JPH08188672A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH08188672A JPH08188672A JP7001398A JP139895A JPH08188672A JP H08188672 A JPH08188672 A JP H08188672A JP 7001398 A JP7001398 A JP 7001398A JP 139895 A JP139895 A JP 139895A JP H08188672 A JPH08188672 A JP H08188672A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- rubber
- content
- carbon black
- pneumatic tire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は空気入りタイヤに関し、
更に詳しくは特にスタッドレスタイヤなどの空気入りタ
イヤのキャップトレッド部を、導電性カーボンブラック
を配合して熱伝導率を高くした特定のゴム組成物で構成
して、氷上性能に優れかつ耐摩耗性にも優れた自動車用
空気入りタイヤに関する。FIELD OF THE INVENTION The present invention relates to a pneumatic tire,
More specifically, in particular, the cap tread portion of a pneumatic tire such as a studless tire is made of a specific rubber composition having a high thermal conductivity obtained by blending conductive carbon black, which has excellent on-ice performance and abrasion resistance. Also relates to an excellent pneumatic tire for automobiles.
【０００２】[0002]
【従来の技術】空気入りタイヤのトレッド部は一般に外
層側のキャップトレッドと内層側のアンダートレッド部
とから構成されている。かかる空気入りタイヤは各種性
能が要求されているが、特に寒冷地用空気入りタイヤと
して氷上性能と耐摩耗性とを高次バランスさせることが
望まれている。かかる観点から多くの提案がなされてい
るが、未だ十分な改良がされておらず、本発明はかかる
問題をゴム組成物の熱伝導率を一定以上にすることによ
って解決したものである。従来技術において、タイヤ用
ゴム組成物としてゴム組成物の熱伝導率を高くする試み
はあるが、氷上性能又は氷上性能と耐摩耗性の高次バラ
ンスを得ることの提案は全く認められない。例えば特開
昭５７−５３３４０号公報には加硫されたトレッドゴム
を未加硫のクッションゴムを介してタイヤのケーシング
と接着するコールドリトレッドにおいて、クッションゴ
ム又はそれに隣接するゴムに例えば導電性カーボンを配
合することが記載されている。例えば特開昭６１−１４
３２０３号公報には例えばリムクッションゴムに導電性
カーボンを配合して車体で発生する静電気がリム・タイ
ヤを通して路面に伝わりやすくした空気入りタイヤが記
載されている。更に特開平２−２０２９３６号公報には
ラジアルプライタイヤの少なくとも表面層に導電性カー
ボンブラックを含ませて保存中及び走行中に汚染される
ことのないラジアルタイヤが記載されている。更に特開
平２−２３４８０２号公報には粒径０．０１〜５mmの硬
質物を配合した（アルミナを配合すれば結果として熱伝
導率はやや高くなる）ゴム組成物を用いて、硬質物の引
っ掻き効果によって氷上性能を高めることが記載されて
いるが、このものは耐摩耗性に劣るという問題がある。The tread portion of a pneumatic tire is generally composed of an outer layer side cap tread and an inner layer side undertread portion. Such a pneumatic tire is required to have various performances, and it is particularly desired that the pneumatic tire for a cold region has a high-order balance of the performance on ice and the wear resistance. Although many proposals have been made from this point of view, they have not been sufficiently improved, and the present invention solves this problem by making the thermal conductivity of the rubber composition above a certain level. In the prior art, there have been attempts to increase the thermal conductivity of rubber compositions as rubber compositions for tires, but no proposal has been made to obtain performance on ice or a high-order balance of performance on ice and abrasion resistance. For example, in Japanese Unexamined Patent Publication No. 57-53340, in cold red tread in which a vulcanized tread rubber is bonded to a casing of a tire through an unvulcanized cushion rubber, for example, conductive carbon is added to the cushion rubber or a rubber adjacent to the cushion rubber. Blending is described. For example, JP-A-61-14
For example, Japanese Patent Laid-Open No. 3203 describes a pneumatic tire in which conductive carbon is mixed with rim cushion rubber so that static electricity generated in a vehicle body can be easily transmitted to a road surface through a rim tire. Further, JP-A-2-202936 describes a radial tire in which at least the surface layer of a radial ply tire contains conductive carbon black and is not contaminated during storage or running. Further, in JP-A-2-234802, a rubber composition in which a hard material having a particle size of 0.01 to 5 mm is blended (the addition of alumina results in slightly higher thermal conductivity) is used to scratch the hard material. It is described that the effect improves the performance on ice, but this has a problem of poor wear resistance.
