JPH11279332A - Rubber composition for studless tire - Google Patents

Rubber composition for studless tire

Info

Publication number
JPH11279332A
JPH11279332A JP10077791A JP7779198A JPH11279332A JP H11279332 A JPH11279332 A JP H11279332A JP 10077791 A JP10077791 A JP 10077791A JP 7779198 A JP7779198 A JP 7779198A JP H11279332 A JPH11279332 A JP H11279332A
Authority
JP
Japan
Prior art keywords
rubber
linty
agglomerates
studless tire
tire
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
Application number
JP10077791A
Other languages
Japanese (ja)
Inventor
Yoichi Yamaguchi
洋一 山口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP10077791A priority Critical patent/JPH11279332A/en
Publication of JPH11279332A publication Critical patent/JPH11279332A/en
Pending legal-status Critical Current

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  • Tires In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a rubber composition which can give a studless tire exhibiting improved friction performance on ice even when the tire is new by incorporating a diene rubber with linty agglomerates of a hard rubbery elastomer. SOLUTION: Linty cuttings obtained by continuously cutting with, e.g. a lathe a hard rubbery elastomer, such as a urethane rubber or an acrylonitrile/ butadiene rubber, having a hardness A of at least 70 at room temperature are agglomerated by curling to obtain linty elastomeric agglomerates having a bulk density (JIS K-6220) of 0.3-0.8. 100 pts.wt. diene rubber having a glass transition temperature of -55 deg.C or below on the average and selected among natural rubbers, polyisoprene rubbers, styrene/butadiene copolymer rubbers, butadiene rubbers, and blends thereof is incorporated with 1-20 pts.wt., desirably, 3-10 pts.wt. linty elastomeric agglomerates. The thus obtained composition can give a studless tire with an irregular-surfaced tread where protrusions each comprising an agglomerate and a matrix rubber are formed, and upon being abraded the agglomerates are separated from the matrix rubber to leave recesses therein.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、スタッドレスタイ
ヤ用ゴム組成物に関し、更に詳しくは、新品時において
も優れた氷上摩擦性能を有するスタッドレスタイヤ用ゴ
ム組成物に関する。
The present invention relates to a rubber composition for a studless tire, and more particularly, to a rubber composition for a studless tire having excellent friction performance on ice even when new.

【0002】[0002]

【従来の技術】スタッドレスタイヤ用トレッドゴム材料
としてそのトレッドゴム表面に凹凸を形成するために、
硬質あるいは軟質物質を配合したものが従来より公知で
ある。例えば、特開平4−117439号公報には、ト
レッドゴムに炭素質粉体(炭素質メソフェーズ小球体)
を配合して表面に凹凸を形成することが、また、特開平
5−310007号公報には、活性炭などにオイルを含
浸したものをトレッドゴムに配合して、ゴム硬質の経時
変化を抑制することが、また、特開平6−256575
号公報には、トレッドゴム中に粉末加硫ゴムを配合する
ことが開示されている。しかしながら、これらの配合物
を含むタイヤのモールド面は滑らかであり、摩耗して始
めて表面凹凸が形成されるため、新品タイヤの氷上摩擦
による初期性能まで同一の手法で改良することは困難で
ある。
2. Description of the Related Art As a tread rubber material for a studless tire, in order to form irregularities on the surface of the tread rubber,
Compounds containing a hard or soft substance have been conventionally known. For example, Japanese Unexamined Patent Publication (Kokai) No. 4-117439 discloses that a carbonaceous powder (carbonaceous mesophase small sphere) is added to a tread rubber.
And Japanese Unexamined Patent Publication (Kokai) No. 5-310007 discloses that activated carbon or the like impregnated with oil is mixed into tread rubber to suppress the change of rubber hardness with time. However, Japanese Patent Application Laid-Open No. 6-256575
Japanese Patent Application Laid-Open Publication No. H11-157, discloses that powdered vulcanized rubber is compounded in tread rubber. However, since the mold surface of the tire containing these compounds is smooth and the surface unevenness is formed only when worn, it is difficult to improve the initial performance of a new tire by friction on ice by the same method.

