WO2023281854A1 - タイヤ用ゴム組成物 - Google Patents
タイヤ用ゴム組成物 Download PDFInfo
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- WO2023281854A1 WO2023281854A1 PCT/JP2022/014282 JP2022014282W WO2023281854A1 WO 2023281854 A1 WO2023281854 A1 WO 2023281854A1 JP 2022014282 W JP2022014282 W JP 2022014282W WO 2023281854 A1 WO2023281854 A1 WO 2023281854A1
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- mass
- rubber
- glass transition
- transition temperature
- thermoplastic resin
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Classifications
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- 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
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- 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
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- 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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/04—Thermoplastic elastomer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- the present invention relates to a rubber composition for tires that achieves both wet grip properties and wear resistance.
- wet grip and abrasion resistance are important performance requirements for tires.
- conventionally known methods include a method of lowering the glass transition temperature of the rubber composition for tires and a method of increasing the compounding amount of a highly reinforcing filler.
- these methods have problems such as a decrease in wet grip properties and an increase in heat build-up, and it has been particularly difficult to achieve both wear resistance and wet grip properties.
- An object of the present invention is to provide a rubber composition for tires that achieves both wet grip properties and wear resistance.
- the rubber composition for tires of the present invention which achieves the above object, is a rubber composition obtained by blending 10 to 50 parts by mass of a thermoplastic resin with 100 parts by mass of a diene rubber containing 60% by mass or more of styrene-butadiene rubber.
- the styrene-butadiene rubber has a styrene content of 5 to 30% by mass and a vinyl content of 10 to 35% by mass, and the diene rubber and the thermoplastic resin are mixed at a mass ratio of 1:1.
- the theoretical value (Tga) of the glass transition temperature of the mixture calculated from the average glass transition temperature (Tg1) and the glass transition temperature (Tg2) of the thermoplastic resin, and the measured value (Tgm) of the glass transition temperature of the mixture difference (Tga-Tgm) is 5 to 50° C.
- the difference (Tg2-Tg1) between the average glass transition temperature (Tg1) of the diene rubber and the glass transition temperature (Tg2) of the thermoplastic resin is The temperature is 110 to 150° C.
- the thermoplastic resin accounts for 30% by mass or more of the total 100% by mass of the plasticizer component contained in the rubber composition.
- the average glass transition temperature (Tg1) of the diene rubber is preferably -45°C or lower, and the glass transition temperature (Tg2) of the thermoplastic resin is preferably 30 to 80°C.
- the ratio of the mass of the thermoplastic resin to the mass of the styrene-butadiene rubber is preferably 0.1 to 0.6.
- the styrene-butadiene rubber preferably has a modifying group at at least one end of its molecular chain.
- the rubber composition for tires preferably contains 10 to 150 parts by mass of silica with respect to 100 parts by mass of the diene rubber. It is more preferable to blend 1 to 20% by mass of.
- the rubber composition for tires consists of a diene rubber containing 60% by mass or more of styrene-butadiene rubber.
- Styrene-butadiene rubber has a styrene content of 5 to 30% by mass and a vinyl content of 10 to 35% by mass, and has a specific relationship with the thermoplastic resin.
- the styrene content of the styrene-butadiene rubber is 5-30% by mass. When the styrene content is 5% by mass or more, the wet performance is improved. When the styrene content is 30% by mass or less, deterioration of wear resistance can be suppressed.
- the styrene content is preferably 10-25% by weight, more preferably 10-20% by weight. In this specification, the styrene content of styrene-butadiene rubber shall be determined by infrared spectroscopic analysis (Hampton method).
- the vinyl content of the styrene-butadiene rubber is 10-35% by mass. When the vinyl content is 10% by mass or more, the rolling resistance is improved. When the vinyl content is 35% by mass or less, deterioration of abrasion resistance can be suppressed.
- the vinyl content is preferably 20-35% by weight, more preferably 25-35% by weight.
- the vinyl content of styrene-butadiene rubber shall be determined by infrared spectroscopic analysis (Hampton method).
- the styrene-butadiene rubber is preferably a modified styrene-butadiene rubber having a modifying group at at least one end of its molecular chain.
- modifying groups include carboxy groups, amino groups, hydroxy groups, alkoxy groups, silyl groups, alkoxysilyl groups, oxysilyl groups, silanol groups, epoxy groups, amide groups, isocyanate groups, isothiocyanate groups, carbonyl groups, aldehyde groups, and the like. is mentioned.
