JP2000178281A - Production of ionic compound, olefin polymerization catalyst and olefin-based polymer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new ionic compound useful as a catalytic component for olefin polymerization. SOLUTION: This new ionic compound is a compound of the formula (R1 to R3 are each H, a 1-20C hydrocarbon, 1-20C halohydrocarbon or silicon-contg. group; R4 to R12 are each H, a halogen, 1-20C hydrocarbon or 1-20C halohydrocarbon; X and Y are each a 1-20C alkylene, 6-20C arylene or the like; Z is an onium compound; k and l are each 1 or 0; k+l>=1), e.g. N,N- dimethylaniliniumtriphenyl-4-(4-vinylbenzyl)phenylborate. The compound of the formula is obtained, for example, by treating a halovinyl compound (e.g. chloromethylstyrene) and a phenylborane lithium compound [e.g. lithium 2,3,5,6- tetrafluorophenyltris(pentafluorophenyl)borate] with n-butyllithium followed by reaction of an onium halide compound (e.g. diethylanilinium chloride).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ionic compound used as a catalyst component for olefin polymerization, a catalyst for olefin polymerization and a process for producing an olefin polymer, and more particularly to a novel ionic compound as a co-catalyst for olefin polymerization. The present invention also relates to a transition metal compound belonging to Groups 8 to 10 of the periodic table, a catalyst for olefin polymerization comprising the ionic compound and an organoaluminum compound, and a method for producing an olefin polymer. The olefin polymerization catalyst of the present invention has high activity without adhering to the reactor wall, and an olefin polymer can be obtained industrially advantageously.

[0002]

2. Description of the Related Art In producing an olefin polymer by polymerizing olefins in the presence of a catalyst, a method has been proposed in which (1) a metallocene compound is used as a main catalyst component and (2) aluminoxane is used as a promoter component. (JP-A-58-19309, JP-A-2-1673)
No. 07 publication). Further, a method using a borate compound as a substitute for the aluminoxane of (2) has been proposed (Japanese Patent Application Laid-Open No. 1-502036). The production method of an olefin polymer using these catalyst systems has a very high polymerization activity per transition metal as compared with a conventional production method using a Ziegler-Natta catalyst comprising a titanium compound, a zirconium compound or a hafnium compound and an organoaluminum compound. And a polymer having a high molecular weight distribution and a narrow molecular weight distribution can be obtained.

[0003] On the other hand, recently, as a new system different from these, nickel and palladium, etc.
Systems using complexes of metals belonging to groups 10 to 10 have been developed. (JP-A-4-227608, JP-B-5-17)
No. 96, JP-A-61-203106, JP-A-3-115311 and the like. However, in order to obtain a sufficient activity using these catalyst systems, a large amount of aluminoxane is required, so that there is a drawback that the activity per aluminum is low and uneconomical. Further, when the aluminoxane is replaced with a borate compound as the co-catalyst component, although the amount used is small, there is a problem that the produced polymer tends to adhere to the reactor wall, which may hinder stable operation of the apparatus. For this reason, examples using a boron compound (JP-A-8-143617, JP-A-8-1276)
No. 11) has been proposed, but has the disadvantage of low activity.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to an ionic compound useful as a catalyst component for olefin polymerization, and an olefin which is highly active without adhering to the reactor wall and gives an olefin polymer industrially advantageously. It is an object of the present invention to provide a polymerization catalyst and a method for producing an olefin polymer.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that an olefin comprising a ionic compound having a specific structure, a transition metal compound belonging to Groups 8 to 10 of the periodic table, and an organoaluminum compound. The present inventors have found that a similar polymerization catalyst can achieve the object, and have completed the present invention based on such findings.

That is, the present invention provides the following ionic compounds, catalysts for olefin polymerization, and methods for producing olefin polymers. 1. An ionic compound represented by the following general formula (I).

[0007]

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[0008] [wherein, R ¹ to R ³ each independently represent a hydrogen atom, a hydrocarbon group, halogenated hydrocarbon group or a silicon-containing group having 1 to 20 carbon atoms having 1 to 20 carbon atoms, R ⁴ ~ R
¹² each independently represent a hydrogen atom, a halogen atom, a carbon number of 1 to 2
0 represents a hydrocarbon group or a halogenated hydrocarbon group having 1 to 20 carbon atoms, and X and Y each independently represent an alkylene group having 1 to 20 carbon atoms, an arylene group having 6 to 20 carbon atoms, a silylene group, or a germylene group. , -O-, -CO-, -S-, -S
O ₂ — or —NR ¹³ — (where R ¹³ represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or an aryl group having 6 to 12 carbon atoms). Z represents an onium compound. k, l
Represents 1 or 0, and k + 1 ≧ 1. ] 2. (A) a transition metal compound belonging to Groups 8 to 10 of the periodic table,
(B) An olefin polymerization catalyst comprising the ionic compound described in 1 above and (C) an organoaluminum compound. 3. (A) a transition metal compound belonging to Groups 8 to 10 of the periodic table,
An olefin polymerization catalyst comprising (B) a polymer of the ionic compound according to (1) or a copolymer of the ionic compound according to (1) and a compound having a double bond, and (C) an organoaluminum compound. 4. 4. The olefin polymerization catalyst according to the above 2 or 3, wherein the component (A) is a nickel or palladium complex having a diimine compound as a ligand. 5. 4. The olefin polymerization catalyst according to the above 2 or 3, wherein one of X and Y in the general formula (I) is an arylene group having 6 to 20 carbon atoms. 6. 4. The olefin polymerization catalyst according to the above item 2 or 3, wherein R ^{4 to} R ⁷ in the general formula (I) are halogen atoms. 7. 7. A method for producing an olefin polymer, comprising polymerizing an olefin in the presence of the catalyst for olefin polymerization according to any one of the above 2 to 6. 8. 6 or 7 above, wherein the olefin is propylene.
The method for producing the olefin polymer according to the above.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is a method for producing an ionic compound, an olefin polymerization catalyst and an olefin polymer as described above. Hereinafter, the ionic compound [I], the olefin polymerization catalyst [II], and the olefin polymer production method [III] of the present invention will be described in detail. [I] Ionic compound The ionic compound of the present invention is represented by the following general formula (I).

