JP4036519B2 - Rubber composition for tire tread with improved processability - Google Patents
Rubber composition for tire tread with improved processability Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明はタイヤトレッド用ゴム組成物に関し、更に詳しくは未加硫時の加工性を改良した、加硫可能なシリカ配合タイヤトレッド用ゴム組成物に関する。本発明のタイヤトレッド用ゴム組成物は、例えばキャップトレッド、サイドトレッド及びアンダートレッド用として有用である。なお、ここで「シリカ」とは含水ケイ酸又は無水ケイ酸のことであり、ゴム用として用いられる窒素比表面積が５０〜３００ｍ2 ／ｇのものをいい、また、「加硫」とは、硫黄や過酸化物などによる架橋を含むものとする。
【０００２】
【従来の技術】
各種ゴムにシリカを配合したゴム組成物は知られており、例えば低発熱性で耐摩耗性などに優れたタイヤトレッド用ゴム組成物として使用されている。しかしながら、シリカを配合したタイヤトレッドは低転動抵抗で湿潤路のグリップ性は良いが未加硫配合物の粘度上昇、加硫遅延、混合まとまりの低下などが起り、生産性が悪化するという問題があった。特に、単純にシリカ及びカーボンを同時に混合した場合、カーボンとゴムは充分な接触及び反応が起こり充分な混合を促進するがシリカとは充分ではなく、シリカの分散不良を引き起こし充分なシリカの特性が生かされなかった。かかる問題を解決すべく、従来から種々の提案があるが、いずれも実用上満足のいくものとは言えないのが実情である。
【０００３】
例えば、ジエチレングリコールや脂肪酸を添加したり（例えばゴム工業便覧〈第四版〉，５１７〜５１８頁，平成６年発行参照）、カルボン酸金属塩を添加したり（例えばＴｉｒｅ Ｔｅｃｈｎｏｌｏｇｙ Ｉｎｔｅｒｎａｔｉｏｎａｌ １９９５，１０７〜１０８頁参照）、シリカを予じめシリコーンオイルで処理したり（例えば特開平６−２４８１１６号公報参照）することなどが提案されているが、いずれも実用上充分な方法とは言えない。更に、混合時の焼け発生やまとまりの低下に対しては、混合回数を増加するなどの方法をとる以外に方法が無く、また、カーボンとシリカを混合する場合にも、別々に混合するか、もしくは混合時間や混合回数を長くしているのが実状である。
【０００４】
【発明が解決しようとする課題】
従って、本発明の目的は前述の従来技術の問題点を排除して、シリカ配合加硫性ゴム組成物の特性、例えば低発熱性や耐摩耗性などの特性を実質的に損なうことなく、未加硫ゴム組成物の加工性を改良したシリカ配合加硫性タイヤトレッド用ゴム組成物を提供することにある。
【０００５】
【課題を解決するための手段】
本発明に従えば、ジエン系ゴム１００重量部、シリカ５〜８０重量部及び下記式（ VI ）で表わされるアルコキシシラン６０重量％以上と硫黄含有シランカップリング剤４０重量％以下を共加水分解、縮合して得られたポリシロキサンを含んでなるタイヤトレッド用ゴム組成物が提供される。
【００１２】
【化２】
（式中、Ｍｅはメチル基を示し、Ｒ2 はメチル基又はエチル基を示し、Ｒ3 は水素又は炭素数１〜２０のアルキル基を示し、ｎは１〜１００の整数であり、ｍは０又は１〜１０の整数である。）
【００１５】
本発明によればポリシロキサンに、シリカ表面のシラノールと結合するアルコキシシリル基だけでなく、ゴムと化学結合する官能基をあらかじめ結合させることにより、ゴムとシリカをより効果的に結合させることができる。
【００１６】
本発明の好ましい態様に従えば、ゴムと加硫可能なシランカップリング剤をシリカ配合量の０．５〜２０重量％配合して成るタイヤトレッド用ゴム組成物が提供される。
【００１７】
また、本発明の好ましい態様に従えば、前記ポリシロキサンをシリカ配合量の２〜２０重量％配合して成るタイヤトレッド用ゴム組成物が提供される。
【００１８】
更に、本発明の好ましい態様に従えば、前記ゴム組成物にジエチレングリコールをシリカ配合量の１〜１０重量％含むタイヤトレッド用ゴム組成物が提供される。
【００１９】
更に、本発明の好ましい態様に従えば、前記ゴム組成物を、加硫系を除いて１２０℃〜２００℃にて同時工程で混合したタイヤトレッド用ゴム組成物が提供される。
【００２０】
【発明の実施の形態】
以下、本発明の構成及び作用効果について詳しく説明する。
