JP2004352995A - Eco tire - Google Patents
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- JP2004352995A JP2004352995A JP2004198181A JP2004198181A JP2004352995A JP 2004352995 A JP2004352995 A JP 2004352995A JP 2004198181 A JP2004198181 A JP 2004198181A JP 2004198181 A JP2004198181 A JP 2004198181A JP 2004352995 A JP2004352995 A JP 2004352995A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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Abstract
Description
本発明は、石油外資源からなる原材料を用いたエコタイヤに関する。 The present invention relates to an eco-tire using raw materials made of resources other than petroleum.
現在市販されているタイヤは、全重量の半分以上が石油資源からなる原材料から構成されている。たとえば、一般的な乗用車用ラジアルタイヤは、タイヤ全重量に対して、合成ゴム約２割、カーボンブラック約２割、他にアロマオイルや合成繊維を含んでおり、タイヤ全体で５割以上の石油資源からなる原材料を含んでいる。 Tires on the market today are made up of raw materials that make up over half of their total weight from petroleum resources. For example, a general radial tire for a passenger car contains about 20% of synthetic rubber, about 20% of carbon black, and aroma oil and synthetic fiber in addition to the total weight of the tire. Includes raw materials consisting of resources.
しかしながら、近年、環境問題が重視されるようになり、ＣＯ2排出抑制の規制が強化され、また、石油原料は有限であって供給量が年々減少していることから将来的に石油価格の高騰が予測され、石油資源からなる原材料の使用には限界がみられる。 However, in recent years, environmental issues have become more important, regulations on controlling CO 2 emissions have been tightened, and petroleum raw materials have been finite and supply has been decreasing year by year. The use of petroleum-based raw materials is limited.
そこで、本発明は、現在タイヤに用いられている石油資源からなる原材料の一部または全てを石油外資源からなる原材料で代替することによって、地球に優しいタイヤ（エコタイヤ）を提供することを目的とする。 Therefore, an object of the present invention is to provide an earth-friendly tire (eco-tire) by substituting a part or all of the raw materials made of petroleum resources currently used for tires with raw materials made of non-petroleum resources. I do.
すなわち、本発明は、全重量の７５重量％以上が石油外資源からなる原材料から構成されてなるタイヤに関する。 That is, the present invention relates to a tire in which 75% by weight or more of the total weight is composed of raw materials composed of resources other than petroleum.
前記石油外資源からなる原材料としては、天然ゴム、無機フィラーおよび／またはバイオフィラー、植物油脂、天然繊維などを用いることができる。 As the raw material composed of non-petroleum resources, natural rubber, inorganic fillers and / or biofillers, vegetable oils and fats, and natural fibers can be used.
本発明によれば、合成ゴムに代えて天然ゴム、カーボンブラックに代えて無機フィラーおよび／またはバイオフィラー、石油系オイルに代えて植物油脂、合成繊維に代えて天然繊維を用いるなどして、タイヤ全重量の７５重量％以上を石油外資源からなる原材料で構成することによって、地球に優しく将来の石油の供給量の減少に備えた新規なタイヤを得ることができる。 According to the present invention, a natural rubber is used in place of a synthetic rubber, an inorganic filler and / or a biofiller is used in place of carbon black, a vegetable oil or fat is used in place of a petroleum oil, and a natural fiber is used in place of a synthetic fiber. By constituting 75% by weight or more of the total weight with raw materials composed of resources other than petroleum, it is possible to obtain a new tire which is kind to the earth and is prepared for a future decrease in oil supply.
