JP4402353B2 - Method for producing dialkoxymagnesium, solid catalyst component and catalyst for olefin polymerization - Google Patents

Description

【００８４】
図２のＳＥＭ写真から明らかなように、本発明の方法により得られたジエトキシマグネシウムの表面には微粉の付着が少なく、テトラエトキシチタン処理以降の操作をしていないもの（図１のＳＥＭ写真）より表面が平滑であることがわかる。また、表１の結果から、本発明の固体触媒成分および触媒を用いてプロピレンの重合を行うことにより、高活性および高立体規則性を維持し、微粉重合体の発生が極めて少ないことがわかる。
【００８５】
【発明の効果】
本発明のジアルコキシマグネシウムの製造方法により、新規なジアルコキシマグネシウムが得られる。また、該製造方法で得られたジアルコキシマグネシウムを用いて調製したオレフィン類重合用固体触媒成分による触媒は、ポリマーの立体規則性および収率を高度に維持しながら、極めて微粉の少ない重合体を得ることができる。従って、汎用ポリオレフィンを、低コストで提供し得る。
【図面の簡単な説明】
【図１】テトラエトキシチタン処理以降の操作をしていないジエトキシマグネシウムのＳＥＭ写真である。
【図２】実施例１で製造した本発明のジエトキシマグネシウムのＳＥＭ写真である。
【図３】本発明の重合触媒を調製する工程を示すフローチャート図である。[0001]
BACKGROUND OF THE INVENTION
The present invention provides a novel dialkoxymagnesium production method and a solid catalyst component and a catalyst for olefin polymerization that can maintain a high degree of stereoregularity and yield of a polymer and can obtain a polymer with less fine powder. About.
[0002]
[Prior art]
Conventionally, in the polymerization of olefins, many solid catalyst components for olefin polymerization containing magnesium, titanium, an electron donating compound and halogen as essential components have been proposed. In particular, diethoxymagnesium is representative as a magnesium raw material. Solid catalyst components prepared using alkoxymagnesium compounds have high performance and are widely used industrially.
[0003]
For example, in Patent Document 1 (Japanese Patent Laid-Open No. 63-3010), a product obtained by contacting dialkoxymagnesium, an aromatic dicarboxylic acid diester, an aromatic hydrocarbon compound and a titanium halide is in a powder state. A method for polymerizing olefins and a solid catalyst component prepared by heat treatment with olefin, an olefin polymerization catalyst comprising an organoaluminum compound and an organosilicon compound have been proposed.
[0004]
Moreover, in patent document 2 (Unexamined-Japanese-Patent No. 1-315406), titanium tetrachloride is made to contact the suspension formed with diethoxymagnesium and alkylbenzene, and it is made to react by adding phthalic acid dichloride next. A solid catalyst component prepared by catalytically reacting the solid product with titanium tetrachloride in the presence of alkylbenzene, a catalyst for olefin polymerization comprising an organoaluminum compound and an organosilicon compound, and A process for the polymerization of olefins in the presence of a catalyst has been proposed.
[0005]
Each of the above prior arts has a high activity capable of omitting a so-called deashing step for removing catalyst residues such as chlorine and titanium remaining in the produced polymer, and also has a high degree of stereoregularity. These efforts are focused on improving the yield of coalescence and increasing the sustainability of the catalytic activity during polymerization, and each has achieved excellent results. This type of highly active catalyst component, organoaluminum compound and silicon Polymerization of olefins using a polymerization catalyst composed of an electron donating compound typified by a compound causes a fine polymer of the solid catalyst component itself and particle breakage due to heat of reaction when polymerized, resulting in a polymer produced There was a tendency to broaden the particle size distribution with a lot of fine powder contained therein. Increasing the amount of finely divided polymer prevents process continuation, causing blockage of piping during polymer transfer, etc., and widening the particle size distribution results in favorable polymer processing. As a result, the amount of fine powder polymer is as small as possible, and a polymer having a uniform particle size and a narrow particle size distribution has been sought.
[0006]
As means for solving this problem, in Patent Document 3 (Japanese Patent Laid-Open No. 6-157659), a spherical dialkoxymagnesium, an aromatic hydrocarbon compound, and phthalate are added to a mixed solution of an aromatic hydrocarbon compound and titanium tetrachloride. A catalyst for olefin polymerization using a solid catalyst component obtained by adding a suspension of an acid diester, reacting it, and further reacting with titanium tetrachloride has been proposed.
[0007]
In Patent Document 4 (JP-A-6-287225), a suspension of spherical dialkoxymagnesium, an aromatic hydrocarbon compound and a phthalic acid diester is mixed with an aromatic hydrocarbon compound and titanium tetrachloride. Olefin compounds obtained by adding to the solution and reacting, washing the resulting reaction product with an aromatic hydrocarbon compound, drying the solid component obtained by reacting again with titanium tetrachloride, and subjecting to a fine powder removal process Solid catalyst components for polymerization have been proposed.
[0008]
Further, in Patent Document 5 (Japanese Patent Laid-Open No. 6-287217), a suspension of spherical dialkoxymagnesium, aromatic hydrocarbon compound and phthalic acid diester is mixed with an aromatic hydrocarbon compound and titanium tetrachloride. In addition to the above, the reaction product obtained is washed with an aromatic hydrocarbon compound, the solid component obtained by reacting again with titanium tetrachloride is dried, subjected to fine powder removal treatment, and then powdered. A solid catalyst component for polymerizing olefins obtained through a treatment process of adding a nonionic surfactant has been proposed.
[0009]
Although the above-mentioned proposal has the effect of removing the fine powder of the solid catalyst component itself and reducing the amount of fine powder of the resulting polymer to some extent, the generation of ultrafine polymer called microfine is still in particular. The development of a catalyst with little generation of a fine polymer has been desired, but the above-described prior art is not sufficient to solve the problem.
[0010]
On the other hand, as a prior art, there is known a method of preparing a solid catalyst component by dissolving a magnesium compound such as magnesium chloride or diethoxymagnesium with an alkoxytitanium compound to form a uniform solution and then depositing it.
[0011]
For example, in Patent Document 6 (Japanese Patent Laid-Open No. 62-18405), a titanium alkoxy compound, dialkoxy magnesium, a diester of an aromatic dicarboxylic acid, a halogenated hydrocarbon compound, and a titanium halide represented by a specific formula are contacted. A catalyst component for polymerization of olefins, which is obtained by the above process and used in combination with a silicon compound and an organoaluminum compound represented by a specific formula, has been proposed.
[0012]
In Patent Document 7 (Japanese Patent Laid-Open No. 3-72503), a magnesium compound represented by a specific formula, a tetraalkyltitanium compound, and a silicon compound represented by a specific formula are subjected to a heat reaction, and then the reaction product. A solid catalyst component for polymerizing olefins obtained by treating with a halogen-containing titanium compound represented by the specific formula and an electron donating compound represented by the specific formula is disclosed.
[0013]
However, any of these conventional methods is a preparation method in which a magnesium compound is dissolved with an alkoxytitanium compound and then a solid catalyst component is precipitated, so that the process of depositing a solid from a solution of the magnesium compound is complicated. In addition, since a large amount of the alkoxytitanium compound is used in the method for preparing the solid catalyst component, there is a problem in that the alkoxytitanium compound remains in the precipitated solid, and the performance such as activity is significantly reduced.
[0014]
[Patent Document 1]
JP 63-3010 A (Claims)
[Patent Document 2]
JP-A-1-315406 (Claims)
[Patent Document 3]
JP-A-6-157659 (Claims)
[Patent Document 4]
JP-A-6-287225 (Claims)
[Patent Document 5]
JP-A-6-287217 (Claims)
[Patent Document 6]
JP-A-62-18405 (Claims)
[Patent Document 7]
Japanese Patent Laid-Open No. 3-72503 (Claims)
[0015]
[Problems to be solved by the invention]
That is, an object of the present invention is to provide a dialkoxymagnesium production method capable of obtaining a novel dialkoxymagnesium, and the stereoregularity of the polymer when prepared using the dialkoxymagnesium and subjected to olefin polymerization. An object of the present invention is to provide a solid catalyst component for olefin polymerization and a catalyst which are components of an olefin polymerization catalyst capable of maintaining a high yield and obtaining a polymer having a small particle size and a uniform particle size distribution.
