JPH09278944A - Rubber composition having high hysteresis loss - Google Patents
Rubber composition having high hysteresis lossInfo
- Publication number
- JPH09278944A JPH09278944A JP8086924A JP8692496A JPH09278944A JP H09278944 A JPH09278944 A JP H09278944A JP 8086924 A JP8086924 A JP 8086924A JP 8692496 A JP8692496 A JP 8692496A JP H09278944 A JPH09278944 A JP H09278944A
- Authority
- JP
- Japan
- Prior art keywords
- molecular weight
- rubber
- hysteresis loss
- rubber composition
- low molecular
- 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
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、剛性およびヒステ
リシスロスを高めたゴム組成物に関する。TECHNICAL FIELD The present invention relates to a rubber composition having improved rigidity and hysteresis loss.
【０００２】[0002]
【従来の技術】ヒステリシスロスの高いゴム組成物をタ
イヤのトレッド部に配すると、タイヤのグリップ力（路
面把握力）を高めることができる。グリップ力の高いタ
イヤは高速走行用として好適である。従来、トレッド部
のヒステリシスロスを高めてグリップ力を向上させるた
めに、トレッド部を軟らかいゴム組成物で構成してトレ
ッド部を変形し易くし、路面からの圧力をトレッド部内
部で熱エネルギーに変えてしまうことが試みられてい
た。しかし、トレッド部を変形し易くするとトレッド剛
性が低下するので操縦安定性が悪くなるという問題があ
った。2. Description of the Related Art When a rubber composition having a high hysteresis loss is arranged in the tread portion of a tire, the grip force (road surface gripping force) of the tire can be increased. A tire having a high grip is suitable for high-speed running. Conventionally, in order to increase the hysteresis loss of the tread portion and improve the gripping force, the tread portion is made of a soft rubber composition to facilitate the deformation of the tread portion, and the pressure from the road surface is converted into heat energy inside the tread portion. It was being attempted to end up. However, when the tread portion is easily deformed, the tread rigidity is lowered, and thus there is a problem that steering stability is deteriorated.
【０００３】そこで、剛性を犠牲とせずにヒステリシス
ロスを高める技術が種々提案されたが（特開昭61-20314
5 号公報、特開昭64-14258号公報、特開平1-197541号公
報)、近年における車両の走行速度の向上にかんがみ、
これらの技術では不十分であった。このため、さらに高
ヒステリシスロスで高剛性のゴム組成物が要望されてい
る。Therefore, various techniques have been proposed for increasing hysteresis loss without sacrificing rigidity (Japanese Patent Laid-Open No. 61-20314).
No. 5, JP-A-64-14258, JP-A-1-197541), in view of improving the traveling speed of the vehicle in recent years,
These techniques were insufficient. Therefore, there is a demand for a rubber composition having higher hysteresis loss and higher rigidity.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は、剛性
（300%モジュラス) およびヒステリシスロス（tan δ)
を向上させた高ヒステリシスロスゴム組成物を提供する
ことである。このゴム組成物は、タイヤトレッド用とし
て好適である。SUMMARY OF THE INVENTION It is an object of the present invention to provide stiffness (300% modulus) and hysteresis loss (tan δ).
It is to provide a high hysteresis loss rubber composition having improved rubber composition. This rubber composition is suitable for tire treads.
【０００５】[0005]
【課題を解決するための手段】本発明のゴム組成物は、
主鎖を形成する全結合炭素数に対する主鎖中の不飽和結
合数の割合が０〜８％であって重量平均分子量が2,000
〜100,000 の低分子量重合体を、ジエン系ゴム100 重量
部に対し５〜50重量部配合してなることを特徴とする。
このように、特定の低分子量重合体を用いるために、上
記目的の達成が可能となる。Means for Solving the Problems The rubber composition of the present invention comprises:
The ratio of the number of unsaturated bonds in the main chain to the total number of carbon atoms forming the main chain is 0 to 8%, and the weight average molecular weight is 2,000.
It is characterized in that 5 to 50 parts by weight of a low molecular weight polymer of -100,000 is blended with 100 parts by weight of a diene rubber.
Thus, the use of the specific low molecular weight polymer makes it possible to achieve the above-mentioned object.
【０００６】[0006]
【発明の実施の形態】 ジエン系ゴム 特に限定されるものではなく、一般のジエン系ゴムであ
ればよい。例えば、スチレン−ブタジエン共重合体ゴ
ム、ブタジエンゴム、イソプレンゴム、ニトリル−ブタ
ジエン共重合体ゴムなどである。BEST MODE FOR CARRYING OUT THE INVENTION Diene rubber is not particularly limited, and any general diene rubber may be used. For example, styrene-butadiene copolymer rubber, butadiene rubber, isoprene rubber, nitrile-butadiene copolymer rubber and the like.
