KR101864015B1 - Catalyst composition for preparing conjugated diene polymer and conjugated diene polymer prepared by using the same - Google Patents

Abstract

In the present invention, it is possible to provide a conjugated diene-based polymer which exhibits excellent catalytic activity and polymerization reactivity, including a rare earth metal compound, an alkylating agent and a halogen compound, There is provided a catalyst composition and a conjugated diene-based polymer prepared using the catalyst composition:
[Chemical Formula 1]
(X ₁ ) _a -M ₁ - ([YM ₂ - (X ₂ ) _n-1 ]) _ma
In Formula 1, a, m, n, M ₁ , M ₂ , X ₁ and X ₂ , Y are as defined in the specification.

Description

TECHNICAL FIELD [0001] The present invention relates to a conjugated diene polymer and a conjugated diene polymer prepared by using the conjugated diene polymer. [0002]

The present invention relates to a catalyst composition for preparing a conjugated diene-based polymer and a conjugated diene-based polymer prepared using the same.

As the demand for rubber compositions in various manufacturing fields such as tires, impact resistant polystyrene, shoe soles, and golf balls is gradually increasing, a conjugated diene polymer which is a synthetic rubber as a substitute material of natural rubber which is in shortage of production amount, particularly, a butadiene polymer The value is increasing.

On the other hand, the linearity and branching degree in the conjugated diene polymer greatly affect the physical properties of the polymer. Specifically, the lower the linearity or the larger the branching, the higher the dissolution rate and viscosity characteristics of the polymer, and as a result, the processability of the polymer is improved. However, if the degree of branching of the polymer is excessively large, the molecular weight distribution is widened, so that the mechanical properties of the polymer, which affects the abrasion resistance, crack resistance or rebound characteristics of the rubber composition, are rather deteriorated. In addition, the linearity and branching degree of the conjugated diene-based polymer, particularly the butadiene-based polymer, largely depend on the content of the cis 1,4-bond contained in the polymer. The higher the content of the cis 1,4-bond in the conjugated diene polymer is, the more the linearity is increased. As a result, the polymer has excellent mechanical properties and can improve the abrasion resistance, crack resistance and rebound characteristics of the rubber composition.

Accordingly, a variety of methods for preparing conjugated diene-based polymers have been developed in order to increase the linearity of cis-1,4 bonds in the conjugated diene polymer and to have appropriate processability.

Specifically, a method of producing a butadiene-based polymer by using a rare earth metal compound such as neodymium and a polymerization catalyst of a complex metal comprising an alkylating agent of Groups I to III, specifically, methylaluminoxane has been developed. However, the polymer obtained by the above method has a problem that the effect of improving the physical properties is still insufficient because the cis-1,4 bond content is not sufficiently high and the vinyl content is not sufficiently low.

Alternatively, a polymerization catalyst comprising a rare earth metal compound, an alkylating agent of Group I to Group III, and an ionic compound consisting of a non-coordinating anion and a cation is used to prepare a butadiene-based polymer having a high cis- Was developed. The above method uses Nd (OCOCCl ₃ ) ₃ as a rare earth metal compound. However, since the polymerization activity of the metal compound is low and the vinyl bond content of the butadiene polymer is large, the rubber containing the butadiene polymer produced by the above- Compared with the rubber composition containing a conventional butadiene polymer, the composition has insufficient improvement in physical properties. In addition, the butadiene polymer produced by the above method has a high vinyl bond content and a wide molecular weight distribution.

As another method, there has been developed a method for producing a butadiene polymer having a high cis-1,4 bond content by using a polymerization catalyst composed of a rare earth metal salt composed of a halogen atom-containing component and aluminoxane. However, this method also has a problem that since the specific catalyst such as neodymium salt of bis (trichloroacetic acid) (bersatanic acid) is used, the polymerization activity of the neodymium salt is low and the industrial property is low.

Accordingly, it is required to develop a method for producing a conjugated diene-based polymer capable of exhibiting excellent processability while having high linearity.

Japanese Patent Laid-Open No. 2001-048940

The first problem to be solved by the present invention is to provide a catalyst composition which is excellent in structural stability of catalytically active species and has excellent physical properties such as high linearity and narrow molecular weight distribution, and which is easy to prepare for a conjugated diene polymer .

A second problem to be solved by the present invention is to provide a conjugated diene polymer produced by using the catalyst composition and a process for producing the conjugated diene polymer.

A third problem to be solved by the present invention is to provide a rubber composition comprising a conjugated diene polymer prepared by using the catalyst composition and a tire component produced therefrom.

That is, according to one embodiment of the present invention, there is provided a catalyst composition for the production of a conjugated diene-based polymer comprising a functionalizing agent, a rare earth metal compound, an alkylating agent and a halogen compound represented by the following general formula (1)

[Chemical Formula 1]

(X ₁ ) _a -M ₁ - ([YM ₂ - (X ₂ ) _n-1 ]) _ma

In Formula 1,

m is the valence number of M ₁ , n is the valence number of M ₂ ,

a is 0? a? m-1,

M ₁ and M ₂ are each independently selected from the group consisting of Group 14 elements and Group 15 elements,

X ₁ and X ₂ are each independently selected from the group consisting of a hydrogen atom, a monovalent hydrocarbon group having 1 to 20 carbon atoms, -OR _a , -NR _b R _c , -SiR _d R _e R _f and a covalent bond functional group Wherein R _a , R _{b ,} R _c , R _d , R _e and R _f are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, An arylalkyl group having 7 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, -NR'R "and a covalent bonding functional group, and R 'and R" each independently represent a hydrogen atom, A cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms and a covalent bonding functional group,

Y is a divalent hydrocarbon group which is substituted or unsubstituted with at least one covalent functional group, provided that at least one of X ₁ , X ₂ and Y contains a covalent functional group, and

The covalent bonding functional group is a functional group containing a carbon-carbon double bond)

According to another embodiment of the present invention, there is provided a conjugated diene polymer which is prepared using the catalyst composition and has a Mooney viscosity of 10 MU to 90 MU at 100 ° C and a polydispersity of 3.4 or less.

According to another embodiment of the present invention, there is provided a method for producing a conjugated diene-based polymer comprising the step of polymerizing a conjugated diene-based monomer using the catalyst composition.

Still further, according to another embodiment of the present invention, there is provided a rubber composition comprising the conjugated diene polymer and a tire component manufactured using the rubber composition.

The catalyst composition for conjugated diene-based polymerization according to the present invention contains a functionalizing agent capable of providing a covalent bondable functional group during the production of the conjugated diene-based polymer, thereby improving the structural stability of the catalytically active species, And the polymerization reactivity can be improved. As a result, it is possible to produce a conjugated diene polymer having high linearity and excellent processability and physical properties in the production of the conjugated diene polymer.

Hereinafter, the present invention will be described in detail in order to facilitate understanding of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

As used herein, the term "preforming" means pre-polymerization in a catalyst composition for producing a conjugated diene-based polymer. Specifically, a catalyst composition for preparing a conjugated diene-based polymer containing a rare earth metal compound, an alkylating agent containing an aluminum compound, and a halogen compound is used as the above-mentioned aluminum compound, such as diisobutyl aluminum hydride (hereinafter referred to as DIBAH) , A small amount of monomers such as butadiene are included together in order to reduce the possibility of producing various catalytically active species. Thus, prior to the polymerization reaction for producing the conjugated diene-based polymer, pre-polymerization of butadiene is carried out in the catalyst composition for producing a conjugated diene-based polymer, which is referred to as prepolymerization.

The term "premixing " as used herein means that the components are homogeneously mixed without polymerization in the catalyst composition.

In addition, the term "catalyst composition" as used herein is intended to encompass chemical compounds of various composites or components caused by a simple mixture, physical or chemical attraction of the constituents.

In the present invention, when a functionalizing agent containing a covalent bonding functional group such as an allyl group in a molecule is used in the production of the catalyst composition for forming a conjugated diene polymer, the structural stability of the catalytically active species is improved, It is possible to improve the catalytic activity and reactivity of the composition and to produce a conjugated diene polymer having high linearity and excellent processability and physical properties.

Catalyst composition

The catalyst composition for conjugate diene polymerization according to an embodiment of the present invention comprises (a) a functionalizing agent, (b) a rare earth metal compound, (c) an alkylating agent, and (d) a halogen compound. Each component will be described in detail below.

(a) Functionalizing agent

In the catalyst composition for conjugate diene polymerization according to an embodiment of the present invention, the functionalizing agent includes two central elements (M ₁ and M ₂ ) linked by an intramolecular bridging group (Y) Linking functional group containing a carbon-carbon double bond. The covalent functional group is specifically a functional group containing a carbon-carbon double bond such as a vinyl group, an allyl group, a methallyl group, or a (meth) acryl group, and reacts with a neodymium compound activated by an alkylating agent in the catalyst composition Thereby stabilizing the catalytically active species and enhancing the reactivity and improving the catalytic activity. Further, by including the two central elements (M ₁ and M ₂ ) connected by the bridge group (Y), the structure stability of the catalytically active species can be further improved, and the conjugated diene polymer having excellent physical properties can be produced.

Specifically, the functionalizing agent may be a compound of formula 1:

[Chemical Formula 1]

(X ₁ ) _a -M ₁ - ([YM ₂ - (X ₂ ) _n-1 ]) _ma

In Formula 1,

m is the valence number of M ₁ , n is the valence number of M ₂ ,

a is 0? a? m-1,

M ₁ and M ₂ are each independently selected from the group consisting of Group 14 elements and Group 15 elements,

X ₁ and X ₂ are each independently selected from the group consisting of a hydrogen atom, a monovalent hydrocarbon group having 1 to 20 carbon atoms, -OR _a , -NR _b R _c , -SiR _d R _e R _f and a covalent bond functional group Wherein R _a , R _{b ,} R _c , R _d , R _e and R _f are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, An arylalkyl group having 7 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, -NR'R "and a covalent bonding functional group, and R 'and R" each independently represent a hydrogen atom, A cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms and a covalent bonding functional group,

Y is a divalent hydrocarbon group which is substituted or unsubstituted with at least one covalent functional group, provided that at least one of X ₁ , X ₂ and Y contains a covalent functional group, and

The covalent functional group is a functional group containing a carbon-carbon double bond.

In formula (1), when a > 1, a plurality of X < ₁ > may be the same or different. Similarly, a plurality of - ([YM ₂ - (X ₂ ) _n-1 ] in case of ma> 1 in the above formula 1 and a plurality of X ₂ in the case of n-1> 1 in the above formula 1 are the same or different .