[0016]
[Means for Solving the Problems]
In this situation, as a result of intensive investigations, the present inventors have found that the fine powder produced when forming the solid catalyst component, and the fine powder polymer obtained by polymerizing olefins using the fine powder are dialkoxymagnesium as a raw material. In addition, the metal magnesium and alcohol are reacted, and then contacted with an alkoxytitanium compound in an inert organic solvent to form a suspension, and then the solvent in the suspension is removed. In this way, a dialkoxymagnesium is obtained, and a catalyst based on a solid catalyst component prepared by using the dialkoxymagnesium as a raw material maintains a high level of polymer activity and stereoregularity, and a polymer with extremely fine powder is obtained. As a result, the present invention has been completed.
[0017]
  That is, the method for producing dialkoxymagnesium according to the present invention for achieving the above object comprises metal magnesiumethanolAndOf iodine, diethoxymagnesium or magnesium chlorideReacting in the presence of a catalyst to obtain a solid, then with the solidC1-4 tetraWith alkoxy titanium compoundsDissolves the tetraalkoxytitanium compound having 1 to 4 carbon atoms and does not dissolve the solid matterContact in an inert organic solvent to form a suspension, after which the solvent in the suspension isBy decantation or filtrationThis is a method for producing dialkoxymagnesium to be removed.
[0018]
  Further, the solid catalyst component for olefin polymerization of the present invention comprises dialkoxymagnesium (a) produced by the above dialkoxymagnesium production method, a tetravalent titanium halogen compound (b),Methyl formate, ethyl acetate, vinyl acetate, propyl acetate, octyl acetate, cyclohexyl acetate, ethyl propionate, ethyl butyrate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, octyl benzoate, cyclohexyl benzoate, benzoate Acid phenyl, methyl p-toluate, ethyl p-toluate, methyl anisate, ethyl anisate, diethyl maleate, dibutyl maleate, diethyl diisopropyl malonate, dipropyl diisopropyl malonate, diisopropyl diisopropyl malonate, dibutyl diisopropyl malonate , Diisopropyl butyl malonate, dimethyl adipate, diethyl adipate, dipropyl adipate, dibutyl adipate, diisodecyl adipate, dioctyl adipate, aromatic dica It is selected from the Bonn acid diesterEsters orSelected from methyl ether, ethyl ether, propyl ether, butyl ether, amyl ether, diphenyl ether, 9,9-bis (methoxymethyl) fluorene, 2-isopropyl-2-isopentyl-1,3-dimethoxypropaneIt is a solid catalyst component for olefin polymerization prepared by contacting with ethers (c).
[0019]
  Furthermore, the catalyst for olefin polymerization of the present invention is the above-mentioned solid catalyst component (A),
(B) The following general formula (1); R¹ _pAlQ_3-p                      (1)
(Wherein R¹Represents an alkyl group having 1 to 4 carbon atoms, Q represents a hydrogen atom or a halogen atom, and p is a real number of 0 <p ≦ 3. ) Organoaluminum compounds represented by
(C)SaidEsters,SaidEthers orThe following general formula (2);
R ² _q Si (OR ³ ) _4-q (2)
(Wherein R ² Are alkyl groups having 1 to 12 carbon atoms, cycloalkyl groups, phenyl groups, vinyl groups, allyl groups, and aralkyl groups, which may be the same or different. R ³ Represents an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group, a phenyl group, a vinyl group, an allyl group, or an aralkyl group, which may be the same or different. q is an integer of 0 ≦ q ≦ 3. )An olefin polymerization catalyst containing an organosilicon compound.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
In the method for producing dialkoxymagnesium according to the present invention, first, a metal magnesium and an alcohol are reacted in the presence of a catalyst to obtain a dialkoxymagnesium solid.
[0022]
The metal magnesium used in the present invention is preferably, for example, tens to hundreds of meshes, and more specifically, powdery good reactivity of about 100 meshes. The alcohol is methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, etc., preferably ethanol. It is desirable to sufficiently remove the water in the alcohol before reacting with metal magnesium.
[0023]
Examples of the catalyst include alkyl halides such as methyl bromide, methyl chloride, ethyl bromide and ethyl chloride, metal halides such as magnesium chloride and aluminum chloride, dialkoxymagnesium such as diethoxymagnesium, iodine and acetic acid. Esters are used. Of these, iodine and diethoxymagnesium are particularly preferred.
[0024]
Metal magnesium and alcohol can be reacted by a known method, but as a preferred catalytic reaction method, the final addition ratio of metal magnesium and alcohol to the reaction system is metal magnesium / alcohol (weight ratio) = 1/9 to The final addition ratio of magnesium metal and alcohol was continuously or intermittently added to the reaction system under reflux of alcohol and allowed to react for 5 to 80 minutes, and then under reflux of alcohol. Holding for 1 to 30 hours, aging reaction is performed to obtain a solid.
[0025]
The solid material obtained as described above may be a suspension using the alcohol used in the above reaction as a solvent, or may be dried after removing the alcohol. Thereafter, the solid and the alkoxytitanium compound are contacted in an inert organic solvent to form a suspension, and then the solvent in the suspension is removed.
[0026]
As the alkoxytitanium compound used in the present invention, the general formula Ti (OR⁴)_rX_4-r(Where R⁴Represents an alkyl group having 1 to 4 carbon atoms, X represents a halogen atom such as a chlorine atom, a bromine atom or an iodine atom, and r is an integer of 1 to 4. And a compound selected from the group consisting of trialkoxytitanium halides, dialkoxytitanium dihalides, and alkoxytitanium trihalides.
[0027]
Specifically, tetraalkoxy titanium such as tetramethoxy titanium, tetraethoxy titanium, tetrapropoxy titanium, tetraisopropoxy titanium, tetrabutoxy titanium and tetraisobutoxy titanium, trimethoxy titanium chloride, triethoxy titanium chloride, tripropoxy titanium chloride , Trialkoxy halides such as tributoxy titanium chloride, dimethoxy titanium dichloride, diethoxy titanium dichloride, dipropoxy titanium dichloride, dialkoxy dihalides such as dibutoxy titanium dichloride, methoxy titanium trichloride, ethoxy titanium trichloride, propoxy titanium trichloride Examples thereof include alkoxy titanium trihalides such as butoxy titanium trichloride. Of these, tetraalkoxytitanium is preferable, and tetraethoxytitanium, tetrapropoxytitanium, tetraisopropoxytitanium, tetrabutoxytitanium, and most preferably tetraethoxytitanium.
[0028]
The inert organic solvent used for forming the suspension is one that dissolves the alkoxy titanium compound and does not dissolve the magnesium compound. Specifically, pentane, hexane, heptane, octane, nonane, decane, cyclohexane, etc. Saturated hydrocarbon compounds, aromatic hydrocarbon compounds such as benzene, toluene, xylene and ethylbenzene, halogenated hydrocarbon compounds such as methylene chloride and 1,2-dichlorobenzene, alcohols such as methanol, ethanol and isooctyl alcohol, And ethers such as diethyl ether. Of these, saturated hydrocarbon compounds such as hexane and heptane, and alcohols such as ethanol are preferably used.
[0029]
The conditions for contacting the solid and the alkoxytitanium compound in an inert organic solvent are such that the contact temperature is -20 to 150 ° C, preferably 0 to 130 ° C, particularly preferably 30 to 100 ° C, and the contact time is 1 minute. 10 hours, preferably 10 minutes to 5 hours, particularly preferably 30 minutes to 3 hours.
