JP3492455B2 - Olefin polymerization catalyst and method for producing olefin polymer using the same - Google Patents

Description

Detailed Description of the Invention

<Background of the Invention>

TECHNICAL FIELD The present invention relates to a method for producing an olefin polymer. More specifically, the present invention improves polymerization processability by polymerizing an olefin having 3 or more carbon atoms using a catalyst obtained by combining a specific solid catalyst component, an organoaluminum compound and a specific sulfonic acid derivative compound. The present invention relates to a method for producing an olefin polymer, which is capable of obtaining an excellent polymer having high stereoregularity in a high yield.

[0002]

2. Description of the Related Art In recent years, many proposals have been made for producing a highly stereoregular polymer of propylene in a high yield by using a solid component containing titanium, magnesium and halogen as essential components (for example, a special method). Kaisho 57-6331
No. 0, No. 57-63311, No. 57-63312,
58-138706, 58-138711, 58-138705).

[0003]

However, these catalyst systems cannot be said to have sufficient stereoregularity of the polymer, and since the molecular weight distribution is narrow, the moldability is poor, and further improvement is required. It was

[0004]

[Means for Solving the Problems]

[Outline of the Invention] The present invention provides a propylene polymer having a high stereoregularity with excellent moldability by combining a specific solid catalyst component and an organoaluminum compound component with a specific sulfonic acid derivative compound as an external donor. It is intended to provide the combined product in high yield. <Summary> That is, the olefin polymerization catalyst according to the present invention is characterized by comprising the following components (A), (B) and (C) in combination.

Component (A): Titanium, magnesium, halogen and a solid catalyst component containing an electron-donating compound as essential components Component (B): Organoaluminum compound component (C): General formula R ¹ SO ₃ AlR ² ₂ The sulfonic acid derivative compound represented by the formula (in the formula, R ¹ is an aromatic, cycloaliphatic or branched aliphatic hydrocarbon group, R ² is a hydrocarbon group). The method for producing a coalescence is characterized in that an olefin is brought into contact with the above-mentioned olefin polymerization catalyst for polymerization. <Effect> According to the present invention, it is possible to obtain a highly crystalline olefin polymer having excellent moldability and high yield. Such an olefin polymer is suitably used for applications such as automobile parts, home electric appliance parts, and packaging materials for which high rigidity is required.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The process for producing an olefin polymer according to the present invention comprises components (A), (B) and (C).
Is characterized in that the olefin is polymerized in the presence of a catalyst. <Catalyst> The catalyst used in the present invention is a combination of specific components (A), (B) and (C). Here, "combined" does not mean that the components are only those listed (that is, A, B, and C), and other components may be present within a range that does not impair the effects of the present invention. Does not exclude coexistence. <Component (A)> The component (A) is titanium, magnesium,
It is a solid catalyst component containing halogen and an electron donating compound as essential components.

Here, "comprising as essential components" means that other than the above-mentioned four components, other purposeful elements may be contained, and these elements are present as being bound to each other. Is also good.

Examples of the magnesium compound used as the magnesium source in the present invention include magnesium halide, dialkoxy magnesium, alkoxy magnesium halide, magnesium oxyhalide, dialkyl magnesium, magnesium oxide, magnesium hydroxide and magnesium carboxylate. Can be mentioned.
Of these, magnesium halide is preferable.

The titanium compound serving as the titanium source has the general formula T
i (OR ³ ) _4-n X _n (wherein R ³ is a hydrocarbon group, preferably having 1 to 10 carbon atoms, X is halogen, and n is 0 ≦ n ≦ 4). The compound represented by the number is shown.

Specific examples of such titanium compounds include, for example, TiCl ₄ , TiBr ₄ , and Ti (OC ₂ H _{2
5) Cl 3, Ti (OC} 2 H 5) 2 Cl 2, Ti (OC
_{2 H 5) 3 Cl, Ti} (O-iC 3 H 7) Cl 3, Ti
_{(O-nC 4 H 9)} Cl 3, Ti (O-nC 4 H 9) 2
Cl ₂ , Ti (OC ₂ H ₅ ) Br ₃ , Ti (OC
_{2 H 5) (O-nC} 4 H 9) 2 Cl, Ti (O-nC 4
_{H 9) 3 Cl, Ti (} OC 6 H 5) Cl 3, Ti (O-
_{iC 4 H 9) 2 Cl 2} , Ti (O-nC 5 H 11) C
_{l 3, Ti (O-nC} 6 H 13) Cl 3, Ti (OC 2 H
_{5) 4, Ti (O-} nC 3 H 7) 4, Ti (O-nC 4
_{H 9) 4, Ti (O} -iC 4 H 9) 4, Ti (O-nC
Etc. ₆ H _{13) 4} and _{Ti (O-nC 8 H 17} ) 4 and the like.

