KR100578094B1 - Tire rubber composition with improved anti-ageing property - Google Patents
Tire rubber composition with improved anti-ageing property Download PDFInfo
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- KR100578094B1 KR100578094B1 KR1020030066222A KR20030066222A KR100578094B1 KR 100578094 B1 KR100578094 B1 KR 100578094B1 KR 1020030066222 A KR1020030066222 A KR 1020030066222A KR 20030066222 A KR20030066222 A KR 20030066222A KR 100578094 B1 KR100578094 B1 KR 100578094B1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/005—Stabilisers against oxidation, heat, light, ozone
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3432—Six-membered rings
- C08K5/3437—Six-membered rings condensed with carbocyclic rings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/10—Copolymers of styrene with conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/12—Copolymers of styrene with unsaturated nitriles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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Abstract
본 발명은 노화방지 특성이 향상된 타이어용 고무조성물에 관한 것으로서 보다 상세하게는 타이어의 고무조성물에 노화방지 특성에 유리한 성분을 증가시킨 노화방지제를 첨가함으로써 노화방지 특성이 향상된 타이어용 고무조성물에 관한 것이다.The present invention relates to a rubber composition for tires with improved anti-aging characteristics, and more particularly, to a rubber composition for tires with improved anti-aging characteristics by adding an anti-aging agent having increased components favorable for anti-aging characteristics to the rubber composition of the tire. .
본 발명은 노화방지제인 2,2,4-트리메틸-1,2-디하이드로퀴놀린(TMDQ)을 함유한 타이어 고무의 노화방지 특성을 위해 노력하던 중 TMDQ의 성분에 따라 노화방지 특성을 살펴본바 TMDQ 성분 중 이량체가 많이 함유된 TMDQ 사용시 고무의 노화방지 특성이 향상됨을 알게 되었다.The present invention, while trying to anti-aging properties of the tire rubber containing 2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ) as an anti-aging agent looked at the anti-aging characteristics according to the components of TMDQ It was found that the anti-aging properties of rubber were improved when using TMDQ containing a lot of dimers.
따라서 본 발명은 타이어 고무조성물에 있어서 이량체 성분의 함량이 증가된 노화방지제인 TMDQ을 타이어용 고무조성물에 첨가하여 노화방지 특성이 향상된 타이어용 고무조성물의 제공을 목적으로 한다.Accordingly, an object of the present invention is to provide a rubber composition for tires having improved anti-aging characteristics by adding TMDQ, an anti-aging agent having an increased dimer content in a tire rubber composition, to a rubber composition for tires.
본 발명은 상기의 목적을 달성하기 위해 타이어용 고무조성물에 있어서, 노화방지제로서 이량체(dimer) 성분이 55∼70% 함유된 2,2,4-트리메틸-1,2-디하이드로퀴놀린(TMDQ)을 원료고무 100중량부에 대하여 0.5∼3.5중량부 포함한다.The present invention provides a 2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ) containing 55 to 70% of a dimer component as an anti-aging agent in a rubber composition for a tire in order to achieve the above object. ) 0.5 to 3.5 parts by weight based on 100 parts by weight of the raw material rubber.
Description
본 발명은 노화방지 특성이 향상된 타이어용 고무조성물에 관한 것으로서 보다 상세하게는 타이어의 고무조성물에 노화방지 특성에 유리한 성분을 증가시킨 노화방지제를 첨가함으로써 노화방지 특성이 향상된 타이어용 고무조성물에 관한 것이다.The present invention relates to a rubber composition for tires with improved anti-aging characteristics, and more particularly, to a rubber composition for tires with improved anti-aging characteristics by adding an anti-aging agent having increased components favorable for anti-aging characteristics to the rubber composition of the tire. .
노화방지제는 타이어를 포함하는 고무제품 제조시 첨가하는 구성성분의 일종으로 주로 노화에 의한 열화를 늦춰 제품의 수명을 연장하기 위해 사용하는 유기화합물이다.Antioxidant is an organic compound used to extend the life of products by delaying deterioration due to aging.
노화방지제는 산소, 오존, 열, 자외선, 습기 등의 노화 원인에 따라 여러 가지 종류가 있다. 보통 노화방지제라고 하면 산화와 열로부터 고무를 보호할 수 있는 것을 의미하며, 오존 노화방지제는 고무제품이 연신된 상태에서 오존을 함유한 공기에 노출되어 있을 때 오존에 의한 표면 균열을 방지하기 위해 사용한다.Antioxidants come in many varieties, depending on the causes of aging, such as oxygen, ozone, heat, ultraviolet light, and moisture. Normally, anti-aging agent means that rubber can be protected from oxidation and heat, and ozone anti-oxidant is used to prevent surface cracks caused by ozone when the rubber product is exposed to ozone-containing air in the stretched state. do.