[0030]
The above-described alkoxytitanium compound, for example, tetraalkoxytitanium such as tetrabutoxytitanium, has a property of dissolving a solid substance that is dialkoxymagnesium. The dialkoxymagnesium production method of the present invention is made by utilizing the properties of the above-described alkoxytitanium compound, that is, a powdery form obtained by reacting metal magnesium with an alcohol in the presence of a catalyst. An alkoxytitanium compound is brought into contact with dialkoxymagnesium (solid matter). The fine powder and surface irregularities present on the surface of dialkoxymagnesium are considered to be the main cause of the fine powder polymer produced in olefin polymerization, and the surface of dialkoxymagnesium is removed when the solvent is removed by the contact. It is considered that a part is dissolved with an alkoxytitanium compound to remove the fine powder on the surface and the unevenness causing the fine powder.
[0031]
When forming the suspension by bringing the solid and the alkoxytitanium compound into contact with each other in the inert organic solvent, depending on the amount of the alkoxytitanium compound with respect to the solid, the solid is completely dissolved, and a uniform solution And the desired dialkoxymagnesium cannot be obtained. Therefore, in the method of the present invention, not all solids are dissolved, solids (solid magnesium compound) are left to form a suspension, and then the solvent is removed to obtain the remaining solids. Therefore, in the method of the present invention, the amount of the solid and the alkoxytitanium compound used when the solid and the alkoxytitanium compound are brought into contact with each other in the inert organic solvent is as follows. The titanium compound is 0.01 to 3 ml, preferably 0.05 to 1.5 ml, particularly preferably 0.10 to 1.0 ml, and most preferably 0.05 to 0.7 ml. The amount of the inert organic solvent is 0.5 to 100 ml, preferably 1 to 50 ml, with respect to 1 g of the solid. Particularly preferred is 3 to 30 ml.
[0032]
After forming the suspension as described above and treating the surface of the solid material, the solvent in the suspension is removed by decantation, filtration, etc., and washed with an inert organic solvent. Alkoxy magnesium is obtained. Here, as described above, the solid substance which is dialkoxymagnesium reacts with the alkoxytitanium compound to form a magnesium and titanium compound, and a part thereof is dissolved in the solvent. It is preferable to remove the solvent in the dialkoxymagnesium as much as possible so as to obtain a polymer with less fine powder. However, it is inevitable that the dialkoxymagnesium of the present invention is mixed with impurities such as a trace amount of an alkoxytitanium compound. Therefore, the titanium content in the dialkoxymagnesium of the present invention is 0.01 to 1% by weight, preferably 0.05 to 0.5% by weight, particularly preferably 0.1 to 0.5% by weight.
[0033]
In the dialkoxymagnesium production method of the present invention, dialkoxymagnesium is prepared by dissolving a part of the dialkoxymagnesium surface. The solid catalyst component for olefin polymerization prepared using the dialkoxymagnesium The olefin polymerization catalyst according to the method makes it possible to keep the production of a fine polymer extremely low while maintaining the original catalyst performance.
[0034]
The dialkoxymagnesium (a) obtained as described above is contacted with the titanium compound (b) and the electron donating compound (c) to prepare a solid catalyst component. At this time, the dialkoxymagnesium is used as it is in the suspension with the inert organic solvent used in the preparation thereof, or separated and dried as necessary for the subsequent steps. Considering the simplification of the manufacturing process, it is desirable to use the suspension as it is without separation and drying. However, when an inert organic solvent such as alcohol or ether that reacts with the titanium compound (b) is used, it is desirable to sufficiently remove dialkoxymagnesium by drying under vacuum or heating.
[0035]
The dialkoxymagnesium obtained as described above is in the form of granules or powder, and its shape is indefinite or spherical. Among these, spherical dialkoxymagnesium, when used as a raw material for the solid catalyst component, gives a polymer powder having a better particle shape and narrow particle size distribution, and the handling operability of the resulting polymer powder during the polymerization operation is improved. And the problems such as clogging caused by the fine powder contained in the produced polymer powder are solved.
[0036]
Spherical dialkoxymagnesium does not necessarily have to be a spherical shape, and an elliptical or potato-shaped one can also be used. Specifically, the particle shape is such that the ratio (l / w) of the major axis diameter l to the minor axis diameter w is 3 or less, preferably 1 to 2, more preferably 1 to 1.5. .
[0037]
Moreover, the average particle diameter of dialkoxymagnesium of the present invention can be 1 to 200 μm. Preferably it is 5 to 150 μm. In the case of spherical dialkoxymagnesium, the average particle diameter is 1 to 100 μm, preferably 5 to 50 μm, and more preferably 10 to 40 μm. As for the particle size, it is desirable to use one having a small particle size distribution and a small amount of fine powder and coarse powder. Specifically, the particle size of 5 μm or less is 20% or less, preferably 10% or less. On the other hand, the particle size of 100 μm or more is 10% or less, preferably 5% or less. Further, when the particle size distribution is expressed by ln (D90 / D10) (where D90 is the cumulative particle size and the particle size at 90%, D10 is the cumulative particle size and the particle size at 10%), it is preferably 3 or less, preferably 2 or less.
[0038]
The specific surface area of the dialkoxymagnesium of the present invention is 10 to 100 m.²/ G, preferably 20-80m²/ G, particularly preferably 25-50 m²/ G. Furthermore, the specific surface area of dialkoxymagnesium of the present invention is characterized in that it is larger than the specific surface area of the solid before treatment with the alkoxytitanium compound obtained by reacting metal magnesium and alcohol. Increase by 5 to 50%, preferably 10 to 30% of the specific surface area.
[0039]
The tetravalent titanium halogen compound (b) used for the preparation of the solid catalyst component (A) in the present invention has the general formula Ti (OR⁵)_nY_4-n(Wherein R⁵Represents an alkyl group having 1 to 4 carbon atoms, Y represents a halogen atom such as a chlorine atom, bromine atom or iodine atom, and n is an integer of 0 or 1 to 3. Or a compound selected from the group consisting of titanium halides and alkoxytitanium halides.
[0040]
Specifically, titanium tetrachloride such as titanium tetrachloride, titanium tetrabromide and titanium tetraiodide as titanium halide, methoxytitanium trichloride, ethoxytitanium trichloride, propoxytitanium trichloride, n-butoxytitanium trichloride as alkoxytitanium halide. Examples include chloride, dimethoxy titanium dichloride, diethoxy titanium dichloride, dipropoxy titanium dichloride, di-n-butoxy titanium dichloride, trimethoxy titanium chloride, triethoxy titanium chloride, tripropoxy titanium chloride, tri-n-butoxy titanium chloride. The Of these, titanium tetrahalide is preferable, and titanium tetrachloride is particularly preferable. These titanium compounds can be used alone or in combination of two or more.
[0041]
The electron-donating compound (hereinafter sometimes simply referred to as component (c)) used in the preparation of the solid catalyst component (A) in the present invention is an organic compound containing an oxygen atom or a nitrogen atom, such as alcohols. Phenols, ethers, esters, ketones, acid halides, aldehydes, amines, amides, nitriles, isocyanates, organosilicon compounds containing a Si—O—C bond, and the like.