As the titanium compound, a complex compound of TiX ' ₄ (where X'represents halogen) and an electron-donating compound (detailed later) can also be used. Specific examples of such complex compounds include, for example, TiCl ₄ .CH.
₃ CO ₂ C ₂ H ₅ , TiCl ₄ · C ₆ H ₅ COCl, T
such _{iCl 4 · C 6 H 5 CO} 2 C 2 H 5 and the like.
Among these titanium compounds, preferred is TiCl
₄ and _{Ti (O-nC 4 H 9} ) _4.

Halogen is usually supplied from the above-mentioned magnesium and / or titanium halogen compounds, but from known halogenating agents such as aluminum compounds, silicon halides, and phosphorus halides. You can also The halogen contained in the constituent components may be fluorine, chlorine, bromine, iodine or a mixture thereof, and chlorine is particularly preferable.

Examples of the electron-donating compound include alcohols, phenols, ketones, aldehydes, carboxylic acids, esters of organic or inorganic acids, acid halides, acid amides, acid anhydrides and Si-O-. Examples thereof include oxygen-containing electron donors such as C-bond-containing organosilicon compounds, nitrogen-containing electron donors such as amines, nitriles and isocyanates. Among these, preferred are organic acid esters, organic acid halides and Si-O-
It is an organic silicon compound containing a C bond. Further, two or more kinds of electron donating compounds can be used in combination.

Examples of the organic acid ester include aliphatic carboxylic acid esters such as ethyl acetate, phenyl acetate, cyclohexyl acetate, ethyl propionate, methyl butyrate, methyl valerate, ethyl stearate and methyl chloroacetate.
Ethyl dichloroacetate, methyl methacrylate and ethyl crotonate, ethyl cyclohexylcarboxylate and the like, and aromatic carboxylic acid esters such as ethyl benzoate,
Examples thereof include methyl toluate, ethyl toluate, methyl anisate, diethyl phthalate, dibutyl phthalate, diheptyl phthalate and dibenzyl phthalate. Among these, phthalic acid diester is preferable.

Organic acid halides include aliphatic carboxylic acid halides such as acetyl chloride, and aromatic carboxylic acid halides such as benzoyl chloride,
Examples thereof include toluic acid chloride, anisic acid chloride, phthaloyl chloride, isochlorophthaloyl and the like. Preferred among these are phthalic acid halides, especially phthalic acid chloride.

As the Si—O—C bond-containing organosilicon compound, a compound represented by the general formula R ⁴ R ⁵ _3-m Si (OR ⁶ ) _m is used. Here, R ⁴ is a branched or cyclic aliphatic hydrocarbon group, preferably α having 3 to 20 carbon atoms.
A branched or cyclic aliphatic hydrocarbon group having a secondary or tertiary carbon atom, particularly preferably a branched hydrocarbon group having a carbon number of 4 to 12 and a tertiary carbon atom, R ⁵ is the same as R ^4. Or a different branched, cycloaliphatic or straight chain hydrocarbon group, R ⁶
Is a branched or straight-chain hydrocarbon group having 1 to 8 carbon atoms, preferably 1 to 4 carbon atoms, and m is 2 ≦ m ≦ 3.

Specific examples of the silicon compound include the following substances.

(CH ₃ ) ₃ CSi (CH ₃ ) (OC
_{H 3) 2, (CH 3} ) 3 CSi (CH (CH 3) 2)
(OCH ₃ ) ₂ , (CH ₃ ) ₃ CSi (CH ₃ ) (OC
₂ H ₅ ) ₂ , (C ₂ H ₅ ) ₃ CSi (CH ₃ ) (OCH
₃ ) ₂ , (CH ₃ ) (C ₂ H ₅ ) CHSi (CH ₃ )
_{(OCH 3) 2, ((} CH 3) 2 CHCH 2) 2 Si
(OCH ₃ ) ₂ , (CH ₃ ) ₃ CSi (OCH ₃ ) ₃ ,
_{(CH 3) 3 CSi (OC} 2 H 5) 3, (C 2 H 5) 3
_{CSi (OCH 3) 3, (} CH 3) (C 2 H 5) CHS
_{i (OCH 3) 3, (} C 2 H 5) (CH 3) 2 CSi
_{(OC 2 H 5) 3,} (CH 3) 2 CH (CH 3) 2 CS
_{i (CH 3) (OCH 3} ) 2, (CH 3) 2 CH (CH
₃ ) ₂ CSi (CH ₃ ) (OC ₂ H ₅ ) ₂ , (C
_{2 H 5) 2 CH (C} 2 H 5) 2 CSi (CH 3) (OC
H ₃ ) ₂ , (CH ₃ ) CH (CH ₃ ) ₂ CSi (OC ₂
H _{5) 3,}

