still more preferably 95.0 to 99.5 mass%, based on 100 mass% of the total amount of the resin composition (M2).

[0074] The method for producing resin composition (M2) is described in the above section "(Method for producing resin composition (M1))" by replacing "resin composition (M1)" with "resin composition (M2)." However, the method for producing resin composition (M2) is not limited to the method described in the above section "(Method for producing resin composition (M1))," and any known production method suitable for the resin contained in resin composition (M2) may be adopted.

[0075] <Weight Change Rate of Molded Article After Chloroform Immersion Test> The weight change rate of the molded article of the present invention after immersion in chloroform at 23°C for one week, measured according to JIS K 7114:2001, is preferably less than 70%, more preferably 50% or less, and even more preferably 30% or less, from the viewpoint of chemical resistance. The smaller the weight change rate, the better, and there is no lower limit, but it is preferably, for example, 0%. A more detailed method for measuring the weight change rate is as described in the Examples.

[0076] <Dielectric breakdown strength of molded article> The dielectric breakdown strength of the molded article of the present invention is preferably 28 kV / mm or more, more preferably 30 kV / mm or more, even more preferably 33 kV / mm or more, and even more preferably 36 kV / mm or more. The higher the dielectric breakdown strength of the molded article of the present invention, the better, and there is no upper limit, but it may be, for example, 1,000 kV / mm or less, or 100 kV / mm or less. The dielectric breakdown strength of the molded article of the present invention can be measured in accordance with JIS C 2133:1999 "21. Dielectric breakdown voltage". More specific measurement methods are as described in the Examples.

[0077] <Storage Modulus E' of Molded Article> From the viewpoint of heat resistance, the molded article of the present invention preferably has a storage modulus E' of 50 MPa or more at 150° C. and a storage modulus E' of 1 MPa or more at 270° C. The storage modulus E' of the molded article of the present invention at each temperature can be measured by the method described in the examples.

[0078] From the viewpoint of improving heat resistance, the storage modulus E' of the molded article of the present invention at 150°C is preferably 50 MPa or more, more preferably 70 MPa or more, even more preferably 90 MPa or more, and still more preferably 120 MPa or more. From the viewpoint of preventing breakage of the molded article during thermoforming, the storage modulus E' of the molded article of the present invention at 150°C is preferably 500 MPa or less, and may be, for example, 400 MPa or less, or 300 MPa or less.

[0079] From the viewpoint of improving heat resistance, the storage modulus E' of the molded article of the present invention at 270°C is preferably 1 MPa or more, more preferably 5 MPa or more, even more preferably 15 MPa or more, and still more preferably 20 MPa or more. The storage modulus E' of the molded article of the present invention at 270°C is preferably 100 MPa or less, and may be, for example, 80 MPa or less, or may be 50 MPa or less.

[0080] The storage modulus E' of the molded article of the present invention at 70°C is preferably 1,000 MPa or less, more preferably 700 MPa or less, even more preferably 500 MPa or less, and still more preferably 400 MPa or less, from the viewpoint of improving the flexibility of the molded article. Furthermore, from the viewpoint of improving the heat resistance and improving the storage stability even in a higher temperature environment, the storage modulus E' of the molded article of the present invention at 70°C is preferably 100 MPa or more, more preferably 200 MPa or more, even more preferably 250 MPa or more, and still more preferably 350 MPa or more.

[0081] <Uses of Molded Article> The molded article of the present invention has good insulating properties and chemical resistance and can be used in a variety of applications, and is suitable for, for example, chemical production applications, electrical and electronic equipment applications, medical applications, transportation equipment applications such as automobiles, machine tool applications, building applications, etc. Examples of suitable tubes include liquid transfer tubes, gas supply tubes, protective tubes, etc. Specific examples include medical tubes such as infusion tubes, blood transfusion tubes, and catheters; tubes for heat transfer media such as refrigerants and heat transfer media; fuel tubes such as evaporation hoses, breather hoses, fuel hoses, and ORVR tubes; hydraulic tubes; pneumatic tubes; supply tubes for ink, paint, etc.; tubes for food or beverages; tubes for transporting industrial waste liquids; tubes for semiconductor production; protective tubes for electronic components, electronic devices, conductors, etc.

[0082] The coating material is suitable for applications requiring electrical insulation, such as insulating coatings. Examples of such coating materials include: coating materials for coating the outer periphery of conductors and the like; coating materials for electrical components such as battery containers; coating materials for assembly parts such as screws, bolts, nuts, and washers; coating materials for work tools such as screwdrivers, pliers, wrenches, hammers, and cutters; coating materials for shoes, clothing, gloves, helmets, and the like; and coating materials for electronic circuit boards, capacitors, and the like. Among these, as described above, the coating material is preferably a coating material for coating the outer periphery of a linear object such as a conductor. The linear object may be, for example, a conductor, or a conductor coated with a material other than the coating material of the present invention. Examples of coating materials using the molded product of the present invention as a coating material for a linear object include coated electric wires and coated cables. The conductor may be a single wire or a bundle of multiple single wires. The bundled conductor may be a bundle of multiple single wires twisted together, or a bundle of multiple single wires drawn together without being twisted together. Examples of the conductor material include known conductor materials such as copper, copper alloy, gold, silver, and aluminum, and the conductor diameter is, for example, 0.01 to 10 mm.

[0083] [Method for Producing Molded Article] The method for producing a molded article of the present invention is a method for producing a molded article, which includes a step (I) of melt-extruding the resin composition (M1).