- the diene-based rubber may be any diene-based rubber that is normally used for tires.
- diene-based rubbers other than styrene-butadiene rubber include natural rubber, isoprene rubber, butadiene rubber, styrene-isoprene rubber, isoprene-butadiene rubber, ethylene-propylene-diene copolymer rubber, chloroprene rubber, acrylonitrile-butadiene rubber, and the like. can.
- These diene-based rubbers may be modified with one or more functional groups.
- functional groups are not particularly limited, for example, epoxy group, carboxy group, amino group, hydroxy group, alkoxy group, silyl group, alkoxysilyl group, amide group, oxysilyl group, silanol group, isocyanate group, isothiocyanate group, carbonyl group, aldehyde group, and the like.
- the average glass transition temperature (Tg1) of the diene rubber containing styrene-butadiene rubber is preferably -45°C or lower. By setting the average glass transition temperature (Tg1) of the diene rubber to ⁇ 45° C. or lower, abrasion resistance is improved, which is preferable.
- the average glass transition temperature (Tg1) is more preferably -80°C to -50°C, still more preferably -75°C to -60°C.
- the glass transition temperatures of diene-based rubbers, thermoplastic resins, and mixtures thereof are measured by differential scanning calorimetry (DSC) under the condition of a temperature increase rate of 20° C./min. be the temperature of the point.
- DSC differential scanning calorimetry
- the rubber composition for tires shall contain 60% by mass or more of the above-described styrene-butadiene rubber in 100% by mass of the diene rubber. Abrasion resistance can be ensured by including 60% by mass or more of styrene-butadiene rubber.
- Styrene-butadiene rubber is preferably 60 to 100% by mass, more preferably 65 to 85% by mass, still more preferably 70 to 80% by mass.
- a rubber composition for tires is required to combine a diene rubber and a thermoplastic resin so that the diene rubber and the thermoplastic resin simultaneously satisfy the following relationships (i) and (ii). i.e. (i)
- a mixture obtained by blending a diene rubber and a thermoplastic resin at a mass ratio of 1:1 hereinafter sometimes simply referred to as a "mixture"
- Tga-Tgm the average glass transition temperature of the diene rubber and the heat
- the difference (Tga-Tgm) between the theoretical value (Tga) of the glass transition temperature of the mixture calculated from the glass transition temperature (Tg2) of the plastic resin and the measured value (Tgm) of the glass transition temperature of the mixture is 5 to 50 ° C. be.
- the difference (Tg2-Tg1) between the average glass transition temperature (Tg1) of the diene rubber and the glass transition temperature (Tg2) of the thermoplastic resin is 110 to 150°C.
- the average glass transition temperature (Tg1) of the diene rubber, the glass transition temperature (Tg2) of the thermoplastic resin, and the glass transition temperature (Tgm) of the mixture are measured by the above methods.
- the theoretical value (Tga) of the glass transition temperature of the mixture can be calculated as a weighted average value from the glass transition temperatures and mass ratios of the diene rubber and the thermoplastic resin.
- the difference (Tga-Tgm) between the theoretical value (Tga) of the glass transition temperature of the mixture and the measured value (Tgm) of the glass transition temperature of the mixture is set to be 5°C or more, the resistance Abrasion deterioration can be suppressed. Also, by setting the difference (Tga ⁇ Tgm) to 50° C. or less, deterioration of wet performance can be suppressed.
- the difference (Tga-Tgm) is preferably 40°C or less, more preferably 20°C or less, and even more preferably 11°C or less.
- the difference (Tga-Tgm) is preferably 6°C or higher, more preferably 7°C or higher, and even more preferably 8°C or higher.
- the difference (Tg2-Tg1) between the average glass transition temperature (Tg1) of the diene rubber and the glass transition temperature (Tg2) of the thermoplastic resin is preferably 115-140°C, more preferably 120-135°C.
- thermoplastic resin By blending 10 to 50 parts by mass of a thermoplastic resin with 100 parts by mass of diene rubber, the rubber composition for tires can achieve both wet grip and abrasion resistance. If the thermoplastic resin is less than 10 parts by mass, the effect of improving wet grip properties cannot be sufficiently obtained. If the thermoplastic resin exceeds 50 parts by mass, the effect of improving wear resistance cannot be sufficiently obtained.
