KR20160143271A - End-modified conjugated diene polymer and method for preparing the same - Google Patents

Abstract

An embodiment of the present invention provides a terminally-modified conjugated diene-based polymer, which is a polymer represented by the following general formula (1), and a process for producing the same.
[Chemical Formula 1]

In Formula 1,
wherein p is a conjugated diene polymer chain, R ¹ and R ² are each C ₁ to a hydrocarbon chain or a hydrocarbon chain containing a heteroatom in the C ₁ to C ₂₀ of the C _20, R ³ and R ⁴ are each C ₁ to a hydrocarbon chain of ₂₀ C, an integer of 0 to 2, a and b, respectively.

Description

MODIFIED CONJUGATED DIENE POLYMER AND METHOD FOR PREPARING THE SAME [0002]

The present invention relates to an end-modified conjugated diene-based polymer and a process for producing the same.

Recently, interest in high-performance tires for environment-friendly and energy-saving has been increased, and various researches are being carried out to develop high-performance rubbers having dynamic properties such as rotational resistance and wet resistance, mechanical properties, and processability.

In general, styrene-butadiene rubber (hereinafter referred to as 'SBR') or butadiene rubber (hereinafter referred to as 'BR') is used as tire rubber, and these are mainly produced by solution polymerization.

The solution polymerization method can control the structure and coupling ratio of a monomer or a polymer by a method of producing a rubber by polymerizing a monomer in a solvent using an organometallic compound as an initiator, Is widely used as a method for producing tire rubber.

Further, according to the solution polymerization method, by introducing a functional group into a part of the polymer using a modifier, cold flow at a room temperature can be controlled, and workability and dispersibility can be improved when mixed with a reinforcing agent In particular, the compatibility with carbon black or silica, which is a reinforcing agent used for compounding a rubber composition for a tire, can be enhanced to improve dynamic properties such as abrasion resistance, rolling resistance and wetting resistance of the tire.

In order to improve the compatibility with conventional reinforcing agents such as silica or carbon black, a method has been proposed in which the terminal of the conjugated diene polymer is substituted with an alkoxysilane-based compound. However, steam-stripping The alkoxysilane group located at the end of the polymer is hydrolyzed by steam or hot water to form a Si-O-Si bond between the polymers, thereby raising the Mooney viscosity rapidly.

U.S. Published Patent Application No. 2010-0152369 has an advantage in that the alkoxysilane-based compound containing a primary amine substituted with a hydrolyzable protecting group can be used as a terminal modifier to reduce the hysteresis of a tire produced therefrom In this case, there is a limit in terms of economics due to the application of the protective device.

Therefore, there is a need to develop a conjugated diene polymer for tire tread which is capable of enhancing compatibility or compatibility with a reinforcing agent through terminal modification and improving the mechanical and dynamic properties of a tire produced from the tether.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a tire having improved endurance and improved mechanical properties and dynamic properties of a final product, while improving compatibility with a reinforcing agent such as silica and carbon black. To provide a modified conjugated diene polymer and a process for producing the same.

According to an aspect of the present invention, there is provided an end-modified conjugated diene polymer, which is a polymer represented by the following general formula (1).

[Chemical Formula 1]

In Formula 1, p is a conjugated diene-based polymer chain, and, R ¹ and R ² are hydrocarbon chains containing the hetero atoms of the C ₁ to C ₂₀ hydrocarbon chain or a C ₁ to C _20, respectively, R ³ and R ⁴ Are each a C ₁ to C ₂₀ hydrocarbon chain, and a and b may be an integer of 0 to 2, respectively.

In one embodiment, the conjugated diene-based polymer chain may be a polymer chain comprising a conjugated diene-based monomer.

In one embodiment, the polymer chain may be a copolymer chain comprising an aromatic vinyl-based monomer.

Further, another aspect of the present invention provides a rubber composition for a tire comprising the above-mentioned end-modified conjugated diene-based polymer.

In one embodiment, the rubber composition for a tire may have a Mooney viscosity of 80 to 100.