[0084] <Step (I)> Step (I) is a step of melt-extruding the resin composition (M1). As a method for melt-extruding the resin composition (M1), it is preferable to use an extruder, from the viewpoint of ease of production and easy production of a molded product with excellent dimensional accuracy. As the extruder, for example, a single-screw extruder or a multi-screw extruder such as a twin-screw kneading extruder can be used.

[0085] In step (I), the resin composition (M1) is preferably melted under an inert atmosphere or a low-oxygen state, more preferably under an inert atmosphere. By melting the resin composition (M1) under an inert atmosphere or a low-oxygen state, the deterioration of the physical properties of the resin composition (M1) due to oxygen can be suppressed, and it is easier to obtain good heat resistance and moldability, and it is easier to obtain a molded product with a small surface roughness Ra. For example, when an extruder is used in step (I), it is preferable to melt the resin composition (M1) using at least one method selected from injecting an inert gas into the extruder to melt the resin composition (M1), and degassing the inside of a melt-kneader under reduced pressure to melt the resin composition (M1).

[0086] Examples of a method for melting the resin composition (M1) by injecting an inert gas into the extruder include: injecting an inert gas into the extruder; introducing the resin composition (M1) prepared in advance by the method described above in the "Method for Producing Resin Composition (M1)" section into a raw material inlet such as a hopper, and melting the resin composition (M1) in the extruder; or, after introducing the resin composition (M1) into the extruder from a raw material inlet such as a hopper, preferably before starting the temperature increase or before starting shearing, more preferably before starting the temperature increase and before starting shearing, and then melting the resin composition (M1) in the extruder; and the like. Also, it is preferable to continue injecting the inert gas into the extruder while the resin composition (M1) is melting. The inert gas injection method can be performed depending on the equipment installed in the extruder used. It is preferable to inject the inert gas into the entire extruder from the inert gas supply section to the heating section where the melt-kneading is performed, and the melt-kneading can be performed by injecting the inert gas into the entire extruder from the inert gas supply section to the heating section where the melt-kneading is performed, and there are no particular restrictions on the injection method. For example, the inert gas may be supplied from a gas supply section such as an inert gas provided in the extruder, or from a supply section for each component such as a hopper provided in the extruder. Examples of the inert gas include nitrogen gas, helium gas, neon gas, argon gas, krypton gas, and carbon dioxide gas, and nitrogen gas is preferred from the viewpoints of availability and versatility.

[0087] Examples of a method for melting the resin composition (M1) by degassing the inside of the extruder under reduced pressure include a method in which the resin composition (M1) prepared in advance by the method described above in the "Method for Producing Resin Composition (M1)" section is introduced into the extruder through a raw material inlet such as a hopper and melted; or a method in which the resin composition (M1) is introduced into the extruder through a raw material inlet such as a hopper, and then the inside of the extruder is degassed under reduced pressure and melted, preferably before starting the temperature increase or before starting shearing, more preferably before starting the temperature increase and before starting shearing; etc. Also, while the resin composition (M1) is melting, the degassing under reduced pressure inside the extruder may be carried out intermittently or continuously, and it is preferable to carry out the degassing under reduced pressure continuously while the resin composition (M1) is melting. There are no limitations on the degassing method for the degassing inside the extruder, as long as the resin composition (M1) can be melt-kneaded under an inert atmosphere or in a low-oxygen state. For example, in one embodiment of the production method, degassing under reduced pressure inside the extruder can be performed depending on the equipment provided in the extruder used, and may be performed, for example, through a vacuum vent. For degassing under reduced pressure, a decompression pump such as a vacuum pump can be used. Furthermore, by performing degassing under reduced pressure inside the extruder, it is possible to remove moisture remaining in the resin composition (M1) and organic solvents that evaporate at the melting temperature, etc., and this is preferable because it can suppress foaming of the melt caused by moisture, etc., when the melt is extruded from a die, etc. From this perspective, the degassing under reduced pressure is preferably performed after the resin composition (M1) is melted and before it is extruded, and may be performed, for example, through a vent provided in the barrel corresponding to the shear section position of the extruder.

[0088] The injection of the inert gas and the degassing under reduced pressure may be used in combination. In this case, it is preferable to inject the inert gas upstream of the extruder before or together with the raw materials, and to carry out the degassing under reduced pressure downstream of the inert gas injection. It is more preferable to continue both the injection of the inert gas and the degassing under reduced pressure during the melt-kneading.

[0089] As described above, the resin composition (M1) used in the step (I) may be a resin composition (M1) prepared in advance by the method described above in the section "Method for producing resin composition (M1)" or a method may be used in which the components described above are kneaded in an extruder used in the step (I) to prepare the resin composition (M1), and the molten resin composition (M1) is directly extruded from the extruder.

[0090] In step (I), it is preferable to melt the resin composition (M1) at 280 to 325°C. When the temperature during melt-kneading in step (I) is 280°C or higher, the resin composition (M1) can be sufficiently melted, and good moldability can be obtained. From this perspective, the temperature during melt-kneading in step (I) is more preferably 285°C or higher, even more preferably 290°C or higher, and even more preferably 292°C or higher. Furthermore, when the temperature during melt-kneading is 325°C or lower, thermal decomposition of each component can be suppressed. Furthermore, good heat resistance and moldability can be more easily obtained, and a molded product with a small surface roughness Ra can be more easily obtained. From these perspectives, the temperature during melt-kneading in step (I) is more preferably 315°C or lower, even more preferably 305°C or lower, even more preferably 300°C or lower, and even more preferably 298°C or lower. From the above viewpoints, the temperature during melt-kneading in step (I) is more preferably 285 to 315°C, even more preferably 290 to 305°C, still more preferably 290 to 300°C, and still more preferably 292 to 298°C.