【０００３】[0003]
【発明が解決しようとする課題】従って、本発明は、前
述した従来技術の現状に鑑み、氷上性能及び耐摩耗性を
両立させた空気入りタイヤを提供することを目的とす
る。SUMMARY OF THE INVENTION Therefore, in view of the above-mentioned state of the art, it is an object of the present invention to provide a pneumatic tire having both on-ice performance and abrasion resistance.
【０００４】[0004]
【課題を解決するための手段】本発明に従えば、（ｉ）
ジエン系ゴム１００重量部、（ii）揮発分０．５重量％
以下、炭素分９８重量％以上、水素分０．２重量％以下
の導電性カーボンブラック３〜５０重量部並びに（iii)
揮発分０．５重量％超、水素分０．２重量％超、窒素比
表面積（Ｎ2 ＳＡ）７０m2／ｇ以上及び２４Ｍ４ＤＢＰ
吸油量８０ml／１００ｇ以上のカーボンブラック１０〜
６５重量部を含む熱伝導率が０．２４kcal／ｍ・hr・℃
以上のゴム組成物からキャップトレッド部を構成したこ
とを特徴とする空気入りタイヤが提供される。According to the present invention, (i)
100 parts by weight of diene rubber, (ii) volatile content of 0.5% by weight
Hereinafter, 3 to 50 parts by weight of conductive carbon black having a carbon content of 98% by weight or more and a hydrogen content of 0.2% by weight or less, and (iii)
Volatile content> 0.5% by weight, hydrogen content> 0.2% by weight, nitrogen specific surface area (N 2 SA) 70 m 2 / g or more and 24M4DBP
Carbon black with oil absorption of 80ml / 100g or more 10
Thermal conductivity including 65 parts by weight is 0.24 kcal / m ・ hr ・ ℃
A pneumatic tire having a cap tread portion made of the above rubber composition is provided.
【０００５】[0005]
【作用】以下、本発明の構成及び作用効果について詳し
く説明する。本発明に係る空気入りタイヤはその構造に
は特に限定はなく、従来から知られている任意の構造の
空気入りタイヤは勿論のこと、更には現在開発中の各種
構造の空気入りタイヤ構造とすることができる。本発明
の空気入りタイヤはそのキャップトレッド部を前記組成
のゴム組成物から構成することが必須の要件である。The function and effect of the present invention will be described in detail below. The structure of the pneumatic tire according to the present invention is not particularly limited, and not only a conventionally known pneumatic tire of any structure but also a pneumatic tire structure of various structures currently under development can be used. be able to. In the pneumatic tire of the present invention, it is an essential requirement that the cap tread portion be composed of the rubber composition having the above composition.
【０００６】本発明に係る空気入りタイヤのキャップト
レッド部を構成するゴム組成物に第１の成分として配合
されるジエン系ゴムは、従来からタイヤトレッド用ゴム
として一般的に使用されてきた任意のゴムとすることが
でき、そのようなゴムとしては、例えば天然ゴム（Ｎ
Ｒ）、ポリブタジエンゴム（ＢＲ）、各種スチレン−ブ
タジエン共重合体ゴム（ＳＢＲ）、ポリイソプレンゴム
（ＩＲ）などを挙げることができ、これらは単独又は任
意の比率のブレンドとして使用することができる。本発
明に用いるジエン系ゴムとしては、低温特性及び耐摩耗
性の観点から、ガラス転移温度（Ｔｇ）が−４５℃以下
のジエン系ゴムが好ましく、−５０℃以下のジエン系ゴ
ムが更に好ましい。また硬度Ｈｓ（０℃）は７０以下で
あるのが好ましい。The diene rubber compounded as the first component in the rubber composition forming the cap tread portion of the pneumatic tire according to the present invention has been conventionally used as a rubber for tire treads. The rubber may be rubber, and examples of such rubber include natural rubber (N
R), polybutadiene rubber (BR), various styrene-butadiene copolymer rubbers (SBR), polyisoprene rubber (IR), etc., and these can be used alone or as a blend in an arbitrary ratio. The diene rubber used in the present invention is preferably a diene rubber having a glass transition temperature (Tg) of −45 ° C. or lower, and more preferably −50 ° C. or lower, from the viewpoint of low temperature characteristics and abrasion resistance. The hardness Hs (0 ° C.) is preferably 70 or less.