現在市販されているタイヤは、全重量の半分以上が、石油資源からなる原材料から構成されている。たとえば、ゴム成分として用いられているスチレン−ブタジエンゴム（ＳＢＲ）、ブタジエンゴム（ＢＲ）、ブチルゴム（ＩＩＲ）などの合成ゴムは、原油のナフサ分解によって得たＣ4留分からモノマーを抽出し、重合して製造されている。充填剤として用いられているカーボンブラックは、燃料油を燃焼させた雰囲気下で原油を噴霧し、熱分解して製造されている。プロセスオイルとして用いられているアロマオイル、ナフテンオイル、パラフィンオイルなどの石油系オイルは、原油の常圧蒸留によって得られる重油成分である。ケースコードなどに用いられている合成繊維であるポリエステルは、原油から精製して得たエチレンとパラキシレンを原料とし、エチレンからエチレングリコールを、また、パラキシレンからテレフタル酸ジメチルまたはテレフタル酸を得、エチレングリコールとテレフタル酸ジメチルまたはテレフタル酸とを重縮合して製造される。その他にも、ワックス、老化防止剤、レジン、接着剤、加硫促進剤などに石油資源からなる原材料を用いている。 Currently, more than half of the total weight of tires on the market is made up of petroleum-based raw materials. For example, styrene is used as a rubber component - butadiene rubber (SBR), synthetic rubbers such as butadiene rubber (BR), butyl rubber (IIR) extracts the monomer from C 4 fraction obtained by naphtha cracking of crude oil, polymerized It is manufactured. Carbon black used as a filler is produced by spraying crude oil in an atmosphere in which fuel oil is burned and thermally decomposing. Petroleum oils such as aroma oils, naphthenic oils, and paraffin oils used as process oils are heavy oil components obtained by atmospheric distillation of crude oil. Polyester, which is a synthetic fiber used for case cords and the like, uses ethylene and para-xylene obtained from crude oil as raw materials, obtains ethylene glycol from ethylene, and dimethyl terephthalate or terephthalic acid from para-xylene, It is produced by polycondensing ethylene glycol with dimethyl terephthalate or terephthalic acid. In addition, raw materials composed of petroleum resources are used for waxes, antiaging agents, resins, adhesives, vulcanization accelerators, and the like.
本発明では、これらの合成ゴム、カーボンブラック、石油系オイル、合成繊維などの石油資源からなる原材料を石油外資源からなる原材料で代替することによって、タイヤ全体の７５重量％以上、好ましくは８５重量％以上、より好ましくは９５重量％以上が石油外資源からなる原材料からなるエコタイヤを実現する。石油外資源からなる原材料が７５重量％未満では、石油資源の使用を抑制する効果が小さい。石油資源からなる原材料のなかでも、合成ゴム、カーボンブラックはタイヤの主たる構成成分であり、これらを石油外資源からなる原材料で代替することが好ましい。タイヤ部材別には、石油資源からなる原材料はトレッドに最も多く含まれ、トレッドを構成する石油資源からなる原材料は、タイヤ全重量の約２３％を占める。ついで、サイドウォール、ケーストッピング、インナーライナー、ブレーカートッピング、ビード部の順に石油資源からなる原材料を多く含み、これらのタイヤ部材において石油資源からなる原材料を石油外資源からなる原材料で代替することが好ましい。ここで、石油外資源とは、たとえば植物由来の資源、鉱物、石炭、天然ガス、貝殻、卵殻、骨粉、甲殻類の殻などがあげられる。 In the present invention, the raw material composed of petroleum resources such as synthetic rubber, carbon black, petroleum-based oil, and synthetic fiber is replaced with a raw material composed of non-petroleum resources, so that 75% by weight or more, preferably 85% by weight of the entire tire. % Or more, more preferably 95% by weight or more, is realized as an eco-tire made of raw materials composed of resources other than petroleum. If the amount of the raw material composed of non-petroleum resources is less than 75% by weight, the effect of suppressing the use of petroleum resources is small. Among the raw materials composed of petroleum resources, synthetic rubber and carbon black are the main constituent components of tires, and it is preferable to substitute these with raw materials composed of non-petroleum resources. For each tire component, the tread contains the largest amount of raw materials composed of petroleum resources, and the raw materials composed of petroleum resources constituting the tread account for about 23% of the total weight of the tire. Then, it is preferable to include a lot of raw materials composed of petroleum resources in the order of the sidewall, case topping, inner liner, breaker topping, and bead portion, and to replace the raw materials composed of petroleum resources with the raw materials composed of non-petroleum resources in these tire members. . Here, non-petroleum resources include, for example, plant-derived resources, minerals, coal, natural gas, shells, eggshells, bone meal, shells of crustaceans, and the like.
