KR101621001B1 - Catalyst composition for polymerization of olefin, preparing method of the same, and process for polymerization of olefin using the same - Google Patents

Abstract

The present invention relates to a catalyst composition comprising a fluorene-based compound as an internal electron doner for polymerizing polyolefin, a preparation method of a solid catalyst, and a preparation method of polyolefin using the same. More particularly, the catalyst composition does not include phthalate derivative which is harmful to human and environment, thereby being environment-friendly while having excellent polymerization activity. Also, the catalyst composition can prepare polyolefin having a wide molecular weight distribution and excellent melt flow properties. The catalyst composition comprises: an internal electron doner including a compound represented by chemical formula 1 and 2,2-diisopropyl-1,3-dimethoxypropane; and a transition metal compound.

Description

Technical Field The present invention relates to a catalyst composition for polyolefin polymerization, a process for producing a solid catalyst, and a process for producing a polyolefin using the catalyst composition,

The present invention relates to a catalyst composition for polyolefin polymerization, a process for producing a solid catalyst, and a process for producing a polyolefin using the same. More specifically, it relates to a catalyst composition for polyolefin polymerization, which can improve the polymerization activity of a catalyst by using an environmentally friendly internal electron donor without using a phthalate derivative harmful to humans and the environment, and to improve the physical properties of a polyolefin finally prepared, To a process for producing a catalyst, and to a process for producing a polyolefin using the same.

In the process of preparing polyolefins by polymerization or copolymerization of olefin monomers, various catalyst compounds have been used in order to obtain higher reaction efficiency and polymers having desired physical properties. Various catalysts such as a Ziegler-Natta catalyst, a Cr-based catalyst, and a metallocene catalyst are used as the catalysts used in the polyolefin polymerization, depending on the type of the central metal. These catalysts are selectively used depending on the respective production processes and application products because of their different catalytic activities, molecular weight distribution characteristics, stereoregularity and reaction characteristics with respect to the comonomers produced using the catalysts.

The catalyst for polyolefin polymerization generally referred to as a Ziegler-Natta catalyst refers to a solid catalyst comprising a combination of a main catalyst which is a main component of a transition metal compound, a promoter which is an organic metal compound, and an electron donor, And a lot of related technologies have been proposed.

The Ziegler-Natta catalyst directly affects the properties and properties of the polyolefin produced according to its constituent components, structure and preparation method. Therefore, in order to change the properties of the produced polyolefin, it is necessary to change the constituents of the catalyst, the structure of the carrier and the production method of the catalyst during the production of the catalyst. The activity of the different catalysts and the molecular weight and stereoregularity of the polymerized polymer should be studied simultaneously.

As described above, in the polyolefin polymerization, a method of using phthalate as an internal electron donor is widely known in order to lower the cost by increasing the catalytic activity and to improve the physical properties of the resulting polymer by improving the catalytic performance. However, phthalates are a type of endocrine disrupter that interferes with or disrupts the action of hormones by entering into the body of an animal or person. As a small amount, phthalates may cause human reproductive dysfunction, growth disorder, malformation, It has been found that it can have a bad influence on humans and ecosystems, and it has been banned.

Accordingly, there is a demand for the development of a Ziegler-Natta catalyst for polyolefin polymerization capable of producing a polyolefin having an environmentally friendly internal electron donor and showing a high polymerization activity, a broad molecular weight distribution, and excellent melt flowability.

The present invention provides a catalyst composition for polyolefin polymerization which exhibits a high catalytic activity, can improve the physical properties of a polymer to be produced and contains an environmentally friendly internal electron donor, a method for producing a solid catalyst, and a method for producing a polyolefin using the same .

The present invention relates to an internal electron donor comprising a compound represented by the formula (1) and a compound represented by the formula (2); And a transition metal compound. The catalyst composition for polyolefin polymerization comprises:

[Chemical Formula 1]

In Formula 1,

R ₁ and R ₂ are each independently hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, a chain or branched alkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, a cycloalkyl group having 4 to 11 carbon atoms An alkyl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, or an alkylaryl group having 7 to 20 carbon atoms,

R ₃ to R ₁₀ each independently represents a linear or branched (C 1 -C 10) alkyl group which is unsubstituted or substituted with at least one atom selected from the group consisting of hydrogen, halogen, a hetero atom group consisting of N, O, S, P, Si and halogen An alkyl group, a cycloalkyl group having 3 to 20 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and a halogen atom, An alkylaryl group having 7 to 20 carbon atoms which is unsubstituted or substituted with one or more atoms selected from the group consisting of a halogen atom, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted heteroaryl group, An arylalkyl group having 7 to 20 carbon atoms, an acyl group having 1 to 10 carbon atoms, a formyl group having 1 to 10 carbon atoms, or a nitro group,

(2)

In Formula 2,

R ₁₁ and R ₁₂ are each independently hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 20 carbon atoms,

R ₁₃ and R ₁₄ are each independently a linear or branched alkyl group having 1 to 10 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and halogen, A cycloalkyl group having 3 to 20 carbon atoms which is unsubstituted or substituted with at least one atom selected from the group consisting of N, O, S, P, Si and a heteroatom consisting of halogen, a hetero atom Substituted or unsubstituted aryl group having 6 to 20 carbon atoms, substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and halogen; Or an arylalkyl group having 7 to 20 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and a heteroatom consisting of halogen.

The present invention also provides a process for preparing a catalyst for polyolefin polymerization comprising an internal electron donor comprising a transition metal compound, a compound represented by the formula (1) and a compound represented by the formula (2).

In addition, the present invention provides a process for producing a polyolefin comprising the step of polymerizing an olefin monomer in the presence of the catalyst composition for polyolefin polymerization.