前述の如く、シリカを配合したタイヤトレッドの加硫物性は良好であるが、未加硫時の加工性に劣るという欠点があった。本発明者らの知見によれば、これはシリカ表面に存在するシラノール基（≡Ｓｉ−ＯＨ）に起因し、シラノール基の凝集力によりゴム組成物中で構造体が生成して粘度が上昇したり、シラノール基の極性により加硫促進剤などが吸着されて加硫が遅延したり、非極性ゴムとの相溶性が十分でないために混合のまとまりが低下したりする現象のために未加硫組成物の加工性が低下する。更に、シリカ配合ゴム組成物には、ゴムへの補強のために、シランカップリング剤が併用されることが多いが、シリカ粒子の内腔にもシラノール基が存在し、これがシランカップリング剤と反応してシランカップリング剤を損失させ、補強効果が低下するため多量のシランカップリング剤を配合しなければならないという問題があった。従来技術におけるように、これにジエチレングリコールなどの極性物質を更に配合すると、加硫促進剤などの極性配合剤が吸着される現象はある程度防止できるが、完全には防止できず、シランカップリング剤などのシリカ粒子と化学結合する物質が内腔に結合するのを防止することもできなかった。
【００２１】
本発明に従ってゴム組成物中に配合される前記式（ VI ）のアルコキシシランが縮合したポリシロキサンは、前述のごとくシラノール基と反応するアルコキシシリル基を有し、シラノール表面を覆って疎水性にする役割を果たす。従って、本発明において使用されるポリシロキサンにおいて、アルコキシシリル基および疎水基が必須であり、しかも、シロキサン単位としては２以上のものが５０重量％以上含まれることが好ましく、さらには平均重合度が５〜４０とするのが好ましい。疎水基としては前記式（ VI ）に示したメチルが原料的に入手可能であり、これらのアルコキシシランを６０重量％以上含有することが必要である。
【００２２】
かかるポリシロキサンの合成法は公知であり（伊藤邦雄編、シリコーンハンドブック、日刊工業新聞、P.163, 1990 年、Walter Noll, Chemistry and Technology of Silicones Academic Press, P.197, 1968、特開平６−２００３１号公報参照）、例えば前記式（ VI ）のアルコキシシランを酸、または塩基を触媒として加水分解、縮合することにより容易に合成される。１分子中に３つのアルコキシを有する場合（即ち、式（ VI ）においてｎ＝３）には、分子量を上げすぎると縮合中にゲル化する。また、ジアルコキシシランだけでは分子末端にのみにアルコキシシリル基がくるのでシリカとの反応の点で不利である。従って、トリアルコキシシランが１０重量％以上含有することが好ましい。共重合させるその他のアルコキシシラン、下記の表Ｉに掲げたようなものを４０重量％以下の範囲で使用しても良い。
【００２３】
【表１】
更に、シリカとゴムをより効果的に結合させるためには、表IIに示したシランカップリング剤を４０重量％以下、特に２０重量％以下の範囲で共重合させるのが好ましい。
以上のように合成したアルコキシシリル基含有ポリシロキサンはシリカ配合量の２〜２０重量％、好ましくは２〜８重量％である。配合量が少なすぎると、所望の効果が得られず、多すぎるとシリカと結合しない該物質が加硫物からしみだす場合があり好ましくない。
【００２５】
本発明において使用するジエン系ゴムとしては、従来から各種ゴム組成物に一般的に配合されている任意のジエン系ゴム、例えば天然ゴム（ＮＲ）、ポリイソプレンゴム（ＩＲ）、各種スチレン−ブタジエン共重合体ゴム（ＳＢＲ）、各種ポリブタジエンゴム（ＢＲ）、アクリロニトリル−ブタジエン共重合体ゴム（ＮＢＲ）、ブチルゴム（ＩＩＲ）などをあけることができる。これらのジエン系ゴムは単独又は任意のブレンドとして使用することができる。なお、これらのジエン系ゴムは、少量成分としてエチレン−プロピレン共重合体ゴム（ＥＰＲ，ＥＰＤＭ）などとブレンドして使用することもできる。
【００２６】
本発明の好ましい態様において使用されるシランカップリング剤としては代表的には下記表IIに示すものをあげることができる。
【００２７】
【表２】
本発明にかかる加硫可能なシランカップリング剤は、シリカ配合量の０．５〜２０重量％、好ましくは２〜８重量％である。配合量が少なすぎると、所望の効果が得られず、多すぎると混合や押し出しの工程で焼け（スコーチ）が生じやすくなり好ましくない。
【００２９】