According to still another aspect of the present invention, there is provided a method for producing a living polymer, comprising: (a) synthesizing a living polymer by polymerizing at least one monomer of a conjugated diene monomer and an aromatic vinyl monomer in the presence of a solvent, a Lewis base and an organometallic compound; And (b) adding a compound represented by the following formula (2) to the living polymer to denature the end of the living polymer. The present invention also provides a method for producing an end-modified conjugated diene polymer.

(2)

In Formula 2, R ¹ and R ² are each C ₁ to C and ₂₀ hydrocarbon chain or a hydrocarbon chain containing a heteroatom in the C ₁ to C ₂₀ in a hydrocarbon of R ³ to R ⁵ are C ₁ to C _20, respectively Chain, and a and b may each be an integer of 0 to 2.

In one embodiment, the organometallic compound may be used in an amount of 0.01 mmol to 10 mmol based on 100 g of the monomer.

In one embodiment, the organometallic compound may be one selected from the group consisting of an organolithium compound, an organosodium compound, an organic potassium compound, an organic rubidium compound, and an organic cesium compound.

In one embodiment, the molar ratio of the organometallic compound to the compound represented by Formula 2 may be 1: 0.5 to 3.0.

The end-modified conjugated diene polymer according to one aspect of the present invention introduces an alkoxysilane compound containing an allyl group or an epoxy group at the end of the main chain to increase the bonding force between the polymer and the reinforcing agent by inducing additional reaction with the reinforcing agent So that the mechanical properties and dynamic properties of the final product tire can be improved.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

The invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The end-modified conjugated diene polymer

One aspect of the present invention provides an end-modified conjugated diene-based polymer, which is a polymer represented by the following formula (1).

[Chemical Formula 1]

In Formula 1, p is a conjugated diene-based polymer chain, and, R ¹ and R ² are hydrocarbon chains containing the hetero atoms of the C ₁ to C ₂₀ hydrocarbon chain or a C ₁ to C _20, respectively, R ³ and R ⁴ Are each a C ₁ to C ₂₀ hydrocarbon chain, and a and b may be an integer of 0 to 2, respectively.

When the rubber composition is formulated using the polymer represented by the above formula (1), the conjugated diene polymer and the silica are adjacent to each other by hydrogen bonding between the silica as the reinforcing agent and the amine group, and the alkoxysilane Covalent bonds can be formed between tile and silica.

Further, the allyl group or the epoxy group can enhance the crosslinking between the conjugated diene-based polymer and the silica. Thus, dynamic properties such as wetting resistance and rotational resistance required for a tire and mechanical properties can be improved.

Referring to Formula 1, it is preferable that the terminal-modified conjugated diene-based polymer is one wherein the conjugated diene-based monomer is polymerized singly or the terminal of the main chain in which the conjugated diene-based monomer and the aromatic vinyl-based monomer are copolymerized is modified with an alkoxysilane-based compound .

Wherein the conjugated diene monomer is at least one member selected from the group consisting of 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 1,3-hexadiene, 2,3- 1,3-butadiene, 2-chloro-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, and octadiene. , And preferably 1,3-butadiene, isoprene, or 2,3-dimethyl-1,3-butadiene, but is not limited thereto.

Wherein the aromatic vinyl monomer is at least one selected from the group consisting of styrene,? -Methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,4- diisopropylstyrene, Butylstyrene, 4-tert-butylstyrene, 4-tert-butylstyrene, 4-tert-butylstyrene, 4- Styrene, N, N -dimethylaminoethylstyrene, 1-vinyl-5-hexylnaphthalene, 1-vinylnaphthalene, divinylnaphthalene, divinylbenzene, trivinylbenzene, vinylbenzyldimethylamine, (4-vinylbenzyl) dimethylamino And at least one member selected from the group consisting of vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, And preferably, it may be styrene or? -Methylstyrene, but is not limited thereto.

