JPH07315011A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH07315011A JPH07315011A JP6108574A JP10857494A JPH07315011A JP H07315011 A JPH07315011 A JP H07315011A JP 6108574 A JP6108574 A JP 6108574A JP 10857494 A JP10857494 A JP 10857494A JP H07315011 A JPH07315011 A JP H07315011A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- ice
- pneumatic tire
- resin
- foamed
- 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 64
- 239000005060 rubber Substances 0.000 claims abstract description 64
- 238000005187 foaming Methods 0.000 claims abstract description 26
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004088 foaming agent Substances 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims abstract description 12
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims abstract description 8
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 7
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 7
- 229920001194 natural rubber Polymers 0.000 claims abstract description 7
- 229920003051 synthetic elastomer Polymers 0.000 claims abstract description 7
- 239000005061 synthetic rubber Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 17
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 7
- 239000002174 Styrene-butadiene Substances 0.000 claims description 6
- 239000011115 styrene butadiene Substances 0.000 claims description 6
- 150000001993 dienes Chemical class 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000011347 resin Substances 0.000 abstract description 18
- 229920005989 resin Polymers 0.000 abstract description 18
- 238000005299 abrasion Methods 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 230000002393 scratching effect Effects 0.000 abstract description 2
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 abstract 1
- 238000006748 scratching Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 238000004073 vulcanization Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 5
- 235000019399 azodicarbonamide Nutrition 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 229920001821 foam rubber Polymers 0.000 description 4
- 239000004156 Azodicarbonamide Substances 0.000 description 3
- VJRITMATACIYAF-UHFFFAOYSA-N benzenesulfonohydrazide Chemical compound NNS(=O)(=O)C1=CC=CC=C1 VJRITMATACIYAF-UHFFFAOYSA-N 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013329 compounding Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- ALIFPGGMJDWMJH-UHFFFAOYSA-N n-phenyldiazenylaniline Chemical compound C=1C=CC=CC=1NN=NC1=CC=CC=C1 ALIFPGGMJDWMJH-UHFFFAOYSA-N 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000010058 rubber compounding Methods 0.000 description 2
- YFYZPVXABJAXSL-UHFFFAOYSA-N 2,3-dinitrosobenzene-1,4-dicarboxamide Chemical compound NC(=O)C1=CC=C(C(N)=O)C(N=O)=C1N=O YFYZPVXABJAXSL-UHFFFAOYSA-N 0.000 description 1
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920003244 diene elastomer Polymers 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 150000002832 nitroso derivatives Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 125000005147 toluenesulfonyl group Chemical group C=1(C(=CC=CC1)S(=O)(=O)*)C 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
Landscapes
- Tires In General (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Tyre Moulding (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐摩耗性及び氷上での
走行に優れた空気入りタイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire excellent in wear resistance and running on ice.
【０００２】[0002]
【従来の技術】従来、冬季における空気入りタイヤは、
氷路上での性能を満足させるために、スパイクピンを打
ち込み使用又はチェーン等を使用していたが、スパイク
ピン等による粉塵問題や道路メインテナンスの問題か
ら、スパイクピンの使用が見合わさられ、タイヤ製造各
社共、これに代替するスタッドレスタイヤを提供するに
至っている。スタッドレスタイヤのゴム質では、ガラス
転移温度（Ｔｇ）の低いポリマーを用いることにより、
または、硬さ（Ｈｄ）の低いトレッドゴムを用いること
により氷上性能を向上させている。また、独立気泡から
なる発泡ゴムを用いて、氷上の水膜を除去して、氷上性
能を向上させることもできる。さらに、トレッドゴム中
に非補強性異物を混入している例もある。2. Description of the Related Art Conventionally, pneumatic tires in winter are
In order to satisfy the performance on the icy road, spike pins were used or chains were used, but due to dust problems due to spike pins etc. and road maintenance problems, the use of spike pins was canceled and tire manufacturing Each company has come to provide studless tires that replace them. In the rubber material of studless tires, by using a polymer with a low glass transition temperature (Tg),
Alternatively, the performance on ice is improved by using a tread rubber having a low hardness (Hd). Further, the foamed rubber made of closed cells can be used to remove the water film on the ice to improve the performance on ice. Furthermore, there are also examples in which a non-reinforcing foreign substance is mixed in the tread rubber.
