JPH01165637A - Rubber composition for tire tread - Google Patents
Rubber composition for tire treadInfo
- Publication number
- JPH01165637A JPH01165637A JP62322756A JP32275687A JPH01165637A JP H01165637 A JPH01165637 A JP H01165637A JP 62322756 A JP62322756 A JP 62322756A JP 32275687 A JP32275687 A JP 32275687A JP H01165637 A JPH01165637 A JP H01165637A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- weight
- parts
- pts
- rubber composition
- 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 title claims abstract description 80
- 239000005060 rubber Substances 0.000 title claims abstract description 80
- 239000000203 mixture Substances 0.000 title claims abstract description 29
- 229920006173 natural rubber latex Polymers 0.000 claims abstract description 12
- 229920003244 diene elastomer Polymers 0.000 claims abstract description 11
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 11
- 210000002966 serum Anatomy 0.000 claims abstract description 10
- 239000006229 carbon black Substances 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 abstract description 12
- 238000005299 abrasion Methods 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 12
- 229920001194 natural rubber Polymers 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 244000043261 Hevea brasiliensis Species 0.000 description 8
- 230000007423 decrease Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 229920003052 natural elastomer Polymers 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000004073 vulcanization Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 229920001195 polyisoprene Polymers 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000003811 acetone extraction Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- VRKQEIXDEZVPSY-UHFFFAOYSA-N 4-n-phenyl-4-n-propan-2-ylbenzene-1,4-diamine Chemical compound C=1C=C(N)C=CC=1N(C(C)C)C1=CC=CC=C1 VRKQEIXDEZVPSY-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 organic acid esters Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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、耐摩耗性を保持しながら、湿潤路及び雪氷路
の制動性能を改善し、しかもその性能を長く維持し得る
、全天候タイヤのトレッドに好適なタイヤレッド用ゴム
組成物に関する。Detailed Description of the Invention [Technical Field of the Invention] The present invention provides a tread for an all-weather tire that maintains wear resistance, improves braking performance on wet roads and snowy and icy roads, and maintains this performance for a long time. The present invention relates to a rubber composition suitable for tire red.
従来、湿潤路面での制動性能を向上させるため、Ａ、Ｃ
，Ｂａ５ｓｉ： ＲＣＴ ３８（１９６５）、Ｄ、Ｂｕ
ｌｇｉｎ、Ｇ、Ｄ。Conventionally, in order to improve braking performance on wet road surfaces, A and C
, Ba5si: RCT 38 (1965), D, Bu
lgin, G.D.
Ｈｕｂｂｅｒｄ、 Ｍ、Ｈ，Ｗａｌｔｅｒ； Ｐｒｏｃ
、４ｔｈ Ｒｕｂｂｅｒ Ｔｅｃｈ。Hubberd, M.H., Walter; Proc.
, 4th Rubber Tech.
Ｃｏｎｔ、 Ｌｏｎｄｏｎ １９３（１９６２）等の文
献で示されているように、スチレン−ブタジエン共重合
体ゴム、ブチルゴムやカーボンブラックを多量に使用す
る方法が知られている。しかし、このような方法をとる
と低温においてゴムの硬化が顕著となり雪氷路面での制
動性能が不足し、雪氷路を走行するタイヤに使用するト
レッド用ゴムとしては望ましくない。一方、雪氷路での
制動性能を向上させるため、特開昭５５−１３５１４９
号公報、特開昭５８−１９９２０３号公報、特開昭６０
−１３７９４５号公報に開示されているように、トレッ
ドゴムに軟化剤や可塑剤を多量配合したゴム組成物を用
いることにより低温時の硬度を下げる方法が知られてい
る。しかし、このような方法をとると湿潤路面での制動
性、操縦安定性が低下し、耐摩耗性の低下も著しくなる
という欠点がある。As shown in literature such as Cont., London 193 (1962), a method is known in which a large amount of styrene-butadiene copolymer rubber, butyl rubber, or carbon black is used. However, when such a method is adopted, the hardening of the rubber becomes noticeable at low temperatures, resulting in insufficient braking performance on snowy and icy roads, and is not desirable as a tread rubber for use in tires running on snowy and icy roads. On the other hand, in order to improve braking performance on snowy and icy roads,
No. 58-199203, Japanese Patent Application Laid-open No. 1982-1992
As disclosed in Japanese Patent No. 137945, a method is known in which the hardness at low temperatures is reduced by using a rubber composition in which a large amount of a softener or a plasticizer is blended into tread rubber. However, such a method has disadvantages in that braking performance and steering stability on wet road surfaces are reduced, and wear resistance is also significantly reduced.
