KR20210061262A - Novel elastic copolymer and its preparation method - Google Patents

Abstract

The present invention relates to a novel elastic copolymer having improved bonding strength with a silica filler compared to a conventional ethylene-propylene-diene (EPDM) elastic copolymer, and to a preparation method thereof. The elastic copolymer comprises an ethylene-derived repeating unit, a propylene-derived repeating unit, and a repeating unit represented by following chemical formulas 1 and 2.

Description

Novel elastomer copolymer and its manufacturing method TECHNICAL FIELD [NOVEL ELASTIC COPOLYMER AND ITS PREPARATION METHOD]

The present invention relates to a novel elastomeric copolymer having increased bonding strength with a silica filler and a method for producing the same.

EPDM rubber, a ternary elastomer copolymer of alpha olefins such as ethylene and propylene, and diene such as ethylidene norbornene, has a molecular structure that does not have an unsaturated bond in the main chain, and weather resistance, chemical resistance, and heat resistance are more than that of general conjugated diene rubber. It has excellent properties. Due to these characteristics, ternary elastic copolymers such as EPDM rubber are widely used in various automobile parts materials, electric wire materials, construction and industrial materials such as various hoses, gaskets, belts, bumpers, or blends with plastics.

However, conventionally used EPDM has problems with compatibility with low polarity materials and oil resistance. In order to solve the above problem, for example, research has been conducted to prepare a polar polymer such as modifying a terminal vinyl group using a Grubbs catalyst or introducing an ester group at an allylic position.

On the other hand, EPDM rubber is mainly used with inorganic fillers, particularly silica, so that the necessity of strengthening the bonding strength with inorganic fillers has emerged in order to improve its usability. The modification of the vinyl group or the introduction of the ester group as described above is not sufficient to increase the bonding strength.

The present invention relates to a novel elastomeric copolymer in which processability is improved by increasing the bonding strength with a silica filler compared to the conventional ethylene-propylene-diene (EPDM) elastomeric copolymer, and a method for producing the same.

The present invention comprises a repeating unit derived from ethylene, a repeating unit derived from propylene, and a repeating unit represented by the following Chemical Formulas 1 and 2,

Provides an elastomeric copolymer:

[Formula 1]

[Formula 2]

In Formula 1 and Formula 2,

R ₁ is hydrogen, substituted or unsubstituted C _1-20 alkyl, substituted or unsubstituted C _3-20 cycloalkyl, or substituted or unsubstituted C _2-20 alkenyl,

R ₂ to R ₄ are each independently hydrogen or substituted or unsubstituted C _1-20 alkyl.

In addition, the present invention comprises the steps of forming an ethylene-propylene-diene (EPDM) elastomer copolymer by copolymerizing ethylene, propylene, and a diene-based monomer represented by the following Chemical Formula 3; And

Including the step of reacting the ethylene-propylene-diene (EPDM) elastomer copolymer and the compound represented by the following formula (4) using a platinum (Pt) catalyst,

It provides a method for preparing the above elastomeric copolymer:

[Formula 3]

[Formula 4]

HSi(OR ₁ ) ₃

In Chemical Formulas 3 and 4, R ₁ to R ₄ are as defined in Chemical Formulas 1 and 2.

According to the present invention, compared to the existing ethylene-propylene-diene (EPDM) elastomer, an alkoxysilane group is introduced to have improved hydrophilicity and chemical bonding with inorganic fillers is possible, thereby improving processability. And a method of manufacturing the same may be provided.

Hereinafter, an elastic copolymer according to a specific embodiment of the present invention and a method of manufacturing the same will be described in detail.

First, the term "elastomeric copolymer" used in the present specification may be defined as follows unless otherwise specified. The “elastomeric copolymer” may refer to any elastic copolymer (eg, a crosslinkable random copolymer) prepared by copolymerizing three or more monomers including ethylene, propylene, and diene. Representative examples of such “elastomeric copolymers” include copolymers of ethylene, propylene and diene, or copolymers prepared by performing an additional step on such a copolymer. However, this "elastic copolymer" does not refer to only a copolymer of three monomers, and is prepared by copolymerizing one or more monomers belonging to the category of diene together with the ethylene and propylene, and optionally performing an additional reaction step. It goes without saying that any elastomeric copolymer may be included. For example, ethylene, propylene, 5-vinyl-2-norbornene (VNB) and 2-ethylidene-5-norbornene (ENB) two kinds of dienes are copolymerized and further reaction proceeds to prepare Elastomeric copolymers may also belong to the category of the "elastomeric copolymer".

