JPH1035212A - Pnematic tire - Google Patents
Pnematic tireInfo
- Publication number
- JPH1035212A JPH1035212A JP8215136A JP21513696A JPH1035212A JP H1035212 A JPH1035212 A JP H1035212A JP 8215136 A JP8215136 A JP 8215136A JP 21513696 A JP21513696 A JP 21513696A JP H1035212 A JPH1035212 A JP H1035212A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- weight
- parts
- weight part
- outer layer
- 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
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気入りタイヤに
関し、詳しくは、カーカスの側面を被覆保護するサイド
ウォールが外層と内層とでゴム質の異なる２層構造を有
し、耐サイドカット性等の耐外傷性を損うことなくサイ
ド部の外観性と耐オゾンクラック性の双方が良好な状態
に保たれた空気入りタイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire, in which a side wall for covering and protecting a side surface of a carcass has a two-layer structure in which an outer layer and an inner layer have different rubber qualities, and is resistant to side cuts. The present invention relates to a pneumatic tire in which both the appearance and the ozone crack resistance of the side portions are kept in a good state without impairing the scratch resistance.
【０００２】[0002]
【従来の技術】従来、空気入りタイヤのサイドウォール
は、主鎖中の二重結合の含有割合の高い天然ゴム、イソ
プレンゴム、ブタジエンゴム、スチレン−ブタジエンゴ
ムなどの高不飽和度ゴムを主要ゴム成分とするゴム組成
物で形成されていた。かかる高不飽和度ゴムの二重結合
部分はオゾンと反応して解重合する性質があるので、放
置または走行により、ゴム表面におけるクラック発生の
原因となることが知られている。そこで、これを防ぐた
めに、これまではサイドウォールのゴム組成物にはアミ
ン系の老化防止剤やワックス等のクラック改良剤が配合
されていた。しかしながら、アミン系老化防止剤はサイ
ドウォール表面にブルームすると茶褐色に変色する特徴
があり、またワックスは表面にブルームすると白色を呈
し、いずれの場合も、サイド外観を損ねてしまうという
問題があった。2. Description of the Related Art Conventionally, sidewalls of pneumatic tires are made of a highly unsaturated rubber such as natural rubber, isoprene rubber, butadiene rubber, and styrene-butadiene rubber having a high content of double bonds in the main chain. It was formed of a rubber composition as a component. It is known that the double bond portion of such a highly unsaturated rubber has a property of depolymerizing by reacting with ozone, and thus, it may cause cracks on the rubber surface when left or run. Thus, in order to prevent this, a rubber composition for the sidewall has heretofore been compounded with an amine-based antioxidant or a crack modifier such as wax. However, the amine-based anti-aging agent has a feature that when it blooms on the side wall surface, it changes color to brown, and when the wax blooms on the surface, it shows a white color, and in any case, there is a problem that the side appearance is impaired.
【０００３】かかる問題点を解決すべく、例えば、特開
昭５９−１４５０２号公報においては、タイヤサイド部
を内外２層構造とし、外層を、不飽和結合の含有量の少
ないゴムを使用して変色の原因物質を減量したゴム組成
物で構成することが提案されている。In order to solve such a problem, for example, in Japanese Patent Application Laid-Open No. Sho 59-14502, a tire side portion has an inner / outer two-layer structure, and an outer layer is formed by using a rubber having a low unsaturated bond content. It has been proposed that the substance causing discoloration be composed of a reduced rubber composition.
【０００４】[0004]
【発明が解決しようとする課題】上記特開昭５９−１４
５０２号公報に開示されている如き従来の２層サイド構
造は、外層は不飽和結合の含有量の少ないゴムを使用し
ていても、内層には通常のサイドウォールをベースとし
たゴム組成物を使用していたため、該内層はアミン系老
化防止剤やワックス等が使用された配合系となってい
た。SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 59-14 / 1984
In the conventional two-layer side structure disclosed in Japanese Patent Publication No. 502-502, a rubber composition based on a normal sidewall is used for the inner layer even if the outer layer uses a rubber having a low unsaturated bond content. Since it was used, the inner layer was a compounded system using an amine-based antioxidant, wax, and the like.
