JPH01242642A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH01242642A JPH01242642A JP63068434A JP6843488A JPH01242642A JP H01242642 A JPH01242642 A JP H01242642A JP 63068434 A JP63068434 A JP 63068434A JP 6843488 A JP6843488 A JP 6843488A JP H01242642 A JPH01242642 A JP H01242642A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- rubber
- parts
- trans
- tread
- 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.)
- Pending
Links
- 229920001971 elastomer Polymers 0.000 claims abstract description 35
- 239000005060 rubber Substances 0.000 claims abstract description 35
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000005066 High trans polybutadiene Substances 0.000 claims abstract description 14
- 239000006229 carbon black Substances 0.000 claims abstract description 13
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical group CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 238000001179 sorption measurement Methods 0.000 claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 claims abstract description 4
- 239000011324 bead Substances 0.000 claims abstract description 4
- 229920003244 diene elastomer Polymers 0.000 claims description 5
- 238000005299 abrasion Methods 0.000 abstract description 8
- 229920003049 isoprene rubber Polymers 0.000 abstract description 7
- KAKZBPTYRLMSJV-UHFFFAOYSA-N butadiene group Chemical group C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 3
- 239000005062 Polybutadiene Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 description 5
- 244000043261 Hevea brasiliensis Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229920003052 natural elastomer Polymers 0.000 description 4
- 229920001194 natural rubber Polymers 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920001967 Metal rubber Polymers 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 102100025342 Voltage-dependent N-type calcium channel subunit alpha-1B Human genes 0.000 description 1
- 101710088658 Voltage-dependent N-type calcium channel subunit alpha-1B Proteins 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- -1 tin halide Chemical class 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、空気入りタイヤ、特に高か酷度において耐
摩耗性にすぐれ、かつ著しく耐偏摩耗性にすぐれるゴム
組成物をタイヤトレッド接地部に使用することによりト
レッド部の前記緒特性を改良した空気入リタイヤに関す
る。Detailed Description of the Invention (Field of Industrial Application) This invention provides a pneumatic tire, in particular, a rubber composition that has excellent wear resistance under high harshness conditions and has excellent uneven wear resistance. The present invention relates to a pneumatic tire whose tread characteristics are improved by using the pneumatic tire in the tread section.
（従来の技術）
トラック・バス用タイヤは、近年のラジアル化に伴って
ｌ１ｉｉ４Ｔ！！！耗性が飛曜的に向上し、ヒートセパ
レーション等の故障も急速に減少してきたので、厳しい
か酷度で使われるよ・）になった。ここでいうか酷度と
はタイヤの使用条件の厳しさの程度であり、これば、荷
重、速度、温度、路面粗さ、運行形態、運行路線の前後
横方向加速度分布などの諸条件に支配され、前記諸条件
の複雑な相互作用を受ける。ゴム質より見た総合的か酷
度の指標として、トレッドの単位溝深さ当りの走行距離
（ＫＰＭ）を用いることが多い。ここで、従来のＫＰＭ
が１１００００ｋ ／ ｔｒｍ以下を高が酷度として、
この条件で使用される空気入りタイヤに適用されるゴム
配合設計手法としては、トレッドゴムにおいて、天然ゴ
ム主体にシスポリブタジェンゴム又はスチレンブタジェ
ンゴムをブレンドしたゴム分を使用したり、粒子径の細
かいカーボンブラックを増量使用したりする方法が一般
に行われている。しかし、この方法は、更に耐摩耗性を
向上させるためにポリブタジェンゴムを増量し、又は粒
子径の細かいカーボンブラックを増量使用した場合、耐
摩耗性は向上するものの、加工性が著（７く低下し７、
耐偏摩耗性が悪くなるという問題を抱える。(Prior art) Truck and bus tires have become increasingly radial in recent years. ! ! Abrasion resistance has improved dramatically, and failures such as heat separation have rapidly decreased, so it is now used in severe and severe conditions. Severity here refers to the degree of severity of the tire usage conditions, which is influenced by various conditions such as load, speed, temperature, road surface roughness, mode of operation, and longitudinal and lateral acceleration distribution of the route in use. and is subject to a complex interaction of the aforementioned conditions. The mileage per unit groove depth (KPM) of the tread is often used as an index of the overall degree of wear and tear in terms of rubber quality. Here, traditional KPM
If it is less than 110,000k/trm, it is considered severe.
