JP2001233879A - Magnesium compound, olefin polymerization catalyst and method for producing olefin polymer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an olefin polymerization catalyst giving an olefin polymer having a high bulk density and narrow particle size distribution without reducing its performance such as a stereoregularity, polymerization activity, etc. SOLUTION: This olefin polymerization catalyst consists of (A) a solid catalyst component obtained by bringing a magnesium compound obtained by reacting a halogen and/or halogen-containing compound containing metallic magnesium, an alcohol and >=0.0001 g atom halogen atom based on 1 g atom magnesium at 30-60 deg.C, in contact with a titanium compound and (B) an organometallic compound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnesium compound suitable as a carrier for an olefin polymerization catalyst, an olefin polymerization catalyst using the compound, and a method for producing an olefin polymer. The present invention relates to a magnesium compound, an olefin polymerization catalyst, and a method for producing an olefin polymer, which give an olefin polymer having a high bulk density and a narrow particle size distribution without lowering.

[0002]

2. Description of the Related Art Conventionally, as a catalyst for homopolymerizing or copolymerizing ethylene or propylene, a technique of using magnesium chloride or magnesium alkoxide as a raw material for an olefin polymerization catalyst without pulverizing the catalyst has been widely practiced. And the form of the polymer powder are improved. For example, a method of further supporting a magnesium compound on an inorganic oxide such as silica for the purpose of improving the morphology of the formed polymer such as particle diameter and shape (Japanese Patent Application Laid-Open No. 63-280707, etc.) (See JP-A-56-811, etc.), etc., are known, but a supporting treatment, a dissolution and a precipitation treatment are indispensable. However, there is a problem that the catalyst becomes extremely complicated and the performance stability of the catalyst is also lacking. Further, a method has been developed in which a magnesium compound obtained by reacting metallic magnesium, alcohol and a specific amount of halogen is used as a carrier (Japanese Patent Laid-Open No. 4-130107, etc.). , Particle size distribution, etc.) were not always sufficient.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made from the above viewpoint, and provides an olefin polymer having a high bulk density and a narrow particle size distribution without deteriorating performance such as stereoregularity and polymerization activity. An object of the present invention is to provide a method for producing a magnesium compound, an olefin polymerization catalyst, and an olefin polymer.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, it has been found that an amount of 0.0001 gram atom or more per gram atom of metallic magnesium, alcohol and magnesium. A solid catalyst component obtained by contacting a specific magnesium compound, a titanium compound and, if necessary, an electron-donating compound obtained by reacting a halogen containing a halogen atom and / or a halogen-containing compound under specific temperature conditions with an organic compound; The present inventors have found that an olefin polymerization catalyst comprising an aluminum compound can achieve the object, and based on this, have completed the present invention. That is, the present invention provides the following methods for producing a magnesium compound, an olefin polymerization catalyst, and an olefin polymer. 1. A magnesium compound obtained by reacting a metal magnesium, an alcohol, and a halogen and / or a halogen-containing compound containing a halogen atom in an amount of 0.0001 gram atom or more per gram atom of magnesium at 30 to 60 ° C. 2. 2. The magnesium compound according to the above 1, wherein the halogen is iodine. 3. 3. The magnesium compound according to the above 1 or 2, wherein the halogen-containing compound is magnesium chloride. 4. A solid magnesium compound substantially consisting of magnesium alkoxide having a particle size distribution index (P) represented by the following formula (1) in which P <4.0. P = (D ₉₀ / D ₁₀ ) (1) (D ₉₀ is 90% of the cumulative weight fraction in the particle size distribution obtained by the light transmission method in a state of being suspended in a hydrocarbon.
The particle diameter corresponding to, D ₁₀ represents the particle size of which cumulative weight fraction corresponding to 10%. ) 5. (A) (a) a solid catalyst component obtained by contacting the magnesium compound described in any one of the above 1-4 with a titanium compound represented by the following general formula (I);
An olefin polymerization catalyst comprising an organometallic compound.

Ti (OR) _n X _4-n ... (I) (wherein X is a halogen atom, and R is 1-10 carbon atoms)
Which may be the same or different from each other. n is an integer of 0-4. ) 6. (A) (a) a solid catalyst component obtained by contacting the magnesium compound according to any one of the above 1 to 4, (b) a titanium compound represented by the following general formula (I), and (c) an electron donating compound: , (B) an organometallic compound and (C)
An olefin polymerization catalyst comprising an electron-donating compound as the third component.