【０００５】これらの物質は拡散速度が非常に速いとい
う特性を有しているため、例え外層に老化防止剤やワッ
クス等が使用されていないゴム組成物を使用しても、す
ぐに外層にまでこれら物質が移行し、結局は変色を引き
起こしていた。それどころか、外層表面に移行した老化
防止剤やワックス等は従来の単層サイドウォールよりも
却ってより大きな変色を引き起こしていた。従って、内
層ゴムに従来のサイドウォールゴムの老化防止剤やワッ
クスを減量した組成物を使用した２層サイド構造におい
ては、例え外層に老化防止剤やワックスが未使用の組成
物を使用したとしても、十分な外観性の向上は得られな
いのが実状であった。[0005] Since these substances have the property that the diffusion rate is very high, even if a rubber composition in which an antioxidant or wax is not used in the outer layer, even if the rubber composition does not use the outer layer, it immediately reaches the outer layer. These substances migrated, eventually causing discoloration. On the contrary, the antioxidant, wax, and the like transferred to the outer layer surface have caused much greater discoloration than the conventional single-layer sidewall. Therefore, in a two-layer side structure using a composition in which the conventional anti-aging agent and wax of the sidewall rubber are reduced in the inner layer rubber, even if the anti-aging agent and the wax-free composition are used in the outer layer, In fact, a sufficient improvement in appearance was not obtained.
【０００６】そこで本発明の目的は、タイヤの耐サイド
カット性等の耐外傷性を損うことなくサイド部の外観性
と耐オゾンクラック性の双方が良好な状態に保たれた空
気入りタイヤを提供することにある。Accordingly, an object of the present invention is to provide a pneumatic tire in which both side appearance and ozone crack resistance are maintained in a good state without impairing trauma resistance such as side cut resistance of the tire. To provide.
【０００７】[0007]
【課題を解決するための手段】本発明者は、上記課題を
解決すべく鋭意検討した結果、サイドウォールを２層構
造とし、外層ゴムの特定の低不飽和度ゴムの割合を高
め、一方内層ゴムでは特定の高不飽和度ゴムの割合を高
め、かつ両層に配合される特定の老化防止剤およびワッ
クスの配合量を所定量以下に抑えることにより、上記目
的を達成し得ることを見出し、本発明を完成するに至っ
た。Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has found that the side wall has a two-layer structure, the ratio of the specific low unsaturated rubber in the outer rubber is increased, and In rubber, it has been found that the above-mentioned object can be achieved by increasing the proportion of a specific high-unsaturation rubber and suppressing the amount of a specific antioxidant and wax compounded in both layers to a predetermined amount or less, The present invention has been completed.
【０００８】即ち、本発明の空気入りタイヤは、サイド
ウォールが外層と内層とでゴム質の異なる２層構造を有
する空気入りタイヤにおいて、上記外層がゴム成分１０
０重量部対して、ハロゲン化ブチルゴム及びエチレンプ
ロピレンゴムからなる群から選ばれた低不飽和度ゴムの
少なくとも１種３０〜７０重量部と、天然ゴム、イソプ
レンゴム、ブタジエンゴム及びスチレン−ブタジエンゴ
ムからなる群から選ばれた高不飽和度ゴムの少なくとも
１種７０〜３０重量部とを配合してなるゴム組成物で構
成され、上記内層がゴム成分１００重量部対して、上記
低不飽和度ゴム群から選ばれたゴムの少なくとも１種０
〜４０重量部と、上記高不飽和度ゴム群の少なくとも１
種１００〜６０重量部とを配合してなるゴム組成物で構
成され、上記内層および外層のゴム組成物ともにフェニ
レンジアミン系老化防止剤がゴム成分１００重量部に対
して０．５重量部以下で、かつワックスが０．５重量部
以下で配合されてなることを特徴とするものである。That is, in the pneumatic tire of the present invention, in a pneumatic tire having a two-layer structure in which sidewalls have different rubber properties between an outer layer and an inner layer, the outer layer has a rubber component of 10%.