Rubber compound design methods applied to pneumatic tires used under these conditions include using a blend of natural rubber with cis-polybutadiene rubber or styrene-butadiene rubber in the tread rubber; A commonly used method is to use an increased amount of fine carbon black. However, with this method, if the amount of polybutadiene rubber or carbon black with a fine particle size is increased to further improve wear resistance, although the wear resistance improves, the processability becomes significant (7 7,
It has the problem of poor uneven wear resistance.
一方、特公昭５２−４８９１０号、特開昭５４−８８９
８６号及び特開昭５６−１１８４０３号各公報に上り、
ポリブタジェンゴムとしてトランス含量７０％以上のも
のを使用すると加工性が向Ｊ−０することが知られてい
る。On the other hand, Japanese Patent Publication No. 52-48910, Japanese Patent Publication No. 54-889
No. 86 and Japanese Unexamined Patent Publication No. 56-118403,
It is known that when a polybutadiene rubber with a trans content of 70% or more is used, processability improves by J-0.
更に、特開昭６１−１４３４５３号公報には、トランス
結合金量が７０％以」二のポリブタジェンゴムと天然ゴ
ム等とから成るブレンドゴム１００重量部に窒素吸着比
表面積（１’ｈＳＡ）が１０５へ□１２５ ｍ２／ｇの
特定のカーボンブラックを４０〜７０重量部配合するこ
とにより耐摩耗性等が改良されると述べられている。し
かし、この方法によって、耐摩耗性は、改良されるが未
だ不十分であり、更に耐偏摩耗性が劣るという問題が生
じる。Furthermore, JP-A No. 61-143453 discloses that 100 parts by weight of a blend rubber consisting of polybutadiene rubber containing 70% or more of trans binding metal and natural rubber, etc., is given a nitrogen adsorption specific surface area (1'hSA). It is stated that abrasion resistance etc. can be improved by blending 40 to 70 parts by weight of a specific carbon black of 125 m2/g to 105. However, although the abrasion resistance is improved by this method, it is still insufficient, and furthermore, there arises a problem that the uneven abrasion resistance is inferior.
（発明が解決しようとする課題）
トランスポリブタジェンの加工性改良効果を利用して空
気入りタイヤの耐摩耗性の改良を、加工性の低下、耐偏
摩耗性の悪化などの不利益点を伴うことなく実現するこ
とがこの発明の解決しようとする課題である。(Problem to be solved by the invention) It is possible to improve the wear resistance of pneumatic tires by utilizing the workability improving effect of transpolybutadiene, while eliminating disadvantages such as decreased workability and deterioration of uneven wear resistance. The problem to be solved by the present invention is to achieve this without any additional problems.
（課題を解決するための手段）
本発明者らは、上記課題を解決するため種々検討した結
累、トランス１．４結合単位を特定の割合で含有する高
トランスポリブタジェンゴムと特定の窒素吸着比表面積
を有するカーボンブラックとを組み合わせたゴム組成物
が意外にも有効であることを見いだし、この発明を完成
するに至った。(Means for Solving the Problems) In order to solve the above problems, the present inventors have made various studies and found that a high trans polybutadiene rubber containing a specific proportion of trans 1.4 bond units and a specific nitrogen It was discovered that a rubber composition in combination with carbon black having a specific adsorption surface area was surprisingly effective, and this invention was completed.
すなわち、この発明の第一発明は、トレッド部、サイド
ウオール部及びビード部を備える空気入りタイヤにおい
て、前記トレッド部の接地部を構成するゴム組成物とし
て、イソプレン単位を７０重量％以上含有するイソプレ
ン系ゴム２５〜７５重量部と、トランス−１，４結合単
位を７５〜９０重里％の範囲内で含有する高トランスポ
リブタジェンゴム７５〜２５重量部とより成るゴム分１
００重量部に対し、窒素吸着比表面積（ＮｚＳＡ）が１
３０ ｍ”／ｇ以上で、かつ圧縮ＤＢＰ吸油量（２４Ｍ
４ＤＢＰ）が８０ｃｙ＋ｊ／１００ｇ以上であるカーボ
ンブランク４０重量部以上を配合して成るゴム組成物を
用いた空気入りタイヤである。That is, the first invention of the present invention provides a pneumatic tire having a tread portion, a sidewall portion, and a bead portion, in which a rubber composition constituting the ground contact portion of the tread portion is an isoprene containing 70% by weight or more of isoprene units. Rubber component 1 consisting of 25 to 75 parts by weight of a polyester rubber and 75 to 25 parts by weight of a high trans polybutadiene rubber containing 75 to 90 weight percent of trans-1,4 bonding units.