【０００７】このうち、特に、ガラス転移温度（Ｔｇ）
が高く（−40℃〜＋20℃）、分子量の高い（500,000 〜
2,000,000）ジエン系ゴムが用いられる。 低分子量重合体 主鎖を形成する全結合炭素数に対する主鎖中の不飽和結
合数の割合が０〜８％であって重量平均分子量が2,000
〜100,000 のものである。Of these, especially the glass transition temperature (Tg)
Is high (-40 to + 20 ° C), and the molecular weight is high (500,000 to
2,000,000) Diene rubber is used. Low molecular weight polymer The ratio of the number of unsaturated bonds in the main chain to the total number of carbon atoms forming the main chain is 0 to 8%, and the weight average molecular weight is 2,000.
~ 100,000.
【０００８】二重結合をもった低分子量重合体は、高分
子量のジエン系ゴムと同様に、加硫反応を起こす。低分
子量重合体は、分子鎖が短いため有効な網目鎖を作り難
く剛性を低下させる原因となる。検討の結果、主鎖を形
成する全結合炭素数に対する主鎖中の不飽和結合数の割
合が８％である低分子量重合体を配合すると、等量のア
ロマティックオイルを配合した場合と同程度の剛性のコ
ンパウンドが得られ、８％以下であればそれ以上の剛性
のコンパウンドが得られることがわかった。A low molecular weight polymer having a double bond causes a vulcanization reaction, like a high molecular weight diene rubber. Since the low molecular weight polymer has a short molecular chain, it is difficult to form an effective network chain, which causes a decrease in rigidity. As a result of investigation, when a low molecular weight polymer in which the ratio of the number of unsaturated bonds in the main chain to the total number of bonded carbon atoms forming the main chain is 8% is added, it is almost the same as when an equal amount of aromatic oil is added. It was found that a compound having a rigidity of 8% was obtained, and a compound having a rigidity higher than 8% was obtained.
【０００９】また、ヒステリシスロス向上のためには、
低分子量重合体の重量平均分子量が2,000 〜100,000 の
範囲であるのがよい。分子量が2,000 未満では、粘度の
低下が大きく、コンパウンドの強度を低下させる。100,
000 超では、ヒステリシスロス向上効果が十分でない。
そこで、本発明では、用いる低分子量重合体につき“主
鎖を形成する全結合炭素数に対する主鎖中の不飽和結合
数の割合が０〜８％”とすると共に、“重量平均分子量
2,000 〜100,000 ”としたのである。このような低分子
量重合体としては、例えば、スチレン−ブタジエン共重
合体ゴム、高ビニルブタジエンゴム、3,4-イソプレンゴ
ム、イソブチレン−イソプレンゴム、ハロゲン化イソブ
チレン−イソプレンゴム、エチレン−プロピレン−ジエ
ン系共重合体、水素添加アクリロニトリル−ブタジエン
共重合体、水素添加スチレン−ブタジエン共重合体、ポ
リブテンが挙げられる。To improve the hysteresis loss,
The weight average molecular weight of the low molecular weight polymer is preferably in the range of 2,000 to 100,000. When the molecular weight is less than 2,000, the viscosity is largely reduced, and the compound strength is reduced. 100,
If it exceeds 000, the effect of improving hysteresis loss is not sufficient.
Therefore, in the present invention, the ratio of the number of unsaturated bonds in the main chain to the total number of bonded carbon atoms forming the main chain is 0 to 8% for the low molecular weight polymer to be used, and the "weight average molecular weight" is set.
2,000 to 100,000 ". Examples of such a low molecular weight polymer include styrene-butadiene copolymer rubber, high vinyl butadiene rubber, 3,4-isoprene rubber, isobutylene-isoprene rubber and halogenated isobutylene- Examples include isoprene rubber, ethylene-propylene-diene copolymer, hydrogenated acrylonitrile-butadiene copolymer, hydrogenated styrene-butadiene copolymer, and polybutene.
