Composition for a tire and a tire

Abstract

To provide tire compositions which provide improved overall performance in terms of high-temperature grip performance and low-temperature grip performance, and tires including the tire compositions.SOLUTION: A tire composition contains an elastomer component, a filler, a cyclopentadiene resin, and an ester plasticizer. The cyclopentadiene resin is a hydrogenated dicyclopentadiene resin and / or a dicyclopentadiene-aromatic compound copolymer resin. The tire composition satisfies the following relationship: Elastomer component content≤Filler content.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a tire composition and a tire. [Background technology]

[0002] Various methods for improving the grip performance of pneumatic tires have been studied. For example, Patent Document 1 discloses a method of blending two or more types of silica and particulate zinc oxide in predetermined amounts, with the blending ratio of the two types of silica set within a predetermined range. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-101127 Summary of the Invention [Problem to be solved by the invention]

[0004] As a result of extensive research by the present inventors, it has become clear that there is room for improvement in the overall performance of high-temperature grip performance and low-temperature grip performance in the conventional technology. The present invention aims to solve the new problem discovered by the present inventors and to provide a tire composition that can improve the overall performance of high-temperature grip performance and low-temperature grip performance, and a tire using the same. [Means for solving the problem]

[0005] The present invention relates to a tire composition comprising an elastomer component, a filler, a cyclopentadiene-based resin, and an ester-based plasticizer, wherein the cyclopentadiene-based resin is a hydrogenated dicyclopentadiene-based resin and / or a dicyclopentadiene-aromatic compound copolymer resin, and the amount of the elastomer component is less than or equal to the amount of the filler.

[0006] It is more preferable that the tire composition satisfies the condition that the amount of the ester-based plasticizer is less than or equal to the amount of the cyclopentadiene-based resin.

[0007] The above tire composition preferably has a total styrene amount in the elastomer component of 10% by mass or more.

[0008] The above tire composition preferably contains a liquid aromatic polymer having a weight average molecular weight of 10,000 or less.

[0009] The above tire composition contains a second resin different from the above cyclopentadiene-based resin, the amount of the second resin ≤ the amount of the cyclopentadiene-based resin, and the second resin is preferably an aromatic ring-containing resin.

[0010] The above tire composition preferably contains silica having a nitrogen adsorption specific surface area of 170 m 2 / g or more.

[0011] The above tire composition preferably has a compounding amount of the filler of 100 to 125 parts by mass with respect to 100 parts by mass of the elastomer component.

[0012] [[ID=U+25]]The above tire composition preferably contains a mercapto-based silane coupling agent.

[0013] The above tire composition preferably has a compounding amount of the cyclopentadiene-based resin of 80 parts by mass or less with respect to 100 parts by mass of the elastomer component.

[0014] The present invention also relates to a tire having a tire member using the above composition.

[0015] The above tire member is preferably a tread.

Advantages of the Invention

[0016] According to the present invention, there is provided a tire composition comprising an elastomer component, a filler, a cyclopentadiene-based resin, and an ester plasticizer, wherein the cyclopentadiene-based resin is a hydrogenated dicyclopentadiene-based resin and / or a dicyclopentadiene-aromatic compound copolymer resin, and the amount of the elastomer component is ≦ the amount of the filler. Therefore, the overall performance of high-temperature grip performance and low-temperature grip performance can be improved.

Embodiments for Carrying Out the Invention

[0017] The tire composition of the present invention comprises an elastomer component, a filler, a cyclopentadiene-based resin, and an ester plasticizer, wherein the cyclopentadiene-based resin is a hydrogenated dicyclopentadiene-based resin and / or a dicyclopentadiene-aromatic compound copolymer resin, and the amount of the elastomer component is ≦ the amount of the filler. As a result, the overall performance of high-temperature grip performance and low-temperature grip performance is improved.

