JPH0687975A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH0687975A JPH0687975A JP4260527A JP26052792A JPH0687975A JP H0687975 A JPH0687975 A JP H0687975A JP 4260527 A JP4260527 A JP 4260527A JP 26052792 A JP26052792 A JP 26052792A JP H0687975 A JPH0687975 A JP H0687975A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- tire
- syn
- weight
- inner liner
- 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
- 229920001971 elastomer Polymers 0.000 claims abstract description 46
- 239000005060 rubber Substances 0.000 claims abstract description 46
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 229920003049 isoprene rubber Polymers 0.000 claims abstract description 8
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 6
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 6
- 229920001194 natural rubber Polymers 0.000 claims abstract description 6
- 229920002589 poly(vinylethylene) polymer Polymers 0.000 claims abstract 2
- 229920005549 butyl rubber Polymers 0.000 claims description 9
- 229920005555 halobutyl Polymers 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 abstract description 17
- 238000002156 mixing Methods 0.000 abstract description 9
- 238000000465 moulding Methods 0.000 abstract description 7
- 230000000704 physical effect Effects 0.000 abstract description 7
- VHOQXEIFYTTXJU-UHFFFAOYSA-N Isobutylene-isoprene copolymer Chemical group CC(C)=C.CC(=C)C=C VHOQXEIFYTTXJU-UHFFFAOYSA-N 0.000 abstract 2
- 238000000034 method Methods 0.000 description 15
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000013329 compounding Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 229920001195 polyisoprene Polymers 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000004636 vulcanized rubber Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical group N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 101100043731 Caenorhabditis elegans syx-3 gene Proteins 0.000 description 3
- 101100535673 Drosophila melanogaster Syn gene Proteins 0.000 description 3
- 101100368134 Mus musculus Syn1 gene Proteins 0.000 description 3
- SQBBHCOIQXKPHL-UHFFFAOYSA-N tributylalumane Chemical compound CCCC[Al](CCCC)CCCC SQBBHCOIQXKPHL-UHFFFAOYSA-N 0.000 description 3
- VFWCMGCRMGJXDK-UHFFFAOYSA-N 1-chlorobutane Chemical compound CCCCCl VFWCMGCRMGJXDK-UHFFFAOYSA-N 0.000 description 2
- MMEDJBFVJUFIDD-UHFFFAOYSA-N 2-[2-(carboxymethyl)phenyl]acetic acid Chemical compound OC(=O)CC1=CC=CC=C1CC(O)=O MMEDJBFVJUFIDD-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229920006038 crystalline resin Polymers 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 2
- XPUJOEOXHUYRPJ-UHFFFAOYSA-N 2,4-ditert-butyl-4-methylcyclohexa-1,5-dien-1-ol Chemical compound CC(C)(C)C1=C(O)C=CC(C)(C(C)(C)C)C1 XPUJOEOXHUYRPJ-UHFFFAOYSA-N 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 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
- 230000004888 barrier function Effects 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- GAYAMOAYBXKUII-UHFFFAOYSA-L cobalt(2+);dibenzoate Chemical compound [Co+2].[O-]C(=O)C1=CC=CC=C1.[O-]C(=O)C1=CC=CC=C1 GAYAMOAYBXKUII-UHFFFAOYSA-L 0.000 description 1
- NRLCNVYHWRDHTJ-UHFFFAOYSA-L cobalt(2+);naphthalene-1-carboxylate Chemical compound [Co+2].C1=CC=C2C(C(=O)[O-])=CC=CC2=C1.C1=CC=C2C(C(=O)[O-])=CC=CC2=C1 NRLCNVYHWRDHTJ-UHFFFAOYSA-L 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000013101 initial test Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- WNFSFUSCVXIYGN-UHFFFAOYSA-N phenylaluminum Chemical compound [Al]C1=CC=CC=C1 WNFSFUSCVXIYGN-UHFFFAOYSA-N 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 1
- 229960002447 thiram Drugs 0.000 description 1
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
- Tyre Moulding (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、タイヤの成型および加
硫時に起こるコード出を防ぐことにより耐久性を向上さ
せた空気入りタイヤに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire having improved durability by preventing cords from being generated during tire molding and vulcanization.
