Method for producing thermoplastic elastomer composition for weather strip material

Abstract

To provide a thermoplastic elastomer composition for a weather strip material for obtaining a molding which is excellent in adhesion to both a thermoplastic elastomer adherend and a crystalline ethylenic resin adherend and is also excellent in heat resistance in a fused part.SOLUTION: A thermoplastic elastomer composition for a weather strip material has an ethylene-α-olefinic copolymer rubber (A), an α-olefinic crystalline thermoplastic resin (B), an olefinic block copolymer (C) which is obtained by hydrogeneration of a block copolymer having conjugated diene polymer blocks (c1) having 1,2-vinyl bond contents of 25 mol% or less at both terminals and a conjugated diene polymer block (c2) having a 1,2-vinyl bond content of more than 25 mol% in an intermediate part, and a crystalline ethylenic resin (D).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a thermoplastic elastomer composition for weatherstrip materials and a weatherstrip using a molded article made of said composition. [Background technology]

[0002] Thermoplastic elastomers (TPEs) are used in various fields such as automobiles, home appliances, medicine, food, electric wires, and daily necessities. In the automobile field in particular, thermoplastic elastomers have attracted attention as an alternative material to vulcanized rubber, mainly from the viewpoints of productivity, low cost, freedom of design, weight reduction, and recyclability.

[0003] In particular, there is a trend for vulcanized rubber to be replaced by thermoplastic elastomers in weather strips, which are one type of automotive part. For example, Patent Document 1 discloses a weather strip made of a thermoplastic elastomer composition containing an olefin-based rubber, a hydrogenated block copolymer, and a polyolefin-based resin other than the olefin-based rubber. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-113614 A Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, with the diversification of automobile designs, there is an increasing need for composite members in which a molded body made of a thermoplastic elastomer composition and a molded body made of a crystalline ethylene-based resin are melt-bonded together in the design of weather strips. However, although conventional thermoplastic elastomer compositions have excellent adhesion to molded bodies made of thermoplastic elastomer compositions, their adhesion to molded bodies made of crystalline ethylene-based resins is not sufficient. In particular, there is a problem in that the heat resistance of the fusion joint between the molded body made of the thermoplastic elastomer composition and the molded body made of the crystalline ethylene-based resin is insufficient, and the fusion joint is easily destroyed by heating.

[0006] Some aspects of the present invention provide a thermoplastic elastomer composition for weather strip material for obtaining a molded article (composite member) having excellent adhesion to both a thermoplastic elastomer adherend and a crystalline ethylene-based resin adherend and also having excellent heat resistance at the fused portion. Also, some aspects of the present invention provide a weather strip using a molded article made of the composition. [Means for solving the problem]

[0007] One embodiment of the thermoplastic elastomer composition for weather strip material according to the present invention is An ethylene-α-olefin copolymer rubber (A), an α-olefin-based crystalline thermoplastic resin (B); an olefin block copolymer (C) which is a hydrogenated product of a block copolymer having conjugated diene polymer blocks (c1) at both ends having a 1,2-vinyl bond content of 25 mol % or less and a conjugated diene polymer block (c2) in the middle having a 1,2-vinyl bond content of more than 25 mol %; A crystalline ethylene-based resin (D); Contains:

[0008] In one embodiment of the thermoplastic elastomer composition for weather strip material, When the total mass of the thermoplastic elastomer composition is 100 parts by mass, The content ratio of the component (A) may be 10 to 50 parts by mass, the content ratio of the component (B) may be 1 to 15 parts by mass, the content ratio of the component (C) may be 4 to 50 parts by mass, and the content ratio of the component (D) may be 10 to 50 parts by mass.

[0009] In any one of the embodiments of the thermoplastic elastomer composition for weather strip material, The melting point of the component (B) may be 135° C. or higher.

[0010] In any one of the embodiments of the thermoplastic elastomer composition for weather strip material, When the total amount of the conjugated diene polymer block (c1) and the conjugated diene polymer block (c2) contained in the component (C) is taken as 100 parts by mass, the content of the conjugated diene polymer block (c1) may be 5 to 90 parts by mass.

[0011] In any one of the embodiments of the thermoplastic elastomer composition for weather strip material, The component (D) may contain polyethylene (D1) having a weight average molecular weight of 1,000 to 30,000.

[0012] One aspect of the weather strip according to the present invention is The weather strip material is formed using a molded article made of the thermoplastic elastomer composition for weather strip material according to any one of the above embodiments.

[0013] In one embodiment of the weather strip, The molded article may be used for at least one of a corner material and an end material. Effect of the Invention

[0014] The thermoplastic elastomer composition of the present invention makes it possible to produce a molded article (composite material) that has excellent adhesion to both thermoplastic elastomer adherends and crystalline ethylene-based resin adherends, and also has excellent heat resistance at the fused joints. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Preferred embodiments of the present invention will be described in detail below. Note that the present invention is not limited to the embodiments described below, and should be understood to include various modified examples that are implemented within the scope of the present invention.

[0016] In this specification, a numerical range described as "X to Y" is interpreted as including the numerical value X as the lower limit and including the numerical value Y as the upper limit.

[0017] In this specification, the ethylene-α-olefin copolymer rubber (A) may be abbreviated as "component (A)", the α-olefin crystalline thermoplastic resin (B) as "component (B)", the olefin block copolymer (C) which is a hydrogenated product of a block copolymer having conjugated diene polymer blocks (c1) having a 1,2-vinyl bond content of 25 mol % or less at both ends and a conjugated diene polymer block (c2) having a 1,2-vinyl bond content of more than 25 mol % in the middle as "component (C)", and the crystalline ethylene resin (D) as "component (D)".

[0018] 1. Thermoplastic elastomer composition for weather strip materials The thermoplastic elastomer composition for weather strip material according to one embodiment of the present invention (hereinafter, also simply referred to as "thermoplastic elastomer composition") has the following properties: An ethylene-α-olefin copolymer rubber (A), an α-olefin-based crystalline thermoplastic resin (B); an olefin block copolymer (C) which is a hydrogenated product of a block copolymer having conjugated diene polymer blocks (c1) at both ends having a 1,2-vinyl bond content of 25 mol % or less and a conjugated diene polymer block (c2) in the middle having a 1,2-vinyl bond content of more than 25 mol %; A crystalline ethylene-based resin (D); Contains: Hereinafter, each component contained in the thermoplastic elastomer composition according to this embodiment will be described.