Specifically, in Formula 1, M ₁ and M ₂ may each independently be selected from the group consisting of Si, Sn, and N. Accordingly, when the above M ₁ and M ₂ Si or Sn, is the valence number (m) and the valence number (n) of M ₂ a M ₁ is a 4, respectively, M ₁ and M ₂ is N, the valence of M ₁ The number (m) and valence number (n) of M ₂ are each 3.

In Formula 1, X ₁ and X ₂ each independently represent a hydrogen atom, a monovalent hydrocarbon group having 1 to 20 carbon atoms, -OR _a , -NR _b R _c , -SiR _d R _e R _f, A functional group, and a functional group. Wherein R _a , R _{b ,} R _c , R _d , R _e and R _f each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, An arylalkyl group having 7 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, -NR'R "and a covalent bonding functional group, and R 'and R" each independently represent a hydrogen atom, A cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, and a covalent bonding functional group.

Here, the monovalent hydrocarbon group is specifically a linear or branched alkyl group having 1 to 20 carbon atoms such as a methyl group, an ethyl group or a propyl group; A cycloalkyl group having 3 to 20 carbon atoms such as a cyclopropyl group, a cyclobutyl group or a cyclopentyl group; An aryl group having 6 to 20 carbon atoms such as a phenyl group and the like; An arylalkyl group having 7 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, and the like.

The covalent bonding functional group may be an alkenyl group or a (meth) acryl group, and the alkenyl group is specifically an alkenyl group having 2 to 20 carbon atoms, more specifically an alkenyl group having 2 to 12 carbon atoms, Or an alkenyl group having 2 to 6 carbon atoms. More specifically, the covalent bonding functional group may be selected from the group consisting of a vinyl group, an allyl group, a methallyl group, a butenyl group, a pentenyl group, a hexenyl group, and a (meth) In view of the remarkable improvement effect of the catalytic activity and the polymerization reactivity when applied, the covalent functional group may be an allyl group. In the present invention, (meth) acrylic group means acryl and methacryl.

In Formula 1, X ₁ and X ₂ are each independently selected from the group consisting of a linear or branched alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms. Or more of the above substituents.

More specifically, X ₁ and X ₂ each independently represent a hydrogen atom, an alkyl group, a vinyl group, an alkoxy group, an allyl group, a methallyl group, a (meth) acryl group, an amino group (-NH ₂ ) , An alkylarylamino group, a silyl group (-SiH ₃ ), an alkylsilyl group, a dialkylsilyl group, a trialkylsilyl group, an allylsilyl group, a diallylsilyl group, an alkylallylsilyl group, (Diallylamino) silyl group, (dialylamino) silyl group, (diallylamino) silyl group, (diallylamino) alkylsilyl group, Wherein the alkyl group may be a linear or branched alkyl group having 1 to 20 carbon atoms, more specifically a linear or branched alkyl group having 1 to 6 carbon atoms, and the alkoxy group may be a straight or branched An alkoxy group, more specifically, Or a straight or branched alkoxy group having 1 to 6 carbon atoms.

In Formula 1, Y may specifically be an alkylene group or an alkylene group in which at least one hydrogen atom in the molecule is substituted with a covalent bond functional group, wherein the covalent bond functional group is as defined above, The ring may be an alkylene group having 1 to 20 carbon atoms, more specifically an alkylene group having 1 to 8 carbon atoms. The Y may further be substituted with at least one substituent selected from the group consisting of a linear or branched alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 30 carbon atoms.

More specifically, the functionalizing agent may be selected from the group consisting of compounds of the following formulas (2a) to (2g):

In the above formulas (2a) to (2g), nBu means an n-butyl group and TMS means a trimethylsilyl group.

More specifically, the functionalizing agent is a divalent hydrocarbon having m and n in the general formula (1), an integer of 3 each, M ₁ and M ₂ are each nitrogen (N), Y is a covalent functional group substituted by 1 or more / RTI > Here, the covalent bonding functional group and the divalent hydrocarbon group are as defined above. More specifically, the functionalizing agent may include, in addition to the above conditions, X ₁ and X ₂ each independently represent a monovalent hydrocarbon group having 1 to 20 carbon atoms or a compound represented by -SiR _d R _e R _f , Specifically, X ₁ and X ₂ may each independently comprise a compound of -SiR _d R _e R _f . Wherein R _d, R _e , and R _f are the same as defined above, and more specifically, each independently may be an alkyl group having 1 to 6 carbon atoms.

In the above-mentioned functionalizing agent, M ₁ and M ₂ are each selected from the group consisting of Si, Sn and N in the above formula (1), but when M ₁ and M ₂ are not simultaneously N and Y is a covalent functional group X ₁ and X ₂ are each independently a monovalent hydrocarbon group having 1 to 20 carbon atoms or a covalent bonding functional group, at least one of X ₁ and X ₂ is a covalent bond functional group ≪ / RTI > The monovalent and divalent hydrocarbon groups and the covalent bonding functional groups are as described above.

The functionalizing agent of the above formula (1) may be used by using a conventional synthesis reaction. For example, the functionalizing agent of Formula 1 may be prepared by the reaction shown in Reaction Scheme 1 below. The following Reaction Scheme 1 is only one example for illustrating the present invention, but the present invention is not limited thereto.

[Reaction Scheme 1]

(b) a rare earth metal compound

In the catalyst composition for conjugated diene polymerization according to an embodiment of the present invention, the rare earth metal compound is activated by an alkylating agent and then reacted with a reactive group of the functionalizing agent to form a catalytically active species for polymerization of the conjugated diene .

The rare earth metal compound is not particularly limited as long as it is used in the production of a conjugated diene polymer. Specifically, the rare earth metal compound may be any one or two or more of rare earth metals having atomic numbers of 57 to 71, such as lanthanum, neodymium, cerium, gadolinium, praseodymium and the like, and more specifically, neodymium, lanthanum and gadolinium Or a compound comprising at least two members selected from the group consisting of:

The rare earth metal compound may be at least one selected from the group consisting of rare earth metal-containing carboxylates (for example, neodymium acetate, neodymium acrylate, neodymium methacrylate, neodymium acetate, neodymium gluconate, neodymium citrate, neodymium fumarate, neodymium lactate, (For example, neodymium dibutyl phosphate, neodymium dipentyl phosphate, neodymium dihexyl phosphate, neodymium diheptyl phosphate, and the like) , Neodymium dioctylphosphate, neodymium dioctylphosphate, neodymium bis (1-methylheptyl) phosphate, neodymium bis (2-ethylhexyl) phosphate or neodymdidecylphosphate), organic phosphonates Pentylphosphonate, neodymium hexylphosphonate, neodymium heptylphosphonate, Neodymium dodecylphosphonate, neodymium dodecylphosphonate or neodymium octadecylphosphonate, and the like), a metal salt such as neodymium octylphosphonate, neodymium (1-methylheptyl) phosphonate, neodymium (2-ethylhexyl) Organic phosphoric acid salts such as neodymium butylphosphinate, neodymium pentylphosphinate, neodymium hexylphosphinate, neodymium heptylphosphinate, neodymium octylphosphinate, neodymium (1-methylheptyl) phosphinate or Neodymium diethylcarbamate, neodymium diisopropylcarbamate, neodymium dibutylcarbamate, or neodymium (2-ethylhexyl) phosphite) Dibenzylcarbamate, and the like), dithiocarbamates (e.g., neodymium dimethyldithiocarbamate, neodymium diethyldithiocarbamate, neodymium di (For example, neodymium methyl xanthate, neodymium ethyl xanthate, neodymium isopropyl xanthenate, neodymium dibutyl dithiocarbamate, etc.), xanthate (For example, neodymium acetylacetonate, neodymium trifluoroacetylacetonate, neodymium hexafluoroacetylacetonate, neodymium benzoyl acetoacetate, or neodymium benzoyl acetoacetate) (Neodymium methoxide, neodymium ethoxide, neodymium isopropoxide, neodymium phenoxide or neodymium nonylphenoxide, etc.), halides or pseudohalides (neodymium fluoride, neodymium bromide, etc.), alkoxides or allyl oxides Neodymium chloride, neodymium bromide, neodymium iodide, neodymium (E.g., neodymium oxyfluoride, neodymium oxychloride, or neodymium oxybromide), or at least one rare earth metal-carbon bond (such as cyanide, neodymium cyanate, neodymium thiocyanate, or neodymium azide) (C ₅ Me ₅ ) ₂ LnR, LnR ₃ , Ln (allyl), an organic rare earth metal compound (for example, Cp ₃ Ln, Cp ₂ LnR, Cp ₂ LnCl, CpLnCl ₂ , CpLn (cyclooctatetraene) ) ₃ , or Ln (allyl) ₂ Cl, where Ln is a rare earth metal element and R is a hydrocarbyl group as defined above), and mixtures of any two or more thereof have.

More specifically, the rare earth metal compound may be a neodymium compound of the following formula (3): < EMI ID =

(3)

In Formula 3, R ₁ to R ₃ are each independently a hydrogen atom or a linear or branched alkyl group having 1 to 12 carbon atoms.

More specifically, the rare earth metal compound is a R ₁ is a linear or branched alkyl group having 6 to 12 carbon atoms in the formula 3, R ₂ and R ₃ each independently is a hydrogen atom, or a linear or branched group having 2 to 6 carbon atoms Alkyl group, provided that R ₂ and R ₃ are not hydrogen atoms at the same time. More specifically, in Formula 3, R ₁ is a linear or branched alkyl group having 6 to 8 carbon atoms, and R ₂ and R ₃ are And each may be a neodymium compound which is a linear or branched alkyl group having 2 to 6 carbon atoms.

When the neodymium compound of Formula 3 includes a carboxylate ligand having a variable length alkyl group having a carbon number of 2 or more at the? -Position, a stereoscopic change around the neodymium center metal is induced to prevent entrainment of the compounds And as a result, the oligomerization is inhibited and the conversion rate to the active species is high. Such neodymium compounds are highly soluble in polymerization solvents.

