KR100332688B1 - Tread Rubber Composition for Air Pressure Tire of Truck and Bus - Google Patents
Tread Rubber Composition for Air Pressure Tire of Truck and Bus Download PDFInfo
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- KR100332688B1 KR100332688B1 KR1019990035931A KR19990035931A KR100332688B1 KR 100332688 B1 KR100332688 B1 KR 100332688B1 KR 1019990035931 A KR1019990035931 A KR 1019990035931A KR 19990035931 A KR19990035931 A KR 19990035931A KR 100332688 B1 KR100332688 B1 KR 100332688B1
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- rubber
- rubber composition
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 22
- 239000000203 mixture Substances 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 229920003049 isoprene rubber Polymers 0.000 claims abstract description 12
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 11
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 11
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000008117 stearic acid Substances 0.000 claims abstract description 11
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 6
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 6
- 229920001194 natural rubber Polymers 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 238000004073 vulcanization Methods 0.000 abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 5
- 239000006229 carbon black Substances 0.000 abstract description 5
- 239000011593 sulfur Substances 0.000 abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000004014 plasticizer Substances 0.000 abstract description 4
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- -1 amine compound Chemical class 0.000 abstract description 2
- 230000003712 anti-aging effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 239000012763 reinforcing filler Substances 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- GUUVPOWQJOLRAS-UHFFFAOYSA-N Diphenyl disulfide Chemical compound C=1C=CC=CC=1SSC1=CC=CC=C1 GUUVPOWQJOLRAS-UHFFFAOYSA-N 0.000 abstract 2
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 abstract 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract 1
- 239000011701 zinc Substances 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
- 230000000704 physical effect Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 239000010692 aromatic oil Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000010734 process oil Substances 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 239000005662 Paraffin oil Substances 0.000 description 1
- 239000004614 Process Aid Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- DEQZTKGFXNUBJL-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)cyclohexanamine Chemical compound C1CCCCC1NSC1=NC2=CC=CC=C2S1 DEQZTKGFXNUBJL-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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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
- C08L7/00—Compositions of natural rubber
-
- 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
- B60C1/0016—Compositions of the tread
-
- 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
- C08K5/3415—Five-membered rings
- C08K5/3417—Five-membered rings condensed with carbocyclic rings
-
- 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
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/37—Thiols
- C08K5/372—Sulfides, e.g. R-(S)x-R'
- C08K5/3725—Sulfides, e.g. R-(S)x-R' containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L11/00—Compositions of homopolymers or copolymers of chloroprene
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
본 발명은 트럭 및 버스의 공기압 타이어용 트레드 고무조성물에 관한 것으로 보다 상세하게는 종래의 타이어 고무조성물의 결함을 개선하기 위한 방안으로 오일 대신에 공정 가소제로서 2,2'-디벤즈아미드디펜일디설파이드(2,2'-Dibenzamide diphenyldisulfide)와 철-폴피라진(Fe-Porphyrazine)이 1/1 비율의 혼합물로 구성되며 융점이 50-60℃인 GE-1525가 0.2-0.7 중량부, 분자량이 2,000-10,000인 액상 이소프렌 고무(Liquid Isoprene Rubber)가 3-6 중량부 및 스테아린산을 3-7 중량부 를 사용하고, 고무 조성물은 천연고무로서 고무 100 중량부에 대하여 카본블랙 혹은 카본블랙/실리카 등을 사용한 보강 충진제 30-80 중량부, 가류활성제로서 아연화(ZnO) 3-7 중량부, 가류제로서 황 및/또는 유황 공여형 가류제와 가류촉진제로서 설펜아티드계 및 노화방지제로서 아민계 화합물 등을 사용하였다.The present invention relates to a tread rubber composition for pneumatic tires of trucks and buses, and more particularly to 2,2'-dibenzamidedifenyl disulfide as a process plasticizer instead of oil in order to improve defects of conventional tire rubber compositions. (2,2'-Dibenzamide diphenyldisulfide) and Fe-Porphyrazine are mixtures of 1/1 ratio, 0.2-15 parts by weight of GE-1525 with melting point of 50-60 ° C and 2,000- molecular weight The liquid isoprene rubber of 10,000 uses 3-6 parts by weight and 3-7 parts by weight of stearic acid, and the rubber composition is made of natural rubber using carbon black or carbon black / silica, etc., based on 100 parts by weight of rubber. 30-80 parts by weight of reinforcing filler, 3-7 parts by weight of zinc (ZnO) as vulcanizing agent, sulfur and / or sulfur donating vulcanizing agent as vulcanizing agent, sulfenate type as vulcanization accelerator, amine compound as anti-aging agent, etc. use It was.