Ti (OR) _n X _4-n ... (I) (where X is a halogen atom, and R is 1-10 carbon atoms)
Which may be the same or different from each other. n is an integer of 0-4. ) 7. 7. A method for producing an olefin polymer, comprising polymerizing an olefin in the presence of the olefin polymerization catalyst according to the above item 5 or 6.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is a method for producing a magnesium compound, an olefin polymerization catalyst and an olefin polymer as described above. The details will be described below. [I] Magnesium Compound The magnesium compound of the present invention (hereinafter sometimes referred to as a carrier) is a halogen and / or halogen-containing compound containing 0.0001 g atom or more of halogen atoms with respect to magnesium metal, alcohol and magnesium. Is reacted at 30 to 60 ° C. In this case, the shape of the metallic magnesium is not particularly limited.
Therefore, metallic magnesium having an arbitrary particle size, for example, granular, ribbon-shaped, powdered, etc. metallic magnesium can be used. The surface state of the metallic magnesium is also not particularly limited, but it is preferable that the surface of the metallic magnesium is not coated with magnesium hydroxide or the like. Further, the type of alcohol is not particularly limited, but has 1 to 6 carbon atoms.
It is preferable to use a lower alcohol of the formula (1). In particular, use of ethanol is preferable because a solid product which significantly improves the expression of catalytic performance can be obtained. The purity and water content of the alcohol are not limited. However, when an alcohol having a high water content is used, magnesium hydroxide is formed on the surface of the metal magnesium.
It is preferred to use less than ppm of alcohol. Furthermore, in order to obtain a better morphology, the lower the water content, the more preferable it is.
m or less is desirable. The type of halogen is not particularly limited, but chlorine, bromine or iodine, particularly iodine is preferably used. There is no limitation on the type of halogen-containing compound,
Any compound can be used as long as it contains a halogen atom in its chemical formula. In this case, the kind of the halogen atom is not particularly limited, but is preferably chlorine, bromine or iodine. Further, among the halogen-containing compounds, a halogen-containing metal compound is particularly preferable. As the halogen-containing compound, specifically, MgCl ₂ , MgI
₂ , Mg (OEt) Cl, Mg (OEt) I, MgBr
₂ , CaCl ₂ , NaCl, KBr and the like can be suitably used. Among these, MgCl ₂ is particularly preferred. The state, shape, particle size, and the like of the halogen and the halogen-containing metal compound are not particularly limited, and may be any. For example, they can be used as a solution in an alcohol-based solvent (for example, ethanol). The amount of alcohol is not limited, but is preferably 2 to 100 mol, and particularly preferably 5 to 50 mol, per 1 mol of metallic magnesium.
If the amount of alcohol is too large, the yield of a magnesium compound having a good morphology may be reduced. If the amount is too small, stirring in the reaction tank may not be performed smoothly. However, it is not limited to the molar ratio. The amount of the halogen or the amount of the halogen-containing compound used is 0.1 to 1 gram atom of metallic magnesium.
It is at least 0001 gram atoms, preferably at least 0.0005 gram atoms, more preferably at least 0.001 gram atoms. When the amount is less than 0.0001 g atom, there is not much difference from the amount of the halogen used as the reaction initiator, and when the obtained magnesium compound is used as a carrier for the catalyst, the activity and the morphology of the produced polymer become poor. The upper limit of the amount of halogen used is not particularly limited, but may be appropriately selected within a range where the magnesium compound of the present invention can be obtained. Generally, it is selected in the range of less than 0.06 gram atoms. In the present invention, each of the halogen and the halogen-containing compound may be used alone or in combination of two or more. Further, a halogen and a halogen-containing compound may be used in combination. When used in combination, the total amount of halogen atoms is 0.0001 g atoms or more, preferably 0.0005 g atoms or more, more preferably 0.001 g atoms, based on 1 g of metal magnesium. More than an atom. The upper limit of the amount is not particularly limited, but may be appropriately selected within a range where the magnesium compound according to the present invention can be obtained, but is generally preferably less than 0.06 g atom. By appropriately selecting the amount of the halogen and / or the halogen-containing compound used, the particle size of the magnesium compound can be freely controlled. The reaction itself between the metal magnesium, the alcohol and the halogen and / or the halogen-containing compound can be carried out in the same manner as a known method except that the reaction temperature is limited to 30 to 60 ° C. That is, a method is generally employed in which the reaction is carried out for 10 to 30 hours until the generation of hydrogen gas is no longer observed to obtain a magnesium compound. Specifically, when iodine is used as a halogen, a method in which solid magnesium iodine is introduced into metal magnesium and alcohol, followed by heating and reaction, and a method in which an alcohol solution of iodine is dropped into metal magnesium and alcohol and then heated. And a method of dropping an alcohol solution of iodine while heating a metal magnesium or alcohol solution. Both methods are preferably performed in an inert gas (eg, nitrogen gas, argon gas) atmosphere. It is not necessary to charge all of the metal magnesium, alcohol, and halogen from the beginning, and they may be charged separately. A particularly preferred form is a method in which the alcohol is charged in its entirety from the beginning, and the magnesium metal is divided and charged several times. In this case, it is possible to prevent a temporary large amount of hydrogen gas from being generated, which is very desirable from the viewpoint of safety. Also, the size of the reaction tank can be reduced. Further, it is possible to prevent entrainment of alcohol or halogen caused by temporary mass generation of hydrogen gas. The number of divisions may be determined in consideration of the scale of the reaction tank, and is not particularly limited, but usually 5 to 10 times is preferable in view of the complexity of the operation. Needless to say, the reaction itself may be either a batch system or a continuous system. Further, as a variant, the operation of first charging a small amount of metallic magnesium into the alcohol which was initially charged in its entirety, separating and removing the product generated by the reaction in another tank, and then charging a small amount of metallic magnesium again. Can be repeated. In the present invention, it is important to carry out the above-mentioned reaction at 30 to 60 ° C., but if it is carried out in this temperature range, a magnesium compound which gives an olefin polymer having a higher bulk density and a narrower particle size distribution than conventional ones can be easily obtained. Is obtained.