【0003】[0003]

【発明が解決しようとする課題】従って、本発明では、
新品時から所望のスタッドレスタイヤの氷路上の摩擦力
を高めるように改良したスタッドレスタイヤ用ゴム組成
物を提供することを目的とする。
Therefore, in the present invention,
It is an object of the present invention to provide a rubber composition for a studless tire that has been improved so as to increase the frictional force of a desired studless tire on an icy road even when new.

【0004】[0004]

【課題を解決するための手段】本発明によれば、ジエン
系ゴム100重量部に対し、硬質ゴム状弾性体の糸屑状
凝集塊を1〜20重量部配合してなるスタッドレスタイ
ヤ用ゴム組成物が提供される。
According to the present invention, a rubber composition for a studless tire is prepared by mixing 1 to 20 parts by weight of a lump-like aggregate of a hard rubber-like elastic material with 100 parts by weight of a diene rubber. Things are provided.

【0005】また、本発明によれば、前記硬質ゴム状弾
性体が室温のJIS A硬度で70以上であり、その糸
屑状凝集塊の嵩比重が0.3〜0.8である前記スタッ
ドレスタイヤ用ゴム組成物が提供される。
Further, according to the present invention, the studless material wherein the hard rubber-like elastic body has a JIS A hardness of 70 or more at room temperature and the lump-like aggregate has a bulk specific gravity of 0.3 to 0.8. A rubber composition for a tire is provided.

【0006】また、本発明によれば、前記ジエン系ゴム
の平均ガラス転移温度が−55℃以下である前記スタッ
ドレスタイヤ用ゴム組成物が提供される。
Further, according to the present invention, there is provided the rubber composition for a studless tire, wherein the average glass transition temperature of the diene rubber is -55 ° C. or less.

【0007】[0007]

【発明の実施の形態】本発明に従えば、硬質ゴム状弾性
体を旋盤などで連続的に切削することにより発生する糸
屑状の凝集塊を、スタッドレス用トレッドゴムコンパウ
ンドに配合することで、加硫ゴムのタイヤモールド面に
当該糸屑状凝集塊による凸部が形成される。また、この
加硫ゴムを摩耗させると、凝集塊がマトリックスゴムか
ら脱落することで凹部が形成される。これにより、加硫
直後からトレッド表面に凹凸をもつスタッドレスタイヤ
を得ることができる。
According to the present invention, a lint-like agglomerate generated by continuously cutting a hard rubber-like elastic body with a lathe or the like is blended into a tread rubber compound for studless. A projection is formed on the tire mold surface of the vulcanized rubber by the lint-like aggregate. Also, when the vulcanized rubber is worn, the aggregates fall off from the matrix rubber to form recesses. As a result, a studless tire having irregularities on the tread surface can be obtained immediately after vulcanization.

【0008】本発明に用いられるジエン系ゴムとして
は、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(S
BR)、各種ポリブタジエン(BR)等、あるいはこれ
らのブレンドを挙げることができ、特にその低転動抵抗
と耐摩耗性、低温性能を両立させて向上するために、ガ
ラス転移温度(Tg)が平均値で−55℃以下のものを
使用することが好ましい。
Examples of the diene rubber used in the present invention include natural rubber (NR), polyisoprene rubber (IR), and various styrene-butadiene copolymer rubbers (S
BR), various polybutadienes (BR) and the like, and blends thereof. Particularly, in order to improve the low rolling resistance, the abrasion resistance and the low temperature performance at the same time, the glass transition temperature (Tg) is averaged. It is preferable to use one having a value of -55 ° C or less.

