JP2018044085A - Thermoplastic elastomer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have excellent low-temperature impact resistance, tensile properties and the like, and excellent thermoplasticity such as injection moldability required for use in an airbag storage cover and extrusion moldability required for use in automobile window parts or automobile interior skins. An elastomer composition is provided. A thermoplastic elastomer composition containing at least the following component (B) and the following compound (C). Component (B): Ethylene-based block copolymer compound containing a polymer block containing ethylene and an ethylene / α-olefin copolymer block (C): Peroxydicarbonate [Selection diagram] None

Description

  The present invention relates to a thermoplastic elastomer composition excellent in low-temperature impact resistance, tensile properties, moldability, and the like, and an injection molded article and an extrusion molded article using the thermoplastic elastomer composition. The injection molded article of the present invention is suitable as an airbag housing cover, and the extruded molded article of the present invention is suitable as a vehicle window peripheral part and an automobile interior skin.

  An automobile air bag system is a system that protects a driver and a passenger in the event of a collision of an automobile, etc., and a collision detection device that detects an impact at the time of a collision, and an air bag according to the detection of the collision of the collision detection device. And an airbag device that operates to inflate the bag. The airbag device is installed in a steering wheel, an instrument panel in front of a passenger seat, a driver seat and a passenger seat, front and side pillars, and the like.

  Various proposals have been made regarding the structure and material of the airbag storage cover in the airbag apparatus so that the airbag storage cover can be cleaved as designed in a wide temperature range from low temperature to high temperature.

  Conventionally, as a material for an airbag storage cover, for example, Patent Document 1 proposes a crosslinked polyolefin thermoplastic elastomer composition containing a propylene-based olefin resin and a crosslinking agent such as an organic peroxide. Patent Document 2 discloses that the component (A): a propylene-based polymer 100 parts by mass, the component (B): an olefin-based polymer block containing ethylene and an ethylene / α-olefin copolymer block. A thermoplastic elastomer composition containing 10 to 300 parts by mass of a block copolymer has been proposed.

  In Patent Document 1, there is no description of the peroxydicarbonate of the compound (C) used in the present invention as an example as a crosslinking agent, but in Patent Document 3, peroxydicarbonate is mixed with polypropylene, and this mixture A method has been proposed in which the melt strength of polypropylene is enhanced by heating.

International Publication WO2006 / 070179 International Publication WO2014 / 046139 Special table 2001-524565

In recent years, from the viewpoints of safety enhancement and design freedom, it has been desired to develop a material with further enhanced low-temperature impact resistance and tensile properties as a material for an airbag storage cover.
However, according to the detailed study of the present inventors, the conventional materials for airbag storage covers as described in Patent Documents 1 and 2 are insufficient in low-temperature impact resistance, tensile properties, and the like. It was found.

  The technical problem of the present invention is excellent in low temperature impact resistance, tensile properties, etc., injection molding required for use in airbag storage covers, and extrusion moldability required for use in parts around car windows or automobile interior skins. Another object of the present invention is to provide an excellent thermoplastic elastomer composition, and an injection-molded product and an extruded product using the thermoplastic elastomer composition.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have improved the low-temperature impact resistance and the like by crosslinking by blending a specific peroxydicarbonate as a crosslinking agent into the polyolefin-based thermoplastic elastomer composition. The present inventors have found that the above problems can be solved, and have reached the present invention. That is, the gist of the present invention resides in the following [1] to [11].

[1] A thermoplastic elastomer composition containing at least the following component (B) and the following compound (C).
Component (B): Olefin-based block copolymer compound containing ethylene-containing polymer block and ethylene / α-olefin copolymer block (C): peroxydicarbonate

[2] The thermoplastic elastomer composition according to [1], containing 0.01 to 10 parts by mass of the compound (C) with respect to 100 parts by mass of the component (B).

[3] The thermoplastic elastomer composition according to [1] or [2], further comprising a propylene-based polymer having a propylene unit content of 85 to 100% by mass as the component (A).

[4] The thermoplastic elastomer composition according to any one of [1] to [3], wherein the density of the component (B) is 0.880 g / cm ³ or less.

[5] The thermoplastic elastomer composition according to any one of [1] to [4], wherein the compound (C) is a compound represented by the following general formula (1).
R ¹ —OC (O) OOC (O) O—R ² (1)
(In General Formula (1), R ¹ and R ² are each independently a group selected from the following groups.
_{CH 3, 2-i-C} 3 H 7 O-C 6 H 4, C 2 H 5 CH (CH 3), 4-CH 3 -C 6 H 4, Cl 3 CC (CH 3) 2, C 7 H _{15, c-C 6 H 11} CH 2, 3-t-C 4 H 9 -C 6 H 5, Cl 3 Si (CH 2) 3, C 6 H 5, CH 3 CH (OCH 3) CH 2 CH 2 _{, C 6 H 5 OCH 2 CH} 2, C 6 H 5 CH 2, z-C 8 H 17 CH = CH (CH 2) 8, 2-CH 3 -C 6 H 4, (CH 3) 2 CHCH 2 CH (CH ₃ ), 3,4-di-CH ₃ —C ₆ H ₃ , Cl ₃ C, CHCH (Cl), ClCH ₂ , [C ₂ H ₅ OC (O)] ₂ CH (CH ₃ ), 3, _{5-di-CH 3 -C 6} H 3, C 8 H 17, C 2 H 5, C 18 H 37, 2- oxo-1,3 - Jiokusoran _{-4-CH 2, C 2 H} 5 CH (Cl) CH 2, 4-CH 3 O-C 6 H 4, i-C 4 H 9, CH 3 SO 2 CH 2 CH 2, C 12 H 25 _{, C 6 H 5 CH (Cl} ) CH 2, H 2 C = CHC (O) OCH 2 CH 2, 4-NO 2 -C 6 H 4, C 4 H 9, C 10 H 21, C 4 H 9 CH _{(C 2 H 5) CH 2} , H 2 C = CHCH 2, 2-Cl-c-C 6 H 10, H 2 C = C (CH 3) CH 2, c-C 6 H 11, ClCH 2 CH 2 _{, 4- [C 6 H 5 -N} = N] -C 6 H 4 CH 2, C 16 H 33, 1- _{naphthyl, 4-t-C 4 H} 9 -C 6 H 10, 2,4,5- _{tri-Cl-C 6 H 2} , Cl (CH 2) 3, C 14 H 29, 9- fluorenyl, _4-NO 2 -C _{6 H 4 CH 2, 2-} i-C 3 H 7 -C 6 H 4, CH 3 OCH 2 CH 2, H 2 C = C (CH 3), 3-CH 3 -C 6 H 4, BrCH 2 CH _{2, 3-CH 3 -5-} i-C 3 H 7 -C 6 H 3, Br 3 CCH 2, C 2 H 5 OCH 2 CH 2, 4-CH 3 OC (O) -C 6 H 4, H _{2 C = CH, i-C} 3 H 7, 2-C 2 H 5 CH (CH 3) -C 6 H 4, Cl 3 CCH 2, C 5 H 11, c-C 12 H 23, 4-t- _{C 4 H 9 -C 6 H 4} , C 6 H 13, C 3 H 7, CH 3 OCH 2 CH 2, C 6 H 13 CH (CH 3), CH 3 OC (CH 3) 2 CH 2 CH 2, _{C 3 H 7 OCH 2 CH 2} , CH 3 OCH 2 CH (CH 3), 2-i-C 3 H 7 -5-CH 3 - _{c-C 6 H 9, C} 4 H 9 CCH 2 CH 2, t-C 4 H 9, (CH 3) 3 CCH 2
Here, i = iso, t = tertiary, z = cis, and c = cyclic. C ₆ H ₅ , C ₆ H ₄ , C ₆ H ₃ , and C ₆ H ₂ are benzene rings. )

