JPH11293072A - Thermoplastic elastomer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide thermoplastic elastomer compositions with improved tensile properties and mar resistance. SOLUTION: Desired thermoplastic elastomer compositions comprise (A) 10-85 wt.% styrenic resin and (B) 15-90 wt.% aromatic vinyl/olefin random copolymer having an aromatic vinyl content of 1 to less than 99.9 mol.% and a head-to-tail chain structure of two or more aromatic vinyl compound units and can be obtained by the dynamic vulcanization method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aromatic vinyl compound / olefin thermoplastic elastomer composition, and more particularly, to a crosslinked product obtained by a dynamic vulcanization method which has excellent surface scratch resistance and tensile properties. The present invention relates to an aromatic vinyl compound / olefin thermoplastic elastomer composition.

[0002]

2. Description of the Related Art Olefin-based thermoplastic elastomers have begun to be widely used as energy-saving and resource-saving elastomers, especially as substitutes for vulcanized rubber and soft PVC, for automobile parts, industrial machine parts, building materials and the like. Olefin thermoplastic elastomers are widely known,
For example, JP-B-53-21021 and JP-B-54-2
662, JP-B-55-18448, JP-B-56-15740, and the like. However, although olefin-based thermoplastic elastomers are superior in processability and production cost to conventional vulcanized rubbers, for example, SBR and CR, they are inferior in tensile properties and surface scratch resistance, and are insufficient. Therefore, the appearance of an olefin-based thermoplastic elastomer excellent in tensile properties and surface scratch resistance has been desired.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems associated with the prior art as described above. An object of the present invention is to provide an aromatic vinyl compound / olefin-based thermoplastic elastomer composition with improved disadvantages.

[0004]

The aromatic vinyl compound / olefin thermoplastic elastomer composition according to the present invention comprises (A) 10 to 85% by weight of a styrene resin and the following (B) an aromatic vinyl compound: A crosslinked aromatic vinyl compound / olefin thermoplastic elastomer composition comprising 15 to 90% by weight of an olefin random copolymer and obtained by a dynamic vulcanization method. (B) The aromatic vinyl compound-olefin random copolymer has an aromatic vinyl compound content of 1 to less than 99.9 mol% and has a head-tail chain structure of two or more aromatic vinyl compound units. Aromatic vinyl compound-
It is an olefin random copolymer.

The aromatic vinyl compound-olefin random copolymer (B) of the present invention is preferably an aromatic vinyl compound-ethylene random copolymer. Further, the aromatic vinyl compound-olefin random copolymer (B) of the present invention has an aromatic vinyl compound content of 1 to less than 99.9 mol%, preferably 1 to 50 mol%, and two or more aromatic vinyl compounds. It is an aromatic vinyl compound-olefin random copolymer having a head-tail chain structure of an aromatic vinyl compound unit. This aromatic vinyl compound-olefin random copolymer is a novel copolymer, and includes an aromatic vinyl compound-ethylene random copolymer obtained by using the following transition metal compound or by the following production method. It is not particularly limited to the transition metal compound or the production method of the present invention.

Hereinafter, a styrene-ethylene random copolymer which is an example of the copolymer of the present invention will be described. Its structure is determined by nuclear magnetic resonance (NMR).

[0007] The styrene-ethylene random copolymer of the present invention has main peaks at the following positions in 13C-NMR based on TMS. Peaks derived from main chain methylene and main chain methine carbon around 24 to 25 ppm,
Around 27 ppm, around 30 ppm, around 34 to 37 ppm, around 40 to 41 ppm, and around 42 to 46 ppm, and peaks derived from five carbons which are not bonded to the polymer main chain among phenyl groups are around 126 ppm and 128 ppm. The peak derived from one of the phenyl groups bonded to the polymer main chain is 146p
It is shown near pm. The styrene-ethylene random copolymer of the present invention has the following general formula (1) contained in its structure.
Wherein the stereoregularity of the phenyl group of the alternating structure of styrene and ethylene is greater than 0.75 in isotactic dyad fraction m, and the alternating structure index λ given by the following formula (i) is less than 70. It is a styrene-ethylene random copolymer greater than 1, preferably less than 70 and greater than 5. λ = A3 / A2 × 100
Formula (i) Here, A3 is the sum of the areas of three types of peaks a, b, and c derived from a styrene-ethylene alternating structure represented by the following general formula (1 ′) and obtained by 13 C-NMR measurement. is there. A2 is 1 based on TMS.
It is the total area of peaks derived from main chain methylene and main chain methine carbon observed in the range of 0 to 50 ppm by 3C-NMR.

[0008]

Embedded image

(In the formula, Ph represents a phenyl group, x represents the number of repeating units, and represents an integer of 2 or more.)

[0010]

Embedded image

(In the formula, Ph represents a phenyl group, x represents the number of repeating units, and represents an integer of 2 or more.)

In the styrene-ethylene random copolymer of the present invention, the stereoregularity of the phenyl group of the alternating copolymer structure of ethylene and styrene is defined as the isotactic structure.
It refers to a structure in which the isotactic diad fraction m (or also referred to as meso diad fraction) is larger than 0.75, preferably 0.85 or more, more preferably 0.95 or more.

The isotactic dyad fraction m of the alternating copolymer structure of ethylene and styrene is calculated from the peak area Ar derived from the r structure of the methylene carbon peak appearing at about 25 ppm and the peak area Am derived from the m structure. , Can be obtained by the following equation (ii). m = Am / (Ar + Am) Formula (ii) The appearance position of the peak may be slightly shifted depending on the measurement conditions and the solvent. For example, using deuterated chloroform as a solvent,
Based on TMS, the peak derived from the r structure is
The peak derived from the m-structure appears around 25.4 to 25.5 ppm, and around 25.2 to 25.3 ppm. Also,
When heavy tetrachloroethane is used as a solvent and the center peak (73.89 ppm) of the triplet of heavy tetrachloroethane is used as a reference, the peak derived from the r structure is 25.3 to 2
Around 5.4 ppm, the peak derived from the m-structure was 25.
Appears around 1-25.2 ppm. Note that the m structure represents a meso diad structure, and the r structure represents a racemic diad structure. In the styrene-ethylene random copolymer of the present invention, the peak attributed to the r structure in the alternating copolymer structure of ethylene and styrene is not substantially observed.