【００１０】さらに、この低分子量重合体は、“片末端
あるいは両末端に、ビニル芳香族化合物を５〜18個結合
させたもの”であるのが好ましい。剛性の向上、ヒステ
リシスロスの向上がいっそう大きくなるからである。ビ
ニル芳香族化合物が５個未満ではこのような効果が発現
せず、一方、18個超ではコンパウンドが樹脂状となりコ
ンパウンド硬度を上昇させるため好ましくない。Further, the low molecular weight polymer is preferably "a polymer in which 5 to 18 vinyl aromatic compounds are bonded to one end or both ends". This is because the improvement in rigidity and the improvement in hysteresis loss are even greater. If the number of vinyl aromatic compounds is less than 5, such an effect will not be exhibited. On the other hand, if the amount of vinyl aromatic compounds exceeds 18, the compound becomes a resin and the compound hardness is increased, which is not preferable.
【００１１】ビニル芳香族化合物としては、例えば、ス
チレン、ｐ−メチルスチレン、ｍ−メチルスチレン、ｐ
−ｔｅｒｔブチルスチレン、クロロメチルスチレンなど
である。スチレン、ｐ−メチルスチレンが好ましい。 本発明の高ヒステリシスロスゴム組成物は、前記ジ
エン系ゴム100 重量部に対し前記低分子量重合体を５〜
50重量部配合してなる。Examples of vinyl aromatic compounds include styrene, p-methylstyrene, m-methylstyrene and p-methylstyrene.
-Tert butyl styrene, chloromethyl styrene and the like. Styrene and p-methylstyrene are preferred. The high hysteresis loss rubber composition of the present invention comprises 5 parts by weight of the low molecular weight polymer based on 100 parts by weight of the diene rubber.
It contains 50 parts by weight.
【００１２】５重量部未満では少な過ぎて配合する効果
を発揮できず、一方、50重量部を超えると剛性の低下が
著しくなるからである。このゴム組成物は、さらに、カ
ーボンブラック、老化防止剤、アロマティックオイル等
の種々の配合剤を必要に応じて含有することができる。
なお、Ｎ2ＳＡ（窒素吸着比表面積）が120 m2/g以上で
ＤＢＰ吸油量が100ml/100g以上のカーボンブラック（Ｓ
ＡＦクラス以上のもの）を前記ジエン系ゴム100 重量部
に対し50〜160 重量部配合するか、又はこれに加えてア
ロマティックオイルを20〜150 重量部配合したものを、
タイヤトレッド用とするのがいっそうよい。This is because if the amount is less than 5 parts by weight, the effect of blending is too small to exert the effect, and if the amount exceeds 50 parts by weight, the rigidity is remarkably lowered. The rubber composition may further contain various compounding agents such as carbon black, an antioxidant and an aromatic oil, if necessary.
Incidentally, N 2 SA (nitrogen adsorption specific surface area) of 120 m 2 / g or more DBP oil absorption of 100 ml / 100 g or more carbon black (S
AF class or above) is blended in an amount of 50 to 160 parts by weight with respect to 100 parts by weight of the diene rubber, or in addition thereto, a blend of 20 to 150 parts by weight of an aromatic oil.
Even better for tire treads.
【００１３】[0013]
【実施例】表１に示す分子量およびビニル芳香族ブロッ
クを持った低分子量重合体を表２に示す配合処方により
配合して、本発明ゴム組成物（実施例１）および本発明
範囲外の比較ゴム組成物（比較例１〜５）とし、これら
の加硫物の剛性（300%モジュラス) およびヒステリシス
ロス（tan δ(60 ℃))を評価した。この結果を表３に示
す。EXAMPLE A low molecular weight polymer having a molecular weight and a vinyl aromatic block shown in Table 1 was blended according to the compounding formulation shown in Table 2 to compare the rubber composition of the present invention (Example 1) with those outside the scope of the present invention. The rubber compositions (Comparative Examples 1 to 5) were evaluated for rigidity (300% modulus) and hysteresis loss (tan δ (60 ° C)) of these vulcanized products. Table 3 shows the results.
