JPH01314605A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH01314605A JPH01314605A JP63145418A JP14541888A JPH01314605A JP H01314605 A JPH01314605 A JP H01314605A JP 63145418 A JP63145418 A JP 63145418A JP 14541888 A JP14541888 A JP 14541888A JP H01314605 A JPH01314605 A JP H01314605A
- Authority
- JP
- Japan
- Prior art keywords
- styrene
- rubber composition
- pneumatic tire
- hardness
- season
- 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
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229920001971 elastomer Polymers 0.000 claims abstract description 22
- 239000005060 rubber Substances 0.000 claims abstract description 22
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 12
- 230000008961 swelling Effects 0.000 claims abstract description 10
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 4
- 238000004073 vulcanization Methods 0.000 claims description 5
- 230000000717 retained effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 6
- 239000002174 Styrene-butadiene Substances 0.000 description 5
- 244000043261 Hevea brasiliensis Species 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 229920003052 natural elastomer Polymers 0.000 description 4
- 229920001194 natural rubber Polymers 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000005062 Polybutadiene Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 150000003613 toluenes Chemical class 0.000 description 1
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、走行によるトレンド部の硬さ増を抑制して耐
チッピング性を改良した空気入りタイヤに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pneumatic tire with improved chipping resistance by suppressing an increase in hardness of a trend portion due to running.
近年、メンテナンスフリーの傾向−からオールシーズン
タイヤの要求が強い。オールシーズンタイヤとしては、
夏性能と冬性能とをバランスさせ、かつ耐摩耗性のよい
タイヤが要求される。In recent years, there has been a strong demand for all-season tires due to the trend toward maintenance-free tires. As an all-season tire,
Tires that balance summer performance and winter performance and have good wear resistance are required.
従来、オールシーズンタイヤでは、ガラス転移点（Ｔｇ
）の低いスチレン−ブタジエン共重合体ゴム（ＳＢＲ）
に天然ゴム（ＮＲ） 、ポリブタジェンゴム（ＢＲ）等
を配合して冬性能を高めると共にカーボンブランクを多
く配合して耐摩耗性を向上させたコンパウンド（ゴム組
成物）をトレッド部に用いていた。しかし、この場合、
悪路走行によりトレッド部が疲労し易く、このためチッ
ピング（ブロック欠け）といわれる故障がトレッド部に
生じ易い欠点がある。Conventionally, all-season tires have a glass transition point (Tg
) Low styrene-butadiene copolymer rubber (SBR)
A compound (rubber composition) is used in the tread part, which is blended with natural rubber (NR), polybutadiene rubber (BR), etc. to improve winter performance, and contains a large amount of carbon blank to improve wear resistance. Ta. But in this case,
The tread tends to become fatigued due to driving on rough roads, and as a result, a problem called chipping (block chipping) tends to occur in the tread.
また、ＳＢＲを単独で用いたコンパウンドをトレッド部
に使用することもあるが、この場合、トレッド部が硬く
なりすぎるのでコンパウンドに配合するオイルの増量に
より硬さ減をはかることが必要である。しかし、オイル
を増量してもタイヤの使用中にオイル分がトレンド部か
ら他のパーツへ移行し、結果として硬さ増を招き、冬性
能が低下する欠点がある。特に、オールシーズンタイヤ
では冬性能を考慮してトレッド表面に深溝又は広幅溝を
有しており、また、好ましくはブロックが単独で存在す
るため、走行中に該ブロックは変形し易く、疲労も受り
易いので、トレッド部が硬いとブロック欠けが生じてし
まう。Also, a compound using SBR alone may be used in the tread, but in this case, the tread becomes too hard, so it is necessary to reduce the hardness by increasing the amount of oil added to the compound. However, even if the amount of oil is increased, the oil transfers from the trend part to other parts while the tire is in use, resulting in increased hardness and reduced winter performance. In particular, all-season tires have deep or wide grooves on the tread surface in consideration of winter performance, and since the block is preferably present alone, the block is easily deformed during driving and is susceptible to fatigue. If the tread portion is hard, blocks may chip.