When the magnesium compound obtained as described above is used for the synthesis of the following solid catalyst component (A),
A dried product may be used, or a product washed with an inert solvent such as heptane after filtration may be used. In any case, the obtained magnesium compound can be used in the following steps without pulverization or classification operation for making the particle size distribution uniform. Further, the magnesium compound of the present invention thus obtained is closer to a spherical shape than the conventional one, and has a narrow and sharp particle size distribution. Furthermore, even if each particle is taken, the sphericity is small.

Further, the magnesium compound of the present invention is in a solid form, and has a particle size distribution index (P) represented by the following formula (1) of P <4.0, and is substantially equivalent to magnesium alkoxide. Become. P = (D ₉₀ / D ₁₀ ) (1) (D ₉₀ is 90% of the cumulative weight fraction in the particle size distribution of the magnesium compound obtained by the light transmission method in a state of being suspended in the hydrocarbon. the particle diameter corresponding to, D ₁₀ represents the particle size of which cumulative weight fraction corresponding to 10%.) P (also referred to as a particle size distribution index) shows the spread degree of particle size distribution, this value The smaller the particle size, the narrower and sharper the particle size distribution, which means that many particles having a uniform particle size are contained. As the solid magnesium compound, it is particularly preferable that P <3.8.

Further, the solid magnesium compound has a sphericity (S) represented by the following formula (2): S <S
It is preferably 2.0. S = (L ₁ / L ₂ ) ³ (2) (L ₁ is the longest diameter in the projected view of the magnesium compound, which is obtained by photographing with a scanning electron microscope and performing image processing, L
₂ indicates the diameter of a circle equal to the projected area of the magnesium compound. ) S indicates the spherical degree of the object, and S = 1
Represents a true sphere. Therefore, as S is closer to 1, it means that each particle of the magnesium compound is closer to a true sphere. As the solid magnesium compound, S <
Particularly preferred is 1.5.

Further, the solid magnesium compound is
The average particle size is usually from 10 to 100 μm, but when the average particle size is substantially the same, the S is smaller and closer to a true sphere than a conventional magnesium compound. Examples of the solid magnesium compound include a magnesium compound obtained by the above-described production method. [II] Olefin polymerization catalyst The olefin polymerization catalyst of the present invention comprises (A) (a) the above magnesium compound, (b) a titanium compound represented by the following general formula (I) and, if necessary, (c) an electron donating compound. And a catalyst comprising (B) an organometallic compound and, if necessary, (C) an electron-donating compound as a third component.

