JPH0649122A - Olefin polymerization catalyst and method of polymerizing olefin - Google Patents

Abstract

PURPOSE:To obtain an olefin polymerization catalyst which can be prepared easily and with which a polyolefin excellent in material properties and processability can be efficiently produced, by using a specific metallocene compound, an organic Al compound, and a metal borate at the catalyst components. CONSTITUTION:The catalyst comprises a metallocene compound represented by formula I (wherein Cp<1> and Cp<2> each is (substituted) cyclopentadienyl; R<1> is a 1-4C alkylene, a dialkylsilicon, a dialkylgermanium, an alkylphosphine, etc.; m is 0 or 1; M is titanium, zirconium, or hafnium; and X is fluorine, chlorine, bromine, or iodine) [e.g. bis(cyclopentadienyl)titanium dichloride], an organic Al compound represented by formula II (wherein R<2> is H, an alkyl, an alkoxy, etc.) (e.g. trimethylaluminum), and a metal borate represented by formula III (wherein C is the cation of an alkali (or alkaline earth) metal; L is a Lewis base; A is a boron-compound anion; n is 0-6; and b and d each is an integer).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an olefin polymerization catalyst comprising a metallocene compound, an organoaluminum compound and an ionized ionic compound, and a method for producing a polyolefin using the olefin polymerization catalyst.

[0002]

As an olefin polymerization catalyst, JP-A-3-197513 discloses that ethylene is polymerized using a metallocene compound and an organoaluminum compound as a catalyst, and JP-A-3-2904.
No. 08 discloses a method for obtaining polyethylene or an ethylene copolymer by using a zirconocene compound, an organoaluminum compound and an organomagnesium compound as a catalyst. However, although these catalysts can be used to produce polyethylene and ethylene copolymers, they are not satisfactory in terms of activity and the like regarding propylene polymerization.

Further, it is possible to produce an olefin polymer containing propylene with high activity by using a metallocene compound and methylaluminoxane as a catalyst.
As is known from Japanese Patent Publication No. 19309, etc., in this catalyst, methylaluminoxane is relatively expensive, and it is necessary to use a large amount of this methylaluminoxane during polymerization. There was a problem.

Recently, a catalyst showing high activity in the polymerization of olefins including propylene by adding an organoaluminum compound to an ionic metallocene catalyst is disclosed in JP-A-3-20.
No. 7704. Further, it is disclosed that the ionic metallocene catalyst, which is the main catalyst in this catalyst, is generally produced by the reaction of a metallocene compound and an ionized ionic compound. However, the ionizable ionic compound that is the raw material of the ionic metallocene catalyst is
Synthesized by ammonium chloride or triphenylcarbenium chloride of boric acid metal salt, many steps are required to synthesize ionized ionic compounds, and purity, reproducibility of synthesis, storage and polymerization There were many problems such as deactivation during transfer to containers.

[0005]

The present invention has been made to solve this problem, and relates to an olefin polymerization catalyst comprising a metallocene compound, an organoaluminum compound and an ionized ionic compound. Further, the present invention relates to a method for producing a polyolefin using the above-mentioned olefin polymerization catalyst.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems, and as a result, found that metal salts of boric acid, which is a raw material for metallocene compounds, organoaluminum compounds, and existing ionized ionic compounds. It was found that a polyolefin having high activity and excellent physical properties and processability can be efficiently produced by using, and the present invention has been completed.

That is, the present invention comprises (A) a metallocene compound, (B) an organoaluminum compound and (C) a metal salt of boric acid, wherein the metallocene compound (A) is represented by the following general formula (1):

[0008]

[Chemical 4] [Wherein Cp ¹ and Cp ² are each independently a cyclopentadienyl or substituted cyclopentadienyl group, and R ¹
Is an alkylene group having 1 to 4 carbon atoms, a dialkylsilicon group, a dialkylgermanium group, an alkylphosphine group or an alkylamine group, and R ¹ is Cp.
¹ acts to bridge Cp ² and m is 0
Or 1, M is titanium, zirconium or hafnium, X is fluorine, chlorine, bromine or iodine], and the organoaluminum compound (B) is represented by the following general formula (2):

[0009]

[Chemical 5] [Wherein R ² is a hydrogen, alkyl, alkoxy or aryl group, each R ² may be the same or different, and at least one R ² is an alkyl group], and a metal salt of boric acid (C) is the following general formula (3)

[0010]

[Chemical 6] [In the formula, C is an alkali metal or alkaline earth metal cation, L is a Lewis base, A is an anion containing a boron element, and n is an integer of 0 to 6,
b and d are integers selected so that the charges are balanced with each other] and a method for producing a polyolefin, which comprises polymerizing an olefin in the presence of the olefin polymerization catalyst and the above-mentioned olefin polymerization catalyst.