【０００２】[0002]
【従来の技術】従来より、空気りタイヤのインナーライ
ナーには、タイヤの空気圧を保持する目的で、ガスバリ
ヤー性の高いブチル系ゴム組成物が用いられてきた。し
かし、ブチル系ゴム組成物は、一般にグリーンモジュラ
スが低いため、タイヤの成型および加硫時に、タイヤを
補強する目的で使用されているプライコードがインナー
ライナーに食い込む、いわゆるコード出を起こす欠点を
有していた。かかるコード出が起こると、インナーライ
ナーとコードとの間のゲージが薄くなるため、タイヤの
空気圧を長期間保持できなくなるばかりか、タイヤの転
動時にコード出部分に応力の集中が起こり、タイヤの耐
久性が著しく低下した。2. Description of the Related Art Conventionally, a butyl rubber composition having a high gas barrier property has been used for the inner liner of a pneumatic tire for the purpose of maintaining the air pressure of the tire. However, since the butyl rubber composition generally has a low green modulus, it has a drawback that the ply cord used for the purpose of reinforcing the tire bites into the inner liner, so-called cord ejection, at the time of molding and vulcanizing the tire. Was. When such cord extension occurs, the gauge between the inner liner and the cord becomes thin, so not only can tire pressure not be maintained for a long period of time, but stress also concentrates on the cord extension part when the tire rolls, Durability was significantly reduced.
【０００３】これまでに、このようなコード出を防止す
るために、いくつかの方法が提案されてきた。一つに
は、タイヤ成型時に電子線を照射することにより、予め
インナーライナーを予備架橋する方法がある。また、他
の方法として、特開昭５０−７４６４３号公報や特開平
１−１０９１０４号公報に開示されているように、ゴム
組成物に結晶性樹脂であるシンジオタクチック−１，２
−ポリブタジエン（以下「ｓｙｎ−１，２ＰＢ」と略記
する）を配合し、グリーンモジュラスを高くする方法が
ある。Until now, several methods have been proposed to prevent such code generation. One is a method of pre-crosslinking the inner liner in advance by irradiating with an electron beam during tire molding. As another method, as disclosed in JP-A-50-74643 and JP-A-1-109104, syndiotactic-1,2 which is a crystalline resin in a rubber composition is used.
There is a method of increasing the green modulus by blending polybutadiene (hereinafter abbreviated as “syn-1,2PB”).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来提
案されてきた上述のコード出防止方法は必ずしも満足の
いくものではなかった。すなわち、タイヤ成型時に電子
線を照射する方法は、コード出防止という点では効果は
絶大であるものの、大がかりな設備を必要とし、現実的
ではなかった。However, the above-mentioned code output preventing method that has been proposed hitherto has not always been satisfactory. That is, the method of irradiating an electron beam at the time of tire molding has a great effect in terms of preventing the cord from coming out, but it requires large-scale equipment and is not realistic.
【０００５】また、ゴム組成物に結晶性ｓｙｎ−１，２
ＰＢを配合することによりグリーンモジュラスを高くす
る方法は、コード出防止という点では効果があるもの
の、加硫後にｓｙｎ−１，２ＰＢが結晶として存在する
ため、モジュラス等のゴム物性が温度により急激に変化
するという大きな欠点を有していた。Further, the rubber composition has crystalline syn-1,2.
The method of increasing the green modulus by blending PB is effective in terms of preventing cord generation, but since syn-1,2PB exists as crystals after vulcanization, rubber physical properties such as modulus sharply increase with temperature. It had the major drawback of changing.
【０００６】そこで、本発明の目的は、未加硫ゴムのグ
リーンモジュラスを高くし、タイヤの成型および加硫時
に起こるコード出を防止してタイヤの耐久性を高め、か
つ加硫後のゴム物性の温度依存性を最小限に抑えること
にある。Therefore, an object of the present invention is to increase the green modulus of unvulcanized rubber, prevent cord sticking out at the time of molding and vulcanizing the tire to enhance the durability of the tire, and the physical properties of the rubber after vulcanization. To minimize the temperature dependence of.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記課題
を解決すべく鋭意検討した結果、タイヤのインナーライ
ナー用ゴム組成物として、特定量のイソプレン系ゴムを
ブレンドしたブチル系ゴムに特定の融点を有するｓｙｎ
−１，２ＰＢを特定量配合したゴム組成物を使用するこ
とにより、タイヤの加硫時にｓｙｎ−１，２ＰＢがポリ
イソプレンゴムに完全に相溶するか、あるいは一部相溶
しかつ共加硫して加硫後のｓｙｎ−１，２ＰＢの結晶性
が大幅に低下し、加硫ゴム物性の温度依存性が小さくな
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 inventors have identified a butyl rubber blended with a specific amount of isoprene rubber as a rubber composition for a tire innerliner. Having a melting point of
By using a rubber composition containing -1,2PB in a specified amount, syn-1,2PB is completely compatible with the polyisoprene rubber during tire vulcanization, or is partially compatible with co-vulcanization. Then, the crystallinity of the syn-1,2PB after vulcanization is significantly reduced, the temperature dependence of the physical properties of the vulcanized rubber is reduced, and the above object can be achieved, and the present invention has been completed. .