[0091] In step (I), after melting the resin composition (M1), the resin composition (M1) is extruded, for example, through a die attached to the tip of an extruder and then cooled. The die may be, for example, a tube-forming die or a coating die, depending on the shape of the desired molded product. When producing a coating material for coating the outer periphery of a linear object such as a conductor, it is preferable to extrude a molten extrudate onto the outer surface of a continuously fed linear object to be coated. The size of the extruded molten extrudate, such as the outer diameter and wall thickness, can be controlled, for example, using a vacuum sizing device. The take-up speed of the molten extrudate is not particularly limited, but is, for example, 1 to 50 m / min. The cooling method of the molten extrudate is not particularly limited, but may include, for example, blowing gas onto the molten extrudate to cool and solidify it, or passing the molten extrudate through cooling water.

[0092] In the step (I), the draw-down ratio [D / E], which is the ratio of the lip gap thickness (D) of the die through which the molten resin composition is melt-extruded to the wall thickness (E) of the molded article extruded from the die, is preferably 1 to 10, more preferably 1.3 to 8, even more preferably 1.7 to 7, and still more preferably 2 to 6, from the viewpoint of adjusting the surface roughness Ra to a small value.

[0093] When the molded article of the present invention has a multilayer structure, the layers may be formed simultaneously by co-extruding the resin compositions for forming the layers, or may be formed by sequentially laminating the layers. When a molded article having a multilayer structure is produced by co-extrusion, the method and conditions for melt-extruding the resin compositions for forming the layers are the same as those described in the above section "<Step (I)>". However, the method for melt-extruding each resin composition is not limited to the method described in the above section "<Step (I)>". For example, when a resin composition not containing P3MB is used, known melt-extrusion conditions suitable for the resin contained in the resin composition may be used.

[0094] The present embodiment will be described in more detail below with reference to examples, but the present embodiment is not limited to these examples.

[0095] The physical properties of the P3MB obtained in Production Example 1 were measured or evaluated by the following methods.

[0096] [Content of structural units derived from comonomer (1-decene)] The content of structural units derived from 1-decene in P3MB obtained in Production Example 1 was determined by IR measurement using an FT-IR analyzer ("Cary 600 series FTIR spectrometer" manufactured by Agilent Technologies) by the ATR method, as follows: 3-methyl-1-butene homopolymer and 1-decene homopolymer were mixed in any ratio, and the bending vibration of 1,461 cm derived from the main chain methylene group of each polymer was measured. －１ and a bending vibration of 727 cm due to the side chain methylene group derived from 1-decene. －１ A calibration curve was created from the ratio of the peak area of ​​P3MB obtained in Production Example 1 to the peak area of ​​P3MB obtained in Production Example 1, and the resulting measured values ​​were inserted into the calibration curve to determine the content of structural units derived from 1-decene.

[0097] [Melting Point] Using a differential scanning calorimeter ("DSC25" manufactured by TA Instruments) the P3MB obtained in Production Example 1 was heated from 30°C to 320°C at a rate of 10°C / min under a nitrogen atmosphere (nitrogen flow rate 100 mL / min), held at 320°C for 5 minutes, and then cooled to -70°C at a rate of 10°C / min. After holding at -70°C for 5 minutes, the peak temperature was measured when the temperature was raised to 320°C at 10°C / min, and this temperature was defined as the melting point of P3MB.

[0098] [Melt Viscosity] The melt viscosity (Pa·s) of P3MB obtained in Production Example 1 was measured using a capillary rheometer ("Capilograph (registered trademark) 1C" manufactured by Toyo Seiki Seisaku-sho, Ltd.) at a barrel temperature of 320°C and a shear rate of 1000 sec. －１ The measurement was carried out under the following conditions: (capillary: inner diameter 1.0 mm x length 10 mm, extrusion speed 100 mm / min).

[0099] [Catalyst Preparation] The catalyst component used in Production Example 1 was prepared by the following method. (Preparation of Titanium Catalyst Component) 47.6 g (500 mmol) of anhydrous magnesium chloride, 250 ml of decane, and 234 ml (1.5 mol) of 2-ethylhexyl alcohol were heated and reacted at 130°C for 2 hours to obtain a homogeneous solution. The resulting homogeneous solution was cooled to room temperature (23°C) and then added dropwise over 1 hour to 2 L (18 mol) of titanium tetrachloride maintained at -20°C to obtain a mixed solution. After completion of the dropwise addition of the homogeneous solution, the temperature of the resulting mixed solution was raised to 90°C over 2 hours. When the temperature reached 90°C, 11.4 mL (80 mmol) of ethyl benzoate was added and the mixture was maintained at the same temperature for 2 hours with stirring. After completion of the 2-hour reaction, the mixture was allowed to stand and the supernatant was removed. Decane and hexane were added, and the solids were washed three times. After that, the solids were resuspended in 2 L of titanium tetrachloride and again subjected to a heating reaction at 90°C for 2 hours. After the reaction was complete, the mixture was again left to stand using decane and hexane, and the supernatant was repeatedly removed, followed by thorough washing until no free titanium compound was detected in the washings. The resulting suspension was dried under reduced pressure at room temperature for 6 hours to obtain a titanium catalyst component. The composition of the resulting titanium catalyst component was 4.0% by mass of titanium, 56.0% by mass of chlorine, 17.0% by mass of magnesium, 10.4% by mass of ethyl benzoate, and 12.6% by mass of a hydrocarbon solvent consisting of decane and hexane.