In this case, the weight ratio of the conjugated diene-based monomer to the aromatic vinyl-based monomer is 55% by weight to 95% by weight, and the weight ratio of the conjugated diene-based monomer to the aromatic vinyl- 5% to 45% by weight.

When the content of the aromatic vinyl monomer in the conjugated diene polymer chain is within the above range, the glass transition temperature (Tg) of the copolymer is increased and the dynamic properties required for the tire such as wetting resistance, rotational resistance and braking force And fuel economy (fuel efficiency) can be improved.

Further, another aspect of the present invention provides a rubber composition for a tire comprising the above-mentioned end-modified conjugated diene-based polymer. The rubber composition for a tire may further comprise a reinforcing agent such as silica or carbon black.

Generally, when a rubber composition for a tire is prepared by blending a polymer and a reinforcing agent, the viscosity of the rubber composition increases with the progress of bonding between the polymer and the reinforcing agent. Such an increase in viscosity may be a factor that hinders workability, storage stability, and processability of the rubber composition during tire production, and therefore, it is important to suppress it at an appropriate level.

Specifically, when the Mooney viscosity of the rubber composition for a tire is more than 100, it may cause a deterioration in workability, storage stability and workability. Therefore, by using the above-mentioned end-modified conjugated diene polymer, Can be adjusted to a range of 80-100.

Method for producing end-modified conjugated diene-based polymer

According to another aspect of the present invention, there is provided a method for producing a living polymer, comprising: (a) synthesizing a living polymer by polymerizing at least one monomer of a conjugated diene monomer and an aromatic vinyl monomer in the presence of a solvent, a Lewis base and an organometallic compound; And (b) adding a compound represented by the following formula (2) to the living polymer to denature the end of the living polymer. The present invention also provides a method for producing an end-modified conjugated diene polymer.

(2)

In Formula 2, R ¹ and R ² are each C ₁ to C and ₂₀ hydrocarbon chain or a hydrocarbon chain containing a heteroatom in the C ₁ to C ₂₀ in a hydrocarbon of R ³ to R ⁵ are C ₁ to C _20, respectively Chain, and a and b may each be an integer of 0 to 2.

The step (a) is a step of synthesizing a living polymer according to a conventional solution polymerization method. Specifically, solution polymerization can be carried out in the presence of a solvent, a Lewis base and an organometallic compound, and a conjugated diene-based monomer or a mixture of a conjugated diene-based monomer and an aromatic vinyl-based monomer can be used as the monomer.

Wherein the conjugated diene monomer is at least one member selected from the group consisting of 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 1,3-hexadiene, 2,3- Composed of phenyl-1,3-butadiene, 3-methyl-1,3-pentadiene, 2-chloro-1,3-butadiene, piperylene, And preferably, 1,3-butadiene, isoprene, or 2,3-dimethyl-1,3-butadiene, but is not limited thereto.

Wherein the aromatic vinyl monomer is at least one selected from the group consisting of styrene,? -Methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,4- diisopropylstyrene, Butylstyrene, 4-tert-butylstyrene, 4-tert-butylstyrene, 4-tert-butylstyrene, 4- Styrene, N, N -dimethylaminoethylstyrene, 1-vinyl-5-hexylnaphthalene, 1-vinylnaphthalene, divinylnaphthalene, divinylbenzene, trivinylbenzene, vinylbenzyldimethylamine, (4-vinylbenzyl) dimethylamino And at least one member selected from the group consisting of vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, vinylidene chloride, And preferably, it may be styrene or? -Methylstyrene, but is not limited thereto.

When the conjugated diene polymer chain comprises the conjugated diene monomer and the aromatic vinyl monomer, the weight ratio of the conjugated diene monomer: aromatic vinyl monomer is 55 wt% to 95 wt%: 5 wt% to 45 wt% %. ≪ / RTI >

The solvent usable in the solution polymerization may be one selected from the group consisting of aliphatic hydrocarbon series, cyclic aliphatic hydrocarbon series, aromatic hydrocarbon series, and mixtures of two or more thereof, preferably n-pentane, n -Hexane, n-heptane, isooctane, cyclohexane, toluene, benzene, xylene, and mixtures of two or more thereof. More preferably, it may be cyclohexane But is not limited thereto.