【０００８】すなわち、本発明の空気入りタイヤは、ブ
チルゴムおよび／またはハロゲン化ブチルゴム３０〜９
０重量％と天然ゴムおよび／またはイソプレンゴム７０
〜１０重量％とからなるゴム分１００重量部に対して、
融点が６０〜１１０℃の範囲内にあるｓｙｎ−１，２Ｐ
Ｂを３〜３０重量部配合したゴム組成物をインナーライ
ナーに用いたことを特徴とするものである。That is, the pneumatic tire of the present invention has a butyl rubber and / or a halogenated butyl rubber 30-9.
0% by weight and natural rubber and / or isoprene rubber 70
With respect to 100 parts by weight of the rubber content consisting of
Syn-1,2P having a melting point in the range of 60 to 110 ° C
A rubber composition containing 3 to 30 parts by weight of B is used as an inner liner.
【０００９】本発明において使用する融点が６０〜１１
０℃の範囲内にあるｓｙｎ−１，２ＰＢの重合触媒とし
て、可溶性コバルト、例えばコバルトオクトエート、コ
バルト１−ナフテート、コバルトベンゾエート等と、有
機アルミニウム化合物、例えばトリメチルアルミニウ
ム、トリエチルアルミニウム、トリブチルアルミニウ
ム、トリフェニルアルミニウム等と、二流化炭素とから
なる触媒系等を挙げることができる。具体的重合方法と
して、特公昭５３−３９９１７号、特公昭５４−５４３
６号および特公昭５６ー１８００５号の各公報記載の方
法を利用することができるが、本発明に使用するｓｙｎ
−１，２ＰＢの重合方法はこれらに記載の方法に特に限
定されるべきものではない。The melting point used in the present invention is 60 to 11.
As a polymerization catalyst for syn-1,2PB within the range of 0 ° C., soluble cobalt such as cobalt octoate, cobalt 1-naphthate, cobalt benzoate and the like, and an organoaluminum compound such as trimethylaluminum, triethylaluminum, tributylaluminum, tributylaluminum and tributylaluminum Examples thereof include a catalyst system composed of phenylaluminum and the like and carbon disulfide. Specific polymerization methods include Japanese Patent Publication No. 53-39917 and Japanese Patent Publication No. 54-543.
The methods described in Japanese Patent Publication No. 6 and Japanese Patent Publication No. 56-18005 can be used, but syn used in the present invention can be used.
The method for polymerizing -1,2PB should not be limited to the methods described therein.
【００１０】本発明に係るゴム組成物の混合方法には特
に制限はなく、溶媒中におけるウェットブレンド法で
も、あるいはバンバリーミキサー等によるドライブレン
ド法でも、同様の効果が得られる。The method of mixing the rubber composition according to the present invention is not particularly limited, and the same effect can be obtained by a wet blending method in a solvent or a dry blending method using a Banbury mixer or the like.
【００１１】なお、本発明に係るゴム組成物には、カー
ボンブラック、シリカ等の無機充填剤、アロマ油、スピ
ンドル油等の軟化剤、老化防止剤、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。The rubber composition according to the present invention includes an inorganic filler such as carbon black and silica, a softening agent such as aroma oil and spindle oil, an antiaging agent, a vulcanizing agent, a vulcanization accelerator, and a vulcanizing agent. It goes without saying that a proper amount of a compounding agent that is usually compounded, such as a accelerating aid, can be appropriately compounded.