More specifically, the rare earth metal compound Nd (2,2- diethyl decanoate) _3, Nd (2,2- dipropyl decanoate) _3, Nd (2,2- di-butyl decanoate) ₃ , Nd (2,2- di-hexyl decanoate) _3, Nd (2,2- dioctyl decanoate) _3, Nd (2- ethyl-2-propyl decanoate) _3, Nd (2- ethyl- 2-butyl decanoate) _3, Nd (2-ethyl-2-hexyl decanoate) _3, Nd (2-propyl-2-butyl decanoate) _3, Nd (2-propyl-2-hexyl to Kano Eight) _3, Nd (2- propyl-2-isopropyl decanoate) _3, Nd (2- butyl-2-hexyl decanoate) _3, Nd (2- cyclohexyl-2-octyl decanoate) _3, Nd (2-t- butyl decanoate) _3, Nd (2,2- diethyl octanoate) _3, Nd (2,2- dipropyl octanoate) _3, Nd (2,2- dibutyl-octahydro Eight furnace) _3, Nd (2,2- dihexyl octanoate) _3, Nd (2- ethyl-2-propyl-octanoate) _3, Nd (2- ethyl-hexyl-2-octanoate) _3, Nd (titeu to 2,2-diethyl-no nano) _3, Nd (2,2- No nano-propyl benzoate) _3, Nd (2,2- dibutyl no nano-benzoate) _3, Nd (2,2- dihexyl no nano-benzoate) _3, Nd (2- ethyl-2-propyl-no nano-benzoate) ₃ and Nd (2-ethyl-2-hexylnonanoate) ₃ , or a mixture of two or more thereof. Considering the excellent solubility in a polymerization solvent, the conversion to a catalytically active species, and the effect of improving catalytic activity thereby, without concern for oligomerization, the neodymium compound is preferably Nd (2,2-diethyl decanoate) _3, Nd (2,2- dipropyl decanoate) _3, Nd (2,2- di-butyl decanoate) _3, Nd (2,2- di-hexyl decanoate) _3, and Nd (2,2 -Dioctyl decanoate) ₃ , or a mixture of two or more thereof.

The rare earth metal compound may have a solubility of about 4 g or more per 6 g of non-polar solvent at room temperature (23 ± 5 ° C). In the present invention, the solubility of the neodymium compound means a degree of dissolution without cloudiness. By exhibiting such high solubility, excellent catalytic activity can be exhibited.

(c) an alkylating agent

In the catalyst composition for conjugated diene polymerization according to an embodiment of the present invention, the alkylating agent is an organometallic compound capable of transferring a hydrocarbyl group to another metal, and serves as a cocatalyst. The alkylating agent is not particularly limited as long as it is used as an alkylating agent in the production of a diene-based polymer.

Specifically, the alkylating agent is an organic metal compound or a boron-containing compound soluble in a non-polar solvent, specifically, a non-polar hydrocarbon solvent and containing a cationic metal such as a Group 1, Group 2 or Group 3 metal, . More specifically, the alkylating agent may be any one or a mixture of two or more selected from the group consisting of an organoaluminum compound, an organomagnesium compound, and an organolithium compound.

In the alkylating agent, the organoaluminum compound may specifically be a compound represented by the following formula (4): < EMI ID =

[Chemical Formula 4]

Al (R) _z (X) _{3- z}

In Formula 4,

R is independently a monovalent organic group which is bonded to an aluminum atom through a carbon atom, and is an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms A hydrocarbyl group such as an alkenyl group, an aryl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, an allyl group or an alkynyl group having 2 to 32 carbon atoms; Or a heterohydrocarbyl group containing at least one hetero atom selected from the group consisting of a nitrogen atom, an oxygen atom, a boron atom, a silicon atom, a sulfur atom, and a phosphorus atom in place of carbon in the hydrocarbyl group structure,

X is independently selected from the group consisting of a hydrogen atom, a halogen group, a carboxyl group, an alkoxy group, and an aryloxy group,

and z is an integer of 1 to 3.

More specifically, the organoaluminum compound is selected from the group consisting of diethylaluminum hydride, di-n-propylaluminum hydride, diisopropylaluminum hydride, di-n-butylaluminum hydride, diisobutylaluminum hydride (DIBAH) Di-n-octylaluminum hydride, diphenylaluminum hydride, di-p-tolylaluminum hydride, dibenzylaluminum hydride, phenylethylaluminum hydride, phenyl-n-propylaluminum hydride, N-butyl aluminum hydride, phenyl isobutyl aluminum hydride, phenyl-n-octyl aluminum hydride, p-tolyl ethyl aluminum hydride, p-tolyl-n-propyl aluminum hydride, p- Propyl aluminum hydride, p-tolyl-n-butyl aluminum hydride, p-tolyl isobutyl Aluminum hydride, p-tolyl-n-octylaluminum hydride, benzylethylaluminum hydride, benzyl-n-propylaluminum hydride, benzylisopropylaluminum hydride, benzyl-n-butylaluminum hydride, benzylisobutylaluminum Dihydrocarbylaluminum hydride such as hydride or benzyl-n-octylaluminum hydride; Hydrocarbylaluminum such as ethylaluminum dihydride, n-propylaluminum dihydride, isopropylaluminum dihydride, n-butylaluminum dihydride, isobutylaluminum dihydride or n-octylaluminum dihydride, Dihydride and the like.

The organoaluminum compound may be aluminoxane.

The aluminoxane may be prepared by reacting a trihydrocarbyl aluminum compound with water, specifically, a linear aluminoxane of the following formula (5a) or a cyclic aluminoxane of the following formula (5b): < EMI ID =

[Chemical Formula 5a]

[Chemical Formula 5b]

In the general formulas (5a) and (5b), R is a monovalent organic group bonded to an aluminum atom through a carbon atom, which is the same as R defined above, and x and y are each independently an integer of 1 or more, Specifically, it may be an integer of 2 to 50.

More specifically, the aluminoxane may be at least one selected from the group consisting of methyl aluminoxane (MAO), modified methyl aluminoxane (MMAO), ethyl aluminoxane, n-propyl aluminoxane, isopropyl aluminoxane, butyl aluminoxane, Aluminoxane, neopentylaluminoxane, n-hexylaluminoxane, n-octylaluminoxane, 2-ethylhexylaluminoxane, cyclohexylaluminoxane, 1-methylcyclopentylaluminoxane, phenylaluminoxane or 2,6-dimethylphenyl Aluminoxane, and the like, and any one or a mixture of two or more of them may be used.

In the aluminoxane compound, the modified methylaluminoxane is obtained by replacing the methyl group of methylaluminoxane with a silyl group (R), specifically a hydrocarbon group having 2 to 20 carbon atoms, specifically, a compound represented by the following formula have:

[Chemical Formula 6]

In Formula 6, R is the same as defined above, and m and n each may be an integer of 2 or more. In the above formula (2), Me represents a methyl group.

More specifically, in Formula 6, R is a linear or branched alkyl group having 2 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, a cycloalkenyl group having 3 to 20 carbon atoms, An arylalkyl group having 7 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, an allyl group, or an alkynyl group having 2 to 20 carbon atoms, and more specifically, an ethyl group, an isobutyl group, a hexyl group, A linear or branched alkyl group having from 2 to 10 carbon atoms such as a methyl group, an ethyl group, a t-butyl group and the like, and more specifically an isobutyl group.

More specifically, the modified methylaluminoxane may be obtained by replacing about 50% to 90% by mole of the methyl group of methylaluminoxane with the hydrocarbon group described above. When the content of the substituted hydrocarbon group in the modified methylaluminoxane is within the above range, the alkylation can be promoted to increase the catalytic activity.

Such modified methylaluminoxane can be prepared by a conventional method, and specifically, it can be produced using alkylaluminum other than trimethylaluminum and trimethylaluminum. The alkylaluminum may be triisobutylaluminum, triethylaluminum, trihexylaluminum or trioctylaluminum, and any one or a mixture of two or more thereof may be used.

On the other hand, the organomagnesium compound as the alkylating agent is a magnesium compound which contains at least one magnesium-carbon bond and is soluble in a non-polar solvent, specifically, a non-polar hydrocarbon solvent. Specifically, the organomagnesium compound may be a compound of formula (7a): < EMI ID =

[Formula 7a]

Mg (R) ₂

In Formula (7a), each R is independently a monovalent organic group and is the same as R defined above.

More specifically, the organomagnesium compound of Formula 7a may be an alkylmagnesium compound such as diethylmagnesium, di-n-propylmagnesium, diisopropylmagnesium, dibutylmagnesium, dihexylmagnesium, diphenylmagnesium or dibenzylmagnesium, .

In addition, the organomagnesium compound may be a compound of the following formula (7b): < EMI ID =

[Formula 7b]

RMgX

In Formula 7b, R is a monovalent organic group and is the same as R defined above, and X is selected from the group consisting of a hydrogen atom, a halogen group, a carboxyl group, an alkoxy group, and an aryloxy group.

More specifically, the organomagnesium compound of Formula 7b may be a hydrocarbyl magnesium hydride such as methylmagnesium hydride, ethylmagnesium hydride, butylmagnesium hydride, hexylmagnesium hydride, phenylmagnesium hydride, or benzylmagnesium hydride; There may be mentioned methylmagnesium chloride, ethylmagnesium chloride, butylmagnesium chloride, hexylmagnesium chloride, phenylmagnesium chloride, benzylmagnesium chloride, methylmagnesium bromide, ethylmagnesium bromide, butylmagnesium bromide, hexylmagnesium bromide, phenylmagnesium bromide, Hydrocarbyl magnesium halides such as magnesium bromide and the like; Hydrocarbyl magnesium carboxylates such as methyl magnesium hexanoate, ethyl magnesium hexanoate, butyl magnesium hexanoate, hexyl magnesium hexanoate, phenyl magnesium hexanoate and benzyl magnesium hexanoate; Hydrocarbyl magnesium alkoxides such as methyl magnesium ethoxide, ethyl magnesium ethoxide, butyl magnesium ethoxide, hexyl magnesium ethoxide, phenyl magnesium ethoxide and benzyl magnesium ethoxide; Or hydrocarbyl magnesium aryloxides such as methyl magnesium phenoxide, ethyl magnesium phenoxide, butyl magnesium phenoxide, hexyl magnesium phenoxide, phenyl magnesium phenoxide, benzyl magnesium phenoxide and the like.

As the organic lithium compound as the alkylating agent, alkyl lithium of R-Li (wherein R is a linear or branched alkyl group having 1 to 20 carbon atoms, more specifically a linear alkyl group having 1 to 8 carbon atoms) may be used. More specifically, there may be mentioned methyllithium, ethyllithium, isopropyllithium, n-butyllithium, sec-butyllithium, t-butyllithium, isobutyllithium, pentyllithium, isopentyllithium, Two or more mixtures may be used.

Among the above-mentioned compounds, the alkylating agent usable in the present invention may specifically be DIBAH which can act as a molecular weight regulator during polymerization.

In addition, the alkylating agent may be modified methyl aluminoxane in that the solvent system used in the preparation of the catalyst composition may be an aliphatic hydrocarbon-based single-homogeneous solvent to further improve catalytic activity and reactivity.

