WO2011148965A1 - タイヤトレッド用ゴム組成物 - Google Patents
タイヤトレッド用ゴム組成物 Download PDFInfo
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- WO2011148965A1 WO2011148965A1 PCT/JP2011/061946 JP2011061946W WO2011148965A1 WO 2011148965 A1 WO2011148965 A1 WO 2011148965A1 JP 2011061946 W JP2011061946 W JP 2011061946W WO 2011148965 A1 WO2011148965 A1 WO 2011148965A1
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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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/01—Hydrocarbons
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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
- C08L15/00—Compositions of rubber derivatives
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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
- C08L7/00—Compositions of natural rubber
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/30—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule
- C08C19/42—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups
- C08C19/44—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups of polymers containing metal atoms exclusively at one or both ends of the skeleton
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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
- 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
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S152/00—Resilient tires and wheels
- Y10S152/905—Tread composition
Definitions
- One embodiment of the present invention relates to a rubber composition for a tire tread.
- pneumatic tires are required to have high fuel efficiency and excellent handling stability on wet road surfaces. For this reason, by adding a large amount of silica to the tire tread rubber composition constituting the tread portion, the rolling resistance of the rubber composition is reduced and the wet grip performance is increased.
- the rubber composition containing silica has a problem of poor wear resistance.
- Patent Document 1 proposes a rubber composition for tires for improving low rolling resistance and wet grip performance.
- This rubber composition is obtained by blending silica with a rubber component made of natural rubber, solution-polymerized styrene-butadiene rubber, and emulsion-polymerized styrene-butadiene rubber.
- the three functions of this rubber composition ie, low rolling resistance, wet grip performance, and wear resistance, do not sufficiently satisfy the demand level of consumers. Therefore, it is required to improve the above three functions in the tire rubber composition to a higher level.
- the rubber composition for a tire tread includes three types of emulsion-polymerized styrene-butadiene rubber (E-SBR), terminal-modified solution-polymerized styrene-butadiene rubber (modified S-SBR), and natural rubber (NR).
- E-SBR emulsion-polymerized styrene-butadiene rubber
- modified S-SBR terminal-modified solution-polymerized styrene-butadiene rubber
- NR natural rubber
- the diene rubber contains 10-25% by weight of the natural rubber
- the weight ratio of the three rubbers (E-SBR: modified S-SBR: NR) is (1-2) (2.5-4): 1
- the styrene content of the E-SBR and the modified S-SBR is 35 to 40% by weight
- the glass transition temperature of the E-SBR and the modified S- SBR glass rolling The difference between the temperature is 10 ° C. or less.
- FIG. 1 is a diagram illustrating an example of a pneumatic tire according to the present embodiment.
- This pneumatic tire has a tread portion 1, a sidewall portion 2, and a bead portion 3.
- a bead core 5 is embedded in the bead portion 3. Further, two carcass layers 4 are extended between the left and right bead portions 3.
- the carcass layer 4 is formed by embedding reinforcement cords extending in the tire radial direction at predetermined intervals in the tire circumferential direction and embedded in a rubber layer. Both ends of the carcass layer 4 are folded back from the inner side to the outer side in the tire axial direction so as to sandwich the bead filler 6 around the bead core 5.
- An inner liner layer 7 is disposed inside the carcass layer 4.
- Two belt layers 8 are disposed on the outer peripheral side of the carcass layer 4 in the tread portion 1.
- belt layers 8 are formed by embedding reinforcing cords extending in the tire circumferential direction at predetermined intervals in the tire axial direction and embedded in the rubber layer.
- the inclination directions of the reinforcement cords of the belt layers 8 with respect to the tire circumferential direction are opposite to each other.
- the reinforcing cords of the belt layers 8 cross each other.
- a belt cover layer 9 is disposed on the outer peripheral side of the belt layer 8.
- a tread portion 1 is formed on the outer peripheral side of the belt cover layer 9.