【００１２】[0012]
【作用】本発明の空気入りタイヤのインナーライナー用
ゴム組成物は、ゴム成分１００重量部に対して、融点が
６０〜１１０℃の範囲内にあるｓｙｎ−１，２ＰＢを３
〜３０重量部配合することを要する。ｓｙｎ−１，２Ｐ
Ｂの融点範囲をこのような範囲に規定するのは、タイヤ
の加硫温度である１４０〜１８０℃において、ｓｙｎ−
１，２ＰＢがポリイソプレンゴムに完全に相溶するか、
あるいは一部相溶しかつ共加硫するために加硫後のｓｙ
ｎ−１，２ＰＢの結晶性が大幅に低下し、加硫ゴム物性
の温度依存性を低く維持することができるからである。
換言すれば、ｓｙｎ−１，２ＰＢの融点が１１０℃より
高いと、加硫後に存在するｓｙｎ−１，２ＰＢの結晶の
ため、モジュラスの温度依存性が大きくなってしまい、
本発明の目的を達成し得なくなってしまうからである。
一方、ｓｙｎ−１，２ＰＢの融点が６０℃よりも低い
と、未加硫ゴムのグリーンモジュラスの上昇が見られ
ず、コード出に対して十分な防止効果が得られない。The rubber composition for an inner liner of a pneumatic tire of the present invention comprises 3 parts of syn-1,2PB having a melting point of 60 to 110 ° C. with respect to 100 parts by weight of a rubber component.
It is necessary to mix up to 30 parts by weight. syn-1,2P
The melting point range of B is defined in such a range as syn- at the tire vulcanization temperature of 140 to 180 ° C.
1,2PB is completely compatible with polyisoprene rubber,
Or sy after vulcanization to partially solubilize and co-vulcanize
This is because the crystallinity of n-1 and 2PB is significantly reduced, and the temperature dependence of the physical properties of the vulcanized rubber can be kept low.
In other words, if the melting point of syn-1,2PB is higher than 110 ° C., the temperature dependence of the modulus becomes large because of the crystals of syn-1,2PB existing after vulcanization.
This is because the object of the present invention cannot be achieved.
On the other hand, when the melting points of syn-1 and 2PB are lower than 60 ° C., the green modulus of the unvulcanized rubber does not increase, and a sufficient effect of preventing the cord from coming out cannot be obtained.
【００１３】また、ｓｙｎ−１，２ＰＢの配合量を上述
の範囲に規定するのは、この配合量が３重量部よりも少
ないと未加硫ゴムのグリーンモジュラスが相対的に低
く、コード出に対して十分な防止効果が得られず、一方
３０重量部より多いとゴム組成物の耐屈曲疲労性が劣る
ためである。Further, the blending amount of syn-1,2PB is regulated within the above-mentioned range. When the blending amount is less than 3 parts by weight, the green modulus of the unvulcanized rubber is relatively low, and the cord is out. On the other hand, a sufficient preventive effect cannot be obtained, and on the other hand, if it is more than 30 parts by weight, the bending fatigue resistance of the rubber composition is poor.
【００１４】次に、本発明においては上記ゴム成分とし
て、ブチルゴムおよび／またはハロゲン化ブチルゴム３
０〜９０重量％と天然ゴムおよび／またはイソプレンゴ
ム７０〜１０重量％とからなるブレンドゴムを使用する
ことを要する。かかるブレンドゴムにけるブチル系ゴム
の配合割合が３０重量％未満の場合は、インナーライナ
ーの空気透過性が大きくなり、インナーライナー本来の
目的であるタイヤの空気保持の役割を十分に果たさなく
なってしまう。一方、ポリイソプレンゴムの配合割合が
１０重量％未満では、ｓｙｎ−１，２ＰＢと相溶しきれ
ず、加硫後のゴムのモジュラスの温度依存性が大きくな
ってしまう。Next, in the present invention, butyl rubber and / or halogenated butyl rubber 3 is used as the rubber component.
It is necessary to use a blend rubber consisting of 0 to 90% by weight and natural rubber and / or isoprene rubber 70 to 10% by weight. When the blending ratio of the butyl rubber in the blended rubber is less than 30% by weight, the air permeability of the inner liner becomes large, and the original purpose of the inner liner to retain the air in the tire cannot be sufficiently fulfilled. . On the other hand, if the compounding ratio of the polyisoprene rubber is less than 10% by weight, the polyisoprene rubber cannot be completely compatible with syn-1,2PB, and the temperature dependency of the modulus of the rubber after vulcanization becomes large.