Hereinafter, a catalyst composition for polyolefin polymerization according to a specific embodiment of the present invention, a method for producing a solid catalyst, and a method for producing a polyolefin using the same will be described in detail.

According to one embodiment of the invention, the catalyst composition for polyolefin polymerization can be provided.

The present inventors have recognized the hazards and hazards of phthalate compounds which have been used as internal electron donors in the conventional polyolefin polymerization catalyst compositions for polyolefin polymerization and have conducted research on compounds that can replace them, Compounds and 1,3-diether compounds as transition metal compounds and catalysts as internal electron donors, it was confirmed that a polyolefin having an increased catalytic activity, a broad molecular weight distribution, and excellent melt flowability can be produced Thereby completing the invention.

The polyolefin polymerization means both a polymerization process using one kind of olefin monomer and a copolymerization process using two or more kinds of monomers.

According to one embodiment of the present invention, an internal electron donor comprising a compound represented by the following formula (1) and a compound represented by the following formula (2); And a transition metal compound can be provided.

[Chemical Formula 1]

In Formula 1,

R ₁ and R ₂ are each independently hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, a chain or branched alkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, a cycloalkyl group having 4 to 11 carbon atoms An alkyl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, or an alkylaryl group having 7 to 20 carbon atoms,

R ₃ to R ₁₀ each independently represents a linear or branched (C 1 -C 10) alkyl group which is unsubstituted or substituted with at least one atom selected from the group consisting of hydrogen, halogen, a hetero atom group consisting of N, O, S, P, Si and halogen An alkyl group, a cycloalkyl group having 3 to 20 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and a halogen atom, An alkylaryl group having 7 to 20 carbon atoms which is unsubstituted or substituted with one or more atoms selected from the group consisting of a halogen atom, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted heteroaryl group, An arylalkyl group having 7 to 20 carbon atoms, an acyl group having 1 to 10 carbon atoms, a formyl group having 1 to 10 carbon atoms, or a nitro group,

(2)

In Formula 2,

R ₁₁ and R ₁₂ are each independently hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 20 carbon atoms,

R ₁₃ and R ₁₄ are each independently a linear or branched alkyl group having 1 to 10 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and halogen, A cycloalkyl group having 3 to 20 carbon atoms which is unsubstituted or substituted with at least one atom selected from the group consisting of N, O, S, P, Si and a heteroatom consisting of halogen, a hetero atom Substituted or unsubstituted aryl group having 6 to 20 carbon atoms, substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and halogen; Or an arylalkyl group having 7 to 20 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and a heteroatom consisting of halogen.

In this specification, a cycloalkyl group means a monovalent functional group derived from cycloalkane, and an aryl group means a monovalent functional group derived from arene. Also, the alkylsilyl group means a silyl group substituted with an alkyl group, the arylalkyl group means an alkyl group substituted with an aryl group, and the alkylaryl group means an aryl group substituted with an alkyl group.

In the catalyst composition for polyolefin polymerization according to one embodiment, the compound represented by the formula (1) may be used as an internal electron donor to enhance the polymerization activity and improve the melt flowability of the polyolefin to be synthesized. Specifically, the compound of Formula 1 is a fluorene-based compound and has a chemical structure in which a carboxyl group is introduced at the 9-position of the fluorene compound.

More specifically, in the compound of Formula 1, a fluorene-based compound may improve stereoregularity, and a carboxyl group may be introduced into the fluorene-based compound to act as a donor which is a Lewis base . That is, the structure of the compound of Formula 1 is similar to the phthalate-based compound, so that it can exhibit the characteristics and effects of the phthalate-based donor, and is environmentally friendly because it is not harmful to the environment and human body. Accordingly, the internal electron donor including the compound of Formula 1 can increase the activity of the catalyst more effectively in the polyolefin polymerization reaction, and can produce a polyolefin having a broad molecular weight distribution and a high melt flowability.

In Formula 1, R ₁ and R ₂ may each independently be a linear or branched alkyl group having 1 to 10 carbon atoms.