- the tread portion 1 has a tread rubber layer 12.
- the tread rubber layer 12 includes the tire tread rubber composition (present rubber composition) according to the present embodiment.
- Side rubber layers 13 are disposed outside the carcass layer 4 in each sidewall portion 2.
- a rim cushion rubber layer 14 is provided outside the folded portion of the carcass layer 4 in each bead portion 3.
- the rubber component of the rubber composition is a diene rubber.
- This diene rubber includes emulsion-polymerized styrene-butadiene rubber (hereinafter referred to as “E-SBR”), terminal-modified solution-polymerized styrene-butadiene rubber (hereinafter referred to as “modified S-SBR”) and natural rubber (hereinafter referred to as “NR”). It is preferable to include three kinds of rubbers.
- This rubber composition has high wear resistance because it contains E-SBR.
- the E-SBR used is not particularly limited as long as it is a styrene butadiene rubber produced by emulsion polymerization.
- the styrene content of E-SBR is 35 to 40% by weight, preferably 36 to 39% by weight.
- the glass transition temperature of E-SBR (hereinafter referred to as “Tg”) is preferably ⁇ 55 to ⁇ 20 ° C., more preferably ⁇ 50 to ⁇ 25 ° C.
- Tg is the temperature at the midpoint of the glass transition range obtained by E-SBR thermogram measurement by differential scanning calorimetry (DSC). The temperature elevation rate condition for this measurement is 20 ° C./min.
- Tg is the glass transition temperature of the styrene butadiene rubber in a state that does not contain an oil-extended component (oil).
- Modified S-SBR is a terminal-modified styrene butadiene rubber produced by solution polymerization so as to have a functional group at one or both ends of a molecular chain.
- the functional group include a hydroxyl group, an alkoxyl group, an epoxy group, a carbonyl group, a carboxyl group, and an amino group.
- the rubber composition may be modified S-SBR that is solution-polymerized by a usual method. Moreover, you may use a commercial item.
- modified S-SBR is blended, the affinity with silica is increased and the dispersibility of silica is improved. For this reason, in this rubber composition, the effect of silica is further improved and the wear resistance is ensured.
- the styrene content of the modified S-SBR is 35 to 40% by weight, preferably 36 to 39% by weight. By setting the styrene content of the modified S-SBR within such a range, it is possible to lower the rolling resistance and increase the rubber strength. For this reason, the abrasion resistance of this rubber composition can be made higher.
- the Tg of the modified S-SBR is preferably ⁇ 45 to ⁇ 15 ° C., more preferably ⁇ 40 to ⁇ 20 ° C. By using the modified S-SBR having such a Tg, it is possible to secure higher wet grip performance and lower rolling resistance.
- the difference between the Tg of E-SBR and that of modified S-SBR is preferably 10 ° C. or less.
- the affinity between E-SBR and modified S-SBR can be increased by setting the difference between the two Tg to 10 ° C. or less. For this reason, the wet grip performance and wear resistance of the rubber composition are improved.
- the difference between the styrene content of E-SBR and the styrene content of modified S-SBR is preferably 4% by weight or less, more preferably 3% by weight or less.
- the compatibility between E-SBR and modified S-SBR can be enhanced by making the difference in the styrene content between the two be 4% by weight or less. For this reason, the low rolling resistance, wet grip performance and wear resistance of the rubber composition can be improved.
- the difference between the styrene content of E-SBR and the styrene content of modified S-SBR is less than 4% by weight, it is possible to increase wear resistance, in particular.
- NR is blended in the diene rubber of the rubber composition.
- the amount of NR in 100% by weight of the diene rubber is 10 to 25% by weight, preferably 15 to 22% by weight. If the blending amount of NR is less than 10% by weight, the wet grip performance cannot be increased. Moreover, when the compounding quantity of NR exceeds 25 weight%, the low rolling resistance and abrasion resistance of a rubber composition will deteriorate.