[0042]
Specifically, alcohols such as methanol, ethanol, n-propanol and 2-ethylhexanol, phenols such as phenol and cresol, methyl ether, ethyl ether, propyl ether, butyl ether, amyl ether, diphenyl ether, 9,9- Ethers such as bis (methoxymethyl) fluorene and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, methyl formate, ethyl acetate, vinyl acetate, propyl acetate, octyl acetate, cyclohexyl acetate, ethyl propionate, ethyl butyrate , Methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, octyl benzoate, cyclohexyl benzoate, phenyl benzoate, methyl p-toluate, ethyl p-toluate, methyl anisate, anisic acid Monocarboxylic acid esters such as chill, diethyl maleate, dibutyl maleate, diethyl diisopropylmalonate, dipropylmalonate dipropyl, diisopropylmalonate diisopropyl, diisopropylmalonate dibutyl, diisopropylmalonate diisobutyl, adipate dimethyl, adipate diethyl, Dicarboxylates such as dipropyl adipate, dibutyl adipate, diisodecyl adipate, dioctyl adipate, phthalate diester, ketones such as acetone, methyl ethyl ketone, methyl butyl ketone, acetophenone, benzophenone, phthalate dichloride, terephthalate dichloride, etc. Aldehydes such as acid halides, acetaldehyde, propionaldehyde, octylaldehyde, benzaldehyde, etc. Amines such as methylamine, ethylamine, tributylamine, piperidine, aniline, pyridine, amides such as oleic acid amide, stearic acid amide, nitriles such as acetonitrile, benzonitrile, tolunitrile, methyl isocyanate, isocyanate Mention may be made of isocyanates such as ethyl, organosilicon compounds containing Si—O—C bonds such as phenylalkoxysilane, alkylalkoxysilane, phenylalkylalkoxysilane, cycloalkylalkoxysilane, cycloalkylalkylalkoxysilane and the like.
[0043]
Among the above electron donating compounds, esters, particularly aromatic dicarboxylic acid diesters are preferably used, and phthalic acid diesters and derivatives thereof are particularly preferable in terms of improving hydrogen activity during polymerization. Among these, specific examples of phthalic acid diesters include dimethyl phthalate, diethyl phthalate, di-n-propyl phthalate, di-iso-propyl phthalate, di-n-butyl phthalate, di-iso-phthalate. Butyl, ethyl methyl phthalate, methyl phthalate (iso-propyl), ethyl phthalate (n-propyl), ethyl phthalate (n-butyl), ethyl phthalate (iso-butyl), di-n-pentyl phthalate Di-iso-pentyl phthalate, di-neo-pentyl phthalate, dihexyl phthalate, di-n-heptyl phthalate, di-n-octyl phthalate, bis (2,2-dimethylhexyl) phthalate, phthalate Bis (2-ethylhexyl) acid, di-n-nonyl phthalate, di-iso-decyl phthalate, bis (2,2-dimethylheptyl phthalate) ), N-butyl phthalate (iso-hexyl), n-butyl phthalate (2-ethylhexyl), n-pentylhexyl phthalate, n-pentyl phthalate (iso-hexyl), iso-pentyl phthalate (heptyl) ), N-pentyl (2-ethylhexyl) phthalate, n-pentyl phthalate (iso-nonyl), iso-pentyl phthalate (n-decyl), n-pentylundecyl phthalate, iso-pentyl phthalate (iso) -Hexyl), n-hexyl phthalate (2,2-dimethylhexyl), n-hexyl phthalate (2-ethylhexyl), n-hexyl phthalate (iso-nonyl), n-hexyl phthalate (n-decyl) N-heptyl phthalate (2-ethylhexyl), n-heptyl phthalate (iso-nonyl), n-phthalate Heptyl (neo-decyl) are exemplified phthalate 2-ethylhexyl (an iso-nonyl) is, these one or more kinds are used.
[0044]
Moreover, as a phthalic-acid diester derivative, following General formula (3);
(R⁶)_lC₆H₄(COOR⁷) (COOR⁸(3)
(Wherein R⁶Represents an alkyl group having 1 to 8 carbon atoms or a halogen atom, and R⁷And R⁸Represents an alkyl group having 1 to 12 carbon atoms, and R⁷And R⁸May be the same or different and the substituent R⁶The number l of 1 is 1 or 2, and when l is 2, R⁶May be the same or different. ) Is preferred.
[0045]
In the general formula (3), R⁶Specific examples in the case where is an alkyl group having 1 to 8 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, n-pentyl group, Isopentyl group, neopentyl group, n-hexyl group, isohexyl group, 2,2-dimethylbutyl group, 2,2-dimethylpentyl group, isooctyl group, 2,2-dimethylhexyl group, R⁶Specific examples of when is a halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R⁶Is preferably a methyl group, a bromine atom or a fluorine atom, more preferably a methyl group or a bromine atom. In addition, the substituent R⁶The number l of 1 is 1 or 2, and when l is 2, R⁶May be the same or different. When l is 1, R⁶Is substituted with a hydrogen atom at the 3-position, 4-position or 5-position of the phthalate derivative of the above general formula (3), and when l is 2,⁶Is preferably substituted with hydrogen atoms at positions 4 and 5.
[0046]
In the general formula (3), R⁷And R⁸As methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, n-pentyl group, isopentyl group, neopentyl group, n-hexyl group, isohexyl group, 2 , 2-dimethylbutyl group, 2,2-dimethylpentyl group, or isooctyl group, 2,2-dimethylhexyl group, n-nonyl group, isononyl group, n-decyl group, isodecyl group, and n-dodecyl group. Among these, an ethyl group, an n-butyl group, an isobutyl group, a t-butyl group, a neopentyl group, an isohexyl group, and an isooctyl group are preferable, and an ethyl group, an n-butyl group, and a neopentyl group are particularly preferable.
[0047]
Examples of the phthalic acid diester derivative represented by the general formula (3) include diethyl 4-methylphthalate, di-n-butyl 4-methylphthalate, diisobutyl 4-methylphthalate, dineopentyl 4-bromophthalate, and diethyl 4-bromophthalate. , 4-bromophthalate di-n-butyl, 4-bromophthalate diisobutyl, 4-methylphthalate dineopentyl, 4,5-dimethylphthalate dineopentyl, 4-methylphthalate dineopentyl, 4-ethylphthalate dineopentyl, 4-methylphthalate-t -Butyl neopentyl, 4-ethyl phthalate-t-butyl neopentyl, 4,5-dimethylphthalate dineopentyl, 4,5-diethyl phthalate dineopentyl, 4,5-dimethyl phthalate-t-butyl neopentyl, 4, 5-diethylphthalic acid t- butyl neopentyl, 3-fluoro-phthalic acid dineopentyl, 3-chlorophthalic acid dineopentyl, 4-chlorophthalic acid dineopentyl, 4-bromophthalic acid dineopentyl, and the like, alone or in combination of two or more of these can be used.
[0048]
The above esters are preferably used in combination of two or more, and the esters are used so that the total carbon number of the alkyl group of the ester used is 4 or more compared to that of other esters. It is desirable to combine.
[0049]
In the present invention, the above components (a), (b) and (c) are substituted with an aromatic hydrocarbon compound (d) having a boiling point of 50 to 150 ° C. (hereinafter sometimes simply referred to as “component (d)”). The method of preparing the component (A) by contacting in the presence of is a preferred embodiment of the preparation method. As the aromatic hydrocarbon compound (d) having a boiling point of 50 to 150 ° C., toluene, xylene, and ethylbenzene are used. Preferably used. Moreover, these may be used independently or may be used in mixture of 2 or more types. When a saturated hydrocarbon compound other than an aromatic hydrocarbon compound having a boiling point of 50 to 150 ° C. is used, the solubility of impurities decreases during the reaction or washing, resulting in the catalytic activity of the resulting solid catalyst component and the resulting polymer It is not preferable in that the stereoregularity of is lowered.
[0050]
In addition to the component (a), (b), (c) or (d), polysiloxane can also be used during the preparation of the solid catalyst component (A). Polysiloxane is a polymer having a siloxane bond (—Si—O— bond) in the main chain, but is also collectively referred to as silicone oil, and has a viscosity at 25 ° C. of 0.02 to 100 cm.²/ s (2 to 10000 centistokes), more preferably 0.03 to 5 cm²It is a linear, partially hydrogenated, cyclic or modified polysiloxane that is liquid or viscous at room temperature and has / s (3 to 500 centistokes).
