JPH111508A - Catalytic component for alpha-olefin polymerization, catalyst and production of alpha-olefin polymer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject catalyst component useful for solution polymerization method, high pressure polymerization method, slurry polymerization method and vapor phase polymerization method by combining a metallocene- based transition metal compound crosslinked at a specific position with an ion-exchangeable layered silicate. SOLUTION: This catalytic component for α-olefin polymerization is obtained by combining (A) a transition metal compound represented by formula I or formula II [M is titanium, zirconium or hafnium; R is a halogen, a silicon- containing group, a 1-20C hydrocarbon, etc.; (a) is 0-3; (b) is 0-7; Q is a 1-30C bifunctional hydrocarbon, etc.; X and Y are each a halogen atom, H, 1-20C hydrocarbon, etc.] with (B) an ion-exchangeable layered silicate [e. g. smectites such as montmorillonite or sauconite, vermiculite or mica] and (C) an organoaluminum compound represented by the formula R<1> c AlX<1> 3-c [R<1> is a 1-20C hydrocarbon; X<1> is a halogen atom, H, an alkoxy or an amide; c is 0<(c)<=3].

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a catalyst component for olefin polymerization, a catalyst, and a method for obtaining an olefin polymer in a high yield by using the catalyst. In particular, the present invention can be applied to solution polymerization, high pressure polymerization, slurry polymerization and gas phase polymerization, and particularly to slurry polymerization and high molecular weight olefin polymer when applied to gas phase polymerization. The present invention relates to an olefin polymerization catalyst that can be produced and a method for obtaining an olefin polymer in a high yield by using the catalyst.

[0002]

2. Description of the Related Art In producing an olefin polymer by polymerizing an olefin, a method using a catalyst comprising (1) a metallocene compound and (2) an aluminoxane has been proposed (Japanese Patent Application Laid-Open No. 58-119309, JP-A-2-167307). A polymerization method using these catalysts is based on a conventional Ziegler-based compound comprising a titanium compound or a vanadium compound and an organoaluminum compound.
Compared with the method using a Natta catalyst, a polymer having a very high polymerization activity per transition metal and a sharp molecular weight distribution and a sharp composition distribution can be obtained.

However, in order to industrially obtain sufficient polymerization activity using these catalysts, a large amount of aluminoxane is required, so that the polymerization activity per aluminum is low, which is not only uneconomical, but also produces It was necessary to remove catalyst residues from the polymer. On the other hand, there has been proposed a method of polymerizing an olefin using a catalyst in which one or both of the above metallocene complex and aluminoxane are supported on an inorganic oxide such as silica or alumina (Japanese Patent Application Laid-Open No. 61-1986).
Nos. 108610, 60-135408, 61-296008, JP-A-3-74412, and 3-74415. Further, a method of polymerizing an olefin with a catalyst in which one or both of a metallocene compound and an organic aluminum compound are supported on an inorganic oxide or an organic substance such as silica or alumina has been proposed (JP-A-1-101303, JP-A-1-101303). 1-207
No. 303, No. 3-234709, Tokuhei Hei 3-
No. 501869). Furthermore, a method of prepolymerizing these supported catalysts has also been proposed (Japanese Patent Laid-Open No. 3-2347).
No. 10 publication).

[0004] However, even in these proposed methods, the polymerization activity per aluminum was still not sufficient, and the amount of catalyst residue in the product was not negligible. As a solution to these problems,
A catalyst comprising an ion-exchangeable layered compound or an inorganic silicate, an organoaluminum and a metallocene compound, and a catalyst obtained by prepolymerizing the same have been proposed (Japanese Patent Laid-Open Publication No. Hei 5 (1994)).
-29522).

Although these catalysts have sufficient polymerization activity per transition metal or aluminum, it has been found that hydrogen is generated during polymerization and the generated hydrogen reduces the molecular weight of the polymer. In order to obtain, it is necessary to control a very small amount of hydrogen or to take special measures such as removing generated hydrogen.

On the other hand, in a catalyst comprising a metallocene compound and an aluminoxane, when at least one of the ligands of the metallocene compound is a cyclopentadienyl ligand having two different substituents, the molecular weight is increased. A method for obtaining an olefin polymer having a narrow molecular weight distribution has been proposed (JP-A-5-148317). However, even when this catalyst was used, the molecular weight of the polymer obtained was not always sufficient.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an α-olefin polymerization which has a high polymerization activity per transition metal compound as a catalyst component and can obtain a polymer having a large molecular weight and a narrow molecular weight distribution by the main polymerization. Catalyst components and catalysts,
And a method for polymerizing an α-olefin using the catalyst.