(d) Halogen compound

In the catalyst composition for conjugate diene polymerization according to an embodiment of the present invention, the kind of the halogen compound is not particularly limited, but can be used without particular limitation, as long as it is used as a halogenating agent in the production of a diene polymer.

Specifically, examples of the halogen compound include a halogen alone, an interhalogen compound, a hydrogen halide, an organic halide, a non-metal halide, a metal halide, or an organic metal halide, The above mixture may be used. Among them, one or a mixture of two or more selected from the group consisting of an organic halide, a metal halide, and an organometallic halide may be used as the halogen compound, considering that the catalytic activity is improved and the reactivity is improved.

More specifically, examples of the halogen group include fluorine, chlorine, bromine and iodine.

Specific examples of the interhalogen compound include iodine monochloride, iodine monobromide, iodine trichloride, iodopentafluoride, iodine monofluoride, iodotrifluoride, and the like.

Examples of the hydrogen halide include hydrogen fluoride, hydrogen chloride, hydrogen bromide, and hydrogen iodide.

Specific examples of the organic halide include t-butyl chloride (t-BuCl), t-butyl bromide, allyl chloride, allyl bromide, benzyl chloride, benzyl bromide, chlorodi-phenyl methane, bromo- , Triphenylmethyl chloride, triphenylmethyl bromide, benzylidene chloride, benzylidene bromide, methyltrichlorosilane, phenyltrichlorosilane, dimethyldichlorosilane, diphenyldichlorosilane, trimethylchlorosilane (TMSCl), benzoyl chloride, benzoyl bromide , Propionyl chloride, propionyl bromide, methyl chloroformate, methyl bromoformate, iodomethane, diiodomethane, triiodomethane (also referred to as iodoform), tetraiodomethane, 1 - iodopropane, 2-iodopropane, 1,3-diiodopropane, t-butyliodide, 2,2-dimethyl-1-iodopropane (Also referred to as " pentyl iodide "), allyl iodide, iodobenzene, benzyl iodide, diphenylmethyl iodide, triphenylmethyl iodide, benzylidene iodide Triethylsilyl iodide, trimethylsilyl iodide, triphenylsilyl iodide, dimethyldiiodosilane, diethyldiiodosilane, diphenyldiiodosilane, methyltriiodosilane, ethyl Triiodosilane, phenyltriiodosilane, benzoyl iodide, propionyl iodide or methyl iodoformate, and the like.

Further, as the non-metal halides specifically include phosphorus trichloride, phosphorus tribromide, phosphorus pentachloride, phosphorus oxychloride, oxy-bromide, phosphorus, boron trifluoride, boron trichloride, boron tribromide, used silicon tetrafluoride, silicon tetrachloride (SiCl _4), four There may be mentioned silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, silicon carbide, Selenium and the like.

Specific examples of the metal halide include tin tetrachloride, tin tetrabromide, aluminum trichloride, aluminum tribromide, antimony trichloride, antimony trichloride, antimony tribromide, aluminum trifluoride, gallium trichloride, gallium tribromide, A metal oxide such as indium, tin bromide, indium trifluoride, titanium tetrachloride, titanium tetrabromide, zinc dichloride, zinc bromide, zinc fluoride, aluminum triiodide, gallium triiodide, indium triiodide, titaniumiodide, zinc iodide, Germanium tetraiodide, tungsten iodide, antimony triiodide, or magnesium iodide.

Specific examples of the organometallic halide include dimethylaluminum chloride, diethylaluminum chloride, dimethylaluminum bromide, diethylaluminum bromide, dimethylaluminum fluoride, diethylaluminum fluoride, methylaluminum dichloride, ethylaluminum dichloride, methyl (EASC), isobutylaluminum sesquichloride, methylmagnesium chloride, methylmagnesium bromide, ethylmagnesium bromide, ethylmagnesium bromide, ethylmagnesium bromide, ethylmagnesium bromide, , Ethylmagnesium chloride, ethylmagnesium bromide, n-butylmagnesium chloride, n-butylmagnesium bromide, phenylmagnesium chloride, phenylmagnesium bromide, benzylmagnesium Butyl tin dichloride, di-t-butyl tin dibromide, di-n-butyl tin dichloride, di-n-butyl tin dichloride, n-butyltin chloride, tri-n-butyltinbromide, methylmagnesium iodide, dimethyl aluminum iodide, diethyl aluminum iodide, di-n-butyl aluminum iodide Diisobutyl aluminum iodide, di-n-octyl aluminum iodide, methyl aluminum diiodide, ethyl aluminum diiodide, n-butyl aluminum diiodide, isobutyl aluminum diiodide, methyl aluminum sesiodide Quaternary ammonium salts such as quaternary ammonium salts, quaternary ammonium salts, quaternary ammonium salts, quaternary ammonium salts, quaternary ammonium salts, quaternary ammonium salts, quaternary ammonium salts, N-butyl iodide, tri-n-butyl tin iodide, di-n-butyl iodide, isobutylmagnesium iodide, phenylmagnesium iodide, benzylmagnesium iodide, trimethyltin iodide, Tin diiodide or di-t-butyltin diiodide, and the like.

In addition, the catalyst composition for preparing a conjugated diene polymer according to an embodiment of the present invention may contain a non-coordinating anion-containing compound or a non-coordinating anion precursor compound instead of or in addition to the halogen compound.

Specifically, in the compound containing the non-coordinating anion, the non-coordinating anion is a sterically bulky anion which does not form a coordination bond with the active center of the catalyst system due to steric hindrance, and is a tetraaryl borate anion or tetraaryl fluoride Borate anions, and the like. In addition, the compound containing the non-coordinating anion may include a carbonium cation such as a triarylcarbonium cation together with the above-mentioned non-coordinating anion; An ammonium cation such as N, N-dialkyl anilinium cation or the like, or a relative cation such as a phosphonium cation. More specifically, the compound comprising the non-coordinating anion is selected from the group consisting of triphenylcarbonium tetrakis (pentafluorophenyl) borate, N, N-dimethylanilinium tetrakis (pentafluorophenyl) borate, triphenylcarboniumtetra 3,5-bis (trifluoromethyl) phenyl] borate, or N, N-dimethylanilinium tetrakis [3,5-bis (trifluoromethyl) phenyl] borate.

Examples of the non-coordination anion precursor include triarylboron compounds (BR ₃ , wherein R is a pentafluorophenyl group or a 3,5-bis (trifluoromethyl) phenyl group and the like, which is capable of forming a non- And a strong electron withdrawing aryl group.

The catalyst composition for forming a conjugated diene polymer according to an embodiment of the present invention may further include a diene monomer in addition to the above components.

The diene-based monomer may be mixed with a polymerization catalyst to form a premixing catalyst, or may be prepared by polymerization with components in a polymerization catalyst, specifically an alkylating agent such as DIBAH, to form a preforming catalyst . When the prepolymerization is performed in this manner, the activity of the catalyst can be improved, and the conjugated diene-based polymer to be produced can be further stabilized.

Specifically, the diene-based monomer can be used without particular limitation, as long as it is usually used in the production of a conjugated diene-based polymer. Specifically, the diene monomer may be at least one monomer selected from the group consisting of 1,3-butadiene, isoprene, 1,3-pentadiene, 1,3-hexadiene, 2,3-dimethyl-1,3-butadiene, Methyl-1,3-pentadiene, 4-methyl-1,3-pentadiene, and 2,4-hexadiene. Of these, One or a mixture of two or more may be used.

The catalyst composition for forming a conjugated diene-based polymer according to an embodiment of the present invention may further include a reaction solvent in addition to the above components.

The reaction solvent may specifically be a nonpolar solvent which is not reactive with the catalyst components described above. Specific examples include n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, isopentane, isohexane, isopentane, isooctane, 2,2-dimethylbutane, cyclopentane, , Methylcyclopentane or methylcyclohexane, and the like; alicyclic hydrocarbons having 5 to 20 carbon atoms in a linear, branched, or cyclic form; A mixed solvent of aliphatic hydrocarbons having 5 to 20 carbon atoms such as petroleum ether or petroleum spirits, or kerosene; Or an aromatic hydrocarbon solvent such as benzene, toluene, ethylbenzene, xylene, etc., and any one or a mixture of two or more of them may be used. More specifically, the non-polar solvent may be any of the above-described linear, branched or cyclic aliphatic hydrocarbons or aliphatic hydrocarbons of 5 to 20 carbon atoms, more specifically, n-hexane, cyclohexane, .

In addition, the reaction solvent may be appropriately selected depending on the constituent material constituting the catalyst composition, in particular, the kind of the alkylating agent.

Specifically, in the case of alkylaluminoxanes such as methylaluminoxane (MAO) or ethylaluminoxane as an alkylating agent, an aromatic hydrocarbon solvent can be suitably used because it is not easily dissolved in an aliphatic hydrocarbon-based solvent.

When modified methylaluminoxane is used as the alkylating agent, an aliphatic hydrocarbon-based solvent may be suitably used. In this case, a single solvent system can be realized together with an aliphatic hydrocarbon-based solvent such as hexane, which is mainly used as a polymerization solvent, so that the polymerization reaction can be more advantageous. Further, the aliphatic hydrocarbon-based solvent can promote the catalytic activity, and the reactivity can be further improved by the catalytic activity.

The constituents in the catalyst composition as described above form catalytically active species through interactions with each other. Accordingly, the catalyst composition according to one embodiment of the present invention can optimally combine the contents of the above components so as to exhibit higher catalytic activity and better polymerization reactivity in the polymerization reaction for forming the conjugated diene polymer .

Specifically, the catalyst composition may be contained in an amount of 20 equivalents or less, more specifically 0.0001 to 20 equivalents, per equivalent of the rare earth metal compound. If the content of the functionalizing agent exceeds 20 equivalents, unreacted functional vaporizing agent may remain and cause side reactions. More specifically, the functionalizing agent may be contained in an amount of 1 to 10 equivalents based on 1 equivalent of the rare earth metal compound.

When the amount of the alkylating agent is less than 5 mol, the activating effect on the rare earth metal compound is insufficient. When the amount of the alkylating agent is more than 200 mol, It is not easy to control the catalytic reaction, and there is a possibility that an excessive amount of the alkylating agent causes a side reaction. More specifically, the catalyst composition may contain 5 to 20 moles of the above alkylating agent per mole of the rare earth metal compound, and may include 5 to 10 moles, considering the remarkable improvement in processability.