ところで、タイヤは一般の走行時に発熱するため、トレ
・ノド内部の温度は６０℃以上にもなり、特にトレッド
表面は路面に対し加速・減速時の摩擦により１００℃以
上の高温になっていると推定される。ゴム組成物により
なるタイヤトレンドは、このような高温雰囲気中では、
空気中の酸素と反応し劣化することが知られており、こ
の劣化反応により、トレッドが変質し、新品時のタイヤ
性能が得られなくなる。特にスチレン−ブタジエン共重
合体ゴムをトレッド用ゴムに用いた場合、天然ゴム、ポ
リイソプレンゴム、およびポリブタジェンゴム等の他の
ジエン系ゴムよりも熱劣化により変質が著しくなるとい
う問題がある。By the way, tires generate heat during normal driving, so the temperature inside the tread and throat can reach over 60 degrees Celsius, and the tread surface in particular can reach temperatures of over 100 degrees Celsius due to friction against the road surface during acceleration and deceleration. Presumed. The trend in tires made of rubber compositions is that in such high-temperature atmospheres,
It is known that tires react with oxygen in the air and deteriorate, and this deterioration reaction causes the tread to change in quality, making it impossible to achieve the same tire performance as when new. In particular, when a styrene-butadiene copolymer rubber is used as a tread rubber, there is a problem in that it undergoes more significant deterioration due to thermal deterioration than other diene rubbers such as natural rubber, polyisoprene rubber, and polybutadiene rubber.
このように従来技術では、湿：Ａ回路面と積雪寒冷地に
おける雪氷路での制動性能を同時に改良し、しかもその
性質を維持しつつ耐摩耗性の低下を抑制したタイヤトレ
ッド用ゴム組成物を得ることは困難であった。In this way, the conventional technology has developed a rubber composition for tire treads that simultaneously improves the braking performance on wet A circuit surfaces and on snowy and icy roads in snowy and cold regions, while maintaining these properties and suppressing the decline in wear resistance. It was difficult to obtain.
本発明は、上記問題点を解消すべくなされたものであっ
て、耐摩耗性の低下を抑制しつつ湿潤路および雪水路に
おける制動性能を向上させ、しかもその性能を長く維持
し得るタイヤトレッド用ゴム組成物を提供することを目
的とする。The present invention has been made to solve the above-mentioned problems, and is intended for use in tire treads that can improve braking performance on wet roads and snowy roads while suppressing deterioration of wear resistance, and can maintain this performance for a long time. The purpose is to provide a rubber composition.
このため、本発明は、スチレン−ブタジエン共重合体ゴ
ムを２５〜１００重量部とジエン系ゴムの中から選ばれ
た１種以上のゴム７５重量部以下よりなる原料ゴム１０
０重量部に対し、カーボンブラックを４５〜１２０ Ｍ
Ｐ１部、軟化剤を２０〜１２０重量部、および天然ゴム
ラテックス漿液の粉末乾燥物を該粉末乾燥物中の非ゴム
成分量に換算して２〜１５重量部重量配合なることを特
徴とするタイヤトレンド用ゴム組成物を要旨とするもの
である。For this reason, the present invention provides raw material rubber 10 consisting of 25 to 100 parts by weight of styrene-butadiene copolymer rubber and 75 parts by weight or less of one or more rubbers selected from diene rubbers.
45 to 120 M of carbon black to 0 parts by weight
1 part of P, 20 to 120 parts by weight of a softener, and 2 to 15 parts by weight of a dried powder of natural rubber latex serum calculated as the amount of non-rubber components in the dried powder. This article focuses on trending rubber compositions.
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.