The monomers may be included in the solvent in an amount of 5% by weight to 40% by weight, preferably 10% by weight to 25% by weight. If the content of the monomer in the solvent is less than 5% by weight, excessive use of the solvent may result in a decrease in the production yield, which may increase the production cost. If the content exceeds 40% by weight, .

The Lewis base is a substance used for controlling the microstructure of the polymer, and may be selected from the group consisting of tetrahydrofuran, di-n-propyl ether, diisopropyl ether, diethyl ether, diethylene glycol dimethyl ether, N, N, N < / RTI > (N, N-diethylaminopropyl) -Tetramethylethylenediamine, and mixtures of two or more thereof. Preferably, it is selected from the group consisting of ethyltetrahydrofurfuryl ether, tetrahydrofuran, ditetrahydrofurfuryl propane, ditetrahydrofuran, Furyl propane, or N, N, N, N -tetramethylethylenediamine, but is not limited thereto. The dosage of the Lewis base may be adjusted according to the molar number of the total anion and the vinyl content in the target conjugated diene compound at the initiation temperature condition.

The organometallic compound serving as the polymerization initiator in the step (a) may be at least one selected from the group consisting of organolithium compounds, organic sodium compounds, organic potassium compounds, organic rubidium compounds and organic cesium compounds, , It may be an organic lithium compound, and more preferably an alkyl lithium compound having an alkyl group having 1 to 20 carbon atoms.

The alkyllithium compound which can be used may be one selected from the group consisting of methyllithium, ethyllithium, isopropyllithium, n-butyllithium, sec-butyllithium, tert-butyllithium and mixtures of two or more thereof , Preferably n-butyllithium or sec-butyllithium, but is not limited thereto. The amount of the organometallic compound to be used may vary depending on the target molecular weight of the produced polymer, but may be generally from 0.01 mmol to 10 mmol, preferably from 0.1 mmol to 3.0 mmol, based on 100 g of the monomer.

The initiation temperature of the polymerization reaction in the solution polymerization in the step (a) may be about 10 캜 to 100 캜, and preferably about 20 캜 to 90 캜. If the initiation temperature is less than 10 ° C, the viscosity of the solution increases sharply as the reaction progresses and the reaction rate decreases. This is economically disadvantageous, and if it exceeds 100 ° C, it may be difficult to control the reaction temperature. The reaction pressure may be 0.5 kgf / cm 2 to 10 kfg / cm 2. Generally, the polymerization reaction can be carried out for a sufficient time until all of the monomers are converted into the copolymer, that is, from 20 minutes to 200 minutes until the desired conversion rate is achieved.

Next, the step (b) is a step of reacting the living polymer formed in the step (a) and the alkoxysilane compound represented by the formula (2) to denature the end of the living polymer.

The alkoxysilane compound represented by Formula 2 may be prepared according to the following Scheme 1 or Scheme 2 according to the value of integer b. To a hydrocarbon chain containing a heteroatom in Scheme 1 and Scheme 2 R ¹ and R ² are C ₁ to C ₂₀ hydrocarbon chain or a C ₁ to C _20, respectively, R ³ to R ⁵ are C ₁ to C _20, respectively Lt; / RTI >

[Reaction Scheme 1]

First, when the integer b is 2, the alkoxysilane compound according to one embodiment can be prepared by the nucleophilic substitution reaction represented by the reaction formula 1 in the presence of a base. At this time, in consideration of the reactivity of the bromine compound used, the reaction should be performed at a low temperature when the reactant is added, and the subsequent reaction temperature may be adjusted within a range of -10 ° C to 150 ° C.

As the base, a hydride, hydroxide, carbonate, bicarbonate, or amine of an alkali metal or an alkaline earth metal can be used. Preferably, an amine base can be used. As the reaction solvent, a polar organic solvent such as dimethylformaldehyde or tetrahydrofuran may be used so as to increase the solubility of the reaction product.

