JP2659733B2 - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JP2659733B2 JP2659733B2 JP63007574A JP757488A JP2659733B2 JP 2659733 B2 JP2659733 B2 JP 2659733B2 JP 63007574 A JP63007574 A JP 63007574A JP 757488 A JP757488 A JP 757488A JP 2659733 B2 JP2659733 B2 JP 2659733B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- tread
- parts
- rubber
- 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.)
- Expired - Lifetime
Links
Classifications
-
- 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
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は、タイヤのトレッド部がトレッド踏面部とト
レッド内層部との二重積層構造(以下「キャップ・ベー
ス構造」と称する)を有する空気入りタイヤに関し、更
に詳しくはかかる構造において、そのグリップ性能と耐
摩耗性とを改善する技術を提供するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to air having a tread portion of a tire having a double laminated structure of a tread tread portion and a tread inner layer portion (hereinafter, referred to as a “cap base structure”). More specifically, the present invention provides a technique for improving grip performance and abrasion resistance in such a structure.
(従来の技術) 一般に自動車用タイヤに要求される性能としては安全
性、経済性、乗心地性等がある。今日、これらの要求特
性を満足する為にトレッド部を機能的に分離した、いわ
ゆるキャップ・ベース構造が大型タイヤのみならず乗用
車用タイヤにも用いられてきている。しかし、自動車の
性能向上や高速道路網の発達に伴い、加速性能やブレー
キ性能に代表されるグリップ性能等に基づく安全性を更
に向上させたタイヤが強く望まれている。(Prior Art) Generally, performances required for automobile tires include safety, economy, ride comfort, and the like. Today, so-called cap-base structures in which tread portions are functionally separated to satisfy these required characteristics have been used not only for large tires but also for passenger car tires. However, with the improvement of automobile performance and the development of the expressway network, there is a strong demand for tires with further improved safety based on grip performance represented by acceleration performance and braking performance.
従来、タイヤトレッド部にキャップ・ベース構造を採
用してタイヤのグリップ性能を高めるためには、キャッ
プトレッド部を構成するゴム組成物に高スチレン含有率
を有するスチレン−ブタジエン共重合体ゴムを含有させ
るか、軟化剤及びカーボンブラックを高充填含有させる
か、又はこれらを組み合わせて含有させてきた。Conventionally, in order to improve the grip performance of a tire by adopting a cap-base structure in a tire tread portion, a rubber composition constituting the cap tread portion contains a styrene-butadiene copolymer rubber having a high styrene content. Or the softening agent and the carbon black are contained at a high filling content or a combination thereof.
(発明が解決しようとする問題点) しかしながら、一般的には高スチレン含有率を有する
スチレン−ブタジエン共重合体は高グリップが得られる
反面、耐摩耗性が著しく劣るという問題があった。(Problems to be Solved by the Invention) However, in general, a styrene-butadiene copolymer having a high styrene content has a problem in that although high grip is obtained, abrasion resistance is remarkably poor.
一方、軟化剤及びカーボンブラックの高充填配合系に
おいては、配合加硫ゴムの強力が低下し、ひいては耐摩
耗性が低下するという欠点がある。On the other hand, in a highly filled compounding system of a softener and carbon black, there is a disadvantage that the strength of the compounded vulcanized rubber is reduced, and the abrasion resistance is reduced.
そこで本発明の目的は、低温から比較的高い温度範囲
に亘って高いグリップ性能を有すると共に、耐摩耗性の
低下を伴わないキャップ・ベース構造のトレッドを有す
る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 having a tread having a cap-base structure that has high grip performance from a low temperature to a relatively high temperature range and does not cause a decrease in wear resistance.