In the present specification, the term "substituted or unsubstituted" refers to deuterium; Halogen group; Nitrile group; Nitro group; Hydroxy group; Carbonyl group; Ester group; Imide group; Amino group; Phosphine oxide group; Alkoxy group; Aryloxy group; Alkyl thioxy group; Arylthioxy group; Alkyl sulfoxy group; Arylsulfoxy group; Silyl group; Boron group; Alkyl group; Cycloalkyl group; Alkenyl group; Aryl group; Aralkyl group; Aralkenyl group; Alkylaryl group; Alkylamine group; Aralkylamine group; Heteroarylamine group; Arylamine group; Arylphosphine group; Or it means substituted or unsubstituted with one or more substituents selected from the group consisting of a heterocyclic group containing one or more of N, O, and S atoms, or substituted or unsubstituted with two or more substituents connected among the above-exemplified substituents. . For example, "a substituent to which two or more substituents are connected" may be a biphenyl group. That is, the biphenyl group may be an aryl group or may be interpreted as a substituent to which two phenyl groups are connected.

In the present specification, the alkyl group may be linear or branched, and the number of carbon atoms is not particularly limited, but is preferably 1 to 20. According to an exemplary embodiment, the alkyl group has 1 to 10 carbon atoms. According to another exemplary embodiment, the alkyl group has 1 to 5 carbon atoms. Specific examples of the alkyl group include methyl, ethyl, propyl, n-propyl, isopropyl, butyl, n-butyl, isobutyl, tert-butyl, sec-butyl, 1-methyl-butyl, 1-ethyl-butyl, pentyl, n -Pentyl, isopentyl, neopentyl, tert-pentyl, hexyl, n-hexyl, 1-methylpentyl, 2-methylpentyl, 4-methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, heptyl , n-heptyl, 1-methylhexyl, cyclopentylmethyl, cyclohexylmethyl, octyl, n-octyl, tert-octyl, 1-methylheptyl, 2-ethylhexyl, 2-propylpentyl, n-nonyl, 2,2 -Dimethylheptyl, 1-ethyl-propyl, 1,1-dimethyl-propyl, isohexyl, 2-methylpentyl, 4-methylhexyl, 5-methylhexyl, and the like, but are not limited thereto.

The cycloalkyl may be a cyclic alkyl. Specifically, the C _3-20 cycloalkyl is a C _3-20 cyclic alkyl; C _3-15 cyclic alkyl; Or C _3-10 cyclic alkyl. More specifically, cyclopropyl, cyclobutyl, cyclopentyl, 3-methylcyclopentyl, 2,3-dimethylcyclopentyl, cyclohexyl, 3-methylcyclohexyl, 4-methylcyclohexyl, 2,3-dimethylcyclohexyl, 3,4,5-trimethylcyclohexyl, 4-tert-butylcyclohexyl, cycloheptyl, cyclooctyl, and the like, but are not limited thereto.

The alkenyl may be linear, branched or cyclic alkenyl. Specifically, the C _2-20 alkenyl is C _2-20 straight chain alkenyl, C _2-10 straight chain alkenyl, C _2-5 straight chain alkenyl, C _3-20 branched alkenyl, C _3-15 branched chain Alkenyl, C _3-10 branched chain alkenyl, C _5-20 cyclic alkenyl or C _5-10 cyclic alkenyl. More specifically, C _2-20 alkenyl may be ethenyl, propenyl, butenyl, pentenyl or cyclohexenyl, but is not limited thereto.

On the other hand, according to one embodiment of the invention, there is provided an elastomeric copolymer comprising a repeating unit derived from ethylene, a repeating unit derived from propylene, and a repeating unit represented by the following Formulas 1 and 2:

[Formula 1]

[Formula 2]

In Formula 1 and Formula 2,

R ₁ is hydrogen, substituted or unsubstituted C _1-20 alkyl, substituted or unsubstituted C _3-20 cycloalkyl, or substituted or unsubstituted C _2-20 alkenyl,

R ₂ to R ₄ are each independently hydrogen or substituted or unsubstituted C _1-20 alkyl.

Conventional elastomers have compatibility with low polarity materials and oil resistance, so that bonding with inorganic fillers is weak. In order to improve the bonding strength with the inorganic filler, the more polar it is, the more advantageous, the inventors of the present invention introduce an alkoxysilyl group into the elastic copolymer to enable chemical bonding with an inorganic filler mainly represented by silica.