【０００７】本発明の空気入りタイヤのキャップトレッ
ド部を構成するゴム組成物に第２の必須成分として配合
される導電性カーボンは揮発分０．５重量％以下、好ま
しくは０．４重量％以下、炭素分９８重量％以上、好ま
しくは９９重量％以上、水素分０．２重量％以下、好ま
しくは０．１重量％以下の導電性カーボンブラック（例
えばアセチレンブラック、ケッチェンブラックなど）で
ある。また、結晶子の大きさは平均で３０オングストロ
ーム以上であるのが好ましく、更に好ましくは３５オン
グストローム以上である。The conductive carbon compounded as the second essential component in the rubber composition constituting the cap tread portion of the pneumatic tire of the present invention has a volatile content of 0.5% by weight or less, preferably 0.4% by weight or less. A conductive carbon black having a carbon content of 98% by weight or more, preferably 99% by weight or more, and a hydrogen content of 0.2% by weight or less, preferably 0.1% by weight or less (eg, acetylene black, Ketjen black, etc.). The average crystallite size is preferably 30 angstroms or more, and more preferably 35 angstroms or more.
【０００８】前記導電性カーボンはジエン系ゴム１００
重量部当り、３〜５０重量部（即ち３〜５０phr ）、好
ましくは５〜４０重量部配合する。この配合量が多くな
り過ぎると氷上性能は更に改良されるが耐摩耗性が劣る
ようになるので好ましくない。The conductive carbon is a diene rubber 100.
3 to 50 parts by weight (i.e., 3 to 50 phr), preferably 5 to 40 parts by weight per part by weight. If the blending amount is too large, the performance on ice is further improved, but the wear resistance becomes poor, which is not preferable.
【０００９】本発明の空気入りタイヤのキャップトレッ
ド部を構成するゴム組成物に第３の必須成分として配合
されるカーボンブラックは揮発分０．５重量％超、水素
分０．２重量％超、Ｎ2 ＳＡ（窒素比表面積）が７０m2
／ｇ以上、好ましくは１００m2／ｇ以上、更に好ましく
は１２０〜２００m2／ｇ、２４Ｍ４ＤＢＰ（ジブチルフ
タレート）吸油量が８０ml／１００ｇ以上、好ましくは
９０ml／１００ｇ以上、更に好ましくは９０〜１５０ml
／１００ｇで、ゴム組成物中に１０〜６５phr、好まし
くは２０〜６０phr 配合する。カーボンブラックは前記
物性を満足しない場合には耐摩耗性並びにドライ及びウ
ェット操縦安定性に劣るようになって好ましくない。カ
ーボンブラックの配合量が少な過ぎると耐摩耗性及びド
ライ、ウェット性能が十分でなくなるおそれがあり、逆
に多過ぎるとゴムのＨｓが上昇して氷上性能が低下する
し、このＨｓを調整するために軟化剤を増量すると耐摩
耗性が低下するおそれがあるので好ましくない。Carbon black added as a third essential component to the rubber composition constituting the cap tread portion of the pneumatic tire of the present invention has a volatile content of more than 0.5% by weight and a hydrogen content of more than 0.2% by weight. N 2 SA (specific nitrogen surface area) is 70 m 2
/ G or more, preferably 100 m 2 / g or more, more preferably 120 to 200 m 2 / g, 24M4DBP (dibutyl phthalate) oil absorption of 80 ml / 100 g or more, preferably 90 ml / 100 g or more, more preferably 90 to 150 ml.