(問題点を解決するための手段) 本発明者らは、キャップ・ベース構造を効果的に使用
して空気入りタイヤの低転がり性と高速耐久性とを損う
ことなくタイヤのグリップ性能と耐摩耗性とを改善する
方策について鋭意検討した結果、特有の結合スチレンの
組成分布幅を持つ乳化重合スチレン−ブタジエン共重合
体ゴムをキャップゴムに用い、かつベースゴムの反撥弾
性を所定以上に高めることにより、前記問題点を解決し
うることを確め、本発明を完成するに至った。(Means for Solving the Problems) The present inventors have made effective use of the cap-base structure to improve the grip performance and durability of the pneumatic tire without impairing the low rolling performance and high-speed durability. As a result of intensive studies on measures to improve abrasion properties, it was found that an emulsion-polymerized styrene-butadiene copolymer rubber having a specific bonded styrene composition distribution width was used for the cap rubber, and the rebound resilience of the base rubber was increased to a predetermined level or more As a result, it has been confirmed that the above problems can be solved, and the present invention has been completed.
すなわち本発明は、キャップ・ベース構造を有する空
気入りタイヤにおいて、キャップゴムにゴム成分100重
量部に対して平均結合スチレン含量が20〜70重量%であ
って結合スチレンの組成分布幅が20%以上である乳化重
合スチレン−ブタジエン共重合体ゴムを少なくとも15重
量部以上含有するゴム組成物を配置し、かつベースゴム
にゴム成分100重量部に対してポリイソプレンゴムを少
なくとも40重量部以上含有し、該ベースゴムの反撥弾性
率が60%以上であることを特徴とする空気入りタイヤに
関するものである。That is, the present invention relates to a pneumatic tire having a cap-base structure, wherein the cap rubber has an average bound styrene content of 20 to 70% by weight and a bound styrene composition distribution width of 20% or more based on 100 parts by weight of a rubber component. An emulsion polymerized styrene-butadiene copolymer rubber is a rubber composition containing at least 15 parts by weight or more, and the base rubber contains at least 40 parts by weight of polyisoprene rubber with respect to 100 parts by weight of a rubber component, The present invention relates to a pneumatic tire, wherein the base rubber has a rebound resilience of 60% or more.
ここで、結合スチレン含量は、1H−NMR法により重量
分率で示したものである。Here, the bound styrene content is indicated by weight fraction by 1 H-NMR method.
また、結合スチレンの組成分布は、シンヤ・テラマチ
の方法(J.Macromol Sci.Chem.A4(8)1785,1970)に
従って、シクロヘキサン/イソオクタン混合溶媒および
ベンゼン/メチルエチルケトンを用いてクロス分別し測
定したものである。The composition distribution of bound styrene was measured by cross-fractionation using a cyclohexane / isooctane mixed solvent and benzene / methyl ethyl ketone according to the method of Shinya Teramachi (J. Macromol Sci. Chem. A4 (8) 1785, 1970). It is.
更に、反撥弾性は、30%における加硫ゴムの反撥弾性
をBS−903−223に規定されたダンロップ式トリプソメー
タにて測定したものである。Further, the rebound resilience is obtained by measuring the rebound resilience of the vulcanized rubber at 30% using a Dunlop-type trypsometer specified in BS-903-223.
本発明において、ポリイソプレンゴムとは天然ゴムま
たは合成ポリイソプレンゴムを表わす。In the present invention, the polyisoprene rubber means a natural rubber or a synthetic polyisoprene rubber.
また、本発明の好適例においては、トレッドキャップ
ゴムがゴム成分100重量部に対してヨウ素吸着量が120mg
/g以上のカーボンブラックを40〜100重量部含有する。In a preferred embodiment of the present invention, the tread cap rubber has an iodine adsorption amount of 120 mg per 100 parts by weight of the rubber component.
/ g or more of 40 to 100 parts by weight of carbon black.