合成ゴムを代替する石油外資源からなる原材料としては、天然ゴムがあげられる。また、天然ゴムを修飾した改質天然ゴムを用いることもできる。合成ゴムの７５重量％以上、さらには８５重量％以上を天然ゴムで代替することが好ましい。天然ゴムが７５重量％未満では石油資源の使用を抑制する効果が小さく、さらに転がり抵抗が増大する傾向がある。 As a raw material composed of non-petroleum resources to substitute for synthetic rubber, natural rubber can be mentioned. Further, modified natural rubber obtained by modifying natural rubber can also be used. It is preferable that 75% by weight or more, more preferably 85% by weight or more of the synthetic rubber be replaced with natural rubber. If the natural rubber content is less than 75% by weight, the effect of suppressing the use of petroleum resources is small, and the rolling resistance tends to increase.
カーボンブラックを代替する石油外資源からなる原材料としては、シリカ、セリサイト、炭酸カルシウム、クレー、アルミナ、タルク、炭酸マグネシウム、水酸化アルミニウム、水酸化マグネシウム、酸化マグネシウム、酸化チタンなどの無機フィラー；でんぷん、セルロースなどの植物多糖や、キチン、キトサンなどの動物多糖などのバイオフィラーなどがあげられる。なかでも、ゴムの補強性を確保するためには、シリカが好ましい。 Raw materials consisting of non-petroleum resources that substitute for carbon black include inorganic fillers such as silica, sericite, calcium carbonate, clay, alumina, talc, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, magnesium oxide, and titanium oxide; starch. And biofillers such as plant polysaccharides such as cellulose and animal polysaccharides such as chitin and chitosan. Among them, silica is preferable in order to secure the reinforcing property of rubber.
シリカを用いる場合、シリカのＢＥＴ比表面積は１５０〜２５０ｍ2／ｇであることが好ましい。シリカの比表面積が１５０ｍ2／ｇ未満では補強性が劣る傾向があり、２５０ｍ2／ｇをこえると分散性に劣り、凝集してしまうため、物性が低下する傾向がある。 When silica is used, the silica preferably has a BET specific surface area of 150 to 250 m 2 / g. If the specific surface area of the silica is less than 150 m 2 / g, the reinforcing property tends to be poor, and if it exceeds 250 m 2 / g, the dispersibility is poor and the property tends to be reduced due to aggregation.
カーボンブラックの７５重量％以上、さらには８５重量％以上を無機フィラーおよび／またはバイオフィラーで代替することが好ましい。無機フィラーとバイオフィラーの合計量が７５重量％未満では石油資源の使用を抑制する効果が小さく、さらに転がり抵抗が増大する傾向がある。 It is preferable to replace 75% by weight or more, and more preferably 85% by weight or more, of carbon black with an inorganic filler and / or a biofiller. When the total amount of the inorganic filler and the biofiller is less than 75% by weight, the effect of suppressing the use of petroleum resources is small, and the rolling resistance tends to increase.
