JP2001302848A - Rubber composition for studless tires - Google Patents
Rubber composition for studless tiresInfo
- Publication number
- JP2001302848A JP2001302848A JP2000124094A JP2000124094A JP2001302848A JP 2001302848 A JP2001302848 A JP 2001302848A JP 2000124094 A JP2000124094 A JP 2000124094A JP 2000124094 A JP2000124094 A JP 2000124094A JP 2001302848 A JP2001302848 A JP 2001302848A
- Authority
- JP
- Japan
- Prior art keywords
- parts
- rubber
- weight
- rubber composition
- ice
- 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.)
- Withdrawn
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 32
- 239000005060 rubber Substances 0.000 title claims abstract description 31
- 239000000203 mixture Substances 0.000 title claims abstract description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 15
- 239000006229 carbon black Substances 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- 238000001179 sorption measurement Methods 0.000 claims abstract description 10
- 230000009477 glass transition Effects 0.000 claims abstract description 9
- 238000010521 absorption reaction Methods 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 7
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 6
- 150000001993 dienes Chemical class 0.000 claims abstract description 6
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 6
- 229920001194 natural rubber Polymers 0.000 claims abstract description 6
- 239000011236 particulate material Substances 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 abstract description 12
- 238000005299 abrasion Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000008187 granular material Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 8
- 238000002156 mixing Methods 0.000 description 7
- 238000013329 compounding Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000323 aluminium silicate Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000005062 Polybutadiene Substances 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 239000012744 reinforcing agent Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 235000014692 zinc oxide Nutrition 0.000 description 2
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- 229920003244 diene elastomer Polymers 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- -1 sulfur Chemical class 0.000 description 1
- 235000001508 sulfur Nutrition 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
Abstract
(57)【要約】
【課題】 雪氷路の表面が融解して水膜が形成された状
態にあっても、ミクロスパイク効果を十分に発揮して雪
氷路での耐滑性が改良され、併せて耐摩耗性も改良され
たスタッドレスタイヤ用ゴム組成物の提供。
【解決手段】 ガラス転移点が−７０℃以下のジエン系
合成ゴム４０〜８０％と天然ゴム６０〜２０％よりなる
ゴム成分１００重量部に対し、粒径が１０〜２００μｍ
の中空粒状体が１〜２０重量部、窒素吸着比表面積が６
０〜１３５ｍ2／ｇであってＤＢＰ吸油量の数値が窒素
吸着比表面積の数値より３０〜５５大であるカーボンブ
ラックが２０〜９０重量部配合されたスタッドレスタイ
ヤ用ゴム組成物。(57) [Summary] [Problem] Even when the surface of a snow and ice road is melted and a water film is formed, the micro spike effect is sufficiently exerted to improve the slip resistance on the snow and ice road, and Provided is a rubber composition for a studless tire having improved abrasion resistance. SOLUTION: The particle size is 10 to 200 µm with respect to 100 parts by weight of a rubber component composed of 40 to 80% of a diene-based synthetic rubber having a glass transition point of -70 ° C or less and 60 to 20% of a natural rubber.
1 to 20 parts by weight of a hollow particulate material having a nitrogen adsorption specific surface area of 6
A rubber composition for a studless tire, comprising 20 to 90 parts by weight of carbon black having a value of 0 to 135 m 2 / g and a DBP oil absorption of 30 to 55 greater than a nitrogen adsorption specific surface area.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、雪氷で覆われた道
路を走行する自動車に装着されるタイヤ、所謂スタッド
レスタイヤのトレッドに用いるゴム組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition used for a tread of a tire mounted on an automobile running on a road covered with snow and ice, a so-called studless tire.