[6] The component (A) is any one of ethylene / propylene block copolymer, ethylene / propylene random copolymer, and polypropylene, or any one of [3] to [5]. The thermoplastic elastomer composition as described.

[7] The thermoplastic elastomer composition according to any one of [1] to [6], wherein the melt flow rate (230 ° C., 21.2N (ISO 1133)) is 0.1 to 150 g / 10 minutes.

[8] An injection molded article using the thermoplastic elastomer composition according to any one of [1] to [7].

[9] The injection-molded article according to [8], which is an airbag storage cover.

[10] An extruded product using the thermoplastic elastomer composition according to any one of [1] to [7].

[11] The extruded product according to [10], which is a car window part or an automobile interior skin.

The thermoplastic elastomer composition of the present invention is excellent in low-temperature impact resistance, tensile properties, etc., injection moldability required for use in airbag storage covers, extrusion required for use in car window parts or automobile interior skins. Excellent formability.
For this reason, the airbag storage cover excellent in the expansion | deployment performance in the wide temperature range from low temperature to high temperature can be provided as an injection molding of the thermoplastic elastomer composition of this invention.
In addition, as an extruded product of the thermoplastic elastomer composition of the present invention, a vehicle window peripheral part or an automobile interior skin can be provided.

  Hereinafter, the present invention will be described in detail, but the present invention is not limited to the following description, and can be arbitrarily modified and implemented without departing from the gist of the present invention. In addition, in this specification, when expressing by putting a numerical value or a physical-property value before and behind using "-", it shall use as what includes the value before and behind.

[Thermoplastic elastomer composition]
The thermoplastic elastomer composition of the present invention contains at least the following component (B) and the following compound (C), and preferably further contains the following component (A).
Component (A): Propylene polymer having a propylene unit content of 85 to 100% by mass Component (B): Olefin block copolymer containing ethylene-containing polymer block and ethylene / α-olefin copolymer block Compound (C): Peroxydicarbonate

<Action mechanism>
Component (B) is excellent in high-temperature strength and low-temperature impact resistance because it is an olefin block copolymer containing a polymer block containing ethylene and an ethylene / α-olefin copolymer block. By blending such a component (B) with the peroxydicarbonate of the compound (C) as a cross-linking agent, the flexibility can be improved and the low-temperature impact property can be improved due to the cross-linking effect of the rubber.
That is, peroxydicarbonate is converted into an organic peroxide such as 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, which is blended as a crosslinking agent in a conventional crosslinked thermoplastic elastomer composition. Compared with the resin, the decomposition effect on the resin is extremely small and the crosslinking effect on the elastomer is large. Therefore, the flexibility can be improved and the low-temperature impact property can be improved by the crosslinking effect without impairing the mechanical properties of the resin.
When the thermoplastic elastomer composition of the present invention further contains the propylene polymer of the component (A), the moldability and the strength, rigidity, appearance, etc. of the obtained molded product can be improved.

<Component (A)>
The thermoplastic elastomer composition of the present invention preferably contains a propylene polymer having a propylene unit content of 85 to 100% by mass as component (A). When the thermoplastic elastomer of the present invention contains such a component (A), the injection moldability and extrusion moldability are improved, and the strength, rigidity, appearance and the like of the resulting molded article are improved. it can.

  The propylene-based polymer of component (A) may be a propylene homopolymer (polypropylene), or in addition to propylene units, propylene / (propylene units containing ethylene units, ethylene and α-olefin units other than propylene. (Ethylene and / or α-olefin) copolymer or a propylene-based block copolymer. Moreover, you may contain monomer units other than ethylene and alpha-olefin.

  When the component (A) is a propylene-based copolymer having an α-olefin unit, examples of the α-olefin unit other than ethylene and propylene include an α-olefin having 4 to 20 carbon atoms. Examples of the α-olefin having 4 to 20 carbon atoms include 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-eicocene, 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl Examples include -1-pentene, 2-ethyl-1-hexene, 2,2,4-trimethyl-1-pentene, and the like. The α-olefin other than propylene is preferably an α-olefin having 4 to 10 carbon atoms, more preferably 1-butene, 1-hexene or 1-octene.

  More specifically, the propylene-based polymer of component (A) is a propylene homopolymer (polypropylene), a propylene / ethylene copolymer, a propylene / 1-butene copolymer, a propylene / 1-hexene copolymer. , Ethylene such as propylene / 1-octene copolymer, propylene / ethylene / 1-butene copolymer, propylene / ethylene / 1-hexene copolymer, propylene / ethylene / 1-octene copolymer, and 4 to 4 carbon atoms And a copolymer of at least one monomer selected from 10 α-olefins and propylene. Also, a propylene-based polymer comprising a propylene-based polymer component (A1) having a propylene unit content of 90 to 100% by mass and an ethylene / propylene copolymer component (A2), preferably containing a propylene unit in the first step Examples thereof include a propylene-based block copolymer obtained by polymerizing a propylene-based polymer having an amount of 90 to 100% by mass and then polymerizing an ethylene / propylene copolymer in the second step. Among these, as the component (A), from the viewpoint of low temperature impact resistance and high temperature strength, polypropylene or a propylene-based polymer having a propylene unit content of 90 to 100% by mass in the first step is polymerized. Subsequently, a propylene-based block copolymer obtained by polymerizing an ethylene / propylene copolymer in the second step is preferable.