尚、本発明の空気入りタイヤに用いられるトレッドキ
ャップ及びトレッドベースのゴム組成物には、通常のゴ
ム工業で用いられる配合剤である加硫促進剤、加硫剤、
促進助剤、カーボンブラック、シリカ等の無機充填剤、
軟化剤、老化防止剤等を適宜配合することができる。The tread cap and the tread-based rubber composition used in the pneumatic tire of the present invention include a vulcanization accelerator, a vulcanizing agent, which is a compounding agent used in a general rubber industry.
Accelerators, carbon black, inorganic fillers such as silica,
A softener, an antioxidant and the like can be appropriately compounded.
(作 用) 本発明の空気入りタイヤにおいては、安全性と経済性
を両立させるためにトレッドゴムをキャップ・ベース構
造とし、かつキャップゴムはゴム成分100重量部に対し
てその平均結合スチレン含量が20〜70重量%であって結
合スチレンの組成分布幅が20%以上の乳化重合スチレン
−ブタジエン共重合体ゴムを少なくとも15重量部以上含
有していることを要する。ここで、平均結合スチレン含
量を20〜70重量%の範囲内としたのは、20重量%未満で
は充分なグリップ性能が得られず、一方70重量%を越え
ると耐摩耗性が悪化し、またゴムが硬くなり過ぎてグリ
ップ性も悪化することになるからである。また、結合ス
チレンの組成分布幅を20%以上としたのは、20%未満で
はグリップ性と耐摩耗性との両立向上といった効果が得
られなくなるからである。更に、かかるスチレン−ブタ
ジエン共重合体をトレッドキャップゴム100重量部中、1
5重量部以上含有することとしたのは、15重量部未満で
はタイヤのグリップ性と耐摩耗性の向上に対し効果が発
揮されないからである。(Operation) In the pneumatic tire of the present invention, in order to achieve both safety and economy, the tread rubber has a cap-base structure, and the cap rubber has an average bound styrene content relative to 100 parts by weight of the rubber component. It must contain at least 15 parts by weight of an emulsion-polymerized styrene-butadiene copolymer rubber having a composition distribution width of 20 to 70% by weight and a bound styrene composition distribution of 20% or more. Here, the reason why the average bound styrene content is set within the range of 20 to 70% by weight is that if the content is less than 20% by weight, sufficient grip performance cannot be obtained, while if it exceeds 70% by weight, the wear resistance deteriorates, This is because the rubber becomes too hard, and the grip properties are also deteriorated. Also, the reason why the composition distribution width of the bound styrene is set to 20% or more is that if it is less than 20%, the effect of improving both the grip performance and the wear resistance cannot be obtained. Further, the styrene-butadiene copolymer was added to 100 parts by weight of a tread cap rubber,
The reason for the content being 5 parts by weight or more is that if the content is less than 15 parts by weight, no effect is exerted on the improvement of the grip properties and wear resistance of the tire.
また本発明においては、トレッドベースゴムはゴム成
分100重量部に対してポリイソプレンゴムを少なくとも4
0重量部以上含有し該トレッドベースゴムの反撥弾性率
が60%以上であることを要する。In the present invention, the tread base rubber contains at least 4 parts of polyisoprene rubber per 100 parts by weight of the rubber component.
It must be contained in an amount of 0 parts by weight or more and the rebound resilience of the tread base rubber must be 60% or more.
ここでポリイソプレンの含有量を40重量部以上とした
のは、40重量部未満では高速耐久性と低転がり抵抗性の
両立が難しいからである。また反撥弾性率が60%以上と
したのは60%未満ではタイヤとしてのロスが大きく、転
がり抵抗が大で経済性の上で問題があるからである。The reason why the content of polyisoprene is set to 40 parts by weight or more is that if it is less than 40 parts by weight, it is difficult to achieve both high-speed durability and low rolling resistance. Further, the rebound resilience is set to 60% or more because if it is less than 60%, the loss as a tire is large, the rolling resistance is large, and there is a problem in economy.