Further, in the styrene-ethylene random copolymer of the present invention, the stereoregularity of the phenyl group in the chain structure of the styrene unit is isotactic. Isotacticity of the stereoregularity of the phenyl group in the styrene unit chain structure is defined as isotactic dyad fraction ms
(Or also referred to as meso dyad fraction) is greater than 0.5, preferably 0.7 or more, more preferably 0.8
This refers to the structure described above. The stereoregularity of the chain structure of the styrene unit is 43 to 43 observed by 13C-NMR.
Peak position of methylene carbon around 44 ppm, and 1H
-Determined by the peak position of the main chain proton observed by NMR.

According to US Pat. No. 5,502,133,
The methylene carbon of the isotactic polystyrene chain structure appears at 42.9 to 43.3 ppm, while the methylene carbon of the syndiotactic polystyrene chain structure is 44.0.
Appears around ４４44.7 ppm. The appearance positions of the sharp methylene carbon of syndiotactic polystyrene and the broad peak of 43 to 45 ppm of atactic polystyrene are close to the positions of the relatively low intensity peaks of the other carbons of the styrene-ethylene random copolymer of the present invention. Or they overlap. However, in the present invention, 42.
Compared to the strong observation of the methylene carbon peak at 9 to 43.4 ppm, no clear peak is observed around 44.0 to 44.7 ppm.

Further, according to US Pat. No. 5,502,133 and a comparative example of the present invention, the peaks attributed to the main chain methylene and methine protons in 1H-NMR are 1.5 to 1.6 ppm in the case of isotactic polystyrene.
2.2 to 2.3 ppm, and in the case of syndiotactic polystyrene, 1.3 to 1.4 ppm, 1.8 to 1.9 p
pm. In the copolymer of the present invention, peaks are observed at 1.5 to 1.6 ppm and 2.2 ppm, and the result of this NMR analysis indicates that the styrene chain in the copolymer of the present invention has an isotactic stereoregularity. Sexuality.

The isotactic dyad fraction ms of the chain structure of the styrene unit is determined by 13C-NMR measurement of methylene carbon or 1H-NMR of the styrene chain structure.
The following formula is derived from each peak of the main chain methylene and methine protons measured. Peak area Ar ′ derived from the syndiotactic dyad structure (r structure) of each peak
And the area Am ′ of the peak derived from the isotactic dyad structure (m structure) can be determined by the following formula (iii). ms = Am ′ / (Ar ′ + Am ′) Formula (iii) The appearance position of the peak may be slightly shifted depending on the measurement conditions and the solvent.

The random copolymer in the present invention is a chain structure linked by a head-tail of styrene units,
It is a copolymer containing a chain structure in which ethylene units are bonded and a structure in which styrene units and ethylene units are bonded. The proportion of these structures in the present copolymer varies depending on the styrene content or the polymerization conditions such as the polymerization temperature. The lower the styrene content, the lower the percentage of head-tail linked styrene units in the styrene unit. For example, if the styrene content is about 20
In the case of a copolymer having a mol% or less, a chain structure linked by a head-tail of a styrene unit has ordinary 13C-NMR.
In measurement, it is difficult to directly observe a peak derived from the structure. However, a homopolymer having high activity and stereoregularity in the polymerization of styrene alone can be produced by using the transition metal compound of the present invention or by the production method of the present invention, that is, a head-tail of essentially styrene units. And, in the copolymer, a chain linked by a head-tail of styrene units corresponding to a styrene content of 20 to 99 mol% by at least 13C-NMR method. Since the proportion of the structure changes continuously,
It is clear that even if the amount is less than 20 mol%, a small amount of a styrene unit head-tail linked chain structure may be present in the copolymer. It is possible to observe the chain structure linked by the head-tail of styrene units in a copolymer having a styrene content of 20 mol% or less by means of 13C-NMR analysis using a styrene monomer enriched with 13C. is there. The same applies to the chain structure of ethylene units.

The chain structure linked by the head-tail of the styrene units contained in the (B) styrene-ethylene random copolymer of the present invention is two or more chain structures represented by the following structures. It is preferable to have at least two chain structures.

[0020]

Embedded image

Here, n is an arbitrary integer of 2 or more. Ph is a phenyl group.

On the other hand, in the case of a conventionally known pseudo-random copolymer, a head-tail chain structure of an aromatic vinyl compound cannot be found even when the content of the aromatic vinyl compound is around the maximum of 50 mol%. Furthermore, even if homopolymerization of an aromatic vinyl compound is attempted using a catalyst for producing a pseudorandom copolymer, a polymer cannot be obtained. A very small amount of an atactic aromatic vinyl compound homopolymer may be obtained depending on polymerization conditions, etc., which is different from that formed by cationic polymerization by coexisting methylalumoxane or alkylaluminum mixed therein, or by radical polymerization. Should understand.

The peak of the methylene carbon of the structure derived from the hetero-bond of styrene in the conventional pseudorandom copolymer having no stereoregularity is 34.0 to 34.5 ppm and 34.5.
It is known to be in two regions of ~ 35.2 ppm. (For example, Polymer Preprints,
Japan, 42 , 2292 (1993)) In the styrene-ethylene random copolymer of the present invention, a peak attributed to a methylene carbon of a heterogeneous bond structure derived from styrene is observed in a region of 34.5 to 35.2 ppm. But 3
It is hardly observed at 4.0 to 34.5 ppm. This indicates one of the features of the copolymer of the present invention, and indicates that the styrene group has a high stereoregularity even in a heterogeneous bond structure derived from styrene as shown in the following formula.

[0024]

Embedded image

Further, the styrene-ethylene random copolymer of the present invention has an ethylene-styrene alternating structure having high stereoregularity and simultaneously an ethylene chain of various lengths, a hetero-bond of styrene, a styrene chain and the like. It has the feature of having various structures. Further, the styrene-ethylene random copolymer of the present invention can variously change the ratio of the alternating structure depending on the content of styrene in the copolymer in a range of greater than 1 and less than 70 in the λ value obtained by the above formula. is there. Since this stereoregular alternating structure is a crystallizable structure, the copolymer of the present invention can be made crystalline, non-crystalline, by controlling the degree of crystallinity by the content of styrene or by an appropriate method. It is possible to provide various properties such as a polymer having a partially crystalline structure. When the λ value is less than 70, it is a crystalline polymer, in order to provide significant toughness and transparency, and to become a partially crystalline polymer, or to become a non-crystalline polymer. Important for. The copolymer of the present invention has a styrene content of about 10 mol% or more,
Compared with the conventional styrene-ethylene copolymer having no stereoregularity and having no styrene chain, a higher melting point (DS
C).

The method for producing the aromatic vinyl compound / olefin random copolymer (B) used in the aromatic vinyl compound / olefin thermoplastic elastomer composition of the present invention will be described below. The aromatic vinyl compound-olefin random copolymer (B) used in the present invention can be produced using the following transition metal compound.