Specific examples of the internal electron donor include dimethyl 9H-fluorene-9,9-dicarboxylic acid, diethyl 9H-fluorene-9,9-dicarboxylic acid, dipropyl 9H-fluorene-9,9-dicarboxylic acid , Dibutyl 9H-fluorene-9,9-dicarboxylic acid, dimethyl 1,8-dichloromethyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 1,8-dichloromethyl-9H- 9-dicarboxylic acid, dibutyl 1,8-dichloromethyl-9H-fluorene-9,9-dicarboxylic acid, dimethyl 1,8-difluoro-9H- 9,9-dicarboxylic acid, dibutyl 1,8-difluoro-9H-fluorene-9,9-dicarboxylic acid, dimethyl 2,7-diacetyl- 9H-fluorene-9,9-dicarboxylic acid, diethyl 2,7-diacetyl-9H-fluorene-9,9-dicarboxylic acid, dibutyl 2,7-diacetyl-9H- -Dicarboxylic acid, dimethyl 2-nitro-9H-fluorene-9,9-dicarboxylic acid, diethyl 2-nitro-9H-fluorene-9,9-dicarboxylic acid, dibutyl 2-nitro -9H-fluorene-9,9-dicarboxylic acid, dimethyl 2,7-dinitro-9H-fluorene-9,9-dicarboxylic acid, diethyl 2,7-dinitro-9H- -Dicarboxylic acid, dibutyl 2,7-9H-fluorene-9,9-dicarboxylic acid, dimethyl 2-tertiarybutyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 2-tertiarybutyl-9H -Fluorene-9,9-dicarboxylic acid, dibutyl 2-tertiarybutyl-9H-fluorene-9,9-dicarboxylic acid, dimethyl 2,7-diisopropyl-9H- Carboxylic acid, diethyl 2,7-diisopropyl-9H-fluorene-9,9-dicarboxylic acid, dibutyl 2,7-diisopropyl-9H-fluorene-9,9-dicarboxylic acid, -Dicyclopentyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 2,7-dicyclopentyl-9H-fluorene-9,9-dicarboxylic acid, dibutyl 2,7- -Fluorene-9,9-dicarboxylic acid, dimethyl 3,6-ditertiarybutyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 3,6-ditertiarybutyl-9H- -Dicarboxylic acid, dibutyl 3,6-di-tertiary -9H-fluorene-9,9-dicarboxylic acid, dimethyl 3-formyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 3-formyl- 9-dicarboxylic acid, dimethyl 3,6-diphosyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 3,6-diphosyl-9H-fluorene -9,9-dicarboxylic acid, dibutyl 3,6-diphosyl-9H-fluorene-9,9-dicarboxylic acid, dimethyl 3,6-phenylthio-9H- 9,9-dicarboxylic acid, dibutyl 3,6-phenylthio-9H-fluorene-9,9-dicarboxylic acid, dimethyl 4-tertiarybutyl-9H-fluorene- 9,9-dicarboxylic acid, diethyl 4-tertiarybutyl-9H-fluorene-9,9-dicarboxylic acid, dibutyl 4-tertiarybutyl-9H-fluorene- Dimethyl 2,3-benzofluorene-9,9-dicarboxylic acid, diethyl 2,3-benzofluorene-9,9-dicarboxylic acid, dibutyl 2,3-benzofluorene-9,9-dicarboxylic acid, Dimethyl 2,3,6,7-dibenzofluorene-9,9-dicarboxylate , Diethyl 2,3,6,7-dibenzofluorene-9,9-dicarboxylic acid, dibutyl 2,3,6,7-dibenzofluorene-9,9-dicarboxylic acid, dimethyl 2,3, Tetramethyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 2,3,6,7-tetramethyl-9H-fluorene-9,9-dicarboxylic acid, dibutyl 2,3, 6,7-tetramethyl-9H-fluorene-9,9-dicarboxylic acid, and the like, and one or more of them may be mixed and used as an internal electron donor.

The compound represented by Formula 2 is a 1,3-diether compound, and can be used as an internal electron donor to improve the stereoregularity of a polyolefin synthesized.

Specifically, the 1,3-diether compound of formula (2) acts as a donor and can bind to a metal compound in the catalyst to increase stereoregularity and activity, and the 1,3-diether compound The molecular weight distribution and hydrogen reactivity may be further increased. Accordingly, the internal electron donor including the compound of Formula 2 enhances the activity of the catalyst more effectively in the polyolefin polymerization reaction, and can produce a highly stereoregular polyolefin.

In the general formula (2), R ₁₁ to R ₁₂ each independently represent a linear or branched alkyl group having 1 to 10 carbon atoms.

Specific examples of the internal electron donor include 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-cyclohexyl-1,3-dimethoxypropane, 2,2- 3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, Methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl- 2-methylcyclohexyl-1,3-dimethoxypropane, 2,2-bis (p-chlorophenyl) -1,3-diethoxypropane, 2- 1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-diethoxypropane, 2,2- Diethoxypropane, 2,2-diphenyl 1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-n-butyl- Propane, 2-methyl-2-ethyl-1,3-diethoxypropane, 2-methyl- Isopropyl-2-isobutyl-1,3-dimethoxypropane, etc. Among them, one or two of them may be used. More than one species can be mixed and used as an internal electron donor.

The inner electron donor may further include a diaster compound, a benzoate compound, a succinate compound, or a silane compound in addition to the compound of Formula 1 and the compound of Formula 2.

The internal electron donor is preferably reacted in an amount of 0.05 to 1 part by weight based on 1 part by weight of the transition metal compound, more preferably 0.1 to 0.3 part by weight. If the amount of the internal electron donor is less than 0.05 part by weight based on 1 part by weight of the transition metal compound, the content of the internal electron donor may be too small and the stereoregularity may be lowered. If the amount of the internal electron donor is more than 1 part by weight,

A specific example of the method for preparing the compound represented by the formula (1) is shown in the following reaction formula (1). However, the compound of formula (1) can be obtained through various production methods, and specific examples thereof are not limited to the following reaction formula (1).

[Reaction Scheme 1]

For example, the hydrogen fluorene compound is dehydrogenated at a low temperature using lithium diisopropylamide, which is a strong base in a mixed solvent of tetrahydrofuran and hexane, and the reaction is then carried out by adding chloroformate substituted by R ¹ to obtain the compound of Formula 1 Can be synthesized. In the above Reaction Scheme 1, R ¹ may be the same or different, and the definitions of R ₁ and R ₂ in Formula 1 may be applied.

The transition metal compound means a transition metal of Group IVB, VB, or VIB or an organic compound containing such a transition metal. Specific examples of the transition metal include Ti, Zr, Hf, Rf, V, Nb , Ta, Db, Cr, Mo, W and Sg.

Specific examples of the transition metal compound may be used in the production of the catalyst component without limitation as long as it is a transition metal compound known to be used as a Ziegler-Natta catalyst for polyolefin polymerization. In particular, preferred examples of the transition metal compound include compounds represented by the following general formula (3).

(3)

MX _n (OR ¹⁵ ) _4-n

In Formula 3, M is selected from the group consisting of transition metal elements of Group IVB, VB and VIB of the periodic table, X is halogen, R ¹⁵ is an alkyl group having 1 to 10 carbon atoms, and n is 0 to 4.

Preferred examples of M include Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W and Sg. As the transition metal compound of the above formula (2), it is preferable to use zirconium (IV) chloride, chromium (III) chloride or titanium tetrachloride.