10/65 phr, preferably 20-60 phr, in the rubber composition. If the above-mentioned physical properties are not satisfied, carbon black is inferior in abrasion resistance and dry and wet steering stability, which is not preferable. If the blending amount of carbon black is too small, abrasion resistance and dry and wet performance may not be sufficient. Conversely, if it is too large, Hs of rubber rises and ice performance deteriorates. If the amount of the softening agent is increased, the abrasion resistance may decrease, which is not preferable.
【００１０】本発明の空気入りタイヤのキャップトレッ
ド部を構成するゴム組成物は前記第１、第２及び第３の
成分を必須の構成要素とし、ゴム組成物は熱伝導率が
０．２４kcal／ｍ・hr・℃以上、好ましくは０．２４〜
０．６で、硬度Ｈｓ（０℃）が好ましくは７０以下で、
４５〜６５であるのが更に好ましい。ゴム組成物の熱伝
導率が０．２４kcal／ｍ・hr・℃未満では所望の氷上特
性が得られず、硬度Ｈｓ（０℃）は７０を超えると氷上
性能にマイナス効果を与えるおそれがあるので好ましく
ない。The rubber composition constituting the cap tread portion of the pneumatic tire of the present invention contains the first, second and third components as essential components, and the rubber composition has a thermal conductivity of 0.24 kcal / m · hr · ° C or higher, preferably 0.24 to
0.6, the hardness Hs (0 ° C.) is preferably 70 or less,
More preferably, it is 45 to 65. If the thermal conductivity of the rubber composition is less than 0.24 kcal / m · hr · ° C, the desired on-ice properties cannot be obtained, and if the hardness Hs (0 ° C) exceeds 70, the on-ice performance may be adversely affected. Not preferable.
【００１１】本発明の空気入りタイヤのキャップトレッ
ド用ゴム組成物には前記必須成分に加えて、硫黄、加硫
促進剤、老化防止剤、充填剤、軟化剤、可塑剤などのタ
イヤ用に一般に配合されている各種添加剤を配合するこ
とができ、かかる配合物は一般的な方法で加硫してタイ
ヤトレッドを製造することができる。これらの添加剤の
配合量も一般的な量とすることができる。例えば、硫黄
の配合量はゴム１００重量部当り０．５重量部以上とす
るのが好ましく、０．８〜２．０重量部とするのが更に
好ましい。In addition to the above essential components, the rubber composition for a pneumatic tire cap tread of the present invention is generally used for tires such as sulfur, vulcanization accelerators, antioxidants, fillers, softeners and plasticizers. Various additives that have been compounded can be compounded, and the compound can be vulcanized by a general method to produce a tire tread. The compounding amount of these additives may be a general amount. For example, the blending amount of sulfur is preferably 0.5 parts by weight or more, and more preferably 0.8 to 2.0 parts by weight, based on 100 parts by weight of rubber.
【００１２】本発明に従えば、ゴム組成物の熱伝導率を
高めてタイヤの氷上性能を向上させる。自動車タイヤ下
の氷上路面の水膜は、主としてタイヤによる圧力と熱に
より氷が溶解してできるが、本発明では熱による融解を
防止して氷上性能を向上させるものである。このため、
本発明では高熱伝導性ゴムをタイヤトレッドに使用し
た。なお発熱を抑えようとして、カーボンブラックの配
合量を減少させるなどしてｔａｎδを低減させたので
は、熱伝導率は低下する方向であり、更にドライ及びウ
ェット性能の悪化を引き起こすので好ましくない。然る
に本発明ではこの問題をゴム組成物に導電性カーボンの
配合等によってこの問題を解決したものである。According to the present invention, the thermal conductivity of the rubber composition is increased to improve the on-ice performance of the tire. The water film on the road surface on the ice under the automobile tire is formed mainly by melting the ice due to the pressure and heat from the tire, but in the present invention, the melting due to heat is prevented and the performance on ice is improved. For this reason,
In the present invention, a high thermal conductive rubber is used for the tire tread. It should be noted that if tan δ is reduced by reducing the blending amount of carbon black in an attempt to suppress heat generation, the thermal conductivity tends to decrease, and further dry and wet performances are deteriorated, which is not preferable. However, in the present invention, this problem is solved by blending the conductive carbon in the rubber composition.