[0027]

Embedded image

In the formula, A is an unsubstituted or substituted indenyl group, or an unsubstituted or substituted benzoindenyl group. B is an unsubstituted or substituted cyclopentadienyl group,
Unsubstituted or substituted indenyl group, unsubstituted or substituted benzoindenyl group, or unsubstituted or substituted fluorenyl group. When both A and B are unsubstituted or substituted indenyl groups or unsubstituted or substituted benzoindenyl groups, they may be the same or different. Y is
It has a bond with A and B, and has hydrogen or carbon number 1 as a substituent.
A methylene group or a silylene group having from 15 to 15 hydrocarbon groups. These substituents may be different or the same. Further, Y may have a cyclic structure such as a cyclohexylidene group and a cyclopentylidene group. X is
Halogen such as hydrogen, chlorine and bromine, alkyl group such as methyl group and ethyl group, aryl group such as phenyl group, silyl group such as trimethylsilyl group, alkoxy group such as methoxy group, ethoxy group and isopropoxy group or dialkylamide group And so on. M is a Group IV metal.

In the general formula (2), A is preferably an unsubstituted or substituted indenyl group represented by the following general formula, Chemical formula 9, Chemical formula 11, Chemical formula 11 or Chemical formula 12, or an unsubstituted or substituted benzoindenyl. Group.

[0030]

Embedded image

[0031]

Embedded image

[0032]

Embedded image

[0033]

Embedded image

In the above Chemical Formulas 9 to 12, R1, R
2, R3 and R4 are each hydrogen, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 10 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, a halogen atom, an OSiR ₃ group, a SiR ₃ group or a PR ₂ group (R is All represent hydrocarbon groups having 1 to 10 carbon atoms), and R1s, R2s, R3s and R4s may be the same or different. Further, adjacent R1, R2, R3 and R4 may be combined to form a 5- to 8-membered aromatic or aliphatic ring.

The unsubstituted indenyl group is 1-indenyl, and the substituted indenyl group is 4-alkyl-1-
Indenyl, 4-aryl-1-indenyl, 4,5-
Dialkyl-1-indenyl, 4,6-dialkyl-1
-Indenyl, 5,6-dialkyl-1-indenyl,
4,5-diaryl-1-indenyl, 5-aryl-
1-indenyl, 4-aryl-5-alkyl-1-indenyl, 2,6-dialkyl-4-aryl-1-indenyl, 5,6-diaryl-1-indenyl, 4,
5,6-triaryl-1-indenyl and the like. As an unsubstituted benzoindenyl group, 4,5-benzo-1-indenyl, (also called benzo (e) indenyl), 5,6-benzo-1-indenyl and 6,7-benzo-1-indenyl are substituted. As the benzoindenyl group, 4,5-naphth-1-indenyl, 4,5-pyrene-1-indenyl, 4,5-triphenylene-1-indenyl, α-acenaphth-1-indenyl, 3-cyclopenta [c] Phenanthryl, 1-cyclopenta [l]
Examples thereof include a phenanthryl group.

In the above general formula (2), B is preferably the same unsubstituted or substituted indenyl group or unsubstituted or substituted benzoindenyl group as in the above A, or the following general formulas 13 and 14. An unsubstituted or substituted cyclopentadienyl group or an unsubstituted or substituted fluorenyl group. When both A and B are unsubstituted or substituted indenyl groups or unsubstituted or substituted benzoindenyl groups, they may be the same or different.

[0037]

Embedded image

[0038]

Embedded image

In the above Chemical Formulas 13 and 14, R5, R
6 is hydrogen, an alkyl group having 1 to 20 carbon atoms,
10 aryl groups, 7 to 20 alkylaryl groups, halogen atoms, OSiR ₃ groups, SiR ₃ groups, or PR ₂ groups (R represents a hydrocarbon group having 1 to 10 carbon atoms); R6s may be the same or different from each other. However, it is preferable that B has a steric relationship with A in a racemic (or pseudo-racemic) form.

Cyclopentadienyl as an unsubstituted cyclopentadienyl group and 4-aryl-1-cyclopentadienyl, 4,5- as a substituted cyclopentadienyl group
Diaryl-1-cyclopentadienyl, 5-alkyl-4-aryl-1-cyclopentadienyl, 4-alkyl-5-aryl-1-cyclopentadienyl, 4,
5-Dialkyl-1-cyclopentadienyl, 5-trialkylsilyl-4-alkyl-1-cyclopentadienyl, 4,5-dialkylsilyl-1-cyclopentadienyl and the like can be mentioned.

As the unsubstituted indenyl group or substituted indenyl group, unsubstituted benzoindenyl group or substituted benzoindenyl group, those exemplified for A above can be used. Examples of the unsubstituted fluorenyl group include a 9-fluorenyl group, and examples of the substituted fluorenyl group include a 7-methyl-9-fluorenyl group and a benzo-9-fluorenyl group.

In the above general formula (2), Y is A, B
And a hydrogen or hydrocarbon group having 1 to 15 carbon atoms
Or a methylene group or a silylene group. Substituent
May be different from each other or the same. Y is Shik
Cyclic structures such as rohexylidene and cyclopentylidene
May be provided. Preferably, Y is bonded to A, B
Having hydrogen or a hydrocarbon group having 1 to 15 carbon atoms
Substituted methylene group. As a hydrocarbon substituent
Represents an alkyl group, an aryl group, a cycloalkyl group,
And a loaryl group. The substituents are different from each other
Or the same. Particularly preferably, Y is -CH_Two
-, -CMe_Two-, -CEt_Two-, -CPh _Two-, Shiku
Rohexylidene, cyclopentylidene group and the like. here
Where Me is a methyl group, Et is an ethyl group, and Ph is phenyl.
Represents a group. X represents hydrogen, halogen, an alkyl group having 1 to 15 carbon atoms.
Alkyl group, aryl group having 6 to 10 carbon atoms, 1 to 4 carbon atoms
A silyl group having a hydrocarbon substituent of 1 to 10 carbon atoms
An alkoxy group or an alkyl substituent having 1 to 6 carbon atoms
Dialkyl amide group. Salt as halogen
And bromine are alkyl groups such as methyl and ethyl.
And the aryl group is a phenyl group and the like,
Trimethylsilyl group, etc.
Methoxy group, ethoxy group, isopropoxy group, etc.
Examples of the dialkylamide group include a dimethylamide group and the like.
Can be

M is a Group IV metal, Zr, Hf, T
i and the like. Particularly preferred is Zr.