【０００３】低Ｈｄのゴムをトレッド部に用いた重荷重
用空気入りタイヤにおいては、水膜ができ易く、しか
も、水膜を充分に除去することができないので、氷上性
能が十分でないという課題がある。また、トレッド部の
ゴムの発泡率を増加した空気入りタイヤでは、氷上性能
は向上するが、耐摩耗性は著しく低下するという課題が
ある。さらに、非補強性の異物を混入した空気入りタイ
ヤでは、摩耗後、異物が抜け落ち、氷をひっかく効果は
なく、しかも、耐摩耗性を低下させるという課題があ
る。In a heavy-duty pneumatic tire using a rubber of low Hd in the tread portion, a water film is easily formed, and further, the water film cannot be sufficiently removed, so that there is a problem that the performance on ice is not sufficient. . Further, a pneumatic tire having an increased foaming rate of rubber in the tread portion has a problem that the on-ice performance is improved, but the wear resistance is significantly reduced. Further, in a pneumatic tire containing a non-reinforcing foreign substance, there is a problem that after the abrasion, the foreign substance comes off, the ice is not scratched, and the abrasion resistance is reduced.
【０００４】このように従来の冬季における空気入りタ
イヤは、氷上性能を向上させようとすれば耐摩耗性が低
下するなどの課題があり、耐摩耗性と氷上性能とは二律
背反となり、耐摩耗性と氷上性能とを共に満足できる空
気入りタイヤが切望されている。As described above, conventional pneumatic tires in winter have problems such as a decrease in wear resistance when trying to improve the performance on ice, and there is a trade-off between wear resistance and performance on ice. There is a strong demand for pneumatic tires that can satisfy both the requirements and performance on ice.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、上記
従来の課題を解決するものであり、耐摩耗性に優れ、か
つ、氷雪上での走行に優れた空気入りタイヤを提供する
ことを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and to provide a pneumatic tire having excellent wear resistance and excellent running on ice and snow. To aim.
【０００６】[0006]
【課題を解決するための手段】本発明者は、前記課題を
解決するため、鋭意研究を行った結果、空気入りタイヤ
のトレッド部のゴムを天然ゴム及びジエン系合成ゴムか
らなる群から選ばれた少なくとも１種のゴム分１００重
量部に対して、特定のポリマーを特定量及び発泡剤を配
合した発泡ゴム組成物からなる発泡ゴムから構成し、か
つ、この発泡トレッドゴムの発泡率を特定することによ
り目的の空気入りタイヤを得ることに成功し、本発明を
完成するに至ったのである。すなわち、本発明の空気入
りタイヤは、トレッド部のゴムが天然ゴムおよびジエン
系合成ゴムからなる群から選ばれた少なくとも１種のゴ
ム分１００重量部に対して、スチレンブタジエンブロッ
クポリマー５〜３０重量部及び発泡剤を配合してなる発
泡ゴム組成物から構成された発泡ゴムからなり、該発泡
ゴムの発泡率が３〜３０％に設定されたことを特徴とす
る。スチレンブタジエンブロックポリマーは、融点が１
２０〜２１０℃、平均粒径３０〜３００μｍであり、ス
チレン分が４０〜８０％であることが好ましい。Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have selected the rubber of the tread portion of a pneumatic tire from the group consisting of natural rubber and diene synthetic rubber. And a foamed rubber composition comprising a foamed rubber composition in which a specific amount of a specific polymer and a foaming agent are mixed with 100 parts by weight of at least one rubber component, and the foaming ratio of the foamed tread rubber is specified. As a result, the desired pneumatic tire was successfully obtained, and the present invention was completed. That is, in the pneumatic tire of the present invention, the rubber of the tread portion is 5 to 30 parts by weight of the styrene-butadiene block polymer with respect to 100 parts by weight of at least one kind of rubber selected from the group consisting of natural rubber and diene synthetic rubber. And a foaming agent, and a foamed rubber composition made of a foamed rubber composition. The foamed rubber has a foaming ratio of 3 to 30%. Styrene butadiene block polymer has a melting point of 1
It is preferable that the temperature is 20 to 210 ° C., the average particle size is 30 to 300 μm, and the styrene content is 40 to 80%.