  The propylene unit content of the propylene-based polymer of component (A) is preferably 85 to 100% by mass, more preferably 90 to 100% by mass, based on the entire component (A). When the content of the propylene unit in the component (A) is at least the lower limit value, heat resistance and rigidity tend to be good. The propylene unit content in component (A) can be determined by infrared spectroscopy.

  Component (A) is a propylene polymer comprising a propylene polymer component (A1) having a propylene unit content of 90 to 100% by mass and an ethylene / propylene copolymer component (A2), preferably the first step In the case of a propylene-based block copolymer obtained by polymerizing a propylene-based polymer having a propylene unit content of 90 to 100% by mass and then polymerizing an ethylene / propylene copolymer in the second step, (A) preferably contains 60 to 95% by mass of component (A1) with respect to the total amount of component (A1) and component (A2). If the content of the component (A1) in the component (A) is less than the above lower limit, the mechanical strength and rigidity tend to decrease, and if it exceeds the upper limit, the impact resistance is improved by including the component (A2). The effect cannot be obtained sufficiently. The content of the component (A1) in the component (A) is more preferably 65% by mass or more, further preferably 70% by mass, and more preferably 99% by mass or less.

  In addition, the ethylene unit of the ethylene / propylene copolymer of the component (A2) only needs to satisfy the preferable propylene unit content of the component (A) described above, but is usually about 20 to 80% by mass.

  The melt flow rate (230 ° C., load 21.2 N) of component (A) is not limited, but is usually 0.1 g / min or more, and preferably 10 g / 10 min or more from the viewpoint of the appearance of the molded product. More preferably, it is 20 g / 10 minutes or more, More preferably, it is 30 g / 10 minutes or more. Further, the melt flow rate (230 ° C., load 21.2 N) of the component (A) is usually 200 g / 10 minutes or less, and preferably 150 g / 10 minutes or less, more preferably from the viewpoint of tensile strength. It is 100 g / 10 minutes or less. The melt flow rate of the component (A) is measured under the conditions of a measurement temperature of 230 ° C. and a measurement load of 21.2 N according to ISO 1133.

  As the component (A), one of the above-mentioned propylene polymers may be used alone, or two or more of those having different monomer compositions and physical properties may be mixed and used. When mixed and used, the component (A) as a mixture preferably satisfies the above-mentioned propylene unit content and melt flow rate.

  As a method for producing the propylene polymer of component (A), a known polymerization method using a known olefin polymerization catalyst is used. For example, a polymerization method using a Ziegler-Natta catalyst can be mentioned. As the polymerization method, a slurry polymerization method, a solution polymerization method, a bulk polymerization method, a gas phase polymerization method, or the like can be used, and two or more of these may be combined.

  In addition, as the component (A), a commercially available product can be used. Specifically, it can be procured from the manufacturers listed below and can be selected as appropriate. Available commercial products include Prime Polymer's Prime Polypro (registered trademark), Sumitomo Chemical Sumitomo Noblen (registered trademark), Sun Allomer's polypropylene block copolymer, Nippon Polypro's Novatec (registered trademark) PP, LyondellBasel Moplen (R), ExxonMobil's ExxonMobil PP, Formosa Plastics' Formolene (R), Borealis's Borealis PP, LG Chemical's SEETEC PP, A. Schulman's ASI POLYPROPYLENE, INEOS Olefins & Polymers, Inc. of INEOS PP, Braskem's Braskem PP, SAMSUNG TOTAL PETROCHEMICALS's Sumsung Total, Sabic's Sabic (registered trademark) PP, TOTAL PETROCHEMICALS company of TOTAL PETROCHEMICALS Polypropylene, SK Corporation of YUPLENE ( Registered trademark).

  When the thermoplastic elastomer composition of the present invention contains the component (A), the content of the component (A) in the thermoplastic elastomer composition is 100 parts by mass in total of the component (B) and the component (A). It is preferable that it is 10-90 mass parts with respect to it, especially 15-85 mass parts, especially 25-75 mass parts. When the thermoplastic elastomer composition of the present invention contains the component (A), the injection moldability and extrusion moldability are improved, and the strength, rigidity, appearance, and the like of the resulting molded body can be improved. However, if the content is too small, the above effect cannot be obtained sufficiently. If the content of component (A) is too large, the content of other components will be relatively small, and low temperature impact resistance, tensile strength at cutting, elongation at cutting, etc. tend to decrease. The content of (A) is preferably not more than the above upper limit.

<Component (B)>
Component (B) contained in the thermoplastic elastomer composition of the present invention is an olefin-based block copolymer containing a polymer block containing ethylene and an ethylene / α-olefin copolymer block. The component (B) preferably has a crystal melting peak at 110 to 125 ° C., and its crystal melting heat is 20 to 60 J / g. Here, in the component (B), the heat of crystal fusion at the crystal melting peak at 110 to 125 ° C. is 20 to 60 J / g, which means that the component (B) has a polymer block containing crystalline ethylene. It is an index to represent. In addition to the crystallinity based on the polymer block containing ethylene, the component (B) has an amorphous property based on the block of the ethylene / α-olefin copolymer. When component (B) has such a structure, the thermoplastic elastomer composition of the present invention is imparted with the effects of high-temperature strength and low-temperature impact resistance. The amount of heat of crystal melting of the component (B) is more preferably 30 J / g or more from the viewpoint of high temperature strength, and more preferably 50 J / g or less from the viewpoint of low temperature impact resistance.

The crystalline polymer block in the component (B) contains ethylene and may have other monomer units in addition to ethylene. Examples of other monomer units include 1-propylene, 1-butene, 2-methylpropylene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like. It can be illustrated. Preferably, it is a C3-C8 alpha olefin which has a carbon-carbon double bond in the terminal carbon atoms, such as 1-propylene, 1-butene, 1-hexene, 1-octene. In the polymer block containing ethylene, only one of these α-olefins may be copolymerized with ethylene, or two or more of these α-olefins may be copolymerized with ethylene.
However, when this polymer block contains other monomer units other than ethylene, in order to effectively obtain the crystallinity effect due to the polymer block of ethylene, the ethylene of the polymer block containing ethylene The unit content is preferably 20% by mass or more, more preferably 30% by mass or more, still more preferably 35 to 95% by mass, and particularly preferably 45 to 90% by mass.