Examples of such transition metal compounds include the following compounds. For example, dimethylmethylenebis (1-indenyl) zirconium dichloride, diethylmethylenebis (1-indenyl) zirconium dichloride, di-n-propylmethylenebis (1-indenyl) zirconium dichloride, di-propylmethylenebis (1-indenyl) zirconium Dichloride, cyclohexylidenebis (1-indenyl) zirconium dichloride, cyclopentylidenebis (1-indenyl) zirconium dichloride, diphenylmethylenebis (1-indenyl) zirconium dichloride, dimethylmethylenebis (4,5-benzo-1-indenyl) Zirconium dichloride {also known as dimethylmethylenebis (benzo [e] indenyl) zirconium dichloride}, di-n-
Propylmethylenebis (4,5-benzo-1-indenyl) zirconium dichloride, dii-propylmethylenebis (4,5-benzo-1-indenyl) zirconium dichloride, cyclohexylidenebis (4,5-benzo-1- (Indenyl) zirconium dichloride, cyclopentylidenebis (4,5-benzo-1-indenyl) zirconium dichloride, diphenylmethylenebis (4
5benzo-1-indenyl) zirconium dichloride,
Dimethylmethylene (cyclopentadienyl) (4,5-
Benzo-1-indenyl) zirconium dichloride, dimethylmethylene (1-indenyl) (4,5-benzo-
1-indenyl) zirconium dichloride, dimethylmethylene (1-fluorenyl) (4,5-benzo-1-indenyl) zirconium dichloride, dimethylmethylene (4-phenyl-1-indenyl) (4,5-benzo-
1-indenyl) zirconium dichloride, dimethylmethylene (4-naphthyl-1-indenyl) (4,5-benzo-1-indenyl) zirconium dichloride, dimethylmethylenebis (5,6-benzo-1-indenyl)
Zirconium dichloride, dimethylmethylene (5,6-
Benzo-1-indenyl) (1-indenyl) zirconium dichloride, dimethylmethylenebis (6,7-benzo-1-indenyl) zirconium dichloride, dimethylmethylene (6,7-benzo-1-indenyl) (1-
Indenyl) zirconium dichloride, dimethylmethylenebis (4,5-naphth-1-indenyl) zirconium dichloride, dimethylmethylenebis (α-acenaphth-1-indenyl) zirconium dichloride, dimethylmethylenebis (3-cyclopenta [c] phenanthryl) zirconium Dichloride, dimethylmethylene (3-
Cyclopenta [c] phenanthryl) (1-indenyl) zirconium dichloride, dimethylmethylenebis (1-cyclopenta [l] phenanthryl) zirconium dichloride, dimethylmethylene (1-cyclopenta [l] phenanthryl) (1-indenyl) zirconium dichloride, dimethylmethylene Bis (4,5-benzo-1-indenyl) zirconium bis (dimethylamide) and the like. The Zr complex has been exemplified above.
The same compounds as described above are preferably used for the i and Hf complexes. A mixture of a racemic body and a meso body may be used, but a racemic body or a pseudo racemic body is preferably used.
In these cases, a D-form or an L-form may be used.

As the cocatalyst used in the present invention, a cocatalyst conventionally used in combination with a transition metal compound can be used. As such a cocatalyst, aluminoxane (or alumoxane) or boron is used. Compounds are preferably used. Further, in the present invention, an aluminoxane (or alumoxane) represented by the following general formulas (3) and (4) is preferably used as a co-catalyst at that time.

[0046]

Embedded image

In the formula, R is an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 10 carbon atoms, or hydrogen, and m is 2 to 10
It is an integer of 0. Each R may be the same or different.

[0048]

Embedded image

In the formula, R ′ is an alkyl group having 1 to 5 carbon atoms,
An aryl group having 6 to 10 carbon atoms or hydrogen, and n is 2 to 1
It is an integer of 00. Each R 'may be the same or different. As the aluminoxane, methylalumoxane, ethylalumoxane, and triisobutylalumoxane are preferably used, and particularly preferably, methylalumoxane is used. If necessary, a mixture of these different alumoxanes may be used. These alumoxanes may be used in combination with alkylaluminums, for example, trimethylaluminum, triethylaluminum, triisobutylaluminum, and alkylaluminums containing halogen, for example, dimethylaluminum chloride.

The addition of the alkylaluminum is effective for removing a polymerization inhibitor such as a polymerization inhibitor in styrene, styrene, water in a solvent, and other substances that inhibit polymerization, and rendering the polymerization reaction harmless. However, the amount of alumoxane used or the amount of alumoxane used is reduced by a known method such as distillation of styrene or a solvent in advance, or bubbling with a dry inert gas or passing through a molecular sieve. It is not always necessary to add alkyl aluminum at the time of polymerization, if it is slightly increased or added.

In the present invention, a boron compound can be used as a promoter together with the above transition metal compound. Boron compounds used as cocatalysts include triphenylcarbenium tetrakis (pentafluorophenyl) borate {trityltetrakis (pentafluorophenyl) borate} and lithium tetra (pentafluorophenyl)
Borate, tri (pentafluorophenyl) borane, trimethylammonium tetraphenylborate, triethylammonium tetraphenylborate, tripropylammonium tetraphenylborate, tri (n-butyl) ammonium tetraphenylborate, tri (n
-Butyl) ammonium tetra (p-tolyl) phenyl borate, tri (n-butyl) ammonium tetra (p
-Ethylphenyl) borate, tri (n-butyl) ammonium tetra (pentafluorophenyl) borate,
Trimethylammonium tetra (p-tolyl) borate, trimethylammonium tetrakis-3,5-dimethylphenylborate, triethylammonium tetrakis-3,5-dimethylphenylborate, tributylammonium tetrakis-3,5-dimethylphenylborate, tributylammonium tetrakis- 2,4-
Dimethylphenyl borate, anilinium tetrakispentafluorophenyl borate, N, N′-dimethylanilinium tetraphenyl borate, N, N′-dimethylanilinium tetrakis (p-tolyl) borate,
N, N'-dimethylanilinium tetrakis (m-tolyl) borate, N, N'-dimethylanilinium tetrakis (2,4-dimethylphenyl) borate, N, N '
-Dimethylanilinium tetrakis (3,5-dimethylphenyl) borate, N, N′-dimethylanilinium tetrakis (pentafluorophenyl) borate, N,
N'-diethylanilinium tetrakis (pentafluorophenyl) borate, N, N'-2,4,5-pentamethylanilinium tetraphenylborate, N, N '
-2,4,5-pentaethylanilinium tetraphenyl borate, di- (isopropyl) ammonium tetrakispentafluorophenyl borate, di-cyclohexylammonium tetraphenyl borate, triphenylphosphonium tetraphenyl borate, tri (methylphenyl) phosphonium tetraphenyl Borate, tri (dimethylphenyl) phosphonium tetraphenyl borate, triphenylcarbenium tetrakis (p-tolyl) borate, triphenylcarbenium tetrakis (m-tolyl) borate, triphenylcarbenium tetrakis (2,4-dimethylphenyl) borate , Triphenylcarbenium tetrakis (3,5-dimethylphenyl) borate, tropylium tetrakispentafluorophenyl volley , Tropylium tetrakis (p-
Tolyl) borate, tropylium tetrakis (m-tolyl) borate, tropylium tetrakis (2,4-dimethylphenyl) borate, tropylium tetrakis (3, 5-dimethylphenyl) borate and the like. These boron compounds and the above-mentioned organoaluminum compounds may be used simultaneously. In particular, when a boron compound is used as a co-catalyst, the addition of an alkyl aluminum compound such as triisobutyl aluminum is effective for removing impurities such as water contained in the polymerization system that adversely affect the polymerization.