00 parts by weight, the nitrogen adsorption specific surface area (NzSA) is 1
30 m”/g or more, and compressed DBP oil absorption (24 M
This is a pneumatic tire using a rubber composition containing 40 parts by weight or more of a carbon blank having a carbon blank (4DBP) of 80 cy+j/100 g or more.
更に、この発明の第二の発明は、前記トレッド接地部を
構成するゴム組成物として、イソプレン単位を７０重量
％以上含有するイソプレン系ゴム２５重量部以上７５重
量部未満と、トランス−１，４結合単位を７５〜９０重
量％の範囲内で含有する高トランスポリブタジェンゴム
２５重量部以上７５重量部未満と、これら以外のジエン
系ゴム５０重量部以下とより成るゴム分１００重量部に
対し、前記第一発明に示すカーボンブラックを４０重量
部以上配合して成るゴム組成物を用いた空気入りタイヤ
である。Furthermore, a second aspect of the present invention is that the rubber composition constituting the tread contact portion contains 25 parts by weight or more and less than 75 parts by weight of isoprene rubber containing 70% by weight or more of isoprene units, and trans-1,4. Based on 100 parts by weight of rubber consisting of 25 parts by weight or more and less than 75 parts by weight of high trans polybutadiene rubber containing bonding units in the range of 75 to 90% by weight, and 50 parts by weight or less of diene rubber other than these. , a pneumatic tire using a rubber composition containing 40 parts by weight or more of carbon black according to the first invention.
この発明において、ゴム分全体の中に含まれるビニル結
合ブタジェン単位の合計量がゴム分中に含まれる全ブタ
ジェン単位の１５重量％以下であることが好ましい。In this invention, it is preferable that the total amount of vinyl-bonded butadiene units contained in the entire rubber content is 15% by weight or less of all butadiene units contained in the rubber content.
また、この発明において、高トランスポリブタジェンゴ
ムの１００℃における素ゴムＭ１．１＋４が２５〜５５
であることが好ましい。In addition, in this invention, the base rubber M1.1+4 at 100°C of the high trans polybutadiene rubber is 25 to 55.
It is preferable that
この発明のイソプレン系ゴムは、天然ゴム、イソプレン
ゴム及びイソプレン共重合ゴムを含み、天然ゴムが好ま
しい。The isoprene rubber of the present invention includes natural rubber, isoprene rubber, and isoprene copolymer rubber, with natural rubber being preferred.
この発明のこれら以外のジエン系ゴムとしては、シスポ
リブタジェンゴム、スチレンブタジェン共重合ゴムが例
示される。Examples of other diene rubbers of the present invention include cis-polybutadiene rubber and styrene-butadiene copolymer rubber.
（作 用）
この発明においてトランス−１，４結合単位を７５〜９
０重量％の範囲内で含有する高トランスポリブタジェン
ゴム７５−２５重量部をＮ２ＳＡが１３０ ｍ２／ｇ以
上で、かつ２４Ｍ４ＤＢＰが８０ｃ１ｉｌ／１００ｇ以
上であるカーボンブラックを組み合わせて配合したのは
、カーボンブラックの粒子径を前記のように小さ（する
と、−般に加工性が著しく低下するので、ポリブタジェ
ンのトランス含量を７５〜９０％に調整してこのゴムに
伸長結晶性を発現させることにより加工性を改良するた
めであり、更にこれにより伸長結晶化速度も著しく大き
くなる為に耐摩耗性も大いに向上されるからである。更
に、この加工性と耐摩耗性を有利に両立させるためには
、この高トランスポリブタジェンゴムの素ゴムのムーニ
ー粘度札、や。(Function) In this invention, the trans-1,4 bond unit is 75 to 9
75-25 parts by weight of high trans polybutadiene rubber containing within the range of 0% by weight was blended with carbon black having N2SA of 130 m2/g or more and 24M4DBP of 80c1il/100g or more. If the particle size of the black is made small as described above, the processability generally deteriorates significantly, so by adjusting the trans content of the polybutadiene to 75 to 90% and making the rubber develop elongated crystallinity, the processability is improved. This is because this improves the elongation crystallization rate significantly, which greatly improves the wear resistance.Furthermore, in order to advantageously achieve both workability and wear resistance, Mooney viscosity label of this high trans polybutadiene rubber.