上記ポリシロキサンは、ゴムとシリカを混合する工程で投入することが、その役割から考慮して好ましい。より好ましくは、上記ポリシロキサンはシランカップリング剤を投入すると同時、またはシランカップリング剤を投入する前に投入する。混練温度としては１２０℃〜２００℃、特に１４０℃〜１８０℃であることが好ましい、１２０℃よりも低い温度ではシリカのシラノールと上記ポリシロキサンの反応が遅く、加工性を改良することができない。また、２００℃以上では、焼けを生ずるので好ましくない。
【００３０】
【実施例】
以下、実施例、標準例及び比較例によって本発明を更に説明するが、本発明の範囲をこれらの実施例に限定するものでないことは言うまでもない。
【００３１】
以下の実施例及び比較例の各例の配合に用いた他の配合成分は以下の市販品を用いた。
天然ゴム（ＮＲ）：ＲＳＳ＃１
ＳＢＲ（ＮＳ１１６）：ニポールＮＳ１１６（日本ゼオン）
シリカ：ニプシルＡＱ（日本シリカ）
シランカップリング剤：Ｓｉ６９（デクサ）（化学名：ビス−〔３−（トリエトキシシリル）−プロピル〕テトラスルフィド）
【００３２】
粉末硫黄：５％油処理の粉末硫黄
老化防止剤６Ｃ：Ｎ−フェニル−Ｎ′−（１，３−ジメチルブチル）−ｐ−フェニレンジアミン
加硫促進剤ＣＺ：Ｎ−シクロヘキシル−２−ベンゾチアジルスルフェンアミド
加硫促進剤ＤＰＧ：ジフェニルグアニジン
酸化亜鉛：亜鉛華３号
ステアリン酸：工業用ステアリン酸
【００３３】
ポリシロキサン１〜３の合成
ポリシロキサン１〜３は、表IIIに示した含硫黄化合物を先ず水及び濃塩酸水溶液で加水分解し、次に表IIIに示したアルコキシシランを添加し、スズ触媒を用いて縮合した。
【００３４】
【表３】
サンプルの調製
加硫促進剤と硫黄を除く成分を１．８リットルの密閉型ミキサーで３〜５分間混練し、１６５±５℃に達したときに放出したマスターバッチに加硫促進剤と硫黄を８インチのオープンロール混練し、ゴム組成物を得た。２ステップ混合の場合、１ステップ目は１．８リットルの密閉型ミキサーで３〜４分間混練し、１５０±５℃に達した時に放出したマスターバッチを２ステップ目に残りの成分と共に１．８リットルの密閉型ミキサーで３〜５分間混練し、１６５±５℃に達した時に放出した２ステップ目のマスターバッチに加硫促進剤と硫黄を８インチのオープンロール混練し、ゴム組成物を得た。得られたゴム組成物の未加硫物性を測定した。
次に、この組成物を１５×１５×０．２cmの金型中で１６０℃で２０分間プレス加硫して目的とする試験片を調製し、加硫物性を評価した。
【００３６】
各例において得られた組成物の未加硫物性及び加硫物性の試験方法は以下の通りである。
未加硫物性
１）ミキサーでのまとまり：ミキサー放出時のマスターバッチのまとまりで評価した。（但し、２ステップの場合には２ステップ目マスターバッチの評価である。）
◎…一かたまりにまとまっており、ゴムに取りこまれていない粉がほとんどない状態。
○…一かたまりにまとまっているが、ゴムに取りこまれていない粉が散見される状態。
×…粉が付着している遊離したゴムの小片が見られる状態。
２）ムーニー粘度：ＪＩＳ Ｋ ６３００に基づき１００℃にて測定した。
３）加硫時間：ＪＩＳ Ｋ ６３００に基づき１６０℃にて９５％加硫度に達する時間を測定した。
４）スコーチ時間：ＪＩＳ Ｋ ６３００に基づき１２５℃にて粘度が５ポイント上昇する時間を測定した。
【００３７】
加硫物性
１）３００％変形応力、破断強度：ＪＩＳ Ｋ ６２５１（ダンベル状３号形）に準拠して測定
２）耐摩耗性：ランボーン型試験機で測定し、摩耗減量を指数表示
耐摩耗性（指数）＝〔（参照試験片（比較例１）での減量）／（各試験片での減量）〕×１００
結果は表IVに示す。
【００３８】
【表４】
【発明の効果】
以上の試験結果から明らかなように、本発明に従って特定の式（ VI ）のアルコキシシランを、硫黄含有シランカップリング剤と共加水分解、縮合して得られるポリシロキサンを配合することにより、表IVに示すように、未加硫ゴム組成物の加工性の改良ができ、追加のシランカップリング剤を使用しなくても、高い加硫物性が得られた。