The present invention will be described in detail below.

The metallocene compound (A) used in the present invention is represented by the general formula (1), and specific compounds thereof include bis (cyclopentadienyl) titanium dichloride and bis (cyclopentadienyl).
Zirconium dichloride, bis (cyclopentadienyl) hafnium dichloride, bis (methylcyclopentadienyl) titanium dichloride, bis (methylcyclopentadienyl) zirconium dichloride, bis (methylcyclopentadienyl) hafnium dichloride, bis (butylcyclo) Pentadienyl) titanium dichloride, bis (butylcyclopentadienyl) zirconium dichloride, bis (butylcyclopentadienyl) hafnium dichloride, ethylenebis (indenyl) titanium dichloride, ethylenebis (indenyl) zirconium dichloride, ethylenebis (indenyl) Hafnium dichloride, isopropylidene (cyclopentadienyl-1-fluorenyl) titanium dichloride, a Propylidene (cyclopentadienyl-1-fluorenyl) zirconium dichloride,
Isopropylidene (cyclopentadienyl-1-fluorenyl) hafnium dichloride, dimethylsilylbis (2,4,5-trimethylcyclopentadienyl) titanium dichloride, dimethylsilylbis (2,4-dimethylcyclopentadienyl) titanium dichloride , Dimethylsilylbis (3-methylcyclopentadienyl) titanium dichloride, dimethylsilylbis (4-t-butyl, 2-methylcyclopentadienyl)
Titanium dichloride, dimethylsilylbis (2,
4,5-trimethylcyclopentadienyl) zirconium dichloride, dimethylsilylbis (2,4-dimethylcyclopentadienyl) zirconium dichloride,
Dimethylsilylbis (3-methylcyclopentadienyl) zirconium dichloride, dimethylsilylbis (4-t-butyl, 2-methylcyclopentadienyl)
Zirconium dichloride, dimethylsilylbis (2,
4,5-Trimethylcyclopentadienyl) hafnium dichloride, dimethylsilylbis (2,4-dimethylcyclopentadienyl) hafnium dichloride, dimethylsilylbis (3-methylcyclopentadienyl) hafnium dichloride, dimethylsilylbis (4 -T-
Butyl, 2-methylcyclopentadienyl) hafnium dichloride, diethylsilylbis (2,4,5-trimethylcyclopentadienyl) titanium dichloride, diethylsilylbis (2,4-dimethylcyclopentadienyl) titanium dichloride, diethyl Silylbis (3-methylcyclopentadienyl) titanium dichloride, diethylsilylbis (4-t-butyl, 2
-Methylcyclopentadienyl) titanium dichloride, diethylsilylbis (2,4,5-trimethylcyclopentadienyl) zirconium dichloride, diethylsilylbis (2,4-dimethylcyclopentadienyl) zirconium dichloride, diethylsilylbis ( 3-Methylcyclopentadienyl) zirconium dichloride, diethylsilylbis (4-t-butyl, 2-
Methylcyclopentadienyl) zirconium dichloride, diethylsilylbis (2,4,5-trimethylcyclopentadienyl) hafnium dichloride, diethylsilylbis (3-methylcyclopentadienyl) hafnium dichloride, diethylsilylbis (4-t -Butyl, 2-methylcyclopentadienyl) hafnium dichloride and the like, and the metallocene compounds such as difluoride, dibromide and diiodide can be exemplified.