The catalyst composition for polyolefin polymerization may further comprise a support. In the catalyst composition for polyolefin polymerization, the transition metal compound and the internal electron donor may be fixed or supported on the support. The order of the transition metal compound and the internal electron donor to be supported on the support is not limited. However, it is preferable that the support and the transition metal compound are reacted first to form an active site, To enhance the catalytic activity.

There is no particular limitation on the above carrier, and it is possible to use any carrier known to be commonly used in the production of a general Ziegler-Natta catalyst. Preferably, the support is a magnesium compound, silica, alumina, zeolite, a mixture thereof, or a mixed carrier thereof, more preferably a magnesium compound. The hybrid carrier means a state in which two or more of silica, alumina, zeolite, and magnesium compounds react or bind.

Specific examples of the magnesium compound include dialkoxymagnesium, dihalogenated magnesium, alkylmagnesium halide, alkoxymagnesium halide, and aryloxymagnesium halide. When dialkoxymagnesium is used as the carrier, the activity of the catalyst and the processability of the produced polyolefin Can be further improved.

The dialkoxymagnesium is a spherical particle obtained by reacting metal magnesium with an anhydrous alcohol in the presence of a reaction initiator such as magnesium chloride and having a smooth surface, and the spherical particle shape is maintained in the polymerization of the olefin, Can be increased. The dialkoxymagnesium may have an average particle diameter of 10 to 1000 mu m, preferably 30 to 500 mu m. When the average particle diameter is less than 10 탆, the fine particles of the prepared catalyst are undesirably increased, and when the average particle diameter exceeds 1000 탆, the apparent density tends to be small.

In addition, the catalyst composition for polyolefin polymerization may further comprise a cocatalyst. The cocatalyst can reduce the transition metal compound to form an active site, thereby enhancing the catalytic activity. There are no particular restrictions on the above promoter, and any organometallic compounds known to be used in the production of a catalyst for general polyolefin polymerization can be used without limitation. Among them, it is preferable to use an alkylaluminum compound represented by the following formula (4).

[Chemical Formula 4]

R ¹⁶ _n AlX _{3 -n}

In Formula 4, R ¹⁶ is an alkyl group having 1 to 8 carbon atoms, X is halogen, and n is 0 to 3.

Specific examples of the cocatalyst include trimethylaluminum, triethylaluminum, triisobutylaluminum, tributylaluminum, diethylaluminum dichloride, ethylaluminum dichloride, ethylaluminum cesium skew chloride, tripropylaluminum, tributylaluminum, tripentylaluminum , Trihexyl aluminum, and trioctyl aluminum.

In addition, the catalyst composition for polyolefin polymerization may further include an external electron donor. In the catalyst composition for polyolefin polymerization, the transition metal compound is reduced to remove a portion of the internal electron donor, and the external electron donor binds to the vacancy to allow the polymerization reaction to proceed. Therefore, the role of the external electron donor in the catalyst composition for polyolefin polymerization is similar to that of the internal electron donor described above. That is, it can increase the activity of the catalyst more effectively in the polyolefin polymerization reaction and increase stereoregularity in the olefin polymerization.

The external electron donor may be an external electron donor commonly used in polyolefin polymerization without any particular limitation, and the internal electron donor of Formula 1 may be used as an external electron donor. Particularly, it is preferable to use a silane-based compound represented by the following formula (5).

[Chemical Formula 5]

R ¹⁷ _n Si (OR ¹⁸ ) _4-n

In Formula 5, R ¹⁷ and R ¹⁸ each independently represent hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, an amino group having 1 to 10 carbon atoms An alkyl group, and an alkoxyalkyl group having 2 to 10 carbon atoms, and n is 0 to 4.

Specific examples of the external electron donor include cyclic hexylmethyldimethoxysilane, dicyclopentyldimethoxysilane, diisopropyldimethoxysilane, vinyltriethoxysilane, triethylmethoxysilane, trimethylethoxysilane, dicyclo Ethyl trimethoxy silane, diphenyl diethoxy silane, phenyl propyl dimethoxy silane, pentyl trimethoxy silane, tertiary butyl trimethoxy silane, cyclic hexyl ethyl dimethoxy silane , Cyclic hexylmethyldimethoxysilane, cyclopentyltriethoxysilane, diisobutyldiethoxysilane, isobutyltriethoxysilane, n-propyltrimethoxysilane, isopropyltrimethoxysilane, cyclic heptylmethyldiethoxy Silane, dicycloheptyldiethoxysilane, and the like.

The external electron donor is used together with the cocatalyst during polymerization and can optionally be used as required. The concentration of the external electron donor may be 0.001 to 50 moles, preferably 0.01 to 20 moles, more preferably 0.02 to 10 moles per mole of cocatalyst. If the concentration of the external electron donor is less than 0.001 mol, the stereoregularity may be lowered, and if it exceeds 50 mol, the activity may be lowered, which is not preferable.

According to another embodiment of the present invention, there is provided a process for preparing a catalyst for polyolefin polymerization comprising reacting a transition metal compound with an internal electron donor comprising a compound represented by the formula (1) and a compound represented by the formula (2) Can be provided.

[Chemical Formula 1]

In Formula 1,

R ₁ and R ₂ are each independently hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, a chain or branched alkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, a cycloalkyl group having 4 to 11 carbon atoms An alkyl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, or an alkylaryl group having 7 to 20 carbon atoms,

R ₃ to R ₁₀ each independently represents a linear or branched (C 1 -C 10) alkyl group which is unsubstituted or substituted with at least one atom selected from the group consisting of hydrogen, halogen, a hetero atom group consisting of N, O, S, P, Si and halogen An alkyl group, a cycloalkyl group having 3 to 20 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and a halogen atom, An alkylaryl group having 7 to 20 carbon atoms which is unsubstituted or substituted with one or more atoms selected from the group consisting of a halogen atom, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted heteroaryl group, An arylalkyl group having 7 to 20 carbon atoms, an acyl group having 1 to 10 carbon atoms, a formyl group having 1 to 10 carbon atoms, or a nitro group,

(2)

In Formula 2,

R ₁₁ and R ₁₂ are each independently hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 20 carbon atoms,

R ₁₃ and R ₁₄ are each independently a linear or branched alkyl group having 1 to 10 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and halogen, A cycloalkyl group having 3 to 20 carbon atoms which is unsubstituted or substituted with at least one atom selected from the group consisting of N, O, S, P, Si and a heteroatom consisting of halogen, a hetero atom Substituted or unsubstituted aryl group having 6 to 20 carbon atoms, substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and halogen; Or an arylalkyl group having 7 to 20 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and a heteroatom consisting of halogen.