（１００°Ｃ）を２５〜５５とすることが好ましい。ム
ーニー粘度２５未満では耐摩耗性の低下が著しくなり、
５５を超すと加工性が低下する。(100°C) is preferably 25 to 55. When the Mooney viscosity is less than 25, the wear resistance decreases significantly,
When it exceeds 55, workability decreases.
高トランスポリブタジェンゴムの製造方法としては、例
えば、触媒系にＢａアルコラード／有機Ａｌ ゛／有
機Ｍｇ系、有機Ｌｉ／Ｂａアルコラード／有機Ａｌ／有
機Ｌｉ塩系又はＢａアルコラード／有機Ｍｇ系などの触
媒を用いて溶液重合させる方法があり、このような触媒
系の場合、得られるトランスポリブタジェンのトランス
結合連鎖が長いので、伸長結晶性が好適に発現する。As a method for producing high trans polybutadiene rubber, for example, the catalyst system may include a Ba alcolade/organic Al/organic Mg system, an organic Li/Ba alcolade/organic Al/organic Li salt system, or a Ba alcolade/organic Mg system. There is a method of solution polymerization using a catalyst, and in the case of such a catalyst system, the resulting trans polybutadiene has a long trans bond chain, and thus elongated crystallinity is suitably expressed.
この発明に用いられる高トランスポリブタジェンゴムの
トランス結合単位が７５重量％未満では伸長結晶性を発
現するのに十分なトランス連鎖長を有しないし、９０重
量％を超えると重合体がゴム状を示さない。トランス結
合単位が８０〜８５重景％で重量ことが好ましい。また
、伸長結晶性を実現する点で、ビニル結合も１５重量％
以下が好ましい。If the trans linkage unit of the high trans polybutadiene rubber used in this invention is less than 75% by weight, it will not have sufficient trans chain length to exhibit elongated crystallinity, and if it exceeds 90% by weight, the polymer will become rubbery. does not indicate. Preferably, the trans-linking unit accounts for 80-85% by weight. In addition, in terms of achieving elongated crystallinity, the vinyl bond is also 15% by weight.
The following are preferred.
前記高トランスポリブタジェン製造触媒系は、リビング
触媒であるので、重合後期に適量のハロゲン化スズなど
を添加することにより、例えば特開昭５８−１６２６０
１号公報記載のように重合体末端を修飾することができ
、これにより重合体中でのミクロカーボン分散性を改良
することができ、耐摩耗性と加工性の両立上いっそう有
利となる。Since the above-mentioned high trans polybutadiene production catalyst system is a living catalyst, by adding an appropriate amount of tin halide etc. in the late stage of polymerization, it is possible to
As described in Japanese Patent Application No. 1, the terminals of the polymer can be modified, thereby improving the dispersibility of microcarbon in the polymer, which is more advantageous in achieving both wear resistance and processability.
この発明において、高トランスポリブタジェンゴム含量
を２５〜７５重量部に限定した理由は、２５重量部未満
では耐摩耗性が悪くなり、７５重量部を超えると加工性
とタイヤトレッドのチッピング性が悪化するからである
。また、イソプレン系ゴムを２５〜７５重量部に限定し
た理由は、２５重量部未満では強力が低くなるためにタ
イヤトレッドのチッピング性に問題が起こるからであり
、７５重量部を超えると耐摩耗性の改善効果が少ないか
らである。In this invention, the reason why the high trans polybutadiene rubber content is limited to 25 to 75 parts by weight is that if it is less than 25 parts by weight, the wear resistance will deteriorate, and if it exceeds 75 parts by weight, the processability and chipping property of the tire tread will deteriorate. This is because it will get worse. In addition, the reason why isoprene rubber is limited to 25 to 75 parts by weight is that if it is less than 25 parts by weight, the tire tread will become less strong and cause problems with the chipping properties of the tire tread, whereas if it exceeds 75 parts by weight, the wear resistance will decrease. This is because the improvement effect is small.
イソプレン系ゴムの含量は、好ましくは４０〜７０重量
部である。The content of isoprene rubber is preferably 40 to 70 parts by weight.