The organoaluminum compound (B) is
It is represented by the general formula (2), and specific compounds thereof include trimethylaluminum, triethylaluminum, triisopropylaluminum, tri-n-propylaluminum, triisobutylaluminum, tri-aluminum.
n-butyl aluminum, triamyl aluminum, dimethyl aluminum ethoxide, diethyl aluminum ethoxide, diisopropyl aluminum ethoxide, di-n-propyl aluminum ethoxide, diisobutyl aluminum ethoxide, di-n-butyl aluminum ethoxide, dimethyl aluminum hydride , Diethyl aluminum hydride, diisopropyl aluminum hydride, di-n-propyl aluminum hydride, diisobutyl aluminum hydride, di-n-butyl aluminum hydride and the like.

The metal salt of boric acid (C) used in the present invention
Is represented by the general formula (3), and specific compounds thereof include lithium tetrakis (pentafluorophenyl) borate, lithium tetrakis (phenyl) borate, lithium tetrakis (p-tolyl) borate, lithium tetrakis (m-). Trilyl) borate, lithium tetrakis (2,4-dimethylphenyl) borate, lithium tetrakis (3,5-dimethylphenyl) borate,
Lithium tetrafluoroborate, sodium tetrakis (pentafluorophenyl) borate, sodium tetrakis (phenyl) borate, sodium tetrakis (p-tolyl) borate, sodium tetrakis (m-)
Tolyl) borate, sodium tetrakis (2,4-dimethylphenyl) borate, sodium tetrakis (3,5-dimethylphenyl) borate, sodium tetrafluoroborate, potassium tetrakis (pentafluorophenyl) borate, potassium tetrakis (phenyl) borate, potassium Tetrakis (p-tolyl) borate, potassium tetrakis (m-tolyl) borate,
Potassium tetrakis (2,4-dimethylphenyl) borate, potassium tetrakis (3,5-dimethylphenyl) borate, potassium tetrafluoroborate, magnesium tetrakis (pentafluorophenyl) borate, magnesium tetrakis (phenyl) borate, magnesium tetrakis (p- Tolyl) borate, magnesium tetrakis (m-tolyl) borate, magnesium tetrakis (2,4-dimethylphenyl) borate,
Magnesium tetrakis (3,5-dimethylphenyl)
Borate, magnesium tetrafluoroborate, calcium tetrakis (pentafluorophenyl) borate, calcium tetrakis (phenyl) borate, calcium tetrakis (p-tolyl) borate, calcium tetrakis (m-tolyl) borate, calcium tetrakis (2,4-dimethylphenyl) ) Borate, calcium tetrakis (3,5-dimethylphenyl) borate,
Examples thereof include calcium tetrafluoroborate and the like, ether complexes of the metal salts of boric acid, tetrahydrofuran complexes and the like.

The olefin polymerization catalyst of the present invention is obtained, for example, by mixing a metallocene compound (A) and an organoaluminum compound (B) with an olefin and contacting the mixture with a metal salt of boric acid (C). You can

The molar ratio of the metallocene compound (A) to the metal salt of boric acid (C) is not particularly limited, but is preferably m of the metallocene compound (A): metal salt of boric acid (C).
The ol ratio is preferably in the range of 1: 0.01 to 1: 1000, particularly preferably in the range of 1: 0.2 to 1: 200. The preferred concentration of the organoaluminum compound (B) used here is 1 × 10 ⁻⁵ to 1 × 10 ^5.
-3 mol / l.

The olefins used in the polymerization reaction of the present invention are ethylene, propylene, 1-butene, 4-methyl-
Α-olefins such as 1-pentene and 1-hexene, conjugated and non-conjugated dienes such as butadiene and 1,4-hexadiene, cyclic olefins such as styrene and cyclobutene, and a mixed component of two or more kinds thereof can also be used. .

The olefin polymerization in the present invention can be carried out in the liquid phase or the gas phase. The solvent in the case of carrying out the polymerization in a liquid phase may be any commonly used organic solvent, and specific examples thereof include benzene, toluene, xylene, pentane, hexane and methylene chloride.
Alternatively, the olefin itself can be used as a solvent.

The catalyst according to the invention can also be used on inert supports. This is a metallocene compound itself, a reaction product of a metallocene compound and a metal salt of boric acid, a reaction product of a metallocene compound and an organoaluminum compound,
It can be carried out by depositing the metal salt of boric acid itself or the organoaluminum compound itself on an inert carrier such as silica, alumina, magnesium chloride, styrene-divinylbenzene copolymer or polyethylene.