0 parts by weight, at least one 30 to 70 parts by weight of a low-unsaturation rubber selected from the group consisting of halogenated butyl rubber and ethylene propylene rubber, and natural rubber, isoprene rubber, butadiene rubber and styrene-butadiene rubber. A rubber composition comprising 70 to 30 parts by weight of at least one kind of a highly unsaturated rubber selected from the group consisting of: At least one kind of rubber selected from the group 0
To 40 parts by weight, and at least one of the above-mentioned highly unsaturated rubber groups.
100 to 60 parts by weight of a seed, and the rubber composition of the inner layer and the outer layer contains a phenylenediamine antioxidant in an amount of 0.5 part by weight or less based on 100 parts by weight of the rubber component. And the wax is blended in an amount of 0.5 part by weight or less.
【０００９】[0009]
【発明の実施の形態】以下、本発明の空気入りタイヤを
具体的に説明する。本発明の空気入りタイヤにおいて、
サイドウォールを外層と内層とでゴム質の異なる２層構
造とするのは、外層のゴムには老化防止剤およびワック
スを極少量配合するかまたは配合しないことで耐オゾン
クラック性を良好に保つ機能を持たせ、一方内層のゴム
には耐サイドカット性を良好に保つ機能を持たせるため
である。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a pneumatic tire according to the present invention will be specifically described. In the pneumatic tire of the present invention,
The sidewall has a two-layer structure having different rubber qualities between the outer layer and the inner layer because the rubber of the outer layer contains a very small amount of an antioxidant and a wax or does not contain a wax, so that the ozone crack resistance can be maintained well. This is because the rubber of the inner layer has a function of maintaining good side cut resistance.
【００１０】本発明においては、上述の如く外層のゴム
は老化防止剤およびワックスを極少量配合するかまたは
配合せずに耐オゾンクラック性を良好に維持する必要が
あるので、耐オゾン性に優れたハロゲン化ブチルゴム
（Ｈａｌ−ＩＩＲ）、例えばＣｌ−ＩＩＲ、Ｂｒ−ＩＩ
Ｒ及びエチレンプロピレンゴム（ＥＰＭ）からなる群か
ら選ばれた低不飽和度ゴムの少なくとも１種を３０〜７
０重量部、より十分な耐オゾンクラック性を得るために
は５０〜７０重量部配合することが望ましい。かかる低
不飽和度ゴムを７０重量部を超えて配合すると、ゴム自
体の強力及び周辺ゴムとの接着力の著しい低下を引き起
こし、タイヤ耐久上好ましくない。なお、本発明で低不
飽和度ゴムとして使用し得るエチレンプロピレンゴム
（ＥＰＭ）には、エチレンとプロピレンの他に第三成分
としてジエンモノマーを加え三元共重合体としたゴム
（ＥＰＤＭ）を含むものである。In the present invention, the rubber of the outer layer is excellent in ozone resistance because it is necessary to blend the antiaging agent and wax in a very small amount or to maintain good ozone crack resistance without blending the rubber. Halogenated butyl rubber (Hal-IIR) such as Cl-IIR, Br-II
R and at least one low-unsaturation rubber selected from the group consisting of ethylene propylene rubber (EPM)
In order to obtain 0 parts by weight and more sufficient ozone crack resistance, it is desirable to add 50 to 70 parts by weight. If the low-unsaturated rubber is added in an amount exceeding 70 parts by weight, the strength of the rubber itself and the adhesive strength to the peripheral rubber are significantly reduced, which is not preferable in terms of tire durability. The ethylene propylene rubber (EPM) that can be used as the low unsaturated rubber in the present invention includes a rubber (EPDM) obtained by adding a diene monomer as a third component in addition to ethylene and propylene to form a terpolymer. It is a thing.
【００１１】上述の如く、外層のゴムはタイヤサイド部
の耐オゾンクラック性に重点をおいているため、従来の
高不飽和度ゴムのサイドウォールに比し、耐サイドカッ
ト性が劣るものとなっている。従って、本発明において
はこの点を補うために、内層のゴムは耐破壊性を重視し
て上記高不飽和度ゴムを６０重量部以上、好ましくは７
０重量部以上使用する必要がある。As described above, since the rubber of the outer layer focuses on the ozone crack resistance of the tire side portion, the side cut resistance is inferior to that of the conventional high unsaturated rubber sidewall. ing. Therefore, in the present invention, in order to compensate for this point, the rubber of the inner layer is made of the above-mentioned highly unsaturated rubber at 60 parts by weight or more, preferably 7 parts by weight with emphasis on fracture resistance.