【０００２】[0002]
【０００３】硫黄、加硫促進剤、亜鉛華、ステアリン酸
などの必須配合剤とカーボンブラックを配合してなるタ
イヤに広く用いられているゴム組成物は、氷に対しての
摩擦係数が小さく、スタッドレスタイヤのトレッドに用
いた場合、雪氷路面を走行するとき滑りやすいので、摩
擦係数を増大する種々の方法が提案されている。例え
ば、特開昭６０−１９７７５１にトレッドにガラス転移
点が−７０℃以下のＳＢＲに多量の軟化剤とαオレフイ
ンオリゴマーを配合した硬度が比較的低いゴム組成物を
用いることによってトレッド表面が路面の凹凸に添って
変形しやすくし、変形によって実接地面積を増大させて
摩擦力を増大させとるとともに氷点以下の温度になって
も剛性が増大して接地面路積が減少し、摩擦力が低下し
ないようにする方法、特開平２−２７２０４２に一般配
合剤の他に粒径が０．０１〜５mmのアルミナ、花崗岩、
石英などの硬質粒状体を配合してトレッド表面から突き
出させて多数の微小突起を形成させ、微小突起を氷表面
に突き刺すミクロスパイク効果によって摩擦係数を増大
させる方法、特開平８−３３３４８６に粒径１０〜５０
０μｍの粒状体を配合してトレッド表面から突き出させ
て微小突起を形成させ、ミクロスパイク効果によって摩
擦係数を増大させる方法、特開平４−１１７４３９に粒
径が０．５〜２００μｍの炭素質粉体を配合してトレッ
ド表面を粗面にすることによって摩擦係数を増大する方
法が開示されている。[0003] A rubber composition widely used in tires comprising carbon black and essential compounds such as sulfur, a vulcanization accelerator, zinc white, and stearic acid has a low friction coefficient against ice, When used for a tread of a studless tire, various methods have been proposed to increase the coefficient of friction because the tire is slippery when traveling on snow and ice road surfaces. For example, Japanese Unexamined Patent Publication (Kokai) No. 60-197751, the use of a rubber composition having a relatively low hardness obtained by blending a large amount of a softener and an α-olefin oligomer with SBR having a glass transition point of −70 ° C. or less in a tread, Easily deforms along irregularities, increases the actual ground contact area by deformation, increases frictional force, increases rigidity even at temperatures below freezing, reduces ground contact area, reduces frictional force Japanese Patent Application Laid-Open No. Hei 2-272204 discloses a method for preventing the occurrence of such a problem.
A method in which a hard granular material such as quartz is blended and protruded from a tread surface to form a large number of microprojections, and a friction coefficient is increased by a microspike effect of piercing the microprojections into an ice surface. 10-50
Japanese Patent Laid-Open No. 4-117439 discloses a method of blending 0 μm granules and projecting them from the tread surface to form minute projections to increase the friction coefficient by a micro spike effect. And increasing the coefficient of friction by roughening the tread surface.
【０００４】[0004]
【発明が解決しようとする課題】上記方法の従来タイヤ
は、気温が−５℃より高くなった場合、或いは日照の場
合、雪氷路面ではタイヤの走行時の摩擦熱で氷の融解が
起こり、タイヤの接地面と氷の間にたえず水膜が介在し
た状態になってタイヤ表面の一部が直接路面に接触しな
いようになり、摩擦力が低下してしまう。一方、剛性の
大きい粒状体はゴム組成物内で異物として作用し、走行
中揉まれて粒状体を分散させているマトリックス相を傷
つけるので一般タイヤより摩耗しやすい。耐摩耗性を増
大するために粒子径の小さいカーボンブラックの使用、
或いはカーボンブラックの配合量の増加を行えば、変形
しにくくなって実接地面積が減少し、摩擦力が低下す
る。そのために耐摩耗性を一般タイヤのレベルに維持し
ながら雪氷路での耐滑性を向上させることは困難であ
り、雪氷路における耐滑性は十分満足できる状態に至っ
ていない。In the conventional tire of the above method, when the temperature becomes higher than -5.degree. C., or in the case of sunshine, ice melts due to frictional heat generated when the tire is running on snowy and iced roads, and the tire has a problem. A water film is constantly interposed between the ground contact surface and the ice, so that a part of the tire surface does not directly contact the road surface, and the frictional force is reduced. On the other hand, the granular material having high rigidity acts as a foreign substance in the rubber composition, and is rubbed during traveling, damaging the matrix phase in which the granular material is dispersed, and thus is more easily worn than a general tire. Use of carbon black with a small particle size to increase wear resistance,
Alternatively, if the blending amount of carbon black is increased, deformation becomes difficult, the actual ground contact area decreases, and the frictional force decreases. Therefore, it is difficult to improve the slip resistance on snow and ice roads while maintaining the wear resistance at the level of a general tire, and the slip resistance on snow and ice roads has not yet reached a sufficiently satisfactory state.