[0051]
As the chain polysiloxane, hexamethyldisiloxane, hexaethyldisiloxane, hexapropyldisiloxane, hexaphenyldisiloxane 1,3-divinyltetramethyldisiloxane, 1,3-dichlorotetramethyldisiloxane, 1, , 3-dibromotetramethyldisiloxane, chloromethylpentamethyldisiloxane, 1,3-bis (chloromethyl) tetramethyldisiloxane, and dimethylpolysiloxane and methylphenylpolysiloxane as polysiloxanes other than disiloxane are partially hydrogenated As hydrogenated polysiloxane, methyl hydrogen polysiloxane having a hydrogenation rate of 10 to 80% is used. As cyclic polysiloxane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamera is used. Rucyclopentasiloxane, 2,4,6-trimethylcyclotrisiloxane, 2,4,6,8-tetramethylcyclotetrasiloxane, and modified polysiloxanes include higher fatty acid group-substituted dimethylsiloxane and epoxy group-substituted dimethylsiloxane. And polyoxyalkylene group-substituted dimethylsiloxane. Among these, decamethylcyclopentasiloxane and dimethylpolysiloxane are preferable, and decamethylcyclopentasiloxane is particularly preferable.
[0052]
Below, the preparation method of the component (A) of this invention is described. Specifically, the solid (a) is suspended in the aromatic hydrocarbon compound (d), and the tetravalent titanium halogen compound (b) and the electron donating compound (c) are contacted to obtain a solid component. The contact of each component is performed with stirring in a container equipped with a stirrer in an inert gas atmosphere and in a state where moisture and the like are removed. The contact temperature is a temperature at the time of contact of each component, and may be the same temperature as the reaction temperature or a different temperature. The contact temperature may be a relatively low temperature range around room temperature when the mixture is simply brought into contact with stirring and mixed, or dispersed or suspended for modification, but the product is allowed to react after contact. When obtaining, the temperature range of 40-130 degreeC is preferable. If the temperature during the reaction is less than 40 ° C., the reaction does not proceed sufficiently, resulting in insufficient performance of the prepared solid component, and if it exceeds 130 ° C., the evaporation of the solvent used becomes remarkable. , It becomes difficult to control the reaction. The reaction time is 1 minute or longer, preferably 10 minutes or longer, more preferably 30 minutes or longer.
[0053]
Below, the contact order at the time of preparing the solid catalyst component (A) of this invention is illustrated more concretely.
(1) (a) → (d) → (b) → (c) → << intermediate washing → (d) → (b) >> → final washing → solid catalyst component (A)
(2) (a) → (d) → (c) → (b) → << intermediate washing → (d) → (b) >> → final washing → solid catalyst component (A)
(3) (a) → (d) → (b) → (c) → << intermediate washing → (d) → (b) → (c) >> → final washing → solid catalyst component (A)
(4) (a) → (d) → (b) → (c) → << intermediate washing → (d) → (c) → (b) >> → final washing → solid catalyst component (A)
(5) (a) → (d) → (c) → (b) << intermediate washing → (d) → (b) → (c) >> → final washing → solid catalyst component (A)
(6) (a) → (d) → (c) → (b) → << intermediate washing → (d) → (c) → (b) >> → final washing → solid catalyst component (A)
(7) (a) → (d) → (b) → (c) → << intermediate washing → (d) → (b) >> → final washing → solid catalyst component (A)
(8) (a) → (d) → (b) → (c) → << intermediate washing → (d) → (b) + (c) >> → final washing → solid catalyst component (A)
(9) (a) → (d) → (b) → (c) → << intermediate washing → (d) → (b) >> → final washing → solid catalyst component (A)
(10) (a) → (d) → (b) → (c) → << intermediate washing → (d) → (b) + (c) >> → final washing → solid catalyst component (A)
(11) (a) → (b) + (d) → (c) → << intermediate washing → (b) + (d) >> → final washing → solid catalyst component (A)
(12) (a) → (b) + (d) → (c) → << intermediate washing → (d) → (b) >> → final washing → solid catalyst component (A)
[0054]
In each of the contact methods described above, the activity in the parentheses (<<) is further improved by repeating the process a plurality of times as necessary. In addition, the component (b) or component (c) used in the steps in <<> may be newly added or may be the residue of the previous step. In addition to the washing steps shown in (1) to (12) above, the product obtained in each contact stage can be washed with a hydrocarbon compound that is liquid at room temperature.
[0055]
Based on the above, as a preferable method for preparing the solid catalyst component (A) in the present application, spherical dialkoxymagnesium and tetraethoxysilane are contacted in heptane at room temperature to form a suspension. Thereafter, the solvent is removed to obtain a solid (a). The solid (a) is suspended in an aromatic hydrocarbon compound (d) having a boiling point of 50 to 150 ° C., and then the tetravalent titanium halogen compound (b) is brought into contact with the suspension, followed by reaction treatment. Do. At this time, before or after the tetravalent titanium halogen compound (b) is brought into contact with the suspension, one or more electron donating compounds (c) are brought into contact at -20 to 130 ° C. To obtain a solid reaction product (1). At this time, it is desirable to carry out the aging reaction at a low temperature before or after contacting the electron donating compound (c). After washing this solid reaction product (1) with a liquid hydrocarbon compound at room temperature (intermediate washing), tetravalent titanium halogen compound (b) is again added in the presence of an aromatic hydrocarbon compound in the range of −20 to 20 The contact treatment is performed at 100 ° C. to obtain a solid reaction product (2). If necessary, the intermediate cleaning and reaction treatment may be repeated a plurality of times. Next, the solid reaction product (2) is washed with a hydrocarbon compound that is liquid at room temperature (final washing) to obtain a solid catalyst component (A).
[0056]
As a particularly preferred method for preparing the solid catalyst component (A) in the present application, a suspension is formed from dialkoxymagnesium, the component (c) and the aromatic hydrocarbon compound (d) having a boiling point of 50 to 150 ° C. The preparation method by making the mixed solution formed from b) and component (d) contact this suspension, and making it react after that can be mentioned.
[0057]
The most preferable method for preparing the solid catalyst component (A) in the present application includes the following methods. A suspension is formed from the dialkoxymagnesium (a), the component (c), and the aromatic hydrocarbon compound (d) having a boiling point of 50 to 150 ° C. A mixed solution is formed from the component (b) and the aromatic hydrocarbon compound (d) having a boiling point of 50 to 150 ° C., and the suspension is added to the mixed solution. Then, the obtained mixed solution is heated and subjected to a reaction process (first reaction process). After completion of the reaction, the obtained solid product is washed with a liquid hydrocarbon compound at room temperature (intermediate washing), and then a component (b) and an aromatic hydrocarbon compound (d) having a boiling point of 50 to 150 ° C. are newly added. It is made to contact at -20-100 degreeC, and it heats up, and performs a reaction process (secondary reaction process). After completion of the reaction, the solid catalyst component is obtained by washing (final washing) with a liquid hydrocarbon compound at room temperature.
[0058]
Preferred conditions for the above treatment or washing are as follows.
Low temperature aging reaction: −20 to 70 ° C., preferably −10 to 60 ° C., more preferably 0 to 30 ° C., 1 minute to 6 hours, preferably 5 minutes to 4 hours, particularly preferably 10 minutes to 3 hours. .
Reaction treatment: 0 to 130 ° C., preferably 40 to 120 ° C., particularly preferably 50 to 115 ° C., 0.5 to 6 hours, preferably 0.5 to 5 hours, particularly preferably 1 to 4 hours.
Washing: 0 to 110 ° C., preferably 30 to 100 ° C., particularly preferably 30 to 90 ° C., 1 to 20 times, preferably 1 to 15 times, particularly preferably 1 to 10 times.
[0059]
The hydrocarbon compound used for washing is preferably an aromatic hydrocarbon compound or a saturated hydrocarbon compound that is liquid at room temperature. Specifically, the aromatic hydrocarbon compound may be a saturated hydrocarbon such as toluene, xylene, or ethylbenzene. Examples of the compound include hexane, heptane, cyclohexane and the like. Preferably, an aromatic hydrocarbon compound is used in the intermediate cleaning, and a saturated hydrocarbon compound is used in the final cleaning.