- the total blending amount of these three types of rubber in 100% by weight of diene rubber is 80% by weight or more, preferably 90 to 100% by weight.
- the total blending amount of the three kinds of rubbers is less than 80% by weight, the low rolling resistance, wet grip performance and wear resistance of the rubber composition cannot be improved from the conventional level.
- the weight ratio of the three rubbers is (1-2) :( 2.5-4): 1, preferably 1 (1.2 to 1.8) :( 2.6 to 3.5): 1.
- E-SBR modified S-SBR: NR
- the weight ratio of the three rubbers is (1-2) :( 2.5-4): 1, preferably 1 (1.2 to 1.8) :( 2.6 to 3.5): 1.
- the diene rubber of the rubber composition may be composed of only the three types of rubber components described above.
- other diene rubbers may be contained in an amount of 20% by weight or less, preferably 10% by weight or less.
- examples of other diene rubbers include isoprene rubber, butadiene rubber, unmodified terminal S-SBR, butyl rubber, and halogenated butyl rubber. It is preferable to use isoprene rubber, butadiene rubber, or unmodified S-SBR.
- Such a diene rubber can be used alone or by blending plural kinds of rubbers.
- a filler containing 70% by weight or more of silica is blended in an amount of 100 to 140 parts by weight, preferably 110 to 130 parts by weight, based on 100 parts by weight of the diene rubber.
- the content of silica in 100% by weight of the filler is 70% by weight or more, preferably 85 to 100% by weight.
- silica content in the filler is 70% by weight or more, preferably 85 to 100% by weight.
- both the low rolling resistance and the wet grip performance of the rubber composition are improved.
- the modified S-SBR is blended as described above, the affinity between the silica and the diene rubber is increased, and the dispersibility of the silica is improved. For this reason, the effect of silica is improved and wear resistance is ensured.
- the silica used in the rubber composition include silica (for example, wet method silica, dry method silica, or surface-treated silica) that is usually blended in a tire tread rubber composition.
- a silane coupling agent with the silica in the rubber composition.
- the blending amount of the silane coupling agent with respect to the blending amount of silica is preferably 3 to 15% by weight, more preferably 5 to 10% by weight.
- the silane coupling agent is less than 3% by weight of the silica weight, the dispersibility of the silica cannot be sufficiently improved.
- a silane coupling agent exceeds 15 weight%, silane coupling agents will superpose
- the silane coupling agent is not particularly limited, but is preferably a sulfur-containing silane coupling agent.
- the sulfur-containing silane coupling agent include bis- (3-triethoxysilylpropyl) tetrasulfide, bis (3-triethoxysilylpropyl) disulfide, 3-trimethoxysilylpropylbenzothiazole tetrasulfide, and ⁇ -mercapto.
- Examples thereof include propyltriethoxysilane and 3-octanoylthiopropyltriethoxysilane.
- Fillers other than silica can be blended with the rubber composition.
- fillers other than silica for example, carbon black, clay, mica, talc, calcium carbonate, aluminum hydroxide, aluminum oxide and the like can be blended. Of these, carbon black is preferably blended. By blending carbon black, the rubber strength is increased, so that the wear resistance of the rubber composition can be increased.
- the content of carbon black in 100% by weight of the filler is preferably 0-30% by weight, more preferably 5-20% by weight. It is not preferable that the content of carbon black exceeds 30% by weight because low rolling resistance deteriorates.
- a terpene resin having a softening point of 100 ° C. or higher is added to the rubber composition.
- the softening point of the terpene resin to be blended is preferably 100 ° C. or higher, more preferably 100 ° C. to 150 ° C., and still more preferably 115 to 135 ° C.
- the softening point of the terpene resin is less than 100 ° C., the wet grip performance cannot be sufficiently improved.
- it is not preferable to use a terpene resin having a softening point exceeding 150 ° C. because grip performance in the initial running may be lowered.
