Thermoplastic elastomer composition and method for producing a thermoplastic elastomer composition

Abstract

The purpose of the present disclosure is to provide: a thermoplastic elastomer composition which is capable of forming an appearance that has excellent scratch resistance and low gloss; and a method for producing this thermoplastic elastomer composition. The present disclosure provides a thermoplastic elastomer composition which contains a first composition that contains an olefin resin (A), an ethylene / α-olefin copolymer (B) and a crosslinking agent (F), and a second composition that contains a hydrogenated product (C) of a block copolymer which has at least one block that is mainly composed of a conjugated diene monomer unit and at least one block that is mainly composed of a vinyl aromatic monomer unit, wherein: the content of the component (B) is 10-180 parts by mass relative to 100 parts by mass of the component (A); the content of the component (C) is 170-500 parts by mass relative to 100 parts by mass of the component (A); and the ratio W1 / W0 of the gel content W1 to the sum W0 of the content ratio of the component (B) and the content ratio of the component (C) is 0.01-0.70. The present disclosure also provides a method for producing this thermoplastic elastomer composition.

Description

【Technical Field】 【0001】 The present disclosure relates to a thermoplastic elastomer composition and a method for producing the thermoplastic elastomer composition. 【Background Art】 【0002】 A thermoplastic elastomer composition obtained by crosslinking a radically crosslinkable elastomer and a resin having no radical crosslinkability such as polypropylene while melt-kneading in an extruder in the presence of a radical initiator, i.e., so-called dynamic crosslinking, is a known technique and is widely used for applications such as automotive parts. 【0003】 As such a thermoplastic elastomer composition, Patent Document 1 discloses a thermoplastic elastomer composition containing a hydrogenated product of a block copolymer having a vinyl aromatic monomer unit, and containing an ethylene-α-olefin copolymer, an olefin resin, etc. Further, Patent Document 2 discloses a rubber composition containing a crosslinked product composed of an ethylene-α-olefin copolymer having a crosslinking degree of 50% or more and an olefin resin, and a thermoplastic elastomer added later. Furthermore, Patent Document 3 discloses a polymer composition in which polyphenylene ether is blended in a crosslinked thermoplastic crosslinked rubber composition composed of a crosslinkable rubber-like polymer and a thermoplastic resin which is an olefin resin and / or a styrene resin. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 International Publication No. 2010 / 067564 pamphlet 【Patent Document 2】 International Publication No. 00 / 061681 pamphlet 【Patent Document 3】 Japanese Unexamined Patent Application Publication No. 2008-007589 【Summary of the Invention】 [Problems that the invention aims to solve] 【0005】 However, in recent years, thermoplastic elastomer compositions used in automotive interior materials, where a soft touch is particularly desired, have been required to have further improvements in scratch resistance and to be able to form a lower gloss appearance. In light of these requirements, the compositions described in the above-mentioned Patent Documents 1, 2, and 3 have room for improvement in balancing scratch resistance and low-gloss appearance formation. 【0006】 This disclosure provides a thermoplastic elastomer composition suitable for obtaining molded articles that have excellent scratch resistance and can form a low-gloss appearance. Furthermore, this disclosure provides a method for producing a thermoplastic elastomer composition that has excellent scratch resistance and can form a low-gloss appearance. [Means for solving the problem] 【0007】 In other words, this disclosure relates to the following [1] to [6]. [1] A thermoplastic elastomer composition comprising the following first composition and the following second composition, The thermoplastic elastomer composition contains 10 to 180 parts by mass of ethylene-α-olefin copolymer (B) per 100 parts by mass of olefin resin (A). The hydrogenated block copolymer (C) contained in the thermoplastic elastomer composition, which has at least one block mainly composed of conjugated diene monomer units and at least one block mainly composed of vinyl aromatic monomer units, is 170 to 500 parts by mass per 100 parts by mass of olefin resin (A). A thermoplastic elastomer composition characterized in that the ratio W1 / W0 is 0.01 to 0.70, where W0 (mass%) is the sum of the content of the ethylene-α-olefin copolymer (B) and the content of the hydrogenated substance (C) contained in the thermoplastic elastomer composition, and W1 (mass%) is the gel content. [First composition] A composition containing an olefin resin (A), an ethylene-α-olefin copolymer (B), and a crosslinking agent (F). [Second composition] A composition containing a hydrogenated block copolymer (C) having at least one block mainly composed of conjugated diene monomer units and at least one block mainly composed of vinyl aromatic monomer units, characterized in that the amount of hydrogenated block copolymer (C) contained in the second composition is 30 parts by mass or more per 100 parts by mass of olefin resin (A) contained in the thermoplastic elastomer composition. 【0008】 [2] The thermoplastic elastomer composition according to item [1], wherein the hydrogenated substance (C) is a styrene-based block copolymer. 【0009】 [3] The thermoplastic elastomer composition according to item [1] or item [2], wherein the amount of hydrogenated substance (C) contained in the thermoplastic elastomer composition is 180 to 250 parts by mass per 100 parts by mass of the olefin resin (A). 【0010】 [4] The first composition is obtained by melt-kneading the olefin resin (A), the ethylene-α-olefin copolymer (B), and the crosslinking agent (F). The thermoplastic elastomer composition according to any one of claims [1] to [3], wherein the first composition and the second composition are melt-kneaded together. 【0011】 [5] Having either (i) or (ii) below, (i) A step of dynamically crosslinking an olefin resin (A) and an ethylene-α-olefin copolymer (B) using a crosslinking agent (F), then adding a hydrogenated substance (C) downstream of the same extruder and melt-kneading the mixture, and then removing the thermoplastic elastomer composition from the extruder. (ii) Dynamically crosslink the olefin resin (A) and the ethylene-α-olefin copolymer (B) using a crosslinking agent (F). After the crosslinking reaction is completed, take out the crosslinked product from the extruder, melt the crosslinked product and the hydrogenated product (C) again, and extrude to obtain a thermoplastic elastomer composition. The content of the ethylene-α-olefin copolymer (B) contained in the thermoplastic elastomer composition is 10 to 180 parts by mass with respect to 100 parts by mass of the olefin resin (A). The content of the hydrogenated product (C) contained in the thermoplastic elastomer composition is 170 to 500 parts by mass with respect to 100 parts by mass of the olefin resin (A). The method for producing a thermoplastic elastomer composition is characterized in that when the sum of the content ratio of the ethylene-α-olefin copolymer (B) and the content ratio of the hydrogenated product (C) contained in the thermoplastic elastomer composition is W0 (mass%) and the gel content is W1 (mass%), the value of the ratio W1 / W0 is 0.01 to 0.70. [6] An instrument panel skin made of the composition according to item [1]. 【Advantages of the Invention】 【0012】 According to the present disclosure, it is possible to provide a thermoplastic elastomer composition having excellent scratch resistance and capable of forming a low-gloss appearance. Further, according to the present disclosure, it is possible to provide a method for producing a thermoplastic elastomer composition having excellent scratch resistance and capable of forming a low-gloss appearance. 【Modes for Carrying Out the Invention】 【0013】 In the present disclosure, the descriptions of "XX or more and YY or less" and "XX to YY" representing numerical ranges mean numerical ranges including the lower limit and the upper limit which are endpoints, unless otherwise specified. Also, when numerical ranges are described stepwise, the upper limit and the lower limit of each numerical range can be arbitrarily combined. Furthermore, the description of "A and / or B" is a concept including any of the cases of A, the case of B, and the case of both A and B. 