本発明者らは、従来技術では両立することが困難であっ
た湿潤路面と雪氷路面での制動性能を高いレベルで満足
し、しかも、その性能を長く維持させるために鋭意研究
を行なった結果、スチレン−ブタジエン共重体ゴム単独
又はジエン系ゴムの中から選ばれた１種以上のゴムとの
ブレンド物よりなる原料ゴムに対し、天然ゴムラテック
ス崇液中に含まれる非ゴム成分を一定量配合させてなる
ゴム組成物をトレッドゴムとして用いることで、上記目
的を達成できることを見い出し、本発明に至った。The inventors of the present invention have conducted extensive research in order to achieve a high level of braking performance on wet and snowy roads, which was difficult to achieve with conventional technology, and to maintain this performance for a long time. A fixed amount of non-rubber components contained in the natural rubber latex submersion liquid is blended into the raw material rubber, which is made of styrene-butadiene copolymer rubber alone or a blend with one or more rubbers selected from diene rubbers. The inventors have discovered that the above object can be achieved by using a rubber composition consisting of a tread rubber as a tread rubber, leading to the present invention.
すなわち、天然ゴムを原料ゴムとしたゴム組成物と該非
ゴム成分を含まないポリイソプレンゴムを原料ゴムとし
たゴム組成物との氷上摩擦力を比較したところ、低温時
硬度を同一にした場合、天然ゴムを原料ゴムとしたゴム
組成物の方が優れることを見い出した。本発明者らは、
天然ゴムとポリイソプレンゴムとの化学構造は似通って
いることから、その原因は天然ゴムに含まれていてポリ
イソプレンゴムには含まれていない非ゴム成分にあると
推定した。この知見から、更にあらかじめアセトン抽出
によりアセトン可溶分を抽出した後の天然ゴムを原料ゴ
ムとしたゴム組成物について調べたところ、アセトン抽
出処理を行なわない天然ゴムを原料ゴムとしたゴム組成
物に比較して氷上での摩擦力が低下することが判明した
。このことから、アセトン抽出された非ゴム成分は氷上
での摩擦力向上効果を有することが裏付けられた。In other words, when we compared the frictional force on ice between a rubber composition made from natural rubber and a rubber composition made from polyisoprene rubber that does not contain the non-rubber component, we found that when the hardness at low temperatures is the same, natural It has been found that a rubber composition using rubber as a raw material rubber is superior. The inventors
Since the chemical structures of natural rubber and polyisoprene rubber are similar, it was assumed that the cause was the non-rubber components contained in natural rubber but not in polyisoprene rubber. Based on this knowledge, we further investigated rubber compositions using natural rubber as a raw material rubber after previously extracting acetone-soluble components by acetone extraction, and found that rubber compositions using natural rubber as a raw material rubber that had not been subjected to acetone extraction treatment. In comparison, it was found that the frictional force on ice was reduced. This confirms that the non-rubber component extracted with acetone has the effect of improving frictional force on ice.
そこで、スチレン−ブタジエン共重合体ゴム単独または
ジエン系ゴムの中から選ばれた１種以上のゴムとのブレ
ンド物を原料として、これに天然ゴムラテックス漿液中
に含まれる非ゴム成分を一定量配合したところ、氷上で
の摩擦力のみならず、湿潤路面での摩擦力をも向上させ
ることを見い出した。同時に熱老化による物性変化およ
びそれに帰因する氷上摩擦力の低下も抑制する効果があ
ることが判った。Therefore, using styrene-butadiene copolymer rubber alone or a blend with one or more rubbers selected from diene rubbers as a raw material, a certain amount of non-rubber components contained in natural rubber latex serum is added to the raw material. They found that it not only improves the frictional force on ice but also on wet road surfaces. At the same time, it was found to be effective in suppressing changes in physical properties due to heat aging and the resulting decrease in frictional force on ice.
本発明者らはかかる知見を得て本発明に到達したのであ
る。The present inventors obtained this knowledge and arrived at the present invention.
（１）原料ゴム。(1) Raw rubber.
スチレン−ブタジエン共重合体ゴム２５〜１００重量部
およびジエン系ゴムから選ばれた１種以上のゴム７５本
部部以下とからなる。ジエン系ゴムは、０〜７５重量部
である。It consists of 25 to 100 parts by weight of styrene-butadiene copolymer rubber and up to 75 parts of one or more rubbers selected from diene rubbers. The amount of diene rubber is 0 to 75 parts by weight.
スチレン−ブタジエン共重合体ゴムが２５重量部未満で
は、氷上摩擦力は向上するものの湿潤路での摩擦力が不
足する。If the styrene-butadiene copolymer rubber is less than 25 parts by weight, the frictional force on ice will improve, but the frictional force on wet roads will be insufficient.
