JPH01315439A - Rubber composition for tire tread - Google Patents
Rubber composition for tire treadInfo
- Publication number
- JPH01315439A JPH01315439A JP63146891A JP14689188A JPH01315439A JP H01315439 A JPH01315439 A JP H01315439A JP 63146891 A JP63146891 A JP 63146891A JP 14689188 A JP14689188 A JP 14689188A JP H01315439 A JPH01315439 A JP H01315439A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- rubber composition
- oil absorption
- carbon black
- tire tread
- 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.)
- Granted
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 34
- 239000005060 rubber Substances 0.000 title claims abstract description 34
- 239000000203 mixture Substances 0.000 title claims abstract description 21
- 238000010521 absorption reaction Methods 0.000 claims abstract description 17
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 12
- 229920003244 diene elastomer Polymers 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 230000009477 glass transition Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 10
- 238000004062 sedimentation Methods 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 abstract description 12
- 238000005299 abrasion Methods 0.000 abstract description 6
- 244000043261 Hevea brasiliensis Species 0.000 abstract description 3
- 229920003052 natural elastomer Polymers 0.000 abstract description 3
- 229920001194 natural rubber Polymers 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract 2
- 238000004898 kneading Methods 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 239000002174 Styrene-butadiene Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 229960005419 nitrogen Drugs 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000012488 sample solution Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229920005555 halobutyl Polymers 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C08L23/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
- C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
- C08L23/283—Halogenated homo- or copolymers of iso-olefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、破断強度および耐摩耗性が良好で操縦安定性
に優れたタイヤト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 relates to a rubber composition for a tire tread that has good breaking strength and abrasion resistance and excellent handling stability.
従来、高性能スポーツ車向けのタイヤとして、特に、操
縦安定性に優れたタイヤが要求されている。これに適す
るトレッド用ゴム組成物として、６０℃でのｔａｎδが
高いものが用いられている。６０℃でのｔａｎδが高い
場合には、タイヤのグリップ力（路面把握力）が増すか
らである。Conventionally, tires for high-performance sports cars have been required to have particularly excellent handling stability. As a rubber composition for a tread suitable for this purpose, one having a high tan δ at 60° C. is used. This is because when the tan δ at 60° C. is high, the grip force (road surface gripping force) of the tire increases.
トレッド用ゴム組成物の６０℃でのｔａｎδを高めるた
めに、従来、■ガラス転移点（Ｔｇ）の高いポリマー、
例えば、結合スチレン量の多い高スチレンＳＢＲ（スチ
レン−ブタジエン共重合体ゴム）又はビニル結合量の多
い高ビニルＳＢＲをゴム分として使用したり、■カーボ
ンブラックの配合量を多くしたりする等の手段が取られ
てきた。In order to increase the tan δ at 60°C of a rubber composition for a tread, conventionally, ■ a polymer with a high glass transition point (Tg),
For example, measures such as using high styrene SBR (styrene-butadiene copolymer rubber) with a large amount of bound styrene or high vinyl SBR with a large amount of vinyl bonding as the rubber component, or increasing the amount of carbon black blended. has been taken.
しかしながら、■ではゴム組成物の硬さの温度依存性が
高くなり、高温下で硬さが低下し、剛性が下り、グリッ
プ力が低下するという問題があり、また、■ではゴム組
成物中におけるカーボンブラックの分散が悪くなったり
、ゴム組酸物のヒステリシスロスが高くなってゴム組成
物の動的特性、特に発熱性を増大させ、ゴム組成物が劣
化する等の欠点がある。However, in ■, the temperature dependence of the hardness of the rubber composition becomes high, and there is a problem that the hardness decreases at high temperatures, the rigidity decreases, and the grip strength decreases. There are drawbacks such as poor dispersion of carbon black, increased hysteresis loss of the rubber composition acid, and increased dynamic properties, particularly heat generation, of the rubber composition, resulting in deterioration of the rubber composition.
