JPS62127305A - Production of olefin polymer - Google Patents

Abstract

PURPOSE:To obtain the titled highly stereoregular polymer having a high bulk density and a low residual catalyst content in high activity while suppressing formation of fine powder, by polymerizing an alpha-olefin in the presence of a catalyst comprising a specified solid catalyst component, an organoaluminum compound and an organosilicon compound. CONSTITUTION:A solid catalyst component (A) containing 0.1-20wt% (in terms of Ti) Ti compound is obtained by contacting a solid obtained by allowing a support having a specific surface area of 10-800m<2>/g, a mean pore diameter >=10Angstrom and a mean particle diameter of 0.1-1,000mu to carry an Mg compound of the formula (wherein R<1-2> are each a 1-10C alkyl, cycloalkyl, aryl or the like and l is 0-2) with an aromatic dicarboxylic acid diester (b) and a titanium halide (c). An alpha-olefin is polymerized at 20-100 deg.C and a pressure of 1-100kg/ cm<2>G in the presence of a catalyst comprising component A, an organoaluminum compound (B) in an amount to provide an Al to Ti atomic ratio of 1-2,000 and an Si-O-C bond-containing organosilicon compound (C).

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for producing an olefin polymer.

[Prior art and its problems] Conventionally, there has been a method for producing olefin polymers using a Ziegler-Natsuta type catalyst that combines a solid catalyst component in which a titanium component is supported on a magnesium halide body and an organic aluminum compound component. Known (Japanese Patent Application Laid-Open No. 53-3
No. 9991+4i, etc.).

Although this catalyst has relatively high activity, since magnesium halide remains in the resulting polymer, when the olefin polymer obtained by this method is molded, it may accelerate corrosion of the molding machine or cause poor appearance. The disadvantage is that a molded product is formed.

On the other hand, a solid catalyst component obtained by holding a magnesium dialkoxide on a halogen-free metal oxide support such as SiO2 and then reacting an electron-L compound such as a carboxylic acid monoester with a halogenated titanium compound is used. A method using
(See No. 807).

However, this method had low catalytic activity and the resulting polymer had poor unibody regularity, making it impossible to put it to practical use.

[Object of the Invention 1 This issue 11 was made based on the 1i1/11 consideration).

That is, an object of the present invention is to solve the problems in the conventional method, and to produce an olefin having a high degree of body regularity and bulk density, and with less generation of polymer fine powder, by using a highly active t-gold catalyst. The purpose is to provide the production power υ of ball coalescence.

[L stage for achieving the above-mentioned objective 11] The gist of the present invention for achieving the above-mentioned objective is to provide at least one original oxide and/or selected from Groups II to IV elements of the periodic table. A composite inorganic oxide containing at least one of these oxides has the general formula % (wherein, R1 and R2 are) ^alkylno, cycloalkylno, (, aryl group, or 7 (R1 and RZ may be different or the same depending on the intermediary, and one sentence is a positive number from O to 2.) A solid substance containing a magnesium compound represented by
A catalyst consisting of a solid catalyst component (A) obtained by contacting an aromatic dicarboxylic acid diester with a halogenated titanium compound, an organoaluminum compound (B), and an organosilicon compound having a Si-0-C bond (C) in the presence of α
- A method for producing olefin beads characterized by polymerizing olefins.

The solid catalyst component (A) is a solid substance in which a specific magnesium compound is supported on a specific oxide and/or a composite inorganic oxide containing at least one of these oxides, an aromatic dicarboxylic acid diester, Obtained by contacting with a halogenated titanium compound.

The specific oxide is an oxide of an element belonging to groups n to 1 of the periodic table, for example, MgO1Cab, B20
1, SiO2, SaO2, AIL? 03 etc. are mentioned.

Further, the composite inorganic oxide is an oxide containing at least one type of oxide of an element belonging to Groups II to IV of the periodic table, for example, Si02-A 203.5102-Mg0
1S io2-TiO2, SiO? -V20s,
Examples include SiO2Cr2O2, S+07-Ti02-MgO, and the like. These various oxides and composite inorganic oxides may be used individually in East Germany, two or more of the above oxides may be used in combination, or two or more of the above complex inorganic oxides may be used in combination. They may be used in combination at the same time, or the above oxide and the composite inorganic oxide described in 1.1.1 may be used in combination at the same time.