[Reaction Scheme 2]

When the integer b is 1 or 2, an alkoxysilane compound according to another embodiment can be prepared by adding an peroxide to the product of the reaction formula 1 and performing an epoxidation reaction represented by the reaction formula 2 have. At this time, depending on the progress of the epoxidation reaction, some or all of the double bonds may exist in the form of a mixture in which epoxidized compounds are mixed. The peroxide may be at least one selected from the group consisting of meta-chloroperoxybenzoic acid (m-CPBA), magnesium monoperoxyphthalate (MMPP), and dimethyldioxirane (DMDO), but is not limited thereto .

The alkoxysilane compound represented by Formula 2 may be used in an amount of 0.5 to 3.0 moles per mole of the organometallic compound. If the relative amount of the organometallic compound relative to 1 mole of the organometallic compound is less than 0.5 mole, the end-modification effect of the living polymer may be insufficient. If the amount is more than 3.0 moles, the modifier may be excessively used.

In the step (b), the reaction temperature may be 30 ° C to 200 ° C, preferably 50 ° C to 110 ° C. If the reaction temperature is less than 30 ° C, the reaction proceeds and the viscosity of the solution rises and the reaction rate may decrease. If the reaction temperature exceeds 200 ° C, the living polymer may undergo self-coupling reaction and the terminal modification effect by the alkoxysilane compound may be weak have.

On the other hand, by adding the coupling agent before the end of the living polymer is denatured in the step (b) to increase the proportion of the chain terminal which can be imparted with a functional group upon terminal modification of the living polymer, The compatibility, affinity and reactivity with a reinforcing agent such as silica and carbon black can be further improved during production.

As the coupling agent, at least one of an organic material such as a polyvinyl aromatic compound and an inorganic material such as tin tetrachloride (SnCl ₄ ) may be used. The polyvinylaromatic compound may be, for example, o-, m-, and p-divinylbenzene, o-, m- and p-diisopropenylbenzene, 1,2,4- 2-vinyl-3,4-dimethylbenzene, 1,3-divinylnaphthalene, 1,3,5-trivinylnaphthalene, 2,4-divinylbiphenyl, 3,5,4'- 1,2-divinyl-3,4-dimethylbenzene, 1,5,6-trivinyl-3,7-diethyl naphthalene, and mixtures thereof. Preferably, Divinylbenzene, diisopropenylbenzene, and mixtures of o-, m-, and p-isomers thereof, but is not limited thereto.

Hereinafter, embodiments of the present invention will be described in detail.

Example 1

A 5 L glass reactor was charged with 88 g of styrene, 307 g of 1,3-butadiene, 2,200 g of cyclohexane and 4 mL of tetrahydrofuran, and the temperature inside the reactor was adjusted to 30 ° C with stirring. When the internal temperature of the reactor reached 30 캜, 2.4 mmol of n - butyllithium as a polymerization initiator was administered and the adiabatic temperature - raising polymerization reaction proceeded. At this time, the progress of the polymerization reaction was observed through the change of the reaction temperature, and a small amount of reactants were sampled to analyze the monomer ratio and the reaction conversion ratio.

When the reaction temperature reached the peak, 5 g of 1,3-butadiene was further added to replace the reaction end with butadiene. When the additional administration of 1,3-butadiene was completed and the temperature was no longer elevated, 3 mmol of a coupling agent, divinylbenzene, was added and the coupling reaction was carried out for 5 minutes. Thereafter, 2.7 mmol of N, N -diallylaminopropyltrimethoxysilane as a terminal modifier was added, and after the end denaturation was completed by allowing to stand for a predetermined time, 2 g of butylated hydroxyl toluene as an antioxidant was administered The reaction was terminated, stripped and roll dried to remove residual solvent and water to give a polymer.

Example 2

A polymer was obtained in the same manner as in Example 1 except that 0.07 mmol of coupling zero tin tetrachloride was administered and 2.4 mmol of N, N -diallylaminopropyltrimethoxysilane was administered as a terminal modifier.