상기에서 GE-1525/액상 이소프랜고무의 비율은 0.1-0.3이고 액상 이소프렌고무/스테아린산의 비율은 0.8-1.2의 범위로 사용시 점도의 현저한 저하를 가져오면서 가류후 무성중 내마모 및 고무 표면의 찢겨짐 현상을 현저히 개선할 수 있다.In the above, the ratio of GE-1525 / liquid isoprene rubber is 0.1-0.3, and the ratio of liquid isoprene rubber / stearic acid is 0.8-1.2. The load phenomenon can be significantly improved.
Description
본 발명은 트레드 고무조성물에 관한 것으로 천연고무를 사용한 트럭 & 버스용 타이어 트레드(Tread)의 내마모 및 내마멸 특성을 향상시키는 것과 동시에 환경 유해 물질로 대두되고 있는 공정조제중에 하나인 아로마틱 오일(Aromatic oil)을 고무 배합물에서 완전히 삭제한 트레드 고무조성물에 관한 것이다.The present invention relates to a tread rubber composition, which improves the wear and abrasion resistance of tire treads for trucks and buses using natural rubber, and is one of the process aids that are emerging as environmentally harmful substances. A tread rubber composition wherein oil is completely eliminated from the rubber compound.
타이어의 배합과정중 기기의 부하량을 최소화하고 공정을 원활하게 하기 위하여 첨가되는 파라핀 오일이나 아로마틱 오일 등과 같은 배합물은 환경 유해물질로 규정하여 사용을 제한하려는 움직임이 유럽 및 전세계적으로 확산되고 있는 추세이다. 또한 이들은 고무에 배합하면 타이어의 성능 측면에서 볼 때 가류 후 고무 화합물의 경도하락 및 특히 내 마모 특성의 하락을 초래한다. 최근에는 공정유에 벤젠류 및 유해물질이 최소화된 오일을 적용하는 방법이 연구되고 있으나, 원가 상승 및 고무화합물의 물성 중 유리전이온도(glass transition temperature)의 현저한 변화로 인한 내 마모 특성의 현저한 하락을 초래하기 때문에 대량 생산의 적용에 한계점을 내포하고 있다Formulations such as paraffin oil and aromatic oil, which are added to minimize the equipment load and make the process smooth during the tire compounding process, are defined as environmentally hazardous substances, and there is a trend to restrict the use of them. . In addition, when incorporated into rubber, they result in a decrease in hardness of the rubber compound after vulcanization and in particular a decrease in wear resistance in view of tire performance. Recently, a method of applying benzenes and oils with minimal harmful substances to the process oil has been studied. However, due to the cost increase and the remarkable change of the glass transition temperature among the physical properties of the rubber compound, the wear resistance has decreased considerably. This imposes a limitation on the application of mass production.
본 발명은 공정유에 벤젠류 및 유해물질이 최소화된 오일을 적용하는 방법 대신에 공정 가소제로서 융점이 50-60℃인 2,2'-디벤즈아미드디펜일디설파이드와 철-폴피라진이 1/1 비율의 혼합물로 구성된 GE-1525(Rhenchemi사 제품)에 분자량 2,000-10,000의 액상 이소프렌 고무 그리고 천연고무의 물성 개질을 위한 스테아린산을 사용하여 트럭 및 버스의 공기압 타이어용 트레드 고무조성물을 제공하는 것을 목적으로 한다.In the present invention, instead of applying benzenes and oils with minimal harmful substances to process oils, 2,2'-dibenzamidedifenyldisulfide and iron-polpyrazine having a melting point of 50-60 ° C. are used as process plasticizers. To provide a tread rubber composition for pneumatic tires for trucks and buses, using GE-1525 (Rhenchemi), a mixture of proportions, using liquid isoprene rubber with a molecular weight of 2,000-10,000 and stearic acid for the modification of the properties of natural rubber. do.