The catalyst composition may contain 1 to 20 moles of the above-described halogen compound per mole of the rare earth metal compound, more specifically 2 to 6 moles. When the content of the halogen compound is less than 1 mol, the formation of the catalytically active species is insufficient and there is a fear that the catalytic activity is lowered. When the content is more than 20 molar ratio, the control of the catalytic reaction is not easy, There is a possibility of causing it.

When the catalyst composition further contains the above-mentioned dienic monomer, the catalyst composition specifically includes 1 to 100 equivalents of a dienic monomer relative to 1 equivalent of the rare earth metal compound, more specifically 20 to 50 equivalents Equivalent < / RTI >

When the catalyst composition further comprises the reaction solvent, the catalyst composition may further contain 20 to 20,000 moles of reaction solvent per mole of the rare earth metal compound, more specifically 100 to 1,000 moles .

The catalyst composition having the above-described constitution can be produced by mixing the functionalizing agent, the rare earth metal compound, the alkylating agent, the halogen compound, and optionally the conjugated diene monomer and the reaction solvent according to a conventional method.

For example, in the case of a preliminary mixed catalyst composition, it can be produced by adding a functionalizing agent, a rare earth metal compound, an alkylating agent, a halogen compound and optionally a conjugated diene monomer sequentially or simultaneously to a reaction solvent and then mixing them.

As another example, in the case of the prepolymerized catalyst composition, it may be prepared by mixing a functionalizing agent, a rare earth metal compound, an alkylating agent, and a halogen compound in a reaction solvent, and then adding a conjugated diene monomer to prepolymerize.

At this time, in order to promote the production of catalytically active species, the mixing and polymerization process may be performed at a temperature range of 0 ° C to 60 ° C, and heat treatment may be performed in order to satisfy the above temperature condition.

More specifically, the catalyst composition is subjected to a first heat treatment at a temperature of from 10 캜 to 60 캜 after mixing the rare earth metal compound, the alkylating agent, the reaction solvent, and optionally the conjugated diene monomer, and the resultant mixture is added with a halogen compound Followed by a second heat treatment in a temperature range of 0 占 폚 to 60 占 폚.

In the catalyst composition produced by the above production method, catalytically active species are generated by the interaction of the constituents.

As described above, the catalytic composition according to the present invention can produce catalytically active species having better catalytic activity and polymerization reactivity than conventional ones due to the use of functionalizing agent. As a result, it is possible to produce a conjugated diene polymer having higher linearity and processability.

Specifically, the catalyst composition having the above composition can exhibit catalyst activity of 10,000 kg [polymer] / mol [Nd] · h or more during the polymerization for 5 minutes to 60 minutes within the temperature range of 20 ° C to 90 ° C . In the present invention, the catalytic activity is a value determined from the molar ratio of the rare earth metal compound to the total amount of the conjugated diene polymer produced.

Conjugated diene polymer

According to another embodiment of the present invention, there is provided a conjugated diene polymer produced by using the above catalyst composition and a method for producing the conjugated diene polymer.

The conjugated diene polymer according to one embodiment of the present invention can be produced by polymerizing a conjugated diene monomer according to a conventional method for producing a conjugated diene polymer, except that the catalyst composition for conjugated diene polymerization is used.

At this time, the polymerization reaction may be carried out by various polymerization methods such as bulk polymerization, solution polymerization, suspension polymerization or emulsion polymerization, or may be performed by a batch method, a continuous method, or a semi-continuous method. More specifically, it can be appropriately selected and carried out among the polymerization methods described above depending on the kind of the functionalizing agent used in the catalyst composition.

For example, when the functional vaporizer contained in the catalyst composition is a Sn compound, it can be carried out by the Andrew bottle type polymerization method, by the Si compound, by the batch type polymerization method, or by the continuous polymerization method in the case of the N- have.

Specifically, when produced by solution polymerization, the conjugated diene polymer according to one embodiment of the present invention can be carried out by charging a diene monomer into the above-mentioned catalyst composition for polymerization in a polymerization solvent and reacting.

The conjugated diene monomer can be used without particular limitation as long as it is usually used in the production of a conjugated diene polymer. Specific examples of the conjugated diene monomer include 1,3-butadiene, isoprene, 1,3-pentadiene, 1,3-hexadiene, 2,3-dimethyl-1,3-butadiene, Butadiene, 2-methyl-1,3-pentadiene, 3-methyl-1,3-pentadiene, 4-methyl-1,3-pentadiene or 2,4-hexadiene, Or a mixture of two or more thereof may be used. More specifically, the conjugated diene-based monomer may be 1,3-butadiene.

Further, other monomers copolymerizable with the conjugated diene monomer may be further used in consideration of the physical properties of the conjugated diene polymer finally produced during the polymerization reaction.

Specific examples of the other monomers include styrene, p-methylstyrene,? -Methylstyrene, 1-vinylnaphthalene, 3-vinyltoluene, ethylvinylbenzene, divinylbenzene, 4-cyclohexylstyrene, 2,4,6- Styrene, etc., and any one or a mixture of two or more thereof may be used. The other monomers may be used in an amount of 20% by weight or less based on the total weight of the monomers used in the polymerization reaction.

In this case, the conjugated diene-based monomer is not completely dissolved in a nonpolar solvent and used in the production of the conjugated diene-based polymer. Part of the total amount of the conjugated diene monomer is polymerized after being dissolved in the polymerization solvent, Or more, specifically, two or more times, more specifically, two to four times.

The polymerization solvent may be a nonpolar solvent, which is the same as the solvent which can be used in the production of the catalyst for polymerization.

When the polymerization solvent is used, the concentration of the monomer is not particularly limited, but may be 3% by weight to 80% by weight, more specifically 10% by weight to 30% by weight.

In the polymerization reaction, a molecular weight modifier such as trimethylaluminum, diisobutylaluminum hydride or trimethylsilane; A reaction terminator for completing a polymerization reaction such as polyoxyethylene glycol phosphate or the like; Or antioxidants such as 2,6-di-t-butyl paracresol and the like may further be used. In addition, other additives such as chelating agents, dispersing agents, pH adjusting agents, oxygen scavengers, oxygen scavengers and the like may be further optionally added to facilitate the solution polymerization.

In addition, the polymerization reaction may be carried out at a temperature of 0 ° C to 200 ° C, more specifically 20 ° C to 100 ° C.

In addition, the polymerization reaction may be carried out within the above-mentioned temperature range for 5 minutes to 3 hours until the conversion of the conjugated diene polymer reaches 100%, specifically 10 minutes to 2 hours.

As a result of the polymerization reaction as described above, a conjugated diene polymer is produced.

The conjugated diene-based polymer specifically includes a rare-earth metal-catalyzed conjugated diene-based polymer derived from a catalyst composition comprising the rare earth metal compound, that is, a rare-earth metal-catalyzed conjugated diene-based polymer containing an organic metal moiety activated from a catalyst, Butadiene-based polymer containing a butadiene monomer unit, more specifically, a neodymium-catalyzed butadiene-based polymer containing a 1,3-butadiene monomer unit. The conjugated diene-based polymer may be a polybutadiene comprising only 1,3-butadiene monomer.

In the present invention, the activated organometal moiety of the conjugated diene polymer means an activated organometal moiety at the terminal of the conjugated diene polymer (an activated organometal moiety at the molecular chain terminal), an activated organometallic moiety in the main chain or a side chain , And among these, when an activated organometallic moiety of the conjugated diene polymer is obtained by anionic polymerization or coordination anionic polymerization, the activated organometallic moiety may be a terminal activated organic metal moiety .

The conjugated diene-based polymer produced by the polymerization reaction may be dissolved or precipitated in a polymerization solvent. If dissolved in a polymerization solvent, it may be precipitated by the addition of a lower alcohol such as methyl alcohol, ethyl alcohol, or steam. Accordingly, the method for preparing a conjugated diene-based polymer according to an embodiment of the present invention may further include a precipitation and separation step for the conjugated diene-based polymer prepared after the polymerization reaction, wherein the conjugated diene- The filtration, separation and drying processes can be carried out according to a conventional method.

As described above, the method for producing a conjugated diene-based polymer according to one embodiment of the present invention can produce a conjugated diene-based polymer having high linearity and processability by using a functionalizing agent in the production of the catalyst composition.

Specifically, the conjugated diene-based polymer may contain a functional group derived from the functionalizing agent in the molecule.

The conjugated diene-based polymer may be a rare-earth metal-catalyzed conjugated diene-based polymer derived from a catalyst composition containing the rare-earth metal compound, that is, a rare-earth metal-catalyzed conjugated diene-based polymer containing an organic metal moiety activated from a catalyst, more specifically 1,3- A rare earth metal-catalyzed butadiene-based polymer including a monomer unit, more specifically, a neodymium-catalyzed butadiene-based polymer.

The conjugated diene polymer according to an embodiment of the present invention has a polydispersity (PDI) of 3.4 or less, which is a ratio (Mw / Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) It may have a narrow molecular weight distribution. When the PDI of the conjugated diene polymer is more than 3.4, there is a possibility that the mechanical properties such as abrasion resistance and impact resistance are lowered when applied to a rubber composition. More specifically, the polydispersity of the conjugated diene polymer may be not more than 3.2, in consideration of the remarkable effect of improving the mechanical properties of the polymer due to the polydispersity control.

The conjugated diene polymer according to an embodiment of the present invention may have a weight average molecular weight (Mw) of 300,000 g / mol to 1,200,000 g / mol, specifically 400,000 g / mol to 1,000,000 g / mol . The conjugated diene polymer according to an embodiment of the present invention may have a number average molecular weight (Mn) of 100,000 g / mol to 700,000 g / mol, and more specifically 120,000 g / mol to 500,000 g / mol

When the weight average molecular weight of the conjugated diene polymer is less than 300,000 g / mol, or when the number average molecular weight is less than 100,000 g / mol, the elastic modulus of the vulcanized product decreases, hysteresis loss increases, and abrasion resistance deteriorates. When the weight average molecular weight exceeds 1,200,000 g / mol or the number average molecular weight exceeds 700,000 g / mol, the workability of the rubber composition containing the conjugated diene polymer deteriorates and the kneading becomes difficult , It may be difficult to sufficiently improve the physical properties of the rubber composition. In the present invention, the weight-average molecular weight and the number-average molecular weight are the polystyrene-reduced molecular weights analyzed by gel permeation chromatography (GPC), respectively.