[0010]

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[0011] [wherein, R ¹ to R ³ each independently represent a hydrogen atom, a hydrocarbon group, halogenated hydrocarbon group or a silicon-containing group having 1 to 20 carbon atoms having 1 to 20 carbon atoms, R ⁴ ~ R
¹² each independently represent a hydrogen atom, a halogen atom, a carbon number of 1 to 2
0 represents a hydrocarbon group or a halogenated hydrocarbon group having 1 to 20 carbon atoms, and X and Y each independently represent an alkylene group having 1 to 20 carbon atoms, an arylene group having 6 to 20 carbon atoms, a silylene group, or a germylene group. , -O-, -CO-, -S-, -S
O ₂ — or —NR ¹³ — (where R ¹³ represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or an aryl group having 6 to 12 carbon atoms). Z represents an onium compound. k, l
Represents 1 or 0, and k + 1 ≧ 1. R ^{1 to} R ³ in the general formula (I) each independently represent a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms, a halogenated hydrocarbon group having 1 to 20 carbon atoms, or a silicon-containing group. A hydrogen atom and a hydrocarbon group having 1 to 20 carbon atoms are preferred. Carbon number 1
Specific examples of the hydrocarbon group of to 20 include a methyl group,
Ethyl group, propyl group, butyl group, hexyl, cyclohexyl group, alkyl group such as octyl group, vinyl group,
Alkenyl groups such as propenyl group and cyclohexenyl group; arylalkyl groups such as benzyl, phenylethyl group and phenylpropyl group; phenyl group, tolyl group, dimethylphenyl group, trimethylphenyl group, ethylphenyl group, propylphenyl group and biphenyl group And aryl groups such as naphthyl group, methylnaphthyl group, anthracenyl group and phenanthonyl group. Among them, an alkyl group such as a methyl group, an ethyl group and a propyl group and an aryl group such as a phenyl group are preferable. Examples of the halogenated hydrocarbon group having 1 to 20 carbon atoms include a halogenated hydrocarbon group in which a halogen atom is substituted for the hydrocarbon group. Examples of the halogen atom include a chlorine atom, a fluorine atom, a bromine atom and an iodine atom. Of these, halogenated alkyl groups such as a trifluoromethyl group and a trichloromethyl group are preferable. Examples of the silicon-containing group include monohydrocarbon-substituted silyl groups such as methylsilyl group and phenylsilyl group; dihydrocarbon-substituted silyl groups such as dimethylsilyl group and diphenylsilyl group; trimethylsilyl group, triethylsilyl group, tripropylsilyl group and tripropylsilyl group. Cyclohexylsilyl group, triphenylsilyl group, dimethylphenylsilyl group, methylphenyldisilyl group, tolylsilyl group,
A trihydrocarbylsilyl group such as a trinaphthylsilyl group; a silyl ether group of a trihydrocarbon substituted silyl group such as a trimethylsilyl ether group; and a silicon-substituted aryl group such as a trimethylsilylphenyl group.
Among them, a trimethylsilyl group, a phenethyldimethylsilyl group and the like are preferable.

R ^{4 to} R ¹² each independently represent a hydrogen atom,
It represents a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, and among them, a halogen atom and a hydrocarbon group having 1 to 20 carbon atoms are preferable.
Examples of the halogen atom include a chlorine atom, a fluorine atom, a bromine atom and an iodine atom. The hydrocarbon group having 1 to 20 carbon atoms or the halogenated hydrocarbon group having 1 to 20 carbon atoms is the same as in the case of R ^{1 to} R ³ . In the general formula (I), R ^{4 to} R ⁷ are more preferably a halogen atom, and particularly preferably a halogen atom is a fluorine atom.

X and Y each independently have 1 to 2 carbon atoms.
0 alkylene group, arylene group having 6 to 20 carbon atoms, silylene group, germylene group, -O-, -CO-, -S-,
—SO ₂ — or —NR ¹³ — (where R ¹³ represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or an aryl group having 6 to 12 carbon atoms), and among them, an alkylene group having 1 to 20 carbon atoms And an arylene group having 6 to 20 carbon atoms is preferred.
Examples of the alkylene group having 1 to 20 carbon atoms include a methylene group,
Dimethylmethylene group, 1,2-ethylene group, dimethyl-
1,2-ethylene group, 1,3-trimethylene group, 1,4
A tetramethylene group, a 1,2-cyclohexylene group,
Examples thereof include a 1,4-cyclohexylene group and a propylene group. Among them, a methylene group, a 1,2-ethylene group, a dimethyl-1,2-ethylene group, and a propylene group are preferred. Examples of the arylene group having 6 to 20 carbon atoms include a phenylene group, a tolylene group, a dimethylphenylene group, a trimethylphenylene group, an ethylphenylene group, a propylphenylene group, a biphenylene group, a naphthylene group, a methylnaphthylene group, an anthracenylene group, and a phenanthylene group. And the like. Of these, a phenylene group is preferred. Examples of the silylene group include a dimethylsilylene group, a diethylsilylene group, a methylphenylsilylene group, an ethylphenylsilylene group, and a diphenylsilylene group. Among them, a dimethylsilylene group, a methylphenylsilylene group, and a diphenylsilylene group are preferable. Examples of the germylene group include a dimethylgermylene group, a diethylgermylene group, a methylphenylgermylene group, an ethylphenylgermylene group, and a diphenylgermylene group. Of these, a dimethylgermylene group, a methylphenylgermylene group, and a diphenylgermylene group are preferred. Furthermore, -N
Examples of the alkyl group having 1 to 12 carbon atoms for R ¹³ in the group represented by R ¹³ — include a methyl group, an ethyl group, a propyl group,
Examples thereof include a butyl group, hexyl, cyclohexyl group, and octyl group. Or, as the aryl group having 6 to 12 carbon atoms, a phenyl group, a tolyl group, a dimethylphenyl group,
Examples include a trimethylphenyl group, an ethylphenyl group, a propylphenyl group, and a biphenyl group. Above all R
^It is preferred that ¹³ is a methyl group. In the present invention, it is particularly preferable that one of X and Y is an arylene group having 6 to 20 carbon atoms.