[0100] [Production Example 1] (Production of P3MB) 8.0 kg of 3-methyl-1-butene, 0.6 kg of 1-decene, 50 g of triethylaluminum diluted with hexane to a concentration of 1 mol / L, and 4 g of the titanium catalyst component prepared in the above [Catalyst Preparation] were added to a 20 L stainless steel autoclave, and a polymerization reaction was carried out at 70°C for 4 hours. Hydrogen was continuously supplied at a rate of 40 mL / min during the polymerization reaction. After 4 hours, 200 g of 3-methyl-1-butanol was injected to stop the reaction and expel excess unreacted monomer. Next, 2 kg of normal heptane was introduced, and the mixture was stirred at 60°C for 30 minutes. The solids were then filtered off using a pressure filter. This procedure was repeated twice, and then the solvent was changed from 2 kg of normal heptane to 3 kg of 2-propanol, and the same procedure was repeated twice. 7.7 kg of the resulting crude polymer was placed in a 50 L vessel equipped with a stirrer, followed by the addition of 8 kg of 1 mol / L hydrochloric acid and 16 kg of 2-propanol, followed by stirring for 1 hour. This suspension was filtered by vacuum filtration and washed with 10 kg of 2-propanol. The crude polymer obtained from this first wash was placed in a 50 L vessel equipped with a stirrer, followed by the addition of 20 kg of 2-propanol, followed by stirring for 1 hour. This suspension was filtered by vacuum filtration and washed with 10 kg of 2-propanol. The resulting washed polymer was dried under reduced pressure at 80°C for 2 days, yielding 3.2 kg of P3MB, a copolymer of 3-methyl-1-butene and 1-decene. The resulting P3MB was subjected to the aforementioned measurements, and found to have a melting point of 286°C and a melt viscosity of 145 Pa·s. Furthermore, the content of structural units derived from the comonomer 1-decene in P3MB was 1.1 mol%.

[0101] Example 1 (1) Preparation of Resin Composition A resin composition containing 100 parts by mass of P3MB (obtained in Production Example 1), 0.2 parts by mass of pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (antioxidant "ADK STAB (registered trademark) AO-60" manufactured by ADEKA Corporation), 0.2 parts by mass of 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane (antioxidant "ADK STAB (registered trademark) PEP-36" manufactured by ADEKA Corporation), 2,4-di-t-amyl-6-[1-(3,5-di-t-amyl-2-hydroxyphenyl)ethyl]phenyl acrylate (alkyl acrylate), After dry-blending 0.1 parts by mass of a radical scavenger "Sumilizer (registered trademark) GS" (manufactured by Sumitomo Chemical Co., Ltd.) and 0.25 parts by mass of zinc stearate (antacid), nitrogen purging was performed using 99.99% pure nitrogen from the raw material inlet to prevent external oxygen contamination. While eliminating oxygen as much as possible, the dry-blended materials were added through the raw material inlet and melted at a cylinder temperature of 295°C using a vented twin-screw kneading extruder "KZW15-45" (manufactured by Technovel Co., Ltd.). After removing moisture by vacuuming the shear section of the extruder using a vacuum pump, a pellet-shaped resin composition (M1-1) was obtained as resin composition (M1). The melt viscosity of the resulting resin composition (M1-1) was 142 Pa s.

[0102] (2) Production of Molded Articles The obtained pellet-like resin composition (M1-1) was molded under the following conditions to obtain a tubular molded article. Specifically, as a measure to prevent oxygen contamination from the outside, nitrogen purging was performed using nitrogen of 99.99% purity from the raw material inlet, and while eliminating oxygen as much as possible, the pellet-like resin composition (M1-1) was charged from the raw material inlet, and after being melted at a cylinder temperature of 295 ° C. using a single-screw extruder ("PMS50", screw diameter φ50 mm) manufactured by IKG Corporation, it was melt-extruded into a tubular shape through a tube-forming die (die inner diameter 17 mm, mandrel outer diameter 12 mm), and subsequently cooled in a vacuum sizing tank that controls the dimensions, and a tubular molded article was obtained at a take-up speed of 10 m / min. The draw-down ratio (D / E), which is the ratio of the die lip gap (D) to the wall thickness (E) of the tubular molded article, was set to 2.5.

[0103] [Example 2] A tubular molded article was obtained in the same manner as in Example 1, except that the tube forming die (die inner diameter 17 mm, mandrel outer diameter 12 mm) in Example 1 was changed to a tube forming die (die inner diameter 16 mm, mandrel outer diameter 14 mm) and the take-up speed was changed to 20 m / min.

[0104] Example 3 A tubular molded article was obtained in the same manner as in Example 1, except that in Example 1, the single-screw extruder manufactured by IKG Corporation ("PMS50", screw diameter φ50 mm) was changed to a single-screw extruder manufactured by IKG Corporation ("PMS25", screw diameter φ25 mm), the tube forming die (die inner diameter 17 mm, mandrel outer diameter 12 mm) was changed to a tube forming die (die inner diameter 20 mm, mandrel outer diameter 19.8 mm), and the take-up speed was changed to 20 m / min.

[0105] Example 4 A tubular molded article was obtained in the same manner as in Example 1, except that the molding conditions were changed as shown in Table 1.