イソプレン系ゴム及び高トランスポリブタジェンゴムに
更にブレンドする他のジエン系ゴム成分としては、シス
ポリブタジェンゴム、スチレンブタジェン共重合ゴムな
どが挙げられ、シスポリブタジェンゴムは転がり抵抗又
はタイヤの発熱を押さえることを目的に、スチレンフ゛
タジエンゴムは濡れた路面での摩擦係数を確保する目的
で用いられる。ただし、この発明においては、高か酷度
における摩耗を確保するため、上記の更にブレンドする
ジエン系ゴム成分の量は５０重量部以下とする必要があ
り、ブタジェン部の全ビニル含量は１５重量％以下が好
ましい。Other diene rubber components that are further blended with isoprene rubber and high trans polybutadiene rubber include cis polybutadiene rubber, styrene butadiene copolymer rubber, etc. Cis polybutadiene rubber improves rolling resistance and tires. Styrene-butadiene rubber is used to ensure a high coefficient of friction on wet road surfaces, with the aim of suppressing heat generation. However, in this invention, in order to ensure wear under high severity conditions, the amount of the diene rubber component further blended above needs to be 50 parts by weight or less, and the total vinyl content of the butadiene part is 15% by weight. The following are preferred.
カーボンブラックの窒素比表面積が１３０ ｍ”／ｇ未
満又は２４Ｍ４ＤＢＰが８０ｃＩＩＹ／１００ｇ未満の
場合、高が酷度での耐摩耗性が確保できず、カーボンブ
ラック量が４０重量部未満では耐摩耗性が不十分である
。If the nitrogen specific surface area of carbon black is less than 130 m"/g or 24M4DBP is less than 80 cIIY/100 g, high wear resistance cannot be ensured, and if the amount of carbon black is less than 40 parts by weight, wear resistance will be poor. Not enough.
この発明において、ＮＺＳ八はＡＳＴＭ Ｄ ３０３７
により、２４Ｍ４ＤＢＰはＡＳＴＭ Ｄ ３４９３によ
り測定される。In this invention, NZS8 is ASTM D 3037
24M4DBP is measured according to ASTM D 3493.
（実施例） 次に、実施例及び比較例によってこの発明を説明する。(Example) Next, the present invention will be explained with reference to Examples and Comparative Examples.
使用した材料を次に示す。The materials used are shown below.
イ、ポリブタジェン（ＢＲ） ：特性を第１表に示す。B. Polybutadiene (BR): Properties are shown in Table 1.
スチレンブタジェンゴム（ＳＢＲ） ；スチレン２３．
５％、ビニル２１％、肚、、、（１００°Ｃ）５２の５
ＢＩＩＩ ＃１５００ 、。Styrene butadiene rubber (SBR); Styrene 23.
5%, vinyl 21%, belly... (100°C) 52 of 5
BIII #1500.
口、カーボンブラック
Ｎｌｌ０；Ｎｚ５Ａ １４３ ｍ”／ｇ、 ２４Ｍ４Ｄ
ＢＰ ９８ｃ＋ｆｌ／１００ｇ −Ｎ２１９；Ｎｚ５Ａ
１１９ ｍｚ／ｇ、２４門４ＤＢＰ ７５ｃｆｆｌ／
１００ｇ 。Mouth, carbon black Nll0; Nz5A 143 m”/g, 24M4D
BP 98c+fl/100g -N219; Nz5A
119 mz/g, 24 gates 4DBP 75cffl/
100g.
これらの材料を用い、第２表に示す配合に従って１４５
°Ｃ×４０分で加硫して試験片を作成した。145 using these materials and according to the formulation shown in Table 2.
A test piece was prepared by vulcanization at °C for 40 minutes.
第２表
ゴム加工性及び加硫ゴム特性の試験は、次の方法によっ
た。Table 2 Rubber processability and vulcanized rubber properties were tested in the following manner.
（１）ゴム加工性
ＪＩＳ Ｋ ６３００に準する。ただし、測定温度は１
３０°Ｃとした。(1) Rubber processability Conforms to JIS K 6300. However, the measured temperature is 1
The temperature was 30°C.
（２）引張り特性 ＪＩＳに６３０１に準する。(2) Tensile properties Conforms to JIS 6301.
（３）レジリエンス
ダンロップ・トリブソメーター（ＢＳ９０３）にて温度
２５°Ｃで測定した。(3) Measured with a Resilience Dunlop Tribusometer (BS903) at a temperature of 25°C.