[0018] The above tire composition has the aforementioned effects. Although the reason for obtaining such effects is not necessarily clear, it is presumed as follows. In a system in which a larger amount of filler (carbon black or silica) is blended than the elastomer component (rubber components such as natural rubber, butadiene rubber, styrene-butadiene rubber, etc.), the composition tends to be hard and there is a problem of deterioration of low-temperature grip performance. On the other hand, in the present invention, a cyclopentadiene-based resin (hydrogenated dicyclopentadiene-based resin and / or dicyclopentadiene-aromatic compound copolymer resin) and an ester plasticizer are used in combination. Since these two components are easily compatible, the dispersion of the cyclopentadiene-based resin is improved by using them in combination. Therefore, in a system in which a larger amount of filler is blended than the elastomer component, by using these two components in combination, the elastomer is plasticized and a cyclopentadiene-based resin with a good dispersion state exists in the composition. As a result, the tire composition of the present invention is soft at low temperatures and has a large energy loss at high temperatures, so that the overall performance of high-temperature grip performance and low-temperature grip performance can be improved. As described above, even when the amount of the elastomer component ≤ the amount of the filler, by using the cyclopentadiene-based resin and the ester-based plasticizer in combination, the comprehensive performance of the high-temperature grip performance and the low-temperature grip performance can be synergistically improved.

[0019] Hereinafter, the chemicals that can be used in the above tire composition will be described.

[0020] The elastomer component is not particularly limited, and examples thereof include thermoplastic elastomers and rubber components. These may be used alone or in combination of two or more. Among them, a rubber component is preferable. In this specification, the elastomer component is a component that serves as a base material of the composition and means a polymer component having elasticity.

[0021] Here, the weight average molecular weight (Mw) of the elastomer component is preferably 50,000 or more, more preferably 150,000 or more, and still more preferably 350,000 or more. The upper limit of Mw is not particularly limited, but is preferably 4,000,000 or less, more preferably 3,000,000 or less.

[0022] The thermoplastic elastomer is not particularly limited, and examples thereof include olefin-based thermoplastic elastomers, styrene-based thermoplastic elastomers, vinyl chloride-based thermoplastic elastomers, urethane-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, polyester-based thermoplastic elastomers, and fluorine-based thermoplastic elastomers. These may be used alone or in combination of two or more. Among them, a styrene-based thermoplastic elastomer is preferable.

[0023] The styrenic thermoplastic elastomer is not particularly limited as long as it is a thermoplastic elastomer having styrene units (preferably styrene block units). For example, styrene-isobutylene-styrene block copolymer (SIBS), styrene-isoprene-styrene block copolymer (SIS), styrene-isobutylene block copolymer (SIB), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene·butene-styrene block copolymer (SEBS), styrene-ethylene·propylene-styrene block copolymer (SEPS), styrene-ethylene·ethylene·propylene-styrene block copolymer (SEEPS), styrene-butadiene·butene-styrene block copolymer (SBBS), etc. may be mentioned. These may be used alone or in combination of two or more. Among them, SIS, SBS, SEBS, and SBBS are preferable, and SIS and SEBS are more preferable.

[0024] As the thermoplastic elastomer, for example, thermoplastic elastomers manufactured and sold by Kaneka Corporation, Kraton Polymers, Asahi Kasei Corporation, etc. can be used.

[0025] The rubber component is not particularly limited. For example, diene rubbers such as isoprene rubber, butadiene rubber (BR), styrene-butadiene rubber (SBR), styrene-isoprene-butadiene rubber (SIBR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR); acrylic rubbers such as butyl acrylate rubber, ethyl acrylate rubber, octyl acrylate rubber; nitrile rubber; isobutylene rubber; silicone rubber (mirable type, room temperature vulcanizing type); fluororubber, etc. may be mentioned. The rubber component may be used alone or in combination of two or more. Among them, diene rubbers are preferable, isoprene rubber, BR, and SBR are more preferable, and SBR is even more preferable. Also, it is preferable to use SBR in combination with isoprene rubber and / or BR, and it is more preferable to use a combination of SBR, isoprene rubber, and BR.

[0026] The content of the rubber component in 100% by mass of the elastomer component is preferably 20% by mass or more, more preferably 50% by mass or more, still more preferably 70% by mass or more, particularly preferably 80% by mass or more, most preferably 90% by mass or more, and may be 100% by mass. When it is within the above range, the effect tends to be obtained more favorably.

[0027] The content of the diene rubber in 100% by mass of the elastomer component is preferably 20% by mass or more, more preferably 50% by mass or more, still more preferably 70% by mass or more, particularly preferably 80% by mass or more, most preferably 90% by mass or more, and may be 100% by mass. When it is within the above range, the effect tends to be obtained more favorably.