【０００７】[0007]
【作用】本発明の空気入りタイヤは、トレッド部のゴム
を天然ゴム及びジエン系合成ゴムからなる群から選ばれ
た少なくとも１種のゴム分１００重量部に対して、特定
のポリマーを特定量及び発泡剤を配合した発泡ゴム組成
物を用いることにより構成し、かつ、発泡トレッドゴム
の発泡率を特定したものであり、特定の配合割合となる
特定のポリマーの使用及び特定の発泡率となる発泡ゴム
により初めて耐摩耗性と氷上での走行性能とを共に両立
するという新たな事実に基づくものであり、それぞれの
条件を部分的に満足しても本発明の目的は達成されない
ものである（この点に関しては、更に実施例等で詳しく
説明する）。In the pneumatic tire of the present invention, the rubber of the tread portion is 100 parts by weight of at least one rubber selected from the group consisting of natural rubber and diene-based synthetic rubber, and a specific amount of the specific polymer is It is configured by using a foamed rubber composition containing a foaming agent, and the foaming rate of foamed tread rubber is specified. The use of a specific polymer having a specific blending ratio and the foaming having a specific foaming rate. It is based on the new fact that both rubber has both wear resistance and running performance on ice for the first time, and the object of the present invention is not achieved even if each of the conditions is partially satisfied (this The points will be further described in detail in Examples and the like).
【０００８】以下、本発明の内容を説明する。本発明に
おける空気入りタイヤは、トレッド部のゴムが、天然ゴ
ムおよびジエン系合成ゴムからなる群から選ばれた少な
くとも１種のゴム分１００重量部に対して、スチレンブ
タジエンブロックポリマーを５〜３０重量部及び発泡剤
を配合してなる発泡ゴム組成物から構成された発泡ゴム
からなり、該発泡ゴムの発泡率が３〜３０％に設定され
たものである。The contents of the present invention will be described below. In the pneumatic tire of the present invention, the rubber of the tread portion is 5 to 30 parts by weight of the styrene-butadiene block polymer based on 100 parts by weight of at least one rubber selected from the group consisting of natural rubber and diene-based synthetic rubber. And a foaming agent, the foamed rubber composition is made of a foamed rubber composition, and the foamed rubber has a foaming rate of 3 to 30%.
【０００９】本発明で用いるスチレンブタジエンブロッ
クポリマー（以下、「ＳＢ樹脂」という）は、氷上での
引っかき効果を付与するために配合するものであり、そ
の配合量は５〜３０重量部、好ましくは、１０〜２０重
量部である。配合量が５重量部未満では、本発明の十分
な効果得られず、また、３０重量部超過では、耐摩耗性
が低下し、実用性に十分でなく、また、作業性も大幅に
悪化し好ましくない。好ましいＳＢ樹脂としては、融点
が１２０〜２１０℃、平均粒径が３０〜５００μｍであ
り、スチレン分が４０〜８０％であるものが望ましく、
特に好ましいＳＢ樹脂は、融点が１４０〜１８０℃、平
均粒径が７０〜２００μｍ、スチレン分が６５％である
ことが望ましい。The styrene-butadiene block polymer (hereinafter referred to as "SB resin") used in the present invention is blended to impart a scratching effect on ice, and its blending amount is 5 to 30 parts by weight, preferably , 10 to 20 parts by weight. If the blending amount is less than 5 parts by weight, the sufficient effect of the present invention cannot be obtained, and if it exceeds 30 parts by weight, the abrasion resistance is lowered, the practicality is not sufficient, and the workability is significantly deteriorated. Not preferable. A preferable SB resin has a melting point of 120 to 210 ° C., an average particle diameter of 30 to 500 μm, and a styrene content of 40 to 80%,
Particularly preferable SB resin has a melting point of 140 to 180 ° C., an average particle diameter of 70 to 200 μm, and a styrene content of 65%.