本発明は、上述した問題点および欠点等を伴うことのな
い、操縦安定性に優れた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。An object of the present invention is to provide a rubber composition for a tire tread that is free from the above-mentioned problems and drawbacks and has excellent handling stability.
このため、本発明は、窒素比表面積（Ｎ、 ＳＡ）１４
０−１６０ｍ”／ ｇ 、 ’； ７’チル７ タレー
ト吸油ｔ（ＤＢＰ吸油量）１２０ｄ／１００ｇ以上、Δ
ＤＢＰ（ＤＢＰ吸油量−２４Ｍ４ＤＢＰ吸油ｉｔ） ３
０ｍ１／１００ｇ以上であって、遠心沈降法により測定
される凝集体分布の半値幅（ΔＤ、Ｌ）が５０ＩＩＩμ
以下であるカーボンブラックを、１種又は２種以上のガ
ラス転移点−４０℃以上のスチレン−ブタジエン共重合
体ゴムとその他のジエン系ゴムからなるゴム１００重量
部に対して５０〜２００重量部含有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を要旨とするもので
ある。Therefore, the present invention has a nitrogen specific surface area (N, SA) of 14
0-160m”/g, ';7'chill 7 Talate oil absorption t (DBP oil absorption) 120d/100g or more, Δ
DBP (DBP oil absorption amount - 24M4DBP oil absorption it) 3
0m1/100g or more, and the half width (ΔD, L) of aggregate distribution measured by centrifugal sedimentation method is 50IIIμ
Contains 50 to 200 parts by weight of the following carbon black per 100 parts by weight of rubber made of one or more styrene-butadiene copolymer rubbers with a glass transition point of -40°C or higher and other diene rubbers. The gist of the present invention is a rubber composition for a tire tread characterized by the following.
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.
（１） カーボンブランク。(1) Carbon blank.
窒素比表面積（Ｎ、ＳＡ）は、１４０〜１６０＋ｎ”／
ｇである。１４０ａ＋２／ｇ未満では耐摩耗性が低くな
り、１６０ｇ”／ｇを超えると耐発熱性が低下するから
である。Nitrogen specific surface area (N, SA) is 140 to 160+n”/
It is g. This is because if it is less than 140a+2/g, the wear resistance will be low, and if it exceeds 160g"/g, the heat resistance will be decreased.
ジブチルフタレート吸油量（ＤＢＰ吸油量）は、１２０
ｍｆ／１００ｇ以上である。 １２０ｍｆ／１００ｇ
未満では、耐摩耗性が低下すると共に操縦安定性が悪く
なるからである。Dibutyl phthalate oil absorption (DBP oil absorption) is 120
mf/100g or more. 120mf/100g
This is because if it is less than that, the wear resistance decreases and the steering stability deteriorates.
ΔＤＢＰ （ＤＢＰ吸油量−２４Ｍ４ＤＢＰ吸油量）は
、３０ｍ／／１００ｇ以上である。３０ｍｆ／１００ｇ
未満の場合には、目的とする高温時のｔａｎδの増加が
得られず、結果として操縦安定性は低下する。ΔDBP (DBP oil absorption amount−24M4DBP oil absorption amount) is 30 m//100 g or more. 30mf/100g
If it is less than the desired value, the desired increase in tan δ at high temperatures cannot be obtained, and as a result, the steering stability deteriorates.
遠心沈降法により測定される凝集体分布の半値幅（ΔＤ
−ｔ）は、５０＋ｎμ以下である。５０Ｉ１１μを超え
ると、耐摩耗性が低下すると共に操縦安安定性も悪くな
るからである。なお、ここでいう遠心沈降法とは、ジツ
イス・レーベル社製ディスク・セントリフユージを使用
して凝集体分布を測定する方法であって、これはストー
クス径の大きい粒子はど速く拡散することを利用して、
沈降粒子の大きさを求めるという方法である。Half-width (ΔD) of aggregate distribution measured by centrifugal sedimentation method
-t) is less than or equal to 50+nμ. This is because if it exceeds 50I11μ, the wear resistance decreases and the steering stability also deteriorates. The centrifugal sedimentation method referred to here is a method of measuring the aggregate distribution using a disc centrifuge manufactured by Gitz Lebel, which measures how quickly particles with a large Stokes diameter diffuse. Take advantage of
This method involves determining the size of sedimented particles.