[0019] 1.1. Component (A) The thermoplastic elastomer composition according to the present embodiment contains an ethylene-α-olefin copolymer rubber (A). Component (A) is a copolymer rubber containing repeating units derived from ethylene and repeating units derived from an α-olefin. Component (A) may contain repeating units derived from a monomer other than ethylene and an α-olefin. Component (A) may be any of a random copolymer, an alternating copolymer, and a block copolymer, but is preferably a random copolymer.

[0020] The α-olefin is preferably an α-olefin having 3 to 10 carbon atoms, more preferably an α-olefin having 3 to 8 carbon atoms. Specific examples of the α-olefin include propylene, 1-butene, 2-methylpropene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, etc. In synthesizing component (A), these α-olefins may be used alone or in combination of two or more.

[0021] Examples of monomers other than ethylene and α-olefins include conjugated diene compounds having 4 to 8 carbon atoms, such as 1,3-butadiene, 2-methyl-1,3-butadiene, 1,3-pentadiene, and 2,3-dimethyl-1,3-butadiene; non-conjugated diene compounds having 5 to 15 carbon atoms, such as dicyclopentadiene, 5-ethylidene-2-norbornene, 1,4-hexadiene, 1,5-dicyclooctadiene, 7-methyl-1,6-octadiene, and 5-vinyl-2-norbornene; vinyl carboxylate esters, such as vinyl acetate; unsaturated carboxylate esters, such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, and ethyl methacrylate; and unsaturated carboxylic acids, such as acrylic acid and methacrylic acid. Among these, non-conjugated dienes having 5 to 15 carbon atoms are preferred, and 5-ethylidene-2-norbornene and dicyclopentadiene are more preferred. In synthesizing the component (A), these monomers other than ethylene and α-olefins may be used alone or in combination of two or more.

[0022] When the total mass of component (A) is taken as 100 mass%, the content of repeating units derived from ethylene in component (A) is preferably 40 to 85 mass%, more preferably 50 to 80 mass%, and particularly preferably 55 to 70 mass%.

[0023] When the total mass of component (A) is taken as 100 mass%, the content of repeating units derived from α-olefin in component (A) is preferably 10 to 50 mass%, more preferably 15 to 45 mass%, and particularly preferably 25 to 40 mass%.

[0024] When the total mass of component (A) is taken as 100 mass%, the content of repeating units derived from monomers other than ethylene and α-olefin in component (A) is preferably 0 to 15 mass%, more preferably 0 to 8 mass%, and particularly preferably 0 to 5 mass%.

[0025] The content ratio of the repeating units derived from each monomer in component (A) can be determined by infrared spectroscopy. Specifically, the infrared absorption spectrum of component (A) is measured using an infrared spectrophotometer, and the content ratio of the repeating units derived from each monomer in component (A) can be calculated according to the method described in "Characterization of Polyethylene by Infrared Absorption Spectroscopy (Takayama, Usami, et al.)" or "Die Makromolekulare Chemie, 177, 461 (1976) (McRae, MA, Madam S, WF, et al.)".

[0026] Specific examples of component (A) include ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, ethylene-propylene-1-butene copolymer, ethylene-propylene-1-hexene copolymer, ethylene-propylene-1-octene copolymer, ethylene-propylene-5-ethylidene-2-norbornene copolymer, ethylene-propylene-dicyclopentadiene copolymer, ethylene-propylene-1,4-hexadiene copolymer, ethylene-propylene-5-vinyl-2-norbornene copolymer, etc. Among these, ethylene-propylene copolymer and ethylene-propylene-5-ethylidene-2-norbornene copolymer are preferred. These components (A) may be used alone or in combination of two or more.

[0027] An example of the production method of component (A) is a method of copolymerizing ethylene, an α-olefin, and a monomer other than ethylene and an α-olefin in the presence of a known complex catalyst such as a Ziegler-Natta catalyst, a metallocene complex, a nonmetallocene complex, etc. Examples of the polymerization method include a slurry polymerization method, a solution polymerization method, a bulk polymerization method, a gas phase polymerization method, etc.

[0028] When the total mass of the thermoplastic elastomer composition is 100 parts by mass, the content of component (A) is preferably 10 to 50 parts by mass, more preferably 12 to 45 parts by mass, and particularly preferably 15 to 40 parts by mass.

[0029] 1.2.Component (B) The thermoplastic elastomer composition according to the present embodiment contains an α-olefin-based crystalline thermoplastic resin (B). Component (B) is a crystalline thermoplastic resin containing a repeating unit derived from an α-olefin. Component (B) may contain a repeating unit derived from ethylene.

[0030] The α-olefin is preferably an α-olefin having 3 to 20 carbon atoms. Specific examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 2-methylpropene, 1-pentene, 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, 2-ethyl-1-hexene, and 2,2,4-trimethyl-1-pentene. In synthesizing component (B), these α-olefins may be used alone or in combination of two or more.

[0031] The content of the repeating units derived from each monomer in component (B) can be determined in the same manner as for the content of each monomer unit in component (A).

[0032] Examples of the component (B) include a propylene homopolymer and a propylene random copolymer.

[0033] Examples of propylene random copolymers include: (1) A propylene-ethylene random copolymer containing a repeating unit derived from propylene and a repeating unit derived from ethylene. (2) A propylene-ethylene-α-olefin random copolymer containing a repeating unit derived from propylene, a repeating unit derived from ethylene, and a repeating unit derived from an α-olefin having 4 to 20 carbon atoms. (3) A propylene-α-olefin random copolymer containing a repeating unit derived from propylene and a repeating unit derived from an α-olefin having 4 to 20 carbon atoms. etc.

[0034] Examples of methods for producing propylene homopolymers and propylene random copolymers include methods for polymerizing propylene and the like in the presence of known complex catalysts such as Ziegler-Natta catalysts, metallocene complexes, nonmetallocene complexes, etc. Examples of the polymerization methods include slurry polymerization, solution polymerization, bulk polymerization, and gas phase polymerization.