The onium compound represented by Z is not particularly limited, but is preferably a compound containing a cation of a carbon atom or a cation of a nitrogen atom. Specific examples of the onium compound include dimethylanilinium,
Dimethyl ammonium, methyl phenyl ammonium,
Trimethylammonium, methylanilinium, triphenylcarbonium, ferrocenium, phosphonicum, potassium, sodium, lithium and the like. Of these, dimethylanilinium and triphenylcarbonium are preferred.

[0015] Incidentally, if illustrate preferred Typical examples of the ionic compound represented by the general formula (I), In the formula, R ¹
To R ³ are each independently a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, R ^{4 to} R ¹² are each independently a halogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and X and Y are Each is independently an alkylene group having 1 to 20 carbon atoms or an arylene group having 6 to 20 carbon atoms. Z is an onium compound containing a cation of a carbon atom or a cation of a nitrogen atom, k and l are 1 or 0, and k + 1 ≧ 1.

Specific examples of the ionic compound represented by formula (I) include N, N-dimethylanilinium triphenyl-4- (4-vinylbenzyl) -phenyl borate, N, N- Dimethylanilinium triphenyl-4-
(3-vinylbenzyl) -phenylborate, N, N-dimethylanilinium triphenyl-4- (2-vinylbenzyl) -phenylborate, N, N-dimethylanilinium triphenyl-4- (4-vinylbenzyl) −2,3
5,6-tetrafluorophenyl borate, N, N-dimethylanilinium triphenyl-4- (3-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, N, N-dimethylanilinium triphenyl -4- (2
-Vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, N, N-dimethylanilinium tris (3,5-bis (trifluoromethyl) phenyl-4-
(4-vinylbenzyl) -phenylborate, N, N-dimethylanilinium tris (3,5-bis (trifluoromethyl) phenyl-4- (3-vinylbenzyl) -phenylborate, N, N-dimethylanilinium Tris (3,
5-bis (trifluoromethyl) phenyl-4- (2-
Vinylbenzyl) -phenylborate and the like.

Further, R ^{4 to} R in the general formula (I)
^As a specific example of an ionic compound in which ⁷ is a fluorine atom, N, N-dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3
5,6-tetrafluorophenyl borate, N, N-dimethylanilinium tris (pentafluorophenyl)-
4- (3-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, N, N-dimethylanilinium tris (pentafluorophenyl) -4- (2-vinylbenzyl) -2,3,5 , 6-tetrafluorophenyl borate, methyldiphenylammonium tris (pentafluorophenyl) -4- (4-vinylbenzyl)
-2,3,5,6-tetrafluorophenyl borate,
Methyldiphenylammonium tris (pentafluorophenyl) -4- (3-vinylbenzyl) -2,3
5,6-tetrafluorophenyl borate, methyldiphenylammonium tris (pentafluorophenyl)
-4- (2-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, trimethylammonium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5,6-tetra Fluorophenyl borate, trimethylammonium tris (pentafluorophenyl) -5-vinyl-2,3,9,10-tetrafluorobiphenyl borate, trimethylammonium tris (pentafluorophenyl) -4- (3-vinylbenzyl) -2, 3,5,6-tetrafluorophenyl borate, triphenylcarbonium tris (pentafluorophenyl) -6-vinyl-2,3,9,10-
Tetrafluorobiphenyl borate, triphenylcarbonium tris (pentafluorophenyl) -4- (4
-Vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, triphenylcarbonium tris (pentafluorophenyl) -4- (3-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate , Ferrocenium tris (pentafluorophenyl)
-4- (4-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, ferrocenium tris (pentafluorophenyl) -4- (3-vinylbenzyl) -2,3,5,6- Tetrafluorophenyl borate, ferrocenium tris (pentafluorophenyl)
-4- (2-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate and the like, among which
N, N-dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5,6
-Tetrafluorophenyl borate is preferred.

These ionic compounds can be synthesized by various methods. For example, a method in which a lithium compound of a vinyl halide compound and a phenylborane is treated with n-butyllithium and then reacted with an onium halide compound. Can be obtained by For example, chloromethylstyrene and lithium 2,3,5,6
By treating tetrafluorophenyltris (pentafluorophenyl) borate with n-butyllithium and then reacting with diethylanilinium chloride
N, N-dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5
6-tetrafluorobiphenyl borate can be obtained. Moreover, it can also be obtained using a Grignard reaction. For example, it can be obtained by reacting alkyl Grignard with pentafluorophenylborane and then reacting with an onium halide compound. [II] Olefin polymerization catalyst The olefin polymerization catalyst of the present invention comprises (A) a transition metal compound belonging to Groups 8 to 10 of the periodic table, (B) the ionic compound [I] and (C) an organic compound. It consists of an aluminum compound. In addition, the olefin polymerization catalyst of the present invention comprises (A)
A transition metal compound belonging to Groups 8 to 10 of the periodic table, (B) a polymer of the ionic compound [I], or a copolymer of the ionic compound [I] and a compound having a double bond; (C) It consists of an organic aluminum compound. Hereinafter, each component will be described. (A) Component (A) The transition metal compound of Groups 8 to 10 of the periodic table is not particularly limited, and can be selected widely in the range.
Preferred are those having a diimine compound as a ligand, such as those represented by the following general formula (II):

[0019]

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(Wherein R ¹⁴ and R ¹⁷ are each independently an aliphatic hydrocarbon group having 1 to 20 carbon atoms or a total of 7 to 7 carbon atoms)
An aromatic group having a hydrocarbon group on the ring 20; R ¹⁵ and R ¹⁶ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms; R ¹⁵ and R ¹⁶ are bonded to each other to form a ring; X ¹ and Y ¹ are each independently a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and M is a transition metal belonging to Groups 8 to 10 of the periodic table. )).