【0014】 <Olefin resin (A)> The olefin resin (A) [hereinafter may be referred to as "component (A)"], which is one of the components contained in the first composition in the thermoplastic elastomer composition of the present disclosure, is not particularly limited as long as it is a crystalline polymer (resin) obtained from olefins, and it is preferably a polymer composed of a crystalline high molecular weight solid product obtained by polymerizing one or more olefins by either a high-pressure method or a low-pressure method. The olefin resin (A) may be used alone or in combination of two or more. 【0015】 Examples of the olefins that are the raw materials of component (A) according to the present disclosure include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 2-methyl-1-propene, 3-methyl-1-pentene, 4-methyl-1-pentene, 5-methyl-1-hexene, and the like. These olefins may be used alone or in combination of two or more. Among these olefin resins (A), propylene-based polymers are preferred in terms of heat resistance and oil resistance. 【0016】 The propylene-based polymer according to the present disclosure refers to a polymer in which the content of the structural unit derived from propylene among the structural units constituting the polymer is 50 mol% or more, and the content of the structural unit derived from propylene in component (A) is preferably 90 mol% or more. The propylene-based polymer according to the present disclosure may be one kind or two or more kinds. The propylene-based polymer according to the present disclosure may be a propylene homopolymer or a copolymer of propylene and a comonomer other than propylene, but a propylene homopolymer is preferred. 【0017】 The structure of the propylene polymer relating to this disclosure is not particularly limited. For example, the propylene-derived constituent unit may be an isotactic, syndiotactic, or atactic structure. Furthermore, the copolymer may be random (also referred to as random PP), block (also referred to as block PP: bPP), or graft type. The comonomer can be any other monomer copolymerizable with propylene, and α-olefins having 2 or 4 to 10 carbon atoms are preferred. Specifically, examples include ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene, among which ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, and 1-octene are preferred. One comonomer may be used, or two or more may be used. The content of comonomer-derived structural units in the copolymer is preferably 10 mol% or less, from the viewpoint of flexibility and other factors. 【0018】 The propylene polymers relating to this disclosure may be synthesized by conventionally known methods or commercially available products may be used. Examples of commercially available products include polypropylene from Sun Allomer Co., Ltd., Prime Polypropylene from Prime Polymer Co., Ltd., Novatec from Nippon Polypropylene Co., Ltd., and SCG PP from SCG Plastics Co., Ltd. The propylene polymers relating to this disclosure may be crystalline polymers or amorphous polymers. Here, crystalline means that a melting point (Tm) is observed in differential scanning calorimetry (DSC). 【0019】 If the propylene polymer according to this disclosure is a crystalline polymer, its melting point (according to the measurement method of JIS K 7121) is preferably 100°C or higher, more preferably 120°C or higher, preferably 180°C or lower, and more preferably 170°C or lower, from the viewpoint of heat resistance and the like. The MFR (measured according to the ASTM D 1238-65T method, at 230°C and a 2.16 kg load) of component (A) relating to this disclosure is preferably 0.1 to 100 g / 10 min, and more preferably 0.1 to 50 g / 10 min. When the MFR of component (A) relating to this disclosure is within the above range, a composition with excellent heat resistance, mechanical strength, fluidity, and moldability can be easily obtained. 【0020】 <Ethylene-α-olefin copolymer (B)> The ethylene-α-olefin copolymer (B), which is one of the components included in the first composition of the thermoplastic elastomer composition of this disclosure, is an ethylene-α-olefin copolymer containing units derived from ethylene and units derived from α-olefin. The ethylene-α-olefin copolymer (B) (hereinafter sometimes referred to as "component (B)") according to this disclosure can be obtained by copolymerizing ethylene and α-olefin at least. The number of carbon atoms in the α-olefin is not particularly limited, but is preferably 3 to 20. 【0021】 Examples of α-olefins having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, and 1-dodecene. Among these, α-olefins having 5 to 12 carbon atoms are preferred from the viewpoint of imparting flexibility, propylene, 1-butene, and 1-octene are more preferred, and 1-octene is even more preferred. 【0022】 Component (B) according to this disclosure typically contains 70 to 99 mol%, preferably 80 to 97 mol%, of units derived from ethylene, and 1 to 30 mol%, preferably 3 to 20 mol%, of units derived from α-olefins (provided the total amount of units derived from ethylene and α-olefins is 100 mol%). The content ratio of units derived from ethylene being within the above range is preferable for obtaining a thermoplastic elastomer composition with excellent mechanical strength. 【0023】 Component (B) of the present disclosure may be copolymerized with monomers having unsaturated bonds as needed. Preferred monomers having unsaturated bonds include, for example, conjugated diolefins such as butadiene and isoprene, unconjugated diolefins such as 1,4-hexadiene; cyclic diene compounds such as dicyclopentadiene and norbornene derivatives; and acetylenes. Among these, ethylidene norbornene (ENB) and dicyclopentadiene (DCPD) are more preferred from the viewpoint of flexibility. 【0024】 Component (B) relating to this disclosure typically has an MFR (ASTM D1238 load 2.16 kg, temperature 190°C) in the range of 0.1 to 20 g / 10 min, preferably 0.3 to 10 g / 10 min. By setting the MFR within the above range, a thermoplastic elastomer composition with superior balance characteristics between fluidity and mechanical strength can be obtained. 【0025】 The component (B) relating to this disclosure typically has a density of 0.8 to 0.9 g / cm³. 3 It is within the range. Component (B) relating to this disclosure can be produced using known polymerization catalysts such as Ziegler-Natta catalysts, vanadium-based catalysts, and metallocene catalysts. The polymerization method is not particularly limited and can be carried out using liquid-phase polymerization methods such as solution polymerization, suspension polymerization, and bulk polymerization, gas-phase polymerization, and other known polymerization methods. Furthermore, these copolymers are not limited as long as they achieve the effects of this disclosure and are available as commercial products. Examples of commercial products include Engage 8842 (ethylene-1-octene copolymer) from Dow Chemical, Vistalon® from ExxonMobil, Esprene® from Sumitomo Chemical Co., Ltd., Mitsui EPT®, Tuffmer P®, and Tuffmer A® from Mitsui Chemicals, Inc. 【0026】 <Crosslinking agent (F)> The crosslinking agent (F), which is one of the components included in the first composition of the thermoplastic elastomer composition of this disclosure, is not particularly limited as long as it is a compound that can crosslink the ethylene-α-olefin copolymer (B), but an organic peroxide is preferred. 【0027】 Specific examples of organic peroxides include 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(t-hexylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(t-hexylperoxy)cyclohexane, 1,1-bis(t-butylperoxy)cyclododecane, 1,1-bis(t-butylperoxy)cyclohexane, 2,2-bis(t-butylperoxy)octane, n-butyl-4,4-bis(t-butylperoxy)butane, and n-butyl-4,4-bis(t Peroxyketals such as butylperoxy valerate; dialkylperoxides such as di-t-butylperoxide, dicumylperoxide, t-butylcumylperoxide, α,α'-bis(t-butylperoxy-m-isopropyl)benzene, α,α'-bis(t-butylperoxy)diisopropylbenzene, 2,5-dimethyl-2,5-bis(t-butylperoxy)hexane, and 2,5-dimethyl-2,5-bis(t-butylperoxy)hexine-3; acetylperoxide, isobutylperoxide Diacyl peroxides such as oxide, octanoyl peroxide, decanoyl peroxide, lauroyl peroxide, 3,5,5-trimethylhexanoyl peroxide, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, m-trioyl peroxide; t-butyl peroxyacetate, t-butyl peroxyisobutyrate, t-butyl peroxy-2-ethylhexanoate, t-butyl peroxylaurate, t-butyl peroxybenzoate, di-t-butyl peroxy Examples include peroxyesters such as xyisophthalate, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, t-butylperoxymaleic acid, t-butylperoxyisopropyl carbonate, and cumylperoxyoctate; and hydroperoxides such as t-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide, and 1,1,3,3-tetramethylbutylperoxide. 