이러한 노화방지제는 고무제품에 사용시 한 종류의 노화방지제를 사용하는 경우가 있으나 대부분의 경우에는 두 종류 이상의 노화방지제를 적의 선택하여 사용함으로써 고무 제품을 수명을 향상시키고 있다. Such anti-aging agents may use one type of anti-aging agent when used in rubber products, but in most cases, by using two or more types of anti-aging agents appropriately, the life of the rubber product is improved.
일반적으로 타이어용 고무는 산화와 열로부터 타이어를 보호할 수 있도록 하기 위해 노화방지제로서 2,2,4-트리메틸-1,2-디하이드로퀴놀린(2,2,4-trimethyl-1,2-dihydroquinoline, TMDQ)을 원료고무 100중량부에 대하여 1∼4중량부 정도 사용하고 있다. 그리고 타이어의 주 사용지역에 따라 오존, 자외선, 습기 등으로부터 타이어의 수명을 향상시키기 위해 오존 노화방지제, 자외선 노화방지제, 습기 노화방지제 등을 적의 선택하여 사용하고 있다. Generally, rubber for tires is used as an anti-aging agent to protect the tires from oxidation and heat, so that 2,2,4-trimethyl-1,2-dihydroquinoline (2,2,4-trimethyl-1,2-dihydroquinoline , TMDQ) is used in an amount of about 1 to 4 parts by weight based on 100 parts by weight of the raw material rubber. In addition, according to the main areas of use of tires, ozone anti-aging agent, ultraviolet anti-aging agent, moisture anti-aging agent, etc. are selected and used in order to improve the life of tire from ozone, ultraviolet ray, moisture, etc.
타이어 고무 제조시 주로 사용하는 노화방지제인 TMDQ는 보통 산촉매 하에서 아닐린과 아세톤의 축합반응으로 합성할 수 있으며, 현재 타이어 제조시 단량체(monomer) 함량이 25∼35%, 이량체(dimer) 함량이 40∼50%, 폴리머(polymer) 함량이 25∼35%인 TMDQ을 사용하고 있다.TMDQ, an anti-aging agent mainly used in the manufacture of tire rubber, can be synthesized by the condensation reaction of aniline and acetone under an acid catalyst, and at present, the monomer content is 25-35% and the dimer content is 40 TMDQ with -50% and polymer content of 25-35% is used.
본 발명은 노화방지제인 TMDQ을 함유한 타이어 고무의 노화방지 특성을 위해 노력하던 중 TMDQ의 성분에 따라 노화방지 특성을 살펴본바 TMDQ 성분 중 이량체 함량 및 폴리머 함량이 높은 TMDQ, 특히 이량체가 많이 함유된 TMDQ 사용시 고무의 노화방지 특성이 향상됨을 알게 되었다.The present invention, while trying to anti-aging properties of the tire rubber containing the TMDQ as an anti-aging agent to look at the anti-aging characteristics according to the components of the TMDQ bar containing a lot of TMDQ, especially dimers, high dimer content and polymer content It has been found that the anti-aging properties of rubbers are improved when using TMDQ.
따라서 본 발명은 타이어 고무조성물에 있어서 이량체 성분의 함량이 증가된 노화방지제인 TMDQ을 타이어용 고무조성물에 첨가하여 노화방지 특성이 향상된 타 이어용 고무조성물의 제공을 목적으로 한다.
Accordingly, an object of the present invention is to provide a tire rubber composition having improved anti-aging characteristics by adding TMDQ, an anti-aging agent having an increased dimer content in a tire rubber composition, to a rubber composition for tires.
본 발명은 상기의 목적을 달성하기 위해 타이어용 고무조성물에 있어서, 노화방지제로서 이량체(dimer) 성분이 55∼70% 함유된 2,2,4-트리메틸-1,2-디하이드로퀴놀린(TMDQ)을 원료고무 100중량부에 대하여 0.5∼3.5중량부 포함한다.The present invention provides a 2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ) containing 55 to 70% of a dimer component as an anti-aging agent in a rubber composition for a tire in order to achieve the above object. ) 0.5 to 3.5 parts by weight based on 100 parts by weight of the raw material rubber.