カーボンブラックを無機フィラーで代替する場合には、シランカップリング剤を併用することが好ましい。シランカップリング剤としては、従来からタイヤの分野において用いられているものであればとくに制限はないが、たとえば、ビス（３−トリエトキシシリルプロピル）テトラスルフィド、ビス（３−トリメトキシシリルプロピル）テトラスルフィド、ビス（２−トリエトキシシリルプロピル）テトラスルフィド、３−メルカプトプロピルトリエトキシシラン、２−メルカプトエチルトリメトキシシランなどがあげられ、これらをそれぞれ単独で、または任意に組み合わせて用いることができる。なかでも、シランカップリング剤の補強性効果と加工性という点から、ビス（３−トリエトキシシリルプロピル）テトラスルフィド、３−メルカプトプロピルトリエトキシシランを用いることが好ましく、さらに、加工性という点から、ビス（３−トリエトキシシリルプロピル）テトラスルフィドを用いることがとくに好ましい。 When replacing carbon black with an inorganic filler, it is preferable to use a silane coupling agent in combination. The silane coupling agent is not particularly limited as long as it has been conventionally used in the field of tires. For example, bis (3-triethoxysilylpropyl) tetrasulfide, bis (3-trimethoxysilylpropyl) Tetrasulfide, bis (2-triethoxysilylpropyl) tetrasulfide, 3-mercaptopropyltriethoxysilane, 2-mercaptoethyltrimethoxysilane and the like can be mentioned, and these can be used alone or in any combination. . Among these, bis (3-triethoxysilylpropyl) tetrasulfide and 3-mercaptopropyltriethoxysilane are preferably used from the viewpoint of the reinforcing effect and processability of the silane coupling agent, and further, from the viewpoint of processability. It is particularly preferable to use bis (3-triethoxysilylpropyl) tetrasulfide.
無機フィラーにシランカップリング剤を併用する場合は、無機フィラーに対してシランカップリング剤を３〜２０重量％用いることが好ましい。シランカップリング剤の添加量が３重量％未満では添加効果が充分に得られず、２０重量％をこえるとコストが上がる割に得られる効果の向上が小さくなる。 When a silane coupling agent is used in combination with the inorganic filler, it is preferable to use 3 to 20% by weight of the silane coupling agent with respect to the inorganic filler. If the addition amount of the silane coupling agent is less than 3% by weight, the effect of addition cannot be sufficiently obtained, and if it exceeds 20% by weight, the improvement in the effect obtained will be small although the cost increases.
石油系オイルを代替する石油外資源からなる原材料としては、ひまし油、綿実油、あまに油、なたね油、大豆油、パーム油、やし油、落花生湯、ロジン、パインオイル、パインタール、トール油、コーン油、こめ油、べに花油、ごま油、オリーブ油、ひまわり油、パーム核油、椿油、ホホバ油、マカデミアナッツ油、サフラワー油、桐油などの植物油脂があげられる。なかでも、供給量、価格および軟化効果の点で、なたね油、パーム油、やし油が好ましい。 Raw materials consisting of non-petroleum resources that replace petroleum oils include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil, rosin, pine oil, pine tar, tall oil, and corn Vegetable oils such as oil, rice oil, potato oil, sesame oil, olive oil, sunflower oil, palm kernel oil, camellia oil, jojoba oil, macadamia nut oil, safflower oil and tung oil. Above all, rapeseed oil, palm oil, and coconut oil are preferable in terms of supply amount, price, and softening effect.
これらのなかでも、不飽和度の小さい植物油脂が好ましく、ヨウ素価（油脂１００ｇに付加させることのできるヨウ素のグラム数）が１００〜１３０の半乾性油、ヨウ素価が１００以下の不乾性油、固形脂などが好ましい。ヨウ素価が１３０をこえると、ｔａｎδが上昇し、硬さが低下して、転がり抵抗が増大し、操縦安定性が低下する傾向がある。 Among these, vegetable oils having a low degree of unsaturation are preferable, and semi-dry oils having an iodine value (gram number of iodine that can be added to 100 g of oil and fat) of 100 to 130, non-drying oils having an iodine value of 100 or less, Solid fats and the like are preferred. When the iodine value exceeds 130, tan δ tends to increase, the hardness decreases, the rolling resistance increases, and the steering stability tends to decrease.
石油系オイルの７５重量％以上、さらには８５重量％以上を植物油脂で代替することが好ましい。植物油脂が７５重量％未満では石油資源の使用を抑制する効果が小さく、さらに転がり抵抗が増大する傾向がある。 It is preferable to replace 75% by weight or more, more preferably 85% by weight or more of petroleum-based oil with vegetable fats and oils. If the vegetable oil is less than 75% by weight, the effect of suppressing the use of petroleum resources is small, and the rolling resistance tends to increase.