[0106] [Example 5] (1) Preparation of Resin Composition A pellet-shaped resin composition (M1-1) was obtained in the same manner as in Example 1. In addition, in "(1) Preparation of Resin Composition" of Example 1, "P3MB (obtained in Production Example 1)" was replaced with "polypropylene (trade name "Prime Polypro (registered trademark) PP E701G", MFR = 0.5 g / 10 min at 230 ° C. measured in accordance with JIS K 7210: 1999, manufactured by Prime Polymer Co., Ltd.)" and the cylinder temperature was changed to 240 ° C. In the same manner as in "(1) Preparation of Resin Composition" of Example 1, a pellet-shaped resin composition (M2-1) was obtained as the resin composition (M2).

[0107] (2) Production of Molded Article The obtained pellet-shaped resin composition (M1-1) and pellet-shaped resin composition (M2-1) were co-extruded under the following conditions to obtain a tubular molded article having the following two-type three-layer structure. <Layer structure> Layer structure of tubular molded article: three-layer structure of inner layer / middle layer / outer layer Inner layer: layer formed from resin composition (M1-1) (thickness: 250 μm) Middle layer: layer formed from resin composition (M2-1) (thickness: 500 μm) Outer layer: layer formed from resin composition (M1-1) (thickness: 250 μm) <Co-extrusion conditions> A single-screw extruder ("PMS50", screw diameter φ50 mm) manufactured by IKG Corporation was used as the extruder for forming each layer. In each extruder, nitrogen purging was performed using 99.99% pure nitrogen from the raw material inlet as a measure to prevent oxygen contamination from the outside, and while eliminating oxygen as much as possible, the pellet-shaped resin composition (M1-1) and resin composition (M2-1) were charged from the raw material inlet, and the resin composition (M1-1) was melted at a cylinder temperature of 295 ° C., and the resin composition (M2-1) was melted at a cylinder temperature of 240 ° C., and then the inner layer / middle layer / outer layer three layers were co-extruded into a tubular shape from a two-kind, three-layer tube forming die, and subsequently cooled in a vacuum sizing tank that controls the dimensions, and a tubular molded product was obtained at a take-up speed of 10 m / min. The draw-down ratio (D / E) is as shown in Table 1.

[0108] [Example 6] (1) Preparation of Resin Composition A pellet-shaped resin composition (M1-1) was obtained in the same manner as in Example 1. A pellet-shaped resin composition (M2-1) was obtained in the same manner as in Example 5. Polyamide 6 (trade name "UBE NYLON 1024JI", manufactured by UBE Corporation) was used as the resin composition (M2-2).

[0109] (2) Production of Molded Articles The obtained pellet-shaped resin composition (M1-1), pellet-shaped resin composition (M2-1), and pellet-shaped resin composition (M2-2) were co-extruded under the following conditions to obtain a tubular molded article having the following three-type four-layer structure. <Layer structure> Layer structure of tubular molded article: four-layer structure of inner layer / middle layer 1 / middle layer 2 / outer layer Inner layer: layer formed from resin composition (M1-1) (thickness: 250 μm) Middle layer 1: layer formed from resin composition (M2-1) (thickness: 250 μm) Middle layer 2: layer formed from resin composition (M2-2) (thickness: 250 μm) Outer layer: layer formed from resin composition (M1-1) (thickness: 250 μm) <Co-extrusion conditions> A single-screw extruder ("PMS50", screw diameter φ50 mm) manufactured by IKG Corporation was used as the extruder for forming each layer. In each extruder, nitrogen purging was performed using 99.99% pure nitrogen from the raw material inlet as a measure to prevent oxygen from being mixed in from the outside, and while eliminating oxygen as much as possible, the above-mentioned pellet-shaped resin compositions (M1-1), (M2-1) and (M2-2) were fed from the raw material inlet, and the resin composition (M1-1) was melted at a cylinder temperature of 295°C, the resin composition (M2-1) at a cylinder temperature of 240°C, and the resin composition (M2-2) at a cylinder temperature of 250°C.Then, from a three-kind, four-layer tube forming die, the four layers of the inner layer / middle layer 1 / middle layer 2 / outer layer were co-extruded into a tubular shape, and subsequently cooled in a vacuum sizing tank that controls the dimensions, and a tubular molded product was obtained at a take-up speed of 10 m / min.

[0110] [Example 7] (1) Preparation of Resin Composition A pellet-shaped resin composition (M1-1) was obtained in the same manner as in Example 1. Furthermore, a pellet-shaped resin composition (M2-1) was obtained in the same manner as in Example 5.

[0111] (2) Production of Molded Article The obtained pellet-shaped resin composition (M1-1) and pellet-shaped resin composition (M2-1) were co-extruded under the following conditions to obtain a tubular molded article having the following two-kind five-layer structure. <Layer structure> Layer structure of tubular molded article: 5-layer structure of inner layer / middle layer 1 / middle layer 2 / middle layer 3 / outer layer Inner layer: Layer formed from resin composition (M1-1) (thickness: 200 μm) Middle layer 1: Layer formed from resin composition (M2-1) (thickness: 200 μm) Middle layer 2: Layer formed from resin composition (M1-1) (thickness: 200 μm) Middle layer 3: Layer formed from resin composition (M2-1) (thickness: 200 μm) Outer layer: Layer formed from resin composition (M1-1) (thickness: 200 μm) <Co-extrusion conditions> A single-screw extruder ("PMS50", screw diameter φ50 mm) manufactured by IKG Corporation was used as the extruder for forming each layer. In each extruder, nitrogen purging was performed using 99.99% pure nitrogen from the raw material inlet as a measure to prevent oxygen from being mixed in from the outside, and while eliminating oxygen as much as possible, the above-mentioned pellet-shaped resin composition (M1-1) and resin composition (M2-1) were fed from the raw material inlet, and resin composition (M1-1) was melted at a cylinder temperature of 295°C, and resin composition (M2-1) was melted at a cylinder temperature of 240°C.Then, from a two-kind, five-layer tube forming die, the above five layers of inner layer / middle layer 1 / middle layer 2 / middle layer 3 / outer layer were co-extruded into a tubular shape, and subsequently cooled in a vacuum sizing tank that controls the dimensions, and a tubular molded product was obtained at a take-up speed of 10 m / min.