In the general formula (II), the aliphatic hydrocarbon group having 1 to 20 carbon atoms of R ¹⁴ and R ¹⁷ includes a linear or branched alkyl group having 1 to 20 carbon atoms or a carbon atom having 1 to 20 carbon atoms. Cycloalkyl groups of formulas 3 to 20, specifically, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl Groups, octyl, decyl, tetradecyl, hexadecyl, octadecyl, cyclopentyl, cyclohexyl, cyclooctyl and the like. An appropriate substitution difference such as a lower alkyl group may be introduced on the ring of the cycloalkyl group. In addition, the total carbon number is 7 to 20.
Examples of the aromatic group having a hydrocarbon group on the ring include those having 1 carbon atom on an aromatic ring such as a phenyl group or a naphthyl group.
And a group into which one or more linear, branched or cyclic alkyl groups of 10 to 10 have been introduced. This R ¹⁴ and R
^{As 17} , an aromatic group having a hydrocarbon group on the ring is preferable, and a 2,6-diisopropylphenyl group is particularly preferable. R ¹⁴ and R ¹⁷ may be the same or different.

Further, R ¹⁵ and R ^{16 have} 1 to 1 carbon atoms.
Examples of the hydrocarbon group having 20 carbon atoms include a linear or branched alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, and a carbon atom having 7 carbon atoms.
To 20 aralkyl groups. Here, the linear or branched alkyl group having 1 to 20 carbon atoms and the cycloalkyl group having 3 to 20 carbon atoms include the aliphatic hydrocarbon groups having 1 to 20 carbon atoms among the above R ¹ and R ^4. The same ones as exemplified in the description can be given. Examples of the aryl group having 6 to 20 carbon atoms include a phenyl group, a tolyl group, a xylyl group, a naphthyl group, and a methylnaphthyl group. Examples of the aralkyl group having 7 to 20 carbon atoms include a benzyl group and a phenethyl group. And the like. R ¹⁵ and R ¹⁶ may be the same or different. Further, they may combine with each other to form a ring.

On the other hand, X¹And Y¹Carbon number 1 of
As the hydrocarbon group of No. 20, the above R ¹⁵And R¹⁶Smell
As described above.
It is. This X¹And Y¹Is especially a methyl group
Is preferred. Also, X¹And Y ¹Are identical
Or may be different. Periodic table 8 of M
Examples of the transition metal of Group 10 include nickel and palladium.
, Platinum, iron, cobalt, rhodium, ruthenium, etc.
And nickel and palladium are preferred.

Examples of the complex compound represented by the general formula (II) include the following formulas [1], [2], [3],
[4], [5], [6], [7], [8],

[9],
The compounds represented by [10], [11] and [12] can be mentioned.

[0025]

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[0026]

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In the present invention, one of the above complex compounds may be used, or two or more of them may be used in combination.
The contact may be performed in an inert gas such as nitrogen or a hydrocarbon such as pentane, hexane, heptane, toluene, or xylene. The addition or contact of each component can be carried out at a polymerization temperature, and it is preferable that the addition or contact be carried out at a temperature between -30 ° C and the boiling point of the solvent used, particularly between room temperature and the boiling point of the solvent used. Component (B) The component (B) is a copolymer of the ionic compound [I], a polymer of the ionic compound [I], or a compound having a double bond with the ionic compound [I]. It is a polymer.

As the component (B), when one of X and Y in the general formula (I) is an arylene group having 1 to 20 carbon atoms and / or R ^{4 to} R ⁷ is a halogen atom, the component to the reactor may be used. It is preferable because adhesion is small and polymerization activity is improved. Among them, an ionic compound represented by the following general formula (III) in which R ^{4 to} R ⁷ are a fluorine atom is particularly preferable.

[0029]

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[0030] [wherein, R ¹ to R ³ each independently represent a hydrogen atom, a hydrocarbon group, halogenated hydrocarbon group or a silicon-containing group having 1 to 20 carbon atoms having 1 to 20 carbon atoms, R ⁸ ~ R
¹² each independently represent a hydrogen atom, a halogen atom, a carbon number of 1 to 2
0 represents a hydrocarbon group or a halogenated hydrocarbon group having 1 to 20 carbon atoms, and X and Y each independently represent an alkylene group having 1 to 20 carbon atoms, an arylene group having 6 to 20 carbon atoms, a silylene group, or a germylene group. , -O-, -CO-, -S-, -S
O ₂ — or —NR ¹³ — (where R ¹³ represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or an aryl group having 6 to 12 carbon atoms). Z represents an onium compound. k, l
Represents 1 or 0, and k + 1 ≧ 1. ] Where R
^{1 to} R ³ , X and Y and Z are the same as those in the general formula (I). R ⁸ to R ¹² are the same as R ⁴ to R ¹² in the general formula (I).

Specific examples of the ionic compound represented by the general formula (III) include N, N-dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5 6-tetrafluorophenyl borate, N, N-dimethylanilinium tris (pentafluorophenyl) -4- (3-vinylbenzyl) -2,3
5,6-tetrafluorophenyl borate, N, N-dimethylanilinium tris (pentafluorophenyl)-
4- (2-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, methyldiphenylammonium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5,6-tetra Fluorophenyl borate, methyldiphenylammonium tris (pentafluorophenyl) -4- (3-vinylbenzyl) -2,3,5,6-tetrafluorophenylborate, methyldiphenylammonium tris (pentafluorophenyl) -4- (2 -Vinylbenzyl) -2,
3,5,6-tetrafluorophenyl borate, trimethylammonium tris (pentafluorophenyl)-
4- (4-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, trimethylammonium tris (pentafluorophenyl) -5-vinyl-2,
3,9,10-tetrafluorobiphenyl borate, trimethylammonium tris (pentafluorophenyl) -4- (3-vinylbenzyl) -2,3,5,6-
Tetrafluorophenyl borate, triphenylcarbonium tris (pentafluorophenyl) -6-vinyl-2,3,9,10-tetrafluorobiphenyl borate, triphenylcarbonium tris (pentafluorophenyl) -4- (4-vinyl Benzyl) -2,3
5,6-tetrafluorophenyl borate, triphenylcarbonium tris (pentafluorophenyl) -4
-(3-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, ferrocenium tris (pentafluorophenyl) -4- (4-vinylbenzyl)-
2,3,5,6-tetrafluorophenyl borate, ferrocenium tris (pentafluorophenyl) -4-
(3-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate, ferrocenium tris (pentafluorophenyl) -4- (2-vinylbenzyl)-
2,3,5,6-tetrafluorophenyl borate and the like, among which N, N-dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5,6- Tetrafluorophenyl borate is preferred.