[0035] The melting point of component (B) is preferably 135° C. or higher, more preferably 145° C. or higher, and particularly preferably 150° C. or higher. When component (B) has a melting point of 135° C. or higher, heat resistance can be imparted to the obtained molded article, and in particular, the heat resistance of the fused portion with other molded articles can be improved.

[0036] The melt flow rate of component (B), measured in accordance with JIS K7210 under conditions of a temperature of 230°C and a load of 21.2 N, is preferably 0.1 to 50 g / 10 min, more preferably 0.1 to 25 g / 10 min, and particularly preferably 0.1 to 15 g / 10 min, from the viewpoint of obtaining good adhesion to both thermoplastic elastomer adherends and crystalline ethylene resin adherends.

[0037] The density of component (B) measured in accordance with JIS K7112 is not particularly limited, but is preferably 0.85 g / cm 3 More than 0.95g / cm 3 More preferably, it is 0.87 g / cm or less. 3 More than 0.93g / cm 3 The following is the result.

[0038] When the total mass of the thermoplastic elastomer composition is 100 parts by mass, the content of component (B) is preferably 1 to 15 parts by mass, more preferably 2 to 10 parts by mass, and particularly preferably 3 to 8 parts by mass.

[0039] 1.3.Component (C) The thermoplastic elastomer composition according to the present embodiment contains an olefin block copolymer (C) obtained by hydrogenating a block copolymer having a conjugated diene polymer block (c1) (hereinafter also referred to as "block (c1)") having a 1,2-vinyl bond content of 25 mol% or less at both ends and a conjugated diene polymer block (c2) (hereinafter also referred to as "block (c2)") having a 1,2-vinyl bond content of more than 25 mol% in the middle. Here, the block (c1) and the block (c2) are blocks before hydrogenation. It has been revealed that the thermoplastic elastomer composition according to the present embodiment, particularly by using the component (C) and the component (D) in combination, enables the production of a molded article (composite member) having both good adhesion to a thermoplastic elastomer adherend and good adhesion to a crystalline ethylene resin adherend.

[0040] In this specification, the term "1,2-vinyl bond content" refers to the content of 1,2-vinyl bonds among cis-1,4-bonds, trans-1,4-bonds, and 1,2-vinyl bonds, calculated by the Morello method using infrared absorption spectroscopy. The bond content refers to the 1,2-vinyl bond content of the polymer before hydrogenation.

[0041] The block (c1) is preferably a polymer block mainly composed of 1,3-butadiene. Here, "mainly composed of 1,3-butadiene" means that 90% by mass or more, preferably 95% by mass or more of all repeating units of the block (c1) are repeating units derived from 1,3-butadiene. From the viewpoint of suppressing a drop in the melting point of the crystals after hydrogenation and maintaining mechanical strength, the 1,2-vinyl bond content of the block (c1) is 25 mol% or less, preferably 20 mol% or less, and more preferably 15 mol% or less.

[0042] The number average molecular weight (Mn) of the block (c1) is preferably 25,000 to 650,000, more preferably 50,000 to 450,000. When the number average molecular weight (Mn) is 25,000 or more, the mechanical properties tend to be improved. When the number average molecular weight (Mn) is 650,000 or less, the processability tends to be improved. Note that the component (C) has the block (c1) at both ends, and the number average molecular weight (Mn) of the block (c1) means the sum of the number average molecular weights (Mn) of the blocks (c1) at both ends.

[0043] The block (c2) is a conjugated diene polymer block having a structural unit derived from a conjugated diene compound. Examples of the conjugated diene compound include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 1,3-hexadiene, 4,5-diethyl-1,3-octadiene, 3-butyl-1,3-octadiene, and chloroprene. Among these, 1,3-butadiene, isoprene, and 1,3-pentadiene are preferred, and 1,3-butadiene is more preferred. The block (c2) may be composed of two or more types of monomer units.

[0044] The 1,2-vinyl bond content of the block (c2) is more than 25 mol%, preferably more than 25 mol% to 95 mol%, more preferably more than 25 mol% to 85 mol%. From the viewpoint of maintaining the flexibility of the component (C), the 1,2-vinyl bond content of the block (c2) is preferably more than 25 mol%.

[0045] The number average molecular weight (Mn) of the block (c2) is preferably 5,000 to 650,000, more preferably 20,000 to 550,000. When the number average molecular weight (Mn) is 5,000 or more, the mechanical properties tend to be improved. When the number average molecular weight (Mn) is 650,000 or less, the processability tends to be improved.

[0046] The block (c2) in the molecular structure of the component (C) may contain an aromatic vinyl polymer block. When the block (c2) contains an aromatic vinyl polymer block, the content of the aromatic vinyl polymer block is preferably 35% by mass or less, more preferably 30% by mass or less, and particularly preferably 25% by mass or less, from the viewpoint of maintaining low-temperature properties and flexibility, when the total repeating units of the block (c2) are taken as 100% by mass.

[0047] Examples of aromatic vinyl compounds that form the repeating unit of block (c2) in the molecular structure of component (C) include styrene, tert-butylstyrene, α-methylstyrene, p-methylstyrene, p-ethylstyrene, divinylbenzene, 1,1-diphenylstyrene, vinylnaphthalene, vinylanthracene, N,N-diethyl-p-aminoethylstyrene, vinylpyridine, etc. Among these, styrene is preferred.

[0048] When the total amount of the blocks (c1) and (c2) contained in the component (C) is taken as 100 parts by mass, the content of the block (c1) is preferably 5 to 90 parts by mass, and more preferably The content of block (c1) is preferably 10 to 80 parts by mass. When the content of block (c1) is 5 parts by mass or more, component (C) can easily exhibit relatively sufficient crystallinity compared to component (A), and the thermoplastic elastomer composition according to this embodiment tends to easily form a three-dimensional network structure not based on chemical crosslinking. On the other hand, when the content of block (c1) is 90 parts by mass or less, an excessive increase in hardness can be avoided. In this specification, the term "three-dimensional network structure" refers to a network structure formed in three dimensions by bonding the thermoplastic elastomer composition according to this embodiment without chemical crosslinking.

