JP2000072885A - Thermoplastic elastomer composition having excellent mechanical strength - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an olefin-based thermoplastic elastomer composition having excellent mechanical properties or the like. SOLUTION: This thermoplastic elastomer composition is obtained by partially or completely crosslinking a mixture of (A) 1-99 wt.% of an ethylene/α- olefin copolymer which comprises ethylene and a 6-12C α-olefin and is produced by using a metallocene-based catalyst, (B) 99-1 pts.wt. of a propylene-based resin [the total of the components A and B is 100 pts.wt.] and (C) 3-90 pts.wt. of a block copolymer composed of a polymer block A consisting essentially of at least one vinylaromatic compound and a polymer block B consisting essentially of at least one conjugated diene compound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an olefin-based thermoplastic elastomer composition having excellent mechanical strength. More specifically, the present invention relates to an olefin thermoplastic elastomer composition having an excellent balance of physical properties such as mechanical strength, processability, and moldability.

[0002]

2. Description of the Related Art In recent years, olefin-based thermoplastic elastomer compositions have been widely used in various fields because of their high flexibility, excellent rubber-like properties, and ease of various molding processes.

[0003] Among them, a so-called dynamic crosslinking is carried out by melting and kneading a radically crosslinkable olefin elastomer and a thermoplastic resin having no radical crosslinkability such as polypropylene in a continuous or batch type kneader in the presence of radicals. The crosslinked composition is a known composition, and is used for applications such as automobile parts because the heat resistance, oil resistance, compression set and the like are remarkably improved by crosslinking the elastomer component.

[0004] In recent years, due to increasing awareness of environmental issues, compared to conventionally used crosslinked rubber and soft polyvinyl chloride, there are fewer problems in waste disposal, recyclability, light weight, and other features. The olefinic thermoplastic elastomer composition has been reviewed and attracted attention, and there has been an increasing movement to use these materials as an alternative.

However, olefin-based thermoplastic elastomer compositions generally have somewhat poor mechanical strength, and have been a major obstacle in substituting a crosslinked rubber or soft polyvinyl chloride.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an olefin-based thermoplastic elastomer composition having excellent mechanical strength in view of the above situation.

[0007]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, have found that an olefin copolymer having a specific structure consisting of ethylene and an α-olefin and a specific block copolymer. It has been found that the problem can be solved by combining with a polymer, and the present invention has been completed.

That is, the present invention relates to (A) ethylene and a compound having 6 carbon atoms.
Ethylene-α-olefin copolymers 1 to 12 produced from metallocene catalysts
99 parts by weight, (B) 99 to 1 part by weight of a propylene-based resin [the total amount of (A) and (B) is 100 parts by weight], and (C) a polymer block mainly composed of at least one vinyl aromatic compound. A and a polymer block B mainly composed of at least one conjugated diene compound.
It is a thermoplastic elastomer composition obtained by partially or completely cross-linking a mixture with about 90 parts by weight.

Hereinafter, the present invention will be described in detail.

In the present invention, (A) the ethylene / α-olefin copolymer comprises ethylene and α-olefin having 6 to 12 carbon atoms.
-An ethylene / α-olefin copolymer comprising olefins.

As the α-olefin having 6 to 12 carbon atoms, for example, hexene-1,4-methylpentene-
1, heptene-1, octene-1, nonene-1, decene-1, undecene-1, dodecene-1 and the like.
Among them, hexene-1, 4-methylpentene-1 and octene-1 are preferred, and octene-1 is particularly preferred. Octene-1 is excellent in softening effect even in a small amount, and the obtained copolymer is excellent in mechanical strength.

(A) used in the present invention can be produced using a known metallocene catalyst.

In general, a metallocene-based catalyst is composed of a cyclopentadienyl derivative of a Group IV metal such as titanium or zirconium and a co-catalyst, and is not only highly active as a polymerization catalyst but also compared with a conventional Ziegler-based catalyst. The molecular weight distribution of the resulting polymer is narrow, and the distribution of the comonomer α-olefin having 6 to 12 carbon atoms in the copolymer is uniform.

Therefore, the properties of the ethylene / α-olefin copolymer produced by the metallocene catalyst are greatly different from those of the conventional one using a Ziegler catalyst or the like.