In addition, although this oxide and composite inorganic oxide may be used as they are, silicon halides such as tetrahalogenated silane, hexahalogenated disilane, heptanoalkyltrihalogenated silane, and dialkyldihalogenated silane, and methanol It is preferable to carry out pretreatment by contacting with alcohols such as , ethanol, etc. in this order before use.

This is because such pretreatment allows the amount of catalytic metal to be supported to be reduced.

These specific oxides and composite inorganic oxides serve as carriers for the catalyst, so if we were to define a preferred form from the viewpoint of properties as a carrier, the specific surface [(BET method) is 10
-800 rn'/g, average pore size of 10 A or more, and average particle size of 0.1 to 1000 μm are desirable.

Among the various oxides and composite inorganic oxides, Si02, which has a severe form, is preferable.

The specific magnesium compound has the general formula %) [wherein 1(+ and R2 have 1 to 10 carbon atoms)
is an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group, and R1 and R2 may be different or the same, and the stand is 0 to 2 +E Pi. ], and as such a magnesium compound, even If, Mg (-〇CH3)7
, Mg (-0CyH5)7, Mg (-0C3
Hl)7, Mg (-0Cb H6)7, Mg
(-0Cb HN)? , Mg (-0C8Hz)? , Mg (-0CH3)(-0C2Hs).

Among these, dialkoxymagnesium is preferred.

The solid substance is one in which a specific magnesium compound is supported on the specific oxide and/or composite inorganic oxide.

+111 Magnesium compound [Mg (ORI)
1(OH2) 2 sentences] on the surface of the specific oxide and/or composite inorganic oxide,
(1) A method of dissolving or dispersing the rfJ magnesium compound in an organic solvent in advance, and then adding and contacting the oxide and/or composite inorganic oxide, (
2) Reacting Mg with RIOH and/or R20H in the presence or absence of an organic solvent without using the magnesium compound, and combining the resulting product with the oxide and/or composite inorganic oxide. Examples include a method of contacting and supporting the material.

In these methods, it is preferable for the catalyst to deposit the magnesium compound as uniformly as possible on the surface of the oxide and/or composite inorganic oxide; It is desirable to contact the oxide and/or the composite inorganic oxide.

Examples of organic solvents mentioned above include hydrocarbons such as aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, and halogenated hydrocarbons, tetramethquine titanium, tetraethoxytitanium, and tetra-n- Examples include alkoxytitanium such as butoxytitanium, alcohol, ether, aldehyde, ketone, carboxylic acid, amine, amide, and the like.

A preferred method for supporting the 1i1 magnesium compound on the surface of the oxide and/or composite inorganic oxide is to combine a solution in which the magnesium compound is dissolved in alkoxy titanium and an aliphatic hydrocarbon with the oxide and/or composite inorganic oxide. With oxides.

A method of contacting at a temperature range of 0 to 100° C. for 5 minutes to 24 hours is exemplified.

In contrast to the oxide used as a carrier, the solid obtained in the above manner may be composed of only a composite inorganic oxide, or may be a mixture of the oxide and the composite inorganic oxide! When mixed with oxides, 0.1% to 20%, especially 0.5% to 10%, as magnesium atoms, based on the total of each oxide.
It is preferable that the material contains % of tonnage.

As the aromatic dicarboxylic acid diester.

Examples include lower alkyl diesters of phthalic acid, terephthalic acid, and isophthalic acid, and more specifically, diethyl phthalate, diethyl phthalate, dipropylphthalate, methyl phthalate, methyl ethyl phthalate, methyl propyl phthalate, and methyl phthalate. Butyl phthalate, ethyl propyl phthalate, ethyl isobutyl phthalate, probyl isobunal phthalate, dimethyl terephthalate, diethyl terephthalate, dipropyl terephthalate, diisobutyl terephthalate, methyl ethyl terephthalate, methyl propyl terephthalate, methyl isobutyl terephthalate, ethyl propyl terephthalate, ethyl isobutyl terephthalate , Propyl Isobutyl Terephthalate, Dimethyl Isophthalate, Diethyl Isophthalate, Dipropyl Isophthalate, Diisobutyl Isophthalate, Methyl Ethyl Isophthalate, Methyl Propyl Isophthalate, Methyl Isobutyl Isophthalate, Ethyl Propyl Inphthalate, Ethyl Isobutyl Isophthalate, Propyl Isobutyl Iso Examples include phthalates. Among these, preferred are dipropyl phthalate, diimbutyl phthalate, and the like.