[0049] The olefin block copolymer before hydrogenation can be obtained by living anionic polymerization of an aromatic vinyl compound and a conjugated diene compound, or an aromatic vinyl compound and a conjugated diene compound and other monomers copolymerizable therewith, using an organic alkali metal compound as a polymerization initiator, in an inert organic solvent such as an aliphatic hydrocarbon solvent such as pentane, hexane, heptane, octane, etc.; an alicyclic hydrocarbon solvent such as cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane, etc.; an aromatic hydrocarbon solvent such as benzene, xylene, toluene, ethylbenzene, etc. Note that the component (C) can be easily obtained by hydrogenating the obtained olefin block copolymer before hydrogenation.

[0050] Examples of the organic alkali metal compound used as a polymerization initiator include an organic lithium compound and an organic sodium compound. Among these, organic lithium compounds such as n-butyl lithium, sec-butyl lithium, and tert-butyl lithium are preferred. The amount of the organic alkali metal compound used is not particularly limited, but is usually 0.02 to 5 parts by mass, preferably 0.03 to 1.5 parts by mass, based on 100 parts by mass of the monomer.

[0051] The polymerization temperature is usually -10 to 150°C, preferably 0 to 120°C. The atmosphere of the polymerization system is preferably replaced with an inert gas such as nitrogen gas. The polymerization pressure is not particularly limited as long as it is within a pressure range sufficient to maintain the monomer and the solvent in a liquid phase. The method of feeding the monomer into the polymerization system is not particularly limited, and examples thereof include a method of feeding the monomer all at once, continuously, intermittently, or a combination thereof.

[0052] The olefin block copolymer before hydrogenation may be a copolymer in which molecular chains of a plurality of copolymers are bonded via coupling residues. Such a copolymer can be prepared by using a coupling agent for the block copolymer obtained by the above-mentioned method.

[0053] Examples of coupling agents that can be used include divinylbenzene, 1,2,4-trivinylbenzene, epoxidized 1,2-polybutadiene, epoxidized soybean oil, epoxidized linseed oil, benzene-1,2,4-triisocyanate, dimethyl oxalate, diethyl phthalate, diethyl terephthalate, diethyl carbonate, 1,1,2,2-tetrachloroethane, 1,4-bis(trichloromethyl)benzene, trichlorosilane, methyltrichlorosilane, methyldichlorosilane, butyltrichlorosilane, tetrachlorosilane, dimethyldichlorosilane, (dichloromethyl)trichlorosilane, hexachlorodisilane, tetraethoxysilane, tetrachlorotin, and 1,3-dichloro-2-propanone.

[0054] Component (C) can be obtained by partially or selectively hydrogenating the olefin block copolymer obtained as described above before hydrogenation. The hydrogenation method and reaction conditions are not particularly limited, and are usually carried out at 20 to 150°C under a hydrogen pressure of 0.1 to 10 MPa in the presence of a hydrogenation catalyst.

[0055] The hydrogenation rate can be arbitrarily selected by changing the amount of hydrogenation catalyst, the hydrogen pressure during the hydrogenation reaction, the reaction time, etc. The hydrogenation catalyst is usually a compound containing any of the metals of Groups Ib, IVb, Vb, VIb, VIIb, and VIII of the Periodic Table, such as Ti, V, Compounds containing Co, Ni, Zr, Ru, Rh, Pd, Hf, Re, and Pt atoms can be used. Specifically, for example, metallocene compounds such as Ti, Zr, Hf, Co, Ni, Pd, Pt, Ru, Rh, and Re; supported heterogeneous catalysts in which metals such as Pd, Ni, Pt, Rh, and Ru are supported on simple substances such as carbon, silica, alumina, and diatomaceous earth; homogeneous Ziegler-type catalysts in which organic salts or acetylacetone salts of metal elements such as Ni and Co are combined with reducing agents such as organoaluminum; organometallic compounds or complexes such as Ru and Rh; and fullerenes and carbon nanotubes in which hydrogen is absorbed. Among them, metallocene compounds containing any of Ti, Zr, Hf, Co, and Ni are preferred in that they can be subjected to a hydrogenation reaction in an inert organic solvent in a homogeneous system. Furthermore, metallocene compounds containing any of Ti, Zr, and Hf are preferred. In particular, hydrogenation catalysts obtained by reacting a titanocene compound with an alkyl lithium are preferred because they are inexpensive and particularly useful industrially. The hydrogenation catalyst may be used alone or in combination of two or more. After hydrogenation, if necessary, the catalyst residue is removed, or a phenol-based or amine-based antiaging agent is added, and then component (C) is isolated. Component (C) can be isolated, for example, by a method of adding acetone or alcohol to a hydrogenated diene copolymer solution to cause precipitation, or by a method of pouring a hydrogenated diene copolymer solution into hot water under stirring and distilling off the solvent.

[0056] The hydrogenation rate of component (C) is preferably 80% or more, more preferably 90% or more, and particularly preferably 95 to 100%. When the hydrogenation rate is 80% or more, the thermal stability and durability tend to be improved.

[0057] The number average molecular weight (Mn) of component (C) is preferably 50,000 to 700,000, more preferably 100,000 to 600,000. When the number average molecular weight (Mn) is 50,000 or more, the heat resistance, strength, fluidity, and processability tend to be improved. When the number average molecular weight (Mn) is 700,000 or less, the fluidity, processability, and flexibility tend to be improved. Note that component (C) can be obtained, for example, by the method disclosed in JP-A-3-128957.

[0058] The melt flow rate of component (C), measured in accordance with JIS K7210 at a temperature of 230°C and a load of 21.2 N, is preferably 0.1 to 20 g / 10 min, more preferably 0.5 to 10 g / 10 min, and particularly preferably 1 to 5 g / 10 min, from the viewpoint of obtaining good adhesion to both thermoplastic elastomer adherends and crystalline ethylene resin adherends.

[0059] The density of component (C) measured in accordance with JIS K7112 is not particularly limited, but is preferably 0.85 g / cm 3 More than 0.95g / cm 3 More preferably, it is 0.86 g / cm or less. 3 More than 0.92g / cm 3 The following is the result.

