JP4405238B2 - Pneumatic tire - Google Patents
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- JP4405238B2 JP4405238B2 JP2003380051A JP2003380051A JP4405238B2 JP 4405238 B2 JP4405238 B2 JP 4405238B2 JP 2003380051 A JP2003380051 A JP 2003380051A JP 2003380051 A JP2003380051 A JP 2003380051A JP 4405238 B2 JP4405238 B2 JP 4405238B2
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Description
本発明は、特定組成のゴム組成物よりなるゴム層をタイヤの特定部位に配設することによって、タイヤの耐久性を著しく高めた空気入りタイヤに関する。 The present invention relates to a pneumatic tire in which the durability of the tire is remarkably enhanced by disposing a rubber layer made of a rubber composition having a specific composition at a specific portion of the tire.
従来より、重荷重用タイヤの補強材としてスチールワイヤーおよび接着系コンパウンドが使用されてきたが、これらのタイヤでは、タイヤ走行による熱、疲労、水分等により、そのゴム−金属界面で接着破壊が生じるという重大な問題があった。これを低減させる方法として、特開平２−２４８２４３号公報や特開平５−１２３８７７号公報などでは、有機コバルト塩等の特定金属塩をスチールコード被覆用ゴム組成物に配合することが報告されている。しかし、未だ、充分な対策が採られているとは言い難い。 Conventionally, steel wires and adhesive compounds have been used as reinforcing materials for heavy duty tires, but in these tires, adhesion failure occurs at the rubber-metal interface due to heat, fatigue, moisture, etc. due to tire running. There was a serious problem. As a method for reducing this, JP-A-2-248243, JP-A-5-123877 and the like report that a specific metal salt such as an organic cobalt salt is blended in a rubber composition for coating a steel cord. . However, it is hard to say that sufficient measures have been taken.
よって、本発明では、上記課題を克服するため、カーカス層とＬフィラー層間および／またはカーカス層とビードフィラー間に、特定量のブタジエンゴム（ＢＲ）およびアミン系老化防止剤、更には所定量の硫黄を配合したゴム組成物からなるゴム層を挿入することにより、水および疲労による接着性の低下を改善し、タイヤの耐久性を向上させた空気入りタイヤを提供することを目的とする。 Therefore, in the present invention, in order to overcome the above-described problems, a specific amount of butadiene rubber (BR) and an amine-based anti-aging agent, and a predetermined amount of a cass layer and an L filler layer and / or between a carcass layer and a bead filler are used. An object of the present invention is to provide a pneumatic tire in which a rubber layer made of a rubber composition blended with sulfur is inserted to improve a decrease in adhesion due to water and fatigue and to improve the durability of the tire.
本発明によれば、天然ゴムまたはイソプレンゴム７０〜０重量部とブタジエンゴム３０〜１００重量部とからなるゴム１００重量部に対して、アミン系老化防止剤３.０〜１０.０重量部を配合したゴム組成物からなるゴム層を、カーカス層とＬフィラー層間および／またはカーカス層とビードフィラー間に挿入した空気入りタイヤが提供される。 According to the present invention, 3.0 to 10.0 parts by weight of an amine anti-aging agent is added to 100 parts by weight of a rubber composed of 70 to 0 parts by weight of natural rubber or isoprene rubber and 30 to 100 parts by weight of butadiene rubber. There is provided a pneumatic tire in which a rubber layer made of a blended rubber composition is inserted between a carcass layer and an L filler layer and / or between a carcass layer and a bead filler.