Ti (OR) _n X _4-n ... (I) (where X is a halogen atom, and R is 1-10 carbon atoms)
Which may be the same or different from each other. n is an integer of 0-4. Hereinafter, each component will be described. Component (A) The component (A) comprises (a) the above magnesium compound and (b)
It is a solid catalyst component obtained by contacting the titanium compound represented by the general formula (I) and, if necessary, (c) an electron-donating compound. (A) Component The (a) component is the above magnesium compound. (B) Component The component (b) is a titanium compound represented by the above general formula (I). In the above general formula (I), X represents a halogen atom, among which a chlorine atom and a bromine atom are preferable, and a chlorine atom is particularly preferable. R is a hydrocarbon group, may be a saturated group or an unsaturated group, may be a linear group, a group having a branched chain, or may be a cyclic group, and further includes sulfur, nitrogen, It may have a heteroatom such as oxygen, silicon, and phosphorus. Preferably, a hydrocarbon group having 1 to 10 carbon atoms, particularly an alkyl group, an alkenyl group, a cycloalkenyl group, an aryl group, an aralkyl group, and the like are preferable, and a linear or branched alkyl group is particularly preferable. When a plurality of -ORs are present, they may be the same or different from each other. As a specific example of R,
Methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, isobutyl group,
n-pentyl group, n-hexyl group, n-heptyl group, n
-Octyl group, n-decyl group, allyl group, butenyl group,
Examples include a cyclopentyl group, a cyclohexyl group, a cyclohexenyl group, a phenyl group, a tolyl group, a benzyl group, and a phenethyl group. n shows the integer of 0-4. Specific examples of the titanium compound represented by the general formula (I) include:
Tetramethoxytitanium, tetraethoxytitanium, tetra-n-propoxytitanium, tetraisopropoxytitanium, tetra-n-butoxytitanium, tetraisobutoxytitanium, tetracyclohexyloxytitanium, tetraphenoxytitanium, etc .; Titanium tetrahalides such as titanium tetrabromide and titanium tetraiodide; methoxytitanium trichloride, ethoxytitanium trichloride, n-propoxytitanium trichloride,
trihalogenated alkoxytitanium such as n-butoxytitanium trichloride and ethoxytitanium tribromide; dimethoxytitanium dichloride, diethoxytitanium dichloride,
Dihalogenated dialkoxytitaniums such as diisopropoxytitanium dichloride, di-n-propoxytitanium dichloride, diethoxytitanium dibromide; trimethoxytitanium chloride, triethoxytitanium chloride, triisopropoxytitanium chloride, tri-n-propoxytitanium chloride , Tri-n-butoxytitanium chloride and the like. Among these, a titanium compound having a high halogen content, particularly titanium tetrachloride, is preferred. These titanium compounds may be used alone or in combination of two or more. (C) Electron-donating compound In the present invention, (c) an electron-donating compound is used as necessary. Use of an electron-donating compound is preferable because the stereoregularity of the obtained olefin polymer is improved. This (c)
Examples of the electron donating compound include alcohols, phenols, ketones, aldehydes, carboxylic acids, malonic acids,
Oxygen-containing electron donating compounds such as esters of organic acids or inorganic acids, ethers such as monoethers, diethers and polyethers, and nitrogen-containing electron donating compounds such as ammonia, amines, nitriles and isocyanates. . Among these, esters of polycarboxylic acids are preferred, and esters of aromatic polycarboxylic acids are more preferred. Particularly, esters of aromatic dicarboxylic acids are preferred. Further, an aliphatic hydrocarbon in which the organic group in the ester portion is linear, branched or cyclic is preferable. Specifically, phthalic acid, naphthalene-1,2-dicarboxylic acid, naphthalene-2,3-dicarboxylic acid, 5,6,7,
8-tetrahydronaphthalene-1,2-dicarboxylic acid,
Methyl dicarboxylic acid such as 5,6,7,8-tetrahydronaphthalene-2,3-dicarboxylic acid, indane-4,5-dicarboxylic acid, indane-5,6-dicarboxylic acid,
Ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,1-dimethylpropyl, 1-methylpentyl, 2-methylpentyl , 3-methylpentyl, 4-methylpentyl, 1-
Ethyl butyl, 2-ethyl, n-hexyl, cyclohexyl, n-heptyl, n-octyl, n-nonyl, 2-
Methylhexyl, 3-methylhexyl, 4-methylhexyl, 2-ethylhexyl, 3-ethylhexyl, 4-
Examples include dialkyl esters such as ethylhexyl, 2-ethylpentyl, and 3-ethylpentyl. Among them, phthalic acid diesters are preferable, and a linear or branched fatty acid hydrocarbon having 4 or more carbon atoms in the organic group in the ester portion is preferable. The (A) solid catalyst component includes the above (a) magnesium compound, (b) titanium compound,
It can be obtained by contacting (c) an electron donating compound if necessary and further (d) a halide such as silicon tetrachloride if necessary. Good. Preferably, it is a method of contacting and reacting in the following amounts, conditions and procedures. (B) above