- the thermoplastic resin is preferably blended in an amount of 15 to 45 parts by mass, more preferably 20 to 40 parts by mass.
- the thermoplastic resin preferably accounts for 30% by mass or more of the total 100% by mass of the plasticizer component contained in the rubber composition. By making the thermoplastic resin content 30% by mass or more, the effect of improving wear resistance becomes remarkable, which is preferable.
- the thermoplastic resin is more preferably 35 to 100% by mass, still more preferably 40 to 100% by mass, in the total 100% by mass of the plasticizer component.
- plasticizer components contained in the rubber composition include thermoplastic resins, natural oils, synthetic oils, oil extenders (oils) contained in diene rubbers, and liquid rubbers.
- the thermoplastic resin preferably has a mass ratio of 0.1 to 0.6 with respect to the mass of the styrene-butadiene rubber described above.
- a mass ratio of 0.1 or more is preferable because the distribution of the thermoplastic resin in the rubber composition becomes uniform.
- the thermoplastic resin is dispersed in the base rubber component in the rubber composition, which is preferable.
- the mass ratio of the thermoplastic resin to the mass of the styrene-butadiene rubber is more preferably 0.2-0.6, more preferably 0.3-0.5.
- the glass transition temperature (Tg2) of the thermoplastic resin is preferably 30-80°C, more preferably 35-75°C, and even more preferably 40-75°C. By setting the glass transition temperature (Tg2) to 30°C or higher, excessive adhesion of the rubber composition can be suppressed, which is preferable. Further, by setting the glass transition temperature (Tg2) to 80° C. or less, the dissolution in the rubber becomes uniform, which is preferable.
- the softening point of the thermoplastic resin is preferably 80-125°C, more preferably 90-125°C, and even more preferably 95-125°C.
- the softening point of the thermoplastic resin shall be measured based on JIS K6220-1 (ring and ball method).
- thermoplastic resin is not particularly limited as long as it simultaneously satisfies the relationships (i) and (ii) described above with the diene rubber.
- thermoplastic resins include terpene resins, terpene phenol resins, rosin resins, rosin ester resins, C5/C9 resins, coumarone-indene resins, and the like. Among them, C5/C9 resins and terpene resins are preferred.
- the rubber composition for tires preferably contains 10 to 150 parts by mass of silica with respect to 100 parts by mass of diene rubber. It is preferable to mix up to 20% by mass.
- the dispersibility of silica can be improved by blending 1% by mass or more of the alkylalkoxysilane based on the amount of silica. Also, by blending 20% by mass or less, it is possible to suppress deterioration of the reinforcing property of silica, which is preferable.
- Alkylalkoxysilane is more preferably blended in an amount of 3 to 15% by mass, more preferably 4 to 12% by mass of the amount of silica.
- the alkyl group having 3 to 8 carbon atoms may be linear, branched, cyclic, or a combination thereof, preferably linear.
- Examples of the alkyl group include propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, etc., and octyl group is more preferable.
- the alkylalkoxysilane is preferably an alkyltrialkoxysilane having three alkoxy groups.
- Examples of the alkoxy group include methoxy group, ethoxy group, propoxy group, butoxy group and the like, and ethoxy group is preferred.
- the rubber composition for tires contains 100 parts by mass of diene rubber and 10 to 150 parts by mass of silica.
- silica By blending 10 parts by mass or more of silica, wet grip properties and abrasion resistance can be improved. Moreover, deterioration of rolling resistance can be suppressed by blending 150 parts by mass or less of silica.
- Silica is preferably blended in an amount of 50 to 135 parts by mass, more preferably 60 to 125 parts by mass.
- Examples of silica include wet silica (hydrous silicic acid), dry silica (anhydrous silicic acid), calcium silicate, aluminum silicate, etc. These may be used alone or in combination of two or more. Alternatively, surface-treated silica obtained by treating the surface of silica with a silane coupling agent may be used.
- the rubber composition for tires preferably contains a silane coupling agent together with silica, so that the dispersibility of silica can be improved.
- a silane coupling agent a type that is usually blended with silica can be used.
- the silane coupling agent is preferably blended in an amount of 5 to 15% by mass, more preferably 8 to 12% by mass of the amount of silica.
- the rubber composition for tires can contain inorganic fillers other than silica.
- inorganic fillers include carbon black, calcium carbonate, magnesium carbonate, talc, clay, mica, alumina, aluminum hydroxide, titanium oxide, and calcium sulfate. These other fillers may be used alone or in combination of two or more.