The conjugated diene polymer according to one embodiment of the present invention is characterized in that the conjugated diene polymer according to one embodiment of the present invention has a weight average molecular weight It is desirable to satisfy both the average molecular weight and the number average molecular weight conditions simultaneously. Specifically, the conjugated diene polymer preferably has a ratio (Mw / Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) of 3.4 or less and a weight average molecular weight (Mw) of 300,000 g / mol to 1,200,000 g / mol The ratio (Mw / Mn) of the number average molecular weight (Mn) of 100,000 g / mol to 700,000 g / mol, more specifically the weight average molecular weight (Mw) Average molecular weight (Mw) of 400,000 g / mol to 1,000,000 g / mol and number average molecular weight (Mn) of 120,000 g / mol to 500,000 g / mol.

In addition, the conjugated diene polymer exhibits a high degree of linearity due to the use of a functionalizing agent in its production process. The higher the linearity, the lower the degree of branching and the higher the solution viscosity. Specifically, when the value obtained by dividing the solution viscosity (SV) by the Mooney viscosity (MV) and correcting the value is referred to as linearity (SV / MV), the linearity of the conjugated diene polymer according to one embodiment of the present invention SV / MV) may be from 1 to 15, more specifically from 3.5 to 13, and even more specifically from 4 to 13.

In addition, the conjugated diene polymer may have a Mooney viscosity (ML1 + 4) at 100 ° C of 10 MU to 90 MU, specifically 20 MU to 80 MU. The solution viscosity of the conjugated diene polymer may be 100 cP to 600 cP, specifically 170 cP to 500 cP.

In the present invention, the Mooney viscosity can be measured by using a Mooney viscometer, for example, Monsanto MV2000E at 100 占 폚 using Rotor Speed 2 占 0.02 rpm, Large Rotor. The sample used was allowed to stand at room temperature (23 ± 3 ° C) for more than 30 minutes and 27 ± 3 g was taken, filled in the die cavity, and platen was operated. The unit of Mooney viscosity was MU (mooney Unit). In the present invention, the solution viscosity (SV) was measured in the same manner as in the measurement of the Mooney viscosity, and the viscosity of the polymer in 5% toluene was measured at 20 ° C.

More specifically, considering the remarkable improvement effect of the Mooney viscosity and the solution viscosity control, the conjugated diene polymer according to an embodiment of the present invention has a Mooney viscosity (MV) at 100 ° C of 20 MU to 80 MU , A solution viscosity (SV) of 100 cP to 600 cP and a linearity (SV / MV) of 3 to 13.

In addition, the conjugated diene polymer according to one embodiment of the present invention has a cis content (specifically, a cis-1,4 bond content) of 95% or more in the conjugated diene polymer as measured by Fourier transform infrared spectroscopy, More specifically, it may be 96% or more. The content of the vinyl bond in the conjugated diene polymer may be 1% or less. When the content of the cis-1,4 bond in the polymer is high, the linearity is increased and the abrasion resistance and crack resistance of the rubber composition can be improved when the rubber composition is incorporated into the rubber composition.

In addition, the conjugated diene polymer according to an embodiment of the present invention has pseudo-living properties. And thus can be modified through a modification process in which the end of the polymer is functionalized with a functional group such as a functional group having an interaction with an inorganic filler such as carbon black or silica. In this case, the method for producing a conjugated diene-based polymer according to an embodiment of the present invention may further include a step of denaturing the conjugated diene-based polymer produced as a result of the polymerization reaction using a denaturant.

The above-mentioned denaturation step can be carried out according to a conventional denaturation method, except that the conjugated diene-based polymer according to the present invention is used.

As the modifier, a compound capable of imparting the functional group to the polymer during the reaction with the conjugated diene polymer or raising the molecular weight by coupling may be used. Specific examples thereof include an azacyclopropane group, a ketone group, An amide group, a thioamide group, an isocyanate group, a thioisocyanate group, a halogenated isocyano group, an epoxy group, a thioepoxy group, an imine group, and an amino group, and a carboxyl group, a thiocarboxyl group, a carbonate, a carboxylic acid anhydride, MZ bond, wherein M is selected from the group consisting of Sn, Si, Ge and P, and Z is a halogen atom, and further comprising at least one functional group selected from the group consisting of Sn Proton and onium salts. More specifically, the termination modifier is selected from the group consisting of alkoxysilanes, imine-containing compounds, esters, ester-carboxylate metal complexes, alkyl ester carboxylate metal complexes, aldehydes or ketones, amides, isocyanates, isothiocyanates, Or a mixture of two or more thereof. As an example, the modifier may be (E) -N, N-dimethyl-4 - ((undecylimino) methyl) benzeneamine Lt; / RTI > The modifier may be used in an amount of 0.01 to 200 equivalents, more specifically 0.1 to 150 equivalents based on 1 equivalent of the rare earth metal compound.

The conjugated diene-based polymer produced through the above-described denaturation step contains a modifier-derived functional group in the polymer, specifically at the terminal thereof. Specifically, the functional group-derived functional group includes an azacyclopropane group, a ketone group, a carboxyl group, a thiocarboxyl group, An amide group, a thioamide group, an isocyanate group, a thioisocyanate group, a halogenated isocyano group, an epoxy group, a thioepoxy group, an imine group and an MZ bond (provided that the above- M is selected from the group consisting of Sn, Si, Ge and P, and Z is a halogen atom). By including such a functional group derived from a modifier, excellent affinity to an inorganic filler such as carbon black or silica used in the production of the rubber composition can be exhibited and the dispersibility of the inorganic filler can be enhanced, and the physical properties of the resultant rubber composition can be further improved . Accordingly, the modified conjugated diene polymer is provided according to another embodiment of the present invention.

Rubber composition

According to another embodiment of the present invention, there is provided a rubber composition comprising the above conjugated diene polymer.

Specifically, the rubber composition may include 10 wt% to 100 wt% of the conjugated diene polymer and 90 wt% or less of the rubber component. If the content of the conjugated diene polymer is less than 10% by weight, the abrasion resistance, crack resistance and ozone resistance improvement effect of the rubber composition may be insignificant.

The rubber component is specifically a natural rubber (NR); (BR), hydrogenated BR, polyisoprene (IR), butyl rubber (IIR), ethylene-propylene (R) (Ethylene-co-butadiene), poly (ethylene-co-butadiene), poly (ethylene-co-butadiene) Poly (styrene-co-isoprene), poly (styrene-co-isoprene-co-butadiene), poly (isoprene-co-butadiene) Rubber, silicone rubber, epichlorohydrin rubber and the like, and any one or a mixture of two or more of them may be used.

The rubber composition may further include at least 10 parts by weight of a filler based on 100 parts by weight of the rubber component. In this case, the filler may be carbon black, starch, silica, aluminum hydroxide, magnesium hydroxide, clay (hydrated aluminum silicate) or the like, and any one or a mixture of two or more thereof may be used.

In addition to the above rubber components and fillers, a compounding agent commonly used in the rubber industry such as vulcanizing agent, vulcanization accelerator, anti-aging agent, scorch inhibitor, softening agent, zinc oxide, It can be appropriately selected and compounded within a range that does not hinder the purpose.

The rubber composition as described above contains a conjugated diene polymer prepared using a catalyst composition containing a functionalizing agent and having excellent linearity and processability so that the rubber composition can be improved in balance without any bias in terms of abrasion resistance, Lt; / RTI >

Accordingly, the rubber composition can be used in a variety of applications such as passenger cars, trucks, tires for buses (e.g., tire treads, side weirs, sub treads, bead fillers, braking members, , A gasket, a membrane, a hose, a belt, a sole, an anti-vibration rubber or a window seal.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

Example 1-1: Preparation of conjugated diene-based polymer

A neodymium compound of Nd (2,2-diethyldecanoate) ₃ was introduced into a hexane solvent at a concentration of 40% by weight, and then a functionalizing agent (i) having the following chemical structure (1 equivalent based on 1 equivalent of neodymium compound) And then diisobutylaluminum hydride (DIBAH) and diethylaluminum chloride (DEAC) were added in a molar ratio of neodymium compound: DIBAH: DEAC = 1: 10: 2.4, and then mixed to prepare a catalyst composition .

After vacuum and nitrogen were added alternately to the completely dried organic reactor, 4.7 kg (1,3-butadiene content = 500 g) of 1,3-butadiene / hexane mixed solution was added to the reactor in a vacuum state, Followed by polymerization at 70 DEG C for 60 minutes to prepare a butadiene polymer.

(i)

(i)

Example 1-2: Preparation of conjugated diene-based polymer

A butadiene polymer was prepared in the same manner as in Example 1-1 except that the functionalizing agent (i) was used in an amount of 5 equivalents based on 1 equivalent of the neodymium compound in Example 1-1.

Example 1-3: Preparation of conjugated diene-based polymer

The procedure of Example 1 was repeated except that the functionalizing agent of the following chemical structure (ii) and the equivalent amount of the neodymium compound (5 equivalents) were used as the functionalizing agent in Example 1-1, .

(ii)

(ii)

Example 1-4: Preparation of conjugated diene-based polymer

1,3-butadiene (33 equivalents based on 1 equivalent of neodymium compound), Nd (2,2-diethyl decanoate) ₃ (I) (1 equivalent based on 1 equivalent of neodymium compound), diisobutylaluminum hydride (DIBAH), and diethylaluminum chloride (DEAC) with neodymium compound (concentration in hexane = 40 wt%) and neodymium compound : DIBAH: DEAC = 1: 9.2: 2.4, and then mixed to prepare a catalyst composition.

Butadiene polymer was prepared in the same manner as in Example 1-1 except that the prepared catalyst composition was used.

Example 1-5: Preparation of conjugated diene-based polymer

In hexane solvent, Nd (2,2- diethyl decanoate) _3, neodymium (hexane solvent in the concentration = 40% by weight) and to the functional group agent (iii) the chemical structure (neodymium compound to 1 equivalent based on 1 equivalent) And then diisobutylaluminum hydride (DIBAH) and diethylaluminum chloride (DEAC) were added in a molar ratio of neodymium compound: DIBAH: DEAC = 1: 10: 2.4 and then mixed to prepare a catalyst composition Respectively.

After vacuum and nitrogen were added alternately to the completely dried organic reactor, 4.7 kg (1,3-butadiene content = 500 g) of 1,3-butadiene / hexane mixed solution was added to the reactor in a vacuum state, Followed by polymerization at 70 캜 for 60 minutes to prepare a butadiene polymer (polymerization conversion rate: 100%).

(iii)

(iii)

Comparative Example 1: Production of conjugated diene-based polymer

In hexane solvent, Nd (2,2- diethyl decanoate) neodymium compound ₃ (hexanes concentration = 40% by weight), di-isobutyl aluminum hydride (DIBAH) and diethylaluminum chloride (DEAC) neodymium compound : DIBAH: DEAC = 1: 10.1: 2.4, and then mixed to prepare a catalyst for polymerization.