The present inventors have recognized the harmfulness and danger of the phthalate compound which has been used as an internal electron donor of the conventional catalyst composition for polyolefin polymerization and have studied about a compound which can replace the phthalate compound, , And 3-diether compounds are used together as an internal electron donor in the polyolefin polymerization catalyst, the catalyst for polyolefin polymerization containing the same exhibits increased activity, and the properties such as melt flowability and stereoregularity of the resulting polymer are improved And the invention was completed.

Specifically, the aforementioned catalyst for polyolefin polymerization can be produced by reacting the transition metal compound and the internal electron donor compound at a predetermined temperature. As described later, the reaction temperature may be gradually increased from a temperature of -50 ° C to 50 ° C in the case of fixing to a carrier to be selectively used, and the reaction at the step of reacting the transition metal compound with an internal electron donor The temperature may be above 80 < 0 > C.

The method for preparing a catalyst for polyolefin polymerization may further comprise the step of supporting the reactant on a magnesium compound, silica, alumina, zeolite, a mixture thereof, or a mixture thereof. The hybrid carrier means a state in which two or more of silica, alumina, zeolite, and magnesium compounds are reacted or bonded.

For example, the transition metal compound and the two internal electron donors may be carried on the carrier at the same time. In the step of supporting the reactants on the support, the three components Can be sequentially carried on the carrier.

The step of supporting the reactant on the support may include reacting the support and the transition metal compound, and reacting the support bearing the transition metal compound with the inner electron donor. In the step of reacting the carrier with the transition metal compound, the transition metal compound is preferably slowly added over a period of 30 minutes to 5 hours. When the carrier and the transition metal compound are first reacted and the inner electron donor is reacted, a catalyst having an active site through the reaction of the carrier and the transition metal compound is produced, and then an internal electron donor is introduced and efficiently activated An increased catalyst can be produced, and the stereoregularity of the produced polyolefin can be improved, which is preferable.

The step of reacting the carrier with the transition metal compound may be carried out at -50 to 50 ° C and preferably at -30 to 20 ° C. If the temperature is lower than -50 ° C or exceeds 50 ° C, the particle shape of the catalyst as the final product may be destroyed, which may lower the process stability in commercial production.

The step of reacting the carrier having the transition metal compound thereon with the internal electron donor is preferably performed at -20 to 150 ° C. If the temperature is lower than -20 ° C, the reaction is difficult to complete, and if it exceeds 150 ° C, the polymerization activity of the resultant catalyst or the processability of the polymer may be lowered due to side reactions, which is not preferable.

The step of reacting the carrier carrying the transition metal compound with the internal electron donor may be performed after the step of reacting the carrier and the transition metal compound, and a step of raising the temperature of the reactant may be performed between the both reaction steps Can proceed.

The inner electron donor may be heated during the step of raising the temperature of the step of reacting the carrier carrying the transition metal compound with the inner electron donor to the temperature of the step of reacting the carrier and the transition metal compound, Can be inserted afterwards. At this time, the input temperature, the number of times of application, and the application time are not limited.

The internal electron donor is preferably reacted in an amount of 0.05 to 1 part by weight based on 1 part by weight of the transition metal compound, more preferably 0.1 to 0.3 part by weight. If the amount is less than 0.05 part by weight, the internal electron donor hardly reacts with the transition metal compound, which is not preferable because it does not exhibit the effect of the internal electron donor described above, and if it exceeds 1 part by weight, the activity of the catalyst becomes low.

The transition metal compound is preferably reacted in an amount of 0.1 to 10 parts by weight based on 1 part by weight of the carrier, more preferably 3 to 8 parts by weight. If the amount is less than 0.1 part by weight, the transition metal compound is not supported smoothly on the magnesium compound. If the amount exceeds 10 parts by weight, an excessively large amount of transition metal component is present in the catalyst as compared with the carrier compound, It is not preferable.

The internal electron donor is preferably reacted in an amount of 0.1 to 1 part by weight based on 1 part by weight of the support. Outside of the above range, the polymerization activity of the produced catalyst may be lowered, or the molecular weight distribution of the polyolefin synthesized using the prepared catalyst may be narrowed, which is not preferable.

The method for preparing a catalyst for polyolefin polymerization may further comprise the step of introducing a cocatalyst containing the compound of formula (IV). The timing of introduction of the promoter is not limited, but it is preferable that the reaction product of the transition metal compound and the internal electron donor is supported on the carrier and then charged, thereby increasing the activity of the catalyst.

The method for preparing a catalyst for polyolefin polymerization may further comprise the step of injecting an external electron donor containing the compound of Formula 5. The time for introducing the external electron donor is not limited, but it is preferable that the reactant between the transition metal compound and the internal electron donor is supported on the carrier and then charged, thereby increasing the activity of the catalyst.

According to another embodiment of the present invention, there is provided a process for producing a polyolefin comprising the step of polymerizing an olefin monomer in the presence of the catalyst composition for polyolefin polymerization.