また、植物油脂は、加硫後のゴム硬さが、４０〜９０となる量、配合されることが好ましい。ゴム硬度が４０未満では必要な剛性が得られない傾向があり、９０をこえると加工性に劣る傾向がある。 Moreover, it is preferable that the vegetable oils and fats are blended in such an amount that the rubber hardness after vulcanization is 40 to 90. If the rubber hardness is less than 40, required rigidity tends not to be obtained, and if it exceeds 90, workability tends to be poor.
合成繊維を代替する石油外資源からなる原材料としては、木材パルプから製造されるレーヨン、アセテート、綿実粗リンターから製造されるキャプラなどがあげられる。なかでも、タイヤに必要とされる高強力を有する点でレーヨンが好ましく用いられる。 Raw materials consisting of non-petroleum resources that substitute for synthetic fibers include rayon, acetate produced from wood pulp, and capra produced from cottonseed coarse linters. Among them, rayon is preferably used because it has a high strength required for a tire.
本発明のタイヤは、従来使用されていた石油資源からなる原材料の一部または全てを前記石油外資源からなる原材料で代替し、従来のタイヤと同様の方法で製造することができる。 The tire of the present invention can be manufactured by a method similar to that of a conventional tire, in which a part or all of the conventionally used raw material composed of petroleum resources is replaced with the raw material composed of non-petroleum resources.
以下に、本発明を実施例に基づいて詳細に説明するが、本発明はこれらのみに限定されるものではない。 Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.
以下に、実施例および比較例で用いた薬品をまとめてしめす。 Hereinafter, the chemicals used in Examples and Comparative Examples are summarized.
（石油資源からなる原材料）
ＳＢＲ：住友化学工業（株）製のＳＢＲ１５０２
ＢＲ：宇部興産（株）製のＢＲ１５０Ｂ
ＩＩＲ：エクソンモービル化学（株）製のＣｌ−ＩＩＲ１０６８
カーボンブラック（ＩＳＡＦ）：三菱化学（株）製のダイヤブラックＩ
カーボンブラック（ＦＥＦ）：三菱化学（株）製のダイヤブラックＥ
カーボンブラック（ＧＰＦ）：三菱化学（株）製のダイヤブラックＧ
カーボンブラック（ＨＡＦ）：三菱化学（株）製のダイヤブラックＨＡ
カーボンブラック（ＬＭ−ＨＡＦ）：三菱化学（株）製のダイヤブラックＬＨ
アロマオイル：（株）ジャパンエナジー製のプロセスＸ−１４０
ミネラルオイル：出光興産（株）製のダイアナプロセスＰＡ３２
ワックス：日本精蝋（株）製のオゾエース０３５５
老化防止剤：住友化学工業（株）製のアンチゲン６Ｃ
硬化レジン：住友デュレス（株）製のスミライトレジンＰＲ１２６８６
接着剤（ＣＯＳＴ）：（株）ジャパンエナジー製のＣＯＳＴ−Ｆ
接着剤（Ｓ．６２０）：住友化学工業（株）製のスミカノール６２０
加硫促進剤：大内新興化学工業（株）製のノクセラーＮＳ
(Raw materials composed of petroleum resources)
SBR: SBR1502 manufactured by Sumitomo Chemical Co., Ltd.
BR: BR150B manufactured by Ube Industries, Ltd.
IIR: Cl-IIR1068 manufactured by ExxonMobil Chemical Co., Ltd.
Carbon black (ISAF): Diamond Black I manufactured by Mitsubishi Chemical Corporation
Carbon black (FEF): Diamond Black E manufactured by Mitsubishi Chemical Corporation
Carbon black (GPF): Diamond Black G manufactured by Mitsubishi Chemical Corporation
Carbon black (HAF): Diamond black HA manufactured by Mitsubishi Chemical Corporation
Carbon black (LM-HAF): Diamond Black LH manufactured by Mitsubishi Chemical Corporation
Aroma oil: Process X-140 manufactured by Japan Energy Co., Ltd.