[0019]

[Chemical 1]

[0020]

[Chemical 2] The amount of each of the above components used is arbitrary as long as the effects of the present invention are required, but generally the following ranges are preferred.

The titanium compound is used in a molar ratio of 0.001 to 1 with respect to the amount of the magnesium compound used.
The range of 00 is preferable, and the range of 0.01 to 10 is more preferable. When a compound therefor is used as a halogen source, the amount used is a titanium compound and / or
Regardless of whether or not the magnesium compound contains halogen, the molar ratio is preferably 0.01 to 1000 with respect to the amount of the magnesium compound used, and
A range of 100 is more preferable.

The amount of the electron-donating compound used is 0.001 to 1 in molar ratio with respect to the amount of the magnesium compound used.
The range of 0 is preferable, and the range of 0.01 to 5 is more preferable.

The component (A) is produced by using the above-mentioned components by the following production method, for example.

(A) A method in which a magnesium halide is optionally contacted with an electron donating compound and a titanium compound.

(B) A method in which alumina or magnesia is treated with a phosphorus halide compound, and magnesium halide, an electron donating compound and a titanium halogen-containing compound are brought into contact therewith.

(C) A method of bringing a titanium halogen compound and / or a halogen compound of silicon into contact with a solid component obtained by bringing magnesium halide, titanium tetraalkoxide and a specific polymer silicon compound into contact with each other.

As the polymer silicon compound, those represented by the following formula are suitable.

[0028]

[Chemical 3] (Here, R ⁷ is a hydrocarbon group having 1 to 10 carbon atoms, and p is a polymerization degree such that the viscosity of the polymer silicon compound is in the range of 1 to 100 centistokes.) As such a polymer silicon compound, Specifically,
Methyl hydrogen polysiloxane, ethyl hydrogen polysiloxane, phenyl hydrogen polysiloxane, cyclohexyl hydrogen polysiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane and 1,3,5,7,9-pentamethyl Cyclopentasiloxane and the like are preferable.

(D) A method in which a magnesium compound is dissolved in titanium tetraalkoxide and an electron-donating compound, and a titanium compound is brought into contact with a solid component precipitated by a halogenating agent or a titanium halogen compound.

(E) After reacting an organomagnesium compound such as a Grignard reagent with a halogenating agent, a reducing agent, etc.,
A method of bringing an electron donating compound and a titanium compound into contact therewith, if necessary.

A method of contacting a (f) alkoxy magnesium compound with a halogenating agent and / or a titanium compound in the presence or absence of an electron-donating compound.

Among the production methods of the above component (A), (a)
Or (c) is preferable.

The component (A) used in the present invention may be the solid component obtained as described above as it is, or the solid component may be contacted with an olefin in the presence of an organoaluminum compound to obtain the solid component. It may be one that has been subjected to a preliminary polymerization consisting of a small amount of polymerization.

When the component (A) is preliminarily polymerized, the prepolymerization conditions for the olefins for producing the component (A) are not particularly limited, but the following conditions are generally used. preferable. The polymerization temperature is preferably 0 to 80 ° C, more preferably 10 to 60 ° C. As the polymerization amount, 0.001 to 50 g of olefins is preferably polymerized per 1 g of the solid component, and 0.1 to 10 g of olefins is more preferably polymerized.

As the organoaluminum compound component that may be used during the prepolymerization, those generally known as Ziegler type organoaluminum compounds can be used. As a specific example, the component (B) described later, that is, the compound described in the section of the description of the organoaluminum compound can be used.

The amount of the organoaluminum component used during the prepolymerization is Al / T with respect to the Ti component in the solid component (A).
The i (molar ratio) is preferably from 1 to 20, more preferably from 2 to 10.