[0060] A plurality of hydrogenated olefin block copolymers obtained as described above may be linked together via a coupling agent residue to be used as component (C). That is, component (C) is a copolymer of [(c1)-(c2)-(c1)]. n -X (wherein n is an integer of 3 or more, and X represents a coupling agent residue). Furthermore, as long as the molecular weight of the coupling agent residue is sufficiently small relative to the block (c1) and the block (c2) and does not affect the crystallinity of the component (C), the component (C) may be [(c1)-(c2)]. n -X (wherein n is an integer of 3 or more, and X represents a coupling agent residue).

[0061] Component (C) may also be a modified hydrogenated olefin block copolymer modified with a functional group. The functional group may be at least one selected from the group consisting of a carboxy group, an acid anhydride group, a hydroxyl group, an epoxy group, a halogen atom, an amino group, an isocyanate group, a sulfonyl group, a sulfonate group, and an oxazoline group. The method can be a known method. The content of the functional group in this modified hydrogenated olefin block copolymer is preferably 0.01 to 10 mol%, more preferably 0.1 to 8 mol%, and particularly preferably 0.15 to 5 mol%, when the total repeating units constituting the modified hydrogenated olefin block copolymer are 100 mol%. Preferred monomers that can be used to introduce the functional group include acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, glycidyl acrylate, glycidyl methacrylate, allyl glycidyl ether, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, and dimethylaminoethyl methacrylate.

[0062] When the total mass of the thermoplastic elastomer composition is 100 parts by mass, the content of component (C) is preferably 4 to 50 parts by mass, more preferably 5 to 40 parts by mass, and particularly preferably 6 to 30 parts by mass.

[0063] 1.4.Component (D) The thermoplastic elastomer composition according to the present embodiment contains a crystalline ethylene-based resin (D). Component (D) is a resin whose main repeating unit is ethylene. Component (D) may contain repeating units derived from monomers other than ethylene. It has become clear that the thermoplastic elastomer composition according to the present embodiment, particularly by using components (C) and (D) in combination, enables the production of a molded article (composite member) that has both good adhesion to a thermoplastic elastomer adherend and good adhesion to a crystalline ethylene-based resin adherend.

[0064] Examples of monomers other than ethylene include α-olefins having 3 to 10 carbon atoms; conjugated diene compounds having 4 to 8 carbon atoms, such as 1,3-butadiene, 2-methyl-1,3-butadiene, 1,3-pentadiene, and 2,3-dimethyl-1,3-butadiene; non-conjugated diene compounds having 5 to 15 carbon atoms, such as dicyclopentadiene, 5-ethylidene-2-norbornene, 1,4-hexadiene, 1,5-dicyclooctadiene, 7-methyl-1,6-octadiene, and 5-vinyl-2-norbornene; vinyl carboxylate esters, such as vinyl acetate; unsaturated carboxylate esters, such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, and ethyl methacrylate; and unsaturated carboxylic acids, such as acrylic acid and methacrylic acid.

[0065] Examples of component (D) include ethylene homopolymers and ethylene copolymers containing repeating units derived from ethylene and repeating units derived from monomers other than ethylene. Among the components (D), ethylene homopolymers, ethylene-propylene copolymers, ethylene-1-butene copolymers, ethylene-1-pentene copolymers, ethylene-4-methyl-1-pentene copolymers, and ethylene-1-hexene copolymers are preferred, and high-density polyethylene is more preferred.

[0066] It is also preferable to use polyethylene (D1) having a weight average molecular weight of 1,000 to 30,000 as part or all of component (D). The content of component (D1) in component (D) is preferably 20% by mass or more, and more preferably 40% by mass or more, when component (D) is taken as 100% by mass. On the other hand, the entire amount of component (D) may be component (D1), but the content of component (D1) in component (D) is preferably 80% by mass or less, and more preferably 60% by mass or less.

[0067] The melt flow rate of component (D), measured in accordance with JIS K7210 under conditions of a temperature of 190° C. and a load of 21.2 N, is preferably 0.01 to 200 g / 10 min, more preferably 0.01 to 200 g / 10 min, from the viewpoint of obtaining good adhesion to a molded article made of a crystalline ethylene-based resin. The rate is from 1 to 100 g / 10 minutes, and particularly preferably from 5 to 30 g / 10 minutes.

[0068] When component (D1) is used as all or part of component (D), the melt viscosity of component (D1) measured at a temperature of 140°C is preferably 10 to 30,000 mPa s, more preferably 30 to 25,000 mPa s, and particularly preferably 100 to 10,000 mPa s, from the viewpoint of obtaining very good adhesion to molded articles made of crystalline ethylene resins.

[0069] The density of component (D) measured in accordance with JIS K7112 is not particularly limited, but is preferably 0.91 g / cm 3 More than 0.97g / cm 3 More preferably, it is 0.94 g / cm or less. 3 More than 0.97g / cm 3 The following is the result.

[0070] Component (D) can be produced by polymerizing ethylene and, if necessary, a monomer other than ethylene in the presence of a polymerization catalyst such as a Ziegler-Natta catalyst, a metallocene catalyst, etc. Examples of the polymerization method include a solution polymerization method, a bulk polymerization method, a slurry polymerization method, a gas phase polymerization method, etc., and two or more of these may be combined.

[0071] When the total mass of the thermoplastic elastomer composition is 100 parts by mass, the content of component (D) is preferably 10 to 50 parts by mass, more preferably 12 to 45 parts by mass, and particularly preferably 15 to 40 parts by mass.

[0072] 1.5. Other Additives In addition to the above-mentioned components, additives such as a crosslinking agent, a crosslinking aid, an antiaging agent, a weather resistance agent, a fatty acid derivative, a silicone compound, a colorant (e.g., titanium oxide, carbon black, etc.), and an extender oil may be added to the thermoplastic elastomer composition according to the present embodiment as necessary.

[0073] <Crosslinking agents and crosslinking assistants> Examples of the crosslinking agent include organic peroxides, sulfur compounds, alkylphenol resins, etc. Among these, organic peroxides are preferred.