Mineral oil: Diana Process PA32 manufactured by Idemitsu Kosan Co., Ltd.
Wax: Ozoace 0355 manufactured by Nippon Seiro Co., Ltd.
Anti-aging agent: Antigen 6C manufactured by Sumitomo Chemical Co., Ltd.
Cured resin: Sumitomo Durres Sumilite Resin PR12686
Adhesive (COST): COST-F manufactured by Japan Energy Co., Ltd.
Adhesive (S.620): Sumikanol 620 manufactured by Sumitomo Chemical Co., Ltd.
Vulcanization accelerator: Noxeller NS manufactured by Ouchi Shinko Chemical Industry Co., Ltd.
（石油外資源からなる原材料）
天然ゴム：ＲＳＳ＃３
シリカ：デグッサ・ヒュルス（株）製のウルトラジルＶＮ３
カップリング剤：デグッサ・ヒュルス（株）製のＳｉ−６９
セリサイト：日本フォラム（株）製のＫＭ−Ｓ
炭酸カルシウム：白石工業（株）製の白艶華ＣＣ
植物油：日清製油（株）製の精製パーム油Ｊ（Ｓ）
ステアリン酸：日本油脂（株）製のステアリン酸椿
酸化亜鉛：三井金属鉱業（株）製の酸化亜鉛２種
硫黄：鶴見化学（株）製の粉末硫黄
(Raw materials composed of non-oil resources)
Natural rubber: RSS # 3
Silica: Ultragil VN3 manufactured by Degussa Huls Co., Ltd.
Coupling agent: Si-69 manufactured by Degussa Huls Co., Ltd.
Sericite: KM-S manufactured by Japan Forum Co., Ltd.
Calcium carbonate: Shiraishi Kagaku CC manufactured by Shiraishi Industry Co., Ltd.
Vegetable oil: Refined palm oil J (S) manufactured by Nisshin Oil Co., Ltd.
Stearic acid: Zinc Oxide stearic acid manufactured by NOF Corporation: Two kinds of zinc oxide manufactured by Mitsui Kinzoku Mining Co., Ltd .: Sulfur powder manufactured by Tsurumi Chemical Co., Ltd.
実施例１
表１に示す配合内容を混練りし、トレッドＡ（タイヤ重量の４０％）、サイドウォールＡ（タイヤ重量の１７％）、インナーライナーＡ（タイヤ重量の８％）、クリンチエイペックスＡ（タイヤ重量の３％）、ビードエイペックスＡ（タイヤ重量の５％）、ブレーカートッピングＡ（タイヤ重量の８％）およびカーカスプライトッピングＡ（タイヤ重量の３％）を形成した。なお、ブレーカーにはスチールコード（タイヤ重量の８％）を適用し、カーカスプライには、１８４０ｄｔｅｘ／２のレーヨンからなるコード（タイヤ重量の５％）を適用した。
Example 1
The compounding contents shown in Table 1 were kneaded, and tread A (40% of tire weight), sidewall A (17% of tire weight), inner liner A (8% of tire weight), clinch apex A (tire weight) 3%), bead apex A (5% of tire weight), breaker tapping A (8% of tire weight), and car cusp sprite tapping A (3% of tire weight). Note that a steel cord (8% of the tire weight) was applied to the breaker, and a cord (5% of the tire weight) made of 1840 dtex / 2 rayon was applied to the carcass ply.
前記の各部材およびその他の部材（タイヤ重量の３％）をタイヤ成型機上に通常の方法で貼り付けて未加硫タイヤを形成し、加硫機中で加熱加圧して、石油外資源からなる原材料９７重量％のエコタイヤ（タイヤサイズ：１９５／６５Ｒ１５ ９１Ｓ）を得た。 The above-mentioned members and other members (3% of the tire weight) are pasted on a tire molding machine in a usual manner to form an unvulcanized tire, and heated and pressed in a vulcanizer to obtain a non-petroleum resource. An eco-tire (tire size: 195 / 65R15 91S) with a raw material of 97% by weight was obtained.