【００１４】この場合、tan δは、周波数20Hz、初期歪
10% 、振幅±２％の条件で測定した。tan δ(60 ℃) の
値が高いほど高ヒステリシスロスといえる。ＪＩＳ硬度
は、JIS K 6301にしたがって測定した。In this case, tan δ is a frequency of 20 Hz, initial distortion
It was measured under the conditions of 10% and amplitude ± 2%. It can be said that the higher the value of tan δ (60 ° C), the higher the hysteresis loss. The JIS hardness was measured according to JIS K 6301.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【表３】 [Table 3]
【００１８】比較例２と比較例３の比較から、スチレン
ブロックはtan δ(60 ℃) を上昇させ、300%モジュラス
は殆ど上昇させないことがわかる。また、実施例１は、
比較例１に対し、tan δ(60 ℃) 、300%モジュラスとも
に上昇しており、このことはスチレンブロックによりta
n δ(60 ℃) が上昇し、主鎖中の不飽和結合量が少ない
ことにより300%モジュラスが上昇したものと考えられ
る。実施例１は、比較例１とほぼ同硬度であるが、比較
例２では硬度が大きく上昇しており、このことにより芳
香族ブロックの個数が多いと硬度が上昇し、タイヤトレ
ッドに使用するには好ましくないことがわかる。また、
比較例４、５のように低分子量重合体の配合量が本発明
の範囲外では、十分なtan δ(60 ℃) 上昇の効果が得ら
れない。したがって、本発明によれば、硬度を維持しつ
つ、ヒステリシスロスが高く、高い剛性のゴム組成物が
得られる。From the comparison of Comparative Example 2 and Comparative Example 3, it can be seen that the styrene block raises tan δ (60 ° C.) and the 300% modulus hardly rises. Example 1
Compared to Comparative Example 1, both tan δ (60 ° C) and 300% modulus increased, which means that styrene block caused ta
It is considered that the n% (60 ° C) increased and the amount of unsaturated bond in the main chain was small, so that the 300% modulus increased. The hardness of Example 1 is almost the same as that of Comparative Example 1, but the hardness is significantly increased in Comparative Example 2, which increases the hardness when the number of aromatic blocks is large, and makes it suitable for use in a tire tread. It turns out that is not preferable. Also,
When the blending amount of the low molecular weight polymer is outside the range of the present invention as in Comparative Examples 4 and 5, a sufficient effect of increasing tan δ (60 ° C.) cannot be obtained. Therefore, according to the present invention, it is possible to obtain a rubber composition having high hysteresis loss and high rigidity while maintaining hardness.
【００１９】[0019]
【発明の効果】以上説明したように本発明によれば、主
鎖を形成する全結合炭素数に対する主鎖中の不飽和結合
数の割合が０〜８％であって重量平均分子量が2,000 〜
100,000 の低分子量重合体を、ジエン系ゴム100 重量部
に対し５〜50重量部配合したために、剛性およびヒステ
リシスロスを高めることが可能となる。As described above, according to the present invention, the ratio of the number of unsaturated bonds in the main chain to the total number of carbon atoms forming the main chain is 0 to 8%, and the weight average molecular weight is 2,000 to 2,000.
Since 100,000 low molecular weight polymer is blended in an amount of 5 to 50 parts by weight based on 100 parts by weight of the diene rubber, rigidity and hysteresis loss can be increased.
───────────────────────────────────────────────────── 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 57:04） (Ｃ０８Ｌ 9/00 25:00） (72)発明者 島田 淳 神奈川県平塚市追分２番１号 横浜ゴム株 式会社平塚製造所内 (72)発明者 鈴木 文敏 神奈川県川崎市川崎区夜光１−２−１ 日 本ゼオン株式会社総合開発センター内 (72)発明者 中村 昌生 神奈川県川崎市川崎区夜光１−２−１ 日 本ゼオン株式会社総合開発センター内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location // (C08L 9/00 57:04) (C08L 9/00 25:00) (72) Inventor Atsushi Shimada 2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Co., Ltd. Hiratsuka Plant (72) Inventor, Fumitoshi Suzuki 1-2-1, Kawasaki-ku, Kawasaki-shi, Kanagawa Nihon Zeon Corporation R & D Center (72) Inventor Masao Nakamura 1-2-1 Yokou, Kawasaki-ku, Kawasaki-shi, Kanagawa Nihon Zeon Corporation R & D Center
Claims (6)
鎖中の不飽和結合数の割合が０〜８％であって重量平均
分子量が2,000 〜100,000 の低分子量重合体を、ジエン
系ゴム100 重量部に対し５〜50重量部配合してなる高ヒ
ステリシスロスゴム組成物。1. A low molecular weight polymer having a ratio of the number of unsaturated bonds in the main chain to the total number of bonded carbon atoms forming the main chain of 0 to 8% and a weight average molecular weight of 2,000 to 100,000 and a diene rubber. A high hysteresis loss rubber composition containing 5 to 50 parts by weight per 100 parts by weight.
両末端に、ビニル芳香族化合物を５〜18個結合させたも
のである請求項１記載の高ヒステリシスロスゴム組成
物。2. The high hysteresis loss rubber composition according to claim 1, wherein the low molecular weight polymer has 5 to 18 vinyl aromatic compounds bonded to one end or both ends thereof.