The aromatic vinyl compound used in the present invention includes styrene and various substituted styrenes such as p
-Methylstyrene, m-methylstyrene, o-methylstyrene, ot-butylstyrene, mt-butylstyrene, pt-butylstyrene, p-chlorostyrene,
Examples thereof include o-chlorostyrene, α-methylstyrene, and the like, and compounds having a plurality of vinyl groups in one molecule such as divinylbenzene. Industrially, styrene, p-methylstyrene and p-chlorostyrene are preferably used, and styrene is particularly preferably used.

The olefin used in the present invention is an α-olefin having 2 to 20 carbon atoms, that is, ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and cyclic olefin. Olefin,
That is, norbornene and norbornadiene are suitable. Two or more of these olefins may be used.
As the olefin, ethylene and propylene are preferable.

In producing the copolymer of the present invention, an olefin, an aromatic vinyl compound exemplified above,
The transition metal compound, which is a metal complex, and the cocatalyst are brought into contact with each other, and the order of contact and the contact method may be any known method. As the polymerization method, a method of polymerizing in a liquid monomer without using a solvent, or a saturated aliphatic or pentane, hexane, heptane, cyclohexane, benzene, toluene, xylene, chloro-substituted benzene, chloro-substituted toluene, methylene chloride, chloroform or the like There is a method using a single or mixed solvent of aromatic hydrocarbons or halogenated hydrocarbons. If necessary, a method such as batch polymerization, continuous polymerization, batch polymerization, slurry polymerization, preliminary polymerization, or gas phase polymerization can be used.

[0055] The polymerization temperature is suitably from -78 ° C to 200 ° C, preferably from -50 ° C to 160 ° C. -78
Polymerization temperatures below ℃ are industrially disadvantageous, and above 200 ℃ are not suitable because decomposition of the metal complex takes place. More preferably, it is 0 ° C to 160 ° C industrially.

When an organoaluminum compound is used as a cocatalyst, an aluminum atom /
The complex metal atom ratio is 0.1 to 100,000, preferably 1
It is used in a ratio of 0-10000. If it is less than 0.1, the metal complex cannot be activated effectively, and if it exceeds 100,000, it is economically disadvantageous. When a boron compound is used as a cocatalyst, a boron atom / complex metal atom ratio of 0.01
To 100, preferably 0.1 to 1
0, particularly preferably 1, is used. If it is less than 0.01, the metal complex cannot be activated effectively, and if it exceeds 100, it is economically disadvantageous. The metal complex and the cocatalyst may be mixed and prepared outside the polymerization tank, or may be mixed in the tank during polymerization.

The weight average molecular weight of the aromatic vinyl compound-olefin random copolymer (B) used in the present invention is 1000 or more, preferably 10,000 or more, and particularly preferably, in consideration of the physical properties of the copolymer. More than 30,000. Here, the weight average molecular weight refers to a molecular weight in terms of polystyrene obtained by using GPC with standard polystyrene. The aromatic vinyl compound-olefin random copolymer (B) used in the present invention does not necessarily have to be a pure copolymer, but may have another structure if its structure and stereoregularity are within the above ranges. Even if it is contained, other monomers may be copolymerized. Other monomers to be copolymerized include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene,
-Methylpentene-1 and the like, and α-olefins having 3 to 20 carbon atoms, conjugated dienes such as butadiene, and non-conjugated diene compounds such as ethylidene norbornene, dicyclopentadiene and 1,4-hexadiene. Further, two or more aromatic vinyl compounds may be copolymerized. Also, depending on polymerization conditions, etc.
A small amount of an atactic homopolymer obtained by thermally, radically or cationically polymerizing an aromatic vinyl compound may be contained, but the amount is 10% by weight or less of the whole. Such a homopolymer can be removed by solvent extraction, but if there is no particular problem in physical properties, it can be used while containing it.

Specific examples of the styrene resin (A) used in the present invention include styrene homopolymer, styrene and 3
0 mol% or less of a copolymer with any one or more of α-olefins, vinyl acetate and vinyl monomers such as ethyl acrylate, styrene, and 30 mol% or less of AN,
MMA, copolymer with any one or more of divinylbenzene and α-methylstyrene, HI type polystyrene, SBS and hydrogenated product thereof (SEBS),
, SIS and its hydrogenated products (SEPS), SB
And hydrogenated products of R. Among the above styrene resins, styrene homopolymer, SBS and its hydrogenated product, SIS and its hydrogenated product are particularly preferred. The styrene resin (A) as described above can be used alone or in combination.

Further, for the purpose of improving the physical properties of the present thermoplastic elastomer, blending with another polymer is also possible.
For example, polyethylene, polypropylene, PMMA, E
Blends with PDM, butyl rubber and the like can be mentioned.
Also, a blend of aromatic vinyl compound-olefin random copolymers of the present invention having different aromatic vinyl compound contents can be used. These may be reacted with the main component in addition to the dynamic vulcanization reaction, or may be used as a mere blend material after the reaction is completed.