Accordingly, the elastic copolymer of one embodiment has a structure in which an alkoxysilyl group is introduced at the end of the repeating unit of Formula 1 and/or Formula 2. Since the above structure can be prepared by further introducing an alkoxysilyl group to the existing EPDM elastic copolymer having an unsaturated double bond at the end of the repeating unit, the repeating unit of Formula 1 or the formula A repeating unit of 2 is formed. Accordingly, the elastic copolymer may have a structure including a repeating unit derived from ethylene, a repeating unit derived from propylene, and the repeating units of Formulas 1 and 2 into which a terminal alkoxysilyl group is introduced. The introduction of the alkoxysilyl group improves the bonding strength of the elastic copolymer with the silica filler, thereby improving processability.

Preferably, the molar ratio of the repeating unit of Formula 1 and the repeating unit of Formula 2 may be 0.1:99.9 to 99.9:0.1, or 1:99 to 99:1, or 10:90 to 90:10.

Preferably, R ₁ may be hydrogen, substituted or unsubstituted C _1-10 alkyl, substituted or unsubstituted C _3-10 cycloalkyl, or substituted or unsubstituted C _2-10 alkenyl,

More preferably, R ₁ may be methyl, ethyl, or isopropyl.

Preferably, R ₂ to R ₄ may each independently be hydrogen or a substituted or unsubstituted C _1-10 alkyl,

More preferably, each of R ₂ to R ₄ may be hydrogen.

As an example, the elastic copolymer having the repeating units of Formulas 1 and 2 is prepared by copolymerizing ethylene, propylene and 5-vinyl-2-norbornene (VNB) to prepare an EPDM copolymer, and then introducing an alkoxysilyl group. It may correspond to the elastic copolymer prepared by proceeding.

The elastic copolymer may include 40 to 70 mol% of repeating units derived from ethylene, 15 to 55 mol% of repeating units derived from propylene, and 0.5 to 20 mol% of repeating units of Formula 1 and Formula 2.

Preferably, the content of the repeating unit of Formula 1 and the repeating unit of Formula 2 among the total repeating units of the elastic copolymer may be 2 mol% to 20 mol%. The repeating unit of Formula 1 and the repeating unit of Formula 2 can be prepared by reacting a diene-based monomer represented by Formula 3 to be described later with a silane compound represented by Formula 4, and repeating the repeating unit of Formula 1 and Formula 2 The unit is determined according to the content of the diene-based monomer represented by Formula 3 used in the manufacture of the elastic copolymer. When the content of the repeating unit of Formula 1 and the repeating unit of Formula 2 is less than the above range, the bonding strength between the elastic copolymer and the silica filler is weak, and when it exceeds the above range, the processability of the elastic copolymer bonded with the silica filler decreases. have.

The elastic copolymer may have a weight average molecular weight (Mw) measured by GPC of 100,000 to 500,000, or 200,000 to 400,000 g/mol.

In the present invention, the number average molecular weight (Mn), weight average molecular weight (Mw), and molecular weight distribution are determined by using gel permeation chromatography (GPC) to determine the weight average molecular weight (Mw) and number average molecular weight (Mn) of the elastomer. Each is measured, and the ratio (Mw/Mn) of the weight average molecular weight to the number average molecular weight is calculated as a molecular weight distribution.

Specifically, the elastomer sample was pretreated by dissolving it for 10 hours at 160° C. in 1,2,4-Trichlorobenzene containing 0.0125% by weight of BHT using PL-SP260, and then using a Polymer Laboratories PLgel MIX-B 300mm length column. Then, it is evaluated using the Waters PL-GPC260 instrument. The evaluation temperature is 160°C, 1,2,4-trichlorobenzene is used as a solvent, and the flow rate is measured at a rate of 1 mL/min. The sample is prepared to a concentration of 10 mg/10 mL, and then supplied in an amount of 200 μL. The values of Mw and Mn are determined using a calibration curve formed using polystyrene standards. The molecular weight of polystyrene standards is 2,000 / 10,000 / 30,000 / 70,000 / 200,000 / 700,000 / 2,000,000 / 4,000,000 / 10,000,000.

Since the above-described elastic copolymer exhibits excellent compatibility with other polar components, particularly inorganic fillers, compared to the existing EPDM rubber, it can be very preferably applied to the manufacture of various elastomers or products to which EPDM rubber has been applied.