Examples of the olefins used in the prepolymerization include ethylene, propylene, 1-butene, 1-hexene and 3-methyl-1-butene. <Component (B)> The component (B) is an organoaluminum compound. Specific examples of organoaluminum compounds suitable for use as component (B) include R ⁸ _3-q AlX _q or R ⁹ _3-r Al (OR ¹⁰ ) _r (wherein R ⁸ and R ^8
9 is a hydrocarbon group or hydrogen atom having 1 to 20 carbon atoms which may be the same or different, R ¹⁰ is a hydrocarbon group, X is halogen, q and r are 0 ≦ q <3 and 0 <r <3, respectively. Is a number). Specifically (a)
Trialkylaluminums such as trimethylaluminium, triethylaluminum, triisobutylaluminum, trihexylaluminum, trioctylaluminum and tridecylaluminum, etc., (b) Alkylaluminum halides such as diethylaluminum monochloride, diisobutylaluminum monochloride, ethylaluminum sesquichloride And (a) dialkylaluminum hydride halides such as ethylaluminum dichloride, such as diethylaluminum hydride and dibutylaluminum hydride, and (d) aluminum alkoxides such as diethylaluminum ethoxide and diethylaluminum phenoxide.

In addition to these organoaluminum compounds (a) to (d), other organometallic compounds such as R ¹¹ _3-s Al (O
R ¹² ) _s (where 1 ≦ s ≦ 3, R ¹¹ and R ¹² are the same or different, may be a hydrocarbon group having 1 to 20 carbon atoms,
It is also possible to use an alkyl aluminum alkoxide represented by For example, combined use of triethyl aluminum and diethyl aluminum alkoxide, combined use of diethyl aluminum monochloride and diethyl aluminum ethoxide, combined use of ethyl aluminum dichloride and diethyl aluminum ethoxide, combined use of triethyl aluminum and diethyl aluminum ethoxide and diethyl aluminum chloride, etc. Can be mentioned.

The amount of the component (B) used is 1 / Al (molar ratio) with respect to the titanium component constituting the component (A).
It is in the range of 1000, preferably in the range of 10 to 500. <Component (C)> The component (C) is represented by the general formula R ¹ SO ₃ AlR.
A sulfonic acid derivative compound expressed by ² _2.

Here, R ¹ is an aromatic hydrocarbon group having 6 to 20 carbon atoms, a cyclic aliphatic hydrocarbon group having 5 to 20 carbon atoms, or a branched aliphatic hydrocarbon group having 3 to 10 carbon atoms, R
² is a hydrocarbon group having 1 to 20 carbon atoms (alkyl, aryl, cycloalkyl and its lower alkyl (C _{1 to} C
₆ ) Including a substitution product). The two R ² may be the same or different. Preferably, R ¹ has 6 to 10 carbon atoms.
Aromatic hydrocarbon group, cycloaliphatic hydrocarbon group having 5 to 10 carbon atoms or branched aliphatic hydrocarbon group having 3 to 6 carbon atoms (eg, isopropyl, isobutyl, t-butyl)
And R ² is a hydrocarbon group having 1 to 10 carbon atoms. More preferably, R ¹ is an aromatic hydrocarbon group having 6 to 10 carbon atoms (particularly phenyl and tolyl), and R ² is 1 carbon atom.
~ 6 aliphatic hydrocarbon groups, especially methyl, ethyl, i-butyl, t-butyl, cyclohexyl.

Specific examples of the particularly preferred component (C) are shown below.

As the aromatic sulfonic acid derivative, diethyl aluminum benzene sulfonate, diisobutyl aluminum benzene sulfonate, dicyclohexyl aluminum benzene sulfonate, diphenyl aluminum benzene sulfonate, diethyl aluminum p-toluene sulfonate, diisobutyl p-toluene sulfonate. Aluminum, p-toluene sulfonate dicyclohexyl aluminum, p-toluene sulfonate diphenyl aluminum, p-ethylbenzene sulfonate diethyl aluminum, p-tert-butylbenzene sulfonate diethyl aluminum, m-ethyl benzene sulfonate diethyl aluminum, cyclohexyl sulfonate diethyl aluminum , Diethyl aluminum cyclopentyl sulfonate, iso Chirusuruhon diethyl aluminum, tert- butyl acid diethyl aluminum.

Examples of the derivative of the aliphatic sulfonic acid include diethylaluminum cyclohexylsulfonate, diisobutylaluminum cyclohexylsulfonate, dicyclohexylaluminum cyclohexylsulfonate, diphenylaluminum cyclohexylsulfonate, diethylaluminum isobutylsulfonate, diisobutylaluminum isobutylsulfonate and isobutylsulfone. Examples thereof include dicyclohexyl aluminum acid, diphenyl aluminum isobutyl sulfonate, and diethyl aluminum t-butyl sulfonate.