【0028】 Among these components (F), 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-bis(t-butylperoxy)hexane, and 2,5-dimethyl-2,5-bis(t-butylperoxy)hexyn-3 are preferred from the viewpoint of thermal decomposition temperature and crosslinking performance. 【0029】 The component (F) relating to this disclosure may be used alone or in combination of two or more types. If the thermoplastic elastomer composition of this disclosure contains component (F), it is preferable to use the following crosslinking aid in combination. 【0030】 <Crosslinking agent (G)> The crosslinking aid (G) relating to this disclosure includes various known crosslinking aids, specifically monofunctional monomers and polyfunctional monomers. Such crosslinking aids can control the rate of the crosslinking reaction. As monofunctional monomers, for example, radically polymerizable vinyl monomers are preferred, and examples include aromatic vinyl monomers, unsaturated nitrile monomers such as acrylonitrile and methacrylonitrile, acrylic acid ester monomers, methacrylic acid ester monomers, acrylic acid monomers, methacrylic acid monomers, maleic anhydride monomers, and N-substituted maleimide monomers. 【0031】 Specific examples of monofunctional monomers include, for example, styrene, methylstyrene, chloromethylstyrene, hydroxystyrene, tert-butoxystyrene, acetoxystyrene, chlorostyrene, acrylonitrile, methacrylonitrile, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, maleic anhydride, methyl maleic anhydride, 1,2-dimethyl maleic anhydride, ethyl maleic anhydride, phenyl maleic anhydride, N-methyl maleimide, N-ethyl maleimide, N-cyclohexyl maleimide, N-lauryl maleimide, and N-cetyl maleimide. Among these, styrene, acrylonitrile, methacrylonitrile, methyl acrylate, maleic anhydride, and N-methyl maleimide are preferred from the viewpoint of ease of reaction and versatility. These monofunctional monomers may be used individually or in combination of two or more. 【0032】 A polyfunctional monomer is a monomer having multiple radically polymerizable functional groups, and a monomer having a vinyl group is preferred. The number of functional groups in a polyfunctional monomer is preferably two or three. 【0033】 Specific examples of polyfunctional monomers include divinylbenzene, triallyl isocyanurate, triallyl cyanurate, diacetone diacrylamide, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, diethylene glycol dimethacrylate, diisopropenylbenzene, p-quinone dioxime, p,p'-dibenzoylquinone dioxime, phenylmaleimide, allyl methacrylate, N,N'-m-phenylenebismaleimide, diallyl phthalate, tetraallyloxyethane, and 1,2-polybutadiene, with divinylbenzene and triallyl isocyanurate being more preferred. These polyfunctional monomers may be used individually or in combination of two or more. 【0034】 <Hydrogenated block copolymer (C)> The hydrogenated block copolymer (C) included in the second composition of the thermoplastic elastomer composition of this disclosure (hereinafter, this may be referred to as "component (C)", "hydrogenated product (C)", or "hydrogenated product (C)") is a hydrogenated block copolymer having at least one block mainly composed of conjugated diene monomer units and at least one block mainly composed of vinyl aromatic monomer units. 【0035】 Component (C) relating to this disclosure is obtained by hydrogenating (hereinafter sometimes referred to as "hydrogenation") at least a portion of monomer units derived from a conjugated diene monomer. Here, "vinyl aromatic monomer unit" refers to the constituent unit of a polymer resulting from the polymerization of vinyl aromatic monomers, and its structure is a molecular structure in which the two carbon atoms of a substituted ethylene group derived from a substituted vinyl group are bonded. Similarly, "conjugated diene monomer unit" refers to the constituent unit of a polymer resulting from the polymerization of conjugated dienes, and its structure is a molecular structure in which the two carbon atoms of an olefin derived from a conjugated diene monomer are bonded. 【0036】 In component (C) relating to this disclosure, "mainly" means that the copolymer block contains 50 mol% or more, preferably 60 mol% or more, and more preferably 65 mol% or more, of monomer units derived from a conjugated diene monomer (or vinyl aromatic monomer). For example, a block mainly consisting of conjugated diene monomer units means that the block contains 50 mol% or more, preferably 60 mol% or more, and more preferably 65 mol% or more, of monomer units derived from a conjugated diene monomer. 【0037】 The vinyl aromatic monomer in component (C) of this disclosure is not particularly limited, and examples include vinyl aromatic compounds such as styrene, α-methylstyrene, p-methylstyrene, divinylbenzene, 1,1-diphenylethylene, N,N-dimethyl-p-aminoethylstyrene, and N,N-diethyl-p-aminoethylstyrene. These may be used individually or in combination of two or more. Among these, styrene is preferred from an economic standpoint. 【0038】 The conjugated diene monomer in component (C) of this disclosure is a diolefin having one pair of conjugated double bonds, and examples include 1,3-butadiene (butadiene), 2-methyl-1,3-butadiene (isoprene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, and 1,3-hexadiene. Among these, butadiene and isoprene are preferred from the viewpoint of economy. These may be used individually or in combination of two or more. 【0039】 The arrangement of each block in component (C) relating to this disclosure is not particularly limited, and a suitable arrangement can be adopted as appropriate. For example, if a polymer block consisting of vinyl aromatic monomer units is represented by S, and a polymer block consisting of units in which at least a portion of conjugated diene monomer units is hydrogenated is represented by B, then the hydrogenated products of this block copolymer are SB, S(BS) n1 (Here, n1 represents an integer from 1 to 3.) S(BSB) n2 Linear block copolymers represented by (where n² represents an integer between 1 and 2), etc., and (SB) n3 Copolymers represented by X (where n3 represents an integer from 3 to 6, and X represents a coupling agent residue such as silicon tetrachloride, tin tetrachloride, or a polyepoxy compound) are examples. Among these, linear block copolymers of type 2 (diblock) of SB, type 3 (triblock) of SBS, and type 4 (tetrablock) of SBSB are preferred. 【0040】 Here, polymer block B may be a polymer block consisting only of conjugated diene monomer units, or a polymer block mainly containing conjugated diene monomer units and also containing vinyl aromatic monomer units (conjugated diene monomer units and vinyl aromatic monomer units copolymerized), and in either case, at least a portion of the conjugated diene monomer units is hydrogenated. 【0041】 The content of vinyl aromatic monomer units in component (C) relating to this disclosure is 10 to 80% by mass, preferably 12 to 80% by mass, and more preferably 12 to 70% by mass, from the viewpoint of heat resistance and dispersibility. By increasing the content of vinyl aromatic monomer units to 10% by mass or more, the mechanical properties can be further improved, and by decreasing it to 80% by mass or less, the low-temperature properties can be further improved. 