The polyolefin can be synthesized in the presence of the transition metal compound and the solid catalyst comprising the internal electron donor and the polyolefin can be synthesized in the presence of the catalyst system further comprising the cocatalyst or the external electron donor in the solid catalyst . Polyolefins synthesized using such solid catalysts or catalyst systems are environmentally friendly and improved in physical properties, since phthalates harmful to human body and environment are not used as internal electron donors in the production process and phthalate compounds are not left in the polymer.

The step of polymerizing the olefin-based monomer may be carried out in a gas phase, a liquid phase, or a solution phase. When the polymerization reaction is carried out in a liquid phase, a hydrocarbon solvent can be used, and the olefin itself can be used as a solvent.

The polymerization temperature may be from 0 to 200 캜, preferably from 30 to 150 캜. If the polymerization temperature is less than 0 占 폚, the activity of the catalyst is not good, and if it exceeds 200 占 폚, the processability is deteriorated.

The polymerization pressure can be from 1 to 100 atm and preferably from 2 to 40 atm. When the polymerization pressure exceeds 100 atmospheres, it is not preferable from the industrial and economical point of view. The polymerization reaction can be carried out by any of batch, semi-continuous and continuous processes.

The olefin-based monomer may be at least one selected from the group consisting of ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, , 1-tetradecene, 1-hexadecene, 1-aidocene, norbornene, norbornian, ethylidene norbornene, phenyl novodene, vinyl novodene, dicyclopentadiene, - pentadiene, 1,6-hexadiene, styrene, alpha-methylstyrene, divinylbenzene, 3-chloromethylstyrene, or mixtures thereof.

A heat stabilizer, a light stabilizer, a flame retardant, carbon black, a pigment, an antioxidant and the like which are conventionally added may be added to the polyolefin produced using the solid catalyst according to the present invention. The polyolefin may be mixed with linear low density polyethylene (LLDPE), high density polyethylene (HDPE), polypropylene, polybutene, EP (ethylene / propylene) rubber and the like.

According to the present invention, there is provided a catalyst composition for polyolefin polymerization comprising an environmentally friendly internal electron donor, a method for producing a solid catalyst, and a process for producing a polyolefin using the same. The catalyst for polyolefin polymerization exhibits a high catalytic activity and can produce a polyolefin which is sufficient for commercial use, has a broad molecular weight distribution and is improved in melt flowability.

The invention will be described in more detail in the following examples. However, the following examples are illustrative of the present invention, and the present invention is not limited by the following examples.

All synthetic reactions proceeded under nitrogen atmosphere, and the used tools and instruments were dried at 120 ° C for 2 hours and then dried in a nitrogen atmosphere or desiccator. All reagents used were of ACS reagent grade or higher, and the solvent was purified or anhydrous reagent was purchased and used. Further, thin film chromatography (TLC) was used to confirm the progress of the reaction, and the obtained compound was confirmed by 400 MHz NMR and GC / MSD.

[ Manufacturing example : Preparation of internal electron donor]

[ Production Example 1 ]: Diethyl  9H- Fluorene -9,9- Dicarboxylate  Produce

To 500 mL of RB was added 80 mL of tetrahydrofuran and 19.6 mL (138 mmol) of diisopropylamine in a nitrogen atmosphere, followed by cooling to -78 ° C for 10 minutes. 51 mL (129 mmol, 2.5 M in hexane) of butyllithium was slowly added thereto, followed by stirring for 20 minutes. Fluorene (10.0 g, 60.2 mmol) was added thereto and stirred for 30 minutes. 27 mL (283 mmol) of ethyl chloroformate was added slowly at the same temperature, and then 20 minutes later, the temperature was raised to room temperature and stirred for 3 hours. When the reaction was completed, water (130 mL) was added and washed with hexane (40 mL × 3). The organic layer was subjected to vacuum distillation to remove the solvent and then purified by column chromatography to obtain diethyl 9H-fluorene-9,9-carboxylate as a white solid (16.4 g, 87%).

[ Production Example 2 ]: 2,2- Diisopropyl -1,3- Dimethoxypropane

Heptane, 4,4-bis (methoxymethyl) -2,6-dimethyl (Batch No. BC00368-40-07) manufactured by Shanghai B & C Chemical Co., Ltd. was used.

[ Production Example 3 ]: Diethyl  2,3- Diisopropyl succinate  Produce

Ethyl valerate (10 g, 76.91 mmol) was slowly added to LDA (92.2 mL, 1M solution in THF / Hexane) at -78 ° C in a nitrogen atmosphere and stirred for 10 minutes. Then, trimethylsilyl chloride (10.8 mL, 84.49 mol) was slowly added thereto, followed by stirring at room temperature for two hours, and the solvent was removed under reduced pressure. Titanium tetrachloride (38.4 mL, 1M solution in DCM) was added to the new flask under a nitrogen atmosphere, the temperature was lowered again to -78 ° C, and the mixture was stirred for 10 minutes. The solvent from which the solvent was removed was added slowly and stirred at the same temperature for about 3 hours. After stirring, the mixture was diluted with 1N hydrochloric acid solution (100 mL), extracted with DCM (30 mL x 3 times), and then decompressed to remove the solvent. The resulting oil was separated into a column to give 14.2 g of diethyl 2,3-diisopropyl succinate (71%) in liquid form.

[ Example : Polyolefin  Preparation of catalyst for polymerization and Polyolefin  Synthesis of resin]

[ Example ]

1. Preparation of solid catalyst

200 mL of titanium tetrachloride was charged into a 2 L sized glass reactor equipped with a stirrer, an oil circulation heater and a cooling reflux condenser. The mixture was cooled to a low temperature of 0 ° C or lower, 20 g of diethoxy magnesium carrier was added and stirred at 300 rpm. After the addition of the carrier was completed and the low temperature was maintained for 1 hour, the temperature of the reactor was slowly raised to 100 ° C. After raising the temperature to 100 占 폚, 0.1 equivalent of diethyl 9H-fluorene-9,9-dicarboxylate of Preparation Example 1, which was vacuum-dried after synthesis, 0.1 equivalent of 2,2-diisopropyl-1,3-dimethoxypropane of Production Example 2 The internal electron donor was added and stirred at the same temperature for 1 hour, stirring was stopped and the supernatant was removed. Washed twice with 200 mL of titanium tetrachloride at the same temperature and then washed six times with 200 mL of hexane each time at 70 ° C to obtain a light brown solid catalyst which was dried under vacuum and then used.