Butadiene polymer was prepared in the same manner as in Example 1, except that the prepared polymerization catalyst was used.

Example  2-1 to 2-5, and Comparative Example  2: Conjugate Dien series  Preparation of polymer

89 mg (0.054 mmol) of neodymium compound of Nd (2,2-diethyldecanoate) ₃ (concentration in hexane = 40% by weight) in the hexane solvent and the functionalizing agent shown in the following Table 1 1), diisobutylaluminum hydride (DIBAH) (0.12 ml, 0.675 mmol) and diethylaluminum chloride (DEAC) (0.13 ml, 0.130 mmol) were sequentially charged and mixed to prepare a catalyst composition. Subsequently, 150 g of 1,3-butadiene / hexane mixed solution (1,3-butadiene content = 22.5 g) was added to the reactor which had been completely dried, and the catalyst composition prepared in the above After the addition, a polymerization reaction was carried out at 70 占 폚 for the polymerization time shown in Table 1 below to prepare a butadiene polymer. The conversion of each butadiene polymer in the preparation thereof was measured and shown in Table 1 below.

Example Nd-based compound Functionalizing agent Polymerization time Conversion Rate Kinds usage
(Based on 1 equivalent of Nd-based compound) 2-1 Nd series

1 equivalent 30 minutes 98% 2-2 Nd series 5 eq. 30 minutes 100% 2-3 Nd series

1 equivalent 30 minutes 97% 2-4 Nd series 3 equivalents 30 minutes 100% 2-5 Nd series

2 equivalents 30 minutes ND Comparative Example 2 Nd series - - 30 minutes ND

 In Table 1, 'ND' means not measured.

Experimental Example  One

Various properties were measured for the butadiene polymers prepared in Examples 2-1, 2-2, 2-4 and 2-5 and Comparative Example 2 by the following methods, and the results are shown in Table 2.

1) Weight average molecular weight (Mw), number average molecular weight (Mn), and polydispersity (PDI)

The weight average molecular weight (Mw) and the number average molecular weight (Mn) of the butadiene polymer prepared by gel permeation chromatography (GPC) were measured and the polydispersity (PDI = Mw / Mn) Respectively.

Specifically, the prepared butadiene-based polymer was dissolved in THF for 30 minutes at 40 ° C, respectively, and then loaded on gel permeation chromatography. At this time, the column was combined with two bags of PLgel Olexis column and one bag of PLgel mixed-C column of Polymer Laboratories. In addition, a column of a mixed bed type was used as a new column, and polystyrene was used as a gel permeation chromatography (GPC) standard material.

2) Viscosity characteristics

Mooney Viscosity (MV, (ML1 + 4, @ 100 ° C) (MU): The Mooney viscosity (MV) was measured at 100 ° C. using a Monsanto MV2000E rotor speed 2 ± 0.02 rpm and a large rotor for the butadiene polymer The samples were allowed to stand at room temperature (23 ± 3 ℃) for more than 30 minutes and then 27 ± 3 g were collected and filled in the die cavity. Platen was operated to measure the Mooney viscosity by applying torque.

3) Viscosity (cP) of polymer in 5% toluene at solution viscosity (SV) 20 was measured.

Comparative Example 2 Example 2-1 Example 2-2 Examples 2-4 Example 2-5 Functionalizing agent
(content) - i (1 eq) i (5 eq) ii (3eq) iii (2eq) catalyst Nd series Nd series Nd series Nd series Nd series GPC Mn g / mol 2.20 · E + 05 2.54 · E + 05 2.45 · E + 05 2.61 · E + 05 2.71 · E + 05 Mw g / mol 6.08 · E + 05 7.00 · E + 05 7.06 · E + 05 7.71 · E + 05 7.82 · E + 05 Mw / Mn - 2.76 2.76 2.88 2.95 2.98 MV ML1 + 4
(@ 100 ° C) MU 43.0 42.6 41.9 45.3 49.8 Solution viscosity (SV) (cp) 150 178 204 264 175

In Table 2, 'eq' means equivalent.

Examples 2-1, 2-2, 2-4 and 2-5 prepared using the functionalizing agent according to the present invention exhibited increased Mn and Mw values as compared with Comparative Example 1, Showed a higher value than 175 cP.

Experimental Example  2

The rubber specimens were prepared using the butadiene polymers prepared in Examples 2-1, 2-2, 2-4 and 2-5, and then the rubber specimens were subjected to the following abrasion characteristics, viscoelasticity and workability , And the results are shown in Table 3. < tb > < TABLE > For comparison, rubber specimens were prepared in the same manner using the butadiene synthetic rubber CB24 manufactured by Lanxess (Comparative Example 3), and their properties were measured.

Specifically, 70 parts by weight of graphite and 22.5 parts by weight of process oil were added to 100 parts by weight of the butadiene polymer prepared in 2-1, 2-2, 2-4 or 2-5 as raw material rubber, 2 parts by weight of an anti-static agent (TMDQ), 3 parts by weight of zinc oxide (ZnO) and 2 parts by weight of stearic acid were mixed to prepare respective rubber compounds. 2 parts by weight of sulfur, 2 parts by weight of a vulcanization accelerator (CZ) and 0.5 parts by weight of a vulcanization accelerator (DPG) were added to the rubber compound thus prepared, and vulcanized at 160 DEG C for 25 minutes to prepare rubber specimens.

1) M-300% Index, Tensile stress index, and Elongation index:

Modulus at the time after t90 minutes cure at 150 ℃ for the rubber composition to 300% according to ASTM D412 elongation (300% modulus, kg · f / cm 2), tensile strength of the vulcanizate (tensile strength, kg · f / cm 2), And the elongation (%) of the vulcanizate at the time of fracture were measured. The measured values of Comparative Example 3 were indexed to 100 for each of the above measured values. The higher the value, the better the mechanical properties.

2) Viscoelastic properties

A dynamic mechanical analyzer from TA Corporation was used. Tan δ values were measured by varying the strain at a frequency of 10 Hz and a measurement temperature (-70 ° C. to 70 ° C.) in a twist mode. The Pheny effect was expressed as the difference between the minimum value and the maximum value at 0.28% to 40% of the strain. The smaller the fines effect, the better the dispersibility of fillers such as silica. The lower the tan delta value at a high temperature of 50 DEG C to 70 DEG C is, the lower the hysteresis loss is, and the low rolling resistance of the tire, that is, the low fuel consumption is excellent. In the present invention, the degree of improvement is indexed by setting the measured value of Comparative Example 3 to 100 for each measured value. Therefore, the higher the value, the lower the hysteresis loss and the better the low rolling resistance, that is, the low fuel consumption.

3) DIN (loss volume index: ARI _A , Abrasion resistance index, Method A) Measured according to the method specified in the ASTM D5963 test specification and indexed with the measured value of Comparative Example 3 as 100. The value The higher the abrasion resistance, the better the abrasion resistance.

Comparative Example 3 Example 2-1 Example 2-2 Examples 2-4 Example 2-5 Functionalizing agent
(content) - i (1 eq) i (5 eq) ii (3eq) iii (2eq) catalyst Nd series Nd series Nd series Nd series Nd series M-300% Index 100 110 106 112 99 Tensile stress index 100 108 110 120 103 Elongation index 100 99 102 105 103 avg. Tanδ @ 50 ℃ ~ 70 ℃ Index 100 110 108 115 105 DIN 100 97 95 115 104

In Table 3, 'eq' means equivalence.

As a result of the tests, the conjugated diene polymers of Examples 2-1, 2-2, 2-4 and 2-5, which were prepared using the functionalizing agent according to the present invention, 3, and showed remarkable improvement in terms of low fuel consumption characteristics. In addition, the abrasion resistance surface showed almost the same level of abrasion resistance improvement effect when the error range was ± 10, and in particular, the polymer of Example 2-4 showed the most excellent abrasion resistance performance.

Example 3-1: Preparation of modified conjugated diene polymer

0.66 g (0.20 mmol) of neodymium compound of Nd (2,2-diethyldecanoate) ₃ (concentration in hexane = 40% by weight) and the functionalizing agent (FGA) (3 equivalents based on 1 equivalent of neodymium compound), 1.4 g (1.8 mmol) of diisobutylaluminum hydride (DIBAH) and 0.3 g (0.46 mmol) of diethylaluminum chloride (DEAC) were sequentially added and mixed to prepare a catalyst composition .

Vacuum and nitrogen were added alternately to the completely dried reactor, and 4673 g of 1,3-butadiene / hexane mixed solution (1,3-butadiene content = 500 g) was added to a reactor in a vacuum state. Thereafter, a polymerization reaction was carried out at 70 DEG C for 60 minutes to prepare a butadiene polymer.

A butadiene-based polymer was prepared by adding a terminal modifier (iv) having the following chemical structure (5 equivalents based on 1 equivalent of neodymium compound) to the prepared butadiene polymer and reacting for 30 minutes.

(iv)

(iv)

Example 3-2: Preparation of modified conjugated diene polymer

(BD) (5 equivalents based on 1 equivalent of neodymium compound) and 0.66 g (0.20 mmol) of neodymium compound of Nd (2,2-diethyldecanoate) ₃ in hexane solvent, , 1.4 g (1.8 mmol) of diisobutylaluminum hydride (DIBAH) and 0.3 g (0.46 mmol) of diethylaluminum chloride (DEAC) were sequentially introduced Followed by mixing to prepare a catalyst composition.

The end-modified butadiene-based polymer was prepared in the same manner as in Example 3-1, except that the prepared catalyst composition was used.

BD content
(Based on 1 equivalent of Nd-based compound) Functional Vaporizer Type Functional Vaporizer Content
(Based on 1 equivalent of Nd-based compound) Conversion Rate
(%) Mooney viscosity (MU) Example
3-1 0eq

3.0eq 100 45.3 Example
3-2 5eq

2.0eq 100 49.8

In Table 4, 'eq' means equivalence.

Experimental Example  3

The weight average molecular weight (Mw), the number average molecular weight (Mn), and the polydispersity (PDI) of the modified butadiene polymer prepared in Examples 3-1 and 3-2 were measured in the same manner as in Experimental Example 1, ), Mooney viscosity (MV, (ML1 + 4, @ 100 ° C)) (MU) and solution viscosity (SV) were measured and are shown in Table 5 below.