본 발명의 노화방지제인 TMDQ는 구성성분에 있어서 이량체 함량 및 폴리머 함량이 높은 TMDQ, 특히 이량체 함량이 55∼70% 함유된 것을 사용하는 것이 좋다. TMDQ의 구성성분에 있어서 이량체 함량이 55% 미만이면 노화방지제의 노화방지 효과가 미미하며, 70% 초과되면 노화방지제의 노화방지 효과에 있어서 별다른 차이가 없다. 따라서 본 발명에서 노화방지제인 TMDQ의 구성성분에 있어서 이량체 함량이 55∼70% 포함하는 것이 좋다. 한편, 노화방지제인 TMDQ은 이량체 이외에 모노머 10∼25%, 폴리머 20∼35%을 함유할 수 있다.TMDQ, the anti-aging agent of the present invention, it is preferable to use a TMDQ having a high dimer content and a polymer content, particularly those containing 55 to 70% of a dimer content. If the dimer content of the TMDQ is less than 55%, the anti-aging effect of the antioxidant is insignificant, and if it exceeds 70%, there is no difference in the anti-aging effect of the antioxidant. Therefore, it is preferable that the dimer content of the components of the TMDQ, which is an antioxidant in the present invention, contains 55 to 70%. On the other hand, TMDQ, an anti-aging agent, may contain 10 to 25% of monomers and 20 to 35% of polymers in addition to dimers.
본 발명의 타이어용 고무조성물에 있어서, 상기와 같이 이량체가 함유된 TMDQ을 원료고무 100중량부에 대하여 0.5중량부 미만 사용하면 노화방지 효과가 미미하며, 3.5중량부 초과하여 사용하면 뚜렷한 노화방지 효과의 상승효과가 없다. 따라서 본 발명에서 노화방지제인 TMDQ는 원료고무 100중량부에 대하여 0.5∼3.5중량부 포함하는 것이 좋다.In the rubber composition for tires of the present invention, when using less than 0.5 parts by weight of TMDQ containing a dimer as described above with respect to 100 parts by weight of the raw material rubber, the anti-aging effect is insignificant, and when used in excess of 3.5 parts by weight distinct anti-aging effect There is no synergistic effect. Therefore, in the present invention, TMDQ as an anti-aging agent may be included in an amount of 0.5 to 3.5 parts by weight based on 100 parts by weight of the raw material rubber.
본 발명에서 TMDQ는 입자크기를 0.1mm∼0.125mm으로 하여 종래 노화방지제의 입자크기에 비해 1/40∼1/50 감소시켜 고무 중에 분산성을 향상시켜 배합고무의 혼 합특성을 향상시킬 수 있다.In the present invention, the TMDQ has a particle size of 0.1 mm to 0.125 mm to reduce 1/40 to 1/50 compared to the particle size of a conventional anti-aging agent, thereby improving dispersibility in rubber, thereby improving the mixing properties of the rubber compound. .
본 발명에서 원료고무는 종래 타이어용 고무조성물의 원료고무로서 사용할 수 있는 것이라면 어떠한 것 이라도 사용할 수 있다. 이러한 원료고무의 일예로서 본 발명에서는 천연고무나 스티렌 부타디엔 고무, 부타디엔 고무, 이소프렌이 함유된 스티렌 부타디엔 고무, 니트릴을 포함하는 스티렌 부타디엔 고무, 네오프렌 고무와 같은 합성고무를 각각 단독으로 사용하거나 둘 이상의 합성고무가 동일한 비로 혼합된 혼합고무를 사용하거나, 천연고무와 합성고무가 1:9∼9:1의 비로 혼합된 혼합고무를 사용할 수 있다.The raw material rubber in the present invention can be used as long as it can be used as the raw material rubber of the rubber composition for a conventional tire. As an example of such raw rubber, in the present invention, synthetic rubber such as natural rubber, styrene butadiene rubber, butadiene rubber, styrene butadiene rubber containing isoprene, styrene butadiene rubber containing nitrile, and neoprene rubber may be used alone, or two or more synthetic rubbers may be used. It is possible to use mixed rubber in which rubber is mixed in the same ratio, or mixed rubber in which natural rubber and synthetic rubber are mixed in a ratio of 1: 9 to 9: 1.