The method for producing these ionic compounds can be obtained by the above-mentioned synthesis reaction or the like. Although the ionic compound can be used as it is as a catalyst component for olefin polymerization, a polymer of the ionic compound may be used as the catalyst component. Further, a copolymer of the ionic compound with a compound having a double bond capable of forming a copolymer, or a polymer obtained by crosslinking the copolymer with a crosslinking agent may be used as the catalyst component. Good.

Examples of the compound having a double bond capable of forming a copolymer with an ionic compound include α-olefins such as ethylene, propylene, 1-butene, 1-pentene and 1-hexene, styrene and α-olefin. Methyl styrene,
pt-butylstyrene, p-chlorostyrene, m-chlorostyrene, halogenated styrenes such as o-chlorostyrene, acrylates such as divinylbenzene, methyl methacrylate and methacrylate, acrylonitrile, butadiene, 1,5-hexadiene, Vinyl acetate. Of these, divinylbenzene and styrene are preferred. These compounds may be used alone or in combination of two or more.

Polymers and copolymers of this ionic compound,
Alternatively, the copolymer obtained by crosslinking the copolymer with a crosslinking agent may be mixed with the ionic compound, the catalyst or the crosslinking agent and, if necessary, the comonomer in a solvent at a temperature of −200 ° C. to 200 ° C., preferably 30 ° C. to 100 ° C. It can be obtained by homopolymerization or copolymerization within the range. Examples of the comonomer include a compound having a double bond. As the solvent, hexane, pentane, heptane, octane, benzene, toluene, xylene, cyclohexane, methylene chloride, chloroform, 1,2-dichloroethane, chlorobenzene, bromobenzene, diethyl ether, tetrahydrofuran, 1,2-dimethoxyethane, 1, 4-dioxane, acetone, methylethyl, methanol, ethanol, t-butanol, isopropanol, acetonitrile, N, N-dimethylformamide and the like. These solvents may be used alone or in combination of two or more.

As the catalyst, azobisisobutyronitrile, benzoyl peroxide, hydrogen peroxide, boron trifluoride.
Examples include a diethyl ether complex, concentrated sulfuric acid, iodine, tin tetrachloride, perchloric acid, sodium, potassium, lithium, n-butyllithium, and liquid ammonia. Further, a Ziegler-Natta catalyst comprising a transition metal compound of titanium, zirconium, and hafnium and an organometallic compound (a)
Active catalyst (b) obtained by appropriately combining a transition metal compound, an organoaluminum compound or an electron donor with a carrier such as magnesium or magnesium chloride, or aluminoxane and a cyclopentadienyl or indenyl skeleton as a ligand Metallocene catalyst (c) comprising a combination of the above-mentioned transition metal compounds. (A) is a transition metal halide, specifically, titanium trichloride, titanium tetrachloride and the like. Examples of the organometallic compound include an organoaluminum compound, specifically, trialkylaluminum, alkylaluminum halide, and the like. Examples of (b) include the above-mentioned transition metal halides, examples of the carrier include magnesium compounds, especially magnesium halide, and examples of the electron donor include esters and ethers. Specific examples of these include Japanese Patent Publication No. 58-1
Nos. 9334, 47-41676 and 56-
Compounds described in JP-A-16167, JP-A-59-52166, JP-B-3-38285, JP-B4-75245 and the like can be mentioned. As (c), JP-A-8-511044 and JP-A-6-100
597, JP-A-6-25350, JP-A-6
Compounds described in JP-A-184179, JP-A-1-345809, JP-A-58-19309 and the like. Among these catalysts, azobisisobutyronitrile and benzoyl peroxide are preferred.

As the crosslinking agent, divinylbenzene, 1,
Examples thereof include divinyl compounds such as 5-hexadiene-3-yne, hexatriene, divinyl ether, and divinyl sulfone, and diallyl compounds such as allyl phthalate, 2,6-diacrylphenol, and diallyl carbinol. (C) Component The (C) organoaluminum compound is not particularly limited, but may be, for example, an alkyl group-containing aluminum compound represented by the following general formula (III) or a linear alkyl compound represented by the following general formula (IV) Aluminoxane or a cyclic aluminoxane represented by the following general formula (V) or an aggregate of a cyclic aluminoxane can be preferably used. R ¹⁸ _p Al (OR ¹⁹ ) _q L _3-pq (III) (wherein, R ¹⁸ and R ¹⁹ each represent a hydrogen atom or a hydrocarbon group having 1 to 20, preferably 1 to 4 carbon atoms) Show, L
Represents a halogen atom. Also, p is 0 <p ≦ 3, preferably 2 or 3, most preferably 3, and q is 0 ≦ q
<3, preferably 0 or 1)

[0037]

Embedded image (Wherein, R ²⁰ represents a hydrocarbon group such as an alkyl group, an alkenyl group, an aryl group, an arylalkyl group, etc., each having 1 to 20 carbon atoms, preferably 1 to 12 carbon atoms) or a depleted atom, and w represents an average polymerization. , And is usually an integer of 2 to 50, preferably 2 to 40. Each R ²⁰ may be the same or different.)