【００１０】融点が１２０℃未満では、混練時に溶解
し、原形をとどめられず、また、樹脂内で発泡が起こり
好ましくない。融点が２１０℃超過では、十分な共加硫
性が得られず、好ましくない。平均粒径が３０μｍ未満
では、本発明の効果が少なく、５００μｍ超過では、耐
摩耗性の低下を招き好ましくない。スチレン分が４０％
未満では、硬さが不足し、十分な効果が得られず、ま
た、８０％超過では、共加硫性が不足し好ましくない。If the melting point is less than 120 ° C., it is not preferable because it melts during kneading, the original shape cannot be maintained, and foaming occurs in the resin. If the melting point exceeds 210 ° C, sufficient co-vulcanizability cannot be obtained, which is not preferable. If the average particle size is less than 30 μm, the effect of the present invention is small, and if it exceeds 500 μm, abrasion resistance is deteriorated, which is not preferable. 40% styrene content
If it is less than 80%, the hardness is insufficient and a sufficient effect cannot be obtained, and if it exceeds 80%, the covulcanizability is insufficient, which is not preferable.
【００１１】本発明の空気入りタイヤのトレッド部に使
用する発泡ゴム組成物のゴム分としては、例えば、天然
ゴム、合成ポリイソプレンゴム、スチレン−ブタジエン
共重合ゴム、ポリブタジエンゴム、ブチルゴムなどのジ
エン系ゴムが挙げられ、これらのゴムを単独若しくは２
種以上併用することができる。Examples of the rubber component of the foamed rubber composition used in the tread portion of the pneumatic tire of the present invention include diene rubbers such as natural rubber, synthetic polyisoprene rubber, styrene-butadiene copolymer rubber, polybutadiene rubber and butyl rubber. Rubber, and these rubbers may be used alone or 2
One or more species can be used in combination.
【００１２】また、発泡ゴム組成物の発泡剤としては、
例えば、アゾジカルボンアミド（ＡＤＣＡ）、アゾビス
ホルムアミド（ＡＢＦＡ）、アゾビスインブチロニトリ
ル（ＡＩＢＮ）、ジアゾアミノベンゼン（ＤＡＢ）等の
アゾ系化合物、Ｎ，Ｎ´−ジニトロソペンタメチレンテ
トラミン（ＤＰＴ）、Ｎ，Ｎ´−ジメチルーＮ，Ｎ´−
ジニトロソテレフタルアミド（ＤＭＤＮＴＡ）等のニト
ロソ系化合物、Ｐ，Ｐ´−オキシビス（ベンゼンスルホ
ニルヒドラジド［ＯＢＳＨ］）、ベンゼンスルホニルヒ
ドラジド（ＢＳＨ）、トルエンスルホニルヒドラジド
（ＴＳＨ）等のヒドラジド系化合物などの分散型発泡
剤、すなわち、加硫温度で分解してガスを放出する化合
物が挙げられる。また、アゾジカルボンアミド（ＡＤＣ
Ａ）等の分解温度が高い発泡剤を使用する場合は、尿
素、尿素誘導体などの発泡助剤を必要に応じて配合して
分解温度を下げることもできる。Further, as the foaming agent of the foamed rubber composition,
For example, azo compounds such as azodicarbonamide (ADCA), azobisformamide (ABFA), azobisinbutyronitrile (AIBN) and diazoaminobenzene (DAB), N, N′-dinitrosopentamethylenetetramine (DPT) ), N, N'-dimethyl-N, N'-
Dispersion type of nitroso compounds such as dinitrosoterephthalamide (DMDNTA), hydrazide compounds such as P, P'-oxybis (benzenesulfonyl hydrazide [OBSH]), benzenesulfonyl hydrazide (BSH) and toluenesulfonyl hydrazide (TSH) Blowing agents, i.e. compounds that decompose at the vulcanization temperature and release a gas are mentioned. In addition, azodicarbonamide (ADC
When a foaming agent having a high decomposition temperature such as A) is used, a foaming auxiliary agent such as urea or a urea derivative may be blended as necessary to lower the decomposition temperature.