【0009】本発明によれば、前記ジエン系ゴム100
重量部に対し、硬質ゴム状弾性体の糸屑状凝集塊を1〜
20重量部、好ましくは3〜10重量部配合することに
よってゴム表面に凸部が形成され、それによるタイヤ表
面の凹凸によって使用初期から氷路上に発生する水をト
ラップまたは除去する効果が得られ、また、凝着摩擦に
よって氷上摩擦力も向上する。タイヤ表面が走行中に摩
耗するとこの凝集塊がゴムから脱落することで凹部が形
成され、より向上した前記作用効果が持続する。硬質ゴ
ム状弾性体の糸屑状凝集塊の配合量が、ジエン系ゴム1
00重量部当り1重量部未満では水のトラップまたは除
去に必要な表面凹凸が形成されないので好ましくなく、
逆に20重量部を超えると、タイヤ表面の氷路面への接
地面積が低下して氷上摩擦力が低下するので好ましくな
い。
According to the present invention, the diene rubber 100
The lint-like agglomerate of the hard rubber-like elastic body is 1 to 1 part by weight.
By mixing 20 parts by weight, preferably 3 to 10 parts by weight, a convex portion is formed on the rubber surface, whereby the effect of trapping or removing water generated on an icy road from the initial use due to unevenness of the tire surface is obtained, Further, the frictional force on ice is also improved by the cohesive friction. When the tire surface is worn during running, the aggregates fall off the rubber to form a concave portion, and the above-described improved operation and effect are maintained. The blending amount of the lint-like aggregates of the hard rubber-like elastic material is
If the amount is less than 1 part by weight per 00 parts by weight, surface irregularities required for trapping or removing water are not formed, which is not preferable.
Conversely, if it exceeds 20 parts by weight, the contact area of the tire surface with the icy road surface is reduced, and the frictional force on ice is undesirably reduced.

【0010】本発明のゴム組成物に配合される硬質ゴム
状弾性体の糸屑状凝集塊は、室温でのJIS A硬度が
70以上の硬質ゴム状弾性体、例えば、ウレタンゴムや
アクリルニトリル−ブタジエンゴム(NBR)等の硬質
ゴム状弾性体を旋盤などで連続的に切削することにより
得られる糸屑状の切削片がカールして凝集塊状になった
ものであって、その嵩比重が(JIS K 6220に
より測定)0.3〜0.8にあるものが用いられる。前
記の凝集塊の嵩比重が0.3未満のものでは、ゴムコン
パウンドとの混合中に糸屑状凝集塊がほぐされて適度な
大きさの凝集塊が形成されないので好ましくなく、ま
た、0.8を超える嵩比重のものでは、硬い異物として
ゴム中に存在するようになりゴムと氷表面との接地性を
低下させてしまうので好ましくない。
[0010] The lint-like aggregate of the hard rubber-like elastic material blended in the rubber composition of the present invention is a hard rubber-like elastic material having a JIS A hardness of 70 or more at room temperature, such as urethane rubber or acrylonitrile. A lint-like cut piece obtained by continuously cutting a hard rubber-like elastic body such as butadiene rubber (NBR) with a lathe or the like is curled into an agglomerate, and has a bulk specific gravity of ( (Measured by JIS K 6220) 0.3 to 0.8. If the bulk specific gravity of the agglomerate is less than 0.3, the lint-like agglomerate is loosened during mixing with the rubber compound, so that an agglomerate of an appropriate size is not formed. A material having a bulk specific gravity of more than 8 is not preferable because it is present as a hard foreign substance in the rubber, which lowers the contact property between the rubber and the ice surface.

【0011】本発明によるスタッドレスタイヤ用ゴム組
成物には、ジエン系ゴムに加えて補強性充填剤、硫黄、
加硫促進剤、老化防止剤、充填剤、軟化剤、可塑剤など
のタイヤ用に一般に配合されている各種添加剤や特殊配
合剤、例えばゴム成分としてではなく可塑剤としての低
分子量ポリマー(重量平均分子量1,000〜60,0
00)や低硬質ゴム、短繊維などを配合することがで
き、かかる配合物は一般的な方法で加硫してタイヤトレ
ッドを製造することができる。これらの各種添加剤の配
合量も一般的な量とすることができる。
In the rubber composition for a studless tire according to the present invention, a reinforcing filler, sulfur,
Various additives and special additives commonly used for tires, such as vulcanization accelerators, anti-aging agents, fillers, softeners, plasticizers, etc., such as low molecular weight polymers (weight Average molecular weight 1,000-60,0
00), low-hard rubber, short fibers, and the like, and such a compound can be vulcanized by a general method to produce a tire tread. The amounts of these various additives can be made general amounts.