[0028] SBR is not particularly limited, and for example, those commonly used in the tire industry such as emulsion polymerization SBR (E-SBR) and solution polymerization SBR (S-SBR) can be used. These may be used alone or in combination of two or more.

[0029] The styrene amount of SBR is preferably 3% by mass or more, more preferably 5% by mass or more, still more preferably 10% by mass or more, particularly preferably 15% by mass or more, most preferably 20% by mass or more, more preferably 25% by mass or more, more preferably 30% by mass or more, and preferably 60% by mass or less, more preferably 55% by mass or less, still more preferably 50% by mass or less, particularly preferably 45% by mass or less, most preferably 40% by mass or less. When it is within the above range, the effect tends to be obtained more suitably.

[0030] SBR may be non-modified SBR or modified SBR. As the modified SBR, any SBR having a functional group that interacts with a filler such as silica may be used. For example, a terminal-modified SBR (a terminal-modified SBR having the above functional group at the terminal) in which at least one terminal of SBR is modified with a compound (modifying agent) having the above functional group, a main-chain modified SBR having the above functional group in the main chain, a main-chain terminal-modified SBR having the above functional group in the main chain and at the terminal (for example, a main-chain terminal-modified SBR having the above functional group in the main chain and at least one terminal modified with the above modifying agent), a terminal-modified SBR modified (coupled) with a polyfunctional compound having two or more epoxy groups in the molecule and having a hydroxyl group or an epoxy group introduced therein, etc. may be mentioned. These may be used alone or in combination of two or more.

[0031] Examples of the above functional group include an amino group, an amide group, a silyl group, an alkoxysilyl group, an isocyanate group, an imino group, an imidazole group, a urea group, an ether group, a carbonyl group, an oxycarbonyl group, a mercapto group, a sulfide group, a disulfide group, a sulfonyl group, a sulfinyl group, a thiocarbonyl group, an ammonium group, an imide group, a hydrazo group, an azo group, a diazo group, a carboxyl group, a nitrile group, a pyridyl group, an alkoxy group, a hydroxyl group, an oxy group, an epoxy group, etc. These functional groups may have a substituent. Among them, an amino group (preferably an amino group in which a hydrogen atom of the amino group is substituted with an alkyl group having 1 to 6 carbon atoms), an alkoxy group (preferably an alkoxy group having 1 to 6 carbon atoms), an alkoxysilyl group (preferably an alkoxysilyl group having 1 to 6 carbon atoms), and an amide group are preferable.

[0032] As the SBR, for example, SBR manufactured and sold by Sumitomo Chemical Co., Ltd., JSR Corporation, Asahi Kasei Corporation, Nippon Zeon Co., Ltd., etc. can be used.

[0033] The content of SBR in 100% by mass of the elastomer component is preferably 20% by mass or more, more preferably 40% by mass or more. The upper limit is not particularly limited and may be 100% by mass. However, when used in combination with other elastomer components, it is preferably 95% by mass or less, more preferably 90% by mass or less, still more preferably 80% by mass or less, particularly preferably 70% by mass or less, most preferably 60% by mass or less, more preferably 55% by mass or less, and more preferably 53% by mass or less. When within the above range, the effect tends to be obtained more favorably.

[0034] BR is not particularly limited. For example, BR with a high cis content (high cis BR), BR containing 1,2-syndiotactic polybutadiene crystal (SPB), BR synthesized using a rare earth element-based catalyst (rare earth-based BR), etc., which are common in the tire industry, can be used. These may be used alone or in combination of two or more. Among them, rare earth-based BR (particularly rare earth-based BR synthesized using an Nd-based catalyst) is preferred because the effect can be obtained more suitably.

[0035] The cis content of BR is preferably 90% by mass or more, more preferably 95% by mass or more. The upper limit is not particularly limited and may be 100% by mass, but is preferably 98% by mass or less. When within the above range, the effect tends to be obtained more suitably.

[0036] The vinyl content of BR is preferably 10% by mass or less, more preferably 5% by mass or less, still more preferably 3% by mass or less, particularly preferably 1.5% by mass or less. The lower limit is not particularly limited, but is preferably 0.5% by mass or more. When within the above range, the effect tends to be obtained more suitably.