（４）耐摩耗性
岩本製作所製ＢＳランボーン試験機にて荷重５ｋｇ、サ
ンプル周速１００ｍ／＋ｉｎ、スリップ率７０％におい
て試験を行い、減摩量の逆数を指数化した。(4) Wear resistance A test was conducted using a BS Lambourn testing machine manufactured by Iwamoto Seisakusho at a load of 5 kg, a sample peripheral speed of 100 m/+in, and a slip ratio of 70%, and the reciprocal of the amount of friction reduction was expressed as an index.
値が高い程耐摩耗性がよい。The higher the value, the better the wear resistance.
（５）ウェットスキッド
岩本製作所製スペクトロメーターにてＯｏＣのｔａｎ
δを測定し、指数として表した。値が高い程濡れた路面
でのブレーキ性能がすぐれている。(5) Tan of OoC with wet skid Iwamoto Seisakusho spectrometer
δ was measured and expressed as an index. The higher the value, the better the braking performance on wet roads.
（６）耐偏摩耗性
（４）項で示したランボーン試験片の周上３箇所に全幅
に深さ３ ＋ｎ＋＋＋の傷を入れ、（４）項の条件でテ
ストした場合のサンプルの摩耗状態を外観からランク付
けした。数字が小さい程耐偏摩耗性がよい。(6) Resistance to uneven wear We made scratches with a depth of 3 +n+++ across the entire width at three locations on the circumference of the Lambourn test piece shown in section (4), and examined the wear state of the sample when tested under the conditions of section (4). Ranked based on appearance. The smaller the number, the better the uneven wear resistance.
Ｘ１Ｌ［ＬΣｉ、此較朋１〜９
前記方法に従って作成した試験片の前記試験方法による
試験結果を第３表に示す。X1L [LΣi, this comparison 1 to 9 Table 3 shows the test results of the test pieces prepared according to the above method according to the above test method.
実施例１〜５に示すごとく、トランス−１，４結合７７
％又は８５％の重合体を配合した場合、対照配合（比較
例１）に比べ、耐摩耗性及び耐偏摩耗性が著しく改善さ
れ、その他の物性も良好である。As shown in Examples 1-5, trans-1,4 bond 77
% or 85% of the polymer, the abrasion resistance and uneven abrasion resistance are significantly improved compared to the control formulation (Comparative Example 1), and other physical properties are also good.
これに対し、同じトランスＢＲでもその配合量が２０重
量部以下又は８０重量部以上では、耐摩耗性の改良効果
がなかったり、物性のバランスに欠けたりする。また、
トランス結合７１又は９２％の重合体を配合した場合は
、耐摩耗性の改良効果が見られない。したがって、トラ
ンス結合単位の含量として７５〜９０重量％の範囲、ト
ランスＢＲの配合量として２５〜７５重量部用いること
が前記効果に対して極めて有利な影響を有することが分
かった。On the other hand, if the amount of the same trans BR is less than 20 parts by weight or more than 80 parts by weight, there will be no improvement in wear resistance or the physical properties will be unbalanced. Also,
When a polymer with 71 or 92% trans bonds is blended, no improvement in wear resistance is observed. Therefore, it has been found that using a content of trans bonding units in the range of 75 to 90% by weight and a blending amount of trans BR of 25 to 75 parts by weight has a very advantageous influence on the above-mentioned effects.
（発明の効果）
この発明に従う、トランス−１，４結合量が７５〜９０
重量％のポリブタジェンゴムを２５〜７５重量部配合し
たトレッドを備える空気入りタイヤは、実施例に示すよ
うに製造時の加工性を損なうことなく、高が節度域での
耐摩耗性及び耐偏摩耗性を大幅に改良することができる
。(Effect of the invention) According to this invention, the trans-1,4 bond amount is 75 to 90
A pneumatic tire equipped with a tread containing 25 to 75 parts by weight of polybutadiene rubber has excellent wear resistance and durability in the high moderation range without impairing processability during manufacturing, as shown in the examples. Uneven wear resistance can be significantly improved.