[0112] [Example 8] (1) Preparation of resin composition 50 parts by mass of P3MB (obtained in Production Example 1), polypropylene (product name "Prime Polypro (registered trademark) PP E701G", JIS K 7210:1999) = 0.5 g / 10 min at 230 ° C., measured in accordance with Prime Polymer Co., Ltd. (50 parts by mass), pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (antioxidant "ADK STAB (registered trademark) AO-60" manufactured by ADEKA Corporation) 0.2 parts by mass, 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane (antioxidant "ADK STAB (registered trademark) PEP-36" manufactured by ADEKA Corporation) 0.2 parts by mass, 2,4-di-t-amyl-6-[1-(3,5-di-t-amyl-2-hydroxyphenyl)propionate] (antioxidant "ADK STAB (registered trademark) PEP-36" manufactured by ADEKA Corporation) After dry-blending 0.1 parts by weight of [(2-phenyl)ethyl]phenyl acrylate (alkyl radical scavenger "Sumilizer (registered trademark) GS", manufactured by Sumitomo Chemical Co., Ltd.), and 0.25 parts by weight of zinc stearate (antacid), a nitrogen purge was performed using 99.99% pure nitrogen from the raw material inlet to prevent external oxygen contamination. While eliminating oxygen as much as possible, the dry-blended materials were charged into the raw material inlet and melted at a cylinder temperature of 295°C using a vented twin-screw kneading extruder "KZW15-45" (manufactured by Technovel Co., Ltd.). The extruder was then evacuated from the shear section using a vacuum pump to remove moisture, yielding a pellet-shaped resin composition (M1-2). The visual appearance of the resulting resin composition (M1-2) was uniform, and no separation of P3MB and polypropylene was observed. The melt viscosity of the resulting resin composition (M1-2) was 119 Pa s.

[0113] (2) Production of Molded Article A tubular molded article was obtained in the same manner as in "(2) Production of Molded Article" of Example 1, except that in "(2) Production of Molded Article" of Example 1, the pellet-shaped resin composition (M1-1) was changed to the pellet-shaped resin composition (M1-2).

[0114] [Example 9] In Example 5, the pellet-shaped resin composition (M2-1) was replaced with the pellet-shaped resin composition (M1-2), and the molding conditions were changed to those shown in Table 1. A tubular molded article having a two-type, three-layer structure was obtained in the same manner as in Example 5, except that the pellet-shaped resin composition (M2-1) was replaced with the pellet-shaped resin composition (M1-2), and the molding conditions were changed to those shown in Table 1.

[0115] [Example 10] (1) Preparation of resin composition In "(1) Preparation of resin composition" of Example 1, pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (antioxidant "ADK STAB (registered trademark) AO-60" manufactured by ADEKA Corporation), 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane (antioxidant "ADK STAB ( A pellet-shaped resin composition (M1-3) was obtained as the resin composition (M1) in the same manner as in Example 1, except that the alkyl radical scavenger "Sumilizer (registered trademark) GS", manufactured by Sumitomo Chemical Co., Ltd.), 2,4-di-t-amyl-6-[1-(3,5-di-t-amyl-2-hydroxyphenyl)ethyl]phenyl acrylate (alkyl radical scavenger "Sumilizer (registered trademark) GS", manufactured by Sumitomo Chemical Co., Ltd.), and zinc stearate (antacid) were not used.

[0116] (2) Production of Molded Article In "(2) Production of Molded Article" of Example 1, except that the pellet-shaped resin composition (M1-1) was changed to the pellet-shaped resin composition (M1-3) and the molding conditions were changed to the conditions shown in Table 1, a tubular molded article was obtained in the same manner as in Example 1.

[0117] Example 11 (1) Preparation of Resin Composition Polypropylene (trade name "Prime Polypro (registered trademark) PP E701G") was used as the resin composition (M2-3).

[0118] (2) Production of Molded Article In Example 5, the pellet-shaped resin composition (M1-1) for forming the inner layer and outer layer was changed to a pellet-shaped resin composition (M1-3), the pellet-shaped resin composition (M2-1) for forming the middle layer was changed to a pellet-shaped resin composition (M2-3), and the molding conditions were changed to the conditions shown in Table 1. Except for this, a tubular molded article having a two-kind, three-layer structure was obtained in the same manner as in Example 5.

[0119] [Example 12] (Production of a coating material) A pellet-shaped resin composition (M1-1) was obtained in the same manner as in Example 1. The obtained pellet-shaped resin composition (M1-1) was molded under the following conditions to obtain a coating material. Specifically, as a measure to prevent oxygen from being mixed in from the outside, nitrogen purging was performed using nitrogen with a purity of 99.99% from the raw material inlet, and while oxygen was being removed as much as possible, the pellet-shaped resin composition (M1-1) was introduced into the raw material inlet, and the resin composition was melted at a cylinder temperature of 295°C using a single-screw extruder ("PMS50", screw diameter φ50 mm) manufactured by IKG Corporation, and then extruded into a wire coating die (the conductor was a soft copper single wire, diameter 0.5 mm, cross-sectional area 0.20 mm). ２ ) to form a coating layer having a thickness of 1 mm on the outer periphery of the conductor, which was then cooled in a water cooling bath and taken up at a take-off speed of 10 m / min to obtain a coating material.