An external donor other than the component (C) can be used in combination. For example, the Si—O—C bond-containing organosilicon compound exemplified as the electron donor of the component (A) can be used in combination.

The amount ratio of the component (C) used can be selected within a wide range, but the molar ratio to the organoaluminum compound of the component (B) is usually 0.01 to 1.0, preferably 0. It is in the range of 05 to 0.5.

The component (C) can be used not only in the main polymerization but also in the preliminary polymerization. [Catalyst Use / Polymerization] <Polymerization> The catalyst system of the present invention is, of course, applied to ordinary slurry polymerization, but it is substantially solvent-free liquid phase solventless polymerization, solution polymerization, and further gas polymerization. It also applies to phase polymerization.

As a polymerization solvent in the case of slurry polymerization,
Hydrocarbon solvents such as hexane, heptane and pentane can be used.

The polymerization temperature is preferably 30 to 200 ° C,
More preferably 50 to 150 ° C, particularly preferably 60 to
It is 100 ° C. Hydrogen can also be used supplementarily as a molecular weight regulator at that time. <Olefin> The olefins used to polymerize with the catalyst system of the present invention include ethylene, propylene, 1-butene,
They are linear α-olefins such as 1-pentene and 1-hexene, and branched α-olefins such as 4-methyl-1-pentene and 3-methyl-1-butene. Among them, the catalyst of the present invention is particularly suitable for the polymerization of propylene, but it is also preferably used when copolymerizing ethylene or 1-butene with propylene in a random or block manner.

[0049]

Example 1 [ Preparation of component (A)] 200 ml of dehydrated and deoxygenated n-heptane was introduced into a flask thoroughly purged with nitrogen, 0.4 mol of MgCl ₂ and Ti (O) were added.
The _{n-C 4} H _{9) 4} was 0.8 mol introduced and reacted for 2 hours while maintaining the 95 ° C.. After the reaction was completed, the temperature was lowered to 40 ° C, and then methylhydrogenpolysiloxane (20
Introduced 48 ml of Centistokes),
The reaction was carried out for 3 hours. The solid component formed was washed with n-heptane.

Next, 50 ml of purified n-heptane was introduced into a flask sufficiently replaced with nitrogen, and 0.24 mol of the solid component synthesized above was introduced in terms of Mg atom. Then add 25 ml of n-heptane to SiCl
₄ 0.4 mol was mixed and introduced into the flask over 60 minutes while maintaining the temperature at 30 ° C., and reacted at 90 ° C. for 3 hours.

To this, 25 ml of n-heptane was further mixed with 0.02 mol of phthalic acid chloride to obtain 9 parts.
While maintaining at 0 ° C, introduce into the flask over 30 minutes, and
The reaction was carried out at 0 ° C for 1 hour.

After completion of the reaction, it was washed with n-heptane. Then, 0.24 mmol of SiCl ₄ was introduced into this and reacted at 100 ° C. for 3 hours. After completion of the reaction, it was thoroughly washed with n-heptane.

After completion of the reaction, it was thoroughly washed with n-heptane. 50 ml of sufficiently purified n-heptane was introduced into a flask which had been sufficiently replaced with nitrogen, and then 5 g of the solid component obtained above was introduced, and (CH ₃ ) ₃ CSi
0.8 ml of (CH ₃ ) (OCH ₃ ) ₂ was introduced, and they were contacted at 30 ° C. for 2 hours. After the contact was completed, it was thoroughly washed with n-heptane. [Polymerization of propylene] Into a stainless steel autoclave with an internal volume of 3 liters equipped with a stirrer, 1.5 liters of sufficiently purified n-heptane, 380 mg of triethylaluminum and 166 mg of diethylaluminum p-toluenesulfonate were introduced, and After introducing 20 mg of the solid catalyst component (A) produced as described above, 500 ml of hydrogen was introduced.

Then, the autoclave was heated to a temperature of 75 ° C., and propylene was pressure-supplied to a pressure of 7 kg / cm ² to start the polymerization of propylene. The pressure was maintained for 3 hours to continue the polymerization.