【0042】 The content of vinyl aromatic monomer units in component (C) relating to this disclosure can be measured by nuclear magnetic resonance spectroscopy (NMR). The content of vinyl aromatic monomer unit blocks in component (C) relating to this disclosure is preferably 10% by mass or more, and more preferably 10 to 40% by mass, from the viewpoint of mechanical strength. Here, the content of vinyl aromatic compound polymer blocks in component (C) is defined by the following formula, using the mass of vinyl aromatic compound polymer blocks obtained by a method of oxidative decomposition of the copolymer before hydrogenation with tert-butyl hydroperoxide using osmium tetroxide as a catalyst (the method described in IM Kolthoff, et al., J. Polym. Sci. 1, 429 (1946), hereinafter also referred to as the "osmium tetroxide decomposition method") (where vinyl aromatic compound polymers with an average degree of polymerization of about 30 or less are excluded). Vinyl aromatic compound polymer block content (mass%) = (Mass of vinyl aromatic compound polymer blocks in copolymer before hydrogenation / Mass of copolymer before hydrogenation) × 100 【0043】 If multiple polymer blocks exist in component (C) of this disclosure, their structures, such as molecular weight and composition, may be the same or different. For example, component (C) may contain a hydrogenated copolymer block containing conjugated diene monomer units and vinyl aromatic monomer units, and a hydrogenated copolymer block mainly composed of conjugated diene monomer units. The boundaries and ends of each block do not necessarily need to be clearly distinguishable. The distribution of vinyl aromatic monomer units in each polymer block is not particularly limited and may be uniformly distributed, tapered, stepped, convex, or concave. Furthermore, crystalline portions may be present in the polymer block. 【0044】 The distribution of vinyl units of conjugated diene monomer units in each polymer block within component (C) of this disclosure is not particularly limited, and for example, the distribution may be biased. Methods for controlling the distribution of vinyl units include adding a vinylizing agent during polymerization and changing the polymerization temperature. Furthermore, the distribution of hydrogenation rates of conjugated diene monomer units may also be biased. The distribution of hydrogenation rates can be controlled by changing the distribution of vinyl units, or by copolymerizing isoprene and butadiene and then hydrogenating using a hydrogenation catalyst described later, utilizing the difference in hydrogenation rates between isoprene units and butadiene units. Component (C) relating to this disclosure is characterized in that, from the viewpoint of heat resistance, aging resistance, and weather resistance, preferably 75 mol% or more, more preferably 85 mol% or more, and even more preferably 97 mol% or more of the unsaturated bonds contained in the conjugated diene monomer unit before hydrogenation are hydrogenated. 【0045】 The hydrogenation catalyst used is not particularly limited and is generally known. (1) Supported heterogeneous hydrogenation catalysts in which metals such as Ni, Pt, Pd, Ru are supported on carbon, silica, alumina, diatomaceous earth, etc. (2) A so-called Ziegler-type hydrogenation catalyst using organic acid salts such as Ni, Co, Fe, Cr or transition metal salts such as acetylacetone salt and a reducing agent such as organoaluminum, (3) Homogeneous hydrogenation catalysts such as organometallic compounds like Ti, Ru, Rh, and Zr, or so-called organometallic complexes, can be used. 【0046】 Specific hydrogenation catalysts that can be used include those described in Japanese Patent Publication No. 42-008704, Japanese Patent Publication No. 43-006636, Japanese Patent Publication No. 63-004841, Japanese Patent Publication No. 01-037970, Japanese Patent Publication No. 01-053851, Japanese Patent Publication No. 02-009041, etc. Among these, preferred hydrogenation catalysts include reducing organometallic compounds such as titanocene compounds. 【0047】 Examples of titanocene compounds include those described in Japanese Patent Publication No. 08-109219, and specific examples include compounds having at least one ligand with a (substituted) cyclopentadienyl skeleton, an indenyl skeleton, or a fluorenyl skeleton, such as biscyclopentadienyl titanium dichloride and monopentamethylcyclopentadienyl titanium trichloride. 【0048】 Examples of reducing organometallic compounds include organoalkali metal compounds such as organolithium, organomagnesium compounds, organoaluminum compounds, organoboron compounds, and organozinc compounds. The polymerization method for the block copolymer before hydrogenation in component (C) relating to this disclosure is not particularly limited, and known methods may be employed. Examples include the methods described in Japanese Patent Publication No. 36-019286, Japanese Patent Publication No. 43-017979, Japanese Patent Publication No. 46-032415, Japanese Patent Publication No. 49-036957, Japanese Patent Publication No. 48-002423, Japanese Patent Publication No. 48-004106, Japanese Patent Publication No. 56-028925, Japanese Unexamined Patent Publication No. 59-166518, Japanese Unexamined Patent Publication No. 60-186577, etc. 【0049】 If necessary, component (C) may have a polar group. Examples of polar groups include hydroxyl groups, carboxyl groups, carbonyl groups, thiocarbonyl groups, acid halide groups, acid anhydride groups, thiocarboxylic acid groups, aldehyde groups, thioaldehyde groups, carboxylic acid ester groups, amide groups, sulfonic acid groups, sulfonic acid ester groups, phosphoric acid groups, phosphoric acid ester groups, amino groups, imino groups, nitrile groups, pyridyl groups, quinoline groups, epoxy groups, thioepoxy groups, sulfide groups, isocyanate groups, isothiocyanate groups, silicon halide groups, alkoxysilicon groups, tin halide groups, boronic acid groups, boron-containing groups, boronic acid bases, alkoxytin groups, and phenyltin groups. 【0050】 The vinyl bond content in the conjugated diene monomer units in the block copolymer before hydrogenation of component (C) relating to this disclosure is preferably 5 mol% or more from the viewpoint of flexibility and scratch resistance, and preferably 90 mol% or less from the viewpoint of productivity, elongation at break, and scratch resistance. The vinyl bond content in the conjugated diene monomer units is more preferably 10 to 90 mol%, and even more preferably 10 to 80 mol%. Here, vinyl bond content means the proportion of those incorporated by 1,2-bonds and 3,4-bonds among the 1,2-bonds, 3,4-bonds and 1,4-bonds incorporated in the conjugated diene before hydrogenation. The vinyl bond content can be measured by NMR. 【0051】 The weight-average molecular weight of component (C) before crosslinking is not particularly limited, but from the viewpoint of scratch resistance, it is preferably 50,000 or more, from the viewpoint of moldability, it is preferably 400,000 or less, and more preferably 50,000 to 300,000. The molecular weight distribution (Mw / Mn: weight-average molecular weight / number-average molecular weight) is not particularly limited, but from the viewpoint of scratch resistance, it is preferably close to 1. The weight-average molecular weight and number-average molecular weight can be determined by gel permeation chromatography (GPC; Shimadzu Corporation, instrument name "LC-10") using tetrahydrofuran (1.0 mL / min) as the solvent and an oven temperature of 40°C, with columns: TSKgelGMHXL (4.6 mm ID × 30 cm, 2 columns). The weight-average molecular weight (Mw), number-average molecular weight (Mn), and molecular weight distribution (Mw / Mn) are calculated as polystyrene-equivalent molecular weight. 【0052】 The component (C) relating to this disclosure is not particularly limited, and the conjugated diene monomers and vinyl aromatic monomers described above can be used. Among these, preferred combinations from the viewpoint of balancing mechanical strength and impact resistance include blocks containing butadiene units and styrene units, and blocks containing isoprene units and styrene units. 【0053】 Component (C) relating to this disclosure may consist mainly of conjugated diene monomer units, and the content of each monomer is not particularly limited. In particular, from the viewpoint of balancing mechanical strength and impact resistance, the content of vinyl aromatic monomer units in the copolymer block is preferably 10% by mass or more and less than 80% by mass, and more preferably 10% by mass or more and less than 70% by mass. 【0054】 Examples of commercially available components (C) related to this disclosure include SOES1605, S1606, and ToughTec H1041 and H1221 (all registered trademarks) manufactured by Asahi Kasei Corporation. 