  The α-olefin constituting the ethylene / α-olefin copolymer block of the component (B) includes 1-propylene, 1-butene, 2-methylpropylene, 1-pentene, 3-methyl-1-butene, 1-propylene, Hexene, 4-methyl-1-pentene, 1-octene and the like can be mentioned, and preferably a terminal carbon atom such as 1-propylene, 1-butene, 1-hexene and 1-octene has a carbon-carbon double bond. It is an α-olefin having 4 to 8 carbon atoms. The α-olefin in the ethylene / α-olefin copolymer block of the component (B) may be one kind copolymerized with ethylene or two or more kinds copolymerized with ethylene.

  The content of the ethylene unit in the ethylene / α-olefin copolymer block of the component (B) is preferably an amount such that the content of the ethylene unit in the entire component (B) is a preferable content described later.

  The ethylene / α-olefin copolymer block of component (B) includes other monomers such as monomer units based on nonconjugated dienes (nonconjugated diene units) in addition to ethylene units and the above α-olefin units. You may have a unit. Examples of the non-conjugated diene include 1,4-hexadiene, 1,6-octadiene, 2-methyl-1,5-hexadiene, 6-methyl-1,5-heptadiene, and 7-methyl-1,6-octadiene. Chain non-conjugated dienes; cyclohexadiene, dicyclopentadiene, methyltetrahydroindene, 5-vinylnorbornene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, 5-isopropylidene-2-norbornene, 6- And cyclic non-conjugated dienes such as chloromethyl-5-isopropenyl-2-norbornene. 5-Ethylidene-2-norbornene and dicyclopentadiene are preferable.

Component (B) containing ethylene block and ethylene / α-olefin copolymer block (B) The content of ethylene units in the olefin block copolymer is the content of ethylene units and the content of α-olefin units. It is preferable that it is 40 to 80 mass% with respect to the total amount with quantity. The content of the ethylene unit in the component (B) is preferably larger in order to prevent fusion due to blocking of the component (B). From the viewpoint of low-temperature impact resistance when the thermoplastic elastomer composition of the present invention is molded. Then less is preferable. The content of the ethylene unit in the component (B) is more preferably 45% by mass or more, and still more preferably 60% by mass or more. The ethylene unit content is more preferably 80% by mass or less.
In addition, when the component (B) has a monomer unit other than ethylene and α-olefin, such as a non-conjugated diene unit, the content is usually 10% by mass or less based on the whole component (B), Preferably it is 5 mass% or less.
In addition, the content of the ethylene unit, the content of the α-olefin unit, the content of the non-conjugated diene unit, etc. in the component (B) can be determined by infrared spectroscopy.

  Specifically, as the component (B) used in the present invention, a crystalline ethylene polymer block, an ethylene / 1-butene copolymer, an ethylene / 1-hexene copolymer, an ethylene / 1-octene copolymer, An olefin block copolymer comprising an ethylene / α-olefin copolymer block such as an ethylene / propylene / 1-butene copolymer, an ethylene / propylene / 1-hexene copolymer, and an ethylene / propylene / 1-octene copolymer. A polymer can be illustrated. Among these, the component (B) is preferably an olefin-based block copolymer including an ethylene polymer block and an ethylene / 1-octene copolymer block.

  In addition to having a polymer block containing ethylene having crystallinity, the component (B) has an amorphous property due to an ethylene / α-olefin copolymer block. This amorphous property is expressed by a glass transition temperature, and the glass transition temperature by DSC method is preferably −50 ° C. or lower, more preferably −55 ° C. or lower.

  The melt flow rate (MFR) of component (B) (measuring temperature 190 ° C., measuring load 21.2 N) is not limited, but is usually 10 g / 10 min or less, and preferably 8 g / 10 min or less from the viewpoint of strength. More preferably, it is 5 g / 10 minutes or less, More preferably, it is 3 g / 10 minutes or less. Further, the MFR of the component (B) is usually 0.01 g / 10 min or more, and from the viewpoint of fluidity, it is preferably 0.05 g / 10 min or more, more preferably 0.10 g / 10 min or more. It is. The MFR of the component (B) is measured according to ISO 1133 under the conditions of a measurement temperature of 190 ° C. and a measurement load of 21.2N.

The density of the component (B) from the viewpoint of low-temperature impact resistance, preferably at 0.880 g / cm ³ or less, more preferably 0.870 g / cm ³ or less. On the other hand, the lower limit is not particularly limited, but is usually 0.850 g / cm ³ or more.

  Component (B) can be synthesized, for example, according to the methods disclosed in JP-T 2007-529617, JP-T 2008-537563, and JP-T 2008-543978. For example, a first olefin polymerization catalyst and a second olefin polymerization catalyst capable of preparing a polymer having different chemical or physical properties from the polymer prepared by the first olefin polymerization catalyst under equivalent polymerization conditions And a composition containing a mixture or reaction product obtained by combining a chain shuttling agent, and producing the ethylene and α-olefin through a step of contacting the composition under addition polymerization conditions. can do.

  For the polymerization of component (B), a continuous solution polymerization method is preferably applied. In continuous solution polymerization, catalyst components, chain shuttling agents, monomers, and optionally solvents, adjuvants, scavengers and polymerization aids are continuously fed to the reaction zone from which the polymer product is continuously fed. It is taken out. The length of the block can be changed by controlling the ratio and type of the catalyst, the ratio and type of chain shuttling agent, the polymerization temperature, and the like.

  In the method for synthesizing the block copolymer, other conditions are disclosed in JP-T-2007-529617, JP-T 2008-537563, and JP-T 2008-543978.

  As the component (B), one kind may be used alone, or two or more kinds having different monomer compositions and physical properties may be mixed and used. It is preferable that ethylene unit content and physical property as satisfy | fill said preferable range.

  As the component (B), commercially available products can be used. Examples include Engage (registered trademark) -XLT series and INFUSE (registered trademark) series manufactured by Dow Chemical.

By including the component (B), the thermoplastic elastomer composition of the present invention can obtain good low temperature impact resistance.
The thermoplastic elastomer composition of the present invention may contain only the component (B) as a resin component. However, from the viewpoint of the rigidity of the obtained molded article, the thermoplastic elastomer composition of the present invention comprises a component ( It is preferable to contain B) and a component (A) in the above-mentioned suitable range.