（２） ゴム。(2) Rubber.
ガラス転移点（Ｔｇ） −４０℃以上の１種又は２種以
上のスチレン−ブタジエン共重合体ゴム（Ｓ Ｂ Ｒ）
とその他のジエン系ゴムからなる。One or more styrene-butadiene copolymer rubbers (SBR) with a glass transition point (Tg) of -40°C or higher
and other diene rubbers.
その他の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、ポリブタジェンゴム、ブチルゴム（
ＩＩＲ） 、ハロゲン化ブチルゴムなどである。従来、
Ｔｇの高いＳＢＲを使った場合、ゴム組成物の硬さの温
度依存性が大きくなり、タイヤ使用温度域（２０℃〜１
００℃）における剛性が下がるだけでなく、破断強度、
耐摩耗性も低下するために、実用化は非常に困難であっ
た０本発明では、前述した特定のカーボンブランクを用
いることにより、破断強度、耐摩耗性、６０℃でのｔａ
ｎδを下げることなく、Ｔｇが一４０℃以上のＳＢＲの
使用を初めて可能としたのである。Examples of other diene rubbers include natural rubber, polyisoprene rubber, polybutadiene rubber, butyl rubber (
IIR), halogenated butyl rubber, etc. Conventionally,
When SBR with a high Tg is used, the temperature dependence of the hardness of the rubber composition becomes large, and the temperature dependence of the hardness of the rubber composition increases, and
Not only does the rigidity at 00℃) decrease, but also the breaking strength
It was very difficult to put it into practical use because the abrasion resistance also decreased. In the present invention, by using the above-mentioned specific carbon blank, the breaking strength, abrasion resistance, and ta
This made it possible for the first time to use SBR with a Tg of 140°C or higher without lowering nδ.
また、本発明では、このＳＢＲ（Ｔｇが一４０℃以上）
に加えてその他のジエン系ゴム、例えば、天然ゴム、ポ
リブタジェンゴムなどを用いてもよい。In addition, in the present invention, this SBR (Tg -40°C or higher)
In addition to this, other diene rubbers such as natural rubber and polybutadiene rubber may also be used.
上記カーボンブラックの配合量は、ゴム１００重量部に
対して５０〜２００重量部である。 ５０重量部未満で
は、タイヤとして十分な耐摩耗性が得られない、一方、
２００重量部を超えるとゴム中へのカーボンブラック粒
子の分散が困難となり、良好なゴム組成物が得られない
からである。The amount of carbon black blended is 50 to 200 parts by weight per 100 parts by weight of rubber. If it is less than 50 parts by weight, sufficient wear resistance as a tire cannot be obtained;
This is because if the amount exceeds 200 parts by weight, it becomes difficult to disperse the carbon black particles in the rubber, making it impossible to obtain a good rubber composition.
本発明のゴム組成物は、カーボンブラックの他に必要に
応じて、例えば、硫黄等の加硫剤、加硫促進剤、加硫促
進助剤、老化防止剤、粘着付与剤、軟化剤、充填剤等を
含有してもよい。In addition to carbon black, the rubber composition of the present invention may contain, if necessary, a vulcanizing agent such as sulfur, a vulcanization accelerator, a vulcanization accelerating aid, an anti-aging agent, a tackifier, a softener, a filler, etc. It may also contain agents etc.
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
ここで用いたスチレン−ブタジエン共重合体ゴム（Ｓ
Ｂ Ｒ）を表１に、カーボンブランクを表２に示した。Examples and Comparative Examples The styrene-butadiene copolymer rubber (S
B R) is shown in Table 1, and the carbon blank is shown in Table 2.