[0008]

Means for Solving the Problems The present inventors have conducted studies to solve the above problems, and as a result, have found that a metallocene-based transition metal compound crosslinked at a specific position is supported on an ion-exchangeable layered silicate. By doing so, the present inventors have found the present catalyst system capable of producing a polymer having a sufficiently high polymerization activity per transition metal and aluminum and a high molecular weight, and have reached the present invention. That is, the present invention provides an α-olefin polymerization catalyst component obtained by combining the following components [A] and [B]. [A] A single or mixture of a transition metal compound represented by the following formula [1a] or [1b].

[0009]

Embedded image

(In the formulas [1a] and [1b], M is titanium, zirconium, or hafnium, and R is each independently a halogen, a silicon-containing group, a C1 to C2
0 hydrocarbon group or halogen-containing hydrocarbon group, alkoxy group, aryloxy group, amino group (provided that
When a plurality of Rs are present on the same indenyl or hydroindenyl group, they may be mutually bonded at the ω-terminal to form a ring together with a part of the indenyl or hydroindenyl group. , A is an integer of 0 or more and 3 or less, b is an integer of 0 or more and 7 or less, and Q has 1 to 3 carbon atoms.
0, a divalent hydrocarbon group or a hydrocarbon group containing silicon or germanium, X and Y each independently represent a halogen atom, a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms, an alkoxy group , An aryloxy group, an amide group, and a trifluoromethanesulfonic acid group. )

[B] Ion-exchangeable layered silicate. The present invention also provides an α-olefin polymerization catalyst obtained by combining the above-mentioned catalyst component with the following component (C), and a method for producing an α-olefin polymer using the polymerization catalyst. is there. [C] An organoaluminum compound represented by the following formula [2].

[0012]

Embedded image R ¹ _c AlX ¹³ _3-c [2]

(In the formula (2), R ¹ has 1 to 2 carbon atoms.
A hydrocarbon group of 0, X ¹ represents a halogen atom, a hydrogen atom, an alkoxy group, or an amide group, and c is a number satisfying 0 <c ≦ 3).

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The metallocene transition metal compound [A] used in the catalyst of the present invention is an organometallic compound comprising a substituted cyclopentadienyl ligand bridged at a specific position and titanium, zirconium or hafnium. It is. Preferred as such a metallocene transition metal compound is a compound represented by the following general formula [1a] or [1b].

[0015]

Embedded image

(In the formula [1a] or [1b], M
Is titanium, zirconium, hafnium, and R is each independently a halogen, a silicon-containing group, a hydrocarbon group having 1 to 20 carbon atoms or a halogen-containing hydrocarbon group,
An alkoxy group, an aryloxy group, or an amino group (provided that, when a plurality of R's are present on the same indenyl or hydroindenyl group, they are bonded to each other at their ω-terminal to form the indenyl or hydroindenyl group; A may be an integer of 0 or more and 3 or less, b is an integer of 0 or more and 7 or less, and Q is a divalent divalent group having 1 to 3 carbon atoms. , A hydrocarbon group or a hydrocarbon group containing silicon or germanium, wherein X and Y each independently represent a halogen atom, a hydrogen atom,
20 hydrocarbon groups, alkoxy groups, aryloxy groups,
Indicates an amide group. )

In the above general formula [1a] or [1b], R
Are each independently a halogen, a silicon-containing group, a carbon atom of 1
To 20 hydrocarbon groups or halogen-containing hydrocarbon groups, alkoxy groups, aryloxy groups, and amino groups (provided that when R is present on a plurality of the same indenyl or hydroindenyl group, they may have their ω May form a ring together with a part of the indenyl or hydroindenyl group by bonding to each other at the ends), specifically, halogen such as fluorine, chlorine, bromine, iodine, etc., trimethylsilyl group, triethylsilyl group A silicon-containing group such as a triphenylsilyl group, a methyl group, an ethyl group, an n-propyl group,
i-propyl group, n-butyl group, i-butyl group, t-butyl group, n-pentyl group, n-hexyl group, cyclohexyl group, n-heptyl group, n-nonyl group, n-decyl group, phenyl group , A 4-methylphenyl group or the like having 1 to 1 carbon atoms
20 hydrocarbon groups, or a monofluoromethyl group, a difluoromethyl group, a trifluoromethyl group, 1,1,1-
Trifluoroethyl group, pentafluorophenyl group, 4
1 carbon atom such as -fluorophenyl group, 2-fluorophenyl group, monochloromethyl group, monobromomethyl group, etc.
To 20 halogen-containing hydrocarbon groups, methoxy group, ethoxy group, propoxy group, alkoxy group such as butoxy group, phenoxy group, 4-methylphenoxy group, aryloxy group such as pentamethylphenoxy group, dimethylamino group,
Diethylamino group, diisopropylamino group, diphenylamino group, dicyclohexylamino group, pyridyl group,
And amino groups such as indolyl groups.

