KR100622976B1 - Tread rubber composition for truck and bus radial tires on pavement with low polycyclic aromatics content - Google Patents
Tread rubber composition for truck and bus radial tires on pavement with low polycyclic aromatics content Download PDFInfo
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- KR100622976B1 KR100622976B1 KR1020020037631A KR20020037631A KR100622976B1 KR 100622976 B1 KR100622976 B1 KR 100622976B1 KR 1020020037631 A KR1020020037631 A KR 1020020037631A KR 20020037631 A KR20020037631 A KR 20020037631A KR 100622976 B1 KR100622976 B1 KR 100622976B1
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- truck
- oil
- tread rubber
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 31
- 239000005060 rubber Substances 0.000 title claims abstract description 31
- 239000000203 mixture Substances 0.000 title claims abstract description 15
- 125000003367 polycyclic group Chemical group 0.000 title claims description 5
- 239000010692 aromatic oil Substances 0.000 claims abstract description 12
- 239000010690 paraffinic oil Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000006229 carbon black Substances 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 11
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 claims description 8
- 235000014347 soups Nutrition 0.000 claims description 5
- 244000043261 Hevea brasiliensis Species 0.000 claims description 4
- 229920003052 natural elastomer Polymers 0.000 claims description 4
- 229920001194 natural rubber Polymers 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 239000008240 homogeneous mixture Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims 1
- 230000000704 physical effect Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 239000010734 process oil Substances 0.000 description 9
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 3
- 239000005662 Paraffin oil Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000000711 cancerogenic effect Effects 0.000 description 2
- 231100000357 carcinogen Toxicity 0.000 description 2
- 239000003183 carcinogenic agent Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 241001313207 Gonepteryx rhamni Species 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 208000000453 Skin Neoplasms Diseases 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 229940126214 compound 3 Drugs 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- ZMRUPTIKESYGQW-UHFFFAOYSA-N propranolol hydrochloride Chemical compound [H+].[Cl-].C1=CC=C2C(OCC(O)CNC(C)C)=CC=CC2=C1 ZMRUPTIKESYGQW-UHFFFAOYSA-N 0.000 description 1
- 201000000849 skin cancer Diseases 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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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
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- 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
- C08K5/01—Hydrocarbons
-
- 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
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
-
- 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
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
- B60C2200/065—Tyres specially adapted for particular applications for heavy duty vehicles for construction vehicles
Landscapes
- 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 버스 래디알 타이어의 트레드 고무 조성물에 관한 것이다.The present invention relates to tread rubber compositions of truck and bus radial tires.
본 발명에서는 기존의 타이어 제조시 사용되는 PCA 함량이 13 wt% 이상인 방향성 오일 대신에 PCA 함량이 3 wt% 미만인 파라핀계 오일(Paraffine oil)을 사용하여 친환경적이며 물성이 기존기술 대비 동등 이상으로 유지하도록 설계한 포장 도로용 트럭 및 버스 래디알 타이어의 트레드 고무조성물의 제공을 목적으로 한다.In the present invention, instead of the aromatic oil having a PCA content of 13 wt% or more used in the manufacture of conventional tires, paraffinic oil having a PCA content of less than 3 wt% is used for eco-friendly and physical properties to be maintained at equal or higher than conventional technologies. The purpose is to provide a tread rubber composition for the designed pavement truck and bus radial tires.
본 발명은 원료고무 100중량부에 대하여 카본블랙 45-55중량부, 폴리사이클릭 아로마틱스 함량이 3wt% 미만인 파라핀계 오일 1-3중량부를 포함함을 특징으로 한다.The present invention is characterized in that it comprises 45 to 55 parts by weight of carbon black and 1-3 parts by weight of paraffinic oil having a polycyclic aromatic content of less than 3 wt% based on 100 parts by weight of the raw material rubber.
Description
본 발명은 트럭 및 버스 래디알 타이어의 트레드 고무 조성물에 관한 것으로, 보다 상세하게는 폴리사이클릭 아로마틱스 함량이 적은 파라핀 오일을 사용한 포장도로용 트럭 및 버스 래디알 타이어의 트레드 고무 조성물에 관한 것이다.The present invention relates to tread rubber compositions of truck and bus radial tires, and more particularly to tread rubber compositions of pavement truck and bus radial tires using paraffin oils with low polycyclic aromatics content.