<Compound (C)>
The peroxydicarbonate of the compound (C) is preferably a compound represented by the following general formula.
R ¹ —OC (O) OOC (O) O—R ² (1)
(In General Formula (1), R ¹ and R ² are each independently a group selected from the following groups.
_{CH 3, 2-i-C} 3 H 7 O-C 6 H 4, C 2 H 5 CH (CH 3), 4-CH 3 -C 6 H 4, Cl 3 CC (CH 3) 2, C 7 H _{15, c-C 6 H 11} CH 2, 3-t-C 4 H 9 -C 6 H 5, Cl 3 Si (CH 2) 3, C 6 H 5, CH 3 CH (OCH 3) CH 2 CH 2 _{, C 6 H 5 OCH 2 CH} 2, C 6 H 5 CH 2, z-C 8 H 17 CH = CH (CH 2) 8, 2-CH 3 -C 6 H 4, (CH 3) 2 CHCH 2 CH (CH ₃ ), 3,4-di-CH ₃ —C ₆ H ₃ , Cl ₃ C, CHCH (Cl), ClCH ₂ , [C ₂ H ₅ OC (O)] ₂ CH (CH ₃ ), 3, _{5-di-CH 3 -C 6} H 3, C 8 H 17, C 2 H 5, C 18 H 37, 2- oxo-1,3 - Jiokusoran _{-4-CH 2, C 2 H} 5 CH (Cl) CH 2, 4-CH 3 O-C 6 H 4, i-C 4 H 9, CH 3 SO 2 CH 2 CH 2, C 12 H 25 _{, C 6 H 5 CH (Cl} ) CH 2, H 2 C = CHC (O) OCH 2 CH 2, 4-NO 2 -C 6 H 4, C 4 H 9, C 10 H 21, C 4 H 9 CH _{(C 2 H 5) CH 2} , H 2 C = CHCH 2, 2-Cl-c-C 6 H 10, H 2 C = C (CH 3) CH 2, c-C 6 H 11, ClCH 2 CH 2 _{, 4- [C 6 H 5 -N} = N] -C 6 H 4 CH 2, C 16 H 33, 1- _{naphthyl, 4-t-C 4 H} 9 -C 6 H 10, 2,4,5- _{tri-Cl-C 6 H 2} , Cl (CH 2) 3, C 14 H 29, 9- fluorenyl, _4-NO 2 -C _{6 H 4 CH 2, 2-} i-C 3 H 7 -C 6 H 4, CH 3 OCH 2 CH 2, H 2 C = C (CH 3), 3-CH 3 -C 6 H 4, BrCH 2 CH _{2, 3-CH 3 -5-} i-C 3 H 7 -C 6 H 3, Br 3 CCH 2, C 2 H 5 OCH 2 CH 2, 4-CH 3 OC (O) -C 6 H 4, H _{2 C = CH, i-C} 3 H 7, 2-C 2 H 5 CH (CH 3) -C 6 H 4, Cl 3 CCH 2, C 5 H 11, c-C 12 H 23, 4-t- _{C 4 H 9 -C 6 H 4} , C 6 H 13, C 3 H 7, CH 3 OCH 2 CH 2, C 6 H 13 CH (CH 3), CH 3 OC (CH 3) 2 CH 2 CH 2, _{C 3 H 7 OCH 2 CH 2} , CH 3 OCH 2 CH (CH 3), 2-i-C 3 H 7 -5-CH 3 - _{c-C 6 H 9, C} 4 H 9 CCH 2 CH 2, t-C 4 H 9, (CH 3) 3 CCH 2
Here, i = iso, t = tertiary, z = cis, and c = cyclic. C ₆ H ₅ , C ₆ H ₄ , C ₆ H ₃ , and C ₆ H ₂ are benzene rings. )

  Among these, from the viewpoint of crosslinking efficiency, bis (4-tert-butylcyclohexyl) peroxydicarbonate, dicetylperoxydicarbonate, dimyristylperoxydicarbonate (these peroxydicarbonates are solid at room temperature. And diisopropyl peroxydicarbonate, di-n-butyl peroxydicarbonate, bis (2-ethylhexyl) peroxydicarbonate (these peroxydicarbonates are liquid at room temperature). Of these, dicetyl peroxydicarbonate is particularly preferable.

  These compounds (C) may use only 1 type and may use 2 or more types together.

Content of the compound (C) in the thermoplastic elastomer composition of this invention is 0.01-10 mass parts with respect to 100 mass parts of olefin type block copolymers of a component (B), Especially 0.1-8. It is preferable that it is a mass part, especially 0.1-4 mass parts. Moreover, when the thermoplastic elastomer composition of this invention contains a component (A), content of the compound (C) in the thermoplastic elastomer composition of this invention is 100 in total of a component (A) and a component (B). It is preferable that it is 0.01-10 mass parts with respect to a mass part, especially 0.1-8 mass parts, especially 0.1-6 mass parts.
When content of a compound (C) is more than the said minimum, effects, such as low-temperature impact resistance by mix | blending a compound (C), can fully be acquired. However, if the content of the compound (C) exceeds the above upper limit, the molecular weight of the resin may be remarkably lowered due to the decomposition effect of the peroxide. Therefore, the content of the compound (C) may be set to the upper limit or less. preferable.

<Other optional components>
In the thermoplastic elastomer composition of the present invention, the following additives other than the compound (C) and components (A), Arbitrary components, such as resin other than (B) and elastomer (henceforth "other resin"), can be mix | blended.
Optional components include colorants, antioxidants, heat stabilizers, light stabilizers, UV absorbers, neutralizers, lubricants, anti-clouding agents, anti-blocking agents, flame retardants, dispersants, antistatic agents, and conductivity. Examples thereof include various additives and fillers such as an imparting agent, a metal deactivator, a molecular weight modifier, a fungicide, a fungicide, and a fluorescent brightener. Moreover, you may use crosslinking agents other than a compound (C) as a crosslinking adjuvant.

  Examples of the antioxidant include phenolic antioxidants, phosphite antioxidants, thioether antioxidants, and the like. When using antioxidant, it is normally used in 0.01-3.0 mass parts with respect to a total of 100 mass parts of a component (B) and the component (A) used as needed.

  Examples of the filler include glass fiber, hollow glass sphere, carbon fiber, talc, calcium carbonate, mica, potassium titanate fiber, silica, metal soap, titanium dioxide, and carbon black. When using a filler, it is normally used by 0.1-50 mass parts with respect to a total of 100 mass parts of a component (B) and the component (A) used as needed.

  Examples of the lubricant include oleic amide, erucic acid amide, and silicone oil. When using a lubricant, it is normally used in the range of 0.01 to 5.0 parts by mass with respect to 100 parts by mass in total of the component (B) and the component (A) used as necessary.