본 발명은 상기에서 언급한 원료고무, 노화방지제 이외에 종래 타이어용 고무조성물에 사용되는 보강충진제, 활성제, 공정유, 가류제 및 가류촉진제와 같은 각종 첨가제를 필요에 따라 적의 선택하여 소정의 함량으로 사용할 수 있다. 그러나 이들은 종래 타이어용 고무조성물에 사용되는 일반적인 성분으로서 본원발명의 필수 구성성분이 아니므로 이하 자세한 내용은 생략하기로 한다.In the present invention, various additives such as reinforcing fillers, activators, process oils, vulcanizing agents, and vulcanization accelerators, which are used in rubber compositions for tires, in addition to the above-mentioned raw rubbers and anti-aging agents, can be appropriately selected as necessary. Can be. However, these are general components used in a rubber composition for a tire and are not essential components of the present invention.
한편 본 발명은 상기의 타이어용 고무조성물에 의해 제조한 고무가 함유된 타이어를 포함한다. 이때 타이어는 자동차용 타이어, 트럭용 타이어 및 버스용 타이어 중에서 선택된 어느 하나를 포함한다.On the other hand, the present invention includes a tire containing a rubber produced by the rubber composition for tires. In this case, the tire includes any one selected from a tire for a vehicle, a tire for a truck, and a tire for a bus.
이하 본 발명을 다음의 비교예, 실시예, 시험예에 의하여 설명하고자 한다. 그러나 이들은 본 발명의 일실시예로서 이들에 의해 본 발명의 권리범위가 한정되는 것은 아니다. Hereinafter, the present invention will be described by the following comparative examples, examples and test examples. However, these are not limited to the scope of the present invention by these as an embodiment of the present invention.
<비교예 1>Comparative Example 1
원료고무로서 스티렌 부타디엔 고무(SBR-1712) 100중량부, 카본블랙 78중량부, 아로마틱 오일 10중량부, 스테아린산 2중량부, 왁스 2중량부, 노화방지제(Kumanox-RD, 금호석유화학) 1중량부, 유황 1.9중량부, 가류촉진제(CZ) 2중량부를 밴버리 믹서에 넣고 160℃에서 30분 동안 가류하여 승용차용 트레드 고무를 제출하였다.As a raw material rubber, 100 parts by weight of styrene butadiene rubber (SBR-1712), 78 parts by weight of carbon black, 10 parts by weight of aromatic oil, 2 parts by weight of stearic acid, 2 parts by weight of wax, 1 part of antioxidant (Kumanox-RD, Kumho Petrochemical) Parts, 1.9 parts by weight of sulfur and 2 parts by weight of vulcanization accelerator (CZ) were placed in a Banbury mixer and vulcanized at 160 ° C. for 30 minutes to give a tread rubber for a passenger car.
상기에서 노화방지제는 모노머 함량이 26.37%, 이량체 함량이 48.57%, 폴리머 함량이 25.06%이고, 비중 1.07, 회분(ash) 0.04, 연화점(℃) 93.0, 열손실(heat loss) 0.20인 2,2,4-트리메틸-1,2-디하이드로퀴놀린(TMDQ)을 사용하였다.The anti-aging agent is 26.37% monomer content, 48.57% dimer content, 25.06% polymer content, specific gravity 1.07, ash 0.04, softening point (℃) 93.0, heat loss 0.22, 2, 2,4-trimethyl-1,2-dihydroquinoline (TMDQ) was used.
<비교예 2>Comparative Example 2
노화방지제인 TMDQ를 2중량부 사용하는 것을 제외하고는 상기 비교예 1과 동일한 조성 및 방법을 이용하여 승용차용 트레드 고무를 제조하였다. A tread rubber for a passenger car was manufactured using the same composition and method as in Comparative Example 1, except that 2 parts by weight of TMDQ, an antioxidant, was used.
<실시예 1><Example 1>
원료고무로서 스티렌 부타디엔 고무(SBR-1712) 100중량부, 카본블랙 78중량부, 아로마틱 오일 10중량부, 스테아린산 2중량부, 왁스 2중량부, 노화방지제(Kumanox-RD, 금호석유화학) 1중량부, 유황 1.9중량부, 가류촉진제(CZ) 2중량부를 밴버리 믹서에 넣고 160℃에서 30분 동안 가류하여 승용차용 트레드 고무를 제출하였다.As a raw material rubber, 100 parts by weight of styrene butadiene rubber (SBR-1712), 78 parts by weight of carbon black, 10 parts by weight of aromatic oil, 2 parts by weight of stearic acid, 2 parts by weight of wax, 1 part of antioxidant (Kumanox-RD, Kumho Petrochemical) Parts, 1.9 parts by weight of sulfur and 2 parts by weight of vulcanization accelerator (CZ) were placed in a Banbury mixer and vulcanized at 160 ° C. for 30 minutes to give a tread rubber for a passenger car.