[0060]
The amount ratio of each component used in preparing the solid catalyst component (A) varies depending on the preparation method and cannot be specified unconditionally. For example, the tetravalent titanium halogen compound (b) is 0.1 per mol of the magnesium compound. 5 to 100 mol, preferably 0.5 to 50 mol, more preferably 1 to 10 mol, the electron donating compound (c) is 0.01 to 10 mol, and the aromatic hydrocarbon compound (d) is 0.00. It is 001-500 mol, Preferably it is 0.001-100 mol, More preferably, it is 0.005-10 mol.
[0061]
Further, the content of titanium, magnesium, halogen atom and electron donating compound in the solid catalyst component (A) in the present invention is not particularly defined, but preferably 1.8 to 8.0% by weight, preferably 2% of titanium. 0.0-8.0 wt%, more preferably 3.0-8.0 wt%, magnesium 10-70 wt%, more preferably 10-50 wt%, particularly preferably 15-40 wt%, still more preferably Is 15 to 25% by weight, halogen atom is 20 to 90% by weight, more preferably 30 to 85% by weight, particularly preferably 40 to 80% by weight, still more preferably 45 to 75% by weight, and the electron donating compound (c ) Is 0.5 to 30 wt% in total, more preferably 1 to 25 wt% in total, and particularly preferably 2 to 20 wt% in total. In order to bring out the overall performance of the solid catalyst component (A) using the electron donating compound of the present invention and other components in a more balanced manner, the titanium content is 3 to 8% by weight and the magnesium content is 15 to 15%. It is desirable that the content of the halogen atom is 25 wt%, the halogen atom content is 45 to 75 wt%, and the content of the electron donating compound (c) is 2 to 20 wt%.
[0062]
As the organoaluminum compound (B) used in forming the olefin polymerization catalyst of the present invention, a compound represented by the above general formula (1) can be used. Specific examples of such an organoaluminum compound (B) include triethylaluminum, diethylaluminum chloride, tri-iso-butylaluminum, diethylaluminum bromide and diethylaluminum hydride, and one or more can be used. Triethylaluminum and tri-iso-butylaluminum are preferable.
[0063]
The external electron donating compound (C) (hereinafter sometimes referred to as “component (C)”) used in forming the olefin polymerization catalyst of the present invention is used for the preparation of the solid catalyst component described above. The same electron donating compounds that can be used are used, among which ethers such as 9,9-bis (methoxymethyl) fluorene, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, methyl benzoate and Esters such as ethyl benzoate and organosilicon compounds.
[0064]
As said organosilicon compound, the compound represented by the said General formula (2) is used. Examples of such an organosilicon compound include phenylalkoxysilane, alkylalkoxysilane, phenylalkylalkoxysilane, cycloalkylalkoxysilane, and cycloalkylalkylalkoxysilane.
[0065]
Specific examples of the organosilicon compounds include trimethylmethoxysilane, trimethylethoxysilane, tri-n-propylmethoxysilane, tri-n-propylethoxysilane, tri-n-butylmethoxysilane, tri-iso-butylmethoxy. Silane, tri-t-butylmethoxysilane, tri-n-butylethoxysilane, tricyclohexylmethoxysilane, tricyclohexylethoxysilane, cyclohexyldimethylmethoxysilane, cyclohexyldiethylmethoxysilane, cyclohexyldiethylethoxysilane, dimethyldimethoxysilane, dimethyldiethoxy Silane, di-n-propyldimethoxysilane, di-iso-propyldimethoxysilane, di-n-propyldiethoxysilane, di-iso-propyldiethoxy Orchid, di-n-butyldimethoxysilane, di-iso-butyldimethoxysilane, di-t-butyldimethoxysilane, di-n-butyldiethoxysilane, n-butylmethyldimethoxysilane, bis (2-ethylhexyl) dimethoxysilane Bis (2-ethylhexyl) diethoxysilane, dicyclopentyldimethoxysilane, dicyclopentyldiethoxysilane, dicyclohexyldimethoxysilane, dicyclohexyldiethoxysilane, bis (3-methylcyclohexyl) dimethoxysilane, bis (4-methylcyclohexyl) dimethoxysilane Bis (3,5-dimethylcyclohexyl) dimethoxysilane, cyclohexylcyclopentyldimethoxysilane, cyclohexylcyclopentyldiethoxysilane, cyclohexylcyclopenty Dipropoxysilane, 3-methylcyclohexylcyclopentyldimethoxysilane, 4-methylcyclohexylcyclopentyldimethoxysilane, 3,5-dimethylcyclohexylcyclopentyldimethoxysilane, 3-methylcyclohexylcyclohexyldimethoxysilane, 4-methylcyclohexylcyclohexyldimethoxysilane, 3,5- Dimethylcyclohexylcyclohexyldimethoxysilane, cyclopentylmethyldimethoxysilane, cyclopentylmethyldiethoxysilane, cyclopentylethyldiethoxysilane, cyclopentyl (iso-propyl) dimethoxysilane, cyclopentyl (iso-butyl) dimethoxysilane, cyclohexylmethyldimethoxysilane, cyclohexylmethyldiethoxy Silane, cyclohexyl Tildimethoxysilane, cyclohexylethyldiethoxysilane, cyclohexyl (n-propyl) dimethoxysilane, cyclohexyl (iso-propyl) dimethoxysilane, cyclohexyl (n-propyl) diethoxysilane, cyclohexyl (iso-butyl) dimethoxysilane, cyclohexyl (n -Butyl) diethoxysilane, cyclohexyl (n-pentyl) dimethoxysilane, cyclohexyl (n-pentyl) diethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, phenylethyldimethoxysilane , Phenylethyldiethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyl Rutriethoxysilane, n-propyltrimethoxysilane, iso-propyltrimethoxysilane, n-propyltriethoxysilane, iso-propyltriethoxysilane, n-butyltrimethoxysilane, iso-butyltrimethoxysilane, t-butyltri Methoxysilane, n-butyltriethoxysilane, 2-ethylhexyltrimethoxysilane, 2-ethylhexyltriethoxysilane, cyclopentyltrimethoxysilane, cyclopentyltriethoxysilane, cyclohexyltrimethoxysilane, cyclohexyltriethoxysilane, vinyltrimethoxysilane, vinyl Triethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, te A tributoxysilane etc. can be mentioned. Among the above, di-n-propyldimethoxysilane, di-iso-propyldimethoxysilane, di-n-butyldimethoxysilane, di-iso-butyldimethoxysilane, di-t-butyldimethoxysilane, di-n-butyldi Ethoxysilane, t-butyltrimethoxysilane, dicyclohexyldimethoxysilane, dicyclohexyldiethoxysilane, cyclohexylmethyldimethoxysilane, cyclohexylmethyldiethoxysilane, cyclohexylethyldimethoxysilane, cyclohexylethyldiethoxysilane, dicyclopentyldimethoxysilane, dicyclopentyldiethoxy Silane, cyclopentylmethyldimethoxysilane, cyclopentylmethyldiethoxysilane, cyclopentylethyldiethoxysilane, cyclohexylsilane Lopentyldimethoxysilane, cyclohexylcyclopentyldiethoxysilane, 3-methylcyclohexylcyclopentyldimethoxysilane, 4-methylcyclohexylcyclopentyldimethoxysilane, 3,5-dimethylcyclohexylcyclopentyldimethoxysilane are preferably used, and the organosilicon compound (C) is 1 It can be used in combination of two or more species.
[0066]
Next, the catalyst for olefin polymerization of the present invention contains the above-described solid catalyst component (A), component (B), and component (C) for olefin polymerization, and polymerization of olefins in the presence of the catalyst. Copolymerization is performed. Examples of olefins include ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, and vinylcyclohexane. These olefins can be used alone or in combination of two or more. In particular, ethylene, propylene and 1-butene are preferably used. Particularly preferred is propylene. In the case of polymerization of propylene, copolymerization with other olefins can also be performed. Examples of olefins to be copolymerized include ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, vinylcyclohexane, and the like, and these olefins can be used alone or in combination of two or more. In particular, ethylene and 1-butene are preferably used.