【0055】 <Softener (D)> The plasticizer (D) [hereinafter sometimes referred to as "component (D)"] which is one of the components that may be included in the thermoplastic elastomer composition, the first composition and / or the second composition of this disclosure, is not particularly limited, but plasticizers commonly used in rubber can be used. From the viewpoint of compatibility with the above-mentioned propylene polymer (A) and ethylene-α-olefin copolymer (B), etc., process oils consisting of hydrocarbons such as paraffinic, naphthenic, and aromatic hydrocarbons are preferred. Among these components (D), process oils mainly composed of paraffinic hydrocarbons are preferred from the viewpoint of weather resistance and colorability, and process oils mainly composed of naphthenic hydrocarbons are preferred from the viewpoint of compatibility. From the viewpoint of thermal and light stability, the content of aromatic hydrocarbons in the process oil is preferably 10% or less, more preferably 5% or less, and even more preferably 1% or less, in terms of the carbon number ratio specified in ASTM D2140-97. 【0056】 <Polyorganosiloxane (E)> The structure of polyorganosiloxane (E) [hereinafter sometimes referred to as "component (E)"], which is one of the components that may be included in the thermoplastic elastomer composition, the first composition and / or the second composition of this disclosure, is not particularly limited, but from the viewpoint of abrasion resistance and tactile feel, it is preferable to have a linear, branched, or crosslinked polymer structure. 【0057】 Component (E) relating to this disclosure is not particularly limited and known components may be used. Preferred polyorganosiloxanes are polymers containing siloxane units having substituents such as alkyl groups, vinyl groups, and aryl groups, and among these, polyorganosiloxanes having alkyl groups are particularly preferred, and polyorganosiloxanes having methyl groups are more preferred. 【0058】 Specific examples of polyorganosiloxanes having methyl groups include, for example, polydimethylsiloxane, polymethylphenylsiloxane, and polymethylhydrogensiloxane. Among these, polydimethylsiloxane is preferred. 【0059】 The kinematic viscosity of component (E) relating to this disclosure is not particularly limited, but from the viewpoint of abrasion resistance and scratch resistance, it is preferable that the kinematic viscosity (25°C) specified in JIS Z8803 is 5,000 centistokes (cSt) or higher. Furthermore, from the viewpoint that the dispersibility of component (E) in the resulting thermoplastic elastomer composition tends to improve, resulting in a superior appearance and further improved quality stability during melt extrusion, it is preferable that the kinematic viscosity of component (E) is less than 3 million cSt. More preferably, the kinematic viscosity of component (E) is 10,000 cSt or more and less than 3 million cSt, and even more preferably 50,000 cSt or more and less than 3 million cSt. 【0060】 <Thermoplastic elastomer composition> The thermoplastic elastomer composition disclosed herein is a thermoplastic elastomer composition comprising the following first composition and the following second composition, The content of component (B) in the thermoplastic elastomer composition is 10 to 180 parts by mass per 100 parts by mass of component (A). The content of component (C) in the thermoplastic elastomer composition is 170 to 500 parts by mass per 100 parts by mass of component (A). The ratio (W1 / W0) of the sum of the content of component (B) and the content of component (C) in the thermoplastic elastomer composition, where W0 (mass%) is the sum of the gel content and W1 (mass%) is the gel content, is 0.01 to 0.70. The value of W1 / W0 is preferably 0.10 to 0.60, and more preferably 0.20 to 0.50. 【0061】 The W1 / W0 value can be adjusted by changing the compositions of the first and second compositions contained in the thermoplastic elastomer composition of this disclosure, and varies considerably, particularly depending on the content of component (C) in the first composition and the content of component (F) in the second composition. Further details will be described later. 【0062】 The thermoplastic elastomer compositions of this disclosure have a Shore A hardness (10-second value) (according to the measurement method of JIS K 6253) preferably of 40 to 90, more preferably of 50 to 85, and even more preferably of 60 to 85. If the Shore A hardness (10-second value) of the thermoplastic elastomer composition of this disclosure is within the aforementioned range, it is possible to easily form a molded article that has aesthetic properties such as tactile feel and a high-quality appearance, as well as scratch resistance. The Shore A hardness (10-second value) can be measured specifically by the method described in the following examples. 【0063】 The melt flow rate of the thermoplastic elastomer composition of this disclosure (according to the measurement method of JIS K 7210, 230°C, 2.16 kg load) is preferably 0.5 to 300 g / 10 min, more preferably 1 to 200 g / 10 min, and even more preferably 2 to 200 g / 10 min, in order to obtain a composition with excellent moldability. 【0064】 The content of component (B) in the thermoplastic elastomer composition of this disclosure is 10 to 180 parts by mass, preferably 20 to 175 parts by mass, more preferably 50 to 170 parts by mass, and even more preferably 80 to 170 parts by mass, per 100 parts by mass of component (A). 【0065】 If the content of component (B) is less than 10 parts by mass per 100 parts by mass of component (A), a desirable appearance (gloss) cannot be obtained. Furthermore, if it exceeds 180 parts by mass, sufficient fluidity cannot be obtained. 【0066】 The content of component (C) in the thermoplastic elastomer composition of this disclosure is 170 to 500 parts by mass, preferably 175 to 400 parts by mass, and more preferably 180 to 250 parts by mass, per 100 parts by mass of component (A). 【0067】 If the content of component (C) is less than 170 parts by mass per 100 parts by mass of component (A), the thermoplastic elastomer may not have desirable scratch resistance. On the other hand, if it exceeds 500 parts by mass, the thermoplastic elastomer may not have a desirable appearance (gloss) and sufficient heat resistance. 【0068】 <<First composition>> The first composition included in the thermoplastic elastomer composition of this disclosure is a composition containing the above-mentioned olefin resin (A), the above-mentioned ethylene-α-olefin copolymer (B), and the above-mentioned crosslinking agent (F). The first composition may also contain components (D) and (E), as well as other additives described later, to the extent that they do not impede the effects of this disclosure. The content of component (F) in the first composition relating to this disclosure is preferably 0.2 to 3.0 parts by mass, more preferably 0.3 to 2.0 parts by mass, and even more preferably 0.4 to 1.5 parts by mass, per 100 parts by mass of component (A). 【0069】 The first composition relating to this disclosure may optionally contain a crosslinking aid (G). Known crosslinking aids can be used without limitation, but for example, divinylbenzene can be used. The content of crosslinking aid (G) is preferably 0.5 to 10.0 parts by mass, and more preferably 1.0 to 5.0 parts by mass, per 100 parts by mass of component (A). 【0070】 The first composition relating to this disclosure may contain component (C) in such a content that the W1 / W0 value is 0.70 or less, and it is preferable, and more preferable, that it substantially omits component (C). When the content of component (C) in the first composition increases, the W1 / W0 value tends to increase, and when the W1 / W0 value exceeds 0.70, the desired scratch resistance cannot be obtained. 【0071】 ≪Second composition≫ The second composition included in the thermoplastic elastomer composition of this disclosure is a composition containing the above component (C). The content of component (C) in the second composition is 30 parts by mass or more, preferably 80 parts by mass, and more preferably 100 parts by mass or more, based on 100 parts by mass of olefin resin (A) contained in the thermoplastic elastomer composition. The upper limit is not particularly limited, as long as it does not exceed 500 parts by mass per 100 parts by mass of olefin resin (A) contained in the thermoplastic elastomer composition. The second composition relating to this disclosure may contain component (F) in an amount of 0 to 5 parts by mass per 100 parts by mass of component (C). Here, the range of 0 to 5 parts by mass for component (F) means that component (F) may or may not be included, but if it is included, it must be 5 parts by mass or less. 