The amount of the titanium compound to be used is generally 0.5 to 1 with respect to 1 mol of magnesium of the magnesium compound (a).
It is good to be in the range of 00 mol, preferably 1 to 50 mol. The amount of the electron-donating compound (c) used is
Usually, 0.01 to 10 mol, preferably 1 mol, per 1 mol of magnesium of the above (a) magnesium compound,
It is good to make it into the range of 0.05 to 0.15 mol. Further, as the halide (d), silicon tetrachloride, silicon tetrabromide, tin tetrachloride, tin tetrabromide, hydrogen chloride and the like can be mentioned, among which silicon tetrachloride is preferable. The contact temperature is usually -20 to 200C, preferably 20 to 200C.
The contact temperature is preferably in the range of 150 ° C., and the contact time is usually in the range of 1 minute to 24 hours, preferably 10 minutes to 6 hours. This contact procedure is not particularly limited. For example, each component may be contacted in the presence of an inert solvent such as a hydrocarbon, or each component may be contacted after being diluted with an inert solvent such as a hydrocarbon. Examples of the inert solvent include aliphatic hydrocarbons such as n-pentane, isopentane, n-hexane, n-heptane, n-octane and isooctane; aromatic hydrocarbons such as benzene, toluene and xylene, and mixtures thereof. Can be mentioned. In addition, it is preferable that the titanium compound is contacted twice or more to sufficiently support the magnesium compound serving as a catalyst carrier. The solid catalyst component obtained by the above contact is
It may be washed with an inert solvent such as a hydrocarbon. This inert solvent may be the same as described above. Further, the solid catalyst component can be stored in a dry state or in an inert solvent such as a hydrocarbon. Component (B) The component (B) is an organoaluminum compound. The organoaluminum compound is not particularly limited, but preferred are those having an alkyl group, a halogen atom, a hydrogen atom, an alkoxy group, aluminoxanes, and mixtures thereof. Specifically, trialkylaluminums such as trimethylaluminum, triethylaluminum, triisopropylaluminum, triisobutylaluminum and trioctylaluminum; dialkyls such as diethylaluminum monochloride, diisopropylaluminum monochloride, diisobutylaluminum monochloride and dioctylaluminum monochloride Aluminum monochloride; alkyl aluminum sesquihalides such as ethyl aluminum sesquichloride;
A chain aluminoxane such as methylaluminoxane can be exemplified. Among these organoaluminum compounds, trialkylaluminums having a lower alkyl group having 1 to 5 carbon atoms, particularly trimethylaluminum, triethylaluminum, tripropylaluminum and triisobutylaluminum are preferred. These organoaluminum compounds may be used alone or in combination of two or more. (C) Electron-donating compound In the present invention, an electron-donating compound (C) is further used as a third component, if necessary. Use of an electron-donating compound is preferable because the stereoregularity of the obtained olefin polymer is improved. As the component (C), an organosilicon compound having an alkoxy group, a nitrogen-containing compound, a phosphorus-containing compound, and an oxygen-containing compound can be used. Among them, it is particularly preferable to use an organosilicon compound having an alkoxy group. Examples of the above include trimethylmethoxysilane, triethylmethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, dicyclohexyldimethoxysilane, cyclohexylmethyldimethoxysilane, cyclohexylisobutyldimethoxysilane, cyclohexyl-1 1,1,2-trimethylpropyldimethoxysilane, α-naphthyl-1,1,2-trimethylpropyldimethoxysilane, n-tetradecanyl-1,1,2-trimethylpropyldimethoxysilane, cyclopentylmethyldimethoxysilane, cyclopentylethyldimethoxysilane, Cyclopentylpropyldimethoxysilane, cyclopentyl-t-butyldimethoxysilane, cyclopentyl- 1,1,2-trimethylpropyldimethoxysilane, dicyclopentyldimethoxysilane, cyclopentylcyclohexyldimethoxysilane, t-butylmethyldimethoxysilane, t-butylethyldimethoxysilane, t-butylpropyldimethoxysilane, di-t-butyldimethoxysilane, diisopropyl Dimethoxysilane, isopropylisobutyldimethoxysilane, γ-chloropropyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, vinyltriethoxysilane, butyltriethoxysilane, phenyltriethoxysilane, γ-aminopropyltriethoxysilane, chloro Triethoxysilane,
Ethyltriisopropoxysilane, vinyltributoxysilane, methyl-t-butoxydimethoxysilane, isopropyl-t-butoxydimethoxysilane, cyclopentyl-t-butoxydimethoxysilane, 1,1,2-trimethylpropyltrimethoxysilane, ethyl silicate ,
Examples include butyl silicate, trimethylphenoxysilane, methyltriaryloxysilane, vinyltris (β-methoxyethoxy) silane, vinyltrisacetoxysilane, and dimethyltetraethoxydisiloxane. Each of these organosilicon compounds may be used alone,
Two or more kinds may be used in combination.