【００１５】上述のように、本発明の空気入りタイヤの
インナーライナー用ゴム組成物は、加硫時にｓｙｎ−
１，２ＰＢがポリイソプレンゴムに完全に相溶するか、
あるいは一部相溶しかつ共加硫するために、加硫後のｓ
ｙｎ−１，２ＰＢの結晶性が大幅に低下する。よって、
本発明によると、未加硫ゴムのグリーンモジュラスを高
くし、コード出を効果的に防止することができると同時
に、加硫ゴムのモジュラス等の物性の温度依存性を低く
抑えることができる。As described above, the rubber composition for the inner liner of the pneumatic tire of the present invention is syn-cured at the time of vulcanization.
1,2PB is completely compatible with polyisoprene rubber,
Alternatively, in order to be partially compatible and co-vulcanized, the s
The crystallinity of yn-1,2PB is significantly reduced. Therefore,
According to the present invention, it is possible to increase the green modulus of unvulcanized rubber and effectively prevent cords from being emitted, and at the same time suppress the temperature dependence of physical properties such as modulus of vulcanized rubber.
【００１６】[0016]
【実施例】次に本発明を実施例および比較例により具体
的に説明する。まず、以下のようにして各種ｓｙｎ−
１，２ＰＢ樹脂を調製した。空気を窒素ガスで置換した
容量２リットルのオートクレーブに脱水ベンゼン７６０
ccを入れ、１，３−ブタジエン７４ｇを溶解した。これ
に、コバルトオクトエート１m mol （濃度１m mol ／cc
のベンゼン溶液を使用）を加え、１分後にトリエチルア
ルミニウム２m mol （濃度１m mol ／ccのベンゼン溶
液）を加え、攪拌し、次いで１分後に下記の表１に示す
量のアセトンを添加した。１分後に二硫化炭素０．６m
mol （濃度０．３m mol ／ccのベンゼン溶液）を添加
し、１０℃で６０分間攪拌して、１，３−ブタジエンの
重合を行った。EXAMPLES Next, the present invention will be specifically described with reference to Examples and Comparative Examples. First, various syn-
1,2PB resin was prepared. Dehydrated benzene 760 was placed in an autoclave with a volume of 2 liters in which air was replaced with nitrogen gas.
cc was added and 74 g of 1,3-butadiene was dissolved. Cobalt octoate 1mmol (concentration 1mmol / cc
Was used) and 1 minute later, 2 mmol of triethylaluminum (benzene solution having a concentration of 1 mmol / cc) was added and stirred, and 1 minute later, the amount of acetone shown in Table 1 below was added. 1 minute later carbon disulfide 0.6 m
mol (a benzene solution having a concentration of 0.3 mmol / cc) was added, and the mixture was stirred at 10 ° C. for 60 minutes to polymerize 1,3-butadiene.
【００１７】得られたｓｙｎ−１，２ＰＢ樹脂生成液
に、２，４−ジターシャル−ブチル−ｐ−クレゾール
０．７５ｇを加えた。次いで、メタノール１０００cc中
に、ｓｙｎ−１，２ＰＢ樹脂生成液を加え、ｓｙｎ−
１，２ＰＢ樹脂を析出沈殿させた。このｓｙｎ−１，２
ＰＢを更にメタノールで洗浄し、メタノールをろ過した
後、真空乾燥した。得られたｓｙｎ−１，２ＰＢの融点
を下記の表１に併記する。0.75 g of 2,4-ditertiary-butyl-p-cresol was added to the obtained syn-1,2PB resin production liquid. Next, the syn-1,2PB resin production liquid was added to 1000 cc of methanol to produce syn-
The 1,2PB resin was precipitated. This syn-1,2
PB was further washed with methanol, filtered to remove methanol, and then dried in vacuum. The melting points of the obtained syn-1 and 2PB are also shown in Table 1 below.
【００１８】[0018]
【表１】 [Table 1]
【００１９】上記の各種ｓｙｎ−１，２ＰＢを使用し
て、下記の表２に示す配合処方にてインナーライナー用
のゴム組成物を調製した。なお、表中のゴム成分は合計
で１００重量部となるようにした。A rubber composition for an inner liner was prepared by using the above-mentioned various syn-1,2PB in the formulation shown in Table 2 below. The rubber components in the table were made to be 100 parts by weight in total.