For example, the elastomeric copolymer can be used in various products and uses such as various automobile parts materials, wire materials, construction and various hoses, gaskets, sealing materials, roofing materials, belts, bumpers, or industrial materials such as blends with plastics. have.

Meanwhile, the above-described elastic copolymer may be prepared by preparing an existing EPDM copolymer and then additionally performing a step of introducing an alkoxysilyl group thereto. Accordingly, according to an embodiment of the present invention, a method of manufacturing the elastic copolymer is provided.

The manufacturing method includes the steps of copolymerizing ethylene, propylene, and a diene-based monomer represented by the following Chemical Formula 3 to form an ethylene-propylene-diene (EPDM) elastomer; And

The ethylene-propylene-diene (EPDM) elastomer copolymer and the compound represented by the following Formula 4 may include reacting using a platinum (Pt) catalyst:

[Formula 3]

[Formula 4]

HSi(OR ₁ ) ₃

In Formulas 3 and 4, R ₁ to R ₄ are as defined in Formulas 1 and 2.

In the above production method, the step of introducing the alkoxysilyl group described above corresponds to the step of reacting the EPDM elastomer and the compound represented by Formula 4 using a platinum catalyst. In this way, an EPDM copolymer was prepared using a diene-based monomer having ethylene, propylene and norbornene rings, and then, by introducing an alkoxysilyl group, an elastomeric copolymer of one embodiment capable of bonding with an inorganic filler at the end of the diene-derived repeating unit was prepared. Can be.

In the above production method, ethylene, propylene, and a diene-based monomer represented by the following formula (3) are copolymerized to form an EPDM elastomer copolymer. In this case, the monomer of Formula 3 may include 5-vinyl-2-norbornene (VNB). Preferably, the monomer of Formula 3 may be 5-vinyl-2-norbornene (VNB).

The EPDM elastic copolymer may be prepared by copolymerizing each of the above-described monomers in the presence of a Ziegler-Natta catalyst system or a metallocene catalyst system according to a conventionally well-known method for preparing EPDM rubber. The copolymerization step may be performed at about 85° C. to 170° C., or about 85° C. to 160° C. If the copolymerization temperature is too low, it may be difficult to synthesize a ternary elastomer in which three kinds of monomers are uniformly alternately distributed, and if the polymerization reaction temperature is too high, the monomer or the prepared copolymer may be thermally decomposed. In addition, such copolymerization can be carried out by a solution polymerization method. At this time, the catalyst composition described above may be used in the form of a homogeneous catalyst dissolved in such a solution.

The manufacturing method, catalyst, polymerization conditions, etc. of the EPDM elastomer are not particularly limited, and the manufacturing conditions of EPDM rubber well known through various documents such as Registered Patent Publication No. 1391692 or Registered Patent Publication No. 1391693 are followed. I can. Additional descriptions regarding this will be omitted.

Meanwhile, after copolymerizing each of the monomers to form an EPDM elastomer, the alkoxysilyl group of Formula 4 is introduced into the alkenyl end of the repeating unit derived from the monomer of Formula 3 in the presence of a platinum (Pt) catalyst. I can. The platinum catalyst is not particularly limited as long as it is used for the introduction of alkoxysilyl, but as an example, _{a platinum catalyst of Pt0 2} or H ₂ PtCl ₆ (Chloroplatinic acid) may be used.

In the step of introducing the alkoxysilyl group, a solvent may be used within a range that does not affect the effects of the present invention. The solvent that can be used is not particularly limited, but preferably, an aliphatic hydrocarbon solvent such as hexane or heptane, or an aromatic hydrocarbon solvent such as benzene, toluene, or xylene, or methyl isobutyl ketone, 1-methyl-2-pyrrolidinone, and cyclo Ketone solvents such as hexanone and acetone, ether solvents such as tetrahydrofuran, isopropyl ether, propylene glycol propyl ether, acetate solvents such as ethyl acetate, butyl acetate, and propylene glycol methyl ether acetate, or isopropyl alcohol, butyl Alcohol-based solvents such as alcohol, amide-based solvents such as dimethylacetamide and dimethylformamide, or silicone-based solvents, or a mixture thereof may be used.

Hereinafter, a preferred embodiment is presented to aid the understanding of the present invention. However, the following examples are provided for easier understanding of the present invention, and the contents of the present invention are not limited thereto.

Preparation Example 1: Preparation of ethylene, propylene and 5-vinyl-2-norbornene (VNB) elastomer copolymer (comparative copolymer 1)

Using a 2L pressure reactor, a three-way copolymerization reaction of ethylene, propylene and 5-vinyl-2-norbornene (VNB) was continuously performed.