It is necessary to use at least 0 parts by weight.
【００１２】また、本発明においては、十分な外観性を
確保するために、外層のみならず内層のアミン系老化防
止剤およびワックスの配合量もそれぞれゴム成分１００
重量部に対し０．５重量部以下、好ましくは未配合とす
る必要がある。これは上述の如く、老化防止剤およびワ
ックスがゴム中での拡散速度が速く、例え内層ゴムにの
み使用してもすぐにブルームし、外観性を悪化させるか
らである。In the present invention, in order to ensure a sufficient appearance, not only the outer layer but also the inner layer of the amine-based antioxidant and the wax are blended with the rubber component 100, respectively.
0.5 parts by weight or less based on parts by weight, preferably not blended. This is because, as described above, the diffusion rate of the antioxidant and the wax in the rubber is high, and even if it is used only for the inner layer rubber, it blooms immediately and deteriorates the appearance.
【００１３】なお、内層ゴムの破壊性維持を目的としフ
ェノール系老化防止剤を使用することは可能である。Incidentally, it is possible to use a phenolic antioxidant for the purpose of maintaining the destructibility of the inner rubber layer.
【００１４】本発明においては、サイドウォールの外層
と内層のゴム組成物には上述の配合成分の他に、カーボ
ンブラック、シリカ等の無機充填剤、軟化剤、加硫剤、
加硫促進剤、加硫促進助剤等、通常配合される適当量の
配合剤を適宜配合することができるのは勿論のことであ
る。In the present invention, in addition to the above-mentioned components, an inorganic filler such as carbon black and silica, a softening agent, a vulcanizing agent,
Needless to say, a proper amount of a compounding agent usually compounded, such as a vulcanization accelerator and a vulcanization accelerator, can be appropriately compounded.
【００１５】次に、本発明の一例空気入りタイヤを図面
に基づき説明する。図１に示す本発明の一例空気入りラ
ジアルタイヤ１において、サイドウォール部は外層２と
内層３の２層構造となっており、タイヤ側面のカーカス
４を覆っている。なお、図中、５はベルト部である。Next, an example pneumatic tire of the present invention will be described with reference to the drawings. In the example pneumatic radial tire 1 of the present invention shown in FIG. 1, the sidewall portion has a two-layer structure of an outer layer 2 and an inner layer 3 and covers a carcass 4 on a side surface of the tire. In the drawing, reference numeral 5 denotes a belt portion.
【００１６】本発明においては、上記外層２と内層３と
のゲージ比は、好ましくは１：１〜１：２である。In the present invention, the gauge ratio between the outer layer 2 and the inner layer 3 is preferably 1: 1 to 1: 2.
【００１７】[0017]
【実施例】以下に、本発明を実施例および比較例に基づ
き具体的に説明する。 （１）外層配合の検討 タイヤのサイドウォールにおける外層用ゴムの検討をす
るために、下記の表１に示す配合内容の各種ゴム組成物
Ａ〜Ｊを調製した。これらゴム組成物について耐オゾン
クラック性、変色性、破壊強力およびゴム〜ゴム間接着
性について以下のようにして測定試験を行った。The present invention will be specifically described below based on examples and comparative examples. (1) Examination of outer layer composition In order to study the rubber for the outer layer in the sidewall of the tire, various rubber compositions A to J having the composition shown in Table 1 below were prepared. These rubber compositions were subjected to measurement tests for ozone crack resistance, discoloration, breaking strength, and adhesion between rubber and rubber as follows.