【0072】 Furthermore, the second composition preferably contains substantially no component (F), and more preferably does not contain it at all. When the content of component (F) in the second composition exceeds 5 parts by mass, the W1 / W0 value tends to increase, and the thermoplastic elastomer obtained when the W1 / W0 value exceeds 0.70 does not provide the desired scratch resistance. 【0073】 If the thermoplastic elastomer composition of this disclosure contains, in addition to component (A), etc., component (D) and component (E), the content of component (D) is 0 to 300 parts by mass, preferably 10 to 250 parts by mass, more preferably 20 to 200 parts by mass, per 100 parts by mass of component (A), from the viewpoint of moldability and heat resistance, and the content of component (E) is in the range of 2 to 40 parts by mass, more preferably 4 to 35 parts by mass, and even more preferably 5 to 30 parts by mass. 【0074】 When the content of component (E) is 2 parts by mass or more, the scratch resistance improvement effect of the resulting thermoplastic elastomer composition is sufficiently exhibited, and when it is 40 parts by mass or less, it exhibits excellent dispersibility in the thermoplastic elastomer composition. Components (D) and (E) relating to this disclosure may be included in the first composition, the second composition, or a third component, insofar as they are included in the thermoplastic elastomer composition of this disclosure. Furthermore, the second composition may contain component (A), component (B), and component (G), as well as other additives described later, to the extent that they do not impede the effects of the present disclosure. 【0075】 The thermoplastic elastomer composition of this disclosure may contain, in addition to the above-mentioned component (A), inorganic fillers, plasticizers, and other additives. Furthermore, these inorganic fillers, plasticizers, and other additives may be included in the first composition, the second composition, or a third component, insofar as they are included in the thermoplastic elastomer composition of the present disclosure. 【0076】 Examples of inorganic fillers include calcium carbonate, magnesium carbonate, silica, carbon black, glass fiber, titanium dioxide, clay, mica, talc, magnesium hydroxide, and aluminum hydroxide. 【0077】 Examples of plasticizers include polyethylene glycol and phthalate esters such as dioctyl phthalate (DOP). 【0078】 Other additives include, for example, organic and inorganic pigments such as carbon black, titanium dioxide, or phthalocyanine black; heat stabilizers such as 2,6-di-t-butyl-4-methylphenol and n-octadecyl-3-(3,5'-di-t-butyl-4-hydroxyphenyl)propionate; antioxidants such as trisnonylphenyl phosphite and distearyl pentaerythritol diphosphite; UV absorbers such as 2-(2'-hydroxy-5'methylphenyl)benzotriazole and 2,4-dihydroxybenzophenone; bis-[2,2,6,6-tetramethyl-4-piperidinyl]sebacate, tetramethyl Examples include light stabilizers such as (2,2,6,6-tetramethyl-4-piperidinyl)-1,2,3,4-butanetetracarboxylate; flame retardants such as ammonium polyphosphate, trioctyl phosphate, and magnesium hydroxide; silicone oils such as dimethyl silicone oil and methylphenyl silicone oil; antiblocking agents such as stearic acid amide and erucic acid amide; foaming agents such as sodium bicarbonate and N,N'-dinitrosopentamethylenetetramine; antistatic agents such as palmitate monoglyceride and stearate monoglyceride; and antibacterial agents such as silver ion-supported zeolite and thiosulfite silver complexes. Furthermore, the thermoplastic elastomer composition of this disclosure may also contain biomass-derived raw materials. 【0079】 <Method for manufacturing thermoplastic elastomers> The thermoplastic elastomer manufacturing method of this disclosure may have the following steps. That is, the thermoplastic elastomer manufacturing method of this disclosure is (i) A step of dynamically crosslinking an olefin resin (A) and an ethylene-α-olefin copolymer (B) using a crosslinking agent (F), then adding a hydrogenated substance (C) downstream of the same extruder, adding other components as necessary, melt-kneading, and then removing the composition of the present disclosure from the extruder, or (ii) A step of dynamically crosslinking an olefin resin (A) and an ethylene-α-olefin copolymer (B) using a crosslinking agent (F), removing the crosslinked body from the extruder after the crosslinking reaction is complete, remelting the crosslinked body and a hydrogenated substance (C), and extruding to obtain the composition of the present disclosure. It can have. 【0080】 Furthermore, the amount of ethylene-α-olefin copolymer (B) contained in the resulting thermoplastic elastomer composition is 10 to 180 parts by mass per 100 parts by mass of olefin resin (A). The amount of hydrogenated substance (C) contained in the resulting thermoplastic elastomer composition is 170 to 500 parts by mass per 100 parts by mass of olefin resin (A). 【0081】 Furthermore, during the dynamic crosslinking reaction, the crosslinking agent (F) may be added from the beginning along with the olefin resin (A) and the ethylene-α-olefin copolymer (B), or it may be added midway through the extruder. The softening agent (D) may also be added midway through the extruder, or it may be added in two stages: initially and midway through. A portion of the olefin resin (A) and the ethylene-α-olefin copolymer (B) may also be added midway through the extruder. Here, the degree of crosslinking is controlled by the type and amount of crosslinking initiator and crosslinking aid added, the reaction temperature, and the reaction method. 【0082】 In the manufacturing method according to this disclosure, general equipment such as Banbury mixers, kneaders, single-screw extruders, and twin-screw extruders, which are commonly used in the manufacture of ordinary resin compositions and rubber compositions, can be employed. In particular, a twin-screw extruder is preferably used to efficiently achieve dynamic crosslinking. A twin-screw extruder is more suitable for uniformly and finely dispersing an olefin resin (A) and an ethylene-α-olefin copolymer (B), and then adding other components to induce a crosslinking reaction and continuously manufacture the composition according to this disclosure. 【0083】 <First step> The first step is to manufacture the first composition by melt-kneading the above-mentioned components (A), (B), and (F), as well as optional components (G), (C), (D), (E), and / or other additives, in the predetermined blending amounts described above. 【0084】 The first step, melt mixing, is preferably carried out in a closed-type apparatus and preferably under an inert gas atmosphere such as nitrogen or carbon dioxide. The melt mixing temperature is in the range of 300°C from the melting point of component (A), and is usually 150 to 270°C, preferably 160 to 250°C. The mixing time is usually 1 to 20 minutes, preferably 1 to 10 minutes. The applied shear force is usually 10 to 50,000 s in terms of shear rate. -1 Preferably 100 to 10,000 seconds -1 It is within the range. 【0085】 <Second process> The second step is a method for producing a thermoplastic elastomer by melt-kneading a second composition obtained by mixing component (C) and optional components such as component (A), component (B), component (D), component (E), component (F), component (G), and / or other additives in the predetermined amounts described above, with the first composition obtained in the first step. Furthermore, components other than those mentioned above, such as component (D) and component (E), which may be included in the thermoplastic elastomer of this disclosure, may be blended in the second step or in the first step. 【0086】 Another embodiment of the method for producing a thermoplastic elastomer according to the present disclosure is a method comprising the steps of producing a first composition in the first step, a step different from the second step, in which component (C) is mixed in a predetermined amount as described above, or mixed and then melt-kneaded to produce a second composition, and then a third step of melt-kneading the first composition produced in the first step and the second composition produced in the second step. 