As the halogenated titanium compound, which is one of the raw materials for the solid catalyst component (A), those represented by the following general formula can be used.

T i (OR' ) 4nXn (here, R1 is iRJ an alkyl group of 1 to 10, an aryl group, or an aralkyl group, n is a real number from 0 to 4, and X is /\ Specifically, TiCR4, TiBr4. T
i14. Tetrahalogenated titanium such as Ti (OC
H3) C13,Ti (OC2H5)CR3, (n-C
aR90) TiC,i:r.

Trihalogenated alkoxytitanium such as Ti(OC2R5)Br3; Ti(OCH3)2C or?
.

T i (OC2R5)2 Ci2 , (n-Cs
R90)2 Ti C1z, Ti (OC3H
r )2 Dihalogenated alkoxytitanium such as C12; Ti(OCH3):I CJl, Ti (OC?
R5) 3C intersection.

(n-Cs R90)3 TiC1,Ti (Q
Examples include monohalogenated trialkoxytitanium such as CHx)xBr. These may be used alone or as a mixture. Among these, it is preferable to use a high halogen-containing substance, and it is particularly preferable to use titanium tetrachloride.

The solid catalyst component (A) can be prepared, for example, as follows.

That is, the solid material, the serious aromatic dicarboxylic acid diester, and the halogenated titanium compound are mixed in an inert solvent such as hexane, heptane, benzene, or toluene at a temperature of 0 to 200°C, preferably 10 to 150°C.
This can be carried out by contacting for minutes to 24 hours.

Note that the aromatic dicarboxylic acid diester and/or the halogenated titanium compound may be allowed to coexist during the preparation of the solid material, and after the +NiNi type product and the aromatic dicarboxylic acid diester are reacted, the halogen A titanium chloride compound may also be contacted.

The solid catalyst component (A) thus prepared preferably contains 0.1 to 20% by weight of titanium atoms, particularly 0.5 to 10% by weight. desirable.

The catalyst in the method of this invention is a warm solid catalyst component (^
), organoaluminum compound (B), and Si-0-C
It is formed from an organosilicon compound (C) having a bond.

The organoaluminum compound (8) is not particularly limited, and has the general formula % formula % (wherein R3 is) an alkyl group of R element 11 [1-10,
cycloalkyl group or aryl group, m is 1 to 3
is a real number, and X represents a halogen source such as chlorine or odor.) is widely used.

Specifically, trialkylaluminum such as trimethylaluminum, triethylaluminum, triisopropylaluminum, triisobutylaluminum, trioctylaluminum, diethylaluminum monochloride, diisopropylaluminum monochloride,
Dialkyl aluminum monohalides such as diisobutyl aluminum monochloride and dioctyl aluminum quinochloride, and alkyl aluminum sesquihalides such as ethyl aluminum sesquichloride are preferred, and mixtures thereof are also preferred.

The organosilicon compound (G) having a Si-0-C bond
Various materials can be used as such, and examples include alkoxysilanes and aryloxysilanes. Examples of this include general formula 1 (%) [wherein R4 represents an alkyl group, a cycloalkyl group, an aryl group, an alkenyl group, a haloalkyl group, an aminoalkyl group, or a halogen, and R5 represents an alkyl group, a cycloalkyl group, or a halogen group; represents a human, an aryl group, an alkenyl group, or an alkoxyalkyl group, and p is O≦p≦3. However, two R's and (4-p) OR5s may be the same or different, respectively.

Other examples include siloxanes having an OR5 group or silyl esters of carboxylic acids.

Furthermore, as another example, a silicon compound having no Si-0-C bond and a compound having an O-C bond may be reacted with each other during polymerization of α-olefin, and Si-0-
Examples include those converted to organic non-silicon compounds (C) having C bonds; for example, a combination of SiCRa and alcohol can be considered.