本発明は、トレッド部に特定のゴム組成物を用いること
により耐チッピング性を改良した空気入りタイヤを提供
することを目的とする。このタイヤは、オールシーズン
タイヤ、特にオールシーズンラジアルタイヤとして好適
である。An object of the present invention is to provide a pneumatic tire with improved chipping resistance by using a specific rubber composition in the tread portion. This tire is suitable as an all-season tire, especially an all-season radial tire.
このため、本発明は、ビニル結合量が１５〜４５％で結
合スチレン量が５〜２０％のスチレン−ブタジエン共重
合体ゴム２０重量部以上を含有し、加硫後の硬度ＪＩＳ
Ｉｔｓが一１０℃で７０以下であり、トルエン膨潤度
が２１５％以上のゴム組成物をトレッド部に用いたこと
を特徴とする空気入りタイヤを要旨とする。For this reason, the present invention contains 20 parts by weight or more of a styrene-butadiene copolymer rubber having a vinyl bond content of 15 to 45% and a bonded styrene content of 5 to 20%, and has a hardness of JIS after vulcanization.
The gist of the present invention is a pneumatic tire characterized by using a rubber composition in the tread portion, whose ITS is 70 or less at 110° C. and whose toluene swelling degree is 215% or more.
以下、本発明の構成につき詳しく説明する。Hereinafter, the configuration of the present invention will be explained in detail.
本発明では、下記の要件（１）〜（３）からなるゴム組
成物をトレンド部に使用する。すなわぢ、トレンド部を
該ゴム組成物で構成するのである。In the present invention, a rubber composition that meets the following requirements (1) to (3) is used for the trend part. In other words, the trend portion is made of the rubber composition.
（１）ビニル結合量が１５〜４５％で結合スチレン量が
５〜２０％のスチレン−ブタジエン共重合体ゴム（Ｓ
Ｂ Ｒ）を２０重量部以上含有すること。(1) Styrene-butadiene copolymer rubber (S
Contain 20 parts by weight or more of B R).
ビニル結合量が１５％未満ではウェット性能が低下し、
４５％超では耐摩耗性が低下する。If the vinyl bond amount is less than 15%, wet performance will decrease,
If it exceeds 45%, wear resistance decreases.
また、結合スチレン量が５％未満ではウェット性能が低
下し、２０％超では硬さが高くなり、冬性能で不利とな
る。Furthermore, if the amount of bound styrene is less than 5%, the wet performance will decrease, and if it exceeds 20%, the hardness will increase, which will be disadvantageous in winter performance.
このＳＢＲば、スチレン連鎖分布がＳｌ＋３２≧９０％
であることが好ましい。ここでＳ、とは全結合スチレン
量に対する単離スチレンの比率をいい、Ｓ２とは全結合
スチレン量に対するスチレンが２個連なったものの比率
をいう。In this SBR, the styrene chain distribution is Sl+32≧90%
It is preferable that Here, S refers to the ratio of isolated styrene to the total amount of bonded styrene, and S2 refers to the ratio of two styrene molecules connected to the total amount of bonded styrene.
単離スチレンＳ１およびスチレン連鎖Ｓ２は、ブタジェ
ン単位の二重結合を全てオゾン開裂して得られた分解物
の０３分解ゲルバ、−ミエーションクロマトグラフ（Ｇ
、Ｐ、Ｃ）法によって分析した値である （［ポリマＪ
（Ｐｏｌｙｍｅｒ）第２２巻１７２１頁または高分子
学会予稿集、第２９巻、第９号、２０５５頁）。Isolated styrene S1 and styrene chain S2 were analyzed using a decomposition product 03 decomposed Gelba-meation chromatograph (G
, P, C) method ([Polymer J
(Polymer) Vol. 22, p. 1721 or Proceedings of the Society of Polymer Science, Vol. 29, No. 9, p. 2055).