The characteristics of an olefin copolymer composed of ethylene and an α-olefin using a metallocene polymerization catalyst are listed below. Since the polymerization catalyst has high activity, the composition of the comonomer α-olefin can be greatly increased as compared with the conventional one, and an elastomeric polymer having high flexibility can be obtained even without a plasticizer. The comonomer distribution is uniform compared to Ziegler-based polymers. Therefore, the reaction site can be uniform in the crosslinking reaction. 3. Extremely sharp molecular weight distribution, extremely low molecular weight components, excellent mechanical strength and processability, and high quality compared to Ziegler polymers. Despite the sharp molecular weight distribution, when a long-chain branch is introduced, the melt index (I10) at 190 ° C./10 kgf specified by ASTM D1238 and the melt index (I2) at 190 ° C./2.16 kgf are obtained. 4. The ratio (I10 / I2) is large, and the processing characteristics are excellent. 5. It does not contain a diene component and has excellent resistance to environmental degradation. Even if the copolymerization ratio of the α-olefin is high, blocking hardly occurs, and a pellet-like form is possible.

In the case of an olefin copolymer which is a copolymer of ethylene and an α-olefin with a Ziegler catalyst, the above-mentioned melt index ratio (I10 / I2) and the molecular weight distribution show a substantially linear proportional relationship. The molecular weight distribution tends to increase as the ratio increases.
The molecular weight distribution is about 3 to 10.

On the other hand, in the case of an olefin polymer using a metallocene catalyst, the molecular weight distribution becomes a sharp value of less than 3.0 and the amount of low molecular weight components is extremely small regardless of the value of the melt index ratio. For this reason, workability is extremely excellent. The molecular weight distribution (Mw / Mn) of these olefinic elastomers is calculated by GPC.

(A) used in the present invention is α-
The copolymerization ratio of the olefin is preferably 1 to 60% by weight, more preferably 10 to 50% by weight, and most preferably 20 to 45% by weight. When the copolymerization ratio of the α-olefin exceeds 60% by weight, the mechanical strength of the composition is lowered and it is difficult to use the composition practically. On the other hand, when it is less than 1% by weight, flexibility is insufficient.

The density of (A) is preferably in the range of 0.8 to 0.9 g / cm ³ from the balance between mechanical strength and flexibility.

The olefin copolymer used in the present invention preferably has a long-chain branch. The presence of the long-chain branch enables the density to be lower than the ratio (% by weight) of the copolymerized α-olefin without lowering the mechanical strength. Hardness and high strength elastomer can be obtained. The ethylene / α-olefin copolymer having a long chain branch is described in US Pat. No. 5,278,272.

(A) desirably has a DSC melting point peak at room temperature or higher. When it has a melting point peak, the form is stable in the temperature range below the melting point, the handleability is excellent, and the stickiness is small.

The melt index of (A) used in the present invention is 0.01 to 100 g / 10 min (19
(0 ° C., 2.16 kg load) is preferably used, and more preferably 0.2 to 10 g / 10 min.
If it exceeds 100 g / 10 minutes, the crosslinking property of the thermoplastic elastomer composition will be insufficient, and if it is less than 0.01 g / 10 minutes, the fluidity will be poor and the processability will be undesirably reduced.

(A) used in the present invention may be a mixture of a plurality of types. In such a case, it is possible to further improve the workability.

In the present invention, the propylene resin (B) is a homo isotactic polypropylene, propylene and ethylene, butene-1, pentene-1, hexene-
And isotactic propylene resins (including block and random) with other α-olefins such as 1.

At least one resin selected from these resins is used in a composition ratio of 1 to 99 parts by weight. Preferably 10 to 90 parts by weight, more preferably 20 to 80 parts by weight.
Parts by weight. If the amount is less than 1 part by weight, the fluidity and processability of the composition are reduced, and if it exceeds 99 parts by weight, the flexibility of the composition is insufficient, which is not desirable.

The melt index of the propylene resin (B) in the present invention is from 0.1 to 100 g / 10
Min (230 ° C., 2.16 kg load) is preferably used. If it exceeds 100 g / 10 minutes, the heat resistance of the composition, mechanical strength such as adhesive strength tends to decrease,
On the other hand, if it is less than 0.1 g / 10 minutes, the fluidity is poor and the molding processability is undesirably reduced.

In the present invention, a softening agent may be added to the composition comprising (A) and (B), if necessary, to improve workability.