[0037] BR can be either non-modified BR or modified BR. Examples of modified BR include modified BR into which the aforementioned functional groups are introduced. The preferred embodiment is the same as that of modified SBR.

[0038] As the BR, for example, products of Ube Industries, Ltd., JSR Corporation, Asahi Kasei Corporation, Nippon Zeon Co., Ltd., etc. can be used.

[0039] The content of BR in 100% by mass of the elastomer component is not particularly limited at the lower limit, but is preferably 5% by mass or more, more preferably 10% by mass or more, and is preferably 80% by mass or less, more preferably 50% by mass or less, still more preferably 30% by mass or less, and particularly preferably 20% by mass or less. When within the above range, the effect tends to be more preferably obtained.

[0040] Examples of the isoprene rubber include natural rubber (NR), isoprene rubber (IR), modified NR, modified NR, modified IR, etc. As NR, for example, those commonly used in the tire industry such as SIR20, RSS#3, TSR20, etc. can be used. IR is not particularly limited, and for example, those commonly used in the tire industry such as IR2200, etc. can be used. Examples of the modified NR include deproteinized natural rubber (DPNR), high-purity natural rubber (UPNR), etc., examples of the modified NR include epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), grafted natural rubber, etc., and examples of the modified IR include epoxidized isoprene rubber, hydrogenated isoprene rubber, grafted isoprene rubber, etc. These may be used alone or in combination of two or more. Among them, NR is preferable.

[0041] The content of the isoprene rubber in 100% by mass of the elastomer component is preferably 5% by mass or more, more preferably 10% by mass or more, still more preferably 20% by mass or more, particularly preferably 30% by mass or more, and most preferably 40% by mass or more, and is preferably 80% by mass or less, more preferably 60% by mass or less. When within the above range, the effect tends to be more preferably obtained.

[0042] The total styrene content in the elastomer component (the total content of the styrene moieties contained in the total amount of the elastomer component) is preferably 10% by mass or more, more preferably 15% by mass or more, preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less, particularly preferably 25% by mass or less, and most preferably 22% by mass or less. When within the above range, the effects tend to be more suitably obtained. This is presumably because when the elastomer component contains styrene, it becomes easier to realize a state where the energy loss at high temperatures in the above mechanism increases, and thus it becomes easier to improve the high-temperature grip performance. Here, the total styrene content in the elastomer component is Σ (content of each styrene-containing elastomer × styrene content of each styrene-containing elastomer / 100). For example, when the elastomer component consists of 90% by mass of SBR(A) (styrene content 40% by mass), 5% by mass of SBR(B) (styrene content 25% by mass), and 5% by mass of BR, the total styrene content in the elastomer component is 37.25% by mass (= (90 × 40 / 100 + 5 × 25 / 100)).

[0043] In this specification, the weight-average molecular weight (Mw) and number-average molecular weight (Mn) can be determined by standard polystyrene conversion based on the measured values by gel permeation chromatography (GPC) (GPC-8000 series manufactured by Tosoh Corporation, detector: differential refractometer, column: TSKGEL SUPERMULTIPORE HZ-M manufactured by Tosoh Corporation). Also, the cis content (amount of cis-1,4-bonded butadiene units) and vinyl content (amount of 1,2-bonded butadiene units) can be measured by infrared absorption spectroscopy, and the content of aromatic units (preferably styrene content) can be 1 measured by 1H-NMR measurement.

[0044] The above composition (preferably an elastomer composition, more preferably a rubber composition) contains a cyclopentadiene-based resin, that is, a dicyclopentadiene-aromatic compound copolymer resin (DCPD-aromatic compound copolymer resin) and / or a hydrogenated dicyclopentadiene-based resin (hydrogenated DCPD-based resin). These may be used alone or in combination of two or more. Among them, from the viewpoint of obtaining better low-temperature grip performance, a hydrogenated DCPD-based resin is preferable, and from the viewpoint of obtaining better high-temperature grip performance, a DCPD-aromatic compound copolymer resin is preferable. Also, it is preferable to use a combination of two or more kinds.

[0045] In this specification, the dicyclopentadiene-aromatic compound copolymer resin means a resin (resin) obtained by copolymerizing an aromatic compound together with dicyclopentadiene. Note that the dicyclopentadiene-aromatic compound copolymer resin may be hydrogenated.