Claims (1)
る空気入りタイヤにおいて、前記トレッド部の接地部を
構成するゴム組成物として、イソプレン単位を７０重量
％以上含有するイソプレン系ゴム２５〜７５重量部と、
トランス−１，４結合単位を７５〜９０重量％の範囲内
で含有する高トランスポリブタジエンゴム７５〜２５重
量部とより成るゴム分１００重量部に対し、窒素吸着比
表面積（Ｎ＿２ＳＡ）が１３０ｍ＾２／ｇ以上で、かつ
圧縮ＤＢＰ吸油量（２４Ｍ４ＤＢＰ）が８０ｃｍ＾２／
１００ｇ以上であるカーボンブラック４０重量部以上を
配合して成るゴム組成物を用いたことを特徴とする空気
入りタイヤ。 ２、トレッド部、サイドウォール部及びビード部を備え
る空気入りタイヤにおいて、前記トレッド部の接地部を
構成するゴム組成物として、イソプレン単位を７０重量
％以上含有するイソプレン系ゴム２５重量部以上７５重
量部未満と、トランス−１，４結合単位を７５〜９０重
量％の範囲内で含有する高トランスポリブタジエンゴム
２５重量部以上７５重量部未満と、これら以外のジエン
系ゴム５０重量部以下とより成るゴム分１００重量部に
対し、窒素吸着比表面積（Ｎ＿２ＳＡ）が１３０ｍ＾２
／ｇ以上で、かつ圧縮ＤＢＰ吸油量（２４Ｍ４ＤＢＰ）
が８０ｃｍ＾２／１００ｇ以上であるカーボンブラック
４０重量部以上を配合して成るゴム組成物を用いたこと
を特徴とする空気入りタイヤ。[Scope of Claims] 1. In a pneumatic tire comprising a tread portion, a sidewall portion, and a bead portion, an isoprene-based rubber containing 70% by weight or more of isoprene units as a rubber composition constituting the ground contact portion of the tread portion. 25 to 75 parts by weight,
Nitrogen adsorption specific surface area (N_2SA) is 130 m^2 for 100 parts by weight of rubber consisting of 75 to 25 parts by weight of high trans polybutadiene rubber containing trans-1,4 bond units in the range of 75 to 90% by weight. /g or more, and compressed DBP oil absorption (24M4DBP) is 80cm^2/
A pneumatic tire characterized by using a rubber composition containing 40 parts by weight or more of carbon black in an amount of 100 g or more. 2. In a pneumatic tire comprising a tread portion, a sidewall portion, and a bead portion, the rubber composition constituting the ground contact portion of the tread portion includes 25 parts by weight or more and 75 parts by weight of isoprene-based rubber containing 70% by weight or more of isoprene units. 25 parts by weight or more and less than 75 parts by weight of high trans polybutadiene rubber containing trans-1,4 bonding units in the range of 75 to 90% by weight, and 50 parts by weight or less of other diene rubbers. Nitrogen adsorption specific surface area (N_2SA) is 130m^2 for 100 parts by weight of rubber content.
/g or more and compressed DBP oil absorption (24M4DBP)
A pneumatic tire characterized by using a rubber composition containing 40 parts by weight or more of carbon black having a carbon black of 80 cm^2/100 g or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63068434A JPH01242642A (en) | 1988-03-23 | 1988-03-23 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63068434A JPH01242642A (en) | 1988-03-23 | 1988-03-23 | Pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01242642A true JPH01242642A (en) | 1989-09-27 |
Family
ID=13373594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63068434A Pending JPH01242642A (en) | 1988-03-23 | 1988-03-23 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01242642A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2647457A1 (en) * | 1989-05-23 | 1990-11-30 | Bridgestone Corp | RUBBER COMPOSITION FOR TIRE TRUCK HAVING IMPROVED WEAR RESISTANCE |
| US5229459A (en) * | 1991-10-17 | 1993-07-20 | The Goodyear Tire & Rubber Company | Rubber stock containing high trans polybutadiene |
| US5386865A (en) * | 1991-10-21 | 1995-02-07 | The Goodyear Tire & Rubber Company | Tire with rubber sidewall |
-
1988
- 1988-03-23 JP JP63068434A patent/JPH01242642A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2647457A1 (en) * | 1989-05-23 | 1990-11-30 | Bridgestone Corp | RUBBER COMPOSITION FOR TIRE TRUCK HAVING IMPROVED WEAR RESISTANCE |
| US5229459A (en) * | 1991-10-17 | 1993-07-20 | The Goodyear Tire & Rubber Company | Rubber stock containing high trans polybutadiene |
| US5386865A (en) * | 1991-10-21 | 1995-02-07 | The Goodyear Tire & Rubber Company | Tire with rubber sidewall |
| US5626697A (en) * | 1991-10-21 | 1997-05-06 | The Goodyear Tire & Rubber Company | Tire with rubber sidewall |
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