なお、送液ポンプとしてトライローフ■型（日本分光社
製）、カラムとしてファインバックゲル１０１φ７．５
ｘ５００（日本分光社製）、検出器としてＵＶ２５４
ｎｍをそれぞれ、使用した。In addition, Triloaf ■ type (manufactured by JASCO Corporation) was used as the liquid pump, and Fineback Gel 101φ7.5 was used as the column.
x500 (manufactured by JASCO Corporation), UV254 as a detector
nm was used, respectively.
ＳＢＲの含有量は、２０重量部以上、好ましくは２５重
量部〜７０重量部である。２０重量部未満では冬性能と
耐摩耗性のバランスを維持することができなくなってし
まう。The content of SBR is 20 parts by weight or more, preferably 25 parts by weight to 70 parts by weight. If it is less than 20 parts by weight, it will not be possible to maintain the balance between winter performance and wear resistance.
ＳＢＲ以外に他のゴムを含有してもよいが、天然ゴム（
ＮＲ）、ポリブタジェンゴム（ＢＲ）は含有されるとチ
ッピングが生ずる傾向があるので不適である。Other rubbers may be contained in addition to SBR, but natural rubber (
NR) and polybutadiene rubber (BR) are unsuitable because they tend to cause chipping.
（２）硬化後の硬度ＪＩＳ Ｈｓが一１０℃で７０以下
であること。(2) Hardness JIS Hs after curing is 70 or less at -10°C.
７０超の場合には、冬性能、すなわち具体的には氷結路
制動性能、雪上路側動性能などを維持できないからであ
る。This is because if it exceeds 70, winter performance, specifically braking performance on icy roads, roadside driving performance on snow, etc., cannot be maintained.
（３）トルエン膨潤度が２１５％以上であること。(3) The degree of toluene swelling is 215% or more.
トルエン膨潤度とは、室温にてトルエン中に７２時間浸
漬した後の体積変化率〔膨潤度−浸漬後の体積／もとの
体積〕をいう。トルエン膨潤度が２１５％未満では耐チ
ッピング性を改良することが困難である。The degree of toluene swelling refers to the rate of change in volume after being immersed in toluene for 72 hours at room temperature [degree of swelling - volume after immersion/original volume]. If the degree of toluene swelling is less than 215%, it is difficult to improve chipping resistance.
このトルエン膨潤度は２１５％以上であって、２２０％
〜３００％であることが好ましい。This toluene swelling degree is 215% or more, and 220%
It is preferable that it is 300%.
本発明で用いる上述のゴム組成物は、カーボンブラック
、硫黄等の加硫剤、加硫促進剤、加硫促進助剤、老化防
止剤、粘着付与剤、軟化剤、充填剤等を含有してもよい
。カーホンブラックの含有割合は、８０重量部未満であ
るとよい。８０重量部以上の場合には、トレッド部に疲
労が生じ易くなるからである。The above-mentioned rubber composition used in the present invention contains a vulcanizing agent such as carbon black and sulfur, a vulcanization accelerator, a vulcanization accelerating aid, an anti-aging agent, a tackifier, a softener, a filler, etc. Good too. The content of carphone black is preferably less than 80 parts by weight. This is because if the amount is 80 parts by weight or more, fatigue tends to occur in the tread portion.
以下に実施例および比較例を示す。Examples and comparative examples are shown below.
実施例、比較例
表２に示す配合割合（重量部）で各ゴム組成物を作製し
く実施例１〜３、比較例１〜２）、それぞれにつき１６
０℃×１５分加硫後の硬度ＪＩＳＩｓ、ピコ摩耗（μβ
）、ウェットスキッド抵抗、反ばつ弾性率（％）、Ｉ・
ルエン膨潤度（％）を評価した。この結果を表２に示す
。なお、ここで用いたスチレン−ブタジエン共重合体コ
ム（ＳＢＲ−Ｌ ５ＢＲ−２）を表１に示す。Examples and Comparative Examples Each rubber composition was prepared using the compounding ratios (parts by weight) shown in Table 2. Examples 1 to 3 and Comparative Examples 1 to 2)
Hardness JISIs after 15 minutes of vulcanization at 0℃, Pico wear (μβ
), wet skid resistance, recoil modulus (%), I・
The degree of luene swelling (%) was evaluated. The results are shown in Table 2. Note that Table 1 shows the styrene-butadiene copolymer comb (SBR-L 5BR-2) used here.