  Although the compound (C) contained in the thermoplastic elastomer composition of the present invention functions as a crosslinking agent, the thermoplastic elastomer composition of the present invention contains a conventional thermoplastic elastomer composition other than the compound (C). You may use together the crosslinking agent currently used for the thing as a crosslinking adjuvant further. The crosslinking aid is not particularly limited, but an organic peroxide crosslinking agent is particularly preferable. The organic peroxide crosslinking agent may be either aromatic or aliphatic, and may be a single peroxide or a mixture of two or more peroxides. Specifically, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl -2,5-di (t-butylperoxy) hexyne-3, 1,3-bis (t-butylperoxyisopropyl) benzene, 1,1-di (t-butylperoxy) -3,3,5 -Dialkyl peroxides such as trimethylcyclohexane, t-butylperoxybenzoate, t-butylperoxyisopropyl carbonate, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, 2,5-dimethyl-2 Peroxyesters such as, 5-di (benzoylperoxy) hexyne-3, acetyl peroxide, lauroyl peroxide, benzoy Peroxide, p- chlorobenzoyl peroxide, diacyl peroxides, and the like, such as 2,4-dichlorobenzoyl peroxide are used.

  When using these crosslinking agents as a crosslinking aid, the content of the crosslinking aid in the thermoplastic elastomer composition is 100 parts by mass in total of the component (B) and the component (A) used as necessary. 0 to 6 parts by mass, particularly 0 to 2 parts by mass is preferable.

  Examples of thermoplastic resins other than components (A) and (B) include polyphenylene ether resins; polyamide resins such as nylon 6 and nylon 66; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; polyoxymethylene homo Polyoxymethylene resins such as polymers and polyoxymethylene copolymers; polymethyl methacrylate resins, polyolefin resins (excluding those corresponding to components (A) and (B)), styrene resins, acrylic resins , Polycarbonate resin, polyvinyl chloride resin, various elastomers other than the above, and the like. Other resins mentioned above may contain only one type or two or more types. When the thermoplastic elastomer composition of the present invention contains these other resins, the component (B) and the compound (C) are included, and preferably the above-described effects by including the component (A) are obtained effectively. Above, it is preferable that the thermoplastic elastomer composition of this invention contains 60 mass% or more of a component (B) and the component (A) used as needed in total.

<Method for producing thermoplastic elastomer composition>
The thermoplastic elastomer composition of the present invention comprises the above component (B) and compound (C), and the component (A) used as necessary, in an ordinary extruder, Banbury mixer, roll, Brabender plastograph, kneader. It can be produced by kneading by a conventional method using a Brabender or the like. Among these production methods, it is preferable to use an extruder, particularly a twin-screw extruder. When the thermoplastic elastomer composition of the present invention is produced by kneading with an extruder or the like, the thermoplastic elastomer composition can be usually produced by melt-kneading while being heated to 160 to 240 ° C, preferably 180 to 220 ° C.

  In particular, when producing the thermoplastic elastomer composition of the present invention, it is dynamically heat-treated (dynamic crosslinking) in the presence of the compound (C), and the component (B) and the component (if necessary) ( It is preferred to partially crosslink A).

  Here, the dynamic heat treatment (dynamic heat treatment) means kneading in a molten state or a semi-molten state. Usually, the dynamic heat treatment is carried out by uniformly kneading the above-mentioned components and then melt-kneading them in the presence of the compound (C) serving as a crosslinking agent and a crosslinking aid used as necessary.

<Melt flow rate>
The thermoplastic elastomer composition of the present invention preferably has a melt flow rate (MFR) of 0.1 to 150 g / 10 min at a temperature of 230 ° C. and a measurement load of 21.2 N in accordance with ISO 1133. If the MFR is less than 0.1 g / 10 min, the fluidity is poor and unsuitable for injection molding or extrusion molding. If the MFR is greater than 150 g / 10 min, the appearance of molded products such as burrs and flow marks during injection molding is poor. This may cause the molded product to be significantly deformed during extrusion. From the viewpoint of fluidity, the MFR is more preferably 0.5 g / 10 min or more. On the other hand, from the viewpoint of suppressing burrs, flow marks, sink marks and the like during molding, it is more preferably 100 g / 10 min or less, still more preferably 50 g / 10 min or less, and particularly preferably 30 g / 10 min or less.
The MFR of the thermoplastic elastomer of the present invention tends to increase when the component (A), which is a component having high fluidity, is increased, and tends to decrease as the component (B) having low fluidity increases. .

<Molding method>
The thermoplastic elastomer composition of the present invention can be molded by a known method as required and used as various molded products. Examples of the molding method include molding methods usually used for thermoplastic elastomers, such as injection molding, extrusion molding, hollow molding, and compression molding. Moreover, you may perform secondary processes, such as lamination molding and thermoforming, after that. The thermoplastic elastomer composition of the present invention may be formed as a single body or may be combined with other materials to form a laminate.

[Airbag storage cover]
Using the thermoplastic elastomer composition of the present invention, generally, using a normal injection molding method, or various molding methods such as a gas injection molding method, an injection compression molding method, and a short shot foam molding method, if necessary. By using a molded body, it can be used as an airbag storage cover. In particular, the molding conditions for injection molding the airbag storage cover are as follows.

  The molding temperature when the airbag housing cover is injection-molded is usually 150 to 300 ° C, preferably 180 to 280 ° C. The injection pressure is usually 5 to 100 MPa, preferably 10 to 80 MPa. The mold temperature is usually 0 to 80 ° C, preferably 20 to 60 ° C.

  The airbag storage cover obtained by molding the thermoplastic elastomer composition of the present invention operates by sensing the impact and deformation of a high-speed moving body such as an automobile in the event of a collision, etc. Used as an airbag storage cover of an airbag system that protects an occupant.

[Vehicle window parts / car interior skin]
By using the thermoplastic elastomer composition of the present invention, an extrusion molding method or an injection molding method, a window shield part, a molding part for a vehicle window such as a windshield molding, a back window molding, a roof molding, an instrument panel, a front pillar trim, a door trim. An automobile interior skin such as a shift lever, various consoles, and a skin material for a headlining can be formed.

  The molding temperature at the time of extruding the parts around the car window and the automobile interior skin is usually 100 to 250 ° C, preferably 150 to 230 ° C. The molding temperature at the time of injection molding is usually 150 to 250 ° C, preferably 180 to 230 ° C.

  The parts around the car window and the automobile interior skin obtained by molding the thermoplastic elastomer composition of the present invention sufficiently satisfy the required characteristics such as low-temperature impact resistance.

  EXAMPLES Hereinafter, although the content of this invention is demonstrated more concretely using an Example, this invention is not limited by a following example, unless the summary is exceeded. The values of various production conditions and evaluation results in the following examples have meanings as preferred values of the upper limit or lower limit in the embodiments of the present invention, and preferred ranges are the above-described upper limit or lower limit values and the following values: It may be a range defined by a combination of values of the examples or values of the examples.