[0038]

Embedded image (In the formula, R ²⁰ and w are the same as those in the general formula (IV).) Specifically, trimethylaluminum, triethylaluminum, tripropylaluminum, triisobutylaluminum, tri-t-butylaluminum and the like Alkyl aluminum, dimethyl aluminum chloride,
Halogen such as diethylaluminum chloride, dimethylaluminum methoxide, diethylaluminum methoxide, dimethylaluminum hydroxide, diethylaluminum hydroxide and the like, aluminum containing a hydrogen atom such as alkylaluminum containing an alkoxy group or a hydroxyl group, dimethylaluminum hydride and diisobutylaluminum hydride And alumoxanes such as methylalumoxane, ethylalumoxane and isobutylalumoxane, among which trimethylaluminum and triisobutylaluminum are particularly preferred. These organoaluminum compounds may be used alone or in a combination of two or more.

The use ratio of each catalyst component in the present invention is not particularly limited, but the component (B) is usually used in an amount of 0.1 to 100000 mol per 1 mol of the transition metal of the component (A).
Preferably at a rate of 0.5 to 10000 mol,
The aluminum atom of the component (C) is usually 0.1 to 1000.
It is used in an amount of 00 mol, preferably 0.5 to 10000 mol. If the ratio is outside the above range, the polymerization activity may decrease.

The method for preparing the polymerization catalyst is not particularly limited, and various methods can be applied. For example, when the components (A), (B) and (C) are used, (1) After the components (A) and (B) are brought into contact with each other, (C)
Add ingredients. (2) After contacting the components (A) and (C), (B)
Add ingredients. (3) After contacting the component (C) with the component (B), the component (A)
Add ingredients. (4) A method of simultaneously contacting the three components.

Of these, preferred is (2)
This is the method. Further, in the present invention, a polymer such as polyethylene or polypropylene, or an inorganic oxide such as silica or alumina may be coexistent or brought into contact with or after each component is contacted. When supported on a carrier, it is preferable to support the polymer on a polymer. Such a carrier polymer has a particle size of 1 to 300 μm, preferably 1 to 300 μm.
It is 0 to 200 μm, more preferably 20 to 100 μm. When the particle size is smaller than 1 μm, fine particles in the polymer increase, and when the particle size exceeds 300 μm, coarse particles in the polymer increase, resulting in a decrease in bulk density and clogging of the hopper in the production process. Becomes The specific surface area of the carrier in this case is
1 to 1,000 m ² / g, preferably 50 to 500 m ²
/ G, and the pore volume is 0.1 to ⁵ m ³ / g, preferably 0.3 to ³ m ³ / g.

The contact may be carried out in an inert gas such as nitrogen, or in a hydrocarbon such as pentane, hexane, heptane, toluene and xylene. Addition or contact of each component,
The reaction can be carried out at a polymerization temperature of -30.
C. to the boiling point of each solvent, particularly from room temperature to the boiling point of the solvent. [III] Method for Producing Olefin-Based Polymer The method for producing an olefin-based polymer of the present invention uses the polymerization catalyst described above to homopolymerize olefins or olefins and other olefins and / or other olefins. Copolymerization with monomers (ie, copolymerization with different olefins, copolymerization of olefins with other monomers, or copolymerization of different olefins with other monomers) It can be suitably performed.

The olefin is not particularly limited, but is preferably an α-olefin having 2 to 20 carbon atoms. Examples of the α-olefin include ethylene, propylene, 1-butene, 3-methyl-1-butene, 4-methyl-1-butene, 4-phenyl-1-butene, 1-pentene, and 3-methyl-1- Pentene, 4-methyl-1-pentene, 3,3-dimethyl-1-pentene, 3,4-dimethyl-1-pentene, 4,4-dimethyl-1-pentene, 1-hexene, 4-methyl-1- Hexene, 5-methyl-1-hexene, 6-phenyl-1-hexene, 1
Α-olefins such as -octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, vinylcyclohexane,
Hexafluoropropene, tetrafluoroethylene, 2
Halogen-substituted α-olefins such as fluoropropene, fluoroethylene, 1,1-difluoroethylene, 3-fluoropropene, trifluoroethylene, and 3,4-dichloro-1-butene; cyclopentene; cyclohexene; norbornene; 5-methylnorbornene , 5-ethylnorbornene, 5-propylnorbornene, 5,6-
Cyclic olefins such as dimethylnorbornene and 5-benzylnorbornene;
-Methylstyrene, p-ethylstyrene, p-propylstyrene, p-isopropylstyrene, p-butylstyrene, p-tert-butylstyrene, p-phenylstyrene, o-methylstyrene, o-ethylstyrene, o
-Propylstyrene, o-isopropylstyrene, m-
Methyl styrene, m-ethyl styrene, m-isopropyl styrene, m-butyl styrene, mesityl styrene,
Alkylstyrenes such as 2,4-dimethylstyrene, 2,5-dimethylstyrene and 3,5-dimethylstyrene, p-methoxystyrene, o-methoxystyrene, m
Alkoxystyrenes such as -methoxystyrene, p-chlorostyrene, m-chlorostyrene, o-chlorostyrene, p-bromostyrene, m-bromostyrene, o-bromostyrene, p-fluorostyrene, m-fluorostyrene, o Halogenated styrenes such as -fluorostyrene and o-methyl-p-fluorostyrene; and further, trimethylsilylstyrene, vinyl benzoate, divinylbenzene and the like. The other olefins described above may be appropriately selected from the olefins.

In the present invention, the above olefins may be used alone or in combination of two or more. When copolymerizing two or more olefins, the above olefins can be arbitrarily combined. Also,
In the present invention, the above olefins and other monomers may be copolymerized. Examples of other monomers used in this case include butadiene, isoprene, 1,4-pentadiene, and 1,5-pentadiene. Chain diolefins such as hexadiene, norbornene, 1,4,5,8-dimethano-1,
Polycyclic olefins such as 2,3,4,4a, 5,8,8a-octahydronaphthalene and 2-norbornene, cyclic diolefins such as norbornadiene, 5-ethylidene norbornene, 5-vinylnorbornene and dicyclopentadiene; Examples include unsaturated esters such as ethyl acrylate and methyl methacrylate.