The thermoplastic elastomer composition of the present invention comprises:
So-called dynamic vulcanization (dynamically heat-treating) a blend comprising (A) a styrene-based resin and (B) an aromatic vinyl compound-olefin random copolymer in the presence of an organic peroxide or a phenolic resin crosslinking agent. ) Can be obtained. Dynamic vulcanization is a technique for simultaneously kneading and dispersing various compounds in a molten state by vigorously kneading them under conditions in which a crosslinking agent reacts. Y. See Coran et al. (Rub. Chem. And Technol.
vol. 53, 141 (1980)) and are widely known. The dynamic vulcanization is performed using a closed kneader such as a Banbury mixer or a pressure kneader, a single-screw or twin-screw extruder, or the like. The kneading temperature is usually 130 to 3
00 ° C, preferably 150 to 250 ° C. The kneading time is usually 1 to 30 minutes. Specific examples of organic peroxides used for dynamic vulcanization include dicumyl peroxide,
2,5-dimethyl-2,5-di (tert-butylperoxy) -hexane, 2,5-dimethyl-2,5-di (tert-butylperoxy) -hexyne-3, di-
tert-butyl peroxide and the like. In the present invention, the organic peroxide is used in an amount of preferably 0.1 to 5 parts by weight, more preferably 0.5 to 3 parts by weight, based on 100 parts by weight of the aromatic vinyl compound-olefin random copolymer (B). Can be During dynamic vulcanization with an organic peroxide, a peroxide crosslinking auxiliary such as a maleimide compound and a polyfunctional vinyl monomer such as divinylbenzene and trimethylolpropane trimethacrylate can be blended.

The thermoplastic elastomer of the present invention may contain a mineral oil softener, a heat stabilizer, an antistatic agent, a weather stabilizer, an antioxidant, and a filler, if necessary, as long as the object of the present invention is not impaired. Additives such as agents, coloring agents and lubricants can be added. Examples of softeners that can be added as needed to control the hardness and fluidity of the product include paraffinic, naphthenic, aroma-based process oils, liquid paraffin, castor oil, and linseed oil. Is used. And even if these softeners are added during kneading,
(B) The aromatic vinyl compound-olefin random copolymer may be included in advance at the time of production (so-called oil-extended rubber). In the present invention, the softener is usually added in an amount of 0 to 150 parts by weight based on 100 parts by weight of the aromatic vinyl compound-olefin random copolymer (B). In addition, as the inorganic filler that can be added as required in the thermoplastic elastomer composition of the present invention, specifically, calcium carbonate, talc, clay, calcium silicate, magnesium carbonate, magnesium hydroxide, etc. Is mentioned.

[0062]

Hereinafter, the present invention will be described with reference to examples.
These examples do not limit the invention. In the following description, Ind represents an indenyl group, BInd represents a bensoindenyl group, and Me represents a methyl group. Analysis of the polymer obtained in each experimental example was performed by the following means. The 13C-NMR measurement was performed using a JN Electronics JN
Using MGX-270 or α-500, the solvent was deuterated chloroform or deuterated 1,1,2,2-tetrachloroethane, and the measurement was performed based on TMS. The determination of the styrene content in the polymer was performed by 1H-NMR, and the apparatus was JNMGX-270 or α-500 manufactured by JEOL Ltd.
The solvent used was deuterated chloroform or 1,1,2,2-tetrachloroethane, and the intensity was compared between the peak derived from the phenyl group proton and the proton peak derived from the alkyl group based on TMS. The molecular weight was determined by using GPC (gel permeation chromatography) in terms of standard polystyrene. Solvent is THF or 1,2,4
-Trichlorobenzene is used, and the column is HL manufactured by Tosoh Corporation.
C-8020 or GPC-710 manufactured by Senshu Kagaku
0 was used.

Experimental Example <Synthesis A of transition metal compound> Rac-dimethylmethylenebis (4,5-benzo-1-indenyl) zirconium dichloride represented by the following formula (also known as rac-isopropylidenebis (4,5-benzo- 1-indenyl) zirconium dichloride or rac @ Bind-C (Me) _2-
Bind @ ZrCl ₂ ) was synthesized by the following synthesis method. 4,5-benzoindene is Organometal
rics, 13 , 964 (1994).

A-1 1,1-isopropylidene-4,
Synthesis of 5-benzoindene The synthesis of 1,1-isopropylidene-4,5-benzoindene is described in Can. J. Chem. , 62 , 1751 (1
984), with reference to the synthesis of 6,6-diphenylfulvene. However, acetone was used as a starting material instead of benzophenone, and 4,5-benzoindene was used instead of cyclopentadiene.

A-2 Synthesis of isopropylidenebis 4,5-benzo-1-indene Under an Ar atmosphere, 21 mmol of 4,5-benzoindene was dissolved in 70 ml of THF, and an equivalent amount of BuLi was added at 0 ° C.
Was added and stirred for 3 hours. 1,1-isopropylidene-
THF in which 21 mmol of 4,5-benzoindene is dissolved
Was added and stirred at room temperature overnight. 100 ml of water and 150 ml of diethyl ether were added and shaken. The organic layer was separated, washed with saturated saline, dried over sodium sulfate, and the solvent was distilled off under reduced pressure. The obtained yellow solid was washed with hexane and dried to obtain 3.6 g (46% yield) of isopropylidenebis 4,5-benzo-1-indene. By 1H-NMR spectrum measurement, 7.2 to 8.0 ppm (m, 12
H), 6.65 ppm (2H), 3.75 ppm (4
H) has a peak at 1.84 ppm (6H). The measurement was performed based on TMS using CDCl ₃ as a solvent.

A-3 Synthesis of rac-dimethylmethylenebis (4,5-benzo-1-indenyl) zirconium dichloride Under Ar atmosphere, 7.6 mmol of isopropylidenebis4,5-benzo-1-indene and 7.2 mmol Zirconium tetrakisdimethylamide, also known as ｛Zr (NM
e ₂ ) ₄ ｝ together with 50 ml of toluene, 130
Stirred at C for 10 hours. Under reduced pressure, toluene was distilled off, 100 ml of methylene chloride was added, and the mixture was cooled to -78 ° C. Dimethylamine hydrochloride (14.4 mmol) was slowly added, and the mixture was slowly warmed to room temperature and stirred for 2 hours. After distilling off the solvent,
The obtained solid was washed with pentane and then with a small amount of THF, and 0.84 g of yellow rac-dimethylmethylenebis (4,5-benzo-1-indenyl) zirconium dichloride represented by the following formula was obtained ( (Yield 21%).

[0067]

Embedded image

According to 1H-NMR spectrum measurement, 7.
01 ppm (m, 2H), 7.75 ppm (m, 2H)
H), 7.69 ppm (d, 2H), 7.48-7.5.
8 ppm (m, 4H), 7.38 ppm (d, 2H),
7.19 ppm (d, 2H), 6.26 ppm (d, 2H)
H) It has a peak at 2.42 ppm (s, 6H). The measurement was performed based on TMS using CDCl ₃ as a solvent. Elemental analysis was performed using an elemental analyzer 1108 (manufactured by Fisons, Italy), and C63.86 was used.
%, H 3.98%. Theoretical value is C65.39.
%, H 4.16%.