The above-mentioned softening agent is preferably a paraffinic or naphthenic process oil. These are used in an amount of 0 to 250 parts by weight, preferably 10 to 150 parts by weight, per 100 parts by weight of (A) and (B) for adjusting the hardness and flexibility of the composition. If the amount exceeds 250 parts by weight, oil bleed becomes remarkable, which is not desirable.

In the present invention, the thermoplastic elastomer composition comprising (A) and (B) is used in combination with (A) the specific ethylene / α-olefin copolymer and (B) propylene resin described above. If necessary, by combining a softener with a specific composition ratio, the balance between mechanical strength, flexibility and workability is improved, and the composition can be preferably used.

In the present invention, (C) a polymer block A mainly composed of at least one vinyl aromatic compound and a polymer block B mainly composed of at least one conjugated diene compound
The block copolymer consisting of, for example, AB, ABA, BABA, ABAA
-BA, BABAB, (AB) ₄ Si,
It has a structure such as (BAB) ₄ Si and (BAB) ₄ Sn.

The polymer block mainly composed of a vinyl aromatic compound refers to a copolymer block of a vinyl aromatic compound containing 50% by weight or more of a vinyl aromatic compound and a conjugated diene compound and / or a vinyl aromatic compound alone. Shows the coalescing block.

The polymer block mainly composed of a conjugated diene compound refers to a copolymer block of a conjugated diene compound containing at least 50% by weight of a conjugated diene compound and a vinyl aromatic compound and / or a homopolymer block of a conjugated diene compound. Show.

As the vinyl aromatic compound constituting the block copolymer, styrene, methylstyrene, 1,3-
One or more of dimethylstyrene, p-tert-butylstyrene and the like can be used. Among them, styrene is preferred.

As the conjugated diene compound constituting the block copolymer, one or more of butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene and the like can be used. . Among them, butadiene, isoprene, or a combination thereof is preferable, and butadiene is particularly preferable.

The method for producing these block copolymers may be any known method, for example, using a polymerization initiator such as an organic lithium compound in a hydrocarbon solvent to block a vinyl aromatic compound and a conjugated diene compound. The number average molecular weight of the block copolymer having the above structure, which is a method of polymerizing, is 20,000 to 300,000, preferably 30.
000 to 200,000.

In the block copolymer, a polymer block B mainly composed of a conjugated diene compound may be partially hydrogenated so as not to affect the crosslinkability. The method of the hydrogenation reaction may be any known method,
For example, hydrogenation can be carried out in an inert solvent in the presence of a hydrogenation catalyst. The reaction conditions for hydrogenation are:
It is selected such that less than 80%, preferably less than 60%, of the conjugated diene compound is hydrogenated. The hydrogenation has the effect of further improving the weather resistance and heat resistance of the composition of the present invention.

The block copolymer (C) comprises (A) and (B)
Is used in a composition ratio of 3 to 90 parts by weight with respect to 100 parts by weight of the total amount of If the amount is less than 3 parts by weight, the mechanical strength is insufficiently improved, and if it exceeds 90 parts by weight, the thermal stability of the composition,
The weather resistance and the like are undesirably reduced.

Further, when the weight part of (A) the ethylene / α-olefin copolymer is larger than the weight part of the (C) block copolymer, the thermal stability and weather resistance of the composition become better. ,desirable.

The presence of the block copolymer in the composition of the present invention greatly improves the mechanical strength. During the cross-linking reaction, a cross-linking reaction occurs between the ethylene / α-olefin copolymer and the block copolymer, and the cross-linking takes place in a complicated and intricate manner, so that the molecular structure of the cross-linked body becomes huge and the mechanical strength It is thought that it led to the improvement of. In addition, the block copolymer has a high oil holding ability, and the composition of the present invention can hold a large amount of rubber oil, so that a low hardness composition can be easily obtained.

The present invention provides (A), (B),
It is necessary for the thermoplastic elastomer composition comprising (C) to partially or completely crosslink the composition with a radical initiator such as an organic peroxide or a radical initiator and a crosslinking assistant. This makes it possible to further improve the mechanical strength, heat resistance, oil resistance and the like of the composition.