【００１３】さらに、本発明の空気入りタイヤのトレッ
ド部に使用する発泡ゴム組成物は、前記ＳＢ樹脂、ゴム
分及び発泡剤以外に、カーボンブラック等の補強剤、加
硫剤、軟化剤、老化防止剤、加硫促進剤、加硫促進助剤
等の通常ゴム工業で使用される種々のゴム用配合剤を適
宜配合することができる。Further, the foamed rubber composition used in the tread portion of the pneumatic tire of the present invention has a reinforcing agent such as carbon black, a vulcanizing agent, a softening agent and an aging agent in addition to the SB resin, the rubber component and the foaming agent. Various rubber compounding agents usually used in the rubber industry, such as an inhibitor, a vulcanization accelerator, and a vulcanization acceleration aid, can be appropriately mixed.
【００１４】本発明において発泡率が３〜３０％に調整
された発泡トレッドゴムは、前記ＳＢ樹脂、ゴム分、上
記発泡剤及び必要に応じて配合される上記種々のゴム用
配合剤からなる発泡ゴム組成物を、通常の加工装置、例
えば、ロール、バンバリーミキサー、ニーダー等により
混練することにより未加硫ゴムを作製し、加硫工程（加
硫温度１４５℃、加硫時間３３分）で発泡させることに
より製造される。製造された発泡ゴムは、独立気泡構造
であり、発泡率（３〜３０％）は、発泡剤の配合量、設
定加硫温度等に調整され、好ましい発泡率は１０〜２０
％である。発泡率が３％未満の発泡ゴムでは、本発明の
効果が少なく、発泡率が３０％超過では、耐摩耗性の低
下を招き、著しく氷上性能を飽和させることとなり好ま
しくない。In the present invention, the foamed tread rubber whose foaming ratio is adjusted to 3 to 30% is a foamed product comprising the SB resin, the rubber component, the foaming agent, and the above-mentioned various rubber compounding agents which are compounded as necessary. An unvulcanized rubber is produced by kneading the rubber composition with an ordinary processing device such as a roll, a Banbury mixer, a kneader, and foaming in a vulcanization step (vulcanization temperature 145 ° C., vulcanization time 33 minutes). It is manufactured by The produced foamed rubber has a closed cell structure, and the foaming rate (3 to 30%) is adjusted to the compounding amount of the foaming agent, the set vulcanization temperature, etc., and the preferable foaming rate is 10 to 20.
%. If the foaming rate is less than 3%, the effect of the present invention is small, and if the foaming rate exceeds 30%, the abrasion resistance is deteriorated and the performance on ice is significantly saturated, which is not preferable.