Then, the introduction of the monomer was stopped, the unreacted monomer was purged, and the produced polymer was separated from heptane by filtration and dried. As a result, 571 g of powdery polypropylene was obtained. When n-heptane was removed from the filtrate by heating, 1.08 g of a polymer was obtained. Therefore, the catalyst yield of this catalyst system was 28600 g-polypropylene / g-solid catalyst (g-PP / g-CAT). The melt flow rate (MFR) was 9.1 g / 10 minutes, and the bulk density of the produced polymer was 0.51 g / cm ³ . The Q value measured by GPC was 4.9, and the density of the pressed sheet was 0.9104 g / cm ³ . The Olsen flexural modulus was measured by the method of ASTM D-747-70, and 1
It was 5900 kg / cm ² . Comparative Example 1 Propylene was polymerized in the same manner as in Example 1 except that diethylaluminum p-toluenesulfonate was not used. The results obtained are as shown in Table 1. Comparative Examples 2 and 3 Polymerization of propylene was carried out in the same manner as in Example 1 except that the compounds shown in Table 1 were used as the component (C) in place of diethylaluminum p-toluenesulfonate in Example 1. . The results obtained are as shown in Table 1. Examples 2 to 4 Polymerization of propylene was carried out in the same manner as in Example 1 except that the compound shown in Table 1 was used as the component (C) in place of diethyl aluminum p-toluenesulfonate. . The results obtained are as shown in Table 1. Example 5 [Production of Propylene Block Copolymer] A stirring autoclave having an internal volume of 200 liters was sufficiently replaced with propylene, and then purified 50 liters of n-heptane, 10.5 g of toluethylaluminum and diethylaluminum p-toluenesulfonate. 4.6 g was introduced, and further 8.7 g of the solid catalyst component purified in Example 1 was introduced under a propylene atmosphere while maintaining the temperature at 60 ° C.

The pre-stage polymerization was started by heating the autoclave to 75 ° C. and then introducing propylene at a feed rate of 9.0 kg / hr while maintaining the hydrogen concentration at 2.5 vol%.

After 231 minutes, the introduction of propylene was stopped. The pressure in the autoclave at this time was 5.1 kg / cm ² G. Further, the polymerization was continued at 75 ° C. for 90 minutes. Then, the propylene in the gas phase was purged to 0.2 kg / cm ² G.

Next, after cooling the autoclave to 65 ° C., post-stage polymerization was introduced at a feed rate of 3.78 kg / hr of propylene and 2.52 kg / hr of ethylene for 31 minutes, and then the polymerization was continued for 30 minutes. The obtained slurry was filtered and dried to obtain 33.8 kg of a powdery block copolymer.

The details of the results are shown in Table 2. In the table, the weight ratio of the first-stage polymerization and the second-stage polymerization and the weight ratio of propylene and ethylene in the second-stage polymerization are calculated values on a feed basis. Comparative Example 4 A block copolymer was produced in the same manner as in Example 5, except that diethylaluminum p-toluenesulfonate was not used. As a result, the pressure in the autoclave at the end of the propylene feed in the first-stage polymerization was 5.5 kg / cm ² G, and the powdery block copolymer 3
2.6 kg were obtained. Details of the obtained results are as shown in Table 2. <Practical physical property measurement method> The following additives were added to the powdery block copolymers obtained in Example 5 and Comparative Example 4, pelletized by an extruder under the same conditions, and a thickness of 4 mm was obtained by an injection molding machine. A sheet was created and physical properties were evaluated. Additive 2,6-tert-butylphenol 0.10% by weight RA1010 (manufactured by Ciba-Geigy) 0.05% by weight Calcium stearate 0.10% by weight Physical property measurement Various physical properties were measured by the following methods.

(A) Flexural modulus: ASTM-D790 (b) Izod impact strength (0 ° C.): ASTM-D25
6 (with notch)

[0061]

[Table 1]

[0062]

[Table 2]

[0063]

EFFECT OF THE INVENTION According to the present invention, it is possible to obtain an olefin polymer having excellent moldability and high crystallinity in a high yield, as described above in the summary of the invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-2-255810 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C08F 4/60-4/70 CA (STN ) REGISTRY (STN)

Claims (2)

(57) [Claims] 1. A catalyst for olefin polymerization, which comprises a combination of the following components (A), (B) and (C). Component (A): Solid catalyst component containing titanium, magnesium, halogen and an electron donating compound as essential components Component (B): Organoaluminum compound component (C): Represented by the general formula R ¹ SO ₃ AlR ² _2. A sulfonic acid derivative compound (in the formula, R ¹ is an aromatic, cycloaliphatic, or branched aliphatic hydrocarbon group; R ² is a hydrocarbon group) 2. An olefin is brought into contact with the catalyst for olefin polymerization according to claim 1 for polymerization.
Process for producing olefin polymer.