현대사회에 없어서는 안 될 필수품인 자동차의 증가는 인간 생활에 다양한 편리함을 가져왔다. 그러나 자동차가 증가할 수록 교통사고로 인한 인적물적 손실, 공해 및 환경문제, 석유에너지의 부족심화, 교통문제와 같은 많은 문제점이 대두되고 있으며 특히, 그 중에서도 생활에 밀접한 환경오염에 대한 문제는 꼭 해결해야 할 과제로 남아있다. 이러한 취지에서 자동차의 부품중 중요한 부분을 차지하는 타이어 원부재료에도 유해물질에 대한 규제가 강화되고 있는 실정이다. The increasing number of automobiles, an indispensable necessity in modern society, has brought a variety of conveniences to human life. However, as the number of automobiles increases, many problems such as human loss due to traffic accidents, pollution and environmental problems, deepening of petroleum energy, and transportation problems are emerging. Especially, the problem of environmental pollution that is closely related to life must be solved. It remains a challenge to do. To this end, regulations on harmful substances are being tightened on raw tire parts, which are an important part of automobile parts.
상기 타이어 원부재료 중 고무의 가공을 용이하게 하고, 체적 증량을 목적으로 공정유를 사용하고 있다. 일반적으로 타이어 업계에서는 상기 공정유으로 고무 와의 좋은 친화성 및 좋은 완제품 성능을 가지며 폴리사이클릭 아로마틱스(PCA: Polycyclic Aromatics) 함량이 높은 방향성 오일(Aromatic Oil)이 널리 사용되고 있다. 그러나 몇몇의 연구로부터 PCA 함량에 따라 오일을 쥐의 피부에 페인팅 시험을 실시한 결과 PCA 함량이 3wt% 이상일 경우에 피부암을 발생한다는 연구결과가 발표되었다. 그리고 유럽연합에서는 발암물질에 대해서는 기술적으로 대체물질이 있을 때에는 발암물질의 사용을 줄이거나 대체할 것을 권고하고 있다. 그리고 1994년 스웨덴에서 발표한 KEMI(the Swedish National Chemicals Inspectorate) 보고서에서는 타이어 조성물에 PCA 함량이 높은 오일 사용함에 있어서 관심을 고조시켰다.The process oil is used for the purpose of making it easy to process rubber | gum of a tire raw material, and a volume increase. Generally, in the tire industry, aromatic oils having a good affinity with rubber and good finished product performance and having high polycyclic aromatics (PCA) content are widely used as the process oil. However, several studies have reported that oil tests on rat skin according to PCA content result in skin cancer when the PCA content is above 3wt%. The European Union recommends that carcinogens be reduced or replaced when there is a technical alternative. And the Swedish National Chemicals Inspectorate (KEMI) report published in Sweden in 1994 raised interest in the use of oils with high PCA content in tire compositions.
이에 유럽연합 위험물질 집행부에서는 IP 346 DMSO 추출법에 의해 3wt% PCA 함량을 지닌 오일에 발암성 물질로 규정하고, 해당 오일 및 그 오일을 사용한 제품에도 발암물질 라벨 및 문구를 부착하여 판매하도록 규정하고 있다. 따라서 타이어 산업에 대해서도 공정유에 포함되어 있는 PCA 함량이 3wt% 미만이면서 성능은 우수한 타이어 개발이 요구되고 있다.In response, the European Union's Dangerous Substances Commission mandates that oils with a 3 wt% PCA content are carcinogenic by IP 346 DMSO Extraction, and that the oil and its products are also labeled with a carcinogen label and text. . Therefore, the tire industry is also required to develop a tire with excellent performance while the PCA content in the process oil is less than 3wt%.
이에, 본 발명에서는 기존의 타이어 제조시 사용되는 PCA 함량이 13 wt% 이상인 방향성 오일 대신에 PCA 함량이 3 wt% 미만인 파라핀계 오일(Paraffine oil)을 사용하여 친환경적이며 물성이 기존기술 대비 동등 이상으로 유지하도록 설계한 포장 도로용 트럭 및 버스 래디알 타이어의 트레드 고무조성물의 제공을 목적으로 한다.
Therefore, in the present invention, instead of the aromatic oil having a PCA content of 13 wt% or more, the conventional tires use paraffinic oil having a PCA content of less than 3 wt%, which is eco-friendly and its physical properties are equivalent to those of the conventional technology. It is intended to provide a tread rubber composition of truck and bus radial tires for pavements designed to maintain.
본 발명은 원료고무 100중량부에 대하여 카본블랙 45-55중량부, 폴리사이클릭 아로마틱스 함량이 3wt% 미만인 파라핀계 오일 1-3중량부를 포함함을 특징으로 한다.The present invention is characterized in that it comprises 45 to 55 parts by weight of carbon black and 1-3 parts by weight of paraffinic oil having a polycyclic aromatic content of less than 3 wt% based on 100 parts by weight of the raw material rubber.