Of these, particularly preferred are a methyl group,
It is a phenyl group. X and Y represent a hydrogen atom, halogen such as chlorine or bromine, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group,
1-carbon group such as -butyl group, n-pentyl group, n-hexyl group, cyclohexyl group, n-heptyl group, n-nonyl group, n-decyl group, phenyl group and 4-methylphenyl group
To 20 hydrocarbon groups, methoxy group, ethoxy group, propoxy group, alkoxy group such as butoxy group, phenoxy group,
4-methylphenoxy group, aryloxy group such as pentamethylphenoxy group, dimethylamide group, diethylamide group, diisopropylamide group, diphenylamide group,
An amide group such as a dicyclohexylamide group, and trifluoromethanesulfonic acid are shown.

Among them, chlorine, hydrogen atom, methyl group, dimethylamide group, diethylamide group and trifluoromethanesulfonic acid group are preferred. Q is a divalent group bridging two indenyl or hydroindenyl derivatives with a 6-membered ring portion, and is a divalent hydrocarbon group having 1 to 30, preferably 1 to 6 carbon atoms, silicon or It is a hydrocarbon group containing germanium, specifically,
Divalent hydrocarbon groups such as methylene group, ethylene group, isopropylidene group, diphenylmethylene group, tetramethylethylene group, methylphenylmethylene group, 1,4-diphenylene group, 1,4-cyclohexylene group, and dimethylsilylene group , A silicon-containing group such as a methylphenylsilylene group and a diphenylsilylene group, and a germanium-containing group such as a dimethylgermylene group. In these crosslinking groups, the distance between the two divalent bonds is preferably 4 atoms or less regardless of the total number of atoms. Such preferred crosslinking groups include a methylene group, an ethylene group, a dimethylsilylene group and the like.

The metallocene transition metal compound represented by the above formula [1a] or [1b] is specifically exemplified in Tables 1 and 2 when M is zirconium.
When an asymmetric carbon occurs in these transition metal compounds, one or a mixture of stereoisomers is indicated unless otherwise specified. When two indene or hydroindene derivative ligands each having a substituent R have a relative position via a bridging group Q, unless otherwise specified, a plane containing M, X, and Y One of symmetric and asymmetric stereoisomers,
Or a mixture thereof.

As the metallocene-based transition metal compound which is the component [A] of the present catalyst, the case where M of [1a] or [1b] is titanium or hafnium is specifically described as the above zirconium compound. Titanium,
Hafnium bodies can be mentioned. The transition metal compound represented by the formula [1a] or [1b] may be either a single compound or a mixture of both.

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

[Table 3]

[0025]

[Table 4]

[0026]

[Table 5]

[0027]

[Table 6]

[0028]

[Table 7]

[0029]

[Table 8]

[0030]

[Table 9]

[0031]

[Table 10]

[0032]

[Table 11]

[0033]

[Table 12]

[0034]

[Table 13]

[0035]

[Table 14]

As the component [B] of the present catalyst, an ion-exchange layered silicate is used. An ion-exchangeable phyllosilicate is a silicate compound having a crystal structure in which a plate-like structure formed by covalent bonds or the like is stacked in parallel with weak ionic bonding force or the like, and the ions contained therein are exchangeable. . Ion-exchanged layered silicates are naturally produced mainly as a main component of clay minerals, but these ion-exchanged layered silicates are not particularly limited to natural ones and may be artificially synthesized. .

Specific examples of the ion-exchangeable layered silicate include kaolins such as dickite, nacrite, kaolinite, anoxite, metahaloysite, halloysite, serpentine groups such as chrysotile, risaldite, antigolite, montmorillonite, Zaukonite, Hydelight, Nontronite, Saponite, Bentonite,
Smectites such as hectorite and stevensite,
Vermiculite, vermiculite, illite,
Examples include mica tribes such as sericite and chlorite, attapulgite, sepiolite, palygorskite, pyrophyllite, talc, chlorite, allophane, and imogolite. These may form a mixed layer.