本発明で使用されるジエン系ゴムとしては、例えば天然
ゴム、ポリイソプレンゴムおよび１゜２結合単位が２０
％以下のポリブタジェンゴムの中から選ばれる。Examples of the diene rubber used in the present invention include natural rubber, polyisoprene rubber, and
% or less of polybutadiene rubber.
（２） カーボンブラック。(2) Carbon black.
本発明で使用されるカーボンブランクは、通常、トレッ
ド用として使用されるものであれば、特にその種類は限
定されない、カーボンブラック配合量は、原料ゴム１０
０重量部に対して４５〜１２０重量部である。４５重量
部未満では補強性で劣り、湿潤路面摩擦力が低下する。The carbon blank used in the present invention is not particularly limited in type as long as it is normally used for treads.The carbon black content is 10% of the raw rubber.
The amount is 45 to 120 parts by weight relative to 0 parts by weight. If the amount is less than 45 parts by weight, the reinforcing properties will be poor and the wet road friction force will decrease.
一方、１２０重量部を超えると混練性が悪化し、氷上摩
擦が不足し、好ましくない。On the other hand, if it exceeds 120 parts by weight, kneading properties deteriorate and friction on ice becomes insufficient, which is not preferable.
（３）軟化剤。(3) Softener.
本発明で用いる軟化剤としては、芳香族系オイル、パラ
フィン系オイル、ナフテン系オイルのようなプロセスオ
イルや有機酸エステル、ポリエーテル等であるが、これ
らのうちいずれかを単独あるいは２種以上混用してもよ
い、軟化剤の配合量は、原料ゴム１００ ！ｆｆｉ部に
対し２０〜１２０重量部である。２０重量部未満では氷
上摩擦力が不足し、１２０重量部を超えると混合作業性
が低下する。The softeners used in the present invention include process oils such as aromatic oils, paraffin oils, and naphthenic oils, organic acid esters, polyethers, etc., and any of these may be used alone or in combination of two or more. The amount of softener added is 100% of the raw rubber! The amount is 20 to 120 parts by weight based on part ffi. If it is less than 20 parts by weight, the frictional force on ice will be insufficient, and if it exceeds 120 parts by weight, mixing workability will be reduced.
（４） 天然ゴムラテックス漿液の粉末乾燥物。(4) Dry powder of natural rubber latex serum.
天然ゴムラテックス漿液とは、天然ゴムラテックスから
ゴム分を凝固させ、取り除いた残りの水溶液である。こ
れは、−船釣に約０．５重量％のゴム成分と約２．０重
量％の非ゴム成分を含む０本発明において用いる天然ゴ
ムラテックス漿液の粉末乾燥物は、天然ゴムラテックス
漿液から例えばスプレードライ法によりその水分を蒸発
させて乾燥させたもので、平均粒径１０〜１００μ−の
粉末状のものである。ここで、ｌＯμ−未満又は１００
μ−超では分散不良となり、体摩耗性が低下し、また充
分な効果が得られない。この粉末乾燥物の配合量は、該
粉末乾燥物中の非ゴム成分量に換算して原料ゴム１００
重量部に対し２〜１５重量部である。２重量部未満では
本発明の効果が顕著に見られず、１５重重量では氷上摩
擦力の改善が少なく、耐摩耗性の低下が問題となる。Natural rubber latex serum is an aqueous solution that remains after coagulating and removing the rubber component from natural rubber latex. - For boat fishing, the dried natural rubber latex serum powder used in the present invention contains about 0.5% by weight of rubber components and about 2.0% by weight of non-rubber components. It is dried by evaporating the water content using a spray drying method, and is in the form of a powder with an average particle size of 10 to 100 microns. where less than lOμ or 100
If it exceeds μ-, dispersion will be poor, body abrasion will be reduced, and sufficient effects will not be obtained. The blending amount of this dry powder is 100% of the raw rubber in terms of the amount of non-rubber components in the dry powder.
The amount is 2 to 15 parts by weight. If the weight is less than 2 parts by weight, the effect of the present invention will not be noticeable, and if the weight is 15 parts by weight, the improvement in frictional force on ice will be small and a decrease in wear resistance will become a problem.