【0012】[0012]

【実施例】以下、実施例およ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。
The present invention will be further described below with reference to Examples and Comparative Examples, but it goes without saying that the scope of the present invention is not limited to these Examples.

【0013】以下の実施例および比較例の配合に用いた
配合成分は、以下の市販品および作製物を用いた。 NR*1:TTR20 BR*2:NIPOL 1220(日本ゼオン) カーボンブラック*3:SHOBLACK N220(昭
和キャボット) 液状ポリマー*4:Polyoil 130(日本ゼオ
ン)(液状BR、重量平均分子量=15,000、シス
含量80%) 老化防止剤*5:アンチゲン6C(住友化学工業) 加硫促進剤*6:ノクセラーNS−F(大内新興化学) ウレタン糸屑状凝集塊*7:JIS A硬度90のウレタ
ンロールを回転させてバイトの送り量、切り込み深さを
調整して細い糸状の切削クズを連続的に作製した。(嵩
比重:0.5)
The following commercial products and products were used as the components used in the following Examples and Comparative Examples. NR * 1 : TTR20 BR * 2 : NIPOL 1220 (Zeon Corporation) Carbon black * 3 : SHOBLACK N220 (Showa Cabot) Liquid polymer * 4 : Polyoil 130 (Zeon Corporation, Japan) (liquid BR, weight average molecular weight = 15,000, cis Anti-aging agent * 5 : Antigen 6C (Sumitomo Chemical Industries) Vulcanization accelerator * 6 : Noxeller NS-F (Ouchi Shinko Chemical) Urethane lint-like aggregate * 7 : Urethane roll with JIS A hardness of 90 Was rotated to adjust the feed amount of the cutting tool and the cutting depth to continuously produce thin thread-like cutting waste. (Bulk specific gravity: 0.5)

【0014】試験片の作製 表Iに示す配合内容(重量部)でそれぞれの成分を配合
し、加硫促進剤と硫黄を除く原料ゴム及び配合剤を1.
7リットルのバンバリーミキサーで5分間混合した後、
この混合物に加硫促進剤と硫黄とを8インチの試験用練
りロール機で4分間混練し、ゴム組成物を得た。これら
のゴム組成物を160℃で20分間プレス加硫して、目
的とする試験片を作製した。
Preparation of Test Specimens Each component was blended according to the blending contents (parts by weight) shown in Table I.
After mixing with a 7 liter Banbury mixer for 5 minutes,
The mixture was kneaded with a vulcanization accelerator and sulfur with an 8-inch test kneading roll machine for 4 minutes to obtain a rubber composition. These rubber compositions were press-vulcanized at 160 ° C. for 20 minutes to produce target test pieces.

【0015】氷上摩擦試験 氷上摩擦試験方法は、温度制御された恒温室内に設置さ
れた氷面上にゴム試験片を一定荷重で押し付け、一定速
度で滑らせる時の抵抗(摩擦力)を検出することによっ
て行われる。実施例及び比較例に示した氷上摩擦試験条
件は、氷温−3℃、速度10〜25km/hr、試験片には
接地圧力が3kg/cm2 となるように荷重をかける。
On- ice friction test The on-ice friction test method detects a resistance (friction force) when a rubber test piece is pressed with a constant load on an ice surface placed in a temperature-controlled constant temperature chamber and slid at a constant speed. This is done by: The friction test conditions on ice shown in the examples and comparative examples are as follows: ice temperature: -3 ° C., speed: 10 to 25 km / hr, and a load applied to the test piece so that the contact pressure is 3 kg / cm 2 .