상기에서 노화방지제는 모노머 함량이 11.25%, 이량체 함량이 62.65%, 폴리머 함량이 26.1%이고, 비중 1.05, 회분(ash) 0.18, 연화점(℃) 86.0, 열손실(heat loss) 0.11인 2,2,4-트리메틸-1,2-디하이드로퀴놀린(TMDQ)을 사용하였다.The anti-aging agent is 11.25% monomer content, 62.65% dimer content, polymer content 26.1%, specific gravity 1.05, ash 0.18, softening point (℃) 86.0, heat loss (0.11) 2, 2,4-trimethyl-1,2-dihydroquinoline (TMDQ) was used.
<실시예 2><Example 2>
노화방지제인 TMDQ를 2중량부 사용하는 것을 제외하고는 상기 실시예 1과 동일한 조성 및 방법을 이용하여 승용차용 트레드 고무를 제조하였다. A tread rubber for a passenger car was manufactured using the same composition and method as in Example 1, except that 2 parts by weight of an antioxidant TMDQ was used.
표 1. 비교예 및 실시예 고무조성물Table 1. Comparative Examples and Examples Rubber Compositions
*CZ : N-cyclohexyl-2-benzothiazolsulfen amide * CZ: N-cyclohexyl-2-benzothiazolsulfen amide
*노화방지제(A) : 모노머 함량이 26.37%, 이량체 함량이 48.57%, 폴리머 함량이 25.06%인 2,2,4-트리메틸-1,2-디하이드로퀴놀린(TMDQ)* Anti-aging agent (A): 2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ) having a monomer content of 26.37%, a dimer content of 48.57% and a polymer content of 25.06%
*노화방지제(B) : 모노머 함량이 11.25%, 이량체 함량이 62.65%, 폴리머 함량이 26.1%인 2,2,4-트리메틸-1,2-디하이드로퀴놀린(TMDQ)* Anti-aging agent (B): 2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ) having a monomer content of 11.25%, a dimer content of 62.65% and a polymer content of 26.1%.
<시험예><Test Example>
상기 실시예 및 비교예의 고무에 대해 ASTM 관련 규정에 의하여 RHEO, 무니점도, 인장물성, 마모와 같은 물성을 측정하고 그 결과를 아래의 표 2에 정리하여 나타내었다.Physical properties such as RHEO, Mooney Viscosity, Tensile Properties, and Abrasion were measured for the rubbers of Examples and Comparative Examples, and the results are summarized in Table 2 below.
표 2. 비교예 및 실시예 고무의 물성Table 2. Physical Properties of Comparative Examples and Examples
* 노화 : 120℃에서 24시간 동안 방치* Aging: left at 120 ℃ for 24 hours
상기 표 2의 비교에 1 및 실시예 1, 비교예 2 및 실시예 2에서와 같이 동량의 노화방지제를 적용하여 제조한 고무에 있어서, 본 발명에 의해 제조한 실시예 고무는 종래의 고무조성물인 비교예 고무에 비해 동등 수준 이상의 물성을 가짐을 알 수 있다. 특히 인장물성에 있어서, 본 발명의 고무조성물에 의해 제조한 고무는 종래 고무조성물에 의해 제조한 고무에 비해 초기 및 노화후의 인장물성 특성(100％모듈러스, 300％모듈러스)이 우수함을 알 수 있다. In the rubber prepared by applying the same amount of anti-aging agent as in Example 1, Example 1, Comparative Example 2 and Example 2 to the comparison of Table 2, the example rubber prepared by the present invention is a conventional rubber composition It can be seen that it has physical properties equal to or higher than the comparative rubber. In particular, in the tensile properties, it can be seen that the rubber produced by the rubber composition of the present invention has excellent tensile property characteristics (100% modulus, 300% modulus) after initial and aging, compared to the rubber prepared by the conventional rubber composition.
상술한 바와 같이, 본 발명의 바람직한 실시예를 참조하여 설명하였지만 해당 기술 분야의 숙련된 당업자라면 하기의 특허청구범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다.As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.
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