Organic unsilicon compound (C) having the above Si-0-C bond
Specific compounds include trimethylmethoxysilane,
Trimethylethoxysilane, dimethyldimethoxysilane, dimethyljethoxysilane, diphenyldimethoxysilane, methylphenyldimethoxysilane, diphenyljethoxysilane, ethyltrimethoxysilane, vinyltrimethoxysilane, methyltrimethoxysilane, phenyltrimethoxysilane, r -Chlorpropyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, vinyltriethoxysilane, butyltriethoxysilane, phenyltriethoxysilane, r-7 minopropyltriethoxysilane, chlortriethoxysilane, ethyltriiso Examples include propoxysilane, vinyltrubutoxysilane, ethyl silicate, butyl silicate, trimethylphenoxysilane, methyltriaryloxysilane, vinyltris(β-methoxyethoxy)silane, vinyltriacetoxysilane, and dimethyltetraethoxydisiloxane. Among these, in particular, methyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, ethyltrinidoxinane, vinyltriethoxysilane, phenyltriethquinsilane, vinyltributoxysilane, ethyl silicate, diphenyldimethoxysilane, methyl Preferred are phenyldimethoxysilane, diphenyljethoxysilane, and the like.

The component composition of the catalyst in the method of this invention is usually:
The solid catalyst component (A) and the organoaluminum compound (B
), Au/Ti (atomic ratio) is 1 to 1000,
Preferably, the ratio is 5 to 500, and for the organosilicon compound (C), the molar ratio of organosilicon compound/organoaluminum compound is 0.01 to 10, preferably 0.02 to 2. It is.

In the method of the present invention, an olefin polymer is produced by polymerizing an α-olefin in the presence of the catalyst.

The α-olefin can be represented by the general formula 1 (wherein R6 represents water, a furkylin group or a cycloalkyl group having 1 to 20 carbon atoms), such as ethylene, propylene, butene, etc. -1,
Examples include linear monoolefins such as pentene-1 and octene-1, branched monoolefins such as 4-methyl-pentene-1, and vinylcyclohexene.

The α-olefin to be combined is not limited to one kind of GDR, but a plurality of α-olefins of NgfI may be copolymerized to produce a random copolymer or a block copolymer.

At the time of co-consolidation, it is also possible to convert unsaturated compounds such as J(yellow diene) and II conjugated diene to togane.

For the polymerization reaction in the method of the present invention, methods and conditions conventionally used in the field of olefin polymerization technology can be employed.

The polymerization temperature at that time is 20 to 100°C, preferably 40 to 100°C.
The range is 90℃, and the combined pressure is usually 1-100K.
g/crn' G, preferably 5-50K g/
crn'G) range.

The bonding reaction can generally be carried out by a solution polymerization method using aliphatic, alicyclic, aromatic hydrocarbons or a mixture thereof as a solvent, such as propane, butane, or pentane.

Hexane, heptane, cyclohexane, benzene, etc.
and mixtures thereof can be used. Further, a gas phase polymerization method and a bulk polymerization method using the liquid upper layer itself as a solvent can also be applied.

The molecular weight of the olefin polymer produced in the method of the present invention varies depending on the reaction mode, catalyst system, and polymerization conditions, but can be controlled, if necessary, by adding M, such as hydrogen, alkyl halide, dialkylzinc, etc.

[Effects of the Invention] According to the present invention, (1) Since a catalyst with high catalytic activity and long duration of activity is used, the polymerization reaction can be carried out stably even when performing multi-stage polymerization. (2) Almost no catalyst residue remains in the produced olefin polymer, and the olefin polymer can be processed well before molding.

(3) An odorless olefin polymer with high stereoregularity can be produced, and an olefin polymer with a narrow molecular weight distribution can be obtained.

(5) The olefin polymer produced contains 100 μm
This is a useful olefin polymer that has a number of advantages, such as: There is almost no polymer fine powder, and the olefin polymer can be transported in powder form without clogging pipes. A manufacturing method can be provided.

[Examples] Next, Examples and Comparative Examples of the present invention will be shown to further specifically illustrate the present invention.