【００１５】本発明の空気入りタイヤは、上記発泡ゴム
組成物により発泡率が３〜３０％からなる独立気泡型構
造の発泡トレッドゴムを作製し、この発泡トレッドゴム
を使用して常法により製造でき、特に、重荷重用に適す
るものである。平均接地圧では、４〜１２Kg／cm2、Ｈ
ｄでは常温で５５〜７０であることが好ましい。本発明
の空気入りタイヤでは、図１に示すように、氷上部１上
で、水膜２をトレッド部としての発泡ゴム３により除水
する効果と発泡ゴム３に含まれるＳＢ樹脂４による氷を
引かく効果の相乗効果により氷上性能が向上することと
なる。また、マトリクスと樹脂が共加硫するため耐摩耗
性能を低下させない。なお、マトリクスのガラス転移温
度（Ｔｇ）は、−５０℃以下であることが好ましい。The pneumatic tire of the present invention is produced by a conventional method using the foamed rubber composition to prepare a foamed tread rubber having a closed cell structure having a foaming ratio of 3 to 30% and using the foamed tread rubber. In particular, it is suitable for heavy loads. Average ground pressure is 4-12Kg / cm 2 , H
It is preferable that d is 55 to 70 at room temperature. In the pneumatic tire of the present invention, as shown in FIG. 1, the effect of removing the water film 2 on the ice upper portion 1 by the foam rubber 3 as the tread portion and the ice by the SB resin 4 contained in the foam rubber 3 are removed. The synergistic effect of the pulling effect improves the performance on ice. Further, since the matrix and the resin are co-vulcanized, the abrasion resistance does not deteriorate. The glass transition temperature (Tg) of the matrix is preferably −50 ° C. or lower.
【００１６】[0016]
【実施例】以下に、実施例及び比較例等により、本発明
を更に具体的に説明するが、本発明は、これらの実施例
等によって、何等限定されるものではない。EXAMPLES The present invention will be described in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples and the like.
【００１７】（実施例１〜８、比較例１〜２）下記表１
に示される配合組成でバンバリーミキサーを用いて混練
し、各種タイヤトレッド用ゴム組成物を調製した。この
各種タイヤトレッド用ゴム組成物を加硫（加硫温度１４
５℃、加硫時間３３分）してタイヤトレッドゴムを作製
した。各トレッドゴムの発泡率（％）、Ｈｄを測定し
た。また、この各トレッドゴムを使用して試験タイヤ
（サイズ １１Ｒ２２．５）を作製して耐摩耗性能、氷
上性能を評価した。これらの結果を下記表１に示す。(Examples 1-8, Comparative Examples 1-2) Table 1 below
A rubber composition for various tire treads was prepared by kneading with the compounding composition shown in (1) using a Banbury mixer. The various rubber compositions for tire treads were vulcanized (vulcanization temperature 14
A tire tread rubber was prepared by curing at 5 ° C for 33 minutes. The foaming rate (%) and Hd of each tread rubber were measured. Further, a test tire (size 11R22.5) was produced using each of these tread rubbers, and the wear resistance performance and the performance on ice were evaluated. The results are shown in Table 1 below.
【００１８】発泡率（％）、Ｈｄ、耐摩耗性能、氷上性
能の測定は、下記の方法等により行った。 (1) 発泡率（％） 発泡率（Ｖｓ）は、下記式により求めた。 Ｖｓ（％）＝（Ｐ0／Ｐ1−１）×１００（％） Ｐ0：ゴム周相部の密度 Ｐ1：発泡ゴムの密度 (2) Ｈｄ ＪＩＳ Ａ Ｈｄテスターにより準拠して測定した。The foaming rate (%), Hd, abrasion resistance, and performance on ice were measured by the following methods. (1) Foaming rate (%) The foaming rate (Vs) was calculated by the following formula. Vs (%) = (P 0 / P 1 −1) × 100 (%) P 0 : Density of rubber peripheral phase portion P 1 : Density of foamed rubber (2) Hd Measured according to JIS A Hd tester.