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber composition for a tire tread, and more particularly to a rubber composition for a vulcanizable silica compound tire tread having improved processability when unvulcanized. The rubber composition for tire treads of the present invention is useful for, for example, cap treads, side treads, and undertreads. Here, “silica” is hydrous silicic acid or anhydrous silicic acid, which has a nitrogen specific surface area of 50 to 300 m 2 / g used for rubber, and “vulcanization” Including cross-linking by sulfur or peroxide.
[0002]
[Prior art]
A rubber composition in which silica is blended with various rubbers is known. For example, it is used as a rubber composition for a tire tread having low heat build-up and excellent wear resistance. However, the tire tread compounded with silica has low rolling resistance and good wet road grip, but the viscosity of the unvulcanized compound increases, the vulcanization delay, the mixing mix decreases, and the productivity deteriorates. was there. In particular, when silica and carbon are simply mixed at the same time, the carbon and rubber are sufficiently contacted and reacted to promote sufficient mixing, but the silica is not sufficient, causing poor silica dispersion and sufficient silica properties. It was not alive. Various proposals have heretofore been made to solve this problem, but none of them are satisfactory in practice.
[0003]
For example, diethylene glycol or fatty acid is added (for example, see Rubber Industry Handbook <Fourth Edition>, pages 517 to 518, published in 1994), or a metal salt of carboxylic acid is added (for example, Tire Technology International 1995, 107 to 108). It has been proposed to treat silica with a silicone oil in advance (see, for example, JP-A-6-248116), but none of them is a practically sufficient method. Furthermore, there is no method other than taking a method such as increasing the number of times of mixing for the occurrence of scorch or mixing at the time of mixing, and also when mixing carbon and silica, mixing separately, Alternatively, the actual condition is that the mixing time and the number of times of mixing are increased.