[material]
<Component (A)>
A-1: Propylene polymer (Novatec (registered trademark) PP BC03B, manufactured by Nippon Polypro Co., Ltd., ethylene / propylene block copolymer, propylene unit content: 91% by mass, MFR (ISO 1133 (230 ° C., 21.2 N)) ) = 30g / 10min)
A-2: Propylene polymer (Novatech (registered trademark) PP MG03BD, ethylene / propylene random copolymer, MFR (ISO 1133 (230 ° C., 21.2 N)) = 30 g / 10 min, manufactured by Nippon Polypro Co., Ltd.)

<Component (B)>
B-1: Olefin-based block copolymer (Tafmer (registered trademark) A1050S manufactured by Mitsui Chemicals, Inc., an olefin-based block copolymer having an ethylene polymer block and an ethylene / 1-butadiene copolymer block, an ethylene unit Content: 70% by mass, MFR (ISO 1133 (190 ° C., 21.2 N)): 1.2 g / 10 min, density: 0.86 g · cm ³ , Mooney viscosity ML _{1 + 4} (100 ° C.): 40)
B-2: Olefin-based block copolymer (Engage (registered trademark), EG8150, manufactured by Dow Chemical Co., Ltd., an olefin-based block copolymer having an ethylene polymer block and an ethylene / 1-octene copolymer block, an ethylene unit Content: 63% by mass, MFR (ISO 1133 (190 ° C., 21.2 N): 0.5 g / 10 min, density: 0.86 g / cm ³ , Mooney viscosity ML _{1 + 4} (121 ° C.): 33))

<Compound (C)>
C-1: Dicetyl peroxydicarbonate (Perkadox 24FL manufactured by Akzo Nobel Co., Ltd.)

<Crosslinking aid>
D-1: Divinylbenzene (manufactured by Wako Pure Chemical Industries, Ltd., divinylbenzene content: 55% by mass)

<Comparative cross-linking agent>
C-2: 2,5-dimethyl-2,5-di (t-butylperoxy) hexane (Kayahexa AD-40C manufactured by Kayaku Akzo)

<Antioxidant>
Tetrakis [methylene-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate] methane (Irganox 1010 manufactured by Ciba Specialty Chemicals)

[Evaluation method]
<MFR>
Measurement was performed under conditions of a temperature of 230 ° C. and a measurement load of 21.2 N in accordance with ISO 1133. From the viewpoint of fluidity, those having an MFR of 0.5 g / 10 min or more are preferred.

<Glossiness>
The following low-temperature impact resistance test pieces were measured according to ISO 2813 at an incident angle of 60 °. The glossiness is preferably 70 or less from the viewpoint of the appearance of the molded product.

<Low temperature impact resistance: Izod impact strength>
Using the obtained thermoplastic elastomer composition, with an inline screw type injection molding machine (“SE-180” manufactured by Sumitomo Heavy Industries, Ltd.), an injection pressure of 70 MPa, a cylinder temperature of 220 ° C., and a mold temperature of 40 ° C. A test piece for measuring Izod impact strength (a test piece having a thickness of 4 mm without notch, a width of 10 mm, and a length of 80 mm) was formed, and then a notch was formed with a notching machine to prepare a test piece. About the obtained test piece, the Izod impact strength (unit: kJ / m < ² >) in temperature -40 degreeC, -45 degreeC, and -50 degreeC performed according to ISO180 was measured. If the value of the Izod impact strength evaluated at the same temperature in the Izod impact test is high, the low temperature impact resistance is excellent. When the evaluation temperature is different, the low temperature impact resistance is excellent if the evaluation temperature is low and the evaluation result is good. In addition, the destruction state is in the order of partial destruction, hinge destruction, complete destruction, and the low-temperature impact performance is poor. The meaning of each notation is as follows.
H: Hinge failure: Incomplete failure in which only a thin hinge-like surface layer that has been bent and stiffened has become a test piece that cannot be separated together. Low temperature impact is worse than partial fracture.
P: Partial failure: Incomplete failure that does not meet the definition of hinge failure. Better impact at low temperatures than hinge breakage.
C: Complete destruction: A specimen that breaks into two or more pieces. Low temperature impact performance is the worst.
In Table 1, “80 (P)” indicates that the Izod impact strength is 80 kJ / m ² and partial fracture.
In addition, “78 (P) 1/4” means that four samples are evaluated and one Izod impact strength is 78 kJ / m ² , which means partial fracture.

<Tensile property: Tensile fracture test (ISO 37 Type-1A dumbbell, tensile speed 500 mm / min)>
Using the obtained thermoplastic elastomer composition, with an inline screw type injection molding machine (“SE-180” manufactured by Sumitomo Heavy Industries, Ltd.), an injection pressure of 70 MPa, a cylinder temperature of 220 ° C., and a mold temperature of 40 ° C. After forming a test piece for tensile test (a sheet having a thickness of 2 mm, a width of 120 mm, and a length of 80 mm), it was punched in accordance with ISO 37 (Type-1A dumbbell). With respect to this punched specimen, the tensile fracture strength (unit: MPa), the tensile yield strength (unit: MPa), and the tensile elongation at break (unit:%) were measured in an atmosphere of 23 ° C. in accordance with ISO 37.

<Bending elastic modulus>
Using the obtained thermoplastic elastomer composition, with an inline screw type injection molding machine (“SE-180” manufactured by Sumitomo Heavy Industries, Ltd.), an injection pressure of 70 MPa, a cylinder temperature of 220 ° C., and a mold temperature of 40 ° C. , A test piece for measuring the flexural modulus (thickness 4 mm × width 10 mm × length 80 mm) was formed. According to ISO 178, the span was 64 mm and the bending speed was 2 mm / min. The bending elastic modulus (unit: MPa) was measured. The flexural modulus is preferably in the range of 200 to 600 MPa.

[Examples 1-4, Comparative Examples 1-4]
Ingredients shown in Table-1 are blended as shown in Table-1 with a lubricant (oleic amide, addition amount 0.1 parts by mass) and a black pigment (carbon concentration 40% by mass, addition amount 1.5 parts by mass). Combined with Henschel mixer, blended for 1 minute and charged into the same direction twin screw extruder (Toshiba Machine Co., Ltd. “TEM 26SS”, L / D = 48.5, number of cylinder blocks = 12) at a speed of 20 kg / h. The mixture was melted and kneaded by raising the temperature in the range of 160 to 190 ° C. to produce pellets of the thermoplastic elastomer composition. Said evaluation was performed about the pellet of the obtained thermoplastic elastomer composition. The evaluation results are shown in Table-1.