The method for polymerizing olefins is not particularly limited, and may be a slurry polymerization method, a solution polymerization method,
Any polymerization method such as a gas phase polymerization method, a bulk polymerization method, and a suspension polymerization method can be employed. When a polymerization solvent is used, the solvent may be benzene, toluene, xylene, n-hexane, n-heptane, cyclohexane, methylene chloride, chloroform, 1,2-dichloroethane,
Examples thereof include hydrocarbons such as chlorobenzene and halogenated hydrocarbons. These may be used alone or in combination of two or more. Further, the monomers used for the polymerization may be used depending on the type.

The amount of the catalyst used in the polymerization reaction is as follows:
The component (A) is usually contained in an amount of 0.5 to 1 per liter of the solvent.
It is advantageous from the viewpoints of polymerization activity and reactor efficiency to select from 00 micromol, preferably from 2 to 25 micromol. As for the polymerization conditions, the pressure is usually selected from the range of normal pressure to 2000 kg / cm ² G. The reaction temperature is usually in the range of -50 to 250C. Examples of the method for adjusting the molecular weight of the polymer include the type and amount of each catalyst component, the selection of the polymerization temperature, and the introduction of hydrogen.

Further, at the time of polymerization of the olefin in the present invention, preliminary polymerization can be carried out using the above catalyst. This prepolymerization can be carried out by bringing a small amount of olefin into contact with the solid catalyst component.
The temperature is -20 to 100C, preferably -10 to 70C, particularly preferably 0 to 50C. As a solvent used in the prepolymerization, an inert hydrocarbon, an aliphatic hydrocarbon, an aromatic hydrocarbon, or a monomer is used, and an aliphatic hydrocarbon is particularly preferable. This prepolymerization can also be performed without a solvent. The prepolymerized product is preferably subjected to an intrinsic viscosity [η] (measured at 135 ° C. in decalin) of 0.2 deciliter / g, preferably 0.5 deciliter / g or more. The amount of the prepolymerized product per 1 mmol of the transition metal component in the catalyst is from 1 to 10,000.
It is preferable to adjust the conditions so as to be 0 g, preferably 10 to 1,000 g.

[0048]

[Example 1]

(1) Synthesis of lithium 2,3,5,6-tetrafluorophenyltris (pentafluorophenyl) borate 1-bromo- was added to a 300 mL Schlenk under a nitrogen stream.
2,3,5,6-tetrafluorobenzene (2.0 g,
8.8 mmol) and dehydrated diethyl ether (50 m
L) was added. One hour later, a hexane solution of n-butyllithium (1.47 M, 6.0 mL) was placed in the Schlenk.
Was slowly added at -78 ° C. One hour later, tris (pentafluorophenyl) borane (4.
5 g, 8.8 mmol) in hexane (150 mmol)
Was slowly added. Thereafter, the temperature was raised to room temperature and stirred for 2 hours. After completion of the reaction, the solution was filtered off using a cannula, and the residue was washed with dehydrated hexane (100 mL).
By washing twice, the target product was obtained with a yield of 99%.
(5.8 g) (2) N, N-dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,
Synthesis of 3,5,6-tetrafluorophenyl borate p-chloromethylstyrene (0.114 g, 0.75 mmol) and dehydrated tetrahydrofuran (5 mL) were charged into a 300 mL Schlenk under a nitrogen stream. Among them, lithium 2,3,5,6-tetrafluorophenyltris (pentafluorophenyl) borate (0.50 g, 0.7
5 mmol) and dehydrated tetrahydrofuran (15 m
L) was added thereto, and a hexane solution of n-butyllithium (1.55M, 0.48 mL) was slowly added at -78 ° C, and the solution stirred for 1 hour was charged at -78 ° C using a cannula. After 1.5 hours, the reaction vessel was returned to room temperature, and the solvent was distilled off under reduced pressure. Dehydrated methylene chloride (10 mL) and dimethylanilinium chloride (0.118 g, 0.75 mmol) were added to the obtained residue, and the mixture was stirred at room temperature for 1 hour. After completion of the reaction, the solvent was distilled off, and the residue was dried twice with degassed water (20 mL) and dried with hexane (50 ml).
L), and the obtained solid was dried at room temperature under reduced pressure to obtain the desired product in a yield of 96%. Example 2 400 mL of toluene and 1.0 mm of trimethylaluminum were placed in a 1.6-liter autoclave.
ol, a heptane suspension of N, N-dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate obtained in Example 1 (10 μmol / L (converted to borane), 0.4 mL), Ni complex [11] 2.0 μmo
l at a time and ethylene at 40 ° C. with a pressure of 8 kg / cm.
Polymerization was carried out for 2 hours while continuously supplying ^{2 so as} to be maintained. Thereafter, the polymerization reaction was stopped by adding methanol. The polymer was separated by filtration and dried at 90 ° C. under reduced pressure for 12 hours. As a result, 6.5 g of a polymer was obtained. The activity per catalyst metal was 27.69 kg / gNi · h. The obtained polymer was excellent in powder properties, narrow in particle size distribution, and no adhesion of the polymer to the reactor wall was observed. [Example 3] Synthesis of crosslinked copolymer of styrene and N, N-dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate Toluene (5 mL), azobisisobutyronitrile (0.025 g), styrene (0.234) were placed in a 20 mL three-necked flask equipped with a magnetic stirrer under a nitrogen stream.
g, 2.25 mmol), N, N-dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5,6-tetrafluorophenyl borate (0.65 g, 0.72 mmol) ), And a toluene solution of divinylbenzene (70 wt%, 0.0
3 mL). Then, at 80 ° C under nitrogen stream, 2
The mixture was heated and stirred for hours. After the completion of the reaction, the reaction product was washed three times with toluene (10 mL). The residue was dried at 80 ° C. under reduced pressure, crushed in a glove box using a mortar,
The desired product was obtained with a powder (0.6 g). Example 4 400 mL of toluene and 1.0 mm of trimethylaluminum were placed in a 1.6-liter autoclave.
ol, the crosslinked poly (styrene-co-
Dimethylanilinium tris (pentafluorophenyl) -4- (4-vinylbenzyl) -2,3,5,6-
Heptane suspension of tetrafluorophenyl borate) (10 μmol / L (borane conversion value), 0.4 mL),
2.0 μmol of Ni complex [11] is sequentially charged, and the temperature is 40 ° C.
The polymerization was carried out for 2 hours while continuously supplying ethylene at a pressure of 8 kg / cm ² . Thereafter, the polymerization reaction was stopped by adding methanol. The polymer was separated by filtration and dried at 90 ° C. under reduced pressure for 12 hours. As a result, 6.0 g of a polymer was obtained. The activity per catalyst metal was 25.56 kg / gNi · h. The obtained polymer was excellent in powder properties and narrow in particle size distribution, and no adhesion of the polymer to the reactor wall was observed. Example 5 An experiment was performed in exactly the same manner as in Example 3 except that [12] was used instead of the Ni complex [11].
As a result, 6.1 g of a polymer was obtained. The activity per catalyst metal was 25.77 kg / gNi · h.