(Example 1) (0) Preparation of solid catalyst component Calcined silicon oxide J (Fuji Davison company, grade 95
2. Specific surface area 350rrr'/g, average particle size 54-85
gm) 10.0g of jetoxymagnesium (501 layer o9), tetra-n-butoxytitanium (30 ■ 0 sentences)
Add 50ml of n-hebutane solution containing
Contacted for an hour. After that, 25 ml of Improper Tool was added dropwise, stirred at 80"C for 1 hour, and decanted 3 times with 100 ml of n-hebutane.
The catalyst carrier was dried under reduced pressure for 1 hour to form a white catalyst carrier (also, this catalyst carrier contained 3.8 small percent of magnesium atoms. 5
The mixture was placed in a glass container, and 50 mM of n-hebutane, 1.9 g of diisobutyl phthalate, and 45 g of titanium tetrachloride were added. The mixture was stirred at reflux F for 1 hour. Thereafter, the clear liquid E was removed by decantation, and the obtained solid portion was thoroughly washed with 8n-heptane to remove 11 tons of solid catalyst components. This catalyst contains 5. +Gyokushu% Ti was included.

■Polymerization of propylene In an argon purged autoclave, 0.006 mg of the solid catalyst component suspended in 50 m of hexane (in terms of chikun atoms) and 0.15 meal of triethylaluminum silane were added. I put it in. After reducing the pressure inside the autoclave to remove argon, 310 g of propylene and 0.7 Nl of hydrogen were charged. After 5 minutes, the temperature was raised to 70°C, and a thinning of 211ν was performed at 70°C. After cooling the autoclave and purging the propylene, the contents were taken out and dried under reduced pressure to obtain 20.2 g of polypropylene powder. The density of this powder is 0.40g/crn", 10
The amount of fine powder of 0 μm or less was 0.2% + j%, and the fluidity was excellent. Further, the content of this Parater C-boiling n-heptano extract (polymer +7):', 1 (+, 1.) was 96.8%. This alipropylene is GPCrJ
The determined molecule, Mw/Mn, was 42, and the t18 element jlX in this polymer, analyzed by fluorescent X-ray analysis, was 81PP.

(Example 2) The same procedure as in Example 1 was carried out except that dipropyl phthalate was used instead of diisobutyl 2-thalerate.

The f′J polypropylene powder is 19.8 g, and its bulk density is 0.40 g/cm′,
Fine powder of 1 oop m or less is 0.2 ton;, 1%, 1.1.
was 97.1%. Also, this polypropylene is
PC-cJllI fixed molecule! -minAj (Mi+/
M n ) is 3.8 Te, and Ii! in this polymer analyzed by fluorescent X-ray analysis! The concentration of element S11 was 70 pp-. (Example 3) The same procedure as in Example 1 was carried out using diphenyldimethoxysilane instead of phenyltriethoxysilane.

The folded polypropylene powder weighs 21.3 g'r'' and its bulk 1^ is 0.40 g/Cm', l
Ong mLJ fine powder is 04 tons;, 1%, 11 is 9
It was 72%. In addition, this polypropylene was measured by GPC/1. : min 1u (My/Mn) is 42, and my in this polymer analyzed by fluorescence x6 analysis.
+: 'l' was fi2ppm.

(Example 4) Instead of silicon oxide, aluminum + [i, A-11i manufactured by & Aluminum Co., Ltd., PA 40-50 p-m
The procedure was carried out in the same manner as in Example 1 except that the following was used.

The obtained polypropylene powder weighs 215 g, and its l;'+:density is 0.28 g/c rn', 1
Fine powder of 00μm or less is 1.2 tons/21%, 1.1 is 97
．． It was 0%. The molecular weight of this polypropylene measured by GPC is 111/10 (My/Mn), which is 4.1 TeJ.
N> in this polymer analyzed by fluorescent X-ray analysis
L l (r was 6spp fat. (Comparative Example 1) Diisobutyl phthalate 1.9 *mo, ann instead of Q, C!, n-butyl fragrant 3.4 gaon,
7 x :jtz t')
The same procedure as in Example 1 was carried out except that P-)methyl rulylate O axis moL;l was used instead of mol. The obtained polypropylene para d- weighed 9.8 g, and its “,2
Density is 0.36g/C, fine powder below 1100AL is 0.
, 5 tons: a%, 1.1. was 95.0%. In addition, this polypropylene was measured by GPC: /, l
The j distribution (Mw/Mn) is 7.8 Te, and the A:r: in this polymer analyzed by fluorescence X & 9 analysis is 148P.
p ■ (Example 5) (1) Preparation of solid catalyst component 0,! which was replaced with argon! In a glass container of No. 11, baked silicon oxide (manufactured by Toshichi Davison Co., Ltd., Grate 952, specific surface area 350 rn'/g, + with an average particle size of 54 to 65
gm), 100 m of trimethylchlorosilane, and Q were added; and after reacting for 12 hours while stirring in a flowing oven,
The mixture was decanted three times with n-hebutane and smoked dry.