なお、カーボンブラックの特性値は、下記の測定方法■
〜■によった。In addition, the characteristic values of carbon black can be measured using the following measurement method■
According to ~■.
■ 窒素比表面積（ＮＡＳＡ）。■Nitrogen specific surface area (NASA).
ＡＳＴＭ−０３０３７−７８″５ｔａｎｄａｒｄ Ｍｅ
ｔｈｏｄｓ ｏｆ ＴｅｓｔｉｎｇＣａｒｂｏｎ Ｂｌ
ａｃｋ−３ｕｒｆａｃｅ Ａｒｅａ ｂｙ Ｎｉｔｒｏ
ｇｅｎ Ａｄｓ。ASTM-03037-78″5standard Me
thods of Testing Carbon Bl
ack-3surface Area by Nitro
gen Ads.
ｒｐｔｉｏｎ″Ｍｅｔｈｏｄ Ｃによる。rption″Method C.
■ ＤＢＰ吸油量。■ DBP oil absorption.
ＪＩＳ Ｋ ６２２Ｈ１９８２） ｒゴム用カーボンブ
ラック試験方法Ｊ ６．１．２ （１）Ａ法による。JIS K 622H1982) r Carbon black test method for rubber J 6.1.2 (1) According to method A.
■ ２４Ｍ ４ Ｄ Ｂ Ｐ吸油量。■24M 4D B P oil absorption.
＾ＳＴＭ−Ｄ３４９３による。^Based on STM-D3493.
■ ΔＤＢＰ。■ ΔDBP.
ＤＢＰ吸油量−２４Ｍ４ＤＢＰ吸油量。DBP oil absorption amount - 24M4DBP oil absorption amount.
■ 凝集体分布の半値幅（ΔＤｓｔ）。■ Half width of aggregate distribution (ΔDst).
ディスクセントリフユージ（英国Ｊｏｉｃｅ Ｌｏｅｂ
１社製）を用いて次の方法により測定、すなわち、カー
ボンブラックを精秤し、２０容エタノール水溶液と界面
活性剤とを加え、カーボンブラック濃度を５■／１００
ｃｃになるように超音波で分散させて試料溶液を作製す
る。次に、ディスクセントリフユージの回転速度を８０
０Ｏｒｐｍに設定し、スピン液（蒸溜水）１０−をこの
ディスクセントリフユージに加えた後に０．５ ｄのバ
ッファー液（２０容量％エタノール水溶液）を注入する
。ついで、これに試料溶液０．５〜１．Ｏｓｄを注射器
で加え、遠心沈降を開始させ、光沈降法によりストーク
ス径で換算された凝集体分布曲線を作成する。そのヒス
トグラムにおける最多頻度（最大吸光度）の％のときの
凝集体の分布値を半値幅（八〇、ｔ） とする。Disccentrifuge (UK Joyce Loeb)
(manufactured by one company) by the following method: carbon black was accurately weighed, a 20 volume ethanol aqueous solution and a surfactant were added, and the carbon black concentration was adjusted to 5/100.
A sample solution is prepared by ultrasonic dispersion so that the sample solution becomes cc. Next, increase the rotation speed of the disc centrifuge to 80
After setting 0 rpm and adding 10 - of spin liquid (distilled water) to the disc centrifuge, 0.5 d of buffer solution (20 volume % ethanol aqueous solution) is injected. Next, add 0.5 to 1.0% of the sample solution to this. Osd is added with a syringe, centrifugal sedimentation is started, and an aggregate distribution curve converted to Stokes diameter is created by photoprecipitation method. The distribution value of the aggregate at the percentage of the highest frequency (maximum absorbance) in the histogram is defined as the half-width (80, t).