ＡＳＴＭ Ｄ ２２２８による。値の小さい方がよい。According to ASTM D2228. The smaller the value, the better.
ウェットスキット抵抗の評価方法：
ブリテソシュホータプルスキソトテスターを使用し、２
５℃の雰囲気で、住人スリーエム社製セーフティーウオ
ークを路面とし、湿潤させて測定した。この値が大きい
程つェノトスキノＦ性は良好である。Wet skit resistance evaluation method: Using Brite Soshhota Prski Soto Tester,
Measurements were made in an atmosphere of 5°C using a road surface made of 3M Safety Walk, which was moistened. The larger this value is, the better the Enotoskino F properties are.
夏性能の評価に相当する。値の大きい方がよい。This corresponds to summer performance evaluation. Higher values are better.
反ばつ弾性率の評価方法： ＪＩＳ Ｋ ６３０１による。Evaluation method of recoil modulus: According to JIS K 6301.
低燃費性の評価に相当する。値が大きい方がよい。値が
大きいと発熱が低く、低燃費性が高い。This corresponds to the evaluation of fuel efficiency. Larger values are better. The higher the value, the lower the heat generation and the higher the fuel efficiency.
（本頁以下余白）
表 ２
出
求Ｉ Ｎｊｐｏｌ １１１２日本ゼオン鑞＊ ２
Ｎ１ｐｏｌ １２２ＯＢ本ゼ、！−７Ｇｍ表２から明ら
かなように、本発明で用いるゴム組成物（実施例１〜３
）は、他のゴム組成物（比較例１〜２）に比して全ての
物性において優れていることが判る。(Margins below this page) Table 2 Ikyu I Njpol 1112 Nippon Zeon *2
N1pol 122OB Honze! -7Gm As is clear from Table 2, the rubber compositions used in the present invention (Examples 1 to 3)
) was found to be superior in all physical properties to other rubber compositions (Comparative Examples 1 and 2).
つぎに、これらのゴム組成物をキャンプトレッドゴムと
して用いてタイヤを作製しくタイヤサイズＰ１９５／７
５１７１４、トレッド表面の溝面積比率３３％）、これ
らのタイヤにつき走行後のチッピングの発生の有無を確
認した。この結果を表３に示す。Next, tires were manufactured using these rubber compositions as camp tread rubber, and the tire size was P195/7.
51714, tread surface groove area ratio: 33%), and the presence or absence of chipping after running was confirmed for these tires. The results are shown in Table 3.
（本頁以下余白）
巨
表３から判るように、比較例１〜２のものは共に走行に
よる硬さの変化が大きく、したがってオールシーズンタ
イヤとしては不向きである。(Margins below this page) As can be seen from Giant Table 3, the hardness of Comparative Examples 1 and 2 greatly changes due to running, and therefore is unsuitable as an all-season tire.
また、比較例２のものは、チッピングが発生ずる。Furthermore, in Comparative Example 2, chipping occurred.
以上説明したように本発明によれば、耐チッピング性に
優れ、走行による硬度変化が小さいためオールシーズン
性をより長く保持することができ、充分な劣性能を有し
、反ばつ弾性が高くて発熱し難いため耐摩耗性も満足で
きる空気入りタイヤを提供することが可能となる。As explained above, according to the present invention, the chipping resistance is excellent, the change in hardness due to running is small, so all-season properties can be maintained for a longer period of time, and the present invention has sufficient inferior performance and has high anti-chip resilience. It is possible to provide a pneumatic tire that is less likely to generate heat and has satisfactory wear resistance.
代理人 弁理士 小 川 信 −Agent: Patent Attorney Nobuo Kogawa -
Claims (1)
０％のスチレン−ブタジエン共重合体ゴム２０重量部以
上を含有し、加硫後の硬度ＪＩＳＨｓが−１０℃で７０
以下であり、トルエン膨潤度が２１５％以上のゴム組成
物をトレッド部に用いたことを特徴とする空気入りタイ
ヤ。Vinyl bond content is 15-45% and bonded styrene content is 5-2
Contains 20 parts by weight or more of 0% styrene-butadiene copolymer rubber, and has a hardness JISHs of 70 at -10°C after vulcanization.