- the softening point of the terpene resin is a temperature measured by the ring and ball method (conforming to JIS K6220-1).
- the blending amount of the terpene resin with respect to 100 parts by weight of the diene rubber is preferably 5 to 25 parts by weight, more preferably 5 to 20 parts by weight.
- the blending amount of the terpene resin is less than 5 parts by weight, the effect of the terpene resin cannot be obtained sufficiently.
- the blending amount of the terpene resin exceeds 25 parts by weight, the wear resistance of the rubber composition is deteriorated.
- terpene resin examples include ⁇ -pinene resin, ⁇ -pinene resin, limonene resin, hydrogenated limonene resin, dipentene resin, terpene phenol resin, terpene styrene resin, aromatic modified terpene resin, hydrogenated terpene resin and the like. It is done. Among these, a resin having a softening point of 100 ° C. or higher may be appropriately selected. Among them, it is preferable to use an aromatic modified terpene resin.
- the tire tread rubber composition contains various additives generally used in tire tread rubber compositions, such as vulcanization or crosslinking agents, vulcanization accelerators, anti-aging agents, plasticizers, and processing aids. Can be blended. These additives are kneaded with the rubber composition by a general method to vulcanize or crosslink the rubber component of the rubber composition. The compounding amount of these additives can be a conventional general compounding amount as long as the function of the rubber composition is not impaired. These additives can be mixed (blended) with the rubber composition by using a known rubber kneading machine (for example, a Banbury mixer, a kneader, a roll, etc.).
- a known rubber kneading machine for example, a Banbury mixer, a kneader, a roll, etc.
- the present rubber composition can be suitably used for a pneumatic tire as shown in FIG.
- this rubber composition By using this rubber composition, the low rolling resistance, wet grip performance and wear resistance of the pneumatic tire can be improved.
- Examples 1 to 3 and Comparative Examples 1 to 12 are 15 types of samples of rubber compositions for tire treads.
- Tables 1 to 3 show blending components and blending amounts (weight ratio) in these examples and comparative examples. These Examples and Comparative Examples were produced as follows. That is, first, the components excluding sulfur and the vulcanization accelerator were kneaded for 5 minutes with a 1.8 L closed mixer. Then, an unvulcanized rubber composition for a tire tread was prepared by kneading the released master batch with sulfur and a vulcanization accelerator added by an open roll. In Tables 1 to 3, the weight ratio of three types of rubber (E-SBR: modified S-SBR: NR) is shown as the weight ratio of the rubber excluding oil-extended oil.
- E-SBR modified S-SBR: NR
- Each table shows the difference in glass transition temperature (Tg) between E-SBR and modified S-SBR. Note that Comparative Examples 1 and 2 contain unmodified S-SBR, not modified S-SBR. Therefore, for these comparative examples, the weight ratio of unmodified S-SBR is calculated and shown.
- the obtained 15 rubber compositions for tire treads were press vulcanized at 160 ° C. for 20 minutes in a mold having a predetermined shape, whereby rubber compositions (vulcanized rubber samples) as examples and comparative examples were obtained. ) was produced. And the abrasion resistance of each rubber composition, wet grip performance, and low rolling resistance were measured by the method shown below.
- Abrasion resistance The lambone wear of each rubber composition was measured in accordance with JIS K6264-2 using a lambone wear tester manufactured by Iwamoto Seisakusho under the conditions of a load of 15 N and a slip rate of 50%.
- the wet grip performance of each rubber composition was evaluated by a loss tangent (tan ⁇ (0 ° C.)) at a temperature of 0 ° C.
- This tan ⁇ (0 ° C.) is known to be an index of wet grip performance.
- the tan ⁇ (0 ° C.) of each rubber composition was measured as follows. That is, tan ⁇ (0 ° C.), which is a loss tangent at a temperature of 0 ° C., was measured using a viscoelastic spectrometer manufactured by Toyo Seiki Seisakusho under the conditions of an initial strain of 10%, an amplitude of ⁇ 2%, and a frequency of 20 Hz.