[0067]
The amount of each component used is arbitrary as long as it does not affect the effect of the present invention, and is not particularly limited. Usually, the organoaluminum compound (B) is titanium in the solid catalyst component (A). It is used in the range of 1 to 2000 mol, preferably 50 to 1000 mol, per mol of atoms. The organosilicon compound (C) is used in an amount of 0.002 to 10 mol, preferably 0.01 to 2 mol, particularly preferably 0.01 to 0.5 mol, per 1 mol of the component (B).
[0068]
The order of contact of each component is arbitrary, but the organoaluminum compound (B) is first charged into the polymerization system, then the organosilicon compound (C) is contacted, and the solid catalyst component (A) for olefin polymerization is further added. It is desirable to contact.
[0069]
The polymerization method in the present invention can be carried out in the presence or absence of an organic solvent, and the olefin monomer such as propylene can be used in any state of gas and liquid. The polymerization temperature is 200 ° C. or lower, preferably 100 ° C. or lower, and the polymerization pressure is 10 MPa or lower, preferably 5 MPa or lower. Moreover, any of a continuous polymerization method and a batch type polymerization method is possible. Furthermore, the polymerization reaction may be performed in one stage or in two or more stages.
[0070]
Further, in the present invention, when polymerizing an olefin using a catalyst containing the solid catalyst component (A), the component (B), and the component (C) for olefin polymerization (also referred to as main polymerization), the catalytic activity and the steric properties are determined. In order to further improve the regularity and the particle properties of the polymer to be produced, it is desirable to perform prepolymerization prior to the main polymerization. In the prepolymerization, the same olefins as in the main polymerization or monomers such as styrene can be used.
[0071]
In carrying out the prepolymerization, the order of contacting the respective components and monomers is arbitrary, but preferably, the component (B) is first charged into the prepolymerization system set to an inert gas atmosphere or an olefin gas atmosphere, and then the olefin. After contacting the solid catalyst component (A) for homopolymerization, an olefin such as propylene and / or one or more other olefins are contacted. When the prepolymerization is performed by combining the component (C), the component (B) is first charged into the prepolymerization system set to an inert gas atmosphere or an olefin gas atmosphere, and then the component (C) is contacted. A method of contacting an olefin such as propylene and / or one or other two or more olefins after contacting the solid catalyst component (A) for olefin polymerization is desirable.
[0072]
When olefins are polymerized in the presence of an olefin polymerization catalyst formed according to the present invention, the resulting polymer has very little fines and a uniform particle size distribution compared to the case where a conventional catalyst is used. And high degree of stereoregularity and yield of the polymer can be maintained. The catalyst for olefin polymerization of the present invention is very advantageous particularly for a polyolefin production process by a gas phase method.
[0073]
【Example】
Hereinafter, examples of the present invention will be described in detail while comparing with comparative examples.
Example 1
(Preparation of diethoxymagnesium)
Suspension charged with 5 g of metal magnesium fine powder with a particle size of 100 mesh or less, 125 ml of ethanol at room temperature, and 3 g of iodine in a 2-liter round bottom flask fully substituted with nitrogen gas and equipped with a stirrer and reflux condenser. Formed. The suspension was then warmed with stirring to initiate the reaction under ethanol reflux. After starting the reaction, 5 g of metal magnesium powder having a particle size of 100 mesh or less and 62 ml of ethanol were simultaneously added to the flask four times over 30 minutes. After completion of the addition, the mixture was maintained for 10 hours with stirring under reflux of ethanol. (The final added magnesium is 25 g, and ethanol is 373 ml (about 294.3 g), and final added magnesium metal / ethanol = 1 / 11.8). Then, after cooling to room temperature, the supernatant was decanted and vacuum dried to obtain about 100 g of a spherical solid. An SEM photograph of this solid is shown in FIG. Moreover, when the specific surface area of a solid substance was measured by BET, it was 28.3m.²/ G. Furthermore, when the particle size distribution was measured, 11 μm or less was 8.2% by weight.
[0074]
Next, 10 g of the solid material obtained above and 60 ml of n-heptane at room temperature were added to a 500 ml round bottom flask which had been sufficiently replaced with nitrogen gas and equipped with a stirrer and stirred, and then 1.25 ml of tetraethoxytitanium was added. Inserted and stirred to form a suspension. Then, it is allowed to stand, and the supernatant liquid is removed by decantation. Further, 100 ml of n-heptane at room temperature is added and stirred, and this operation is repeated 5 times to obtain a suspension of the diethoxymagnesium composition and n-heptane. Prepared. An SEM photograph of this diethoxymagnesium is shown in FIG. Moreover, when the specific surface area of a solid substance was measured by BET, it was 32.3m.²/ G. Further, when the titanium content in diethoxymagnesium was measured, it was 0.16% by weight, and when the particle size distribution was measured, 11 μm or less was 7.2% by weight.
[0075]
[Preparation of solid catalyst component (A)]
The supernatant of the diethoxymagnesium suspension was removed, and 50 ml of toluene and 2.4 ml of di-n-butyl phthalate were added to form a suspension. On the other hand, 30 ml of titanium tetrachloride and 20 ml of toluene are charged into a 500 ml round bottom flask which is sufficiently replaced with nitrogen gas and equipped with a stirrer to form a mixed solution, and the above suspension is suspended in this mixed solution. The liquid was added. Thereafter, the mixed solution was heated and reacted at 90 ° C. with stirring for 2 hours. After completion of the reaction, the obtained solid product was washed 4 times with 100 ml of toluene at 90 ° C., 30 ml of titanium tetrachloride and 70 ml of toluene were newly added, the temperature was raised to 112 ° C., and the mixture was reacted for 2 hours with stirring. After completion of the reaction, the solid catalyst component was obtained by washing 10 times with 100 ml of n-heptane at 40 ° C. In addition, it was 4.1 weight% when the titanium content rate in this solid catalyst component was measured.
[0076]
[Formation and polymerization of polymerization catalyst]
Into an autoclave with a stirrer having an internal volume of 2.0 liters completely substituted with nitrogen gas, 1.32 mmol of triethylaluminum, 0.13 mmol of cyclohexylmethyldimethoxysilane and 0.0026 mmol of the above solid catalyst component as titanium atoms were charged. A polymerization catalyst was formed. Thereafter, 2.0 liters of hydrogen gas and 1.4 liters of liquefied propylene were charged, preliminarily polymerized at 20 ° C. for 5 minutes, then heated up, and polymerized at 70 ° C. for 1 hour. Polymerization activity per 1 g of the solid catalyst component at this time, the ratio of boiling n-heptane insoluble matter in the produced polymer (HI), the melt flow rate value (MFR) of the produced polymer (a), fine powder of the produced polymer Table 1 shows (212 μm or less) and particle size distribution [(D90-D10) / D50].
[0077]
The polymerization activity per solid catalyst component used here was calculated by the following equation.
Polymerization activity = produced polymer (g) / solid catalyst component (g)
Further, the ratio (HI) of boiling n-heptane insoluble matter in the produced polymer is the ratio (% by weight) of the polymer insoluble in n-heptane when this produced polymer is extracted with boiling n-heptane for 6 hours. ).
Further, the melt flow rate value (MFR) of the produced polymer (a) was measured according to ASTM D 1238 and JIS K 7210.
[0078]
Example 2
A solid component was prepared in the same manner as in Example 1 except that tetrabutoxytitanium was changed to 1.5 ml instead of 1.25 ml of tetraethoxytitanium, and a polymerization catalyst was formed and polymerized. As a result, the titanium content in the obtained solid catalyst component was 4.3% by weight. The polymerization results are shown in Table 1.