[0074] Examples of the organic peroxides include ketone peroxides, diacyl peroxides, hydroperoxides, dialkyl peroxides, peroxyketals, alkyl peresters, percarbonates, peroxydicarbonates, and peroxyesters. Specific examples of organic peroxides include dicumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne, 1,3-bis(tert-butylperoxyisopropyl)benzene, tert-butylcumyl peroxide, di-tert-butyl peroxide, 2,2,4-trimethylpentyl-2-hydroperoxide, diisopropylbenzohydroperoxide, cumene peroxide, tert-butyl peroxide, 1,1-di(tert-butylperoxy)3,5,5-trimethylcyclohexane, 1,1-di-tert-butylperoxycyclohexane, isobutyl peroxide, bis-3,5,5-trimethylhexanoyl peroxide, lauroyl peroxide, benzoyl peroxide, and p-chlorobenzoyl peroxide.

[0075] In order to increase the degree of crosslinking of the component (A), a crosslinking agent may be used in combination with a crosslinking assistant. Such a crosslinking assistant is preferably a compound having two or more double bonds. Specific examples of the crosslinking assistant include peroxides such as N,N'-m-phenylene bismaleimide, toluylene bismaleimide, p-quinone dioxime, nitrosobenzene, diphenyl guanidine, and trimethylolpropane; divinylbenzene, triallyl cyanurate, triallyl isocyanurate, ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, allyl methacrylate, etc.

[0076] <Anti-aging agent> By containing an antioxidant, the thermoplastic elastomer composition according to this embodiment can withstand molding at high temperatures due to the suppression of thermal decomposition, and the heat resistance may be improved in a fusion zone between a molded article obtained by molding the composition and another molded article.

[0077] Examples of the antiaging agent include hindered amine compounds, hydroquinone compounds, hindered phenol compounds, sulfur-containing compounds, phosphorus-containing compounds, naphthylamine compounds, diphenylamine compounds, p-phenylenediamine compounds, quinoline compounds, hydroquinone derivative compounds, monophenol compounds, bisphenol compounds, trisphenol compounds, polyphenol compounds, thiobisphenol compounds, hindered phenol compounds, phosphite compounds, imidazole compounds, nickel dithiocarbamate compounds, phosphoric acid compounds, etc. These antiaging agents may be used alone or in combination of two or more.

[0078] As the antioxidant, commercially available products may be used, for example, products under the trade names "ADK STAB AO-60", "ADK STAB 2112", and "ADK STAB AO-412S" manufactured by ADEKA Corporation.

[0079] <Fatty acid derivative> Examples of fatty acid derivatives include fatty acids, fatty acid esters, fatty acid amides, and fatty acid metal salts. Examples of fatty acids include linear saturated fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, arachic acid, behenic acid, lignoceric acid, cerotic acid, montanic acid, and melissic acid; unsaturated fatty acids such as cetoleic acid and sorbic acid; and aromatic carboxylic acids such as benzoic acid and phenylacetic acid. Examples of fatty acid esters include esters of higher fatty acids having 8 or more carbon atoms, such as stearyl stearate, lauryl stearate, stearyl palmitate, lauryl palmitate, glyceride tristearate, and glyceride tripalmitate. Examples of fatty acid amides include amides of saturated fatty acids such as lauric acid amide, myristic acid amide, palmitic acid amide, stearic acid amide, and behenic acid amide; and amides of unsaturated fatty acids such as oleic acid amide, linoleic acid amide, linolenic acid amide, erucic acid amide, arachidonic acid amide, eicosapentaenoic acid amide, and docosahexaenoic acid amide. Among fatty acid amides, unsaturated fatty acid amides are preferred, and erucic acid amide and oleic acid amide are more preferred. Examples of fatty acid metal salts include sodium salts, potassium salts, calcium salts, aluminum salts, and zinc salts of fatty acids having 10 to 25 carbon atoms.

[0080] 1.6. Method for producing thermoplastic elastomer composition Although not particularly limited, the thermoplastic elastomer composition according to the present embodiment is preferably produced by first melt-kneading components other than components (C) and (D) (i.e., components (A), (B), and other additives) to obtain a thermoplastic elastomer intermediate, and then melt-kneading components (C) and (D) to the thermoplastic elastomer intermediate. The raw material components are melt-kneaded by a melt-kneading method using a general mixer such as a Banbury mixer, a single-screw extruder, a twin-screw extruder, a kneader, a multi-screw extruder, or a roll.

[0081] 1.7. Uses of Thermoplastic Elastomer Compositions In recent years, with the diversification of automobile designs, the design of weather strips has become more and more complicated. There is an increasing need for a composite member in which a molded body made of a thermoplastic elastomer composition and a molded body made of a crystalline ethylene-based resin are melt-bonded together. Conventional thermoplastic elastomer compositions have excellent adhesion to molded bodies made of thermoplastic elastomer compositions, but their adhesion to molded bodies made of crystalline ethylene-based resins is insufficient. In particular, the heat resistance of the fusion zone between the molded body made of the thermoplastic elastomer composition and the molded body made of the crystalline ethylene-based resin is insufficient, and the fusion zone tends to be easily destroyed by heating.

[0082] In contrast, the thermoplastic elastomer composition according to the present embodiment can provide a molded article that has excellent adhesion to both thermoplastic elastomer adherends and crystalline ethylene-based resin adherends, and also has excellent heat resistance at the fused portion. Therefore, the thermoplastic elastomer composition according to the present embodiment is suitable for use as a material for producing weather strip materials.

[0083] 2. Weather stripping A weather strip according to one embodiment of the present invention uses a molded body made of the above thermoplastic elastomer composition. By using the above thermoplastic elastomer composition, a composite member in which a thermoplastic elastomer molded body and another molded body are bonded can be manufactured. Here, examples of the other molded body include a thermoplastic elastomer molded body and a crystalline ethylene resin molded body. The above composite member is not only excellent in weather resistance and cushioning properties, but also has excellent adhesion to other molded bodies and excellent heat resistance at the fusion joint, making it ideal for corner materials and terminal materials in particular.

[0084] The composite member can be produced by injection molding. Specifically, for example, the composite member can be produced by a method in which another molded body as described above is placed in a split mold for injection molding in advance, the thermoplastic elastomer composition is injected into the split mold by injection molding, and then cooled.