【０００５】本発明は、雪氷路の表面が融解して水膜が
形成された状態にあっても、ミクロスパイク効果、摩擦
係数増大効果を十分に発揮して雪氷路上での耐滑性が改
良され、併せて耐摩耗性も改良され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。According to the present invention, even when the surface of a snow and ice road is melted and a water film is formed, the micro spike effect and the effect of increasing the friction coefficient are sufficiently exhibited to improve the slip resistance on the snow and ice road. It is another object of the present invention to provide a rubber composition for a studless tire having improved abrasion resistance.
【０００６】[0006]
【課題を解決するための手段】本発明は、ガラス転移点
が−７０℃以下のジエン系合成ゴム４０〜８０％と天然
ゴム６０〜２０％よりなるゴム成分１００重量部に対
し、粒径が１０〜２００μｍの中空粒状体が１〜２０重
量部、窒素吸着比表面積が６０〜１３５ｍ2 ／ｇである
と同時にｍｌ／１００ｇで表したＤＢＰ吸油量の数値が
窒素吸着比表面積の数値より３０〜５５大であるカーボ
ンブラックが２０〜９０重量部配合されたスタッドレス
タイヤ用ゴム組成物である。SUMMARY OF THE INVENTION The present invention relates to a rubber composition comprising 40 to 80% of a diene-based synthetic rubber having a glass transition point of -70 ° C. or less and 60 to 20% of a natural rubber, and 100 parts by weight of a rubber component. 1 to 20 parts by weight of a hollow particulate material having a diameter of 10 to 200 μm, a nitrogen adsorption specific surface area of 60 to 135 m 2 / g, and at the same time, a value of DBP oil absorption expressed in ml / 100 g is 30 to This is a rubber composition for a studless tire containing 55 to 90 parts by weight of carbon black.
【０００７】[0007]
【発明の実施の形態】ゴム成分にガラス転移点が−７０
℃以下のジエン系合成ゴムを用いることにより、低温時
にトレッドが硬化して変形しにくくなることによる摩擦
力の低下が生じないようにすることができ、ガラス転移
点が−７０℃以下のジエン系合成ゴムの引き裂き抵抗が
小さい欠点を改善するために天然ゴムが２０〜６０％使
用される。ガラス転移点が−７０℃以下のジエン系合成
ゴムとしてはブタジエンゴム、スチレン含有量が２５重
量％以下の溶液重合スチレン・ブタジエンゴムなどが例
示される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The rubber component has a glass transition point of -70.
By using a diene-based synthetic rubber having a glass transition point of −70 ° C. or less, the use of a diene-based synthetic rubber having a glass transition point of −70 ° C. or less can prevent the tread from hardening and becoming less deformable at low temperatures. Natural rubber is used in an amount of 20 to 60% in order to improve the disadvantage that the tear resistance of synthetic rubber is low. Examples of the diene-based synthetic rubber having a glass transition point of -70 ° C or lower include butadiene rubber and a solution-polymerized styrene-butadiene rubber having a styrene content of 25% by weight or less.
【０００８】組成物に配合されてトレッド内に分散した
中空粒状体の一部がトレッド表面に露出して破壊され、
トレッド表面に多数の微小穴が形成される。トレッド表
面に多数の微小穴が設けられることにより、雪氷路面の
表面が融解してトレッドと氷の間に介在する水膜を微小
穴に吸い取らせて拭き取るように接地面から短時間のう
ちに除去し、直接トレッド表面を路面に接触させること
ができる。これにより、雪氷路面の温度が高くなって滑
りやすい状態になったときでもミクロスパイク効果が奏
されるようになる。また、微小穴と粒状体が形成する突
起によってトレッド表面が粗面になり、氷上摩擦力が増
大する。中空粒状体の粒径は１０〜２００μｍが好まし
く、配合量はゴム成分１００部に対して１〜２０部が好
ましい。粒径が１０μｍ未満又は配合量が１部未満の場
合は粒状体の作用が十分でないので水膜を除去する効果
及び氷上摩擦を増大させる効果が小さい。粒径が２００
μｍより大きい場合又は配合量が２０部より多い場合は
耐摩耗性が悪くなる。中空粒状体としては雲母、長石、
沸石などの鉱物粉末を急激に加熱して得られるアルミノ
・シリケートバルーン、シラスバルーン、ガラスバルー
ンなどが例示される。これらの中でも多孔質になってい
るアルミノ・シリケートバルーン、シラスバルーンが好
ましい。[0008] A part of the hollow granules blended in the composition and dispersed in the tread is exposed on the tread surface and broken,
Many fine holes are formed on the tread surface. With a large number of micro holes in the tread surface, the surface of the snow-ice road surface melts, and the water film interposed between the tread and ice is absorbed by the micro holes and removed from the ground surface in a short time. Then, the tread surface can be brought into direct contact with the road surface. As a result, even when the temperature of the snow and ice road surface becomes high and the vehicle becomes slippery, the micro spike effect can be obtained. Further, the tread surface becomes rough due to the projections formed by the minute holes and the granular material, and the frictional force on ice increases. The particle diameter of the hollow granular material is preferably from 10 to 200 μm, and the compounding amount is preferably from 1 to 20 parts with respect to 100 parts of the rubber component. If the particle size is less than 10 μm or the blending amount is less than 1 part, the effect of the granular material is not sufficient, so that the effect of removing the water film and the effect of increasing the friction on ice are small. Particle size 200
If it is larger than μm or if the amount is more than 20 parts, the abrasion resistance becomes poor. As hollow particles, mica, feldspar,
Alumino-silicate balloons, shirasu balloons, glass balloons and the like obtained by rapidly heating mineral powder such as zeolite are exemplified. Among these, porous aluminosilicate balloons and shirasu balloons are preferable.