[0120] [Comparative Example 1] A tubular molded body was obtained in the same manner as in Example 1, except that in "(2) Production of molded body" of Example 1, the pellet-shaped resin composition (M1-1) was changed to the pellet-shaped resin composition (M1-3) and the molding conditions were changed to the conditions shown in Table 1.

[0121] Comparative Example 2 A tubular molded article was obtained in the same manner as in Example 1, except that the molding conditions were changed to those shown in Table 1.

[0122] [Comparative Example 3] A tubular molded product was obtained in the same manner as in Example 1, except that in "(2) Production of molded product" of Example 1, the pellet-shaped resin composition (M1-1) was changed to the pellet-shaped resin composition (M2-1) and the molding conditions were changed to the conditions shown in Table 1.

[0123] Comparative Example 4 (1) Preparation of Resin Composition A pellet-shaped resin composition (M2-4) was obtained as resin composition (M2) in the same manner as in “(1) Preparation of Resin Composition” of Example 1, except that in “(1) Preparation of Resin Composition” of Example 1, “P3MB (obtained in Production Example 1)” was changed to “polymethylpentene (trade name “TPX (registered trademark) DX845”, manufactured by Mitsui Chemicals, Inc.)” and the cylinder temperature was set to 270°C.

[0124] (2) Production of Molded Article In "(2) Production of Molded Article" of Example 1, except that the pellet-shaped resin composition (M1-1) was changed to the pellet-shaped resin composition (M2-4) and the molding conditions were changed to the conditions described in Table 1, a tubular molded article was obtained in the same manner as in Example 1.

[0125] The physical properties of the molded articles obtained in the examples and comparative examples were measured or evaluated by the following methods.

[0126] [Preparation of measurement sheets] When the molded product was a tubular molded product, the tubular molded product was cut open to prepare measurement sheets having the outer and inner surfaces of the tubular molded product on the front and back sides. When the molded product was a coating material, the coating material was cut open and peeled off from the conductor to prepare measurement sheets having the outer and inner surfaces of the coating material on the front and back sides.

[0127] [Method for measuring wall thickness and outer diameter of molded article] The wall thickness and outer diameter of the molded article obtained in each example were measured in accordance with the method described in JIS C 2133:1999. A measurement sheet prepared from the molded article obtained in each example was used as a test piece, and its thickness was measured at 10 points at 10 mm intervals in the longitudinal direction using a micrometer (manufactured by Mitutoyo Corporation, product name "PMU150-25MX", measuring probe 6.3 mmφ), and the average value of these measurements was taken as the thickness of the test piece. This measurement was performed on three test pieces, and the average value of these results was taken as the wall thickness of the molded article. In addition, the outer diameters of the tubular molded article and the coating material were measured at 10 points at 10 mm intervals in the longitudinal direction using the micrometer. This measurement was performed on three test pieces, and the average value of these results was taken as the outer diameter of the molded article.

[0128] [Method for measuring surface roughness Ra of molded article] The surface of the measurement sheet prepared from the molded article obtained in each example, which corresponds to the outer surface of the molded article, was measured by scanning 5,000 μm in the length direction of the tube using a stylus surface profiler "Dektak (registered trademark) 150" manufactured by Bruker Nano under the following conditions: The measurement was performed on three test pieces, and the average of these results was taken as the surface roughness Ra (unit: nm) of the outer surface of the molded article. Scan Type: Standard scan Scan Length: 5,000 μm Duration: 60 sec Range: 524 μm Profile: Hills & Valleys Stylus Type: 12.5 μm Stylus Force: 3.0 mg Cutoff value when waviness is removed: 200 μm Furthermore, the surface roughness Ra of the surface corresponding to the inner surface of the molded body was also measured by the same test method as above.

[0129] [Method for measuring storage modulus E'] Using a measurement sheet prepared from the molded article obtained in each example as a test specimen, the storage modulus E' was determined at each temperature (70°C, 150°C, 270°C) using a dynamic viscoelasticity measuring device "Rheogel-E4000" manufactured by UBM Corporation in accordance with JIS K 7244-1:1998. The measurement was performed three times, and the average of these results was taken as the storage modulus E' of the molded article. - Measurement method: Dynamic viscoelasticity measurement (sine wave) - Measurement mode: Temperature dependency - Chuck: Tension - Waveform: Sine wave - Vibration type: Stop vibration - Chuck distance: 10 mm - Test specimen width: 5 mm - Frequency: 1 Hz - Measurement temperature: -50°C to 300°C - Heating rate: 3°C / min - Measurement atmosphere: In air

[0130] [Method for Measuring Dielectric Breakdown Strength] The dielectric breakdown strength of the molded body obtained in each example was measured in accordance with JIS C 2133:1999 "21. Dielectric Breakdown Voltage." A test sheet prepared from the molded body obtained in each example was used as a test specimen, and the test specimen was left standing for one week in an environment at a temperature of 23°C and a relative humidity of 50%. After that, a cylindrical electrode with a diameter of 25 mm was used as the upper electrode and a cylindrical electrode with a diameter of 25 mm was used as the lower electrode in an environment at a temperature of 23°C and a relative humidity of 50%. The applied voltage was increased at a rate of 100 V / sec, and the voltage (unit: kV) at which the test specimen broke down and short-circuited was read, and this value was taken as the dielectric breakdown voltage of the test specimen. The dielectric breakdown strength (unit: kV / mm) was calculated by dividing the dielectric breakdown voltage by the average thickness (unit: mm) of the test specimen. The thickness of the test specimen was measured by the method described above in [Wall Thickness of Molded Body]. The above measurement was performed on three test specimens, and the average of these results was taken as the dielectric breakdown strength of the molded body.