[0004]
[Problems to be solved by the invention]
Therefore, the object of the present invention is to eliminate the above-mentioned problems of the prior art, without substantially impairing the characteristics of the silica-containing vulcanizable rubber composition, such as characteristics such as low heat buildup and wear resistance. An object of the present invention is to provide a rubber composition for a silica-containing vulcanizable tire tread having improved processability of the vulcanized rubber composition.
[0005]
[Means for Solving the Problems]
According to the present invention, 100 parts by weight of a diene rubber, 5 to 80 parts by weight of silica, and 60% by weight or more of an alkoxysilane represented by the following formula ( VI ) and 40% by weight or less of a sulfur-containing silane coupling agent are cohydrolyzed. A rubber composition for a tire tread comprising a polysiloxane obtained by condensation is provided.
[0012]
[Chemical 2]
(In the formula, Me represents a methyl group, R 2 represents a methyl group or an ethyl group, R 3 represents hydrogen or an alkyl group having 1 to 20 carbon atoms, n is an integer of 1 to 100, and m is 0 or an integer of 1 to 10.)
[0015]
According to the present invention, the rubber and the silica can be more effectively bonded to the polysiloxane not only by the alkoxysilyl group bonded to the silanol on the silica surface but also by the functional group chemically bonded to the rubber in advance. .
[0016]
According to a preferred embodiment of the present invention, there is provided a rubber composition for a tire tread comprising a rubber and a vulcanizable silane coupling agent blended in an amount of 0.5 to 20% by weight based on the amount of silica.
[0017]
Moreover, according to the preferable aspect of this invention, the rubber composition for tire treads which mix | blends the said polysiloxane 2 to 20weight% of a silica compounding quantity is provided.
[0018]
Furthermore, according to the preferable aspect of this invention, the rubber composition for tire treads which contains 1-10 weight% of diethylene glycol to the said rubber composition in the silica compounding quantity is provided.
[0019]
Furthermore, according to the preferable aspect of this invention, the rubber composition for tire treads which mixed the said rubber composition by the simultaneous process at 120 to 200 degreeC except the vulcanization system is provided.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration and operational effects of the present invention will be described in detail.
As described above, the tire tread compounded with silica has good vulcanized physical properties, but has the disadvantage of poor processability when unvulcanized. According to the knowledge of the present inventors, this is caused by silanol groups (≡Si—OH) present on the silica surface, and a structure is generated in the rubber composition due to the cohesive force of the silanol groups, resulting in an increase in viscosity. Or vulcanization accelerators are adsorbed due to the polarity of the silanol group, and the vulcanization is delayed, or because of poor compatibility with non-polar rubbers, the unmixed state is reduced. The processability of the composition is reduced. Furthermore, in the silica compounded rubber composition, a silane coupling agent is often used in combination for reinforcing the rubber, but silanol groups are also present in the inner cavities of the silica particles. There was a problem that a large amount of the silane coupling agent had to be blended because the silane coupling agent was lost by reaction and the reinforcing effect was lowered. As in the prior art, when a polar substance such as diethylene glycol is further added to this, the phenomenon that a polar compounding agent such as a vulcanization accelerator is adsorbed can be prevented to some extent, but cannot be completely prevented, such as a silane coupling agent. It was also impossible to prevent substances that chemically bond to the silica particles from binding to the lumen.
[0021]
The polysiloxane condensed with the alkoxysilane of the formula ( VI ) blended in the rubber composition according to the present invention has an alkoxysilyl group that reacts with the silanol group as described above, and covers the silanol surface to make it hydrophobic. Play a role. Accordingly, in the polysiloxane used in the present invention, an alkoxysilyl group and a hydrophobic group are essential, and it is preferable that 50% by weight or more of siloxane units are contained, and the average degree of polymerization is further increased. It is preferable to set it as 5-40. As the hydrophobic group, methyl represented by the formula ( VI ) is available as a raw material, and it is necessary to contain 60% by weight or more of these alkoxysilanes.