Example 3

A polymer was obtained in the same manner as in Example 1, except that 2.4 mmol of N, N -diglycidoxypropyltrimethoxysilane was administered as a terminal modifier.

Example 4

Except that 2.4 mmol of a mixture of N, N -diallylaminopropyltrimethoxysilane and N, N -diglycidoxypropyltrimethoxysilane in a molar ratio of 1: 1 was used as the end modifier. The polymer was obtained in the same manner as in Example 1.

Comparative Example 1

A polymer was obtained in the same manner as in Example 1, except that 2.4 mmol of N, N -dimethylaminopropyltrimethoxysilane was administered as a terminal modifier.

Comparative Example 2

As a rubber composition for a tire, NS612 of a commercial product, ZEON Chemicals, was used.

The characteristics of the respective end-modified copolymers prepared in Examples 1 to 4 and Comparative Example 1 are shown in Table 1 below. In Table 1, styrene content and vinyl content are calculated in terms of mol% using NMR analysis results, and the weight average molecular weight is specified by GPC (gel permeation chromatography).

division Coupling ratio (%) Weight average molecular weight (Mw) Mooney viscosity
(ML1 + 4, 100 DEG C) Styrene content (mol%) Vinyl content in BD unit (mol%) Example 1 38 224,000 64 28.7 58.4 Example 2 36 209,000 62 29.0 58.8 Example 3 35 213,000 63 29.2 58.4 Example 4 39 215,000 65 29.9 58.5 Comparative Example 1 37 203,000 65 29.0 58.6

Experimental Example: Evaluation of Physical Properties of Rubber Composition for Tire

Each of the copolymers prepared according to Examples 1 to 4 and Comparative Example 1 was blended with silica in a 500 cc lab mixer according to the conditions shown in Table 2 below to prepare a rubber composition for a tire.

Composition Content (phr) Solution SBR 80 High cis BR 20 Stearic acid 2 ZnO ₂ 3 Silica 80 Aromatic oil 10 Si-69 6.4 CZ One DPG 1.5 Sulfur 1.5 - Solution SBR: The copolymer obtained in Examples 1 to 4 and Comparative Example 1
- High cis BR: KBR01 (KKPC)
- Si-69: bis- (triethoxysilylpropyl) tetrasulfide
- CZ: N -cyclohexylbenzothiazyl sulfenamide
- DPG: 1,3-diphenylguanidine

The processability, mechanical properties and dynamic properties of the rubber compositions for tires according to Examples 1 to 4 and Comparative Examples 1 to 2 were measured and compared. The results are shown in Table 3 below. The method of measuring the physical properties is as follows.

- Hardness: Measured using SHORE-A hardness meter

- Tensile strength, 300% modulus and elongation: Measured using universal test machine (UTM) according to ASTM 3189 Method B method

- Tan δ, which is the dynamic property value of vulcanized rubber, is analyzed using a DMTA 5 instrument from Rheometic at a frequency of 10 Hz and a strain of 0.2

Properties division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Processability Mooney viscosity (100 DEG C) 96 89 87 90 101 87 Minimum torque (dNm) 6.62 8.27 6.77 6.27 5.4 5.3 Maximum torque (dNm) 32.76 32.26 33.35 33.26 31.08 30.69 Δ torque (maximum torque - minimum torque) 26.14 23.99 26.58 24.99 25.68 25.31 Mechanical properties Hardness (SHORE-A) 69 61 64 65 67 65 Tensile strength (kgf / cm2) 217.0 197.2 206.8 209.3 191.5 194.4 300% modulus (kgf / cm2) 87.2 79.7 83.3 87.2 79.3 81.8 Elongation (%) 590.2 532.9 582.4 592.0 598.2 583.9 Wear Index (DIN) 118 107 118 121 100 107 Dynamic property Tg (占 폚) -48.6 -46.6 -47.6 -48.2 -47.1 -49.3 Tanδ at Tg 0.78867 0.75673 0.75773 0.7732 0.7507 0.69547 Tanδ at 0 占 폚 (wetting resistance) 0.2017 0.19785 0.18852 0.19781 0.18165 0.17122 Tanδ at 60 ° C (rotation resistance) 0.09556 0.10301 0.10154 0.09890 0.12344 0.11782