【0087】 The melting and kneading in the second step may be carried out under the same conditions as in the first step described above. Furthermore, components other than those mentioned above, such as component (D) and component (E), which may be included in the thermoplastic elastomer of this disclosure, may be blended in the third step, the second step, or the first step. 【0088】 Molded body The molded articles relating to this disclosure are not particularly limited as long as they include the thermoplastic elastomer composition of this disclosure, and are molded using any known molding method depending on the application. Examples of molding methods include press molding, injection molding, extrusion molding, calendering, hollow molding, vacuum molding, and compression molding. From the viewpoint of productivity and the ability to easily form complex shapes, injection molded articles formed using injection molding are preferred. 【0089】 The thermoplastic elastomer composition disclosed herein is low hardness and flexible, has excellent scratch resistance, and is not particularly limited in its applications. For example, as a molded article, it is suitable for various known applications such as automotive parts, civil engineering and construction materials, electrical and electronic components, sanitary products, films and sheets, foams, and artificial leather. It is particularly suitable for use as an automotive part such as automotive interior parts and as a surface material such as artificial leather. 【0090】 <Automotive parts> Examples of automotive parts that can be used with the molded articles of this disclosure include weatherstrips, headliners, interior seats, bumper moldings, side moldings, air spoilers, air duct hoses, cup holders, handbrake grips, shift knob covers, seat adjustment knobs, flapper door seals, wire harness grommets, rack and pinion boots, suspension cover boots, glass guides, inner beltline seals, roof guides, trunk lid seals, molded quarter window gaskets, corner moldings, glass enclosures, hood seals, glass run channels, secondary seals, various gaskets, bumper parts, body panels, side shields, glass run channels, instrument panel surfaces, door surfaces, headliners, weatherstrip materials, hoses, steering wheels, boots, wire harness covers, seat adjuster covers, etc. Among these, the thermoplastic elastomer composition of this disclosure is particularly preferred because it can improve texture and feel. 【0091】 <Civil engineering / building materials supplies> Examples of civil engineering and construction materials that can be used with the molded articles relating to this disclosure include civil engineering materials and construction materials such as ground improvement sheets, water intake panels, and noise prevention walls, as well as various gaskets and sheets for civil engineering and construction, waterproofing materials, joint materials, and building window frames. Among these, the thermoplastic elastomer composition relating to this disclosure is particularly preferred because it can improve texture and feel. 【0092】 <Electrical and Electronic Components> Examples of electrical and electronic components that can be used in the molded articles relating to this disclosure include, for example, wire insulation materials, connectors, caps, plugs, and other electrical and electronic components. Among these, the thermoplastic elastomer composition relating to this disclosure is particularly preferred because it can improve texture and feel. 【0093】 <Household goods> Examples of lifestyle products to which the molded articles relating to this disclosure can be used include sports equipment such as sports shoe soles, ski boots, tennis rackets, ski bindings, and bat grips, as well as miscellaneous goods such as pen grips, toothbrush grips, hairbrushes, fashion belts, various caps, and shoe insoles. Among these, the thermoplastic elastomer composition relating to this disclosure is particularly preferred because it can improve texture and feel. 【0094】 <Film / Sheet> Examples of films and sheets that can be used in molded articles according to this disclosure include intravenous fluid bags, medical containers, automotive interior and exterior materials, beverage bottles, clothing cases, food packaging materials, food containers, retort containers, pipes, transparent substrates, sealants, and the like. Among these, the thermoplastic elastomer composition of this disclosure is particularly preferred because it can improve texture and feel. 【0095】 <Artificial leather> Examples of artificial leathers that can be used in molded articles according to this disclosure include chair upholstery, bags, school bags, sports shoes such as athletic shoes, marathon shoes, and running shoes, clothing such as jackets and coats, belts, sashes, ribbons, notebook covers, book covers, keychains, pen cases, wallets, business card holders, and pass cases. Among these, the thermoplastic elastomer composition of this disclosure is particularly preferred because it can improve the texture and feel of the leather. [Examples] 【0096】 The present disclosure will be described in more detail below based on examples, but the present disclosure is not limited to these examples. The following polymers were used in the examples and comparative examples. 【0097】 [Olefin resin (A)] As the olefin resin (A), a propylene homopolymer (homoPP) (trade name Sun Allomer® PL400A, manufactured by Sun Allomer Co., Ltd.) [A-1] with a melt flow rate (MFR): 2.0 g / 10 min at 230°C and a 2.16 kg load was used. 【0098】 [Ethylene-α-olefin copolymer (B)] As the ethylene-α-olefin copolymer (B), ethylene-1-octene copolymer (manufactured by Dow Chemical, trade name "Engage 8842") [B-1] was used. The copolymer had an ethylene content of 55% by mass and an octene content of 45% by mass. The MFR measured under conditions of temperature: 190°C and load: 2.16 kg was 1.0 g / 10 min. 【0099】 [Component (C)] As component (C), the hydrogenated styrene-based block copolymer shown below was used. (C-1) Hydrogenated styrene-butadiene block copolymer (manufactured by Asahi Kasei Corporation, SOE S1606 (registered trademark)) (C-2) Hydrogenated styrene-butadiene block copolymer (manufactured by Asahi Kasei Corporation, SOE S1605 (registered trademark)) (C-3) Hydrogenated styrene-butadiene block copolymer (manufactured by Asahi Kasei Corporation, ToughTec H1041 (registered trademark)) (C-4) Hydrogenated styrene-butadiene block copolymer (manufactured by Asahi Kasei Corporation, registered trademark ToughTec H1221) 【0100】 [Softener (D)] As a softening agent (D), paraffin-based oil (manufactured by Idemitsu Kosan Co., Ltd., product name "Diana Process Oil PW-100") [D-1] was used. 【0101】 [Polyorganosiloxane (E)] As the polyorganosiloxane (E), a masterbatch (manufactured by DuPont-Toray Specialty Materials, trade name "MB50-001") [E-1] consisting of 50% by mass of dimethylsiloxane and 50% by mass of polypropylene was used. 【0102】 [Crosslinking agent (F)] As the crosslinking agent (F), the organic peroxide: 2,5-dimethyl-2,5-bis(t-butylperoxy)hexane (manufactured by Nippon Oil & Fats Co., Ltd., trade name "Perhexa 25B") (F-1) was used. 【0103】 [Crosslinking agent (G)] Divinylbenzene (manufactured by Wako Pure Chemical Industries, Ltd.; hereinafter referred to as "DVB") (G-1) was used as a crosslinking aid (G). 【0104】 [Example 1] <Manufacturing of thermoplastic elastomer compositions> A twin-screw extruder (30mmφ, L / D=74; manufactured by Kobe Steel, "KTX-30") with an oil inlet in the center of the barrel was used as the extruder. A two-screw screw with mixing sections before and after the inlet was used as the screw. The thermoplastic elastomer composition was obtained by performing a total of two melt extrusions. (Hereafter, the first melt extrusion will be referred to as "1Pass," and the second melt extrusion as "2Pass.") 【0105】 (1) 1 Pass The components (A-1), (B-1), (F-1), and (G-1) listed in Table 1 were mixed together in the respective proportions (parts by mass) shown in Table 1. The mixture was then introduced into a twin-screw extruder (cylinder temperature 200°C) using a quantitative feeder and melt extrusion was performed to obtain the first composition. 