【０００９】一般に従来のカーボンブラックを用いたゴ
ム組成物は耐摩耗性が増大すれば氷上での摩擦係数が低
下する傾向にあった。しかし、窒素吸着比表面積が６０
〜１３５ｍ2 ／ｇであってｍｌ／１００ｇで表したＤＢ
Ｐ吸油量の数値（以下、ＤＢＰ吸油量の数値をＤＢＰと
表す）が窒素吸着比表面積の数値（以下、窒素吸着比表
面積の数値をＮ２ＳＡと表す）より３０〜５５大である
カーボンブラックは、粒径が同程度のものより耐摩耗性
が大であるにもかかわらずゴム組成物の氷上での摩擦係
数（以下、氷上での摩擦係数及び摩擦力の両者とも氷上
摩擦と言う）を維持することができる。従って、中空粒
状体を配合して耐摩耗性が低下しても、上記カーボンブ
ラックを補強剤に用いて耐摩耗性を増大させれば、氷上
摩擦を損なうことなく、低下した耐摩耗性を回復するこ
とができる。配合量は従来のカーボンブラックがスタッ
ドレスタイヤのトレッド用ゴム組成物に用いられた場合
と同じにされる。すなわちゴム成分１００重量部（以
下、重量部を単に部と言う）に対して２０〜９０部にさ
れる。好ましくは３０〜７０部にされる。Ｎ２ＳＡが１
３５より大になれば、分散が悪くなってＮ２ＳＡが増大
することによる耐摩耗性が向上する効果がＮ２ＳＡの増
加に見合っただけ表れず、返って硬度が高くなるために
氷上摩擦が低下するので好ましくない。ＤＢＰからＮ２
ＳＡを減じた値が３０未満の場合は、Ｎ２ＡＳを増大し
て耐摩耗性を大きくすれば氷上摩擦が損なわれ、５５よ
り大になれば硬度が高くなるために氷上摩擦が低下す
る。In general, a conventional rubber composition using carbon black tends to have a reduced friction coefficient on ice if the wear resistance increases. However, the nitrogen adsorption specific surface area is 60
DB up to 135 m 2 / g expressed in ml / 100 g
Carbon black having a P oil absorption value (hereinafter, DBP oil absorption value as DBP) larger than a nitrogen adsorption specific surface area (hereinafter, nitrogen adsorption specific surface area as N2SA) by 30 to 55, The coefficient of friction of the rubber composition on ice (hereinafter, both the coefficient of friction on ice and the frictional force are referred to as friction on ice) is maintained despite the fact that the rubber composition has greater abrasion resistance than that of the same particle size. be able to. Therefore, even if the wear resistance is reduced by blending the hollow particles, if the wear resistance is increased by using the carbon black as a reinforcing agent, the reduced wear resistance can be recovered without impairing the friction on ice. can do. The compounding amount is the same as when conventional carbon black is used in a rubber composition for a tread of a studless tire. That is, the amount is set to 20 to 90 parts with respect to 100 parts by weight of the rubber component (hereinafter, parts by weight are simply referred to as parts). Preferably it is 30 to 70 parts. N2SA is 1
When it is larger than 35, the effect of improving the abrasion resistance due to poor dispersion and increasing N2SA does not appear in proportion to the increase in N2SA, and the hardness increases and the friction on ice decreases because the hardness increases. Not preferred. DBP to N2
If the value obtained by subtracting SA is less than 30, the friction on ice is impaired if N2AS is increased to increase the wear resistance, and if it is greater than 55, the hardness on ice is reduced because the hardness is increased.