2. Polymerization of polypropylene

First, a 2 L high-pressure reactor heated at 120 ° C was ventilated with nitrogen for 1 hour to make the state of the high-pressure reactor to a nitrogen atmosphere. The temperature of the reactor was lowered to 25 캜 in a nitrogen atmosphere, and the reactor was ventilated with propylene to maintain the reactor in a propylene atmosphere. In a reactor maintained in a propylene gas atmosphere, 2 mmol of triethylaluminum diluted with a decane solvent was added in a concentration of 1 mol, and cyclohexylmethyldimethoxysilane diluted in a decane solvent was added to an external electron donor to have a Si / Ti molar ratio of 30 Respectively. 5 mg of the solid catalyst prepared in 1 above, 1000 ml of hydrogen and 500 g of propylene were added and stirred for 5 minutes. After the polymerization, the reactor was heated to 70 ° C and polymerized at 70 ° C for 1 hour.

[ Comparative Example  One]

A solid catalyst was prepared by using 0.2 equivalent of diethyl-2,3-diisopropyl succinate synthesized in Preparation Example 3 instead of the internal electron donor of the preparation example used in the Examples, and using the same, Polypropylene was polymerized.

[ Comparative Example  2]

A solid catalyst was prepared by using 0.2 equivalents of a phthalate compound (DIBP; Aldrich) instead of the internal electron donor of the production example used in the examples, and the polypropylene was polymerized in the same manner as in the examples.

[ Experimental Example ]

1. Method for measuring catalytic activity

In the above Examples and Comparative Examples, the catalyst activity was measured by measuring the weight (Kg) of the polymer produced for 1 hour per weight (g) of the catalyst used.

 2. Measurement method of melt index

The amount of the resin extruded at 230 DEG C and 2.16 kg for 10 minutes was measured by ASTM1238.

3. Molecular weight distribution ( MWD )

2.5 mg of the sample was dissolved in 5 mL of 1,2,4-trichlorobenzene at 170 ° C. for 2 hours and then filtered using PL GPC 200 at 160 ° C. for 30 minutes using PL-Gel mixed 10 μm.

Catalytic activity
(kg-PP / g-cat) Molecular weight distribution Melt Index
(g / 10 min) Example 41 8.5 12 Comparative Example 1 40 6.3 7.1 Comparative Example 2 38 6.0 11

In the above example, a catalyst for polyolefin polymerization was prepared using an environmentally friendly fluorene internal electron donor, and the olefin was polymerized using it. Table 1 shows the polymerization activities of the polyolefin polymerization catalysts of the above examples and the catalyst activity, melt index and molecular weight distribution of the polyolefins polymerized by using the solid catalysts.

As shown in Table 1, the solid catalysts of the Examples show excellent polymerization activity over the equivalent level as compared with the solid catalysts of Comparative Examples in which the phthalate compounds were used as the internal electron donors, so that polymers can be efficiently formed in the polymerization of olefins .

Also, it was confirmed that the polyolefin prepared using the catalyst composition of the above example had a wide molecular weight distribution, and was excellent in processability and melt flowability, and that the phthalate compound harmful to humans and the environment remained, resulting in improved physical properties.

Claims (18)

An internal electron donor including a compound represented by the following formula (1) and 2,2-diisopropyl-1,3-dimethoxypropane; And a transition metal compound. The catalyst composition for polyolefin polymerization comprises:
[Chemical Formula 1]