【００１３】[0013]
【実施例】以下、実施例及び比較例に従って本発明を更
に詳しく説明するが、本発明の技術的範囲をこれらの実
施例に限定するものでないことは言うまでもない。実施例及び比較例 表Ｉに示す配合内容（重量部）でそれぞれの成分を配合
し、加硫促進剤と硫黄を除く原料ゴム及び配合剤を１．
７リットルのバンバリーミキサーで５分間混合した後、
この混合物に加硫促進剤と硫黄とを８インチの試験用練
りロール機で４分間混練し、ゴム組成物を得た。これら
のゴム組成物を１６０℃で１５分間プレス加硫して、目
的とする試験片を調製し、各種試験を行い、その物性を
測定した。得られた加硫物の物性は表Ｉに示す通りであ
る。更に比較例１〜８及び実施例１〜４の配合物を一般
的な構造の空気入りラジアルタイヤ（サイズ：１８５／
７０Ｒ１３）を取り付けたテスト車（国産のＦＦセダン
車）でもって後述の条件で走行した際の氷上発進性能
（予走）を測定して表Ｉに示した。The present invention will be described in more detail below with reference to Examples and Comparative Examples, but it goes without saying that the technical scope of the present invention is not limited to these Examples. Examples and Comparative Examples Each component was blended according to the blending content (parts by weight) shown in Table I, and the vulcanization accelerator and the raw material rubber excluding sulfur and the blending agent were 1.
After mixing for 5 minutes with a 7 liter Banbury mixer,
A vulcanization accelerator and sulfur were kneaded with this mixture for 4 minutes with an 8-inch test kneading roll machine to obtain a rubber composition. These rubber compositions were press-vulcanized at 160 ° C. for 15 minutes to prepare target test pieces, various tests were conducted, and the physical properties were measured. The physical properties of the obtained vulcanizate are shown in Table I. Further, the formulations of Comparative Examples 1 to 8 and Examples 1 to 4 were used to prepare a pneumatic radial tire having a general structure (size: 185 /
70R13) was mounted on a test vehicle (domestic FF sedan vehicle), and the starting performance on ice (preliminary run) was measured and the results are shown in Table I.
【００１４】（１）比較例及び実施例中の配合剤につい
て １）ＮＲ … ＳＩＲ−２０（Ｔｇ＝−７１℃） ２）ＢＲ … 日本ゼオン（株）製“Ｎｉｐｏｌ １２
２０”（Ｔｇ＝−１０６℃） ３）カーボンブラック−１ … 揮発分＝１．８％，水
素分０．３％，Ｎ2 ＳＡ＝１３２m2／ｇ，２４Ｍ４ＤＢ
Ｐ＝１００ml／１００mg ４）カーボンブラック−２ … 揮発分＝２．０％，水
素分０．３％，Ｎ2 ＳＡ＝９２m2／ｇ，２４Ｍ４ＤＢＰ
＝１０１ml／１００mg ５）カーボンブラック−３ … 揮発分＝１．４％，水
素分０．４％，Ｎ2 ＳＡ＝４４m2／ｇ，２４Ｍ４ＤＢＰ
＝７５ml／１００mg ６）導電性カーボン … 電気化学工業（株）製“デン
カブラック”（アセチレンブラック；揮発分＝０．２
％，炭素分９９．８１％，水素分＝０．０４％，結晶子
の大きさ＝４０〜５０オングストローム）(1) Concerning compounding ingredients in comparative examples and examples 1) NR ... SIR-20 (Tg = -71 ° C.) 2) BR ... "Nipol 12" manufactured by Nippon Zeon Co., Ltd.