As an organometallic compound (catalyst), a metallocene compound ([4,4'-(C ₆ H ₄ ) ₂ (C ₅ Me ₄ ) ₂ ][{N=C(2,6-F ₂ Ph)N(iPr ) ₂ }TiMe ₂ ] ₂ ) 1 μmol was used, and 3 μmol of methylaluminoxane (MMAO), N,N-dimethylanilinium tetrakis (pentafluorophenyl) borate 5 μmol was used as a cocatalyst compound in 5 ml Toluene It was used in a dissolved state.

440 g of hexane as a polymerization solvent was added to the reactor, 25 to 100 g of propylene as a monomer, and 1 to 20 g of 5-vinyl-2-norbornene (VNB) were added to the reactor, and ethylene was 7.5 to 10 While continuously supplied to the bar, the copolymerization was carried out. The specific contents of ethylene, propylene, and VNB are shown in Table 1 below.

The copolymerization reaction in the reactor was carried out for 10 minutes in the range of 90 °C and ethylene pressure of 9 bar, and after the copolymerization reaction, the polymer solution was recovered from the bottom of the reactor in ethanol solvent, and dried under reduced pressure in a vacuum oven at 60 °C for comparison. Copolymer 1 was obtained.

Preparation Example 2: Preparation of an elastic copolymer (Copolymer 1) into which a trimethoxy silane group was introduced

Comparative copolymer 1 (10 g) prepared in Preparation Example 1 and 250 mL of Xylene were diluted and stirred in a 1 L flask, and then 0.98 g of HSi (OMe), which is 2 equivalents of the content of the repeating unit derived from VNB contained in the elastomer ) ₃ (trimethoxysilane) and 0.01 equivalent of 20 mg of Pt/C were added at room temperature, raised to 100° C., and stirred for 24 hours. The polymer solution was recovered in an ethanol solvent and dried under reduced pressure in a vacuum oven at 60° C. to prepare an elastic copolymer (Copolymer 1) into which a trimethoxy silane group was introduced.

Preparation Example 3: Preparation of an elastic copolymer (Copolymer 2) into which a triethoxy silane group was introduced

A and the silane groups are introduced to the tree in the same manner as in Preparation Example 2 except that the Preparation 2 of the HSi (OMe) ₃ (trimethoxysilane) (triethoxysilane), HSi (OEt) ₃ in place of 1.3 g An elastic copolymer (copolymer 2) was prepared.

Preparation Example 4: Preparation of a triisopropoxy silane group-introduced elastic copolymer (Copolymer 3)

In the same manner as in Preparation Example 2, except that 1.65 g of HSi(OiPr) ₃ (triisopropoxysilane) was used instead of HSi(OMe) _{3 (trimethoxysilane) of Preparation Example 2, the triisopropoxy silane group was} Introduced An elastic copolymer (Copolymer 3) was prepared.

Examples 1 to 3 and Comparative Example 1

The copolymers of Examples 1 to 3 and Comparative Example 1 were kneaded through a first stage kneading and a second stage kneading to prepare a specimen. Specifically, in the first-stage kneading, EPDM, filler (silica), organosilane coupling agent, process oil, zinc agent, stearic acid, antioxidant, anti-aging agent, wax and accelerator are used using a Banbari mixer attached with a temperature control device. Kneaded. The content of each substance is shown in Table 1 below. At this time, the mixture was mixed from a starting temperature of 70° C. to 150° C. (takes about 4 minutes) at a rotor speed of 80 rpm, and mixing was continued for 5 minutes while maintaining the temperature at 150° C. The first blend thus obtained was sufficiently cooled at room temperature for at least 1 hour at a discharge temperature of 150° C. and then subjected to the second blend. In the second blending, the first blend and the sulfur and vulcanization accelerators of the contents shown in Table 1 were added to the kneader, and the specimens of Examples 1 to 3 and Comparative Example 1 were prepared through a curing process at 150° C. for 20 minutes.

division Raw material Content (parts by weight) 1st stage kneading EPDM 100 Silica 70 Coupling agent 11.2 Fair oil 25 Zinc agent 3 Stearic acid 2 Antioxidant 2 Anti-aging agent 2 Wax One Rubber accelerator 1.75 2nd stage kneading sulfur 1.5 Vulcanization accelerator 2

Experimental example

The physical properties of the specimens of Examples 1 to 3 and Comparative Example 1 were measured and shown in Table 2 below.