更に本発明の好適例においては、トレッドキャップゴ
ムに、ゴム成分100重量部に対してヨウ素吸着量が120mg
/g以上のカーボンブラックを40〜100重量部含有するこ
とでグリップ性及び耐摩耗性を更に向上することができ
るが、この含有量が40重量部未満ではかかる効果が小さ
く、一方100重量部を越えると混練・作業性が悪化しか
つ耐摩耗性や引張り強度も低下するため好ましくない。Further, in a preferred embodiment of the present invention, the tread cap rubber, the amount of iodine adsorption is 120 mg per 100 parts by weight of the rubber component.
By containing 40 to 100 parts by weight of carbon black of not less than 40 parts by weight, the effect is small when the content is less than 40 parts by weight. If it exceeds, kneading and workability deteriorate, and wear resistance and tensile strength also decrease.
以上の構成要件を満足するトレッドキャップ・ベース
構造の本発明のタイヤであれば、いづれのタイヤ種にお
いても好適で実施することができるが、特にトラック・
バス用、建設用の重車両用タイヤ、二輪車用タイヤ、レ
ース用タイヤや乗用車用ラジアルタイヤにおいてより有
利に実施することができる。The tire of the present invention having a tread cap / base structure satisfying the above-mentioned constitutional requirements can be suitably applied to any type of tire, and is particularly suitable for trucks and trucks.
The present invention can be implemented more advantageously in bus tires, construction tires for heavy vehicles, tires for motorcycles, race tires, and radial tires for passenger cars.
(実施例) 以下、実施例により本発明を詳細に説明するが実施例
によって本発明が限定されるものではない。(Examples) Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the examples.
下記の第1表に示す各種重合体をトレッドキャップゴ
ム用に準備した。尚、平均結合スチレン含量及び結合ス
チレンの組成分布幅は前記の方法にて求めた。Various polymers shown in Table 1 below were prepared for tread cap rubber. The average bound styrene content and the composition distribution width of the bound styrene were determined by the above-described methods.
次に、上記重合体A〜Fを用いたトレッドキャップゴ
ム、及びトレッドベースゴムのゴム組成物を下記の第2
表に示す組成内容(重量部)により調製した。 Next, a rubber composition of a tread cap rubber and a tread base rubber using the above-mentioned polymers A to F was prepared in the following second composition.
It was prepared according to the composition (parts by weight) shown in the table.
タイヤサイズ165SR13のタイヤのトレッドとして、上
記キャップゴムとベースゴムとを組み合わせて9種のタ
イヤを試作し、これらタイヤにつき、耐摩耗性、グリッ
プ性能(ウエットグリップ及びドライグリップの性能)
及び転がり抵抗性を評価した。これら評価方法は下記の
通りである。 Nine types of tires were trial-produced by combining the above cap rubber and base rubber as treads for tires with a tire size of 165SR13. Wear resistance and grip performance (wet grip and dry grip performance) for these tires
And rolling resistance was evaluated. These evaluation methods are as follows.
耐摩耗性 実車にて一般道路を40,000km走行した後の残溝より、
耐摩耗性として摩耗1mm当りの走行距離を算出し、下記
の第3表に示す比較例6のタイヤの値を100として指数
表示した。数値の大きい程良好である。Wear resistance From the remaining groove after traveling 40,000 km on a general road with a real car,
The running distance per 1 mm of wear was calculated as abrasion resistance, and the index was expressed as an index with the value of the tire of Comparative Example 6 shown in Table 3 below as 100. The higher the value, the better.
グリップ性能 ウエット:濡れたアスファルト路面において速度40km/
h、70km/hおよび100km/hの各速度から急制動を与え、完
全に停止するまでの走行距離を求め、その値を比較例6
のタイヤを100として指数表示した。数値の大きい程良
好である。Grip performance Wet: Speed 40km / on wet asphalt
h, 70km / h and 100km / h, and apply braking suddenly to determine the mileage to complete stop.
The tires were indexed as 100. The higher the value, the better.