なお、本発明のトレッド用ゴム組成物には、上記の原料
ゴムおよび配合剤以外に、加硫剤、加硫促進剤、加硫助
剤、老化防止剤等の配合剤が当業界の慣行に従い適宜適
量配合される。In addition to the raw material rubber and compounding agents described above, the rubber composition for tread of the present invention contains compounding agents such as a vulcanizing agent, a vulcanization accelerator, a vulcanization aid, and an anti-aging agent in accordance with the practice in the industry. It is blended in an appropriate amount.
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
下記表１に示す配合処方（重量部）により、表２に示す
各ゴム組成物（実施例１〜４、比較例１〜８）を調製し
、それぞれのゴム組成物につき下記の方法で加硫物物性
を評価した。この結果を表２に示す、なお、粉末乾燥物
の配合量は、その非ゴム成分量に換算した量である。各
ゴム組成物の調製は、硫黄、加硫促進剤以外の配合剤と
原料ゴムとを通常のバンバリー型ミキサーに混合して得
たマスターバッチに、オープンロールで硫黄、加硫促進
剤を加えてゴム組成物とすることによった。このゴム組
成物を１５０℃、３０分間加硫した後、次の方法でその
物性を評価した。Examples and Comparative Examples Each rubber composition shown in Table 2 (Examples 1 to 4, Comparative Examples 1 to 8) was prepared according to the formulation (parts by weight) shown in Table 1 below. The physical properties of the vulcanizate were evaluated using the following method. The results are shown in Table 2. Note that the blending amount of the dry powder is the amount converted to the amount of non-rubber components. Each rubber composition is prepared by adding sulfur and a vulcanization accelerator in an open roll to a masterbatch obtained by mixing ingredients other than sulfur and vulcanization accelerator and raw rubber in a normal Banbury type mixer. By making it into a rubber composition. After vulcanizing this rubber composition at 150° C. for 30 minutes, its physical properties were evaluated by the following method.
■ 至豊槻抗■肛璽：
ブリティッシュスキンドテスター使用。ＡＳＴＭＥ−３
０３−７４に準拠し、氷上路面として一６℃の氷板、湿
潤路面として湿潤セーフティウオーク（スリーエム製品
）をそれぞれ用いて測定した。■ Toyotsuki resistance ■ Anal seal: Used British Skind Tester. ASTME-3
03-74, using an ice plate at -6°C as the icy road surface and a wet safety walk (manufactured by 3M) as the wet road surface.
氷上については、加硫直後および空気中で１００℃で２
日間加熱処理後の材料を測定した。この結果により評価
した。For use on ice, immediately after vulcanization and in air at 100℃ for 2 hours.
The material was measured after being heat treated for one day. The results were evaluated.
■ 耐摩耗性の評価：
直径６０顛、厚さ１０ｍの円盤型加硫ゴムの試料を作製
し、これを回転ドラムに押しつけてスリップ率を２５％
に設定して一定時間摩耗させた後の減量分を摩耗量をし
て計算した。この結果により評価した。■ Evaluation of abrasion resistance: A disk-shaped vulcanized rubber sample with a diameter of 60 mm and a thickness of 10 m was prepared, and this was pressed against a rotating drum to achieve a slip rate of 25%.
The amount of wear was calculated by calculating the amount of wear after a set amount of wear for a certain period of time. The results were evaluated.
上記評価項目■、■は、標準試料（比較例１）の測定値
を１００として指数標示した。ただし、熱老化後の氷上
スキッド抵抗については、標準試料（比較例１）の加硫
直後の氷上スキッド抵抗の値を１００として指数標示し
た。The above evaluation items (■) and (■) are expressed as an index with the measured value of the standard sample (Comparative Example 1) set as 100. However, regarding the skid resistance on ice after heat aging, the value of the skid resistance on ice immediately after vulcanization of the standard sample (Comparative Example 1) was expressed as an index, with the value being 100.
表１
注）
ｍｌ Ｎ−イソプロピル−Ｎ−フェニル−ｐ−フェニ
レンジアミン。Table 1 Note) ml N-isopropyl-N-phenyl-p-phenylenediamine.
＊２ 天然ゴムラテックス漿液から得られる粒径１０〜
１００μＩの粉末乾燥物。*2 Particle size obtained from natural rubber latex serum: 10~
100μI dry powder.