Among these, montmorillonite, zaukonite, beidellite, nontronite, saponite, hectorite, stevensite, bentonite,
Smectites such as teniolite and mica, vermiculites and mica are preferred. These may be used as they are without any particular treatment, or may be used in contact with a ball mill, sieving, an inorganic acid such as hydrochloric acid, sulfuric acid, phosphoric acid, or an organic acid such as formic acid, acetic acid or benzoic acid, or the like. It may be used after performing the processing of. Further, they may be used alone or as a mixture of two or more.

The above-mentioned ion-exchangeable layered silicate can replace or exchange cations between layers or the like with other cations by utilizing its ion-exchange properties. Specifically, an alkali metal such as Na ⁺ and Li ⁺ existing between the layers is exchanged with a salt having another cation, an acid, an alkali, an organic compound, or the like. The ion exchange method is not particularly limited, and a general method can be employed. One example is salts,
This is carried out by adding and dispersing the ion-exchange layered silicate to an aqueous solution of an acid, an alkali or an organic compound and stirring for a desired time. At this time, the ion exchange amount can be controlled to a desired value by appropriately selecting the concentration, temperature, and the like of salts, acids, alkalis, or organic compounds. As such salts, acids, alkalis or organic compounds, specifically, inorganic acids such as hydrochloric acid, sulfuric acid, and nitric acid;
Acetic acid, organic acids such as oxalic acid, polyacids represented by heteropolyacids, and the like.In these cases,
H ⁺ is exchanged between the layers. Also, ammonium chloride,
After ion exchange with ammonium ions such as ammonium sulfate, H ⁺ can be introduced between layers by heat treatment or the like. In addition, salts composed of a cation containing at least one kind of atom selected from the group consisting of Group 2 to 14 atoms and at least one kind of anion can be used. Examples of such salts include magnesium and aluminum. Chloride, bromide, iodide, lead sulfate, nitrate, chlorate and perchlorate of titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, zirconium, tin and the like. In this case, a cation containing at least one atom selected from the group consisting of Group 2 to 14 atoms is introduced between the layers. Examples of the ion-exchangeable organic compound include monobutylammonium ion, dibutylammonium ion, tributylammonium ion, tetrabutylammonium ion, anilinium ion, dimethylanilinium ion, tetraphenylphosphonium ion, and tetrabutylphosphonium ion. An organic compound having an ammonium ion, a phosphonium ion, or the like having one hydrocarbon group can be given. Further, organometallic compounds such as porphyrin and crown ether complex salts can be introduced. Further, by appropriately selecting the salt treatment conditions, the atoms in the layer structure can be exchanged.

These ion-exchange layered silicates can be subjected to an acid treatment. In this acid treatment, in addition to replacing ions existing between layers with protons, the chemical composition can be changed by elution of cations from the layer structure. In such an acid treatment, a desired acid-treated ion-exchange layered silicate can be obtained by appropriately selecting treatment conditions (acid concentration, temperature) and the kind of acid. The acid used for such acid treatment is not particularly limited, but is preferably hydrochloric acid, sulfuric acid, nitric acid, acetic acid or oxalic acid. These acids may be used alone or in combination of two or more, and may be used in combination with the salt treatment.

When these ion-exchangeable layered silicates are used in the present catalyst, they may be used in any shape in accordance with the polymerization apparatus to be used, but are applicable to a gas phase polymerization method, a slurry polymerization method and the like. In this case, the average particle size is from 5 μm to 1
The use of granulated particles having a particle size of 00 μm is advantageous in terms of process operation since the bulk density of the catalyst and the obtained polymer can be increased.

Further, these ion-exchange layered silicates are
It is preferable to dry before reacting with the metallocene complex. In the present invention, a catalyst can be obtained by combining, for example, a component [C] represented by the following formula [2] with a catalyst component obtained by combining the components [A] and [B].