【００１９】(3) 耐摩耗性能 各試験タイヤ１０本を積載荷重１０tonのトラックに装
着し、約２万ｋｍ走行後、溝深さの平均から１ｍｍ当た
りの走行距離を求めた。数値が大きいほど耐摩耗性が良
好なことを示す。 (4) 氷上性能 各試験タイヤ１０本を積載荷重１０tonのトラックに装
着し、外気温−５℃の氷上で制動距離を求めた。(3) Abrasion resistance performance Ten test tires were mounted on a truck with a loading capacity of 10 tons, and after running about 20,000 km, the running distance per 1 mm was obtained from the average groove depth. The larger the value, the better the wear resistance. (4) Ice performance Ten test tires were mounted on a truck with a loading capacity of 10 tons, and the braking distance was determined on ice with an outside air temperature of -5 ° C.
【００２０】[0020]
【表１】 [Table 1]
【００２１】次に、耐摩耗性能及び氷上性能の関係につ
いて評価した結果を図２に示す。図２において、横軸は
耐摩耗性能、縦軸は氷上性能であり、Ａ曲線は従来の発
泡ゴムのみからなる空気入りタイヤ、Ｂ曲線はＳＢ樹脂
のみからなる空気入りタイヤ、Ｃ曲線は本発明のＳＢ樹
脂＋発泡ゴムからなる空気入りタイヤの場合であり、共
にＳＢ樹脂、発泡率等を変動した場合の耐摩耗性能及び
氷上性能の関係を示す。Next, FIG. 2 shows the result of evaluation of the relationship between the wear resistance performance and the performance on ice. In FIG. 2, the horizontal axis represents wear resistance performance, the vertical axis represents ice performance, the A curve is a conventional pneumatic tire made only of foamed rubber, the B curve is a pneumatic tire made only of SB resin, and the C curve is the present invention. 2 shows the relationship between the abrasion resistance performance and the on-ice performance when the SB resin, the foaming rate, etc. are both changed.
【００２２】〔上記表１及び図２の考察〕実施例１〜７
は、本発明の範囲でＳＢ樹脂、発泡率等を変動した場合
であり、図２に示されるＣ曲線の最適域が本発明の範囲
である。これに対して、比較例１〜３は、本発明の範囲
外となるものであり、比較例１は従来の発泡ゴムのみか
らなる空気入りタイヤ（図２に示されるＡ曲線）、比較
例２は従来のノーマルな空気入りタイヤ、比較例３はＳ
Ｂ樹脂のみからなる空気入りタイヤ（図２に示されるＢ
曲線）である。この表１及び図２から明らかなように、
本発明では、発泡のみ（比較例１）又はＳＢ樹脂のみ
（比較例３）では到達できない領域、すなわち、本発明
の範囲で耐摩耗性能及び氷上性能のすべてを著しく向上
できることが判明した。[Discussion of Table 1 and FIG. 2] Examples 1 to 7
Shows the case where the SB resin, the foaming rate, etc. are changed within the range of the present invention, and the optimum range of the C curve shown in FIG. 2 is the range of the present invention. On the other hand, Comparative Examples 1 to 3 are out of the scope of the present invention, and Comparative Example 1 is a pneumatic tire made of only conventional foamed rubber (A curve shown in FIG. 2), Comparative Example 2 Is a conventional normal pneumatic tire, Comparative Example 3 is S
Pneumatic tire consisting of B resin only (B shown in FIG. 2
Curve). As is clear from Table 1 and FIG.
In the present invention, it has been found that the wear resistance performance and the performance on ice can be remarkably improved in a region that cannot be reached only by foaming (Comparative Example 1) or SB resin (Comparative Example 3), that is, in the range of the present invention.