- the rolling resistance of the obtained vulcanized rubber samples was evaluated by a loss tangent (tan ⁇ (60 ° C)) at a temperature of 60 ° C.
- This tan ⁇ (60 ° C.) is known to be an index of rolling resistance.
- the tan ⁇ (60 ° C.) of each rubber composition was measured as follows. That is, tan ⁇ (60 ° C.), which is a loss tangent at a temperature of 60 ° C., was measured under the conditions of an initial strain of 10%, an amplitude of ⁇ 2%, and a frequency of 20 Hz using a viscoelastic spectrometer manufactured by Toyo Seiki Seisakusho.
- E-SBR1 Emulsion polymerized styrene butadiene rubber, styrene content is 37% by weight, Tg is -37 ° C, Nipol 9548 manufactured by Nippon Zeon Co., Ltd.
- E-SBR2 emulsion-polymerized styrene butadiene rubber, styrene content is 48% by weight, Tg is -24 ° C., Nipol 1749 manufactured by Nippon Zeon Co., Ltd.
- -SBR3 emulsion-polymerized styrene-butadiene rubber, styrene content 35% by weight, Tg -41 ° C, ESBR 1732 manufactured by Dow Chemicals, and oil-extended / modified product containing 37.5 parts by weight of oil for 100 parts by weight of rubber component
- S-SBR solution-polymerized styrene butadiene rubber having hydroxyl groups, styrene content of 37% by weight Tg: E271, manufactured by Asahi Kasei Chemicals Co., Ltd., an oil-extended product containing 37.5 parts by weight of oil with respect to 100 parts by weight of rubber component.
- S-SBR unmodified solution-polymerized styrene butadiene rubber, styrene content 39% by weight, Tg of ⁇ 23 ° C., Nipol NS522 manufactured by Nippon Zeon Co., Ltd., oil-extended product containing 37.5 parts by weight of oil with respect to 100 parts by weight of rubber component.
- Silica Rhodia Zeosil 1165MP Carbon black: Show black N339 manufactured by Cabot Japan Terpene resin: aromatic modified terpene resin, YS resin TO125 manufactured by Yasuhara Chemical Co., softening point 125 ° C ⁇
- Zinc oxide 3 types of zinc oxide manufactured by Shodo Chemical Co., Ltd.
- Stearic acid Beads stearic acid YR manufactured by NOF Corporation
- Anti-aging agent Santoflex 6PPD manufactured by Flexis ⁇ Wax: Sunnock made by Ouchi Shinsei Chemical Co., Ltd.
- Processing aid STRILLTOL A50P made by SCHILL & SEILACHER Gmbh. & CO.
- Silane coupling agent Sulfur-containing silane coupling agent, Si75 manufactured by Degussa ⁇ Sulfur: Fine powder sulfur with Jinhua seal oil manufactured by Tsurumi Chemical Co., Ltd.
- Vulcanization accelerator CBS accelerator, Nouchira CZ-G manufactured by Ouchi Shinsei Chemical
- the rubber composition of Comparative Example 3 has insufficient wear resistance compared to Comparative Example 1 because the weight ratio of E-SBR is small.
- the wet grip performance is insufficient.
- the wet grip performance is insufficient.
- the wear resistance is insufficient.
- the weight ratio of NR since the weight ratio of NR is large, the wear resistance is insufficient and the low rolling resistance is also deteriorated.
- the weight ratio of NR since the weight ratio of NR is small, the wet grip performance is insufficient.
- the present rubber composition is a rubber composition for tire tread having low rolling resistance, wet grip performance and abrasion resistance which are higher than conventional levels.
- this rubber composition has a total blending amount of three kinds of rubbers composed of emulsion-polymerized styrene-butadiene rubber (E-SBR), terminal-modified solution-polymerized styrene-butadiene rubber (modified S-SBR) and natural rubber (NR).