A pneumatic tire characterized in that a rubber composition having a toluene swelling degree of 215% or more is used in the tread portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63145418A JP2707278B2 (en) | 1988-06-13 | 1988-06-13 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63145418A JP2707278B2 (en) | 1988-06-13 | 1988-06-13 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01314605A true JPH01314605A (en) | 1989-12-19 |
| JP2707278B2 JP2707278B2 (en) | 1998-01-28 |
Family
ID=15384792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63145418A Expired - Lifetime JP2707278B2 (en) | 1988-06-13 | 1988-06-13 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2707278B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07195904A (en) * | 1993-12-29 | 1995-08-01 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2002322318A (en) * | 2001-04-25 | 2002-11-08 | Sumitomo Rubber Ind Ltd | Rubber composition for tire tread |
| JP2007153209A (en) * | 2005-12-07 | 2007-06-21 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| WO2018211874A1 (en) * | 2017-05-16 | 2018-11-22 | 横浜ゴム株式会社 | Pneumatic tire |
| JP2019218481A (en) * | 2018-06-20 | 2019-12-26 | 住友ゴム工業株式会社 | Rubber composition and tire |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57207629A (en) * | 1981-06-16 | 1982-12-20 | Yokohama Rubber Co Ltd:The | Rubber composition |
| JPS58402A (en) * | 1981-06-24 | 1983-01-05 | Toyo Tire & Rubber Co Ltd | Tire tread constitution with low rollability |
| JPS60124636A (en) * | 1983-12-12 | 1985-07-03 | Bridgestone Corp | Improved pneumatic tire suitable for use on snowy or frozen road |
| JPS62127329A (en) * | 1985-11-27 | 1987-06-09 | Asahi Chem Ind Co Ltd | Rubber composition for tire tread |
| JPS62169840A (en) * | 1986-01-21 | 1987-07-27 | Bridgestone Corp | Tread rubber composition for tire of construction vehicle |
| JPS6315946A (en) * | 1986-07-07 | 1988-01-23 | 松下電器産業株式会社 | Ultrasonic diagnostic apparatus |
-
1988
- 1988-06-13 JP JP63145418A patent/JP2707278B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57207629A (en) * | 1981-06-16 | 1982-12-20 | Yokohama Rubber Co Ltd:The | Rubber composition |
| JPS58402A (en) * | 1981-06-24 | 1983-01-05 | Toyo Tire & Rubber Co Ltd | Tire tread constitution with low rollability |
| JPS60124636A (en) * | 1983-12-12 | 1985-07-03 | Bridgestone Corp | Improved pneumatic tire suitable for use on snowy or frozen road |
| JPS62127329A (en) * | 1985-11-27 | 1987-06-09 | Asahi Chem Ind Co Ltd | Rubber composition for tire tread |
| JPS62169840A (en) * | 1986-01-21 | 1987-07-27 | Bridgestone Corp | Tread rubber composition for tire of construction vehicle |
| JPS6315946A (en) * | 1986-07-07 | 1988-01-23 | 松下電器産業株式会社 | Ultrasonic diagnostic apparatus |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07195904A (en) * | 1993-12-29 | 1995-08-01 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2002322318A (en) * | 2001-04-25 | 2002-11-08 | Sumitomo Rubber Ind Ltd | Rubber composition for tire tread |
| JP2007153209A (en) * | 2005-12-07 | 2007-06-21 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| WO2018211874A1 (en) * | 2017-05-16 | 2018-11-22 | 横浜ゴム株式会社 | Pneumatic tire |
| US11820172B2 (en) | 2017-05-16 | 2023-11-21 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
| JP2019218481A (en) * | 2018-06-20 | 2019-12-26 | 住友ゴム工業株式会社 | Rubber composition and tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2707278B2 (en) | 1998-01-28 |
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