る請求項２記載の高ヒステリシスロスゴム組成物。3. The high hysteresis loss rubber composition according to claim 2, wherein the vinyl aromatic compound is styrene.
エン共重合体ゴムである請求項１乃至３のいずれか１項
に記載の高ヒステリシスロスゴム組成物。4. The high hysteresis loss rubber composition according to claim 1, wherein the low molecular weight polymer is a styrene-butadiene copolymer rubber.
ン共重合体ゴムである請求項１記載の高ヒステリシスロ
スゴム組成物。5. The high hysteresis loss rubber composition according to claim 1, wherein the diene rubber is a styrene-butadiene copolymer rubber.
形成する全結合炭素数に対する主鎖中の不飽和結合数の
割合が０〜８％であって重量平均分子量が2,000 〜100,
000 の低分子量重合体を５〜50重量部配合すると共に、
Ｎ2ＳＡが120m2/g以上でＤＢＰ吸油量が100ml/100g以上
のカーボンブラックを50〜160 重量部配合したタイヤト
レッド用ゴム組成物。6. The ratio of the number of unsaturated bonds in the main chain to the total number of carbon atoms forming the main chain is 0 to 8%, and the weight average molecular weight is 2,000 to 100, based on 100 parts by weight of the diene rubber.
5 to 50 parts by weight of low molecular weight polymer of 000 is blended,
A rubber composition for a tire tread containing 50 to 160 parts by weight of carbon black having N 2 SA of 120 m 2 / g or more and DBP oil absorption of 100 ml / 100 g or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8086924A JPH09278944A (en) | 1996-04-09 | 1996-04-09 | Rubber composition having high hysteresis loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8086924A JPH09278944A (en) | 1996-04-09 | 1996-04-09 | Rubber composition having high hysteresis loss |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09278944A true JPH09278944A (en) | 1997-10-28 |
Family
ID=13900420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8086924A Pending JPH09278944A (en) | 1996-04-09 | 1996-04-09 | Rubber composition having high hysteresis loss |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09278944A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005225946A (en) * | 2004-02-12 | 2005-08-25 | Sumitomo Rubber Ind Ltd | Rubber composition and tire using the same |
| JP2006213809A (en) * | 2005-02-03 | 2006-08-17 | Bridgestone Corp | Rubber composition and pneumatic tire using the same |
| JP2006213807A (en) * | 2005-02-03 | 2006-08-17 | Bridgestone Corp | Rubber composition and pneumatic tire using the same |
| JP2006257160A (en) * | 2005-03-15 | 2006-09-28 | Yokohama Rubber Co Ltd:The | Rubber composition for tire tread |
| JP2007137941A (en) * | 2005-11-15 | 2007-06-07 | Sumitomo Rubber Ind Ltd | Rubber composition and high performance tire using the same |
| JP2007161817A (en) * | 2005-12-12 | 2007-06-28 | Sumitomo Rubber Ind Ltd | Rubber composition for tire |
| US7304109B2 (en) | 2004-07-02 | 2007-12-04 | Sumitomo Rubber Industries, Ltd. | Rubber composition and tire using the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02147646A (en) * | 1988-11-29 | 1990-06-06 | Bridgestone Corp | Rubber composition |
-
1996
- 1996-04-09 JP JP8086924A patent/JPH09278944A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02147646A (en) * | 1988-11-29 | 1990-06-06 | Bridgestone Corp | Rubber composition |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005225946A (en) * | 2004-02-12 | 2005-08-25 | Sumitomo Rubber Ind Ltd | Rubber composition and tire using the same |
| US7304109B2 (en) | 2004-07-02 | 2007-12-04 | Sumitomo Rubber Industries, Ltd. | Rubber composition and tire using the same |
| JP2006213809A (en) * | 2005-02-03 | 2006-08-17 | Bridgestone Corp | Rubber composition and pneumatic tire using the same |
| JP2006213807A (en) * | 2005-02-03 | 2006-08-17 | Bridgestone Corp | Rubber composition and pneumatic tire using the same |
| JP2006257160A (en) * | 2005-03-15 | 2006-09-28 | Yokohama Rubber Co Ltd:The | Rubber composition for tire tread |
| JP2007137941A (en) * | 2005-11-15 | 2007-06-07 | Sumitomo Rubber Ind Ltd | Rubber composition and high performance tire using the same |
| JP2007161817A (en) * | 2005-12-12 | 2007-06-28 | Sumitomo Rubber Ind Ltd | Rubber composition for tire |
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