- Tire rubber compositions are generally used in tire rubber compositions such as vulcanizing or cross-linking agents, vulcanization accelerators, antioxidants, plasticizers, processing aids, liquid polymers, and thermosetting resins.
- Various additives can be blended within a range that does not impair the object of the present invention.
- such additives can be kneaded by a common method to form a rubber composition for tires and used for vulcanization or crosslinking.
- the blending amount of these additives can be a conventional general blending amount as long as it does not contradict the object of the present invention.
- the rubber composition for tires described above is preferably a rubber composition for tire treads, and can suitably constitute the tread portion of a tire.
- a tire having a tread portion made of the rubber composition for a tire of the present invention can achieve both wet grip properties and wear resistance.
- the tire may be either a pneumatic tire or a non-pneumatic tire.
- the compounding agents shown in Table 2 were used as a common compound, and the rubber compositions for tires (Examples 1 to 6, Reference Example 1, Comparative Examples 1 to 5) having the compounding shown in Table 1 were prepared, excluding sulfur and vulcanization accelerators.
- the ingredients were kneaded in a 1.7 L internal Banbury mixer for 5 minutes before being discharged from the mixer and allowed to cool to room temperature.
- a rubber composition for tires was prepared by putting this into the above-mentioned 1.7 L internal Banbury mixer, adding sulfur and a vulcanization accelerator, and mixing.
- the compounding amounts of the compounding agents shown in Table 2 are shown in parts by mass with respect to 100 parts by mass of the diene rubber shown in Table 1.
- vulcanization was performed at 160° C. for 20 minutes in a mold of 15 cm ⁇ 15 cm ⁇ 0.2 cm to prepare a vulcanized rubber sheet. Elasticity was measured and used as an index of wet grip properties. Moreover, abrasion resistance was measured by the following method.
- Abrasion resistance The vulcanized rubber sheet obtained above was tested in accordance with JIS K6264-1, 2:2005 using a Lambourn abrasion tester (manufactured by Iwamoto Seisakusho) at a temperature of 20 ° C. and a slip rate of 50%. Abrasion loss was measured. The obtained results are shown in the column of "Abrasion resistance" by calculating the reciprocal of each wear loss and indexing the value of Reference Example 1 as 100. It means that the larger the index, the smaller the wear loss and the better the wear resistance.
- ⁇ SBR-1 Modified solution-polymerized styrene-butadiene rubber having a hydroxyl group, NS612 manufactured by ZS Elastomer, glass transition temperature of -61°C, styrene content of 15% by mass, vinyl content of 31% by mass
- SBR-2 Solution-polymerized styrene-butadiene rubber, F3420 manufactured by Asahi Kasei Corporation, glass transition temperature of ⁇ 32° C., styrene content of 37% by mass, vinyl content of 44% by mass
- Resin-1 C9 resin, IMPERA E1875 manufactured by Eastman, glass transition temperature of 75 ° C.
- Resin-2 C5/C9 resin, IMPERA D1506 manufactured by Eastman, glass transition temperature of 38 ° C.
- Silica ZEOSIL 1165MP manufactured by Solvay, CTAB adsorption specific surface area of 160 m 2 /g ⁇ Carbon black: SEAST 9M manufactured by Tokai Carbon Co., Ltd., nitrogen adsorption specific surface area of 150 m 2 /g ⁇
- Coupling agent silane coupling agent, Si69 manufactured by Evonik Degussa, bis (triethoxysilylpropyl) tetrasulfide Aroma oil: Extract No. 4S manufactured by Showa Shell Sekiyu K.K.
- ⁇ Stearic acid Bead stearic acid manufactured by NOF Corporation ⁇ Zinc white: Zinc oxide 3 types manufactured by Seido Chemical Industry Co., Ltd.
- ⁇ Antiaging agent Santoflex 6PPD manufactured by Flexis ⁇ Sulfur: Mucron OT-20 manufactured by Shikoku Kasei Co., Ltd.
- ⁇ Vulcanization accelerator-1 Noxcellar CZ manufactured by Ouchi Shinko Kagaku Co., Ltd.
- ⁇ Vulcanization accelerator-2 Perkacit DPG manufactured by Flexis
- the tire rubber composition of Comparative Example 1 contains less than 60% by mass of the specific styrene-butadiene rubber, and therefore has poor wear resistance. Since the rubber composition for tire of Comparative Example 2 contains less than 10 parts by mass of the thermoplastic resin, it is inferior in wet grip properties. Since the rubber composition for tire of Comparative Example 3 exceeds 50 parts by mass of the thermoplastic resin, the abrasion resistance is inferior.