表３に、ゴム組成物（配合は重量部）の加硫物性を示す
。この加硫物性は、各種カーボンブラックを配合したゴ
ム組成物を混練し、１４８℃で３０分間加硫して得られ
た加硫物について、ｔａｎδ （＠０℃、＠６０℃）、
引張強さＴ８、破断エネルギーを評価した結果を記した
ものである。Table 3 shows the vulcanized physical properties of the rubber composition (blending is in parts by weight). The vulcanized physical properties are tan δ (@0°C, @60°C),
The results of evaluating tensile strength T8 and breaking energy are shown.
ｔａｎδについては、粘弾性スペクトロメーター（岩本
製作所■製）を用いて温度０℃、６０℃、歪率１０±２
％、周波数２０Ｈｚで測定した値を用いた。 ｔａｎ
δは数値の大きい方が、タイヤのグリップ力が大きい、
ｔａｎδ＠０℃は湿潤路でのグリップ力の尺度であ
り、ｊａｎ６６０℃は乾燥路でのグリップ力の尺度であ
る−０
引張強さＴＩは、ＪＩＳ Ｋ ６３０１によって測定し
た。数値の大きい方が強度が高い、このＴ１は、ゴム組
成物の引張り強さ、すなわち破断強度を示す。For tan δ, a viscoelastic spectrometer (manufactured by Iwamoto Seisakusho ■) was used at a temperature of 0°C, 60°C, and a strain rate of 10 ± 2.
%, and the value measured at a frequency of 20 Hz was used. tan
The larger the value of δ, the greater the grip force of the tire.
tan δ @ 0°C is a measure of the grip force on a wet road, and jan660°C is a measure of the grip force on a dry road -0. Tensile strength TI was measured according to JIS K 6301. The larger the number, the higher the strength. This T1 indicates the tensile strength, ie, the breaking strength, of the rubber composition.
破断エネルギーは、破断時までの応力−歪曲線下の面積
によって測定した。数値の大きい方がよい。Breaking energy was measured by the area under the stress-strain curve until breakage. The higher the number, the better.
耐摩耗性指数は、ＡＳＴＭ−Ｄ−２２２８に従ってグツ
ドリッチ弐ピコ摩耗試験機を用いて測定し、
で計算して表示した。The abrasion resistance index was measured using a Gudrich Nipico abrasion tester according to ASTM-D-2228, and was calculated and displayed as follows.
（本真以下余白）
表 ３ （３）
表３から明らかなように、実施例１〜５では比較例１〜
１５に比し、ｔａｎδ、破断強度、破断エネルギー、耐
摩耗性のいずれにおいても優れていることが判る。(Margin below the main text) Table 3 (3) As is clear from Table 3, in Examples 1 to 5, Comparative Examples 1 to 5
It can be seen that this material is superior to No. 15 in tan δ, breaking strength, breaking energy, and wear resistance.
以上説明したように、本発明によれば、６０℃および０
℃でのｔａｎδが高く（グリップ力が大）、破断強度、
破断エネルギーが高位に保持され、耐摩耗性に優れたタ
イヤトレッド用ゴム組成物を提供することが可能となる
。このゴム組成物は、タイヤにおけるグリップ限界を向
上せしめることができる。As explained above, according to the present invention, 60°C and 0°C
High tan δ at °C (great grip strength), breaking strength,
It becomes possible to provide a rubber composition for a tire tread that maintains a high breaking energy and has excellent wear resistance. This rubber composition can improve the grip limit in tires.