Using the modified butadiene polymers prepared in Examples 3-1 and 3-2, rubber specimens were produced in the same manner as in Experimental Example 2, and then the wear characteristics, viscoelasticity and workability were measured, The measurement value of Comparative Example 3 was set at 100 for the measured value and indexed. The results are shown in Table 5. For comparison, rubber specimens were prepared in the same manner using butadiene synthetic rubber CB24 manufactured by Lanxess, and the respective properties were measured (Comparative Example 3).

Comparative Example 3
(CB24) Example 3-1 Example 3-2 MV (MU) 43 45.3 49.8 GPC Mn (g / mol) 2.20 2.61 ND Mw (g / mol) 6.08 7.71 ND Mw / Mn 2.76 2.95 ND The solution viscosity (cP) 150 263.9 ND M-300% Index 100 112 99 Tensile stress index 100 120 103 Elongation index 100 105 103 avg. Tanδ @ 50 ℃ ~ 70 ℃ Index 100 115 105 DIN 100 115 104

In Table 5, 'ND' means not measured.

As a result, the modified polymers of Examples 3-1 and 3-2 prepared using the catalyst composition containing the functionalizing agent according to the present invention exhibited higher Mn and Mw and solution viscosities than Comparative Example 3, respectively.

In addition, the rubber specimens prepared using the modified polymers of Examples 3-1 and 3-2 respectively showed improved effects in terms of mechanical strength, abrasion resistance, and low fuel consumption characteristics as compared with Comparative Example 3.

The change in Mooney viscosity (ML1 + 4) according to vulcanization was also observed for the rubber specimens prepared above.

Specifically, the rubber specimens (Raw) prepared only from the modified polymers of Examples 3-1 and 3-2, the rubber specimens (CMB) prepared by using the rubber formulations prepared as described above, and the rubber formulations The Mooney viscosity (ML1 + 4) was measured on a rubber specimen (FMB) produced by vulcanization after vulcanization with sulfur, using a Monsanto MV2000E at 100 ° C with a rotor speed of 2 ± 0.02 rpm and a large rotor. The samples were allowed to stand at room temperature (23 ± 3 ° C) for 30 minutes or more, and 27 ± 3 g was collected, filled in the die cavity, and platen was operated. The results are shown in Table 6 below.

Functional Vaporizer Usage (equivalent) Amount of denaturant (equivalent) Unburnt character Raw CMB FMB MV Example 3-1 3 5 45.3 83.9 75.4 30.1 Example 3-2 5 5 50.6 80.8 74 23.4

In Table 6,

Raw: Rubber specimen made only of polymer

CMB: Rubber specimen prepared using the rubber compound after its preparation

FMB: A rubber specimen prepared by vulcanization after addition of sulfur to rubber compound.

The difference in Mooney viscosity between Raw and FMB of the polymer is usually in the range of 18 to 30, and the Mooney viscosity difference (ΔMV) in the case of Raw and FMB is about 18 to 20 in the case of Comparative Example 3. From the above experimental results, it can be confirmed that the polymers of Examples 3-1 and 3-2 also exhibit a Mooney viscosity variation substantially similar to Comparative Example 3.

The tensile stress index (TS), elongation index (TE), DIN, 0 캜 tan δ value, and the tensile stress value of the rubber specimen prepared above were measured in the same manner as above. 60 占 폚 and Tan? Values were measured, respectively, and the measurement value of Comparative Example 3 was set to 100 and indexed. The results are shown in Table 7.

In this case, the higher the values of the indexed M-300% index (M300%), the tensile stress index (TS) and the elongation index (TE), the better the mechanical properties. Also, the higher the DIN value, the better the abrasion resistance. The higher the measured value of the low temperature 0 DEG C Tan? Is, the better the wet road surface resistance is, and the lower the measured value of Tan DELTA at 50 DEG C to 70 DEG C is, the lower the hysteresis loss is and the lower the rolling resistance great. In the present invention, the degree of improvement is indexed by setting the measured value of Comparative Example 3 to 100 for each measured value. Therefore, the higher the indexed value, the better the wet road surface resistance, the lower the hysteresis loss, and the better the low rolling resistance, that is, the lower fuel consumption.

M300% TS TE DIN 0 C Tan δ 60 캜 Tan δ Comparative Example 3 100 100 100 100 100 100 Example 3-1 112 120 105 103 113 115 Example 3-2 102 100 101 115 104 103

Experimental results show that the unvulcanized rubber specimens prepared using the modified polymers of Examples 3-1 and 3-2, respectively, show improved effects in terms of mechanical strength, abrasion resistance, wet road surface resistance and fuel efficiency compared to Comparative Example 3 Respectively.

Claims (18)

A functionalizing agent represented by the following general formula (1)
Rare earth metal compounds,
Alkylating agents, and
A catalyst composition for preparing a conjugated diene-based polymer containing a halogen compound:
[Chemical Formula 1]
(X ₁ ) _a -M ₁ - ([YM ₂ - (X ₂ ) _n-1 ]) _ma
In Formula 1,
m is the valence number of M ₁ , n is the valence number of M ₂ ,
a is 0? a? m-1,
M ₁ and M ₂ are each independently selected from the group consisting of Si, Sn and N,
X ₁ and X ₂ each independently represents a hydrogen atom, an alkyl group, an alkylsilyl group, a dialkylsilyl group, a trialkylsilyl group, an allylsilyl group, a diallylsilyl group, a triallylsilyl group, an alkylallylsilyl group, A silyl group, a dialkylallylsilyl group, and a covalent bonding functional group, wherein the alkyl group is a straight or branched alkyl group having 1 to 6 carbon atoms,
Y is a divalent hydrocarbon group which is substituted or unsubstituted with at least one covalent functional group, provided that at least one of X ₁ , X ₂ and Y contains a covalent functional group, and
The covalent bonding functional group is a functional group selected from the group consisting of a vinyl group, an allyl group, a methallyl group and a (meth) acryl group.
delete delete The method according to claim 1,
And Y is an alkylene group having 2 to 20 carbon atoms or an alkylene group having 2 to 20 carbon atoms substituted with the covalent bonding functional group.
The method according to claim 1,
Wherein the functionalizing agent comprises any one or a mixture of two or more members selected from the group consisting of compounds represented by the following formulas (2a) to (2g):

In the above formulas (2a) to (2g), nBu means an n-butyl group and TMS means a trimethylsilyl group.
The method according to claim 1,
Wherein said functionalizing agent comprises a compound wherein m and n are each an integer of 3 and M ₁ and M ₂ are each N and Y is a divalent hydrocarbon group substituted by said covalent functional group of 1 or more A catalyst composition for producing a conjugated diene polymer.
The method according to claim 1,
Wherein m and n are each an integer of 3, M ₁ and M ₂ are each N, X ₁ and X ₂ are each independently -SiR _d R _e R _f wherein R _d R _e and R _f is each independently an alkyl group having 1 to 6 carbon atoms), and Y is a divalent hydrocarbon group substituted by at least one of the above covalent functional groups.
The method according to claim 1,
The functional group agents include, but are selected from the group consisting of M ₁ and M ₂ are each Si, Sn and N In Formula 1, M ₁ and M ₂ are N at the same time is not,
Y is a divalent hydrocarbon group of 1 to 20 carbon atoms unsubstituted with the covalent bond functional group,
X ₁ and X ₂ are each independently an alkyl group or a covalent bond functional group, at least one of X ₁ and X ₂ includes the covalent bonding functional group, wherein the alkyl group is a straight or branched Of an alkyl group of the conjugated diene-based polymer.
The method according to claim 1,
Wherein the rare earth metal compound comprises a neodymium compound represented by the following formula (3): < EMI ID =
(3)

In Formula 3, R ₁ to R ₃ are each independently a hydrogen atom or a linear or branched alkyl group having 1 to 12 carbon atoms.
The method according to claim 1,
Wherein the alkylating agent comprises an organoaluminum compound represented by the following general formula (4): < EMI ID =
[Chemical Formula 4]
Al (R) _z (X) _{3- z}
In Formula 4,
Each R is independently a hydrocarbyl group; Or a heterohydrocarbyl group containing at least one hetero atom selected from the group consisting of a nitrogen atom, an oxygen atom, a boron atom, a silicon atom, a sulfur atom and a phosphorus atom in a hydrocarbyl group structure,
X is independently selected from the group consisting of a hydrogen atom, a halogen group, a carboxyl group, an alkoxy group, and an aryloxy group,
and z is an integer of 1 to 3.
The method according to claim 1,
Wherein the functionalizing agent is contained in an amount of 20 equivalents or less with respect to 1 equivalent of the rare earth metal compound in an amount of 5 to 200 moles of the alkylating agent and 1 to 20 moles of the halogen compound A catalyst composition for producing a conjugated diene polymer.
The method according to claim 1,
A diene-based monomer, and an aliphatic hydrocarbon-based solvent. The catalyst composition for producing a conjugated diene-based polymer according to claim 1,
A catalyst composition prepared using the catalyst composition according to claim 1,
A Mooney viscosity of 10 to 90 MU at 100 占 폚, and a polydispersity of 3.4 or less.
14. The method of claim 13,
Wherein the conjugated diene polymer comprises a functional group derived from a functionalizing agent represented by the following formula (1) in a polymer:
[Chemical Formula 1]
(X ₁ ) _a -M ₁ - ([YM ₂ - (X ₂ ) _n-1 ]) _ma
In Formula 1,
m is the valence number of M ₁ , n is the valence number of M ₂ ,
a is 0? a? m-1,
M ₁ and M ₂ are each independently selected from the group consisting of Si, Sn and N,
X ₁ and X ₂ each independently represents a hydrogen atom, an alkyl group, an alkylsilyl group, a dialkylsilyl group, a trialkylsilyl group, an allylsilyl group, a diallylsilyl group, a triallylsilyl group, an alkylallylsilyl group, A silyl group, a dialkylallylsilyl group, and a covalent bonding functional group, wherein the alkyl group is a straight or branched alkyl group having 1 to 6 carbon atoms,
Y is a divalent hydrocarbon group which is substituted or unsubstituted with at least one covalent functional group, provided that at least one of X ₁ , X ₂ and Y contains a covalent functional group, and
The covalent bonding functional group is a functional group selected from the group consisting of a vinyl group, an allyl group, a methallyl group and a (meth) acryl group.
A process for producing a conjugated diene-based polymer comprising the step of polymerizing a conjugated diene-based monomer using the catalyst composition according to claim 1.
16. The method of claim 15,
Further comprising the step of adding a modifier after the polymerization reaction and reacting.
14. A rubber composition comprising the conjugated diene-based polymer according to claim 13.
A tire component produced using the rubber composition according to claim 17.