The amount of the catalyst component used is not particularly limited, but (A) the solid catalyst component is usually 0.0005 to ⁵ per dm ^{3 of} reaction volume in terms of titanium atoms.
An amount such that the amount is in the range of 1 mmol is used, and the (B) organometallic component has an aluminum / titanium atomic ratio of usually 1 to 1.
An amount is used that is in the range of 10,000, preferably 10-1000. If the atomic ratio is outside the above range, the catalytic activity may be insufficient. The amount of the electron donating compound (C) is such that the molar ratio of the electron donating compound / organoaluminum compound is usually in the range of 0.02 to 2.0, preferably 0.05 to 1.0. Used. If the molar ratio is outside the above range, sufficient catalytic activity may not be obtained. [III] Production method of olefin polymer The production method of the olefin polymer of the present invention is a method of polymerizing an olefin in the presence of the above-mentioned olefin polymerization catalyst. The olefin used in the present invention is not particularly limited, but α-olefin represented by the following general formula (II) R ¹ —CH ＝ CH ₂ (II) is preferable. In the above general formula (II), R ¹ is a hydrogen atom or a hydrocarbon group, and the hydrocarbon group may be a saturated group or an unsaturated group, or may have a linear or branched chain. Or a ring. Specifically, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 3-methyl-1-
Penten, 4-methyl-1-pentene, vinylcyclohexane and the like can be mentioned. These olefins may be used alone or in combination of two or more. Among the olefins, propylene is particularly preferred. Further, the polymerization may be homopolymerization or copolymerization. Among them, homopolymerization of propylene or propylene and ethylene and / or C4-20
And α-olefins (1-butene, 1-hexene, etc.) are preferred. Furthermore, if necessary, dienes such as butadiene and other various olefins can be used. In the polymerization of the olefin in the present invention, if necessary, the olefin may be preliminarily polymerized, and then the main polymerization may be performed. Examples of the prepolymerization include a method in which the olefin is prepolymerized in the presence of the catalyst at a temperature usually in the range of 0 to 100 ° C and a pressure of normal pressure to about 5 MPa. The polymerization time is 1 minute to 10 hours, preferably 10 minutes to 5 hours. The pre-polymerization amount is usually 0.1 to 1000% by weight, preferably 1 to 1000% by weight, based on the solid catalyst component.
Polymerize up to 500% by weight. Examples of the olefin used for the prepolymerization include the above-mentioned α-olefin. The same α-olefin as that used in the main polymerization is preferred. Next, the olefin is fully polymerized in the presence of the catalyst and the prepolymerized product. The type of polymerization in the main polymerization is not particularly limited, and can be applied to any of solution polymerization, slurry polymerization, gas phase polymerization, bulk polymerization and the like. Further, the present invention is applicable to both batch polymerization and continuous polymerization. Two-stage polymerization under different conditions and ethylene, 1-butene, 1-
Block polymerization may be performed using an α-olefin such as hexene. Furthermore, it is applicable to multi-stage polymerization. Further, regarding the reaction conditions, the polymerization pressure is not particularly limited, and is usually from atmospheric pressure to 8 MPa, preferably from 0.2 to 5 MPa.
The MPa and the polymerization temperature are appropriately selected in the range of usually 20 to 90 ° C, preferably 40 to 90 ° C. The polymerization time depends on the type of the starting olefin and the polymerization temperature and cannot be determined unconditionally, but is usually about 5 minutes to 20 hours, preferably about 10 minutes to 10 hours. The molecular weight can be adjusted by adding a chain transfer agent, preferably by adding hydrogen. Further, an inert gas such as nitrogen may be present. Further, as for the catalyst component in the present invention, the component (A), the component (B) and the component (C) may be mixed at a predetermined ratio, brought into contact with each other, and then an olefin may be immediately introduced to carry out polymerization. And after contact, 0.2-3
After aging for about an hour, polymerization may be carried out by introducing an olefin. Further, this catalyst component can be supplied by suspending in an inert solvent, an olefin or the like. In the present invention, post-treatment after polymerization can be carried out by a conventional method. That is, in the gas phase polymerization method, after polymerization, the polymer powder derived from the polymerization vessel may be passed through a nitrogen gas stream or the like in order to remove olefins and the like contained therein, or if desired. It may be pelletized by an extruder accordingly, in order to completely deactivate the catalyst,
A small amount of water, alcohol and the like can be added. In the bulk polymerization method, after the polymerization, the monomer can be completely separated from the polymer discharged from the polymerization vessel and then pelletized. According to the present invention, an olefin polymer powder having a high bulk density and a narrow particle size distribution can be obtained without deteriorating performance such as stereoregularity and polymerization activity. For example, in the homopolymerization of propylene, a propylene homopolymer having a bulk density (kg / m ³ ) of 340 or more, preferably 380 or more, is obtained without deteriorating performance such as stereoregularity and polymerization activity. Further, the obtained propylene homopolymer has a particle size distribution index (P ′) determined by a measuring method described in detail in Examples, where P ′ <4.
0, preferably satisfying P '<3.8, and the particle size distribution is narrower than that of the conventional one. When the average particle diameter of the propylene homopolymer is substantially the same, the sphericity (S ') obtained by the measurement method described in detail in the Examples is smaller than that of the conventional one, and a powder closer to a true sphere can be obtained.