また、本発明のより有効な態様によれば、天然ゴムまたはイソプレンゴム７０〜０重量部とブタジエンゴム３０〜１００重量部とからなるゴム１００重量部に対して、アミン系老化防止剤３.０〜１０.０重量部および硫黄５.０〜１２.０重量部を配合したゴム組成物からなるゴム層を、カーカス層とＬフィラー層間および／またはカーカス層とビードフィラー間に挿入した空気入りタイヤが提供される。 According to a more effective aspect of the present invention, the amine-based anti-aging agent 3.0 is added to 100 parts by weight of rubber comprising 70 to 0 parts by weight of natural rubber or isoprene rubber and 30 to 100 parts by weight of butadiene rubber. Pneumatic tire in which a rubber layer made of a rubber composition blended with 10.0 parts by weight and 5.0 to 12.0 parts by weight of sulfur is inserted between a carcass layer and an L filler layer and / or between a carcass layer and a bead filler. Is provided.
本発明では、タイヤ部材のゴム−金属界面において、接着剥離の起こり易い部位、特に、カーカスとＬフィラー層間および／またはカーカス層とビードフィラー間に上記特定配合のゴム組成物からなるゴムシートを挿入することで、当該シートが配合剤の部材間におけるマイグレーションを抑制するとともに、当該シートからの隣接部材への老化防止剤、硫黄といった配合剤の移行に伴う疲労における耐接着性を改善するために、更には、ゴム成分としてブタジエンゴムを特定量配合することによりゴム-金属界面への水分の浸透を抑制して耐水接着性を改善するために、タイヤの耐久性を著しく向上させることができることを見出したものである。 In the present invention, at the rubber-metal interface of the tire member, a rubber sheet made of the rubber composition having the above specific composition is inserted between the parts where adhesion peeling easily occurs, in particular, between the carcass and the L filler layer and / or between the carcass layer and the bead filler. In order to suppress the migration between the components of the compounding agent, the anti-aging agent from the sheet to the adjacent member, and to improve the adhesion resistance in fatigue accompanying the transition of the compounding agent such as sulfur, Furthermore, it has been found that by adding a specific amount of butadiene rubber as the rubber component, the durability of the tire can be remarkably improved in order to suppress water penetration into the rubber-metal interface and improve water-resistant adhesion. It is a thing.
本発明における挿入ゴム層を構成するゴム組成物の原料ゴムに使用されるゴムとしては、スチールコードの被覆用に使われるゴムが好適であり、本発明では、特に、天然ゴムまたはイソプレンゴム７０〜０重量部とブタジエンゴム３０〜１００重量部とからなるゴム、好ましくは、天然ゴムまたはイソプレンゴム７０〜３０重量部とブタジエンゴム３０〜７０重量部とからなるブレンドゴムが用いられる。 The rubber used for the raw rubber of the rubber composition constituting the insertion rubber layer in the present invention is preferably a rubber used for coating a steel cord. In the present invention, natural rubber or isoprene rubber 70 to A rubber composed of 0 part by weight and 30 to 100 parts by weight of butadiene rubber, preferably a blend rubber composed of 70 to 30 parts by weight of natural rubber or isoprene rubber and 30 to 70 parts by weight of butadiene rubber is used.
本発明における挿入ゴム層を構成するゴム組成物に配合されるアミン系老化防止剤としては、例えば、Ｎ−フェニル−１−ナフチルアミン、Ｎ−フェニル−２−ナフチルアミン、オクチル化ジフェニルアミン、チオジフェニルアミン、４、４´−ビス（α，α−ジメチルベンジル）ジフェニルアミン、ｐ−（ｐ−トルエンスルホニルアミド）ジフェニルアミン、Ｎ，Ｎ´−ジ−２−ナフチル−ｐ−フェニレンジアミン、Ｎ，Ｎ´−ジフェニル−ｐ−フェニレンジアミン、Ｎ−イソプロピル−Ｎ´−フェニル−ｐ−フェニレンジアミン、Ｎ−（１，３−ジメチルブチル）−Ｎ´−フェニル−ｐ−フェニレンジアミン、Ｎ−シクロヘキシル−Ｎ´−フェニル−ｐ−フェニレンジアミンおよびＮ−（３−メタクリロイルオキシ−２−ヒドロキシルプロピル）−ｐ−フェニレンジアミン等が挙げられる。当該アミン系老化防止剤は、前記ゴム成分１００重量部に対して、通常の配合量より多めに、即ち、３.０〜１０.０重量部、好ましくは４.０〜８.０重量部の量で配合される。このアミン系老化防止剤が３.０重量部未満では耐疲労性が低下し、また、１０.０を超えると耐疲労性および引張強さが共に低下するので好ましくない。 