【００１８】（イ）耐オゾンクラック性および変色性 得られたゴム組成物を１６０℃、２０分間プレス加硫し
て得たられ試験片を使用し、温度４０℃、オゾン濃度５
０ｐｐｈｍの低濃度オゾンを含む空気中において、０〜
２０％間、５Ｈｚの繰り返し歪を与え、クラック発生ま
での時間と、２４時間経過後の変色度合を測定した。耐
オゾンクラックの評価は、Ａは少数、Ｂは多数、Ｃは無
数にクラックが発生したことを示し、また１は１０倍の
ルーペで確認可能、２は肉眼で確認可能、３は亀裂１ｍ
ｍ未満、４は１〜３ｍｍの亀裂、５は３ｍｍ以上の亀
裂、をそれぞれ示している。変色の評価としては、明ら
かに差の分かるものを変色大、変化が多少認められるも
のを変色小、それらの中間を変色中、変化の認められな
いものを不変として評価した。(A) Ozone crack resistance and discoloration resistance A test piece obtained by press-vulcanizing the obtained rubber composition at 160 ° C. for 20 minutes was used, at a temperature of 40 ° C. and an ozone concentration of 5
In air containing 0 ppm of low concentration ozone,
A repeated strain of 5 Hz was applied for 20%, and the time until crack generation and the degree of discoloration after 24 hours were measured. The evaluation of ozone cracking resistance was as follows: A indicates a small number, B indicates a large number, C indicates an infinite number of cracks, 1 indicates that it can be confirmed with a 10-fold loupe, 2 indicates that it can be visually confirmed, and 3 indicates a crack of 1 m.
Less than m, 4 indicates a crack of 1 to 3 mm, and 5 indicates a crack of 3 mm or more. As for the evaluation of discoloration, those with a clear difference were evaluated as large discoloration, those with some change were evaluated as small discoloration, those in between were evaluated as discoloration, and those with no change were evaluated as invariant.
【００１９】（ロ）破壊強力 上記試験片を用いて、ＪＩＳ Ｋ ６３０１に準拠して
破壊強力を測定した。(B) Breaking strength The breaking strength was measured using the above test pieces in accordance with JIS K6301.
【００２０】（ハ）ゴム〜ゴム間接着性 有機繊維で裏打ちした試験ゴムシートをゴム〜ゴム間剥
離ができるように重ねて成形した試料をプランジャータ
イプの金型で１６０℃×２０分加硫し、得られたものを
幅１ｃｍに切断した後、ゴム〜ゴム間の接着状態を観察
した。結果を下記の表１に併記する。(C) Adhesion between rubber and rubber A test rubber sheet lined with an organic fiber was laminated and molded so as to allow separation between rubber and rubber, and a sample was vulcanized at 160 ° C. for 20 minutes using a plunger type mold. Then, the obtained product was cut into a width of 1 cm, and the adhesion state between rubber and rubber was observed. The results are also shown in Table 1 below.
【００２１】[0021]
【表１】 １）Ｎ−フェニル−Ｎ’−イソプロピル−ｐ−フェニレ
ンジアミン ２）Ｎ−シクロヘキシル−２−ベンゾチアジルスルフェ
ンアミド ３）ジベンゾチアジルジスルフィド[Table 1] 1) N-phenyl-N'-isopropyl-p-phenylenediamine 2) N-cyclohexyl-2-benzothiazylsulfenamide 3) dibenzothiazyl disulfide
【００２２】上記表１に示す結果より、外層ゴムとして
十分な耐オゾンクラック性と外観性を両立させるために
はＨ〜Ｊのゴム組成物が適当であることが確かめられ
た。From the results shown in Table 1 above, it was confirmed that the rubber compositions H to J are suitable for achieving both sufficient ozone crack resistance and appearance as the outer layer rubber.
【００２３】（２）内層ゴムとの組み合わせ検討 上記Ｈ〜Ｊのゴム組成物をタイヤのサイドウォールにお
ける外層用ゴムとして用い、一方内層用ゴムとしては下
記の表２に示す配合内容のゴム組成物を用い、同表に示
す組み合わせにてサイズ１８５／７０Ｒ１４の空気入り
ラジアルタイヤを製造した。製造された空気入りラジア
ルタイヤについて耐オゾンクラック性、変色性および外
傷性ついて下記のようにして評価を行った。(2) Examination of Combination with Inner Layer Rubber The above rubber compositions H to J are used as the outer layer rubber in the sidewall of the tire, while the inner layer rubber is a rubber composition having the composition shown in Table 2 below. Was used to produce pneumatic radial tires of size 185 / 70R14 in the combinations shown in the table. The produced pneumatic radial tires were evaluated for ozone crack resistance, discoloration and trauma as follows.