<Synthesis B of Transition Metal Compound> rac-Dimethylmethylene (1-indenyl) (4,5-benzo-1
-Indenyl) zirconium dichloride (also known as ra
c-isopropylidene (1-indenyl) (4,5-benzo-1-indenyl) zirconium dichloride, or rac @ Ind-C (Me) ₂ -Bind @ ZrCl
₂ ) was synthesized by the following synthesis method.

B-1 Synthesis of isopropylidene (1-indene) (4,5-benzo-1-indene) Under Ar atmosphere, 14 mmol of indene was added to 50 ml of T
Dissolved in HF, added an equivalent of BuLi at 0 ° C., and stirred for 10 hours. 10 ml of THF in which 13 mmol of 1,1-isopropylidene-4,5-benzoindene was dissolved was added, and the mixture was stirred at room temperature overnight. 50 ml of water and 100 ml of diethyl ether were added and the mixture was shaken. The organic layer was separated, washed with saturated saline, dried over sodium sulfate, and the solvent was distilled off under reduced pressure. Further purification with a column, 2.5 g of isopropylidene (1-indene) (4,5-benzo-1-indene)
(59% yield).

B-2 rac-dimethylmethylene (1-
Synthesis of indenyl) (4,5-benzo-1-indenyl) zirconium dichloride 6.5 mmol of isopropylidene (1
-Indene) (4,5-benzo-1-indene) and 6.
5 mmol of zirconium tetrakisdimethylamide,
Another name {Zr (NMe ₂ ) ₄ } was charged together with 40 ml of toluene, and the mixture was stirred at 130 ° C. for 10 hours. Under reduced pressure, toluene was distilled off, and 100 ml of methylene chloride was added.
Cooled to ° C. 13 mmol of dimethylamine hydrochloride was slowly added, and the temperature was slowly raised to room temperature, followed by stirring for 2 hours. After distilling off the solvent, the obtained solid was washed with pentane and then a small amount of methylene chloride, and rac-dimethylmethylene (1-indenyl) (4,5-benzo-1-indenyl) zirconium dichloride in light blue was added. 76 g (yield 24
%)Obtained. By 1H-NMR spectrum measurement, 7.0
5 to 8.04 ppm (m, 10H, 7.17 ppm
, 7.17 ppm (d, H), 6.7
3. ppm (d, H), 6.25 ppm (d, H),
18 ppm (d, H), 2.41 ppm (m, 3H),
It has a peak at a position of 2.37 ppm (m, 3H).
The measurement was performed based on TMS using CDCl ₃ as a solvent.

Experimental Example 1 Synthesis of Copolymer P-1 Polymerization was carried out using an autoclave having a capacity of 10 L, a stirrer and a jacket for heating and cooling. Dehydrated toluene 4
000 ml and 800 ml of dehydrated styrene were charged and heated and stirred at an internal temperature of 50 ° C. 7. About 100 L of nitrogen was bubbled through to purge the system, and triisobutylaluminum was added.
4 mmol, methylalumoxane (manufactured by Tosoh Akzo Co., Ltd.
8.4 mmol based on Al was added. Immediately after ethylene was introduced and the pressure was stabilized at 10 kg / cm ² G, the catalyst rac @ Bind-C (Me) ₂ -Bind @ ZrC was removed from the catalyst tank installed on the autoclave.
The l ₂ was added 0.84Myumol, a toluene solution of about 50ml was dissolved triisobutylaluminum 0.84mmol the autoclave. The polymerization was carried out for 5 hours while maintaining the internal temperature at 50 ° C. and the ethylene pressure at 1 kg / cm ² G (2 atm of ethylene pressure). During the polymerization, the temperature of the reaction solution and the consumption rate of ethylene were monitored by a flow integrator, and the polymerization was carried out until the polymerization reaction was substantially completed. After the completion of the polymerization, the resulting polymerization solution was poured little by little into excessively vigorously stirred excess methanol to precipitate the produced polymer. After drying under reduced pressure at 60 ° C. until no change in weight was observed, the copolymer 46 having a styrene content of 11.5 mol% was obtained.
4 g were obtained.

Experimental Example 2 Synthesis of Copolymer P-2 The amount of the catalyst was changed to 2.1 μmol, and the methylalumoxane used was changed to MMAO-3A manufactured by Tosoh Akzo Co., Ltd. to 84 mmol based on Al, and the polymerization time was changed to 4 hours. Polymerization and post-treatment were carried out in the same manner as in Experimental Example 1 except for the change. As a result, 874 g of a copolymer having a styrene content of 15.5 mol% was obtained.

EXPERIMENTAL EXAMPLE 3 Synthesis of Copolymer P-3 The catalyst amount was changed to 8.4 μmol, the methylalumoxane used was changed to MMAO-3A, manufactured by Tosoh Akzo Co., Ltd. Polymerization and post-treatment were carried out in the same manner as in Experimental Example 1 except that the polymerization time was changed to 2400 ml and the polymerization time was changed to 1.5 hours. As a result, 1320 g of a copolymer having a styrene content of 37.1 mol% was obtained.
I got

Experimental Example 4 Synthesis of Copolymer P-4 The catalyst used was rac @ Ind-C (Me) ₂ -BIn
The amount of methylalumoxane used was changed to 8.4 μmol of d @ ZrCl _{2 and} MMAO-3A manufactured by Tosoh Akzo Co., Ltd.
1 mmol to 84 mmol, styrene to 2400 ml,
The polymerization and post-treatment were carried out in the same manner as in Experimental Example 1 except that the amount of toluene was changed to 2400 ml and the polymerization time was changed to 5 hours.
As a result, a copolymer 870 having a styrene content of 31.8 mol% was obtained.
g was obtained.

Table 1 shows one of the copolymers obtained in each experimental example.
Styrene content obtained from H-NMR measurement, molecular weight obtained from GPC measurement, molecular weight distribution, tacticity m value of styrene-ethylene alternating structure obtained from 13C-NMR measurement, λ value, θ value, obtained by DSC measurement. Melting point.

[0077]

[Table 1]

Example 1 Denkastyrol GP-1 (melt flow rate = 9.5 gr / 10 min, styrene resin, measurement conditions:
70 parts by weight of the styrene-ethylene random copolymer P-1 (11.5 mol% of styrene) obtained in Experimental Example 1 and 30 parts by weight of Percumyl D-40 using 30 parts by weight of 200 ° C., 5 kg).
(Nippon Yushi, 40% pure), 1 part by weight of divinylbenzene were charged into a 3 liter Banbury mixer.
The mixture was kneaded at 100 rpm under water cooling. After the internal temperature had risen to 185 ° C., kneading was continued for a further 3 minutes and stopped to produce a thermoplastic elastomer composition. Seating with a roll,
A press sheet was prepared and physical properties were measured. Table 2 shows the results
Shown in

Example 2 A thermoplastic elastomer composition was prepared in the same manner as in Example 1 except that P-2 (15.5 mol% of styrene) was used instead of the styrene-ethylene random copolymer P-1. An object was prepared and physical properties were measured. Table 2 shows the results.