The obtained polymer was excellent in powder properties and narrow in particle size distribution, and no adhesion of the polymer to the reactor wall was observed. [Comparative Example 1] A stainless steel pressure-resistant autoclave with an internal volume of 1.4 liters equipped with a stirrer was heated to 55 ° C, dried sufficiently under reduced pressure, returned to atmospheric pressure with dry nitrogen, and cooled to room temperature. Then, dry deoxygenated toluene 40 under a dry nitrogen stream.
0ml and trimethylaluminum 1.0mmo
l. Then, a heptane suspension of borane of poly (styrene-co-trimethylammonium tris (pentafluorophenyl) -4-vinyl borate) (10:90 mol%) prepared according to the examples described in JP-A-8-143617. (Converted value: 10 mmol)
And 0.4 ml of the complex compound [11]
2.0 μmol was charged into the autoclave. Thereafter, ethylene was continuously supplied at a gauge pressure of 8 kg / cm ² , the temperature was raised to 40 ° C., and polymerization was performed for 2 hours. afterwards,
The polymerization reaction was stopped by addition of methanol. The polymer was separated by filtration and dried at 90 ° C. under reduced pressure for 12 hours. As a result, 4.0 g of a polymer was obtained. The activity per catalyst metal was 17.0 kg / gNi · h.

[0050]

Industrial Applicability The ionic compound of the present invention is useful as a co-catalyst for olefin polymerization, and according to the method for producing an olefin polymerization catalyst and olefin polymer of the present invention, there is no adhesion to the reactor wall. It is highly active, and an olefin polymer can be industrially advantageously obtained.

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 4H048 AA01 AA03 AB40 VA11 VA20 VA30 VA40 VA75 VB10 4J028 AA01A AB00A AB01A AC01A AC27A AC45A AC46A AC47A AC48A BA02A BB01A BC12A BC15A BC16A BC17A BC25A BCACACAA CAACACAA CABCACAA EB02 EB04 EB05 EB07 EB09 EB10 EB13 EB14 EB16 EB17 EB18 EB21 EB22 FA01 FA02 FA03 FA04 FA06 FA07 GA24 GB01 4J100 AA02P AA03P AA04P AA07P AA09P AA15P AA16P AA17P AA18P AA19P AA20P AA21P AB01P AB02P AB04P AB07P AB08P AB09P AB10P AB16P AC01P AC22P AC24P AC25P AC26P AC27P AL03Q AR04P AR05P AR09P AR09Q AR11P AR11Q AR21Q AR22Q AS02Q AS03Q AS11Q AS15Q AU21Q BA05P BA20P BA72P BC43P CA01 CA04 FA09

Claims (8)

[Claims] 1. An ionic compound represented by the following general formula (I). Embedded image [Wherein, R ^{1 to} R ³ each independently represent a hydrogen atom,
20 represents a hydrocarbon group, a halogenated hydrocarbon group having 1 to 20 carbon atoms or a silicon-containing group, and R ^{4 to} R ¹² each independently represent a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms or a carbon atom; Represents a halogenated hydrocarbon group of Formulas 1 to 20,
X and Y each independently represent an alkylene group having 1 to 20 carbon atoms;
Arylene group having 6 to 20 carbon atoms, silylene group, germylene group, -O -, - CO -, - S -, - SO ₂ - or -
NR ¹³ — (where R ¹³ represents a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or an aryl group having 6 to 12 carbon atoms). Z represents an onium compound. k and l represent 1 or 0, and k + 1 ≧ 1. ] 2. An olefin polymerization catalyst comprising (A) a transition metal compound belonging to Groups 8 to 10 of the periodic table, (B) the ionic compound according to claim 1, and (C) an organoaluminum compound. 3. A compound of (A) a transition metal of Groups 8 to 10 of the periodic table, (B) a polymer of the ionic compound of (1), or a double bond with the ionic compound of (1). An olefin polymerization catalyst comprising a copolymer with a compound having the same and an organoaluminum compound (C). 4. The olefin polymerization catalyst according to claim 2, wherein the component (A) is a nickel or palladium complex having a diimine compound as a ligand. 5. The olefin polymerization catalyst according to claim 2, wherein one of X and Y in the general formula (I) is an arylene group having 6 to 20 carbon atoms. 6. The olefin polymerization catalyst according to claim 2, wherein R ^{4 to} R ⁷ in the general formula (I) are halogen atoms. 7. A method for producing an olefin polymer, comprising polymerizing an olefin in the presence of the catalyst for olefin polymerization according to any one of claims 2 to 6. 8. The method for producing an olefin polymer according to claim 6, wherein the olefin is propylene.