代理人 弁理士 小 川 信 −Agent: Patent Attorney Nobuo Kogawa -
Claims (1)
ｇ、ジブチルフタレート吸油量（ＤＢＰ吸油量）１２０
ｍｌ／１００ｇ以上、ΔＤＢＰ（ＤＢＰ吸油量−２４Ｍ
４ＤＢＰ吸油量）３０ｍｌ／１００ｇ以上であって、遠
心沈降法により測定される凝集体分布の半値幅（ΔＤ＿
ｓ＿ｔ）が５０ｍμ以下であるカーボンブラックを、１
種又は２種以上のガラス転移点−４０℃以上のスチレン
−ブタジエン共重合体ゴムとその他のジエン系ゴムから
なるゴム１００重量部に対して５０〜２００重量部含有
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
。Nitrogen specific surface area (N_2SA) 140-160m^2/
g, dibutyl phthalate oil absorption (DBP oil absorption) 120
ml/100g or more, ΔDBP (DBP oil absorption - 24M
4DBP oil absorption) 30ml/100g or more, and the half-width of aggregate distribution measured by centrifugal sedimentation method (ΔD_
s_t) of 50 mμ or less, 1
It is characterized by containing 50 to 200 parts by weight per 100 parts by weight of a rubber consisting of one or more styrene-butadiene copolymer rubbers having a glass transition point of -40°C or higher and other diene rubbers. Rubber composition for tire tread.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63146891A JP2601319B2 (en) | 1988-06-16 | 1988-06-16 | Rubber composition for tire tread |
| KR1019890008229A KR910000888A (en) | 1988-06-16 | 1989-06-15 | Rubber composition for tire tread |
| DE3920175A DE3920175C2 (en) | 1988-06-16 | 1989-06-16 | Rubber compound for vehicle tires |
| US07/902,799 US5326810A (en) | 1988-06-16 | 1992-06-24 | Rubber compositions for tire treads of driving stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63146891A JP2601319B2 (en) | 1988-06-16 | 1988-06-16 | Rubber composition for tire tread |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01315439A true JPH01315439A (en) | 1989-12-20 |
| JP2601319B2 JP2601319B2 (en) | 1997-04-16 |
Family
ID=15417913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63146891A Expired - Lifetime JP2601319B2 (en) | 1988-06-16 | 1988-06-16 | Rubber composition for tire tread |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2601319B2 (en) |
| KR (1) | KR910000888A (en) |
| DE (1) | DE3920175C2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5851321A (en) * | 1995-01-13 | 1998-12-22 | The Yokohama Rubber Co., Ltd. | Pneumatic tire including cap tread portion |
| WO2016080539A1 (en) * | 2014-11-20 | 2016-05-26 | デンカ株式会社 | Carbon black and rechargeable battery using same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0693134A (en) * | 1992-07-31 | 1994-04-05 | Sumitomo Chem Co Ltd | Rubber composition excellent in grip and rolling resistance and its production |
| EP0717075B1 (en) * | 1994-12-16 | 1999-07-14 | The Yokohama Rubber Co., Ltd. | Rubber composition, process for producing thereof and use thereof |
| US6242523B1 (en) * | 1999-03-08 | 2001-06-05 | The Goodyear Tire & Rubber Company | Rubber composition with liquid high Tg polymer and tire with tread thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58225139A (en) * | 1982-06-25 | 1983-12-27 | Bridgestone Corp | Rubber composition for tire |
| US4703079A (en) * | 1985-04-12 | 1987-10-27 | The B. F. Goodrich Company | Cutting and chipping resistant tread for heavy service pneumatic off-the-road tires |
-
1988
- 1988-06-16 JP JP63146891A patent/JP2601319B2/en not_active Expired - Lifetime
-
1989
- 1989-06-15 KR KR1019890008229A patent/KR910000888A/en not_active Application Discontinuation
- 1989-06-16 DE DE3920175A patent/DE3920175C2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5851321A (en) * | 1995-01-13 | 1998-12-22 | The Yokohama Rubber Co., Ltd. | Pneumatic tire including cap tread portion |
| WO2016080539A1 (en) * | 2014-11-20 | 2016-05-26 | デンカ株式会社 | Carbon black and rechargeable battery using same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3920175A1 (en) | 1989-12-21 |
| JP2601319B2 (en) | 1997-04-16 |
| KR910000888A (en) | 1991-01-30 |
| DE3920175C2 (en) | 2000-06-08 |
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