[0046] The ratio of the aromatic compound to dicyclopentadiene can be set as appropriate, but the aromaticity is preferably 2% by mass or more, more preferably 5% by mass or more, still more preferably 8% by mass or more, and preferably 30% by mass or less, more preferably 20% by mass or less, still more preferably 12% by mass or less. When within the above range, the effect tends to be obtained better. Here, in this specification, the aromaticity means the content of units derived from the aromatic compound in 100% by mass of the dicyclopentadiene-aromatic compound copolymer resin.

[0047] The weight average molecular weight (Mw) of the dicyclopentadiene-aromatic compound copolymer resin is preferably 200 or more, more preferably 300 or more, still more preferably 500 or more, and preferably 5000 or less, more preferably 3000 or less, still more preferably 2000 or less, particularly preferably 1500 or less, and most preferably 1000 or less. When within the above range, the effect tends to be obtained better.

[0048] The above aromatic compound is not particularly limited as long as it is a compound having an aromatic ring. For example, phenol compounds such as phenol, alkylphenol, alkoxyphenol, and unsaturated hydrocarbon group-containing phenol; naphthol compounds such as naphthol, alkylnaphthol, alkoxynaphthol, and unsaturated hydrocarbon group-containing naphthol; styrene derivatives such as styrene, alkylstyrene, alkoxystyrene, and unsaturated hydrocarbon group-containing styrene; coumarone, indene, etc. These may be used alone or in combination of two or more. Among them, phenol and styrene derivatives are preferred, styrene derivatives are more preferred, alkylstyrene is still more preferred, and α-methylstyrene is particularly preferred. Here, the number of carbon atoms of the alkyl group or alkoxy group in the above compound is preferably 1 to 20, more preferably 1 to 12, still more preferably 1 to 8, particularly preferably 1 to 5, and most preferably 1 to 3. Also, the number of carbon atoms of the unsaturated hydrocarbon group in the above compound is preferably 2 to 20, more preferably 2 to 12, and still more preferably 2 to 5. In addition, the above aromatic compound may have one substituent on the aromatic ring or two or more substituents. When there are two or more substituents on the aromatic ring, their substitution positions may be any of the o-position, m-position, and p-position. Further, in a styrene derivative having a substituent on the aromatic ring, the substitution position of the substituent may be the o-position, m-position, or p-position with respect to the vinyl group derived from styrene. These aromatic compounds may be used alone or in combination of two or more.

[0049] Specific examples of the above alkylphenol include, for example, methylphenol, ethylphenol, butylphenol, t-butylphenol, octylphenol, nonylphenol, decylphenol, dinonylphenol, etc. These may be substituted at any of the o-position, m-position, and p-position. Among them, t-butylphenol is preferred, and p-t-butylphenol is more preferred.

[0050] Specific examples of the above alkylnaphthol include compounds in which the phenol moiety of the above alkylphenol is replaced with naphthol.

[0051] Specific examples of the above alkylstyrene include compounds in which the phenol moiety of the above alkylphenol is replaced with styrene.

[0052] Specific examples of the above alkoxyphenol include compounds in which the alkyl group of the above alkylphenol is replaced with a corresponding alkoxy group. Similarly, specific examples of the above alkoxynaphthol include compounds in which the alkyl group of the above alkylnaphthol is replaced with a corresponding alkoxy group. Also, specific examples of the above alkoxystyrene include compounds in which the alkyl group of the above alkylstyrene is replaced with a corresponding alkoxy group.

[0053] Examples of the above unsaturated hydrocarbon group-containing phenol include compounds containing at least one hydroxyphenyl group in one molecule and in which at least one of the hydrogen atoms of the phenyl group is substituted with an unsaturated hydrocarbon group. Examples of the unsaturated bond in the unsaturated hydrocarbon group include a double bond and a triple bond. Examples of the above unsaturated hydrocarbon group include alkenyl groups having 2 to 10 carbon atoms.

[0054] Specific examples of the above unsaturated hydrocarbon group-containing phenol include isopropenylphenol, butenylphenol, and the like. The same applies to the above unsaturated hydrocarbon group-containing naphthol and the above unsaturated hydrocarbon group-containing styrene.