Table 1 shows the following.
It turns out that Examples 1-2 are superior to Comparative Examples 1-2 which made the component (A) and the component (B) the same mixing | blending in the evaluation result of low temperature impact performance and glossiness. It can be seen that Example 3 is superior to Comparative Examples 3 to 4 in which the component (A) and the component (B) are blended in the evaluation results of the low temperature impact performance and the glossiness. Also, the tensile strength at the time of cutting and the elongation at the time of cutting are remarkably improved. It can be seen that Example 4 is superior to Comparative Example 5 in which the component (A) and the component (B) are blended in the evaluation result of the low temperature impact performance.
Comparative Examples 2, 4, and 5 are examples in which the component C-1 of Examples 1, 3, and 4 was changed to C-2, but due to the severe decomposition effect of C-2, the low-temperature impact performance of the material was significantly reduced. It can also be seen that the gloss level increases significantly.
Comparative Examples 1 and 3 are examples in which Component C-1 added to Examples 1 and 3 was not used. From a comparison between Comparative Examples 1 and 3 and Examples 1 and 3, Component C-1 It can be seen that the cross-linking effect after the addition of reduced the glossiness and improved the low-temperature impact performance.

Claims (11)

A thermoplastic elastomer composition containing at least the following component (B) and the following compound (C).
Component (B): Olefin-based block copolymer compound containing ethylene-containing polymer block and ethylene / α-olefin copolymer block (C): peroxydicarbonate   The thermoplastic elastomer composition according to claim 1, comprising 0.01 to 10 parts by mass of compound (C) with respect to 100 parts by mass of component (B).   Furthermore, the thermoplastic elastomer composition of Claim 1 or 2 containing the propylene-type polymer whose propylene unit content is 85-100 mass% as a component (A). The thermoplastic elastomer composition according to any one of claims 1 to 3, wherein the density of the component (B) is 0.880 g / cm ³ or less. The thermoplastic elastomer composition according to any one of claims 1 to 4, wherein the compound (C) is a compound represented by the following general formula (1).
R ¹ —OC (O) OOC (O) O—R ² (1)
(In General Formula (1), R ¹ and R ² are each independently a group selected from the following groups.
_{CH 3, 2-i-C} 3 H 7 O-C 6 H 4, C 2 H 5 CH (CH 3), 4-CH 3 -C 6 H 4, Cl 3 CC (CH 3) 2, C 7 H _{15, c-C 6 H 11} CH 2, 3-t-C 4 H 9 -C 6 H 5, Cl 3 Si (CH 2) 3, C 6 H 5, CH 3 CH (OCH 3) CH 2 CH 2 _{, C 6 H 5 OCH 2 CH} 2, C 6 H 5 CH 2, z-C 8 H 17 CH = CH (CH 2) 8, 2-CH 3 -C 6 H 4, (CH 3) 2 CHCH 2 CH (CH ₃ ), 3,4-di-CH ₃ —C ₆ H ₃ , Cl ₃ C, CHCH (Cl), ClCH ₂ , [C ₂ H ₅ OC (O)] ₂ CH (CH ₃ ), 3, _{5-di-CH 3 -C 6} H 3, C 8 H 17, C 2 H 5, C 18 H 37, 2- oxo-1,3 - Jiokusoran _{-4-CH 2, C 2 H} 5 CH (Cl) CH 2, 4-CH 3 O-C 6 H 4, i-C 4 H 9, CH 3 SO 2 CH 2 CH 2, C 12 H 25 _{, C 6 H 5 CH (Cl} ) CH 2, H 2 C = CHC (O) OCH 2 CH 2, 4-NO 2 -C 6 H 4, C 4 H 9, C 10 H 21, C 4 H 9 CH _{(C 2 H 5) CH 2} , H 2 C = CHCH 2, 2-Cl-c-C 6 H 10, H 2 C = C (CH 3) CH 2, c-C 6 H 11, ClCH 2 CH 2 _{, 4- [C 6 H 5 -N} = N] -C 6 H 4 CH 2, C 16 H 33, 1- _{naphthyl, 4-t-C 4 H} 9 -C 6 H 10, 2,4,5- _{tri-Cl-C 6 H 2} , Cl (CH 2) 3, C 14 H 29, 9- fluorenyl, _4-NO 2 -C _{6 H 4 CH 2, 2-} i-C 3 H 7 -C 6 H 4, CH 3 OCH 2 CH 2, H 2 C = C (CH 3), 3-CH 3 -C 6 H 4, BrCH 2 CH _{2, 3-CH 3 -5-} i-C 3 H 7 -C 6 H 3, Br 3 CCH 2, C 2 H 5 OCH 2 CH 2, 4-CH 3 OC (O) -C 6 H 4, H _{2 C = CH, i-C} 3 H 7, 2-C 2 H 5 CH (CH 3) -C 6 H 4, Cl 3 CCH 2, C 5 H 11, c-C 12 H 23, 4-t- _{C 4 H 9 -C 6 H 4} , C 6 H 13, C 3 H 7, CH 3 OCH 2 CH 2, C 6 H 13 CH (CH 3), CH 3 OC (CH 3) 2 CH 2 CH 2, _{C 3 H 7 OCH 2 CH 2} , CH 3 OCH 2 CH (CH 3), 2-i-C 3 H 7 -5-CH 3 - _{c-C 6 H 9, C} 4 H 9 CCH 2 CH 2, t-C 4 H 9, (CH 3) 3 CCH 2
Here, i = iso, t = tertiary, z = cis, and c = cyclic. C ₆ H ₅ , C ₆ H ₄ , C ₆ H ₃ , and C ₆ H ₂ are benzene rings. )   The heat according to any one of claims 3 to 5, wherein the component (A) is one or more of an ethylene / propylene block copolymer, an ethylene / propylene random copolymer, and polypropylene. Plastic elastomer composition.   The thermoplastic elastomer composition according to any one of claims 1 to 6, wherein a melt flow rate (230 ° C, 21.2N (ISO 1133)) is 0.1 to 150 g / 10 min.   An injection-molded article using the thermoplastic elastomer composition according to any one of claims 1 to 7.   The injection-molded article according to claim 8, which is an airbag storage cover.   An extrusion molded article using the thermoplastic elastomer composition according to any one of claims 1 to 7.   The extrusion-molded article according to claim 10, which is a car window part or an automobile interior skin.