The solid component thus obtained is particularly advantageously used for gas phase polymerization.

The polymerization temperature is not particularly limited, but it is from -100 to
It is preferably carried out in the range of 230 ° C.

[0022]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

The polymerization operation, reaction and solvent purification were all carried out under an inert gas atmosphere. Further, as the solvent and the like used in the reaction, those which were previously purified, dried and / or deoxygenated by a known method were used. The compounds used in the reaction were those synthesized and identified by known methods.

Example 1 To a 2 l autoclave was added 500 ml of toluene, then 0.5 mmol of triisobutylaluminum,
Stir for 10 minutes. 0.5 μmol of ethylenebis (indenyl) zirconium dichloride synthesized by a known method was added to this solution as a 10 ml toluene solution,
The mixed solution was stirred for 20 minutes. Propylene 5
00 ml was inserted and stirred for 10 minutes. 2.5 μmol of diethyl ether complex of lithium tetrakis (pentafluorophenyl) borate was press-fitted into the autoclave using 10 ml of toluene, and polymerization was carried out at 40 ° C. for 1 hour. As a result, 188 g of isotactic polypropylene was obtained.

Comparative Example 1 The method of Example 1 was repeated except that 2.5 μmol of dimethylanilinium tetrakis (pentafluorophenyl) borate was used instead of the diethyl ether complex of lithium tetrakis (pentafluorophenyl) borate. As a result, 45 g of isotactic polypropylene was obtained.

Example 2 To a 2 l autoclave was added 500 ml of toluene, then 0.5 mmol of triisobutylaluminum,
Stir for 10 minutes. 10 ml of 5 μmol of isopropylidene (cyclopentadienyl-1-fluorenyl) zirconium dichloride synthesized by a known method was added to this solution.
Of toluene solution was added, and this mixed solution was stirred for 20 minutes. 500 ml of propylene was inserted into this and stirred for 10 minutes. To this, lithium tetrakis (pentafluorophenyl) borate diethyl ether complex 25 μm
Ol was pressed into the autoclave with 10 ml of toluene and polymerization was carried out at 40 ° C. for 1 hour. As a result, 110
g of syndiotactic polypropylene was obtained.

Comparative Example 2 Dimethylanilinium tetrakis (pentafluorophenyl) borate 2 was used instead of the diethyl ether complex of lithium tetrakis (pentafluorophenyl) borate.
The method of Example 2 was repeated except that 5 μmol was used. As a result, 30 g of syndiotactic polypropylene was obtained.

[0028]

As described above, according to the catalyst of the present invention and the olefin polymerization method using the same, it is possible to omit a complicated synthesis step of the catalyst component, and obtain a polyolefin having excellent physical properties and processability. It can be manufactured efficiently.

Claims (2)

[Claims] 1. A metallocene compound comprising (A) a metallocene compound, (B) an organoaluminum compound and (C) a metal salt of boric acid, wherein the metallocene compound (A) is represented by the following general formula (1): [Wherein Cp ¹ and Cp ² are each independently a cyclopentadienyl or substituted cyclopentadienyl group, and R ¹
Is an alkylene group having 1 to 4 carbon atoms, a dialkylsilicon group, a dialkylgermanium group, an alkylphosphine group or an alkylamine group, and R ¹ is Cp.
¹ acts to bridge Cp ² and m is 0
Or 1, M is titanium, zirconium or hafnium, X is fluorine, chlorine, bromine or iodine], and the organoaluminum compound (B) is represented by the following general formula (2): [Wherein R ² is a hydrogen, alkyl, alkoxy or aryl group, each R ² may be the same or different, and at least one R ² is an alkyl group], and a metal salt of boric acid (C) is the following general formula (3): [In the formula, C is an alkali metal or alkaline earth metal cation, L is a Lewis base, A is an anion containing a boron element, and n is an integer of 0 to 6,
b and d are integers selected so that the charges are balanced with each other]. 2. A method for producing a polyolefin, which comprises polymerizing an olefin in the presence of the catalyst for olefin polymerization according to claim 1.