【００１０】本発明のゴム組成物の配合から中空粒状体
を除いた組成物、言い換えれば中空粒状体を分散させる
マトリックス相ゴム組成物の温度０℃における動的弾性
率は５〜１５ＭＰａにされるのが好ましい。動的弾性率
が５ＭＰａより小の場合はトレッド剛性が低下して操縦
安定性が低下し、１５ＭＰａより大になれば氷上摩擦が
低下する。The dynamic elastic modulus at a temperature of 0 ° C. of a composition obtained by removing the hollow particulates from the compounding of the rubber composition of the present invention, in other words, the matrix phase rubber composition in which the hollow particulates are dispersed is adjusted to 5 to 15 MPa. Is preferred. When the dynamic elastic modulus is less than 5 MPa, the tread rigidity is reduced and steering stability is reduced, and when it is greater than 15 MPa, friction on ice is reduced.
【００１１】本発明のゴム組成物は、カーボンブラッ
ク、中空粒状体の他に加硫促進剤、硫黄、亜鉛華、ステ
アリン酸、オイル、老化防止剤などのトレッド用ゴム組
成物に用いられる一般配合剤が一般量配合される。[0011] The rubber composition of the present invention is a general compounding compound used for rubber compositions for treads such as vulcanization accelerators, sulfur, zinc white, stearic acid, oils, antioxidants, etc., in addition to carbon black and hollow granular materials. The agent is blended in a general amount.
【００１２】[0012]
【実施例】天然ゴム５０部とシス・ブタジエンゴム５０
部よりなるゴム成分１００部に対し、表１に示すコロイ
ド特性を有するカーボンブラック（以下、カーボンブラ
ックをカーボンと略称する）、中空粒状体の平均粒径が
１８０μｍのシラスバルーン又は平均粒径が１００μｍ
のアルミノ・シリケートバルーン（ＡＢＳと略称する）
又は平均粒径が１００μｍのアルミナ及び表２に示す他
の配合剤を表２に示す割合（重量部）で配合して混合ゴ
ムを得た。得られた混合ゴムでトレッドを形成したタイ
ヤを試作した。各試作タイヤについて下記の方法で氷上
制動と耐摩耗性の評価を行い結果を表２に示した。EXAMPLE 50 parts of natural rubber and 50 parts of cis-butadiene rubber
Parts of a rubber component consisting of 100 parts by weight, carbon black having the colloidal properties shown in Table 1 (hereinafter, carbon black is abbreviated as carbon), a hollow particle having an average particle diameter of 180 μm, or a shirasu balloon having an average particle diameter of 100 μm
Alumino-silicate balloon (abbreviated as ABS)
Alternatively, alumina having an average particle diameter of 100 μm and another compounding agent shown in Table 2 were blended in the ratio (parts by weight) shown in Table 2 to obtain a mixed rubber. A tire having a tread formed from the obtained mixed rubber was prototyped. Each prototype tire was evaluated for braking on ice and abrasion resistance by the following method, and the results are shown in Table 2.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【表２】 [Table 2]
【００１５】氷上制動の評価方法 乗用車に同種の試作タイヤを装着して２００ｋｍ慣し運
転した後、気温−１℃〜０℃の条件下で雪氷路を時速４
０ｋｍで走行し、走行中急ブレーキを掛け、急ブレーキ
を掛けた地点から停止するまでの停止距離を測定した。
結果を下記式で計算した指数で示した。値が大きいほど
好ましい。 （比較例１タイヤの停止距離）×１００／（各試作タイ
ヤの停止距離）Evaluation method of braking on ice After the same kind of prototype tires are mounted on a passenger car and 200 km of driving is performed, the vehicle is driven on a snowy / ice road at a temperature of -1 ° C to 0 ° C at a speed of 4 hours / hour.
The vehicle was driven at 0 km, the sudden braking was applied during the traveling, and the stopping distance from the point where the sudden braking was applied to the stop was measured.