20 ″ (Tg = −106 ° C.) 3) Carbon black-1 ... Volatile content = 1.8%, Hydrogen content 0.3%, N 2 SA = 132 m 2 / g, 24M4DB
P = 100 ml / 100 mg 4) Carbon black-2 ... Volatile content = 2.0%, hydrogen content 0.3%, N 2 SA = 92 m 2 / g, 24M4DBP
= 101 ml / 100 mg 5) Carbon black-3 ... Volatile content = 1.4%, hydrogen content 0.4%, N 2 SA = 44 m 2 / g, 24M4DBP
= 75 ml / 100 mg 6) Conductive carbon ... Denka Black manufactured by Denki Kagaku Kogyo Co., Ltd. (acetylene black; volatile content = 0.2)
%, Carbon content 99.81%, hydrogen content = 0.04%, crystallite size = 40 to 50 Å)
【００１５】（注）カーボンブラック及び導電性カーボ
ンの特性の測定方法 （ａ）窒素比表面積（Ｎ2 ＳＡ） ASTM-D3037-78 "Standard Methods of Treating Carbon
Black-Surface Area by Nitrogen Adsorption" Method
Cによる。 （ｂ）２４Ｍ４ＤＢＰ吸油量 ＡＳＴＭ−Ｄ−３４９３による。 （ｃ）揮発分 ＪＩＳ Ｋ−６２２１−１９８２による。 （ｄ）炭素分 通常の元素分析により、含有量を求める。 （ｅ）水素分 サンプルを１０５℃×２時間で乾燥させた後、１５００
℃でガス化させ、発生したガスをＧＣ（ガスクロマトグ
ラフィー）で分析して求める。 （ｆ）結晶子の大きさ Ｘ線回析により、結晶子の厚さ及び幅を求める。(Note) Method of measuring characteristics of carbon black and conductive carbon (a) Nitrogen specific surface area (N 2 SA) ASTM-D3037-78 "Standard Methods of Treating Carbon
Black-Surface Area by Nitrogen Adsorption "Method
By C. (B) 24M4DBP oil absorption amount According to ASTM-D-3493. (C) Volatile content According to JIS K-6221-1982. (D) Carbon content Determine the content by ordinary elemental analysis. (E) Hydrogen content After drying the sample at 105 ° C. for 2 hours, 1500
It is gasified at ° C, and the generated gas is analyzed and analyzed by GC (gas chromatography). (F) Crystallite size The crystallite thickness and width are determined by X-ray diffraction.
【００１６】７）アルミナ … 平均粒径１００μｍ ８）アロマチックオイル … 共同石油（株）製“プロ
セスオイル Ｘ−１４０” ９）亜鉛華 … 正同化学（株）製“亜鉛華３号” １０）ステアリン酸 … 花王石鹸（株）製“Ｌｕｎａ
ｃ ＹＡ” １１）老化防止剤 … Ｎ−フェニル−Ｎ′−（１，３
−ジメチル）−ｐ−フェニレンジアミン（住友化学工業
（株）製“アンチゲン６Ｃ”） １２）ワックス … 大内新興化学（株）製“サンノッ
ク” １３）イオウ … 油処理イオウ １４）加硫促進剤 … Ｎ−ｔｅｒｔ−ブチル−２−ベ
ンゾチアゾリル−スルフェンアミド（大内新興化学
（株）製“ノクセラー ＮＳ−Ｆ”）7) Alumina: average particle size 100 μm 8) Aromatic oil: “Process Oil X-140” manufactured by Kyodo Oil Co., Ltd. 9) Zinc flower: “Zinc flower No. 3” manufactured by Shodo Kagaku Co., Ltd. 10) Stearic acid: "Luna manufactured by Kao Soap Co., Ltd.
c YA "11) Antiaging agent ... N-phenyl-N '-(1,3
-Dimethyl) -p-phenylenediamine (Sumitomo Chemical Co., Ltd. "Antigen 6C") 12) Wax ... Ouchi Shinko Chemical Co., Ltd. "Sunnock" 13) Sulfur ... Oil treatment sulfur 14) Vulcanization accelerator ... N-tert-butyl-2-benzothiazolyl-sulfenamide (“NOXCELLER NS-F” manufactured by Ouchi Shinko Chemical Co., Ltd.)