[0085] In this injection molding, a cylinder temperature of 200 to 270° C., an injection rate of 10 to 100 cc / sec, and a mold cooling temperature of 30 to 60° C. are preferred from the viewpoint of adhesion between the thermoplastic elastomer molded body and other molded bodies in the composite material.

[0086] 3. Working Example Specific examples of the present invention will be described below, but the present invention is not limited to these examples. In the following Production Examples, Examples, and Comparative Examples, "%" is based on mass unless otherwise specified.

[0087] 3.1. Production of thermoplastic elastomer composition The types and amounts of ethylene / α-olefin copolymer rubber (A), α-olefin crystalline thermoplastic resin (B), crosslinking agent, crosslinking aid, black pigment, antioxidant, weather resistance agent, higher fatty acid amide, polydimethylsiloxane A (kinetic viscosity 100 cSt), and polydimethylsiloxane B (kinetic viscosity 1000 cSt) shown in Table 1 below were melt-kneaded to produce a thermoplastic elastomer composition intermediate. Next, the types and amounts of the thermoplastic elastomer intermediate, the olefin block copolymer (C) or the olefin block copolymer (C'), the crystalline ethylene resin (D-1) and / or the crystalline ethylene resin (D-2) shown in Table 1 below were melt-kneaded to produce each of the thermoplastic elastomer compositions used in Examples 1 to 5 and Comparative Examples 1 to 3.

[0088] 3.2.Evaluation Methodology 3.2.1. Preparation of the substrate (1) Preparation of thermoplastic elastomer adherend Exxon Mobil's "Santoprene 121-73W175" was molded into a sheet measuring 120 mm x 120 mm x 2 mm using an injection molding machine (Japan Steel Works, Ltd., product name "J110ADS") This sheet was punched out with a dumbbell cutter to a length of 60 mm and a width of 50 mm, and this was used as a thermoplastic elastomer adherend.

[0089] (2) Preparation of crystalline ethylene-based resin substrate "Novatec HD HJ590N" manufactured by Japan Polyethylene Corporation was molded into a sheet measuring 120 mm x 120 mm x 2 mm using an injection molding machine (manufactured by Japan Steel Works, Ltd., product name "J110ADS") This sheet was punched out with a dumbbell cutter to a length of 60 mm and a width of 50 mm, and this was used as the crystalline ethylene resin adherend.

[0090] 3.2.2. Preparation of zygotes (1) Preparation of a joint with a thermoplastic elastomer adherend First, the thermoplastic elastomer adherend prepared above was attached in advance to the split mold of an injection molding machine (manufactured by Japan Steel Works, Ltd., product name "J110ADS"). Next, any one of the thermoplastic elastomer compositions prepared above was injection molded (injection temperature 260°C, mold cooling temperature 45°C) into the cutout portion (inside the split mold to which the thermoplastic elastomer adherend was attached) so as to fit into the cutout portion, and a flat plate (120mm x 120mm x 2mm (length x width x thickness)) was obtained in which the thermoplastic elastomer composition and the thermoplastic elastomer adherend were injection fused. Next, this flat plate was punched out with a JIS-2 dumbbell cutter to obtain a test piece (dumbbell-shaped test piece).

[0091] (2) Preparation of a joint with a crystalline ethylene-based resin adherend First, the crystalline ethylene-based resin adherend prepared above was attached in advance to the split mold of an injection molding machine (manufactured by Japan Steel Works, Ltd., product name "J110ADS"). Next, any one of the thermoplastic elastomer compositions prepared above was injection molded (injection temperature 260°C, mold cooling temperature 45°C) into the cutout portion (inside the split mold to which the crystalline ethylene-based resin adherend was attached) so as to fit into the cutout portion, and a flat plate (120mm x 120mm x 2mm (length x width x thickness)) was obtained in which the thermoplastic elastomer composition and the crystalline ethylene-based resin adherend were injection fused. Next, this flat plate was punched out with a JIS-2 dumbbell cutter to obtain a test piece (dumbbell-shaped test piece).

[0092] 3.2.3. Evaluation Test The test pieces prepared above were evaluated by carrying out the following tests. The results are shown in Table 1 below.

[0093] (1) Adhesiveness Each test piece prepared above was bent 180 degrees from the injection fused portion as the starting point, and evaluated according to the following criteria. (Evaluation Criteria) A: The fused part did not break even after 10 bendings, and the adhesion was very good. B: The fused portion was not broken after five bendings, and the adhesion was good. C: The fused portion was destroyed by bending once, and the adhesion was poor.

[0094] (2) Heat resistance The test pieces obtained above were hung with a load of 200 gf attached to one end in a thermostatic chamber adjusted to 85° C., and left to stand for 2 hours, 24 hours, and 48 hours, and then evaluated according to the following criteria. (Evaluation Criteria) A: The fused part did not break after being left to stand for 48 hours, and the heat resistance was very good. B: The fused part did not break down after being left standing for 24 hours, and heat resistance was good. C: The fused portion broke in less than 2 hours, and the heat resistance was poor.

[0095] 3.3.Evaluation Results Table 1 below shows the compositions of the thermoplastic elastomer compositions prepared in each of the Examples and Comparative Examples, as well as the evaluation results.

[0096] [Table 1]