[0079]
Comparative Example 1
10 g of the solid material obtained in Example 1 (no operation after treatment with tetraethoxytitanium), 50 ml of toluene and diphthalic acid distillate in a 500 ml round bottom flask fully substituted with nitrogen gas and equipped with a stirrer -2.4 ml of n-butyl was added to form a suspension. On the other hand, 30 ml of titanium tetrachloride and 20 ml of toluene are charged into a 500 ml round bottom flask which is sufficiently replaced with nitrogen gas and equipped with a stirrer to form a mixed solution, and the above suspension is suspended in this mixed solution. The liquid was added. Thereafter, the mixed solution was heated and reacted at 90 ° C. with stirring for 2 hours. After completion of the reaction, the obtained solid product was washed 4 times with 100 ml of toluene at 90 ° C., 30 ml of titanium tetrachloride and 70 ml of toluene were newly added, the temperature was raised to 112 ° C., and the mixture was reacted for 2 hours with stirring. After completion of the reaction, the solid catalyst component was obtained by washing 10 times with 100 ml of n-heptane at 40 ° C. The titanium content in the solid catalyst component was measured and found to be 3.7% by weight.
[0080]
[Formation and polymerization of polymerization catalyst]
A polymerization catalyst was formed and polymerized in the same manner as in Example 1 except that the solid catalyst component obtained as described above was used. The results are shown in Table 1.
[0081]
Comparative Example 2
10 g of the solid material obtained in Example 1 (no operation after the treatment with tetraethoxytitanium), 15 ml of tetrabutoxytitanium, 9 ml of tetraethoxysilane was inserted and stirred, heated to 130 ° C., a toluene solution of 16 g of phenol was added, and the mixture was reacted at 130 ° C. for 1 hour. Then, it is cooled to −20 ° C., 30 ml of titanium tetrachloride is added to form a uniform solution, and when the temperature is raised to 110 ° C., 1.5 g of phthalic anhydride is added and reacted for 1 hour to precipitate a solid. And then washed with toluene to obtain a solid containing a magnesium compound. To this was added 50 ml of toluene and 2.4 ml of di-n-butyl phthalate to form a suspension. On the other hand, 30 ml of titanium tetrachloride and 20 ml of toluene are charged into a 500 ml round bottom flask which is sufficiently replaced with nitrogen gas and equipped with a stirrer to form a mixed solution, and the above suspension is suspended in this mixed solution. The liquid was added. Thereafter, the mixed solution was heated and reacted at 90 ° C. with stirring for 2 hours. After completion of the reaction, the obtained solid product was washed 4 times with 100 ml of toluene at 90 ° C., 30 ml of titanium tetrachloride and 70 ml of toluene were newly added, the temperature was raised to 112 ° C., and the mixture was reacted for 2 hours with stirring. After completion of the reaction, the solid catalyst component was obtained by washing 10 times with 100 ml of n-heptane at 40 ° C. In addition, it was 2.1 weight% when the titanium content rate in this solid catalyst component was measured.
[0082]
[Formation and polymerization of polymerization catalyst]
A polymerization catalyst was formed and polymerized in the same manner as in Example 1 except that the solid catalyst component obtained as described above was used. The results are shown in Table 1.
[0083]
[Table 1]

[0084]
As is apparent from the SEM photograph in FIG. 2, the surface of the diethoxymagnesium obtained by the method of the present invention has little adhesion of fine powder, and the operation after the tetraethoxy titanium treatment has not been performed (the SEM photograph in FIG. 1). It can be seen that the surface is smoother. Further, the results in Table 1 show that high activity and high stereoregularity are maintained and the generation of a fine powder polymer is extremely small by carrying out polymerization of propylene using the solid catalyst component and catalyst of the present invention.
[0085]
【The invention's effect】
A novel dialkoxymagnesium is obtained by the dialkoxymagnesium production method of the present invention. In addition, the catalyst by the solid catalyst component for olefin polymerization prepared using dialkoxymagnesium obtained by the production method is a polymer with extremely fine powder while maintaining a high degree of stereoregularity and yield of the polymer. Obtainable. Therefore, general-purpose polyolefin can be provided at low cost.
[Brief description of the drawings]
FIG. 1 is an SEM photograph of diethoxymagnesium that has not been operated after the treatment with tetraethoxytitanium.
2 is an SEM photograph of diethoxymagnesium of the present invention produced in Example 1. FIG.
FIG. 3 is a flowchart showing steps for preparing the polymerization catalyst of the present invention.

Claims (4)

  Metal magnesium and ethanol are reacted in the presence of a catalyst of iodine, diethoxymagnesium or magnesium chloride to obtain a solid, and then the solid and the tetraalkoxytitanium compound having 1 to 4 carbon atoms are converted to the carbon number 1 to 4 A tetraalkoxytitanium compound is contacted in an inert organic solvent that does not dissolve the solid matter to form a suspension, and then the solvent in the suspension is removed by decantation or filtration. A method for producing dialkoxymagnesium.   The method for producing dialkoxymagnesium according to claim 1, wherein the tetraalkoxytitanium compound having 1 to 4 carbon atoms is tetraethoxytitanium. Dialkoxymagnesium (a) and tetravalent titanium halogen compound (b) produced by the production method according to claim 1, methyl formate, ethyl acetate, vinyl acetate, propyl acetate, octyl acetate, cyclohexyl acetate , Ethyl propionate, ethyl butyrate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, octyl benzoate, cyclohexyl benzoate, phenyl benzoate, methyl p-toluate, ethyl p-toluate, anisic acid Methyl, ethyl anisate, diethyl maleate, dibutyl maleate, diethyl diisopropyl malonate, dipropyl diisopropyl malonate, diisopropyl diisopropyl malonate, dibutyl diisopropyl malonate, diisobutyl diisopropyl malonate, dimethyl adipate Diethyl adipate, dipropyl adipate, dibutyl adipate, diisodecyl adipate, dioctyl adipate, esters or ether selected from the aromatic dicarboxylic acid diester, ethyl ether, propyl ether, butyl ether, amyl ether, diphenyl ether, 9, For polymerization of olefins, characterized by being prepared by contacting with ethers (c) selected from 9-bis (methoxymethyl) fluorene, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane Solid catalyst component. (A) The solid catalyst component for olefin polymerization according to claim 3,
(B) The following general formula (1); R ¹ _p AlQ _3-p (1)
(Wherein R ¹ represents an alkyl group having 1 to 4 carbon atoms, Q represents a hydrogen atom or a halogen atom, and p is a real number of 0 <p ≦ 3) and ( C) Methyl formate, ethyl acetate, vinyl acetate, propyl acetate, octyl acetate, cyclohexyl acetate, ethyl propionate, ethyl butyrate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, octyl benzoate, cyclohexyl benzoate , Phenyl benzoate, methyl p-toluate, ethyl p-toluate, methyl anisate, ethyl anisate, diethyl maleate, dibutyl maleate, diethyl diisopropylmalonate, dipropylmalonate dipropyl, diisopropylmalonate diisopropyl, diisopropylmalon Dibutyl acid, diisopropyl Ron diisobutyl, dimethyl adipate, diethyl adipate, dipropyl adipate, dibutyl adipate, diisodecyl adipate, dioctyl adipate, esters selected from the aromatic dicarboxylic acid diester, methyl ether, ethyl ether, propyl ether, butyl ether , Amyl ether, diphenyl ether, 9,9-bis (methoxymethyl) fluorene, ethers selected from 2-isopropyl-2-isopentyl-1,3-dimethoxypropane or the following general formula (2); R ² _q Si ( OR ³ ) _4-q (2)
(In the formula, R ² is an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group, a phenyl group, a vinyl group, an allyl group, or an aralkyl group, and may be the same or different. R ³ has 1 carbon atom. Represents an alkyl group, a cycloalkyl group, a phenyl group, a vinyl group, an allyl group, or an aralkyl group, which may be the same or different, and q is an organic group represented by 0 ≦ q ≦ 3. A catalyst for olefin polymerization comprising a silicon compound.

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