The result was shown by an index calculated by the following equation. The larger the value, the better. (Comparative Example 1 stopping distance of tire) × 100 / (stop distance of each prototype tire)
【００１６】耐摩耗性の評価方法 １台の乗用車に２種類のタイヤを装着して約１万ｋｍ走
行した後、溝の深さを測定し、走行前後の溝深さの差か
らタイヤの摩耗量を求め、結果を下記式で計算した指数
で示した。値が大きいほど好ましい。 （比較例１タイヤの摩耗量）×１００／（各試作タイヤ
の摩耗量）Evaluation method of wear resistance After traveling about 10,000 km with two types of tires mounted on one passenger car, the depth of the grooves is measured, and the tire wear is determined from the difference between the groove depths before and after traveling. The amount was determined, and the result was indicated by an index calculated by the following equation. The larger the value, the better. (Comparative Example 1 Wear amount of tire) × 100 / (wear amount of each prototype tire)
【００１７】本発明のゴム組成物をトレッドに用いた実
施例タイヤは、從来のカーボンであるＮ３３９を用いて
中空粒状体が配合されていない比較例１より氷上制動性
が優れ、耐摩耗性は同等以上である。比較例１に中空粒
状体を添加した比較例２は、比較例１より氷上制動性は
優れるが、耐摩耗性が低下し、従来カーボンは耐摩耗性
を損なわずに中空粒状体を配合して氷上制動性を向上さ
せることが困難であることを示している。比較例３は中
空粒状体を２０部より多く配合すれば耐摩耗性が低下す
ることを示している。比較例４は、氷上制動性を向上さ
せるために中空になっていない粒状体を用いた例であっ
て、氷上制動性が実施例より劣っており、粒状体が中空
になっている方が氷上制動性向上効果が大きいことを示
している。The tire of the present invention using the rubber composition of the present invention for a tread has better braking performance on ice and abrasion resistance than Comparative Example 1 in which no hollow particulate material is blended using the conventional carbon N339. Is equal to or greater than Comparative Example 2 in which the hollow granular material was added to Comparative Example 1 had better braking performance on ice than Comparative Example 1, but the wear resistance was reduced, and the conventional carbon compounded the hollow granular material without impairing the wear resistance. This indicates that it is difficult to improve the braking performance on ice. Comparative Example 3 shows that if more than 20 parts of the hollow granular material is mixed, the wear resistance is reduced. Comparative Example 4 is an example in which a granular material that is not hollow was used to improve braking performance on ice, and the braking performance on ice was inferior to that of the example. This shows that the effect of improving the braking performance is great.
【００１８】[0018]
【発明の効果】本発明は、従来からスタッドレスタイヤ
用ゴム組成物に用いられている天然ゴムとガラス転移点
が−７０℃以下のジエン系ゴムよりなるゴム成分に粒径
が１０〜２００μｍの中空粒状体を１〜２０重量部を配
合することにより、雪氷路における耐滑性が向上し、補
強剤として窒素吸着比表面積が６０〜１３５ｍ2 ／ｇで
あると同時にｍｌ／１００ｇで表したＤＢＰ吸油量の数
値が窒素吸着比表面積の数値より３０〜５５大であるカ
ーボンブラックを２０〜９０重量部配合することによ
り、中空粒状体を配合したために生じる耐摩耗性の低下
を耐滑性が損なわれることなく回復させる効果を有す
る。According to the present invention, there is provided a rubber component comprising a natural rubber and a diene rubber having a glass transition point of -70 ° C. or less, which has been conventionally used in rubber compositions for studless tires, and having a hollow particle having a particle size of 10 to 200 μm. By blending the granular material in an amount of 1 to 20 parts by weight, the slip resistance on snow and ice roads is improved, and as a reinforcing agent, the nitrogen adsorption specific surface area is 60 to 135 m 2 / g, and at the same time, the DBP oil absorption in ml / 100 g. By mixing 20 to 90 parts by weight of carbon black having a value of 30 to 55 greater than the value of the nitrogen adsorption specific surface area, a decrease in abrasion resistance caused by the compounding of the hollow particulate material can be obtained without impairing the slip resistance. Has the effect of restoring.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大原 利一郎 大阪府大阪市西区江戸堀１丁目17番18号 東洋ゴム工業株式会社内 Ｆターム(参考） 4J002 AC01X AC03W AC08W DA037 DJ006 DL006 FA096 FD017 GN01 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Riichiro Ohara 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka F-term in Toyo Tire & Rubber Co., Ltd. (reference) 4J002 AC01X AC03W AC08W DA037 DJ006 DL006 FA096 FD017 GN01
Claims (1)
合成ゴム４０〜８０％と天然ゴム６０〜２０％よりなる
ゴム成分１００重量部に対し、粒径が１０〜２００μｍ
の中空粒状体が１〜２０重量部、窒素吸着比表面積が６
０〜１３５ｍ2／ｇであると同時にｍｌ／１００ｇで表
したＤＢＰ吸油量の数値が窒素吸着比表面積の数値より
３０〜５５大であるカーボンブラックが２０〜９０重量
部配合されたことを特徴とするスタッドレスタイヤ用ゴ
ム組成物。1. A rubber composition comprising 40 to 80% of a diene synthetic rubber having a glass transition point of -70 ° C. or lower and 60 to 20% of a natural rubber has a particle size of 10 to 200 μm with respect to 100 parts by weight.