본 발명에서 원료고무는 천연고무, 합성고무를 각각 단독으로 사용하거나 또는 천연고무와 합성고무가 혼합된 혼합고무로서 특별히 한정되지는 아니한다.In the present invention, the raw material rubber is not particularly limited as a natural rubber, a synthetic rubber used alone or a mixed rubber mixed with natural rubber and synthetic rubber.
한편 본 발명에서 원료고무 100중량부에 대해서 파라핀계 오일 1 중량부 미만 사용하면 공정유가 부족하여 고무조성물의 가류공정시 공정성이 하락하는 문제가 있고, 3 중량부 초과 사용하면 뚜렷한 공정성의 상승이 없이 과사용된 공정유가 도리어 최종고무 제품의 물성을 감소시킬 위험이 있어 본원발명의 트레드 고무조성물에 있어서 원료고무 100중량부에 대해 파라핀계 오일은 1-3 중량부 포함하는 것이 좋다.Meanwhile, when less than 1 part by weight of paraffinic oil is used with respect to 100 parts by weight of the raw material rubber, there is a problem that the process oil is insufficient and the fairness is decreased during the vulcanization process of the rubber composition. There is a risk that the overused process oil may reduce the physical properties of the final rubber product, so in the tread rubber composition of the present invention, it is preferable to include 1-3 parts by weight of paraffinic oil with respect to 100 parts by weight of the raw rubber.
다음 표 1은 공정유 중 방향성 오일과 파라핀 오일의 특성을 비교 한 것이다.Table 1 compares the characteristics of aromatic oils and paraffin oils in process oils.
표 1. 방향성 오일과 파라핀 오일의 특성 비교Table 1. Comparison of properties of aromatic oils and paraffin oils
상기 PCA(wt%)은 오일 내의 PCA 함량을 나타낸다.The PCA (wt%) represents the PCA content in the oil.
상기 Ca/Cp/Cn은 각각 아로마틱(Aromatic)계 오일, 파라핀(Paraffine)계 오일, 나프텐(Naphthene)계 오일 함량을 나타낸다.The Ca / Cp / Cn represents an aromatic oil, a paraffinic oil, and a naphthene oil, respectively.
상기 아닐린점(℃)은 극성을 나타내는 수치로써, 대표적인 극성물질인 아닐린과의 혼용성을 측정하여 고무와의 가공성, 친화성의 관리기준이 된다.The aniline point (° C.) is a numerical value representing polarity, and is measured for compatibility with aniline, which is a typical polar material, and becomes a management standard for workability and affinity with rubber.
이하 비교예, 실시예 및 시험예를 통하여 본 발명을 보다 상세히 설명한다. 그러나 본 발명은 이들에 국한되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Comparative Examples, Examples and Test Examples. However, the present invention is not limited to these.
(비교예)(Comparative Example)
다음 표 2에 지시된 배합비와 같이, 본 발명은 천연고무 100중량부에 대하여 카본블랙 50중량부, 공정유인 방향성 오일 2중량부, 스테아린산 2중량부, 아연화 5중량부, 노화방지제 4.5중량부, 지방산과 아연 소프(Zn soups) 및 칼륨 소프(K soups) 혼합물의 균질배합제 3중량부, 유황 2중량부, 가황촉진제 0.65중량부, 지연제 0.2중량부를 포함하여 이루어지며 이를 혼합한 후 밴버리믹서를 이용하여 고무시편을 제조하였다.As the compounding ratio indicated in the following Table 2, the present invention is 50 parts by weight of carbon black, 2 parts by weight of aromatic oil which is a process oil, 2 parts by weight of stearic acid, 5 parts by weight of zinc, 5 parts by weight of antioxidant, It contains 3 parts by weight of a homogeneous mixture of fatty acid and Zn soups and K soups, 2 parts by weight of sulfur, 0.65 parts by weight of vulcanization accelerator, and 0.2 parts by weight of retardant. Rubber specimens were prepared by using the method.
(실시예)(Example)
공정유인 방향성 오일 2중량부 대신에 파라핀 오일 2중량부를 사용하는 것을 제외하고는 상기 비교예와 같은 조성물, 조성비 및 방법을 이용하여 고무시편을 제조하였다.A rubber specimen was prepared using the same composition, composition ratio, and method as in Comparative Example, except that 2 parts by weight of paraffin oil was used instead of 2 parts by weight of aromatic oil as a process oil.