[0097] The components used in the above Table 1 were as follows: Ethylene-α-olefin copolymer rubber (A): A mixture of 50% by mass of ethylene-propylene-5-ethylidene-2-norbornene terpolymer (ethylene unit content 66% by mass, 5-ethylidene-2-norbornene unit content 4.5% by mass, intrinsic viscosity 4.6) and paraffin-based softener (Diana Process Oil PW90, Idemitsu Kosan Co., Ltd.) α-Olefin crystalline thermoplastic resin (B-1): Product name "Novatec PP MA2", manufactured by Japan Polypropylene Corporation, propylene homopolymer, melting point 159°C, density 0.90g / cm 3 , Melt flow rate (230℃, load 21.2N) 16g / 10min α-Olefin crystalline thermoplastic resin (B-2): Product name "Novatec PP FL02A", manufactured by Japan Polypropylene Corporation, propylene random copolymer, melting point 139°C, density 0.90g / cm 3 , Melt flow rate (230℃, load 21.2N) 20g / 10min α-Olefin crystalline thermoplastic resin (B-3): Product name "Novatec PP FX4E", manufactured by Japan Polypropylene Corporation, propylene random copolymer, melting point 132°C, density 0.90g / cm 3 , Melt flow rate (230℃, load 21.2N) 5.3g / 10min Olefin block copolymer (C): Product name "DYNARON 6200P", manufactured by JSR Corporation, density 0.88 g / cm 3 A hydrogenated block copolymer obtained by hydrogenating a block copolymer having a melt flow rate (230°C, load 21.2N) of 2.5g / 10min, a conjugated diene polymer block having a 1,2-vinyl bond content of 25mol% or less at both ends, and a conjugated diene polymer block having a 1,2-vinyl bond content of more than 25mol% in the middle. Olefin block copolymer (C'): Trade name "INFUSE 9007", manufactured by Dow Chemical Company, density 0.87 g / cm 3 , Melt flow rate (230℃, load 21.2N) 0.5g / 10min, Ethylene-octene-1 copolymer Crystalline ethylene resin (D-1): Trade name "Novatec HD HJ490", manufactured by Japan Polyethylene Corporation, weight average molecular weight 120,000, melting point 131°C, density 0.96g / cm 3 , Melt flow rate (190℃, load 21.2N) 20g / 10min, Ethylene-propylene copolymer Crystalline ethylene resin (D-2): Trade name "LICOCENE PE 5301", Clariant, weight average molecular weight 4,800, melting point 129°C, polyethylene Crosslinking agent: Trade name "Perhexa 25B-40", NOF Corporation, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane Crosslinking agent: Trade name "Valnoc PM", manufactured by Ouchi Shinko Chemical Industry Co., Ltd., N,N'-m-phenylene bismaleimide Black pigment: A mixture of crystalline propylene resin and carbon black (carbon black content 40%) Anti-aging agent: Trade name "ADEKA STAB AO-60", manufactured by ADEKA Corporation, pentaerythritol tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] Weatherproofing agent: Trade name "ADEKA STAB LA-52", manufactured by ADEKA Corporation, tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)butane-1,2,3,4-tetracarboxylate Higher fatty acid amide: Trade name "Neutron-S", manufactured by Nippon Fine Chemicals Co., Ltd., erucic acid amide Polydimethylsiloxane A: Trade name "DOWSIL SH200 Fluid 100cSt", manufactured by Dow Toray, kinematic viscosity: 100cSt Polydimethylsiloxane B: Trade name "DOWSIL SH200 Fluid 1000cSt", manufactured by Dow Toray, kinematic viscosity: 1000cSt

[0098] From the evaluation results in Table 1 above, it was found that the thermoplastic elastomer compositions of Examples 1 to 5 provided joined bodies with excellent adhesion to both thermoplastic elastomer adherends and crystalline ethylene resin adherends, and also with excellent heat resistance at the fused joints. It was found that by using the thermoplastic elastomer composition in combination with component (D-1) and component (D-2) as the crystalline ethylene-based resin (D), a bonded product having superior adhesion to other molded bodies and superior heat resistance at the fused joints can be obtained.

[0099] The thermoplastic elastomer composition of Comparative Example 1 contains an olefin block copolymer (C') instead of component (C). Therefore, although it was bonded to a thermoplastic elastomer adherend and a crystalline ethylene resin adherend, the heat resistance was insufficient in both the fused portion with the thermoplastic elastomer adherend and the fused portion with the crystalline ethylene resin adherend.

[0100] The thermoplastic elastomer composition of Comparative Example 2 did not contain the component (C), and therefore the adhesion and heat resistance of the bonded body to the thermoplastic elastomer adherend were insufficient.

[0101] The thermoplastic elastomer composition of Comparative Example 3 did not contain the components (C) and (D), and therefore had insufficient adhesion and heat resistance in a bonded structure with a crystalline ethylene resin adherend.

[0102] The present invention is not limited to the above-described embodiments, and various modifications are possible. The present invention includes configurations that are substantially the same as those described in the embodiments (for example, configurations with the same functions, methods, and results, or configurations with the same purpose and effect). The present invention also includes configurations in which non-essential parts of the configurations described in the above-described embodiments are replaced with other configurations. Furthermore, the present invention also includes configurations that have the same effects as the configurations described in the above-described embodiments, or that can achieve the same purpose. Furthermore, the present invention also includes configurations in which publicly known technology is added to the configurations described in the above-described embodiments.

Claims

1. An ethylene-α-olefin copolymer rubber (A) and an α-olefin crystalline thermoplastic resin (B) are melt-kneaded to obtain a thermoplastic elastomer intermediate, and then The method for producing a thermoplastic elastomer composition for weather strip material further includes adding to the thermoplastic elastomer intermediate an olefin-based block copolymer (C) which is a hydrogenated product of a block copolymer having conjugated diene polymer blocks (c1) having a 1,2-vinyl bond content of 25 mol % or less at both ends and a conjugated diene polymer block (c2) having a 1,2-vinyl bond content of more than 25 mol % in the middle, and a crystalline ethylene-based resin (D), and melt-kneading the thermoplastic elastomer intermediate.

2. When the total mass of the thermoplastic elastomer composition is 100 parts by mass, 2. The method for producing a thermoplastic elastomer composition for weather strip material according to claim 1, wherein the content of said component (A) is 10 to 50 parts by mass, the content of said component (B) is 1 to 15 parts by mass, the content of said component (C) is 4 to 50 parts by mass, and the content of said component (D) is 10 to 50 parts by mass.

3. The method for producing a thermoplastic elastomer composition for weather strip material according to claim 1 or 2, wherein the melting point of the component (B) is 135°C or higher.

4. 4. The method for producing a thermoplastic elastomer composition for weather strip material according to claim 1, wherein a content ratio of the conjugated diene polymer block (c1) is 5 to 90 parts by mass, when a total amount of the conjugated diene polymer block (c1) and the conjugated diene polymer block (c2) contained in the component (C) is 100 parts by mass.

5. The method for producing a thermoplastic elastomer composition for weather strip material according to any one of claims 1 to 4, wherein the component (D) comprises polyethylene (D1) having a weight average molecular weight of 1,000 to 30,000.

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