Referring to Table 3, the rubber compositions containing the copolymers of Examples 1 and 2 containing an allyl group at the end had higher tensile strengths, which were mechanical properties than those of Comparative Examples 1 and 2, , Respectively. This is attributed to the fact that the allyl group contained in the end modifier contributed to the crosslinking during the rubber composition formulation, thereby increasing the strength of the rubber compound. In addition, it is shown that the wet resistance, which is a dynamic property, is increased and the rotational resistance is reduced, which shows that the effect is improved in terms of safety and fuel economy.

On the other hand, the rubber composition containing the copolymer of Example 3 containing an epoxy group at the end had the tensile strength and the wear index, which are mechanical properties, and the wet resistance and the rotational resistance, which are dynamic properties, as compared with those of Comparative Examples 1 and 2, And 2, indicating that the mechanical and dynamic properties were improved.

Particularly, the rubber composition containing the copolymer of Example 3 showed a decrease in the Mooney viscosity as compared with those of Example 1 and Comparative Example 1. As a result, the rubber composition containing the copolymer containing an epoxy group at the terminal Can be confirmed to show an improved effect in terms of processability.

Further, the rubber composition containing the copolymer of Example 4 containing both the allyl group and the epoxy group at the end had both mechanical properties such as tensile strength and abrasion index, dynamic properties such as wetting resistance and rotational resistance as compared with those of Comparative Examples 1 and 2 And the Mooney viscosity was reduced in comparison with those of Example 1 and Comparative Example 1, indicating an improvement in the processability.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (9)

An end-modified conjugated diene polymer, which is a polymer represented by the following formula (1)
[Chemical Formula 1]

In Formula 1,
wherein p is a conjugated diene polymer chain, R ¹ and R ² are each C ₁ to a hydrocarbon chain or a hydrocarbon chain containing a heteroatom in the C ₁ to C ₂₀ of the C _20, R ³ and R ⁴ are each C ₁ to a hydrocarbon chain of ₂₀ C, an integer of 0 to 2, a and b, respectively.
The method according to claim 1,
Wherein the conjugated diene-based polymer chain is a polymer chain comprising conjugated diene-based monomers.
3. The method of claim 2,
Wherein the polymer chain is a copolymer chain further comprising an aromatic vinyl-based monomer.
A rubber composition for a tire, comprising the end-modified conjugated diene-based polymer according to any one of claims 1 to 3.
5. The method of claim 4,
Wherein the rubber composition for a tire has a Mooney viscosity of 80 to 100.
(a) synthesizing a living polymer by polymerizing at least one monomer selected from a conjugated diene monomer and an aromatic vinyl monomer in the presence of a solvent, a Lewis base, and an organometallic compound; And
(b) modifying the end of the living polymer by adding a compound represented by the following formula (2) to the living polymer:
(2)

In Formula 2,
R ¹ and R ² are each a C ₁ to C ₂₀ hydrocarbon chain or a hydrocarbon chain containing a C ₁ to C ₂₀ hetero atom, R ³ to R ⁵ are each a C ₁ to C ₂₀ hydrocarbon chain, and a and and b is an integer of 0 to 2, respectively.
The method according to claim 6,
Wherein the organometallic compound is used in an amount of 0.01 to 10 mmol based on 100 g of the monomer.
The method according to claim 6,
Wherein the organometallic compound is at least one selected from the group consisting of an organic lithium compound, an organic sodium compound, an organic potassium compound, an organic rubidium compound and an organic cesium compound.
The method according to claim 6,
Wherein the molar ratio of the organometallic compound to the compound represented by the formula (2) is 1: 0.5 to 3.0.