＊３ Ｎ−オキシ−ジエチレンベンゾチアジル−２−ス
ルフェンアミド。*3 N-oxy-diethylenebenzothiazyl-2-sulfenamide.
（本真以下余白）
比較例２，３、および実施例１．２は、本発明でいうと
ころの粉末乾燥物の配合効果を示したものである。粉末
乾燥物中の非ゴム成分量に換算して２重量部未満（比較
例２）では、耐摩耗性の低下は少ないものの、氷上およ
び湿潤路面の摩擦力の改良が少ない。一方、１５重量部
超の配合の場合（比較例３）、氷上路面および湿潤路面
の摩擦の改良はもはや頭打ちの傾向を示し、むしろ耐摩
耗性の低下が顕著となり、好ましくない、非ゴム成分量
に換算した配合量が２重量部以上１５重量部以下の範囲
（実施例１．２）では、耐摩耗性の低下が少な（、氷上
路面および湿潤路面での摩擦力の改良が見られ、かつ熱
老化後の氷上摩擦力も良好に保持される。(Margins below the main text) Comparative Examples 2 and 3 and Example 1.2 demonstrate the effect of blending the dry powder as defined in the present invention. When the amount of non-rubber components in the dry powder is less than 2 parts by weight (Comparative Example 2), the abrasion resistance decreases little, but the improvement in frictional force on ice and wet road surfaces is small. On the other hand, in the case of a blend of more than 15 parts by weight (Comparative Example 3), the improvement in friction on icy and wet road surfaces tends to reach a plateau, and the wear resistance deteriorates more markedly, which is undesirable. When the blending amount is in the range of 2 parts by weight or more and 15 parts by weight or less (Example 1.2), there is little decrease in wear resistance (improvement in frictional force on icy and wet roads is observed, and Frictional force on ice is also well maintained after heat aging.
粉末乾燥物の平均粒子径の効果は、分散性との関係から
無視できない。平均粒子径が１００μｍを超えると（実
施例４）、著しく分散が悪化し、耐摩耗性が著しく低下
する。一方、平均粒径が１０〜１００８ｍの範囲内であ
れば（実施例２．３）、本発明の目的を満足することが
できる。The effect of the average particle size of the dry powder cannot be ignored in terms of its relationship with dispersibility. When the average particle diameter exceeds 100 μm (Example 4), dispersion deteriorates significantly and wear resistance significantly decreases. On the other hand, if the average particle size is within the range of 10 to 1008 m (Example 2.3), the object of the present invention can be satisfied.
本発明で用いる原料ゴムとしては、スチレン−ブタジエ
ン共重合体ゴム単独またはジエン系ゴムとのブレンド物
であるが、ジエン系ゴムとして、天然ゴムを用いた（実
施例４）にも本発明の効果が得られる。また、粉末乾燥
物を配合せずにスチレン−ブタジエン共重合体ゴム単独
で用いた場合（比較例５）、湿潤路面での摩擦力は良好
だが、氷上摩擦力が不足する。しかし、粉末乾燥物を配
合することにより（実施例５）、氷上摩擦力を著しく改
良し、かつ熱老化による性能低下をも抑えることができ
る。カーボンブラック配合量を４５重量部未満とした場
合（比較例７）、氷上摩擦力は著しく向上するものの、
湿潤路面での摩擦力および耐摩耗性の低下も著しく、実
用に供することができない。軟化剤の配合量を２０重量
部未満とした場合（比較例８）、氷上および湿潤路面で
の摩擦力が不足し、本発明の効果が得られない。The raw material rubber used in the present invention is a styrene-butadiene copolymer rubber alone or a blend with a diene rubber, but the effect of the present invention can also be obtained when natural rubber is used as the diene rubber (Example 4). is obtained. Further, when styrene-butadiene copolymer rubber alone is used without blending dry powder (Comparative Example 5), the frictional force on wet road surfaces is good, but the frictional force on ice is insufficient. However, by blending a dry powder (Example 5), it is possible to significantly improve the frictional force on ice and to suppress the deterioration in performance due to heat aging. When the carbon black content was less than 45 parts by weight (Comparative Example 7), although the frictional force on ice was significantly improved,
The frictional force and wear resistance on wet road surfaces are also significantly reduced, making it impossible to put it to practical use. When the blending amount of the softener is less than 20 parts by weight (Comparative Example 8), the frictional force on ice and wet road surfaces is insufficient, and the effects of the present invention cannot be obtained.