【００２３】[0023]
【発明の効果】本発明によれば、実用に耐える耐摩耗性
を保ちながら氷上性能が大幅に向上することができる空
気入りタイヤが提供される。特に、０℃付近の水膜の発
生しやすい領域においては、発泡ゴムが水膜を除去し、
樹脂部が氷を引かくことにより、氷上における制動駆動
性能及び操縦安定性を大幅に向上させることができる。Industrial Applicability According to the present invention, there is provided a pneumatic tire capable of significantly improving on-ice performance while maintaining wear resistance for practical use. In particular, in the region around 0 ° C where a water film is likely to occur, the foam rubber removes the water film
By the resin portion pulling the ice, the braking drive performance and the steering stability on the ice can be significantly improved.
【図１】本発明の要旨を示す概略断面図である。FIG. 1 is a schematic sectional view showing the gist of the present invention.
【図２】耐摩耗性能（横軸）と氷上性能（縦軸）との関
係を示すグラフである。FIG. 2 is a graph showing the relationship between wear resistance performance (horizontal axis) and on-ice performance (vertical axis).
１ 氷上部 ３ トレッド部としての発泡ゴム 1 Ice top 3 Foam rubber as tread
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｌ 9/00 ＬＢＤ // Ｂ２９Ｋ 9:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display area C08L 9/00 LBD // B29K 9:00
Claims (2)
然ゴムおよびジエン系合成ゴムからなる群から選ばれた
少なくとも１種のゴム分１００重量部に対して、スチレ
ンブタジエンブロックポリマーを５〜３０重量部及び発
泡剤を配合してなる発泡ゴム組成物から構成された発泡
ゴムからなり、該発泡ゴムの発泡率が３〜３０％に設定
されたことを特徴としてなる空気入りタイヤ。1. The styrene-butadiene block polymer is contained in an amount of 5 to 30 parts by weight based on 100 parts by weight of at least one rubber selected from the group consisting of natural rubber and diene-based synthetic rubber for the rubber of the tread portion of a pneumatic tire. A pneumatic tire comprising a foamed rubber composed of a foamed rubber composition containing a rubber composition and a foaming agent, wherein the foamed rubber has a foaming rate of 3 to 30%.
は、融点が１２０〜２１０℃、平均粒径が３０〜５００
μｍであり、スチレン分が４０〜８０％である請求項１
記載の空気入りタイヤ。2. The styrene-butadiene block polymer has a melting point of 120 to 210 ° C. and an average particle diameter of 30 to 500.
The styrene content is 40 to 80%.
Pneumatic tire described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6108574A JPH07315011A (en) | 1994-05-23 | 1994-05-23 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6108574A JPH07315011A (en) | 1994-05-23 | 1994-05-23 | Pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07315011A true JPH07315011A (en) | 1995-12-05 |
Family
ID=14488273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6108574A Pending JPH07315011A (en) | 1994-05-23 | 1994-05-23 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07315011A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0734886A1 (en) * | 1995-03-29 | 1996-10-02 | Bridgestone Corporation | Foamed rubber compositions for pneumatic tires and method of producing the same |
| EP0969040A1 (en) * | 1998-07-03 | 2000-01-05 | Bridgestone Corporation | Rubber composition for tire tread and pneumatic tire |
-
1994
- 1994-05-23 JP JP6108574A patent/JPH07315011A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0734886A1 (en) * | 1995-03-29 | 1996-10-02 | Bridgestone Corporation | Foamed rubber compositions for pneumatic tires and method of producing the same |
| US5776991A (en) * | 1995-03-29 | 1998-07-07 | Bridgestone Corporation | Foamed rubber compositions for pneumatic tires and method of producing the same |
| US5968427A (en) * | 1995-03-29 | 1999-10-19 | Bridgestone Corporation | Foamed rubber compositions for pneumatic tires and method of producing the same |
| EP0969040A1 (en) * | 1998-07-03 | 2000-01-05 | Bridgestone Corporation | Rubber composition for tire tread and pneumatic tire |
| US6135180A (en) * | 1998-07-03 | 2000-10-24 | Bridgestone Corporation | Rubber composition for tread and pneumatic tire |
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