Examples 3 and 4 In Example 1, P-3 and P-4 were used instead of the styrene-ethylene random copolymer P-1 (styrene 37.
A thermoplastic elastomer composition was prepared in the same manner as in Example 1 except that 1 mol% (31.8) was used, and physical properties were measured. Table 2 shows the results.

Example 5 The effect of process oil was observed by adding 50 PHR of process oil PW-380 manufactured by Idemitsu Kosan Co., Ltd. as a softening agent in the formulation of Example 3.

Example 6 In the recipe of Example 3, the ratio of the styrene resin to the styrene-ethylene random copolymer was 20:80.

Comparative Example 1 Nittopolypro K-7730 was used in place of the styrene resin in the formulation of Example 3, and EP-22 which is a normal EPDM was used instead of the styrene-ethylene random copolymer.
Using a Mooney value (100 ° C.) = 42, propylene content = 43%, manufactured by JSR Corporation, the same operation as in Example 1 was performed to prepare a normal olefin-based thermoplastic elastomer.

Comparative Example 2 The procedure of Example 6 was repeated except that styrene resin was replaced by nitrogen polypro K-7730 and styrene-ethylene random copolymer was replaced by ordinary EPDM EP-22.

[0085]

[Table 2]

<Method for Measuring Physical Properties> (1). Hardness: A hardness was measured according to JIS K-6301. (2). Tensile strength and elongation: Measured according to JIS K-6723. (3). Scratch resistance: A sample that was hardly scratched by rubbing the surface with a felt cloth was rated X, and one that was easily scratched was rated X.
(Visual judgment)

[0087]

As described above, the aromatic vinyl-olefin-based thermoplastic elastomer composition comprising the styrene resin of the present invention and an aromatic vinyl compound-olefin random copolymer and obtained by a dynamic vulcanization method. Is excellent in tensile properties and surface scratch resistance, and is useful in a wide range of fields such as automobile parts, industrial machine parts, and building materials.

Claims (8)

[Claims] 1. A styrene resin (A) in an amount of 10 to 85% by weight.
And (B) an aromatic vinyl compound-olefin thermoplastic copolymer composition comprising 15 to 90% by weight of an aromatic vinyl compound-olefin random copolymer and obtained by a dynamic vulcanization method. (B) The aromatic vinyl compound-olefin random copolymer has an aromatic vinyl compound content of 1 to less than 99.9 mol% and has a head-tail chain structure of two or more aromatic vinyl compound units. Aromatic vinyl compound-
It is an olefin random copolymer. 2. The aromatic vinyl compound / olefin-based heat according to claim 1, wherein the (B) aromatic vinyl compound / olefin random copolymer is an aromatic vinyl compound / ethylene random copolymer. Plastic elastomer composition. 3. A phenyl group having an alternating structure of an aromatic vinyl compound represented by the following general formula (1) and ethylene, wherein the aromatic vinyl compound-ethylene random copolymer (B) is contained in the copolymer structure. The isotactic dyad fraction m is greater than 0.75 in terms of stereoregularity, and the alternating structure index λ given by the following formula (i) is smaller than 70 and larger than 1. The aromatic vinyl compound / olefin-based thermoplastic elastomer composition according to the above. λ = A3 / A2 × 100 Formula (i) Here, A3 is three kinds of peaks derived from an aromatic vinyl compound-ethylene alternating structure represented by the following general formula (1 ′) and obtained by 13 C-NMR measurement. This is the sum of the areas a, b, and c. A2 is 1 based on TMS.
It is the total area of peaks derived from main chain methylene and main chain methine carbon observed in the range of 0 to 50 ppm by 3C-NMR. Embedded image (Wherein Ph represents an aromatic group, x represents the number of repeating units, and 2
Represents the above integer. ) (Wherein Ph represents an aromatic group, x represents the number of repeating units, and 2
Represents the above integer. ) 4. An aromatic vinyl compound-ethylene random copolymer (B) is a 13C-NMR based on TMS.
40-41 ppm and / or 42-44 depending on the measurement
The aromatic vinyl compound / olefin thermoplastic elastomer composition according to claim 2, which has a chain structure of an aromatic vinyl compound unit assigned by a peak appearing in ppm. 5. The aromatic vinyl compound-ethylene random copolymer (B) has an aromatic vinyl compound content of 1% or more and less than 20% by mole fraction and a polystyrene equivalent weight average molecular weight of 60,000 or more. The aromatic vinyl compound / olefin thermoplastic elastomer composition according to claim 2, characterized in that: 6. The aromatic vinyl compound content of the aromatic vinyl compound-ethylene random copolymer (B) is at least 20% and less than 99.9% by mole fraction, and the weight average molecular weight in terms of polystyrene is at least 30,000. The aromatic vinyl compound / olefin-based thermoplastic elastomer composition according to claim 2, wherein 7. The aromatic vinyl compound according to claim 2, wherein the stereoregularity of the chain structure of the aromatic vinyl compound unit of the aromatic vinyl compound-ethylene random copolymer (B) is isotactic. Compound / olefin-based thermoplastic elastomer composition. 8. A copolymer prepared by using (B) an aromatic vinyl compound-olefin random copolymer with a catalyst comprising a transition metal compound for polymerization represented by the following general formula (2) and a co-catalyst: The aromatic vinyl compound / olefin-based thermoplastic elastomer composition according to claim 1, which is a united product. Embedded image In the formula, A is an unsubstituted or substituted indenyl group or an unsubstituted or substituted benzoindenyl group. B is an unsubstituted or substituted cyclopentadienyl group, an unsubstituted or substituted indenyl group, an unsubstituted or substituted benzoindenyl group, or an unsubstituted or substituted fluorenyl group. A, B
When both are unsubstituted or substituted indenyl groups or unsubstituted or substituted benzoindenyl groups, they may be the same or different. Y is a methylene group or a silylene group having a bond to A and B and having hydrogen or a hydrocarbon group having 1 to 15 carbon atoms as a substituent. These substituents may be different or the same. Y may have a cyclic structure. X is hydrogen, halogen, an alkyl group, an aryl group, a silyl group, an alkoxy group or a dialkylamide group. M is a Group IV metal.