上述の実施例および比較例は、従来配合では実現困難で
あった氷上路面および湿潤路面での摩擦力を高め、しか
もその性能を長く維持し、耐摩耗性の低下を抑えるため
に、天然ゴムラテックス漿液より得られる粉末乾燥物を
特定量配合することが有効であることを例示したもので
ある。The above examples and comparative examples use natural rubber latex to increase the frictional force on icy and wet roads, which was difficult to achieve with conventional formulations, maintain this performance for a long time, and suppress the decline in wear resistance. This is an example of the effectiveness of blending a specific amount of dried powder obtained from serum.
以上説明したように、本発明のゴム組成物をタイヤトレ
ッド部に使用することにより、タイヤの耐摩耗性を保持
しなから雪氷路面および湿潤路面におけるタイヤの制動
性能を改善し、しかもその性能を長く維持することがで
きる。As explained above, by using the rubber composition of the present invention in the tire tread, it is possible to maintain the wear resistance of the tire, improve the braking performance of the tire on snowy and icy road surfaces and wet road surfaces, and improve the performance. Can be maintained for a long time.
代理人 弁理士 小 川 信 −Agent: Patent Attorney Nobuo Kogawa -
Claims (1)
部とジエン系ゴムの中から選ばれた１種以上のゴム７５
重量部以下よりなる原料ゴム１００重量部に対し、カー
ボンブラックを４５〜１２０重量部、軟化剤を２０〜１
２０重量部、および天然ゴムラテックス漿液の粉末乾燥
物を該粉末乾燥物中の非ゴム成分量に換算して２〜１５
重量部配合してなることを特徴とするタイヤトレッド用
ゴム組成物。25 to 100 parts by weight of styrene-butadiene copolymer rubber and one or more types of rubber selected from diene rubbers 75
45 to 120 parts by weight of carbon black and 20 to 1 part by weight of a softener to 100 parts by weight of raw rubber consisting of 100 parts by weight or less.
20 parts by weight, and 2 to 15 parts by weight of the dried natural rubber latex serum powder in terms of the amount of non-rubber components in the dried powder.
A rubber composition for a tire tread, characterized in that it contains parts by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322756A JPH01165637A (en) | 1987-12-22 | 1987-12-22 | Rubber composition for tire tread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322756A JPH01165637A (en) | 1987-12-22 | 1987-12-22 | Rubber composition for tire tread |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01165637A true JPH01165637A (en) | 1989-06-29 |
Family
ID=18147291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62322756A Pending JPH01165637A (en) | 1987-12-22 | 1987-12-22 | Rubber composition for tire tread |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01165637A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003091326A1 (en) * | 2002-04-23 | 2003-11-06 | Bridgestone Corporation | Rubber compositions containing rubber-containing coagulums and processes for production of the coagulums |
| JP2011111489A (en) * | 2009-11-25 | 2011-06-09 | Yokohama Rubber Co Ltd:The | Rubber composition for tire tread and pneumatic tire obtained using the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58152031A (en) * | 1982-03-04 | 1983-09-09 | Mitsubishi Chem Ind Ltd | Rubber composition |
| JPS6222837A (en) * | 1985-07-23 | 1987-01-31 | Yokohama Rubber Co Ltd:The | Reinforced natural rubber and production thereof |
-
1987
- 1987-12-22 JP JP62322756A patent/JPH01165637A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58152031A (en) * | 1982-03-04 | 1983-09-09 | Mitsubishi Chem Ind Ltd | Rubber composition |
| JPS6222837A (en) * | 1985-07-23 | 1987-01-31 | Yokohama Rubber Co Ltd:The | Reinforced natural rubber and production thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003091326A1 (en) * | 2002-04-23 | 2003-11-06 | Bridgestone Corporation | Rubber compositions containing rubber-containing coagulums and processes for production of the coagulums |
| JP2011111489A (en) * | 2009-11-25 | 2011-06-09 | Yokohama Rubber Co Ltd:The | Rubber composition for tire tread and pneumatic tire obtained using the same |
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