1 to 20 parts by weight of a hollow particulate material having a nitrogen adsorption specific surface area of 6
20 to 90 parts by weight of carbon black having a DBP oil absorption value of 30 to 55 greater than that of the nitrogen adsorption specific surface area in the range of 0 to 135 m 2 / g and the value of the DBP oil absorption expressed in ml / 100 g at the same time. Rubber composition for studless tires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000124094A JP2001302848A (en) | 2000-04-25 | 2000-04-25 | Rubber composition for studless tires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000124094A JP2001302848A (en) | 2000-04-25 | 2000-04-25 | Rubber composition for studless tires |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001302848A true JP2001302848A (en) | 2001-10-31 |
Family
ID=18634276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000124094A Withdrawn JP2001302848A (en) | 2000-04-25 | 2000-04-25 | Rubber composition for studless tires |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001302848A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002079807A (en) * | 2000-06-29 | 2002-03-19 | Ohtsu Tire & Rubber Co Ltd :The | Pneumatic tire |
| JP2007308594A (en) * | 2006-05-18 | 2007-11-29 | Sumitomo Rubber Ind Ltd | Rubber composition for tread, and studless tire |
| JP2011046775A (en) * | 2009-08-25 | 2011-03-10 | Bridgestone Corp | Rubber composition for tire tread and pneumatic tire |
| WO2011086061A1 (en) * | 2010-01-18 | 2011-07-21 | Societe De Technologie Michelin | Rubber composition for a snow-tire tread |
| WO2011113731A1 (en) * | 2010-03-19 | 2011-09-22 | Societe De Technologie Michelin | Rubber composition for a winter tyre tread |
| JP2013514398A (en) * | 2009-12-18 | 2013-04-25 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | Winter tires with improved grip on ice |
-
2000
- 2000-04-25 JP JP2000124094A patent/JP2001302848A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002079807A (en) * | 2000-06-29 | 2002-03-19 | Ohtsu Tire & Rubber Co Ltd :The | Pneumatic tire |
| JP2007308594A (en) * | 2006-05-18 | 2007-11-29 | Sumitomo Rubber Ind Ltd | Rubber composition for tread, and studless tire |
| JP2011046775A (en) * | 2009-08-25 | 2011-03-10 | Bridgestone Corp | Rubber composition for tire tread and pneumatic tire |
| JP2013514398A (en) * | 2009-12-18 | 2013-04-25 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | Winter tires with improved grip on ice |
| WO2011086061A1 (en) * | 2010-01-18 | 2011-07-21 | Societe De Technologie Michelin | Rubber composition for a snow-tire tread |
| FR2955328A1 (en) * | 2010-01-18 | 2011-07-22 | Michelin Soc Tech | RUBBER COMPOSITION FOR WINTER PNEUMATIC BEARING BAND |
| JP2013517356A (en) * | 2010-01-18 | 2013-05-16 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | Rubber composition for snow tire tread |
| WO2011113731A1 (en) * | 2010-03-19 | 2011-09-22 | Societe De Technologie Michelin | Rubber composition for a winter tyre tread |
| FR2957602A1 (en) * | 2010-03-19 | 2011-09-23 | Michelin Soc Tech | RUBBER COMPOSITION FOR WINTER PNEUMATIC BEARING BAND |
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