- E-SBR emulsion-polymerized styrene-butadiene rubber
- modified S-SBR terminal-modified solution-polymerized styrene-butadiene rubber
- NR natural rubber
- It contains a diene rubber that is 80% by weight or more. Then, 100 to 140 parts by weight of a filler is blended with 100 parts by weight of the diene rubber. Further, this filler contains 70% by weight or more of silica.
- the blending amount of NR in the diene rubber is 10 to 25% by weight.
- the weight ratio of the three kinds of rubbers (E-SBR: modified S-SBR: NR) is (1-2) :( 2.5-4): 1.
- the styrene content of E-SBR and modified S-SBR is 35 to 40% by weight. Furthermore, the difference between the glass transition temperature of E-SBR and that of modified S-SBR is 10 ° C. or less. Thereby, the compatibility of E-SBR and modified S-SBR can be enhanced. Furthermore, when the weight ratio of the three types of rubber is within the above range, both low heat buildup and rubber strength can be maintained at a high level. For this reason, in this rubber composition, the low rolling resistance, the wet grip performance and the wear resistance are further improved from the conventional level.
- the terminal-modified solution-polymerized styrene butadiene rubber has at least one functional group selected from a hydroxyl group, an alkoxyl group, an epoxy group, a carbonyl group, a carboxyl group, and an amino group. Is preferred.
- terpene resin having a softening point of 100 ° C. or higher is blended with 100 parts by weight of the diene rubber. Thereby, wet grip performance can be made higher.
- the low rolling resistance, the wet grip performance and the wear resistance are improved from the conventional level.
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Abstract
Description
本発明の目的、特徴、局面、及び利点は、以下の詳細な説明と添付図面とによって、より明白となる。
図1は、本実施形態にかかる空気入りタイヤの一例を示す図である。この空気入りタイヤは、トレッド部1、サイドウォール部2、およびビード部3を有している。
各ゴム組成物のランボーン摩耗を、JIS K6264-2に準拠して、岩本製作所社製ランボーン摩耗試験機を使用し、荷重15N、スリップ率50%の条件で測定した。
各ゴム組成物のウェットグリップ性能を、温度0℃の損失正接(tanδ(0℃))により評価した。このtanδ(0℃)は、ウェットグリップ性能の指標となることが知られている。各ゴム組成物のtanδ(0℃)は、以下のように測定された。すなわち、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の条件下で、温度0℃の損失正接であるtanδ(0℃)を測定した。