[0022]
Methods for synthesizing such polysiloxanes are known (Kunio Ito, Silicone Handbook, Nikkan Kogyo Shimbun, P.163, 1990, Walter Noll, Chemistry and Technology of Silicones Academic Press, P.197, 1968, JP-A-6- For example, it is easily synthesized by hydrolyzing and condensing the alkoxysilane of the formula ( VI ) using an acid or a base as a catalyst. When there are three alkoxy groups in one molecule (ie, n = 3 in the formula ( VI )), if the molecular weight is increased too much, gelation occurs during condensation. Further, dialkoxysilane alone is disadvantageous in terms of reaction with silica because an alkoxysilyl group is formed only at the molecular end. Accordingly, the trialkoxysilane is preferably contained in an amount of 10% by weight or more. Other alkoxysilanes to be copolymerized, such as those listed in Table I below, may be used in the range of 40% by weight or less.
[0023]
[Table 1]
Furthermore, in order to bind silica and rubber more effectively, it is preferable to copolymerize the silane coupling agent shown in Table II in a range of 40% by weight or less, particularly 20% by weight or less.
The alkoxysilyl group-containing polysiloxane synthesized as described above is 2 to 20% by weight, preferably 2 to 8% by weight, based on the amount of silica. If the amount is too small, the desired effect cannot be obtained, and if it is too large, the substance that does not bind to silica may ooze out from the vulcanizate.
[0025]
Examples of the diene rubber used in the present invention include any diene rubber generally blended in various rubber compositions, such as natural rubber (NR), polyisoprene rubber (IR), and various styrene-butadiene copolymers. Polymer rubber (SBR), various polybutadiene rubbers (BR), acrylonitrile-butadiene copolymer rubber (NBR), butyl rubber (IIR) and the like can be opened. These diene rubbers can be used alone or as any blend. These diene rubbers can be blended with ethylene-propylene copolymer rubber (EPR, EPDM) or the like as a minor component.
[0026]
Typical examples of the silane coupling agent used in the preferred embodiment of the present invention include those shown in Table II below.
[0027]
[Table 2]
The vulcanizable silane coupling agent according to the present invention is 0.5 to 20% by weight, preferably 2 to 8% by weight, based on the amount of silica. If the amount is too small, the desired effect cannot be obtained, and if it is too large, burning (scorch) tends to occur in the mixing and extrusion process, which is not preferable.
[0029]
The polysiloxane is preferably introduced in the process of mixing rubber and silica in view of its role. More preferably, the polysiloxane is added simultaneously with the introduction of the silane coupling agent or before the introduction of the silane coupling agent. The kneading temperature is preferably 120 ° C. to 200 ° C., and particularly preferably 140 ° C. to 180 ° C. If the temperature is lower than 120 ° C., the reaction between the silanol of silica and the polysiloxane is slow, and the processability cannot be improved. Further, if it is 200 ° C. or higher, it is not preferable because it causes burning.
[0030]
【Example】
Hereinafter, although an example, a standard example, and a comparative example explain the present invention further, it cannot be overemphasized that the scope of the present invention is not limited to these examples.
[0031]
The following commercial item was used for the other compounding component used for the compounding of each example of the following examples and comparative examples.
Natural rubber (NR): RSS # 1
SBR (NS116): Nipol NS116 (Nippon Zeon)
Silica: Nipsil AQ (Nippon Silica)
Silane coupling agent: Si69 (dexa) (chemical name: bis- [3- (triethoxysilyl) -propyl] tetrasulfide)
[0032]
Powdered sulfur: Powdered sulfur anti-aging agent treated with 5% oil 6C: N-phenyl-N '-(1,3-dimethylbutyl) -p-phenylenediamine vulcanization accelerator CZ: N-cyclohexyl-2-benzothiazyl Sulfenamide vulcanization accelerator DPG: Diphenylguanidine zinc oxide: Zinc Hua 3 Stearic acid: Industrial stearic acid
Synthesis of polysiloxane 1-3
Polysiloxanes 1 to 3 were obtained by first hydrolyzing the sulfur-containing compounds shown in Table III with water and a concentrated aqueous hydrochloric acid solution, then adding the alkoxysilane shown in Table III and condensing using a tin catalyst.