[0014]

[Example 1]

 (1) Preparation of magnesium compound 0.5 dm.^ThreeThree-necked stirrer with stirrer
122 g of ethanol dehydrated to Lasco (2.64 g
Ram atom), 0.8 g of iodine (6.3 mg atom) and
And 8 g (0.33 g atom) of metallic magnesium
And stir at 40 ° C until hydrogen is no longer generated from the system
(5.83s^-1, 350 rpm)
Compound was obtained. (2) Preparation of solid catalyst component 0.5 dm.^ThreeThree-necked stirrer with stirrer
In a Lasco, 16 g of the magnesium compound obtained in the above (1),
0.080 dm of dehydrated octane^Threeadded. 40
℃ to silicon tetrachloride 0.0024dm^Three(23mi
And then stirred for 20 minutes.
Butyl 0.0035dm^Three(13 mmol). Dissolution
The temperature of the solution is raised to 80 ° C, and then titanium tetrachloride is added dropwise.
0.062dm^Three(0.56 mol)
Was. The internal temperature was set to 125 ° C., and the mixture was stirred for 2 hours to perform a loading operation.
Thereafter, washing was performed sufficiently using dehydrated octane. further
0.107 dm of titanium tetrachloride^Three(0.98 mol)
First, the inner temperature was set to 125 ° C., and the mixture was stirred for 2 hours, and the second loading operation
And After that, wash thoroughly with dehydrated octane
A catalyst component was obtained. (3) Propylene slurry polymerization Inner volume 1dm^ThreeStainless steel autoclave with stirrer
After drying thoroughly, purging with nitrogen
0.4 dm^ThreeWas added. More triethylaluminum
2.0 mmol, followed by dicyclopentyldimethoxy
0.25 mmol of silane (DCPDMS) was added,
The solid catalyst component prepared in (2) was added in an amount of 0.00
25 mmol, hydrogen 0.1 MPa was introduced,
Lopylene was introduced. Total pressure 0.8MPa, temperature 8
The polymerization was carried out at 0 ° C. for 1 hour. Then lower the temperature and depressurize
Take out the contents, 2dm^ThreeAfter pouring into methanol
It was air-dried to obtain polypropylene. Table 1 and 2
It is shown in the table. [Comparative Example 1] (1) Preparation of magnesium compound Except that the reaction temperature was set at about 78 ° C (reflux state).
It carried out like Example 1. (2) Preparation of solid catalyst component Example 1 except that the above magnesium compound was used.
The same was done. (3) Propylene slurry polymerization Same as Example 1 except that the above solid catalyst component was used.
I went to. The results are shown in Tables 1 and 2. Particle size of carrier
The distribution index (P) exceeds 4.0 and the bulk of the obtained polymer
The density is 310 (kg / m^Three) And was low. [Example 2] (1) Preparation of magnesium compound The same procedure as in Example 1 was carried out except that the reaction temperature was 50 ° C.
Was. (2) Preparation of solid catalyst component Example 1 except that the above magnesium compound was used.
The same was done. (3) Propylene slurry polymerization Same as Example 1 except that the above solid catalyst component was used.
I went to. The results are shown in Tables 1 and 2. Example 3 (1) Preparation of Magnesium Compound The amount of iodine used was 0.24 g (1.9 mg
Child), stirring speed is 8.75s ^-1(525 rpm)
The procedure was performed in the same manner as in Example 2 except for (2) Preparation of solid catalyst component Example 1 except that the above magnesium compound was used.
The same was done. (3) Propylene slurry polymerization Same as Example 1 except that the above solid catalyst component was used.
I went to. The results are shown in Tables 1 and 2. [Comparative Example 2] (1) Preparation of magnesium compound Example was prepared except that the reaction temperature was 78 ° C (reflux state).
Performed similarly to 3. (2) Preparation of solid catalyst component Example 1 except that the above magnesium compound was used.
The same was done. (3) Propylene slurry polymerization Same as Example 1 except that the above solid catalyst component was used.
I went to. The results are shown in Tables 1 and 2. Particle size of carrier
The distribution index (P) exceeds 4.0 and the bulk of the obtained polymer
The density is 310 (kg / m^Three) And was low. [Example 4] (1) Preparation of magnesium compound_Two(0.3g, per Cl
Example 1 except that 6.3 mg atom) was used.
Performed similarly. (2) Preparation of solid catalyst component Example 1 except that the above magnesium compound was used.
The same was done. (3) Propylene slurry polymerization Same as Example 1 except that the above solid catalyst component was used.
I went to. The results are shown in Tables 1 and 2. Comparative Example 3 (1) Preparation of Magnesium Compound Example except that the reaction temperature was 78 ° C. (reflux state)
Performed similarly to 4. (2) Preparation of solid catalyst component Example 1 except that the above magnesium compound was used.
The same was done. (3) Propylene slurry polymerization Same as Example 1 except that the above solid catalyst component was used.
I went to. The results are shown in Tables 1 and 2. Particle size of carrier
The distribution index (P) exceeds 4.0 and the bulk of the obtained polymer
The density is 330 (kg / m^Three) And was low. [Example 5] (1) Preparation of magnesium compound The same procedure as in Example 1 was carried out except that the reaction temperature was 60 ° C.
Was. (2) Preparation of solid catalyst component Example 1 except that the above magnesium compound was used.
The same was done. (3) Propylene slurry polymerization Same as Example 1 except that the above solid catalyst component was used.
I went to. The results are shown in Tables 1 and 2. Example 6 (1) Preparation of Magnesium Compound The procedure was the same as in Example 1. (2) Preparation of solid catalyst component The same procedure as in Example 1 was performed. (3) Propylene slurry polymerization Dicyclopentyldimethoxysilane as silane compound
(DCPDMS) instead of cyclohexylisobutyl
Other than using dimethoxysilane (CHIBDMS)
Was performed in the same manner as in Example 1. The results are shown in Tables 1 and 2.
Show.