【0106】 (2) 2Pass Components (C-1) and (E-1) were mixed together in the amounts (parts by mass) shown in Table 1 to obtain the second composition. This second composition was then mixed with the first composition obtained in the first pass and introduced into the same twin-screw extruder (cylinder temperature 200°C) using a quantitative feeder. Subsequently, component (D-1) in the amount shown in Table 1 was injected by pump through the inlet in the center of the twin-screw extruder, and melt extrusion was performed to produce a thermoplastic elastomer composition. 【0107】 <Manufacturing of injection-molded products> The thermoplastic elastomer composition obtained in the above process was injection molded using an injection molding machine [M150CL-DM manufactured by Meiki Seisakusho Co., Ltd.] under molding conditions of resin temperature 220°C and mold temperature 40°C, using a flat mold measuring 15cm in length and 9cm in width with a textured finish, to create an injection molded sample. The physical properties of the obtained thermoplastic elastomer compositions and injection-molded articles were evaluated by the following method. The results are shown in Table 1. 【0108】 (1) MFR (g / 10 min) The melt flow rate of the thermoplastic elastomer composition obtained above was measured in accordance with JIS K7120 under conditions of 230°C and a 2.16 kg load. 【0109】 (2) Shore A hardness measurement A 2 mm thick press sheet was prepared from a thermoplastic elastomer composition, and a 6 mm thick laminated sheet obtained by stacking three of these press sheets was used as the measurement sample. The above-mentioned sample was measured using a Shore A hardness tester in accordance with JIS K6253. After the pressure plate was brought into contact with the test piece, the value read after 10 seconds was defined as the Shore A hardness (10-second value). 【0110】 (3) Gel content measurement The mass (W2) of the thermoplastic elastomer composition was measured and added to 20 mL of ODCB, then heated at 145°C for 2 hours to dissolve it. Thermal filtration was performed using a membrane filter, the residue on the filter was dried, and the mass (W3) of the dried residue was measured. The gel content W1 was calculated using the following formula. Gel content W1 (mass%) = (W3 / W2) × 100 【0111】 (4) Scratch resistance A pencil-type scratch hardness tester (Erichsen 318 / 318S No.2) was used to create 10 scratches each in the longitudinal and transverse directions on the textured surface of an injection-molded part under a load of 10N. The scratches in the central grid area were visually observed and evaluated. The evaluation was performed according to the following criteria. 5: There is almost no visible change in appearance due to the damage. 4: Slight changes in appearance due to scratches are observed. 3: Changes in appearance due to damage are observed. 2: Significant changes in appearance due to scratches are noticeable. 1: The appearance has changed significantly due to scratches. 【0112】 (5) Appearance (Gloss) Evaluation The gloss of the textured surface of the injection-molded product was evaluated by visual inspection. The evaluation was performed according to the following criteria. ○: Low gloss, excellent appearance. ×: High gloss, inferior appearance. 【0113】 [Examples 2-5, Comparative Examples 1-4] Except for changing each component and its proportion to those shown in Table 1, the procedure was carried out in the same manner as in Example 1 to obtain a thermoplastic elastomer composition and an injection-molded article. The physical properties of the obtained thermoplastic elastomer composition and injection-molded articles were evaluated using the method described above. The results are shown in Table 1. 【0114】 [Table 1] In Comparative Example 2, the "-" in gel content W1 and W1 / W0 indicates that the measurement was not performed. 【0115】 <Evaluation Results> As shown in Table 1, the injection-molded articles obtained from the thermoplastic elastomer compositions of Examples 1 to 5 exhibit excellent scratch resistance and appearance. On the other hand, the injection-molded articles obtained from the thermoplastic elastomer compositions of Comparative Examples 1, 2, and 3 did not exhibit good scratch resistance. The injection-molded article obtained from the thermoplastic elastomer composition of Comparative Example 4 did not exhibit a superior appearance.

Claims

[Claim 1] A thermoplastic elastomer composition comprising the following first composition and the following second composition, The thermoplastic elastomer composition contains 80 to 180 parts by mass of ethylene-α-olefin copolymer (B) per 100 parts by mass of olefin resin (A). The hydrogenated block copolymer (C) contained in the thermoplastic elastomer composition, which has at least one block mainly composed of conjugated diene monomer units and at least one block mainly composed of vinyl aromatic monomer units, is 170 to 500 parts by mass per 100 parts by mass of olefin resin (A). The sum of the content of the ethylene-α-olefin copolymer (B) and the content of the hydrogenated substance (C) in the thermoplastic elastomer composition is W. 0 (mass%), gel content W 1 (As mass%) Ratio W 1 / W 0 A thermoplastic elastomer composition characterized by having a value of 0.20 to 0.50; [First composition] A composition comprising an olefin resin (A), an ethylene-α-olefin copolymer (B), and a crosslinking agent (F), wherein the olefin resin (A) is a propylene polymer, and the ethylene-α-olefin copolymer (B) contains 70 to 99 mol% of units derived from ethylene. [Second composition] A composition containing a hydrogenated block copolymer (C) having at least one block mainly composed of conjugated diene monomer units and at least one block mainly composed of vinyl aromatic monomer units, characterized in that the amount of hydrogenated block copolymer (C) contained in the second composition is 30 parts by mass or more per 100 parts by mass of olefin resin (A) contained in the thermoplastic elastomer composition. [Claim 2] The thermoplastic elastomer composition according to claim 1, wherein the hydrogenated substance (C) is a styrene-based block copolymer. [Claim 3] The thermoplastic elastomer composition according to claim 1 or 2, wherein the amount of hydrogenated substance (C) contained in the thermoplastic elastomer composition is 180 to 250 parts by mass per 100 parts by mass of the olefin resin (A). [Claim 4] A step of producing the first composition by melt-kneading the olefin resin (A), the ethylene-α-olefin copolymer (B), and the crosslinking agent (F), A step of melting and kneading the first composition and the second composition. A method for producing a thermoplastic elastomer composition, comprising: [Claim 5] Having either (i) or (ii) below, (i) A step of dynamically crosslinking an olefin resin (A) and an ethylene-α-olefin copolymer (B) using a crosslinking agent (F), then adding a hydrogenated substance (C) downstream of the same extruder and melt-kneading the mixture, and then removing the thermoplastic elastomer composition from the extruder. (ii) A step of dynamically crosslinking an olefin resin (A) and an ethylene-α-olefin copolymer (B) using a crosslinking agent (F), removing the crosslinked body from the extruder after the crosslinking reaction is complete, remelting the crosslinked body and a hydrogenated substance (C), and extruding to obtain a thermoplastic elastomer composition. The olefin resin (A) is a propylene polymer, and the ethylene-α-olefin copolymer (B) contains 70 to 99 mol% of units derived from ethylene. The amount of the ethylene-α-olefin copolymer (B) contained in the thermoplastic elastomer composition is 80 to 180 parts by mass per 100 parts by mass of the olefin resin (A). The amount of the hydrogenated substance (C) contained in the thermoplastic elastomer composition is 170 to 500 parts by mass per 100 parts by mass of the olefin resin (A), The sum of the content of the ethylene-α-olefin copolymer (B) and the content of the hydrogenated substance (C) in the thermoplastic elastomer composition is W. 0 (mass%), gel content W 1 (As mass%) Ratio W 1 / W 0 A method for producing a thermoplastic elastomer composition, characterized in that the value of is 0.20 to 0.

50. [Claim 6] An instrument panel surface comprising the thermoplastic elastomer composition described in claim 1.

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