【0016】実施例1〜2および比較例1 上記試験片の作製により得た試験片について、バフ前の
場合(実施例1)およびバフ後の場合(実施例2)の氷
上摩擦試験の結果を以下の表Iに示す。なお、結果は、
比較例1の摩擦係数値を100として指数で表示した。
指数が大きい方が結果が良好であることを示す。
Examples 1 and 2 and Comparative Example 1 The results of the friction test on ice before buffing (Example 1) and after buffing (Example 2) were obtained for the test pieces obtained by preparing the above test pieces. It is shown in Table I below. The result is
The friction coefficient value of Comparative Example 1 was set to 100 and indicated by an index.
Larger indices indicate better results.

【0017】[0017]

【表1】 [Table 1]

【0018】[0018]

【発明の効果】表Iの結果からみられるように、本発明
に従ってジエン系ゴムに特定の硬質ゴム状弾性体の糸屑
状凝集塊を配合することにより、タイヤの使用当初から
氷上摩擦力の向上が得られ、これを、スタッドレスタイ
ヤ用ゴム組成物として有効に使用することができる。
As can be seen from the results of Table I, by blending a lump-like aggregate of a specific hard rubber-like elastic material with a diene rubber according to the present invention, the frictional force on ice can be improved from the beginning of use of the tire. This can be effectively used as a rubber composition for a studless tire.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI C08L 21:00) ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI C08L 21:00)

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 ジエン系ゴム100重量部に対し、硬質
ゴム状弾性体の糸屑状凝集塊を1〜20重量部配合して
なるスタッドレスタイヤ用ゴム組成物。
1. A rubber composition for a studless tire, comprising 1 to 20 parts by weight of a lump-like aggregate of a hard rubber-like elastic body per 100 parts by weight of a diene rubber.
【請求項2】 前記硬質ゴム状弾性体が室温のJIS
A硬度で70以上であり、その糸屑状凝集塊の嵩比重が
0.3〜0.8である請求項1に記載のスタッドレスタ
イヤ用ゴム組成物。
2. The method according to claim 1, wherein said hard rubber-like elastic body is JIS at room temperature.
The rubber composition for a studless tire according to claim 1, wherein the rubber composition has an A hardness of 70 or more, and the lump-like aggregate has a bulk specific gravity of 0.3 to 0.8.
【請求項3】 前記ジエン系ゴムの平均ガラス転移温度
が−55℃以下である請求項1または2に記載のスタッ
ドレスタイヤ用ゴム組成物。
3. The rubber composition for a studless tire according to claim 1, wherein the diene rubber has an average glass transition temperature of −55 ° C. or less.
JP10077791A 1998-03-25 1998-03-25 Rubber composition for studless tire Pending JPH11279332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10077791A JPH11279332A (en) 1998-03-25 1998-03-25 Rubber composition for studless tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10077791A JPH11279332A (en) 1998-03-25 1998-03-25 Rubber composition for studless tire

Publications (1)

Publication Number Publication Date
JPH11279332A true JPH11279332A (en) 1999-10-12

Family

ID=13643821

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10077791A Pending JPH11279332A (en) 1998-03-25 1998-03-25 Rubber composition for studless tire

Country Status (1)

Country Link
JP (1) JPH11279332A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008542089A (en) * 2005-05-24 2008-11-27 ソシエテ ド テクノロジー ミシュラン Tires for motorcycles
WO2019031144A1 (en) * 2017-08-10 2019-02-14 株式会社ブリヂストン Rubber composition, production method therefor, and tire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008542089A (en) * 2005-05-24 2008-11-27 ソシエテ ド テクノロジー ミシュラン Tires for motorcycles
WO2019031144A1 (en) * 2017-08-10 2019-02-14 株式会社ブリヂストン Rubber composition, production method therefor, and tire
JPWO2019031144A1 (en) * 2017-08-10 2020-08-27 株式会社ブリヂストン Rubber composition, method for producing the same, and tire

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