[0015]

[Table 1]

[0016]

[Table 2]

[0017]

According to the present invention, an olefin polymer having a high bulk density and a narrow particle size distribution can be obtained without impairing the performance such as stereoregularity and polymerization activity.

[Brief description of the drawings]

FIG. 1 is a flow chart showing one embodiment of the olefin polymerization of the present invention.

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Claims (7)

[Claims] 1. A magnesium obtained by reacting a metal magnesium, an alcohol and a halogen and / or a halogen-containing compound containing a halogen atom in an amount of 0.0001 g atom or more per 1 g atom of magnesium at 30 to 60 ° C. Compound. 2. The magnesium compound according to claim 1, wherein the halogen is iodine. 3. The magnesium compound according to claim 1, wherein the halogen-containing compound is magnesium chloride. 4. A solid magnesium compound substantially consisting of magnesium alkoxide having a particle size distribution index (P) represented by the following formula (1), wherein P <4.0. P = (D ₉₀ / D ₁₀ ) (1) (D ₉₀ is 90% of the cumulative weight fraction in the particle size distribution of the magnesium compound obtained by the light transmission method in a state of being suspended in the hydrocarbon. the particle diameter corresponding to, D ₁₀ represents the particle size of which cumulative weight fraction corresponding to 10%.) 5. A solid catalyst component obtained by contacting (A) (a) the magnesium compound according to any one of claims 1 to 4 with (b) a titanium compound represented by the following general formula (I): B) An olefin polymerization catalyst comprising an organometallic compound. Ti (OR) _n X _4-n ... (I) (where X is a halogen atom, and R is 1-10 carbon atoms)
Which may be the same or different from each other. n is an integer of 0-4. ) (A) (a) contacting the magnesium compound according to any one of claims 1 to 4, (b) a titanium compound represented by the following general formula (I), and (c) an electron-donating compound. An olefin polymerization catalyst comprising a solid catalyst component obtained as described above, (B) an organometallic compound, and (C) an electron-donating compound as a third component. Ti (OR) _n X _4-n ... (I) (where X is a halogen atom, and R is 1-10 carbon atoms)
Which may be the same or different from each other. n is an integer of 0-4. ) 7. A method for producing an olefin polymer in which an olefin is polymerized in the presence of the olefin polymerization catalyst according to claim 5 or 6.