【００２０】[0020]
【表２】 配合剤 重量部 塩化ブチルゴム(Cl-IIR) 変量 天然ゴム（NR） 変量 ｓｙｎ−１，２ＰＢ 変量 カーボンブラック（ＧＰＦ） ６０ スピンドル油 ５ ステアリン酸 ３ ＺｎＯ ３ 加硫促進剤（ＤＭ）1) ０．５ 加硫促進剤（ＴＴ）2) １．５ 硫黄 １．５ １）ジベンゾチアジルジスルフィド ２）テトラメチルチウラムジスルフィド[Table 2] Compounding parts by weight Butyl chloride rubber (Cl-IIR) variable natural rubber (NR) variable syn-1,2PB variable carbon black (GPF) 60 spindle oil 5 stearic acid 3 ZnO 3 vulcanization accelerator (DM) 1 ) 0.5 Vulcanization accelerator (TT) 2) 1.5 Sulfur 1.5 1) Dibenzothiazyl disulfide 2) Tetramethylthiuram disulfide
【００２１】表２に示すゴム組成物を１６５℃×２０分
の条件にて加硫して各種試験片を作成した。また、かか
るゴム組成物をタイヤのインナーライナーに使用し、サ
イズＰＳＲ１６５ＳＲ１３の各種試験タイヤを作成し
て、コード出の評価を行った。本実施例においては、各
種測定を下記の方法に従い行った。The rubber compositions shown in Table 2 were vulcanized at 165 ° C. for 20 minutes to prepare various test pieces. Further, by using such a rubber composition as an inner liner of a tire, various test tires having a size of PSR165SR13 were prepared and evaluated for cords. In this example, various measurements were performed according to the following methods.
【００２２】１）融点 セイコー（株）製の示差熱分析装置（ＤＳＣ２００）を
用いて、窒素流量２０ｍｌ／ｍｉｎで２０℃より１０℃
／ｍｉｎの昇温速度にて測定した。1) Melting point A differential thermal analyzer (DSC200) manufactured by Seiko Co., Ltd. was used, and the flow rate of nitrogen was 20 ml / min.
It was measured at a temperature rising rate of / min.
【００２３】２）空気透過性 厚さ０．５ｍｍの加硫ゴムシートを作成し、（株）東洋
精機製作所製の装置を用いて、２５℃にて空気透過係数
（cc・ｃｍ／ｃｍ2 ・ｓｅｃ・ｃｍＨｇ）を測定した。[0023] 2) Create a vulcanized rubber sheet of air permeable thickness 0.5 mm, (Ltd.) using a Toyo Seiki Seisakusho apparatus, air permeability coefficient at 25 ℃ (cc · cm / cm 2 · sec · cmHg) was measured.
【００２４】３）屈曲疲労による破断率 デマチャック試験を１２０時間行った後、次式により試
験片の破断率（％）を求めた。 破断率（％）＝｛（屈曲疲労後の試験片の破断長さ）／
（初期の試験片の長さ）｝×１００3) Breakage rate due to flexural fatigue After performing a homing test for 120 hours, the breakage rate (%) of the test piece was determined by the following formula. Fracture rate (%) = {(fracture length of test piece after bending fatigue) /
(Length of initial test piece)} × 100
【００２５】４）プライコードとインナーライナーとの
間のゲージ 試験タイヤのトレッド部とサイドウォール部との境界位
置でコード１０本分のゲージを測定し、平均値（ｍｍ）
を求めた。4) Gauge between the ply cord and the inner liner The gauge for 10 cords was measured at the boundary position between the tread portion and the sidewall portion of the test tire, and the average value (mm)
I asked.
【００２６】５）モッジュラスの温度変化率 ＪＩＳ Ｋ６３０１に準じて測定を行い、次式により求
めた。 モッジュラスの温度変化率（％）＝｛（１００℃におけ
る１００％伸長時モジュラス）／（５０℃における１０
０％伸長時モジュラス）｝×１００5) Modulus rate of temperature change Measured according to JIS K6301 and determined by the following formula. Modulus temperature change rate (%) = {(100% elongation modulus at 100 ° C.) / (10 at 50 ° C.
0% elongation modulus)} × 100
【００２７】６）ドラム耐久性 試験タイヤを内圧１．０ｋｇ／ｃｍ2 ，荷重４７０ｋｇ
の条件下、直径約３ｍのドラム上にて１００００ｋｍま
で走行させた。ドラム試験終了後、タイヤ内面の観察を
行い、それぞれ○を異常なし、△をショルダー部に微小
クラック発生、×をショルダー部にコードに沿った亀裂
発生とした。得られた結果を下記の表３に示す。6) Drum durability A test tire was loaded with an internal pressure of 1.0 kg / cm 2 and a load of 470 kg.