- the tire rubber composition of Comparative Example 4 has poor wet grip properties because the difference (Tg2-Tg1) between Tg1 of the diene rubber and Tg2 of the thermoplastic resin is less than 110.degree.
- the rubber composition for tires of Comparative Example 5 was the difference (Tga-Tgm) between the theoretical value (Tga) and the measured value (Tgm) of the glass transition temperature of a mixture having a mass ratio of diene rubber and thermoplastic resin of 1:1. exceeds 50° C. and the content of the thermoplastic resin exceeds 50 parts by mass, resulting in poor wear resistance.
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Abstract
Description
(i)ジエン系ゴムおよび熱可塑性樹脂を質量比1:1で配合した混合物(以下、単に「混合物」と略記することがある。)において、ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)から計算される混合物のガラス転移温度の理論値(Tga)と、混合物のガラス転移温度の測定値(Tgm)との差(Tga-Tgm)が5~50℃であること。
(ii)ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)の差(Tg2-Tg1)が110~150℃であること。
本明細書において、ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)、並びに混合物のガラス転移温度(Tgm)は、上記方法で測定するものとする。また、混合物のガラス転移温度の理論値(Tga)は、ジエン系ゴムおよび熱可塑性樹脂のガラス転移温度および質量比から加重平均値として算出することができる。
上記で得られた加硫ゴムシートの動的粘弾性を、東洋精機製作所社製粘弾性スペクトロメーターを用いて、初期歪み10%、振幅±2%、周波数20Hzで測定し、0℃におけるtanδを求めた。得られた結果は、基準例1の値を100とする指数とし、「ウェット性能」の欄に示した。この指数が大きいほど、ウェットグリップ性が優れることを意味する。
上記で得られた加硫ゴムシートについて、JIS K6264-1、2:2005に準拠し、ランボーン摩耗試験機(岩本製作所製)を用いて、温度20℃、スリップ率50%の条件で摩耗減量を測定した。得られた結果は、それぞれの摩耗減量の逆数を算出し、基準例1の値を100とする指数とし、「耐摩耗性」の欄に示した。この指数が大きいほど、摩耗減量が小さく、耐摩耗性が優れることを意味する。
・SBR-1:ヒドロキシ基を有する変性溶液重合スチレンブタジエンゴム、ZSエラストマー社製NS612、ガラス転移温度が-61℃、スチレン含量が15質量%、ビニル含量が31質量%
・SBR-2:溶液重合スチレンブタジエンゴム、旭化成社製F3420、ガラス転移温度が-32℃、スチレン含量が37質量%、ビニル含量が44質量%
・樹脂-1:C9樹脂、イーストマン社製IMPERA E1875、ガラス転移温度が75℃
・樹脂-2:C5/C9樹脂、イーストマン社製IMPERA D1506、ガラス転移温度が38℃
・シリカ:Solvay社製ZEOSIL 1165MP、CTAB吸着比表面積が160m2/g
・カーボンブラック:東海カーボン社製シースト9M、窒素吸着比表面積が150m2/g
・カップリング剤:シランカップリング剤、Evonik Degussa社製Si69、ビス(トリエトキシシリルプロピル)テトラスルフィド
・アロマオイル:昭和シェル石油社製エキストラクト4号S
・ステアリン酸:日油社製ビーズステアリン酸
・亜鉛華:正同化学工業社製酸化亜鉛3種
・老化防止剤:フレキシス社製サントフレックス6PPD
・硫黄:四国化成工業社製ミュークロンOT-20
・加硫促進剤-1:大内新興化学社製ノクセラーCZ
・加硫促進剤-2:フレキシス社製PerkacitDPG
比較例1のタイヤ用ゴム組成物は、特定のスチレンブタジエンゴムが60質量%未満なので、耐摩耗性が劣る。
比較例2のタイヤ用ゴム組成物は、熱可塑性樹脂が10質量部未満なので、ウェットグリップ性が劣る。
比較例3のタイヤ用ゴム組成物は、熱可塑性樹脂が50質量部を超えるので、耐摩耗性が劣る。
比較例4のタイヤ用ゴム組成物は、ジエン系ゴムのTg1および熱可塑性樹脂のTg2の差(Tg2-Tg1)が110℃未満なので、ウェットグリップ性が劣る。
比較例5のタイヤ用ゴム組成物は、ジエン系ゴムと熱可塑性樹脂の質量比1:1の混合物のガラス転移温度の理論値(Tga)と測定値(Tgm)との差(Tga-Tgm)が50℃を超え、熱可塑性樹脂が50質量部を超えるので、耐摩耗性が劣る。
Claims (7)