[0034]
[Table 3]
Sample preparation Vulcanization accelerator and sulfur were kneaded for 3 to 5 minutes in a 1.8 liter closed mixer, and when the temperature reached 165 ± 5 ° C, the vulcanization accelerator and sulfur were added to the master batch. An 8-inch open roll was kneaded to obtain a rubber composition. In the case of two-step mixing, the first step is kneaded for 3 to 4 minutes with a 1.8 liter closed mixer, and the master batch released when the temperature reaches 150 ± 5 ° C. is added to the second step together with the remaining components. A rubber composition is obtained by kneading for 3 to 5 minutes with a liter closed mixer and kneading the vulcanization accelerator and sulfur into an 8 inch open roll into the second step master batch released when the temperature reaches 165 ± 5 ° C. It was. The unvulcanized physical properties of the obtained rubber composition were measured.
Next, this composition was press vulcanized at 160 ° C. for 20 minutes in a 15 × 15 × 0.2 cm mold to prepare a target test piece, and vulcanized physical properties were evaluated.
[0036]
The test methods for the unvulcanized physical properties and the vulcanized physical properties of the compositions obtained in each example are as follows.
Unvulcanized physical properties 1) Batch by mixer: Evaluation was made by batch of master batch at the time of mixer discharge. (However, in the case of 2 steps, it is the evaluation of the second step master batch.)
◎… A state in which there is almost no powder that has been collected in a lump and is not incorporated in rubber.
○ ... A state where powders that are gathered in a lump but are not incorporated in rubber are scattered.
X: State in which small pieces of loose rubber with powder attached are seen.
2) Mooney viscosity: measured at 100 ° C. based on JIS K 6300.
3) Vulcanization time: Based on JIS K 6300, the time to reach 95% vulcanization degree at 160 ° C. was measured.
4) Scorch time: Based on JIS K 6300, the time for the viscosity to rise by 5 points at 125 ° C. was measured.
[0037]
Vulcanized physical properties 1) 300% deformation stress, rupture strength: measured in accordance with JIS K 6251 (dumbbell shape No. 3) 2) Abrasion resistance: measured with a lambone type tester, wear loss is indicated by index (Index) = [(weight loss with reference specimen (Comparative Example 1)) / (weight loss with each specimen)] × 100
The results are shown in Table IV.
[0038]
[Table 4]
【The invention's effect】
As is clear from the above test results, by blending a polysiloxane obtained by cohydrolyzing and condensing an alkoxysilane of the specific formula ( VI ) with a sulfur-containing silane coupling agent according to the present invention, Table IV As shown in FIG. 5, the processability of the unvulcanized rubber composition can be improved, and high vulcanized physical properties can be obtained without using an additional silane coupling agent.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP01573598A JP4036519B2 (en) | 1997-01-29 | 1998-01-28 | Rubber composition for tire tread with improved processability |
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| JP9-15477 | 1997-01-29 | ||
| JP1547797 | 1997-01-29 | ||
| JP01573598A JP4036519B2 (en) | 1997-01-29 | 1998-01-28 | Rubber composition for tire tread with improved processability |
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| JPH10273559A JPH10273559A (en) | 1998-10-13 |
| JP4036519B2 true JP4036519B2 (en) | 2008-01-23 |
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| WO2014002750A1 (en) * | 2012-06-27 | 2014-01-03 | 横浜ゴム株式会社 | Tire tread rubber composition and pneumatic tire |
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