In Formula 1,
R ₁ and R ₂ are each independently hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, a chain or branched alkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, a cycloalkyl group having 4 to 11 carbon atoms An alkyl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, or an alkylaryl group having 7 to 20 carbon atoms,
R ₃ to R ₁₀ each independently represents a linear or branched (C 1 -C 10) alkyl group which is unsubstituted or substituted with at least one atom selected from the group consisting of hydrogen, halogen, a hetero atom group consisting of N, O, S, P, Si and halogen An alkyl group, a cycloalkyl group having 3 to 20 carbon atoms which is substituted or unsubstituted with at least one atom selected from the group consisting of N, O, S, P, Si and a halogen atom, An alkylaryl group having 7 to 20 carbon atoms which is unsubstituted or substituted with one or more atoms selected from the group consisting of a halogen atom, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted heteroaryl group, An arylalkyl group having 7 to 20 carbon atoms, an acyl group having 1 to 10 carbon atoms, a formyl group having 1 to 10 carbon atoms, or a nitro group.
The method according to claim 1,
Wherein R ₁ and R ₂ in Formula 1 are each independently a linear or branched alkyl group having 1 to 10 carbon atoms.
delete The method according to claim 1,
The compound represented by the general formula (1) is preferably selected from the group consisting of dimethyl 9H-fluorene-9,9-dicarboxylic acid, diethyl 9H-fluorene-9,9-dicarboxylic acid, dipropyl 9H- Butyl 9H-fluorene-9,9-dicarboxylic acid, dimethyl 1,8-dichloromethyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 1,8-dichloromethyl-9H- Dicarboxylic acid, dibutyl 1,8-dichloromethyl-9H-fluorene-9,9-dicarboxylic acid, dimethyl 1,8-difluoro-9H-fluorene- 9-dicarboxylic acid, dibutyl 1,8-difluoro-9H-fluorene-9,9-dicarboxylic acid, dimethyl 2,7-diacetyl-9H-fluorene- 9,9-dicarboxylic acid, diethyl 2,7-diacetyl-9H-fluorene-9,9-dicarboxylic acid, dibutyl 2,7-diacetyl-9H-fluorene- 9-dicarboxylic acid, diethyl 2-nitro-9H-fluorene-9,9-dicarboxylic acid, dibutyl 2-nitro-9H- 9,9-dicarboxylic acid, diethyl 2,7-dinitro-9H-fluorene-9,9-dicarboxylic acid, dibutyl 2, 9,9-dicarboxylic acid, dimethyl 2-tertiarybutyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 2-tertiarybutyl-9H- Dicarboxylic acid, dibutyl 2-tertiarybutyl-9H-fluorene-9,9-dicarboxylic acid, dimethyl 2,7-diisopropyl-9H- 9,9-dicarboxylic acid, dibutyl 2,7-diisopropyl-9H-fluorene-9,9-dicarboxylic acid, dimethyl 2,7-dicyclopentyl-9H- 9,9-dicarboxylic acid, diethyl 2,7-dicyclopentyl-9H-fluorene-9,9-dicarboxylic acid, dibutyl 2,7-dicyclopentyl-9H- 9,9-dicarboxylic acid, diethyl 3,6-ditertiarybutyl-9H-fluorene-9,9-dicarboxylic acid, dibutyl 3, 6-ditertiarybutyl-9H-fluoro -9,9-dicarboxylic acid, dimethyl 3-formyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 3-formyl-9H-fluorene- -Fluorene-9,9-dicarboxylic acid, dimethyl 3,6-diphosyl-9H-fluorene-9,9-dicarboxylic acid, diethyl 3,6- Carboxylic acid, dibutyl 3,6-diphosyl-9H-fluorene-9,9-dicarboxylic acid, dimethyl 3,6-phenylthio-9H-fluorene-9,9-dicarboxylic acid, diethyl 3,6-phenyl 9H-fluorene-9,9-dicarboxylic acid, dibutyl 3,6-phenylthio-9H-fluorene-9,9-dicarboxylic acid, dimethyl 4-tertiarybutyl-9H- -Dicarboxylic acid, diethyl 4-tertiarybutyl-9H-fluorene-9,9-dicarboxylic acid, dibutyl 4-tertiarybutyl-9H-fluorene-9,9-dicarboxylic acid, dimethyl 2,3- 9,9-dicarboxylic acid, diethyl 2,3-benzofluorene-9,9-dicarboxylic acid, dibutyl 2,3-benzofluorene-9,9-dicarboxylic acid, dimethyl 2,3,6 , 7-dibenzofluorene-9,9-dicarboxylic acid, diethyl 2,3,6, Dibenzofluorene-9,9-dicarboxylic acid, dibutyl 2,3,6,7-dibenzofluorene-9,9-dicarboxylic acid, dimethyl 2,3,6,7-tetramethyl-9H- 9,9-dicarboxylic acid, diethyl 2,3,6,7-tetramethyl-9H-fluorene-9,9-dicarboxylic acid, and dibutyl 2,3,6,7-tetramethyl-9H -Fluorene-9,9-dicarboxylic acid. ≪ RTI ID = 0.0 > 11. < / RTI >
delete The method according to claim 1,
Wherein the transition metal compound comprises a compound represented by the following formula (3): < EMI ID =
(3)
MX _n (OR ¹⁵ ) _4-n
In Formula 3,
M is selected from the group consisting of transition metal elements of groups IVB, VB and VIB of the periodic table,
X is halogen,
R ¹⁵ is an alkyl group having 1 to 10 carbon atoms,
n is from 0 to 4;
The method according to claim 1,
At least one manganese compound selected from the group consisting of a magnesium compound, silica, alumina, zeolite, and a hybrid carrier thereof.
8. The method of claim 7,
Wherein the magnesium compound is selected from the group consisting of dialkoxymagnesium, dihalogenated magnesium, alkylmagnesium halide, alkoxymagnesium halide and aryloxymagnesium halide.
The method according to claim 1,
A catalyst composition for polyolefin polymerization further comprising a compound represented by the following formula (4) as a cocatalyst:
[Chemical Formula 4]
R ¹⁶ _n AlX _{3 -n}
In Formula 4, R ¹⁶ is an alkyl group having 1 to 8 carbon atoms, X is halogen, and n is 0 to 3.
The method according to claim 1,
A catalyst composition for polyolefin polymerization, further comprising a compound represented by the following formula (5) as an external electron donor:
[Chemical Formula 5]
R ¹⁷ _n Si (OR ¹⁸ ) _4-n
In Formula 5, R ¹⁷ and R ¹⁸ each independently represent hydrogen, a linear or branched alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, an amino group having 1 to 10 carbon atoms An alkyl group, and an alkoxyalkyl group having 2 to 10 carbon atoms, and n is 0 to 4.
delete delete delete delete delete A process for producing a polyolefin comprising the step of polymerizing an olefin monomer in the presence of the catalyst composition for polyolefin polymerization according to claim 1.
17. The method of producing a polyolefin according to claim 16, wherein the step of polymerizing the olefin-based monomer is carried out at a temperature of 25 to 200 DEG C and a pressure of 1 to 50 bar.
17. The method of claim 16,
The olefin-based monomer may be at least one selected from the group consisting of ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, , 1-tetradecene, 1-hexadecene, 1-aidocene, norbornene, norbornian, ethylidene norbornene, phenyl novodene, vinyl novodene, dicyclopentadiene, Wherein the polyolefin comprises at least one member selected from the group consisting of pentadiene, 1,6-hexadiene, styrene, alpha-methylstyrene, divinylbenzene and 3-chloromethylstyrene.