ドライ:晴れた日に直線路、カーブ、バンク等より成る
周回路走行ラップタイムを測定し、比較例6のタイヤの
タイムを100として指数表示した。数値の大きい程良好
である。Dry: On a sunny day, a lap time of a circuit running on a straight road, a curve, a bank, and the like was measured, and the time of the tire of Comparative Example 6 was set to 100 and displayed as an index. The higher the value, the better.
転がり抵抗性 惰行法にて評価した。測定条件はタイヤ内圧1.7kg/cm
2、荷重JIS100%荷重、惰行開始速度100km/hで、比較例
6のタイヤを100として指数表示した。値が大なる程良
好である。Rolling resistance was evaluated by the coasting method. Measurement conditions are 1.7kg / cm of tire internal pressure.
2 , the load was JIS 100% load, the coasting start speed was 100 km / h, and the tire of Comparative Example 6 was indicated as 100 and the index was indicated. The higher the value, the better.
得られた結果を第3表に示す。 Table 3 shows the obtained results.
(発明の効果) 第3表からも明らかなように、本発明の空気入りタイ
ヤは転がり抵抗性と高速耐久性を損わずにグリップ性能
と耐摩耗性が同時に改善されるという効果が得られる。 (Effects of the Invention) As is clear from Table 3, the pneumatic tire of the present invention has an effect that grip performance and wear resistance are simultaneously improved without impairing rolling resistance and high-speed durability. .
Claims (2)
レッド内層部との二重積層構造を有する空気入りタイヤ
において、トレッド踏面部にゴム成分100重量部に対し
て平均結合スチレン含量が20〜70重量%であって結合ス
チレンの組成分布幅が20%以上である乳化重合スチレン
−ブタジエン共重合体ゴムを少なくとも15重量部以上含
有するゴム組成物を配置し、かつトレッド内層部にゴム
成分100重量部に対してポリイソプレンゴムを少なくと
も40重量部以上含有し、該トレッド内層部の反撥弾性率
が60%以上であることを特徴とする空気入りタイヤ。1. A pneumatic tire in which a tread portion of a tire has a double laminated structure of a tread tread portion and a tread inner layer portion, wherein the tread tread portion has an average combined styrene content of 20 to 70 parts by weight based on 100 parts by weight of a rubber component. A rubber composition containing at least 15 parts by weight or more of an emulsion-polymerized styrene-butadiene copolymer rubber having a composition distribution width of bound styrene of 20% or more, and 100 parts by weight of a rubber component in the tread inner layer. A pneumatic tire containing at least 40 parts by weight or more of a polyisoprene rubber per part, and a rebound resilience of the tread inner layer part is 60% or more.
物がゴム成分100重量部に対してヨウ素吸着量が120mg/g
以上のカーボンブラックを40〜100重量部含有すること
を特徴とする特許請求の範囲第1項記載の空気入りタイ
ヤ。2. The rubber composition disposed on a tread tread portion has an iodine adsorption amount of 120 mg / g with respect to 100 parts by weight of a rubber component.
The pneumatic tire according to claim 1, wherein the pneumatic tire contains 40 to 100 parts by weight of the carbon black.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63007574A JP2659733B2 (en) | 1988-01-19 | 1988-01-19 | Pneumatic tire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63007574A JP2659733B2 (en) | 1988-01-19 | 1988-01-19 | Pneumatic tire |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01186403A JPH01186403A (en) | 1989-07-25 |
JP2659733B2 true JP2659733B2 (en) | 1997-09-30 |
Family
ID=11669580
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63007574A Expired - Lifetime JP2659733B2 (en) | 1988-01-19 | 1988-01-19 | Pneumatic tire |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2659733B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5465990B2 (en) * | 2009-11-25 | 2014-04-09 | 株式会社ブリヂストン | Heavy duty pneumatic radial tire |
-
1988
- 1988-01-19 JP JP63007574A patent/JP2659733B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH01186403A (en) | 1989-07-25 |
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