본 발명은 상기와 같은 종래의 타이어 고무 조성물의 결함을 개선하기 위한 방안으로 오일을 사용하지 않는 대신 공정 가소제로서 2,2'-디벤즈아미드디펜일디설파이드(2,2'-Dibenzamidediphenyldisulfide)와 철-폴피라진(Fe-Porphyrazine)이 1/1 비율의 혼합물로 구성된 융점이 50-60℃인 GE-1525(Rhenchemi사 제품) 0.2-0.7 중량부, 분자량이 2,000-10,000인 액상 이소프렌 고무(Liquid Isoprene Rubber, 이하 LIR이라 한다.) 3-6 중량부 그리고 천연고무의 물성 개질을 위한 스테아린산을 최소 3 중량부 이상과 최대 7 중량부 사용한 것을 특징으로 하고 있다. 본 발명의 고무 조성물은 천연고무로서 고무 100 중량부에 대하여 카본블랙 혹은 카본블랙 /실리카 등을 사용한 보강 충진제 30-80 중량부, 그 밖에 가류활성제로서 아연화(ZnO) 3-7 중량부, 가류제로서 황 및/또는 유황 공여형 가류제와 가류촉진제로서 설펜아미드계를 사용하는 것을 특징으로 하고 있다. 이 밖에 기타 노화방지제로서 아민계 화합물 등을 사용할 수 있다.The present invention is to improve the defects of the conventional tire rubber composition as described above, instead of using oil, 2,2'-dibenzamidediphenyldisulfide and iron- as a process plasticizer. 0.2-0.7 parts by weight of GE-1525 (manufactured by Rhenchemi) with a melting point of 50-60 ° C. consisting of a mixture of 1/1 (Fe-Porphyrazine), liquid isoprene rubber with a molecular weight of 2,000-10,000 3-6 parts by weight and at least 3 parts by weight and up to 7 parts by weight of stearic acid for modifying the properties of natural rubber. The rubber composition of the present invention is 30-80 parts by weight of reinforcing filler using carbon black or carbon black / silica, etc., based on 100 parts by weight of rubber as natural rubber, 3-7 parts by weight of zinc oxide (ZnO) as vulcanizing agent, and vulcanizing agent. Sulfur and / or sulfur donor vulcanizing agents and sulfenamides as vulcanization accelerators. In addition, an amine compound or the like can be used as another anti-aging agent.
본 발명에 있어서의 카본블랙의 특성은 요오드(I2) 흡착가 40-100mg/g, DPB 흡유가 40-120cm3/100g인 것을 30-80 중량부 사용하는 것이 좋다.Properties of the carbon black in the present invention is iodine (I 2) adsorption value 40-100mg / g, DPB oil absorption 40-120cm 3 it is preferable to use 30 to 80 parts by weight in that the / 100g.
본 발명은 일반적으로 사용되는 아로마틱 오일 대신에 실시예 2와 3에서와 같이 GE-1525 0.3-0.7 중량부, 액상 이소프렌 고무 5-6 중량부, 스테아린산 3-7 중량부를 동시에 사용시 점도의 현저한 감소와 함께 물성중 인장강도, 내마모 및 내 찢김 등에서 아주 우수한 결과를 보여주고 있는 반면, 실시예 4와 5에서와 같이 아로마틱 오일 대신 단독으로 0.7 중량부 이상의 GE-1525 사용시 공정 측면에서 해결은 어느 정도 가능하나 물성에 악영향을 주며, 액상 이소프렌 고무를 단독 사용시 공정 및 물성 개선 측면에서는 뚜렷한 장점이 나타나지 않는다. 이와 같은 현상은 각 물질을 단독으로 사용하는 것 보다는 각 약품의 적절한 비율로 혼용함으로써 공정 및 환경적인 측면 뿐만 아니라 물성측면까지 동시에 개선 할 수 있다는 것을 알 수 있다.The present invention provides a significant reduction in viscosity when using 0.3-15 parts by weight of GE-1525, 5-6 parts by weight of liquid isoprene rubber, and 3-7 parts by weight of stearic acid, as in Examples 2 and 3 instead of the commonly used aromatic oils. In addition, while showing excellent results in tensile strength, abrasion resistance and tearing in physical properties, while in the case of using GE-1525 by more than 0.7 parts by weight instead of aromatic oil as in Examples 4 and 5, the solution can be solved to some extent. However, it adversely affects the physical properties, there is no obvious advantage in terms of process and physical properties improvement when using the liquid isoprene rubber alone. This phenomenon can be seen that not only by using each substance alone but also by mixing the appropriate ratio of each drug can improve the process and environmental aspects as well as the physical aspects at the same time.
다음의 표 1은 본 발명의 고무조성물을 실시예 1 내지 실시예 5로 하여 대조군과 비교한 물성시험 결과를 나타낸 것이다.Table 1 below shows the physical property test results of the rubber composition of the present invention as compared with the control group in Examples 1 to 5.