Using 10.0 g of the obtained solid, Example 1 is described below.
I did the same thing.

The magnesium compound in the catalyst carrier (solid matter in the solid catalyst component) is 3.21Ttr-% as magnesium source f.
The amount of the halogenated titanium compound in the solid catalyst component was 2.4 tons+,+,% as the titanium raw material f-.

■ In the case of propylene, it was carried out in the same manner as in Example 1. The obtained polypropylene powder weighed 175 g, and its:, °, bi+If
t is 0.40g/cm', 100gm or more fine powder is 0, 3-TX, "+:%, 1.1. is 972%
Met. Also, 11! in the polymer all determined by fluorescence X-rays! Yoj, 1 was a 7.2pp layer, and the molecular weight, ;:min IIJ (Mw/Mn) measured by CPC was 3.3.

(Comparative Example 2) Diisobutyl phthalate 1,9
0. Inspection f! #n-ethyl 3.4 ms+o sentence, phenyltrinidoxin run 0.15 days P- instead of OL)
The same procedure as in Example 5 was carried out except that 0.4 mmol of methyl ruylate was used. The polypropylene powder obtained was 81 g, and its 1.1 was 95.4%.

In addition, chlorine ji in the polymer determined by fluorescence X-rays:
was 16.2 pP-, and GPC showed that the side chamber size was 71j (Mw/Mn) of 81.

Patent applicant: Idemitsu Petrochemical Co., Ltd.
+l, '7 Showa 6t<+December 1011! 1986<1 Patent Application No. 265266 2 Title of Invention Manufacturing power of olefin 11 combination V.

3. Relationship with Sleeve 11-Participant/11ji1 Particularly, h Applicant's address (+, I;
Place) Higashij; ζff1T...To Marunouchi Gomoku 11-1-4, Agent address: 8rl 19 Akira 5, Central Nishishin, Nishi-Shinjuku, Shinjuku-ku, Tokyo? 1i3N'i Name J1 Science 1. (8759) Naoki Fukumura'll,)
I; Old Roco 361-27385, supplement I1. 1141 of command (spontaneous) 6, increased by complement + E 9, 1
Number of jl None 7, subject of correction l Specification 11: [';l clear, iT III explanation''
Fill out the column in Sleeve II as shown in G.

(1)" Leading line, p No. 7145-6" itll (7) rM
g(-oct, Hs) t, J as rlvlg(
-0C+, 8. )2,” is corrected.

(2) Details, 1: No. 17 p1211? ill no i' 1
~111011,&r! C<C; t5-500 Tona 7
゜；、2」r l-20011、Cmasu s-
Correction 1 to Ko-J which becomes +uoo! - to do.

(]) Details 1 inch 18th 2? ill's r 4ia aluminum compound ThJ is revised to ``organotitanium compound''.

(4) 1Jljllll Old 18th Lt31r11~4?
r11norrO, 01~10, kf! L/<+,
tO,02~2tf:tle:+knee C al, J'e
'j'U, s ~SOD, Utsuma L/< Ha1~1
00 trtle:+:,"C.1,:If1.-
4-ru.

(5) If thin, p 26th +7? rll-18b
If 'n-ethyl anthyl-anxate' is converted to 'n-ethyl anthyl anthioate', il+l is added.

- Below 1. −

Claims (1)

[Scope of Claims] An oxide of at least one element selected from Groups II to IV elements of the periodic table and/or a composite inorganic oxide containing at least one of these oxides has the general formula Mg (OR ^1)l(OR^2)_2-l (However, in the formula, R^1 and R^2 have 1 to 10 carbon atoms
is an alkyl group, cycloalkyl group, aryl group or aralkyl group, R^1 and R^2 may be different or the same, and l is a positive number of 0 to 2. ) A solid substance supported by a magnesium compound represented by
A catalyst consisting of a solid catalyst component (A) obtained by contacting an aromatic dicarboxylic acid diester with a halogenated titanium compound, an organoaluminum compound (B) and an organosilicon compound having a Si-O-C bond. A method for producing an olefin polymer, which comprises polymerizing an α-olefin in the presence of an α-olefin.