Under the above conditions, the drum was run up to 10,000 km on a drum having a diameter of about 3 m. After the completion of the drum test, the inner surface of the tire was observed. In each case, ○ was normal, Δ was a minute crack in the shoulder portion, and × was a crack along the cord in the shoulder portion. The results obtained are shown in Table 3 below.
【００２８】[0028]
【表３】 [Table 3]
【００２９】まず、比較例１〜３および実施例１〜３よ
り以下のことが確かめられた。ｓｙｎ−１，２ＰＢの融
点が６０℃よりも低いとコード出防止に対して効果が認
められず、タイヤの耐久性向上効果が望めない。一方、
融点が１１０℃よりも高いとコード出に対して効果はあ
るもの、モジュラスの温度依存性が大きくなり、なおか
つ屈曲疲労性に劣り、クラックが発生する。また、ｓｙ
ｎ−１，２ＰＢを添加することにより、空気透過係数が
小さくなり、タイヤのインナーライナーとして好適であ
る。First, the following was confirmed from Comparative Examples 1 to 3 and Examples 1 to 3. If the melting points of syn-1 and PB are lower than 60 ° C., no effect can be recognized for preventing cord generation, and the effect of improving tire durability cannot be expected. on the other hand,
If the melting point is higher than 110 ° C., it has an effect on the cord generation, but the temperature dependence of the modulus becomes large, and the bending fatigue resistance is poor, and cracks occur. Also, sy
The addition of n-1 and 2PB reduces the air permeability coefficient and is suitable as an inner liner for tires.
【００３０】次に、実施例４と比較例４からは、イソプ
レン系ゴムが存在しないと、ｓｙｎ−１，２ＰＢ配合ゴ
ムのモジュラスの温度依存性が明らかに大きくなる傾向
にあることが確かめられた。しかも、塩化ブチルゴムが
１００重量部では、コード出防止に対する効果も認めら
れなかった。Next, from Example 4 and Comparative Example 4, it was confirmed that the temperature dependence of the modulus of the rubber compounded with syn-1,2PB tends to obviously increase in the absence of the isoprene rubber. . Moreover, when 100 parts by weight of butyl chloride rubber was used, the effect of preventing the cord from being corded out was not recognized.
【００３１】また、実施例５と比較例５からは、イソプ
レン系ゴムが７０重量部を超えると空気透過性が大きく
なり、インナーライナーとしては不適当であることが確
かめられた。From Example 5 and Comparative Example 5, it was confirmed that when the amount of isoprene rubber exceeds 70 parts by weight, the air permeability becomes large and it is not suitable as an inner liner.
【００３２】さらに、実施例６および７と比較例１、６
および７からは、ゴム成分１００重量部に対するｓｙｎ
−１，２ＰＢの配合部数には最適範囲が存在することが
確かめられた。すなわち、この配合部数が３重量部より
も少ないとコード出防止に対して効果が認められず、一
方３０重量部を超えるとコード出防止に対する効果は大
きくなるものの、モジュラスの温度依存性が大きくな
り、かつ屈曲疲労性にも劣ることとなった。よって、こ
のような場合、クラックが発生してしまうことになる。Further, Examples 6 and 7 and Comparative Examples 1 and 6
From 7 and 7, syn based on 100 parts by weight of the rubber component
It was confirmed that an optimal range exists for the compounding number of -1,2PB. That is, if the compounding amount is less than 3 parts by weight, the effect of preventing cord sticking out is not recognized, while if it exceeds 30 parts by weight, the effect of preventing cord sticking out is large, but the temperature dependence of the modulus becomes large. In addition, the bending fatigue resistance was inferior. Therefore, in such a case, a crack will occur.