표 1. 본 발명의 고무조성물 및 물성Table 1. Rubber Compositions and Physical Properties of the Invention
* 기타 첨가제로는 아연화(ZnO) 3 중량부, 유리황(free sulfur) 2.0 중량부, 촉진제로서 N-시클로헥실-2-벤조티아졸설펜아미트(N-Cyclohexyl-2-Benzothiazole Sul fenamide) 1.2 중량부, 노방제(RD/K-13/RD=1/2.5/1)와 가류지연제를 첨가하였다.* Other additives include 3 parts by weight of zinc oxide (ZnO), 2.0 parts by weight of free sulfur, and 1.2 parts by weight of N-cyclohexyl-2-benzothiazole sulfenamide as an accelerator. In addition, a furnace agent (RD / K-13 / RD = 1 / 2.5 / 1) and a vulcanization delay agent were added.
** 대조군 시편을 100으로 하여 내마모 시험하여 시험전후의 무게를 이용한 상대지수를 계산한 결과를 보면 상대적으로 높은 값일수록 좋은 결과(PICO ABRASION TESTER, Cut & chip tester:B.F. Goodrich사 내마모 시험기)를 나타내고 있다.** When the relative test value is calculated using the weight test before and after the test with 100 control specimens, the higher the value, the better the result (PICO ABRASION TESTER, Cut & chip tester: BF Goodrich wear tester) Indicates.
다시 부연하면 GE-1255 0.3-0.7 중량부, LIR-50 고무를 3-6 중량부 그리고 스테아린산을 최소한 3 중량부 이상 7 중량부 이하로서 특히 GE-1525/액상 이소프렌 고무의 비율은 0.1-0.3이고 액상 이소프렌고무/스테아린산의 비율은 0.8-1.2의 범위로 사용시 점도의 현저한 저하를 가져오면서 가류후 무성중 내마모 및 고무 표면의 찢겨짐 현상을 현저히 개선할 수 있음을 보여주고 있다. 액상화제나 공정 가소제의 단독 사용시 오히려 물성에서는 나쁜 결과를 주거나 뚜렷한 장점을 보여 주지 않고 있다.Again, 0.3-1. 7 parts by weight of GE-1255, 3-6 parts by weight of LIR-50 rubber and at least 3 parts by weight and 7 parts by weight of stearic acid, in particular the ratio of GE-1525 / liquid isoprene rubber is 0.1-0.3 The ratio of liquid isoprene rubber / stearic acid in the range of 0.8-1.2 shows that it can significantly improve the abrasion resistance and tearing of the rubber surface during vulcanization after vulcanization, with a significant decrease in viscosity. Rather than using liquid or process plasticizers alone, the physical properties do not give bad results or show distinct advantages.
< 적용예 ><Application example>
타이어 트레드로서 표 1의 조성비에 따라 제조된 트레드 고무를 사용하여 통상의 방법에 따라 사내 시험실 시험을 기초로 하여 타이어 규격이 11R22.5의 트럭 버스용 타이어를 제조하여 고속버스 전륜용에 취부하여 내마모 성능을 평가하였으며 그 결과를 표 2에 나타냈다. 표 1의 시험결과와 같이 표 2에서도 공정유인 아로마틱 오일 대신 LIR-50, GE-1525와 3 중량부 이상의 스테아린산을 사용한 타이어가 마모성능이 우수함을 알 수 있다.As a tire tread, a truck bus tire having a tire specification of 11R22.5 was manufactured and mounted on a high-speed bus front wheel based on an in-house laboratory test using a tread rubber manufactured according to the composition ratio of Table 1 according to a conventional method. The wear performance was evaluated and the results are shown in Table 2. As shown in the test results in Table 1, in Table 2, tires using LIR-50, GE-1525 and 3 parts by weight or more of stearic acid instead of aromatic oils, which are process oils, show excellent wear performance.
표 2. 완제품 타이어 시험결과Table 2. Finished Tire Test Results
본 발명의 조성물 중에서 GE-1525/액상 이소프랜고무의 비율은 0.1-0.3이고 액상 이소프렌고무/스테아린산의 비율은 0.8-1.2의 범위로 사용시 점도의 현저한 저하를 가져오면서 가류후 물성중 내마모 및 고무 표면의 찢겨짐 현상을 현저히 개선할 수 있다.In the composition of the present invention, the ratio of GE-1525 / liquid isoprene rubber is 0.1-0.3 and the ratio of liquid isoprene rubber / stearic acid is 0.8-1.2. The tearing of the surface can be significantly improved.
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| KR1019990035931A KR100332688B1 (en) | 1999-08-27 | 1999-08-27 | Tread Rubber Composition for Air Pressure Tire of Truck and Bus |
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| KR20030028639A (en) * | 2001-09-20 | 2003-04-10 | 금호산업 주식회사 | Tread compound for truck and bus tire |
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| KR20030028639A (en) * | 2001-09-20 | 2003-04-10 | 금호산업 주식회사 | Tread compound for truck and bus tire |
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