得られた加硫ゴムサンプルの転がり抵抗を、温度60℃の損失正接(tanδ(60℃))により評価した。このtanδ(60℃)は、転がり抵抗の指標であることが知られている。各ゴム組成物のtanδ(60℃)は、以下のように測定された。すなわち、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の条件下で、温度60℃の損失正接であるtanδ(60℃)を測定した。
・E-SBR1:乳化重合スチレンブタジエンゴム、スチレン含有量が37重量%、Tgが-37℃、日本ゼオン社製Nipol 9548、ゴム成分100重量部に対しオイル分37.5重量部を含む油展品
・E-SBR2:乳化重合スチレンブタジエンゴム、スチレン含有量が48重量%、Tgが-24℃、日本ゼオン社製Nipol 1749、ゴム成分100重量部に対しオイル分50重量部を含む油展品
・E-SBR3:乳化重合スチレンブタジエンゴム、スチレン含有量が35重量%、Tgが-41℃、Dow Chemicals社製ESBR 1732、ゴム成分100重量部に対しオイル分37.5重量部を含む油展品
・変性S-SBR:ヒドロキシル基を有する溶液重合スチレンブタジエンゴム、スチレン含有量が37重量%、Tgが-27℃、旭化成ケミカルズ社製タフデン E581、ゴム成分100重量部に対しオイル分37.5重量部を含む油展品
・S-SBR:未変性の溶液重合スチレンブタジエンゴム、スチレン含有量が39重量%、Tgが-23℃、日本ゼオン社製Nipol NS522、ゴム成分100重量部に対しオイル分37.5重量部を含む油展品
・NR:天然ゴム、RSS#3
・シリカ:ローディア社製Zeosil 1165MP
・カーボンブラック:キャボットジャパン社製ショウブラックN339
・テルペン系樹脂:芳香族変性テルペン樹脂、ヤスハラケミカル社製YSレジンTO125、軟化点125℃
・酸化亜鉛:正同化学工業社製酸化亜鉛3種
・ステアリン酸:日油社製ビーズステアリン酸YR
・老化防止剤:フレキシス社製サントフレックス6PPD
・ワックス:大内新興化学工業社製サンノック
・加工助剤:SCHILL & SEILACHER Gmbh. & CO.製STRUKTOL A50P
・シランカップリング剤:硫黄含有シランカップリング剤、デグサ社製Si75
・硫黄:鶴見化学工業社製金華印油入微粉硫黄
・加硫促進剤:加硫促進剤CBS、大内新興化学工業社製ノクセラーCZ-G
Claims (10)
- 乳化重合スチレンブタジエンゴム(E-SBR)、末端変性溶液重合スチレンブタジエンゴム(変性S-SBR)及び天然ゴム(NR)からなる3種のゴムの合計の配合量が80重量%以上であるジエン系ゴムを含み、
前記ジエン系ゴム100重量部に対して、充填剤が100~140重量部配合されており、
前記充填剤が、シリカを70重量%以上含み、
前記ジエン系ゴムが、前記天然ゴムを10~25重量%含み、
前記3種のゴムの重量比(E-SBR:変性S-SBR:NR)が、(1~2):(2.5~4):1であり、
前記E-SBR及び変性S-SBRのスチレン含有量が、35~40重量%であり、かつ、
前記E-SBRのガラス転移温度と変性S-SBRのガラス転移温度との差が、10℃以下である、タイヤトレッド用ゴム組成物。 - 前記末端変性溶液重合スチレンブタジエンゴムが、ヒドロキシル基、アルコキシル基、エポキシ基、カルボニル基、カルボキシル基、およびアミノ基から選ばれる少なくとも1種の官能基を有している、請求項1に記載のタイヤトレッド用ゴム組成物。
- 前記ジエン系ゴム100重量部に対し、100℃以上の軟化点を有するテルペン系樹脂が5~25重量部配合されている、請求項1又は2に記載のタイヤトレッド用ゴム組成物。
- 前記E-SBRおよび変性S-SBRのスチレン含有量が、36~39重量%である、請求項1~3のいずれか1項に記載のタイヤトレッド用ゴム組成物。
- 前記E-SBRのガラス転移温度が、-55~-20℃であり、
前記変性S-SBRのガラス転移温度が、-45~-15℃である、請求項1~4のいずれか1項に記載のタイヤトレッド用ゴム組成物。 - 前記E-SBRのスチレン含有量と前記変性S-SBRのスチレン含有量との差が、4重量%以下である、請求項1~5のいずれか1項に記載のタイヤトレッド用ゴム組成物。
- 前記ジエン系ゴムにおける前記3種のゴムの合計の配合量が、90~100重量%である、請求項1~6のいずれか1項に記載のタイヤトレッド用ゴム組成物。
- 前記ジエン系ゴム100重量部に対して、前記充填剤が、110~130重量部配合されている、請求項1~7のいずれか1項に記載のタイヤトレッド用ゴム組成物。
- 前記充填剤が、シリカを85~100重量%含んでいる、請求項1~8のいずれか1項に記載のタイヤトレッド用ゴム組成物。
- 請求項1~9のいずれか1項に記載のタイヤトレッド用ゴム組成物を使用した空気入りタイヤ。
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