- スチレンブタジエンゴムを60質量%以上含むジエン系ゴム100質量部に、熱可塑性樹脂を10~50質量部配合してなるゴム組成物であって、前記スチレンブタジエンゴムのスチレン含量が5~30質量%、ビニル含量が10~35質量%であり、前記ジエン系ゴムおよび熱可塑性樹脂を質量比1:1で配合した混合物において、ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)から計算される前記混合物のガラス転移温度の理論値(Tga)と、前記混合物のガラス転移温度の測定値(Tgm)との差(Tga-Tgm)が5~50℃である関係を満たし、かつ前記ジエン系ゴムの平均ガラス転移温度(Tg1)および熱可塑性樹脂のガラス転移温度(Tg2)の差(Tg2-Tg1)が110~150℃であり、前記ゴム組成物中に含まれる可塑剤成分の合計100質量%中、前記熱可塑性樹脂が30質量%以上であるタイヤ用ゴム組成物。
- 前記ジエン系ゴムの平均ガラス転移温度(Tg1)が-45℃以下である請求項1に記載のタイヤ用ゴム組成物。
- 前記スチレンブタジエンゴムの質量に対する前記熱可塑性樹脂の質量の比が0.1~0.6である請求項1または2に記載のタイヤ用ゴム組成物。
- 前記熱可塑性樹脂のガラス転移温度(Tg2)が30~80℃である請求項1~3のいずれかに記載のタイヤ用ゴム組成物。
- 前記スチレンブタジエンゴムが、その分子鎖の少なくとも1つの末端に変性基を有する請求項1~4のいずれかに記載のタイヤ用ゴム組成物。
- さらにシリカを、前記ジエン系ゴム100質量部に対し、10~150質量部配合してなる請求項1~5のいずれかに記載のタイヤ用ゴム組成物。
- 炭素数3~8のアルキル基を有するアルキルアルコキシシランを、前記シリカ量の1~20質量%配合してなる請求項6に記載のタイヤ用ゴム組成物。
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| US18/576,033 US12138962B2 (en) | 2021-07-07 | 2022-03-25 | Rubber composition for tire |
| JP2023533418A JP7741415B2 (ja) | 2021-07-07 | 2022-03-25 | タイヤ用ゴム組成物 |
| CN202280030207.6A CN117222704A (zh) | 2021-07-07 | 2022-03-25 | 轮胎用橡胶组合物 |
| EP22837276.9A EP4368666A4 (en) | 2021-07-07 | 2022-03-25 | RUBBER COMPOSITION FOR TIRES |
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| WO2023176832A1 (ja) * | 2022-03-16 | 2023-09-21 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
| WO2023176831A1 (ja) * | 2022-03-16 | 2023-09-21 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
| WO2023176830A1 (ja) * | 2022-03-16 | 2023-09-21 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
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| US20180282588A1 (en) * | 2017-04-03 | 2018-10-04 | Eastman Chemical Company | Modified resins and uses thereof |
| EP4368667A4 (en) | 2021-07-07 | 2025-07-09 | Yokohama Rubber Co Ltd | RUBBER COMPOSITION FOR TIRE |
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| WO2023176831A1 (ja) * | 2022-03-16 | 2023-09-21 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
| WO2023176830A1 (ja) * | 2022-03-16 | 2023-09-21 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
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| JP7397362B2 (ja) | 2022-03-16 | 2023-12-13 | 横浜ゴム株式会社 | タイヤ用ゴム組成物 |
Also Published As
| Publication number | Publication date |
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| EP4368666A4 (en) | 2025-07-23 |
| CN117222704A (zh) | 2023-12-12 |
| JPWO2023281854A1 (ja) | 2023-01-12 |
| US12138962B2 (en) | 2024-11-12 |
| JP7741415B2 (ja) | 2025-09-18 |
| EP4368666A1 (en) | 2024-05-15 |
| US20240262129A1 (en) | 2024-08-08 |
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