Here, specific examples of the radical initiator preferably used include 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane,
1,1-bis (t-hexylperoxy) -3,3,5
-Trimethylcyclohexane, 1,1-bis (t-hexylperoxy) cyclohexane, 1,1-bis (t-
Butylperoxy) cyclododecane, 1,1-bis (t
-Butylperoxy) cyclohexane, 2,2-bis (t-butylperoxy) octane, n-butyl-4,
Peroxy ketals such as 4-bis (t-butylperoxy) butane and n-butyl-4,4-bis (t-butylperoxy) valerate; di-t-butyl peroxide, dicumyl peroxide, t -Butylcumyl peroxide, α, α′-bis (t-butylperoxy-m
-Isopropyl) benzene, α, α'-bis (t-butylperoxy) diisopropylbenzene, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane and 2,5-dimethyl-2,5 Dialkyl peroxides such as -bis (t-butylperoxy) hexyne-3; acetyl peroxide, isobutyryl peroxide, octanoyl peroxide, decanoyl peroxide, lauroyl peroxide, 3,5,5-trimethylhexa Diacyl peroxides such as noyl peroxide, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide and m-trioyl peroxide; t-butylperoxyacetate, t
-Butylperoxyisobutyrate, t-butylperoxy-2-ethylhexanoate, t-butylperoxylaurate, t-butylperoxybenzoate,
Di-t-butylperoxyisophthalate, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxymaleic acid, t-butylperoxyisopropyl carbonate, and cumylperoxyoctate Peroxyesters; and
Hydrogens such as t-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide and 1,1,3,3-tetramethylbutyl peroxide Peroxides can be mentioned.

Among these compounds, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl -2,5-bis (t-butylperoxy) hexane and 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne-3 are preferred.

These radical initiators are used in an amount of 0.02 to 3 parts by weight, preferably 0.05 to 1 part by weight, based on 100 parts by weight of the total of (A) and (C).
If the amount is less than 0.02 parts by weight, the crosslinking is insufficient, and if it exceeds 3 parts by weight, the physical properties of the composition are not improved, which is not preferable.

Further, as crosslinking aids, divinylbenzene, triallyl isocyanurate, triallyl cyanurate, diacetone diacrylamide, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate , Ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, diethylene glycol dimethacrylate, diisopropenylbenzene, P-quinone dioxime, P, P'-dibenzoylquinone dioxime, phenylmaleimide, allyl methacrylate, N, N'-
m-phenylene bismaleimide, diallyl phthalate,
Tetraallyloxyethane, 1,2-polybutadiene and the like are preferably used. These crosslinking aids may be used in combination of two or more.

These crosslinking aids are used in an amount of 0.1 to 5 parts by weight, preferably 0.5 to 2 parts by weight, based on 100 parts by weight of the total of (A) and (C). If the amount is less than 0.1 part by weight, crosslinking is insufficient, and if it exceeds 5 parts by weight, the physical properties of the composition are not improved, and an excessive amount of a crosslinking aid remains, which is not preferable.

In the present invention, (A), (B) and (C)
Other resins and elastomers may be added to the extent that their characteristics are not impaired, other than the thermoplastic elastomer composition comprising For example, polyamide resin, polyphenylene ether resin, polystyrene resin, polyvinyl chloride resin, polyester resin, polyphenylene sulfide resin, polycarbonate resin, polyolefin resin, polymethacrylate resin, polyacetal resin, polyarylate resin Resins, polysulfone resins, styrene-butadiene random copolymers, ethylene-vinyl ester copolymers and other ethylene-vinyl ester copolymers, ethylene-ethyl acrylate copolymers and other ethylene-unsaturated carboxylic acid ester copolymers Coal, ethylene-vinyl alcohol copolymer, polybutadiene, polybutene, polyisobutene, and the like. More specifically, the polystyrene resin is a rubber-modified styrene resin and / or
Alternatively, it is a non-rubber-modified styrene resin, and particularly, examples of the rubber-modified styrene resin include impact-resistant polystyrene, ABS resin (acrylonitrile-butadiene-styrene copolymer), and AAS resin (acrylonitrile-acryl rubber-styrene). Polymer), AES resin (acrylonitrile-ethylene propylene rubber-styrene copolymer) and the like. Here, especially chemical resistance, oil resistance,
In order to improve heat resistance and the like, a polyamide-based, polyester-based, or polycarbonate-based thermoplastic resin is preferable.