[0131] [Method for Evaluating Chemical Resistance] The chemical resistance of the molded body obtained in each example was measured in accordance with JIS K 7114:2001. A test sheet (100 mm long) prepared from the molded body obtained in each example was used as a test specimen. After standing for 100 hours in an environment at 23°C and 50% relative humidity, the test specimen was weighed and recorded as the weight m1 before the immersion test. Next, the test specimen and 400 ml of chloroform were placed in a lidded beaker, and the test specimen was immersed in the chloroform for one week at 23°C so that the test specimen was completely immersed in the chloroform. During the immersion period, the chloroform was stirred once a day. The test specimen was then removed from the chloroform and dried in an oven at 50°C for two hours. The weight of the dried test specimen was measured and recorded as the weight m2 after the immersion test. The weight change rate was calculated from the weights m1 and m2 using the following formula: Weight change rate (%) = (m1 - m2) × 100 / m1 The above measurement was performed on three test pieces, and the average of these results was taken as the weight change rate of the molded article after the chloroform immersion test. Those whose weight change rate after the chloroform immersion test was less than 70% were given an "A" rating, and those whose weight change rate was 70% or more were given an "F" rating.

[0132]

[0133] In Table 1, "P3MB" in the "Resin Composition" column refers to the P3MB obtained in Production Example 1, "PP" refers to polypropylene (trade name "Prime Polypro (registered trademark) PP E701G", manufactured by Prime Polymer Co., Ltd.), "PA6P" refers to polyamide 6 (trade name "UBE NYLON 1024JI", manufactured by UBE Corporation), and "TPX" refers to polymethylpentene (trade name "TPX (registered trademark) DX845", manufactured by Mitsui Chemicals, Inc.). In Table 1, the numbers in parentheses in the "Resin Composition" column refer to the content (mass%) of each component in 100% by mass of the total resin components in the resin composition. For example, "P3MB (50) / PP (50)" means that the content of P3MB is 50% by mass and the content of the polypropylene is 50% by mass, out of 100% by mass of the total resin components in the resin composition. In Table 1, "antioxidants, etc." refers to antioxidants, alkyl radical scavengers, and antacids. Therefore, the notation "present" for "antioxidants, etc." indicates that each antioxidant, alkyl radical scavenger, and antacid are contained in the same manner, and the notation "absent" for "antioxidants, etc." indicates that none of antioxidants, alkyl radical scavengers, and antacids are contained. In Table 1, the "extrusion temperature" and "nitrogen purging" in each example refer to the "extrusion temperature" and "presence or absence of nitrogen purging" in "(1) Preparation of resin composition" and "(2) Production of molded body." In Table 1, the notation "(*1)" indicates that the surface roughness Ra of the outer surface could not be measured due to the large surface irregularities of the molded body, and therefore could not be evaluated. In Table 1, "-" indicates that the measurement was not performed.

[0134] From the results in Table 1, it was confirmed that the resin compositions of Examples 1 to 12 were able to achieve both good insulating properties and chemical resistance compared to the resin compositions of each comparative example.

[0135] On the other hand, the molded body of Comparative Example 1 had poor insulating properties because the surface roughness Ra of the outer surface of the molded body exceeded 1,000 nm. The molded body of Comparative Example 2 had such large surface irregularities that the surface roughness Ra of the outer surface of the molded body could not be measured. The molded bodies of Comparative Examples 3 and 4 did not contain P3MB, and therefore had poor insulating properties and chemical resistance.

Claims

1. A molded article containing a resin composition containing a 3-methyl-1-butene polymer as a raw material, the molded article being a tube or a coating material, and the surface roughness Ra of the outer surface of the molded article being 1,000 nm or less.

2. The molded article according to claim 1, wherein the surface roughness Ra of the outer surface is 500 nm or less.

3. The molded article according to claim 1 or 2, wherein the weight change rate after immersion in chloroform at 23°C for one week, as measured in accordance with JIS K 7114:2001, is less than 70%.

4. The molded article according to claim 1 or 2, having a dielectric breakdown strength of 28 kV / mm or more.

5. The molded article according to claim 1 or 2, which has a storage modulus E' at 150°C of 50 MPa or more and a storage modulus E' at 270°C of 1 MPa or more.

6. The molded article according to claim 1 or 2, having a storage modulus E' at 70°C of 1,000 MPa or less.

7. The molded article according to claim 1 or 2, which has a multilayer structure including a layer formed from a resin composition containing the 3-methyl-1-butene polymer.

8. The molded article according to claim 1 or 2, wherein the resin composition contains an antioxidant.

9. The molded article according to claim 8, wherein the antioxidant is at least one selected from the group consisting of phenol-based antioxidants and phosphorus-based antioxidants.

10. A method for producing the molded article according to claim 1 or 2, comprising the step (I) of melt-extruding the resin composition.

11. The method for producing a molded article according to claim 10, wherein the resin composition is melted in an inert atmosphere or in a low-oxygen state during step (I).

12. The method for producing a molded article according to claim 10, wherein the resin composition is melted at 280 to 325°C in step (I).

13. A method for producing a molded article according to claim 10, wherein in step (I), the draw-down ratio [D / E], which is the ratio of the lip gap thickness (D) of the die through which the molten resin composition is melt-extruded to the wall thickness (E) of the molded article extruded from the die, is 1 to 10.

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