【００２４】（Ａ）耐オゾンクラック性および変色性 試験タイヤを屋外ドラムにて５万ｋｍ走行させ、オゾン
クラックの発生状況および変色性について観察を行っ
た。(A) Ozone Crack Resistance and Discoloration The test tire was run for 50,000 km on an outdoor drum, and the occurrence of ozone cracks and discoloration were observed.
【００２５】（Ｂ）耐外傷性 試験タイヤを内圧１ｋｇ／ｃｍ２に設定し、時速１０ｋ
ｍ／ｈで縁石に２０回乗り上げたときのサイド部の状態
を観察した。得られた結果を下記の表２に示す。(B) Trauma resistance The test tire was set at an internal pressure of 1 kg / cm 2 and the speed was 10 k / h.
The state of the side part when riding on the curb 20 times at m / h was observed. The results obtained are shown in Table 2 below.
【００２６】[0026]
【表２】 [Table 2]
【００２７】実施例１〜３の試験結果から分かるよう
に、タイヤサイドウォールの外層に耐オゾンクラック性
を重視した配合系を、一方、内層には耐破壊性を重視し
た配合系をそれぞれ採用したタイヤにおいては、耐オゾ
ンクラック性、変色性、外傷性のすべての性能において
良好な結果が得られた。As can be seen from the test results of Examples 1 to 3, a blend system emphasizing ozone crack resistance was used for the outer layer of the tire sidewall, and a blend system focusing on destruction resistance was used for the inner layer. In the tire, good results were obtained in all of the properties of ozone crack resistance, discoloration, and trauma.
【００２８】一方、比較例１および２のように、内層に
アミン系老化防止剤およびワックスを所定量以上配合し
たゴムを配したタイヤでは変色性が悪化し、また比較例
２および４のように耐オゾンクラック性を重視し過ぎた
配合系を採用してサイド部を構成したタイヤでは十分な
耐久性が得られなかった。On the other hand, in tires in which a rubber in which an amine-based antioxidant and a wax are blended in a predetermined amount or more as in the inner layer as in Comparative Examples 1 and 2, discoloration is deteriorated, and as in Comparative Examples 2 and 4, Sufficient durability could not be obtained with a tire having a side portion formed by using a compounding system that emphasized ozone crack resistance too much.
【００２９】本発明の空気入りタイヤ（実施例２）と、
従来より市販されているタイヤ（比較例１）を同一車輛
に装着し、実地走行２万ｋｍ（約１年後）の状態につい
て検討したところ、耐オゾン性、変色性に関して大幅な
向上が確認された。The pneumatic tire of the present invention (Example 2)
A commercially available tire (Comparative Example 1) was mounted on the same vehicle, and a study was conducted on the condition of actual running 20,000 km (about one year later). As a result, a great improvement in ozone resistance and discoloration was confirmed. Was.
【００３０】[0030]
【発明の効果】以上説明してきたように本発明の空気入
りタイヤにおいては、サイドウォールを２層構造とし、
外層ゴムの特定低不飽和度ゴムの割合を高め、一方内層
ゴムでは特定高不飽和度ゴムの割合を高め、かつ両層に
配合される特定老化防止剤およびワックスの配合量を所
定量以下に抑えたことにより、タイヤの耐サイドカット
性等の耐外傷性を損うことなくサイド部の外観性と耐オ
ゾンクラック性の双方を良好な状態に保持することがで
きる。As described above, in the pneumatic tire of the present invention, the sidewall has a two-layer structure,
The proportion of the specific low unsaturated rubber in the outer rubber is increased, while the proportion of the specific high unsaturated rubber in the inner rubber is increased, and the amount of the specific antioxidant and wax compounded in both layers is less than a predetermined amount. Due to the suppression, both the appearance of the side portion and the ozone crack resistance can be maintained in a good state without impairing the trauma resistance such as the side cut resistance of the tire.
【図１】空気入りラジアルタイヤの左半分断面図であ
る。FIG. 1 is a left half sectional view of a pneumatic radial tire.