【００１７】（２）性能評価方法について 〔１〕熱伝導率（２５℃） 迅速熱伝導率計（昭和電工（株）製）を用いて、温度２
５℃の条件下で測定した（単位：kcal／ｍ・ｈ・℃）。 〔２〕Ｈｓ（０℃） ＪＩＳ Ｋ−６３０１に準じて、温度０℃のときの硬度
を測定した。 〔３〕ランボーン摩耗 ランボーン摩耗試験機（岩本製作所（株）製）を用い
て、温度２０℃の所定の条件で摩耗減量を測定し、比較
例１の値を１００として指数表示した。数値が大きい
程、耐摩耗性が良好であることを示す。(2) Performance Evaluation Method [1] Thermal Conductivity (25 ° C.) Using a rapid thermal conductivity meter (Showa Denko KK), temperature 2
It was measured under the condition of 5 ° C (unit: kcal / m · h · ° C). [2] Hs (0 ° C.) The hardness at a temperature of 0 ° C. was measured according to JIS K-6301. [3] Lambourn Abrasion Using a Lambourn abrasion tester (manufactured by Iwamoto Seisakusho Co., Ltd.), the abrasion loss was measured under a predetermined condition of a temperature of 20 ° C., and the value of Comparative Example 1 was set to 100 and displayed as an index. The larger the value, the better the wear resistance.
【００１８】〔４〕氷上発進（予走） 一般道を５０km走行した直後に氷盤上に停車し、発進か
ら５０ｍ先に到達するまでの時間を測定し、比較例１の
値を１００として指数表示した。数値が大きい程、短時
間すなわち発進性が良好であることを示す。[4] Starting on ice (preliminary run) The vehicle was stopped on the ice board immediately after traveling 50 km on a general road, and the time required to reach 50 m ahead from the start was measured. displayed. The larger the value, the shorter the time, that is, the better the starting performance.
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【発明の効果】表Ｉの結果から明らかなように、比較例
１は従来のキャップコンパウンドの標準例を示し、これ
を標準として他の実施例及び比較例の評価をした。実施
例１〜４は本発明例を示し、表Ｉに示すように、熱伝導
率が向上して氷上発進性が改良でき、ランボーン摩耗も
良好である。As is clear from the results of Table I, Comparative Example 1 shows a standard example of a conventional cap compound, and the other Examples and Comparative Examples were evaluated using this as a standard. Examples 1 to 4 show examples of the present invention, and as shown in Table I, the thermal conductivity is improved, the startability on ice can be improved, and the Lambourn wear is also good.
【００２１】これに対し、比較例２及び３は本発明の規
定配合量を超える導電性カーボンを用いた例で氷上性は
良いものの、耐摩耗性が大きく劣る。比較例４及び５は
導電性カーボンを配合しない例で氷上性の改良効果が認
められない。比較例６は実施例２に対し、規定外のカー
ボンブラックを組み合わせた例で耐摩耗性が大きく劣
る。比較例７及び８はアルミナを配合した例で熱伝導率
の向上効果が小さく、氷上性の改良効果が殆どない。On the other hand, Comparative Examples 2 and 3 are examples in which the conductive carbon in an amount exceeding the specified amount according to the present invention is used, but the on-ice property is good, but the wear resistance is greatly inferior. Comparative Examples 4 and 5 are examples in which conductive carbon is not added, and the effect of improving the on-ice property is not recognized. Comparative Example 6 is an example in which non-specified carbon black is combined with Example 2, and wear resistance is greatly inferior. Comparative Examples 7 and 8 are examples in which alumina is blended, and the effect of improving the thermal conductivity is small, and the effect of improving the on-ice property is scarce.