Further, the composition comprising (A), (B) and (C) of the present invention can contain an inorganic filler and a plasticizer to such an extent that their characteristics are not impaired. Examples of the inorganic filler used here include calcium carbonate, magnesium carbonate, silica, carbon black, glass fiber, titanium oxide, clay, mica, talc, magnesium hydroxide, and aluminum hydroxide.
Examples of the plasticizer include phthalic acid esters such as polyethylene glycol and dioctyl phthalate (DOP). Also, other additives, for example,
Lubricants, organic / inorganic pigments, heat stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, flame retardants, silicone oils, antiblocking agents, foaming agents, antistatic agents, antibacterial agents and the like are also suitably used.

The thermoplastic elastomer composition by dynamic crosslinking in the present invention can be produced by using a melt kneader usually used for producing such a thermoplastic elastomer composition. Specifically, there are a batch-type kneader such as a mixing roll, a Banbury mixer, and a pressure kneader, and a continuous-type kneader such as a single-screw extruder and a twin-screw extruder.

The thermoplastic elastomer composition comprising (A), (B) and (C) in the present invention can be produced through the following processing steps as a specific example. That is, the ethylene / α-olefin copolymer, the propylene-based resin, and the block copolymer are well mixed, and then charged into a hopper of an extruder. The radical initiator and the crosslinking assistant may be added together with the ethylene / α-olefin copolymer and the propylene-based resin from the beginning, or may be added in the middle of the extruder. The oil is also available from the beginning of the extruder
Alternatively, it may be added in the middle, or may be added separately at the beginning and in the middle. A part of the ethylene / α-olefin copolymer and the propylene resin may be added in the middle of the extruder. When heated and melted and kneaded in an extruder, the copolymer, a radical initiator and a crosslinking assistant undergo a crosslinking reaction, and furthermore, an oil or the like is added and melt-kneaded, whereby the crosslinking reaction and kneading dispersion are sufficiently performed. After that, take out from the extruder. Pellets can be obtained to obtain pellets of the thermoplastic elastomer composition of the present invention.

The degree of crosslinking is defined as a measure of the crosslinkability of the composition. 0.5 g of the thermoplastic elastomer composition of the present invention
Is refluxed for 4 hours in 200 ml of xylene. The solution is filtered with a filter paper for quantification, the residue on the filter paper is vacuum-dried, quantified, and calculated as the ratio (%) of the weight of the residue to the weight of (A) and (C) in the composition.

The crosslinking degree of the thermoplastic elastomer composition of the present invention is desirably 30% or more. If it is less than 30%, the crosslinking is insufficient, and the physical properties such as heat resistance such as compression set and oil resistance are reduced.

[0052]

The present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. In these examples and comparative examples, the test methods used for evaluating various physical properties are as follows.

(1) Surface Hardness Four sheets having a thickness of 2 mm were piled up and evaluated according to ASTM D2240 using a type A or a type D under a 23 ° C. atmosphere.

(2) Tensile breaking strength [kgf / cm ² ] Evaluated at 23 ° C. according to JIS K6251.

(3) Tensile Elongation at Break [%] Evaluated at 23 ° C. according to JIS K6251.

(4) Weather resistance Using a carbon arc type sunshine weather meter (manufactured by Suga Test Instruments Co., Ltd.), according to ASTM D1499, a black panel temperature of 63 ° C., a rainfall time of 18 minutes and an irradiation time of 120 were used.
And the tensile elongation retention [%] after continuously exposing the 2 mm thick compression molded sheet for 500 hours.

(5) Compression set (C-Set) [%] Evaluation was made at 70 ° C. for 22 hours according to JIS K6301.

The following components were used in Examples and Comparative Examples.

(A) Ethylene / α-olefin copolymer Copolymer of ethylene and octene-1 (referred to as EOR) Composition of ethylene / octene-1 of a copolymer produced by a method using a metallocene catalyst Ratio: 75/25 (weight ratio), density: 0.87 g / cm ³ , MFR: 0.5 (1
90 ° C. × 2.16 kg), Mw / Mn = 2.3, has a long chain branch, and has a DSC melting point peak.

Ethylene-propylene-ethylidene norbornene copolymer (referred to as EPDM) It was produced by a method using a Ziegler catalyst. Propylene content: 28% by weight, iodine value 15, density: 0.8
7 g / cm 3, MFR; 0.4 (190 ° C. × 2.16 k
g), having no long-chain branching and no DSC melting point peak.