표 2. 실시예 및 비교예의 트럭 버스용 트레드 고무조성물(단위 : 중량부) Table 2. Tread rubber compositions for truck buses of Examples and Comparative Examples (unit: parts by weight)
<시험예><Test Example>
비교예와 실시예의 고무시편을 ASTM 관련규정에 의하여 물성을 측정하였으며 그 결과는 다음 표 3에 나타난 바와 같다.The rubber specimens of Comparative Examples and Examples were measured for physical properties according to ASTM-related regulations, and the results are shown in Table 3 below.
표3. 비교예 및 실시예의 물성측정 결과Table 3. Physical property measurement results of Comparative Examples and Examples
상기 표3에 나타난 바와 같이 물성측정결과는 다음과 같다.As shown in Table 3, the physical property measurement results are as follows.
첫째, 상기 발열성능은 상승온도가 낮을수록 우수한 물성을 나타내는데, 본 발명에 따른 실시예의 고무시편은 비교예의 고무시편 보다 상기 특성이 향상됨을 알 수 있다.First, the exothermic performance shows excellent physical properties as the temperature rises, the rubber specimen of the embodiment according to the present invention can be seen that the properties are improved than the rubber specimen of the comparative example.
둘째, 상기 블로우 아웃은 파단시간이 길수록 우수한 물성을 나타내는데, 본 발명에 따른 실시예의 고무시편은 비교예의 고무시편 보다 상기 특성이 향상됨을 알 수 있다.Second, the blowout shows excellent physical properties as the break time is longer, and it can be seen that the rubber specimen of the embodiment according to the present invention has improved properties than the rubber specimen of the comparative example.
이상의 비교예, 실시예 및 시험예에서 보는 바와 같이, 트럭 및 버스 래디알 타이어의 트레드 고무조성물에 있어서, PCA 함량이 13 wt% 이상인 방향성 오일 대신에 PCA 함량이 3 wt% 미만인 파라핀계 오일(Paraffine oil)을 사용함으로써 기존의 기술 대비 동등 수준으로 유지하면서도 내열성능(발열성능, 블로우 아웃)이 향 상되어 성능이 우수하면서도 환경 친화적인 타이어를 제조할 수 있게 되었다.As shown in Comparative Examples, Examples, and Test Examples, in the tread rubber composition of truck and bus radial tires, paraffinic oil having a PCA content of less than 3 wt% instead of aromatic oil having a PCA content of 13 wt% or more (Paraffine) By using oil, the heat resistance (heating performance and blow out) is improved while maintaining the same level as the existing technology, and it is possible to manufacture tires having excellent performance and being environmentally friendly.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020020037631A KR100622976B1 (en) | 2002-06-29 | 2002-06-29 | Tread rubber composition for truck and bus radial tires on pavement with low polycyclic aromatics content |
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| KR1020020037631A KR100622976B1 (en) | 2002-06-29 | 2002-06-29 | Tread rubber composition for truck and bus radial tires on pavement with low polycyclic aromatics content |
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| KR100622976B1 true KR100622976B1 (en) | 2006-09-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4801641A (en) * | 1986-06-17 | 1989-01-31 | Bridgestone Corporation | Rubber compositions and pneumatic tires using the same |
| JPH01135844A (en) * | 1987-11-21 | 1989-05-29 | Japan Synthetic Rubber Co Ltd | Rubber composition for tire |
| JPH0776635A (en) * | 1993-09-08 | 1995-03-20 | Asahi Chem Ind Co Ltd | Selectively partially hydrogenated polymer composition |
| KR980009356A (en) * | 1996-07-09 | 1998-04-30 | 홍건희 | Rubber compositions for hump strips of tires |
| KR20010011809A (en) * | 1999-07-30 | 2001-02-15 | 신형인 | Tire Rubber Composition Decreasing Poly Cyclic Aromatic Hydrocarbon Content |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4801641A (en) * | 1986-06-17 | 1989-01-31 | Bridgestone Corporation | Rubber compositions and pneumatic tires using the same |
| JPH01135844A (en) * | 1987-11-21 | 1989-05-29 | Japan Synthetic Rubber Co Ltd | Rubber composition for tire |
| JPH0776635A (en) * | 1993-09-08 | 1995-03-20 | Asahi Chem Ind Co Ltd | Selectively partially hydrogenated polymer composition |
| KR980009356A (en) * | 1996-07-09 | 1998-04-30 | 홍건희 | Rubber compositions for hump strips of tires |
| KR20010011809A (en) * | 1999-07-30 | 2001-02-15 | 신형인 | Tire Rubber Composition Decreasing Poly Cyclic Aromatic Hydrocarbon Content |
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