【００３３】[0033]
【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、タイヤのインナーライナー用ゴム
組成物として、特定量のイソプレン系ゴムをブレンドし
たブチル系ゴムに特定の融点を有するｓｙｎ−１，２Ｐ
Ｂを特定量配合したゴム組成物を使用したことにより、
タイヤの成型および加硫時に起こるコード出が防止され
タイヤの耐久性が向上し、なおかつ結晶性樹脂を使用し
ているにもかかわらずモジュラス等の加硫後のゴム物性
の温度依存性が最小限に抑えられ、しかも空気透過性も
改善されるという効果が得られる。INDUSTRIAL APPLICABILITY As described above, in the pneumatic tire of the present invention, as the rubber composition for the inner liner of the tire, the butyl rubber blended with a specific amount of isoprene rubber has a specific melting point of syn-. 1,2P
By using a rubber composition containing B in a specific amount,
Cord development that occurs during tire molding and vulcanization is prevented and tire durability is improved, and the temperature dependence of rubber physical properties after vulcanization, such as modulus, is minimized even though a crystalline resin is used. And the air permeability is improved.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｌ 15/02 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display area C08L 15/02
Claims (1)
チルゴム３０〜９０重量％と天然ゴムおよび／またはイ
ソプレンゴム７０〜１０重量％とからなるゴム分１００
重量部に対して、融点が６０〜１１０℃の範囲内にある
シンジオタクチック−１，２−ポリブタジエンを３〜３
０重量部配合したゴム組成物をインナーライナーに用い
たことを特徴とする空気入りタイヤ。1. A rubber component 100 comprising 30 to 90% by weight of butyl rubber and / or halogenated butyl rubber and 70 to 10% by weight of natural rubber and / or isoprene rubber.
3 to 3 parts by weight of syndiotactic-1,2-polybutadiene having a melting point of 60 to 110 ° C. relative to parts by weight.
A pneumatic tire comprising a rubber composition containing 0 part by weight of an inner liner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04260527A JP3090792B2 (en) | 1992-09-04 | 1992-09-04 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04260527A JP3090792B2 (en) | 1992-09-04 | 1992-09-04 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0687975A true JPH0687975A (en) | 1994-03-29 |
| JP3090792B2 JP3090792B2 (en) | 2000-09-25 |
Family
ID=17349206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04260527A Expired - Fee Related JP3090792B2 (en) | 1992-09-04 | 1992-09-04 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3090792B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003089731A (en) * | 2001-09-18 | 2003-03-28 | Bridgestone Corp | Oil extended rubber, rubber composition in which the same rubber is compounded, tire using the same composition in tread rubber and tire for competition |
| JP2007069775A (en) * | 2005-09-07 | 2007-03-22 | Sumitomo Rubber Ind Ltd | Runflat tire |
| JP2008031342A (en) * | 2006-07-31 | 2008-02-14 | Sumitomo Rubber Ind Ltd | Rubber composition for inner liner and tire having inner liner using the same |
| JP2008068831A (en) * | 2006-09-15 | 2008-03-27 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| JP2008149928A (en) * | 2006-12-19 | 2008-07-03 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| WO2019163869A1 (en) | 2018-02-21 | 2019-08-29 | 株式会社ブリヂストン | Production method for vulcanized rubber composition |
| WO2021039408A1 (en) | 2019-08-28 | 2021-03-04 | 株式会社ブリヂストン | Vulcanized rubber composition, production method for vulcanized rubber composition, and tire |
| WO2021039602A1 (en) | 2019-08-28 | 2021-03-04 | 株式会社ブリヂストン | Rubber composition and tire |
| WO2021251167A1 (en) | 2020-06-08 | 2021-12-16 | 株式会社ブリヂストン | Pneumatic tire |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06173544A (en) * | 1992-12-07 | 1994-06-21 | Fumitane Ichikawa | Shutter door |
-
1992
- 1992-09-04 JP JP04260527A patent/JP3090792B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003089731A (en) * | 2001-09-18 | 2003-03-28 | Bridgestone Corp | Oil extended rubber, rubber composition in which the same rubber is compounded, tire using the same composition in tread rubber and tire for competition |
| JP2007069775A (en) * | 2005-09-07 | 2007-03-22 | Sumitomo Rubber Ind Ltd | Runflat tire |
| JP2008031342A (en) * | 2006-07-31 | 2008-02-14 | Sumitomo Rubber Ind Ltd | Rubber composition for inner liner and tire having inner liner using the same |
| JP2008068831A (en) * | 2006-09-15 | 2008-03-27 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| JP2008149928A (en) * | 2006-12-19 | 2008-07-03 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| WO2019163869A1 (en) | 2018-02-21 | 2019-08-29 | 株式会社ブリヂストン | Production method for vulcanized rubber composition |
| WO2021039408A1 (en) | 2019-08-28 | 2021-03-04 | 株式会社ブリヂストン | Vulcanized rubber composition, production method for vulcanized rubber composition, and tire |
| WO2021039602A1 (en) | 2019-08-28 | 2021-03-04 | 株式会社ブリヂストン | Rubber composition and tire |
| WO2021251167A1 (en) | 2020-06-08 | 2021-12-16 | 株式会社ブリヂストン | Pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3090792B2 (en) | 2000-09-25 |
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