Claims (1)
i）揮発分０．５重量％以下、炭素分９８重量％以上、
水素分０．２重量％以下の導電性カーボンブラック３〜
５０重量部並びに（iii)揮発分０．５重量％超、水素分
０．２重量％超、窒素比表面積（Ｎ2 ＳＡ）７０m2／ｇ
以上及び２４Ｍ４ＤＢＰ吸油量８０ml／１００ｇ以上の
カーボンブラック１０〜６５重量部を含む熱伝導率が
０．２４kcal／ｍ・hr・℃以上のゴム組成物からキャッ
プトレッド部を構成したことを特徴とする空気入りタイ
ヤ。1. (i) 100 parts by weight of diene rubber, (i
i) Volatile content of 0.5% by weight or less, carbon content of 98% by weight or more,
Conductive carbon black with a hydrogen content of 0.2% by weight or less 3 to
50 parts by weight and (iii) more than 0.5% by weight of volatile matter, more than 0.2% by weight of hydrogen, nitrogen specific surface area (N 2 SA) 70 m 2 / g
Air having a cap tread portion composed of a rubber composition having a thermal conductivity of 0.24 kcal / m · hr · ° C or more containing 10 to 65 parts by weight of carbon black having the above and 24 M4 DBP oil absorption of 80 ml / 100 g or more. Included tires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00139895A JP3531989B2 (en) | 1995-01-09 | 1995-01-09 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00139895A JP3531989B2 (en) | 1995-01-09 | 1995-01-09 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08188672A true JPH08188672A (en) | 1996-07-23 |
| JP3531989B2 JP3531989B2 (en) | 2004-05-31 |
Family
ID=11500394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00139895A Expired - Fee Related JP3531989B2 (en) | 1995-01-09 | 1995-01-09 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3531989B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11293035A (en) * | 1998-04-09 | 1999-10-26 | Ohtsu Tire & Rubber Co Ltd :The | Rubber composition for tire |
| WO2004013222A1 (en) * | 2002-07-31 | 2004-02-12 | The Yokohama Rubber Co., Ltd. | Rubber composition, and pneumatic tire using the composition |
| US6827772B2 (en) | 2002-05-24 | 2004-12-07 | Cabot Corporation | Carbon black and compositions containing same |
| WO2007042118A1 (en) * | 2005-10-14 | 2007-04-19 | Continental Aktiengesellschaft | Vehicle tire with cap/base tread |
| US7337815B2 (en) * | 2004-01-20 | 2008-03-04 | The Goodyear Tire & Rubber Company | Tire with tread of rubber composition containing diverse carbon blacks |
| JP2008223343A (en) * | 2007-03-13 | 2008-09-25 | Sekisui Seikei Ltd | Method of fixing tatami mat surface |
| US7640957B2 (en) * | 2005-09-23 | 2010-01-05 | The Goodyear Tire & Rubber Company | Tire with rubber tread highly loaded with a combination of filler reinforcement and oil |
| JP2014095012A (en) * | 2012-11-08 | 2014-05-22 | Sumitomo Rubber Ind Ltd | Rubber composition and pneumatic tire |
| WO2021133407A1 (en) * | 2019-12-27 | 2021-07-01 | Compagnie Generale Des Etablissements Michelin | Rubber mix with high specific surface area and high structure acetylene carbon black |
-
1995
- 1995-01-09 JP JP00139895A patent/JP3531989B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11293035A (en) * | 1998-04-09 | 1999-10-26 | Ohtsu Tire & Rubber Co Ltd :The | Rubber composition for tire |
| US6827772B2 (en) | 2002-05-24 | 2004-12-07 | Cabot Corporation | Carbon black and compositions containing same |
| WO2004013222A1 (en) * | 2002-07-31 | 2004-02-12 | The Yokohama Rubber Co., Ltd. | Rubber composition, and pneumatic tire using the composition |
| US7337815B2 (en) * | 2004-01-20 | 2008-03-04 | The Goodyear Tire & Rubber Company | Tire with tread of rubber composition containing diverse carbon blacks |
| US7640957B2 (en) * | 2005-09-23 | 2010-01-05 | The Goodyear Tire & Rubber Company | Tire with rubber tread highly loaded with a combination of filler reinforcement and oil |
| WO2007042118A1 (en) * | 2005-10-14 | 2007-04-19 | Continental Aktiengesellschaft | Vehicle tire with cap/base tread |
| JP2009511329A (en) * | 2005-10-14 | 2009-03-19 | コンチネンタル アクチェンゲゼルシャフト | Pneumatic vehicle tire with cap / base tread |
| JP2008223343A (en) * | 2007-03-13 | 2008-09-25 | Sekisui Seikei Ltd | Method of fixing tatami mat surface |
| JP2014095012A (en) * | 2012-11-08 | 2014-05-22 | Sumitomo Rubber Ind Ltd | Rubber composition and pneumatic tire |
| WO2021133407A1 (en) * | 2019-12-27 | 2021-07-01 | Compagnie Generale Des Etablissements Michelin | Rubber mix with high specific surface area and high structure acetylene carbon black |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3531989B2 (en) | 2004-05-31 |
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