Examples of the amine anti-aging agent blended in the rubber composition constituting the insertion rubber layer in the present invention include, for example, N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine, octylated diphenylamine, thiodiphenylamine, 4 4′-bis (α, α-dimethylbenzyl) diphenylamine, p- (p-toluenesulfonylamido) diphenylamine, N, N′-di-2-naphthyl-p-phenylenediamine, N, N′-diphenyl-p -Phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p- Phenylenediamine and N- (3-methacryloyloxy-2-hydroxylpropyl ) -P-phenylenediamine and the like. The amine-based anti-aging agent is used in an amount that is larger than the usual compounding amount with respect to 100 parts by weight of the rubber component, that is, 3.0 to 10.0 parts by weight, preferably 4.0 to 8.0 parts by weight. Blended in quantity. If the amine type anti-aging agent is less than 3.0 parts by weight, the fatigue resistance is lowered, and if it exceeds 10.0, both the fatigue resistance and the tensile strength are lowered.
本発明における挿入ゴム層を構成するゴム組成物において、更に、硫黄の配合量を通常よりも多めに、即ち、５.０〜１２.０重量部、好ましくは７.０〜１０.０重量部の範囲で配合することにより、所期の引張特性、耐疲労性および耐水接着性をバランス良く向上させることができる。 In the rubber composition constituting the insertion rubber layer in the present invention, the amount of sulfur added is larger than usual, that is, 5.0 to 12.0 parts by weight, preferably 7.0 to 10.0 parts by weight. By blending in the above range, desired tensile properties, fatigue resistance and water-resistant adhesion can be improved in a well-balanced manner.
本発明における挿入ゴム層を構成するゴム組成物には、上記必須成分に加えて、当該ゴム組成物に一般に配合されている任意の配合剤、例えば、カーボンブラック等の補強剤、充填剤、加硫または架橋剤、加硫または架橋促進剤、各種オイル、軟化剤、可塑剤、有機コバルト塩等の接着助剤などを、必要に応じて通常の配合量の範囲で適宜配合することができる。 In the rubber composition constituting the insertion rubber layer in the present invention, in addition to the above essential components, any compounding agent generally blended in the rubber composition, for example, a reinforcing agent such as carbon black, a filler, an additive, Sulfur or cross-linking agents, vulcanization or cross-linking accelerators, various oils, softeners, plasticizers, adhesion aids such as organic cobalt salts, and the like can be appropriately blended within the range of normal blending amounts as necessary.
本発明における挿入ゴム層は、走行中にスチールコードと接着系コンパウンドとの接着剥離が最も起こり易い、タイヤのカーカス層とＬフィラー層間またはカーカス層とビードフィラー間、あるいはこれらの両方の部位に配設することが最適である。その際、当該ゴム層の厚さは、０.２〜２.０ｍｍとすることが好ましい。 In the present invention, the insertion rubber layer is disposed in the tire carcass layer and the L filler layer, between the carcass layer and the bead filler, or both of them, where the adhesion and peeling between the steel cord and the adhesive compound are most likely to occur during running. It is optimal to install. In that case, the thickness of the rubber layer is preferably 0.2 to 2.0 mm.
以下、標準例、実施例１〜１３および比較例１〜３によって本発明を更に説明するが、本発明の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。 Hereinafter, although this invention is further demonstrated by a standard example, Examples 1-13, and Comparative Examples 1-3, it cannot be overemphasized that the scope of the present invention is not limited to these Examples.