(1) Mw (g/mol), PDI

The elastomer samples prepared in Preparation Examples 1 to 4 were pretreated by dissolving them in 1,2,4-Trichlorobenzene containing 0.0125 wt% BHT for 10 hours at 160° C. using PL-SP260, and then using PL-GPC260. Mw (weight average molecular weight), Mn (number average molecular weight), and PDI (Polydispersity Index) were measured at a measurement temperature of 160° C., respectively.

(2) MV (Mooney viscosity) and ΔMV

For the specimens of Examples 1 to 3 and Comparative Example 1 in which each copolymer prepared in Preparation Examples 1 to 4 and silica were mixed, using a large rotor with Monsanto's MV2000E at 100° C. at a rotor speed of 2±0.02 rpm. Mooney viscosity (ML1+4, @100°C) (MU) was measured. The sample used at this time was left at room temperature (23±3°C) for at least 30 minutes, then 27±3 g was collected and filled inside the die cavity, and the Mooney viscosity was measured while applying a torque by operating a platen.

ΔMV is the difference in Mooney viscosity of the copolymer of Preparation Example before silica mixing and the copolymer of Example or Comparative Example in which silica is mixed. As an example, ΔMV of Comparative Example 1 in Table 2 below is a value obtained by subtracting the Mooney viscosity of Comparative Copolymer 1 of Preparation Example 1 from the Mooney viscosity of the specimen of Comparative Example 1.

Copolymer Mw PDI ΔMV In the copolymer
Repeat unit molar ratio
(Chemical Formula 1: Formula 2) In the copolymer
Formula 1 + Formula 2
Content of repeat units C2/C3 (mol%/mol%) Comparative Example 1 compare
Copolymer 1
(Production Example 1) 243,000 2.2 58 - 0 49/47 Example 1 Copolymer 1
(Production Example 2) 284,000 2.6 41 48:52 4 mol% 49/47 Example 2 Copolymer 2
(Production Example 3) 286,000 2.4 44 59:41 4 mol% 49/47 Example 3 Copolymer 3
(Production Example 4) 291,000 2.3 40 82:18 4 mol% 49/47

It can be seen that the ΔMV value of the EPDM (Preparation Examples 2 to 4) into which the silane functional group is introduced is lower than that of Comparative Example 1, and thus it can be confirmed that the bonding strength with the silica filler is improved and the processability is improved.

Claims (8)

Including a repeating unit derived from ethylene, a repeating unit derived from propylene, and a repeating unit represented by Formulas 1 and 2
Elastomer:
[Formula 1]

[Formula 2]

In Formula 1 and Formula 2,
R ₁ is hydrogen, substituted or unsubstituted C _1-20 alkyl, substituted or unsubstituted C _3-20 cycloalkyl, or substituted or unsubstituted C _2-20 alkenyl,
R ₂ to R ₄ are each independently hydrogen or substituted or unsubstituted C _1-20 alkyl.
The method of claim 1,
R ₁ is methyl, ethyl, or isopropyl,
Elastomeric copolymer.
The method of claim 1,
R ₂ to R ₄ are each hydrogen,
Elastomeric copolymer.
The method of claim 1,
40 to 70 mol% of repeating units derived from ethylene, 15 to 55 mol% of repeating units derived from propylene, and 0.5 to 20 mol% of repeating units of formulas 1 and 2,
Elastomeric copolymer.
The method of claim 1,
Of the total repeating units of the elastic copolymer, the content of the repeating unit of Formula 1 and the repeating unit of Formula 2 is 2 mol% to 20 mol%,
Elastomeric copolymer.
The method of claim 1,
The weight average molecular weight (Mw) measured by GPC is 100,000 to 500,000 g/mol,
Elastomeric copolymer.
Copolymerizing ethylene, propylene, and a diene-based monomer represented by the following Formula 3 to form an ethylene-propylene-diene (EPDM) elastomer copolymer; And
Including the step of reacting the ethylene-propylene-diene (EPDM) elastic copolymer and the compound represented by the following formula (4) using a platinum (Pt) catalyst,
The method for preparing the elastic copolymer of claim 1:
[Formula 3]

[Formula 4]
HSi(OR ₁ ) ₃
In Formulas 3 and 4, R ₁ to R ₄ are as defined in claim 1.
The method of claim 7,
The diene-based monomer represented by Formula 3 includes 5-vinyl-2-norbornene (VNB),
Method for producing an elastomeric copolymer.