１ 大型建設車両用ラジアルタイヤ ２ サイドウォール部外層 ３ サイドウォール部内層 ４ カーカス ５ ベルト部 DESCRIPTION OF SYMBOLS 1 Radial tire for large construction vehicles 2 Side wall outer layer 3 Side wall inner layer 4 Carcass 5 Belt part
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｌ 9/00 Ｃ０８Ｌ 9/00 9/06 9/06 11/00 11/00 19/00 ＬＢＤ 19/00 ＬＢＤ ──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI Technical indication location C08L 9/00 C08L 9/00 9/06 9/06 11/00 11/00 19/00 LBD 19 / 00 LBD
Claims (1)
の異なる２層構造を有する空気入りタイヤにおいて、 上記外層がゴム成分１００重量部対して、ハロゲン化ブ
チルゴム及びエチレンプロピレンゴムからなる群から選
ばれた低不飽和度ゴム群の少なくとも１種３０〜７０重
量部と、天然ゴム、イソプレンゴム、ブタジエンゴム及
びスチレン−ブタジエンゴムからなる群から選ばれた高
不飽和度ゴムの少なくとも１種７０〜３０重量部とを配
合してなるゴム組成物で構成され、 上記内層がゴム成分１００重量部対して、上記低不飽和
度ゴムの少なくとも１種０〜４０重量部と、上記高不飽
和度ゴムの少なくとも１種１００〜６０重量部とを配合
してなるゴム組成物で構成され、 上記内層および外層のゴム組成物ともにフェニレンジア
ミン系老化防止剤がゴム成分１００重量部に対して０．
５重量部以下で、かつワックスが０．５重量部以下で配
合されてなることを特徴とする空気入りタイヤ。1. A pneumatic tire in which a sidewall has a two-layer structure having different rubber properties between an outer layer and an inner layer, wherein the outer layer is selected from the group consisting of halogenated butyl rubber and ethylene propylene rubber based on 100 parts by weight of the rubber component. 30 to 70 parts by weight of at least one of a low-unsaturation rubber group obtained and at least 70 to 70 of a high-unsaturation rubber selected from the group consisting of natural rubber, isoprene rubber, butadiene rubber and styrene-butadiene rubber. 30 parts by weight of the rubber composition, wherein the inner layer is 100 parts by weight of a rubber component, at least 0 to 40 parts by weight of at least one kind of the low unsaturated rubber, and the high unsaturated rubber. And at least one of 100 to 60 parts by weight of a rubber composition. The antioxidant is used in an amount of 0.1 to 100 parts by weight of the rubber component.
A pneumatic tire characterized in that it is compounded in an amount of 5 parts by weight or less and wax in an amount of 0.5 parts by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21513696A JP3569082B2 (en) | 1996-07-26 | 1996-07-26 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21513696A JP3569082B2 (en) | 1996-07-26 | 1996-07-26 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1035212A true JPH1035212A (en) | 1998-02-10 |
| JP3569082B2 JP3569082B2 (en) | 2004-09-22 |
Family
ID=16667305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21513696A Expired - Fee Related JP3569082B2 (en) | 1996-07-26 | 1996-07-26 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3569082B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6655078B2 (en) | 2001-10-17 | 2003-12-02 | The Coleman Company, Inc. | Insect trapping panel assembly for a mosquito attracting appratus |
| US7082976B2 (en) | 2001-12-11 | 2006-08-01 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire having tread portion formed of two layers |
| JP2014034270A (en) * | 2012-08-08 | 2014-02-24 | Bridgestone Corp | Rubber laminate and tire |
-
1996
- 1996-07-26 JP JP21513696A patent/JP3569082B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6655078B2 (en) | 2001-10-17 | 2003-12-02 | The Coleman Company, Inc. | Insect trapping panel assembly for a mosquito attracting appratus |
| US7082976B2 (en) | 2001-12-11 | 2006-08-01 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire having tread portion formed of two layers |
| JP2014034270A (en) * | 2012-08-08 | 2014-02-24 | Bridgestone Corp | Rubber laminate and tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3569082B2 (en) | 2004-09-22 |
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