[0043]

Embedded image R ¹ _c AlX ¹³ _3-c [2]

(In the formula (2), R ¹ has 1 to 2 carbon atoms.
A hydrocarbon group of 0, X ¹ represents a halogen atom, a hydrogen atom, an alkoxy group, or an amide group, and c is a number satisfying 0 <c ≦ 3). Specific examples of the component [C] include trimethylaluminum, triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, and tri-n-aluminum.
Trialkyl aluminum such as hexyl aluminum,
Alkylaluminum hydrides such as diethylaluminum hydride and diisobutylaluminum hydride; halogen-containing alkylaluminums such as diethylaluminum chloride and diisobutylaluminum chloride; alkylaluminum alkoxides such as diethylaluminum methoxide and diisobutylaluminum methoxide; diethylaluminum (diethylamide); diisobutylaluminum And alkylaluminum amides such as (diethylamide). These aluminum compounds may be used alone or in combination of two or more such as, for example, a mixture of triethylaluminum and triisobutylaluminum, or a mixture of trialkylaluminum and halogen-containing alkylaluminum. You may.

The method for producing the catalyst is not particularly limited. For example, the catalyst can be produced by the following method. In an inert gas, a previously dried salt- or acid-treated ion-exchanged layered silicate is suspended in a hydrocarbon solvent, and a metallocene complex-dissolved hydrocarbon solution and, if necessary, an organoaluminum compound are added thereto. In addition, it is obtained by processing for a predetermined time.

In the present invention, the components [A] to [C] may be preliminarily polymerized by contacting them with an α-olefin or an aromatic vinyl monomer, that is, the prepolymerized one may be used as a catalyst. The prepolymerization is usually carried out with ethylene, but if necessary, other olefins such as propylene, 1-butene, 4-methyl-1-
Α-olefins such as pentene and 3-methyl-1-pentene; aromatic vinyl monomers such as styrene and α-methylstyrene; and mixtures thereof can be used.

When the catalyst of the present invention is used as a prepolymerized catalyst, a prepolymerized polymer is present in the catalyst. The amount of the prepolymerized polymer present in the catalyst is 0.01 to 1000 g, preferably 0.1 g, per 1 g of the component [B] used, that is, 1 g of the ion-exchange layered silicate.
It is 1 g to 100 g, more preferably 1 g to 50 g.

Examples of the solvent used for contacting the ion-exchange layered silicate with the metallocene transition metal compound include inert hydrocarbons, specifically, chain hydrocarbons such as pentane, hexane and heptane, benzene, toluene, xylene and the like. Is preferred. The contact temperature is not particularly limited, but may be from -20 ° C to 15 ° C.
It is preferably carried out between 0 ° C. The amount of the metallocene-based transition metal compound used for the component [B], which is an ion-exchange layered silicate, and the amount of the component [A] are appropriately selected, but are preferably from 1 μmol to 1 g of the component [B]. 1000
Used in μmol amounts.

The method of the prepolymerization is not particularly limited, but is usually carried out by slurry polymerization in a hydrocarbon solvent. The hydrocarbon solvent used at this time is appropriately selected. For example, the hydrocarbon solvent used at the time of the above-mentioned contact is suitably used. The pre-polymerization catalyst may be used as a slurry after the completion of the pre-polymerization, or may be used, if necessary, after washing and drying to obtain a powder. At this time, the drying conditions are not particularly limited, but preferably the drying is performed at 0 ° C. to 100 ° C. under reduced pressure or under a flow of a dry inert gas.

The catalyst of the present invention is used for the polymerization of α-olefins. Examples of the α-olefin include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-pentene, and 4-methyl-olefin. Examples thereof include vinylcycloalkanes such as 1-pentene and vinylcyclohexane, ethylidene norbornene derivatives, styrene and styrene derivatives, and include homopolymerization and copolymerization with these monomers. The polymerization process is not particularly limited, for example, it can be used in a gas phase polymerization method, a slurry polymerization method, a solution polymerization method, or a high-pressure polymerization method, but when the present catalyst is used, the bulk density is high, Since a polymer having a good particle shape can be obtained, it is suitably used for a gas phase polymerization method and a slurry polymerization method.

[0051]

According to the present invention, an olefin can be polymerized with high polymerization activity, and an olefin polymer having a high molecular weight and a narrow molecular weight distribution can be produced.

[0052]

【Example】

Example 1 [Preparation of catalyst] After a 200 mL flask equipped with a stirrer was purged with nitrogen, 2.0 g of a granulated zinc ion exchange type synthetic mica (average particle size of 5) was dried at 200 ° C for 2 hours under reduced pressure in advance.
9 micron) and then 50.0 mL of toluene. The slurry contains a metallocene complex, ethylene-
20.0 mL of a complex solution in which 75.9 mg of 1,2-bis {4- (2,7-dimethyl-indenyl)} zirconium dichloride was dissolved in toluene was added at room temperature with stirring. After stirring for 10 minutes, heptane was added to adjust the total amount of the solvent to 200 mL to prepare a slurry catalyst.