試験サンプルの調製
加硫促進剤と硫黄を除く配合成分を１.８リットルの密閉型ミキサーで３〜５分間混練し、１６５±５℃の温度に達した時に放出したマスターバッチに加硫促進剤と硫黄を８インチのオープンロールで混練してゴム組成物を得た。次いで、このゴム組成物を１５ｃｍ×１５ｃｍ×０.２ｃｍの金型中において１５０℃で３０分間プレス加硫して、試験サンプル（ゴムシート）を得、以下の試験に供した。
Preparation of test sample Vulcanization accelerator and compounding ingredients excluding sulfur were kneaded for 3 to 5 minutes in a 1.8 liter closed mixer, and vulcanization accelerator was released into the master batch released when the temperature reached 165 ± 5 ° C. And sulfur were kneaded with an 8-inch open roll to obtain a rubber composition. Next, this rubber composition was press vulcanized at 150 ° C. for 30 minutes in a 15 cm × 15 cm × 0.2 cm mold to obtain a test sample (rubber sheet), which was subjected to the following test.
試験方法
１）引張特性：ＪＩＳ Ｋ６２５１に準拠して、Ｍ３００（３００％モジュラス）、ＴB（引張強さ）およびＥB（切断時伸び）を測定した。結果を指数で示した。指数が大である程良好であることを示す。
２）耐疲労性：ＡＳＴＭ Ｄ４３０−５９に準拠して、定歪シート疲労を測定した。結果を指数で示した。指数が大である程良好であることを示す。
３）耐水接着性：表１に示す各種ゴム組成物についてＡＳＴＭ Ｄ２２２９に準拠して、引抜力とゴム被覆率の評価を実施した。温水接着は、７０℃温水中に４週間浸漬後、引抜試験を行った。結果を５段階評価した。大きい程良好な結果を示す。
Test Method 1) Tensile properties: M300 (300% modulus), T B (tensile strength) and E B (elongation at break) were measured according to JIS K6251. The results are shown as an index. It shows that it is so favorable that an index | exponent is large.
2) Fatigue resistance: Constant strain sheet fatigue was measured according to ASTM D430-59. The results are shown as an index. It shows that it is so favorable that an index | exponent is large.
3) Water-resistant adhesiveness: Various rubber compositions shown in Table 1 were evaluated for pulling force and rubber coverage in accordance with ASTM D2229. For hot water adhesion, a pull-out test was performed after immersion in 70 ° C. warm water for 4 weeks. The results were rated on a five-point scale. Larger values indicate better results.
標準例、実施例１〜１３および比較例１〜３
結果を以下の表１に示す。
The results are shown in Table 1 below.
表１の結果によれば、本発明になるゴムシートは、引張特性、耐疲労性および耐水接着性の点で所期の効果を奏していることが判る。 According to the results of Table 1, it can be seen that the rubber sheet according to the present invention has the desired effects in terms of tensile properties, fatigue resistance, and water-resistant adhesion.
以上説明したとおり、本発明によるゴム組成物からなるゴム層をタイヤのカーカス層とＬフィラー層間および／またはカーカス層とビードフィラー間に配設すれば、極めて耐久性の優れた空気入りタイヤを得ることができる。 As described above, when a rubber layer made of the rubber composition according to the present invention is disposed between a carcass layer and an L filler layer of a tire and / or between a carcass layer and a bead filler, an extremely durable pneumatic tire is obtained. be able to.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003380051A JP4405238B2 (en) | 2003-11-10 | 2003-11-10 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003380051A JP4405238B2 (en) | 2003-11-10 | 2003-11-10 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005138786A JP2005138786A (en) | 2005-06-02 |
| JP4405238B2 true JP4405238B2 (en) | 2010-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003380051A Expired - Fee Related JP4405238B2 (en) | 2003-11-10 | 2003-11-10 | Pneumatic tire |
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| JP (1) | JP4405238B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6265832B2 (en) * | 2014-05-22 | 2018-01-24 | 株式会社ブリヂストン | Rubber composition, tire, amine compound and anti-aging agent |
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- 2003-11-10 JP JP2003380051A patent/JP4405238B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JP2005138786A (en) | 2005-06-02 |
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