比較例１
表１に示す配合内容を混練りし、トレッドＢ、サイドウォールＢ、インナーライナーＢ、クリンチエイペックスＢ、ビードエイペックスＢ、ブレーカーＢおよびカーカスプライＢを形成し、これらを用いて実施例１と同様の方法により、石油外資源からなる原材料４４重量％の従来タイヤを得た。ただし、カーカスプライには、１６７０ｄｔｅｘ／２のポリエステルからなるコードを適用した。
Comparative Example 1
The composition shown in Table 1 was kneaded to form a tread B, a side wall B, an inner liner B, a clinch apex B, a bead apex B, a breaker B, and a carcass ply B. By the same method, a conventional tire of 44% by weight of raw material composed of resources other than petroleum was obtained. However, a cord made of 1670 dtex / 2 polyester was applied to the carcass ply.
実施例および比較例で製造したタイヤについて以下の耐久性評価および性能量化を行なった。 The tires manufactured in Examples and Comparative Examples were subjected to the following durability evaluation and performance quantification.
（１）高速耐久性
ＪＩＳ Ｄ４２３０「自動車用タイヤ」の高速性能試験ＡのＳレンジの規格に基づき評価を行なった。
(1) High-speed durability Evaluation was performed based on the S range standard of the high-speed performance test A of JIS D4230 “Automobile tire”.
（２）転がり抵抗係数（ＲＲＣ）
速度８０ｋｍ／時間、空気圧２５０ｋＰａ、付加荷重４．０ｋＮの条件で転がり抵抗を測定した。転がり抵抗を付加荷重で割ったものを１０4倍して、転がり抵抗係数とした。転がり抵抗係数が小さいほど、発熱性が小さく良好である。
(2) Rolling resistance coefficient (RRC)
The rolling resistance was measured under the conditions of a speed of 80 km / hour, an air pressure of 250 kPa, and an additional load of 4.0 kN. The value obtained by dividing the rolling resistance by the additional load was multiplied by 10 4 to obtain a rolling resistance coefficient. The smaller the rolling resistance coefficient, the smaller the exothermic property and the better.
（３）制動テスト
時速１００ｋｍからのドライアスファルト路面およびウェットアスファルト路面での制動停止距離から、摩擦係数μを求めた。比較例１のμを１００として指数表示した。指数が大きいほど性能は良好である。
(3) Braking test A friction coefficient μ was determined from a braking stop distance on a dry asphalt road surface and a wet asphalt road surface at a speed of 100 km / h. The index was expressed as an index with μ of Comparative Example 1 being 100. The higher the index, the better the performance.
（４）実車官能評価
排気量２０００ｃｃの乗用車を用いて、テストコース内のドライアスファルト路面およびウェットアスファルト路面で、グリップ、剛性感および乗心地について官能評価を行ない、比較例１を６点として評点づけした。評点が高いほど性能は良好である。評点が０．５点の差とは、訓練されたテストドライバーがやっと感知し得る差である。
(4) Sensory evaluation of actual vehicle Using a passenger car with a displacement of 2000 cc, sensory evaluation was performed on grip, rigidity, and riding comfort on dry asphalt road surfaces and wet asphalt road surfaces in a test course, and Comparative Example 1 was rated as 6 points. did. The higher the rating, the better the performance. A difference of 0.5 points is a difference that a trained test driver can barely perceive.
結果を表２に示す。表２から、実施例１のエコタイヤは、比較例１の従来タイヤに比べて転がり抵抗が非常に小さく低燃費性に優れ、高速耐久性やその他の性能においても、比較例１の従来タイヤと同等であることがわかる。 Table 2 shows the results. From Table 2, it can be seen that the eco-tire of Example 1 has very low rolling resistance and excellent fuel economy compared to the conventional tire of Comparative Example 1, and is equivalent to the conventional tire of Comparative Example 1 in high-speed durability and other performances. It can be seen that it is.
Claims (5)
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