[Polymerization] 3 minutes at 100 ° C. in advance of nitrogen flow.
Heptane 500 mL, 1-hexene 30 m at room temperature in a stainless steel, 1.0 L autoclave dried for 0 min
L, and 8.0 m of the slurry catalyst prepared in (1) above.
After adding L (equivalent to 80 mg as synthetic mica), the temperature and the pressure of ethylene were increased to 65 ° C. and 7.0 kgf /
cm ² -G, the temperature and pressure in the polymerization tank were stabilized, and a heptane solution of triethylaluminum (equivalent to 285 mg of triethylaluminum) was further added. The polymerization was carried out for 1.5 while maintaining the total pressure at 7.0 kgf / cm ² -G.
Time went. After the completion of the polymerization, the reaction system was cooled, and after purging ethylene, a polyethylene slurry was extracted and filtered. The obtained polymer was dried at 100 ° C. for 12 hours to obtain 17.8 g of an ethylene / 1-hexene copolymer. The results are shown in Table-3.

Example 2 A catalyst was prepared, polymerized and post-treated in the same manner as in Example 1 except that 285 mg of triethylaluminum added during polymerization was changed to 57 mg to obtain 15.9 g of a polymer. The results are shown in Table-3. Example 3 In Example 1, ethylene-1,2-bis {4-
Instead of (2,7-dimethyl-indenyl) {zirconium dichloride, ethylene-1,2-bis} 4- (7-
Methyl-indenyl) @zirconium dichloride
Catalyst preparation, polymerization and post-treatment were carried out in the same manner except that 4 mg was used to obtain 11.5 g of a polymer. The results are shown in Table-3.

Example 4 A catalyst was prepared, polymerized and post-treated in the same manner as in Example 3, except that 285 mg of triethylaluminum added during the polymerization was changed to 57 mg to obtain 10.2 g of a polymer. The results are shown in Table-3. Comparative Example 1 In Example 1, ethylene-1,2-bis {4-
(2,7-dimethyl-indenyl)} Catalyst preparation, polymerization and post-treatment were carried out in the same manner except that 64.7 mg of bis (n-butylcyclopentadienyl) zirconium dichloride was used in place of zirconium dichloride. 7 g were obtained. The results are shown in Table-3.

[0056]

[Table 15]

[Brief description of the drawings]

FIG. 1 is a flowchart for helping the understanding of the present invention.

Claims (4)

[Claims] 1. An α-olefin polymerization catalyst component obtained by combining the following components [A] and [B]. [A] A single or mixture of a transition metal compound represented by the following formula [1a] or [1b]. Embedded image (In the formulas [1a] and [1b], M is titanium, zirconium, hafnium, and R is each independently
Halogen, a silicon-containing group, a hydrocarbon group having 1 to 20 carbon atoms or a halogen-containing hydrocarbon group, an alkoxy group, an aryloxy group, or an amino group (provided that R is present on the same indenyl or hydroindenyl group in plural numbers) In these cases, they may be mutually bonded at the ω-terminal to form a ring together with a part of the indenyl or hydroindenyl group), a is an integer of 0 or more and 3 or less, and b is X is an integer of 0 to 7, Q is a divalent hydrocarbon group having 1 to 30 carbon atoms or a hydrocarbon group containing silicon or germanium, and X and Y are each independently
It represents a halogen atom, a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms, an alkoxy group, an aryloxy group, an amide group, or a trifluoromethanesulfonic acid group. [B] Ion-exchangeable layered silicate. 2. In the presence of an α-olefin polymerization catalyst component according to claim 1 and an organoaluminum compound,
[B] An α-olefin polymerization catalyst component obtained by prepolymerizing 0.01 to 1000 g of olefin per 1 g of component. 3. An α-olefin polymerization catalyst comprising a combination of the α-olefin polymerization catalyst component according to claim 1 or 2 and the following component [C]. [C] An organoaluminum compound represented by the following formula [2]. Embedded image R ¹ _c AlX ¹³ _-c [2] (In the formula [2], R ¹ is a hydrocarbon group having 1 to 20 carbon atoms, and X ¹ is a halogen atom, a hydrogen atom, an alkoxy group, or an amide group. And c is a number satisfying 0 <c ≦ 3). 4. A method for producing an α-olefin polymer, comprising polymerizing an α-olefin in the presence of the catalyst according to claim 3.