(B) Propylene resin Polypropylene (referred to as PP) Homo isotactic polypropylene, MFR15
(230 ° C. × 2.16 kg) (C) Block copolymer Block copolymer (referred to as COP-1) Styrene having an ABA structure, a styrene content of 20% by weight and a number average molecular weight of 35,000 Butadiene-styrene block copolymer, ASTM D1238 melt index (190 ° C, 2.16 kg) 3.5, ASTM
D2240 hardness (type A) 62 block copolymer (referred to as COP-2) having an ABA structure, a styrene content of 30% by weight, a number average molecular weight of 60000, and a hydrogenation rate of the polybutadiene portion of 55% Styrene-butadiene-styrene block copolymer, ASTM D1238 Melt Index (2
30 ° C, 2.16 kg) 0.8, ASTM D2240
Hardness (Type A) 80 (d) Softener Paraffin oil (referred to as MO) Diana Process Oil PW-90 (Idemitsu Kosan Co., Ltd.)
(E) Radical generator (referred to as POX) 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne-3 (f) Crosslinking aid divinylbenzene (referred to as DVB) -5, Comparative Examples 1-4 As a extruder, a twin-screw extruder (L / D = 47) having an inlet at the center of the barrel was used. A double screw having a kneading part by a kneading disk before and after the injection port was used as the screw.

A predetermined amount of an ethylene / α-olefin copolymer, a propylene-based resin, and a block copolymer were first melt-kneaded with a twin-screw extruder (cylinder temperature: 220 ° C.) to form pellets. Next, POX and DVB were adhered to the pellets, and the pellets were again poured into the extruder (cylinder temperature 220).
C) from the hopper. MO was added from the injection port at the center of the barrel, melt kneading and crosslinking reaction were performed, and the mixture was pelletized to prepare a thermoplastic elastomer composition.

From the elastomer composition thus obtained, a sheet having a thickness of 2 mm was prepared by compression molding at 200 ° C., and various physical properties were evaluated.

Table 1 shows the results.

[0065]

[Table 1]

In each of the examples, the mechanical strength, weather resistance, and the like were superior to those of the comparative examples to which no block copolymer was added.
The degree of cross-linking and compression set were satisfactory, and the physical properties were excellent.

[0067]

The molded article made of the thermoplastic elastomer composition of the present invention is flexible, has a rubber-like or leather-like appearance, and has excellent mechanical properties, etc., and is an alternative to crosslinked rubber and soft polyvinyl chloride. It can be used effectively as a material.

The present invention relates to an automobile interior / exterior part such as an instrument panel, a lamp end rubber, a console box, a shift knob grip, a home appliance, a weak electric appliance housing, various grips, various switches, various key tops, a wire covering material, a hose, It can be widely used for civil engineering construction materials such as waterproof sheets, gaskets, cushioning materials, rubber feet, shoe soles, etc., and plays a large role in the industrial world.

Continued on the front page F term (reference) 4F070 AA06 AA13 AA15 AA17 AB08 AC56 AE08 GA05 4J002 BB05W BB11X BB12X BB14X BB15X BP01Y EK026 EK027 EK037 EK047 EK057 FD020 FD140 GC00 GL00 GN00 G00G

Claims (3)

[Claims] (A) ethylene and α- having 6 to 12 carbon atoms
1 to 99 parts by weight of an ethylene / α-olefin copolymer produced using a metallocene-based catalyst composed of an olefin and (B) 99 to 1 part by weight of a propylene-based resin (the total amount of (A) and (B) is 100 Parts by weight] and (C) at least one
Block A mainly composed of vinyl aromatic compounds
A thermoplastic elastomer composition obtained by partially or completely cross-linking a mixture of 3 to 90 parts by weight of a block copolymer consisting of and a polymer block B mainly composed of at least one conjugated diene compound. 2. The thermoplastic elastomer composition according to claim 1, wherein the conjugated diene compound is butadiene. 3. A method according to claim 1, wherein (A) a part by weight of the ethylene / α-olefin copolymer comprises (C) a polymer block A mainly composed of at least one vinyl aromatic compound and at least one conjugated diene compound. 3. The thermoplastic elastomer composition according to claim 2, wherein the amount is larger than part by weight of the block copolymer comprising the polymer block B. 3.