[0055] In this specification, the hydrogenated dicyclopentadiene-based resin means a hydrogenated dicyclopentadiene-based resin (resin). In this specification, the dicyclopentadiene-based resin is a resin containing dicyclopentadiene as the main monomer component constituting the resin skeleton (main chain) (however, dicyclopentadiene-aromatic compound copolymer resins are excluded), and the content of dicyclopentadiene-derived units in 100% by mass of the resin is 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, particularly preferably 98% by mass or more, and most preferably 100% by mass. By setting it within the above range, there is a tendency that the above effects can be obtained more preferably. Examples of the dicyclopentadiene-based resin include petroleum resins produced mainly from dicyclopentadiene obtained by dimerizing cyclopentadiene extracted from the C5 fraction of petroleum.

[0056] The above hydrogenation can be carried out by a known method. For example, any of catalytic hydrogenation using a metal catalyst, a method using hydrazine, etc. can be preferably used (such as JP-A-59-161415). For example, catalytic hydrogenation using a metal catalyst can be carried out by adding hydrogen under pressure in the presence of a metal catalyst in an organic solvent. As the organic solvent, any of tetrahydrofuran, methanol, ethanol, etc. can be preferably used. These organic solvents can be used alone or in combination of two or more. As the metal catalyst, for example, any of palladium, platinum, rhodium, ruthenium, nickel, etc. can be preferably used, and these metal catalysts can be used alone or in combination of two or more. The pressure during pressurization is, for example, 1 to 300 kgf / cm 2 is preferably.

[0057] In the hydrogenated dicyclopentadiene-based resin, the hydrogenation rate (hydrogenation ratio) of the double bond is preferably 20 mol% or more, more preferably 35 mol% or more, still more preferably 50 mol% or more, particularly preferably 65 mol% or more, most preferably 80 mol% or more, even most preferably 90 mol% or more, and still most preferably 100 mol%. By setting it within the above range, there is a tendency that the above effects can be obtained more preferably. In this specification, the hydrogenation rate (hydrogenation ratio) is 1 It can be calculated from the spectral reduction rate of the double bond part of the spectrum obtained by measuring 1H-NMR. In this specification, the hydrogenation rate (hydrogenation ratio) means the hydrogenation rate of the double bond.

[0058] The softening point of the dicyclopentadiene-aromatic compound copolymer resin and the hydrogenated dicyclopentadiene-based resin is preferably 60 to 200 °C. The upper limit is more preferably 160 °C or lower, still more preferably 150 °C or lower, and the lower limit is more preferably 80 °C or higher, still more preferably 90 °C or higher. By setting it within the above range, the above effects tend to be obtained more preferably. In this specification, the softening point of the resin is the temperature at which the sphere drops when measured with a ring and ball type softening point measuring device for the softening point defined in JIS K 6220-1:2001.

[0059] As the dicyclopentadiene-aromatic compound copolymer resin and the hydrogenated dicyclopentadiene-based resin, for example, products of JXTG Energy Corporation, Maruzen Petrochemical Co., Ltd., Exxon Mobil Corporation, etc. can be used.

[0060] In this specification, the content of each structural unit in the above resin is 1 Calculated by 1H-NMR measurement.

[0061] The content of the cyclopentadiene-based resin, that is, the content of the dicyclopentadiene-aromatic compound copolymer resin and the hydrogenated dicyclopentadiene-based resin (the total content of the dicyclopentadiene-aromatic compound copolymer resin and the hydrogenated dicyclopentadiene-based resin) is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, still more preferably 15 parts by mass or more, based on 100 parts by mass of the elastomer component (preferably the rubber component), and is preferably 80 parts by mass or less, more preferably 60 parts by mass or less, still more preferably 40 parts by mass or less, particularly preferably 30 parts by mass or less. When it is within the above range, the effect tends to be obtained better.

[0062] The above composition preferably contains a dicyclopentadiene-aromatic compound copolymer resin and a resin other than a hydrogenated dicyclopentadiene-based resin, that is, a second resin different from the cyclopentadiene-based resin. Thereby, the high-temperature grip performance is more suitably improved. The second resin is not particularly limited, and examples thereof include solid aromatic resins, rosin resins, acrylic resins, non-hydrogenated dicyclopentadiene-based resins, and the like. These may be used alone or in combination of two or more. Among them, aromatic resins (aromatic ring-containing resins) are preferred.

[0063] An aromatic resin (aromatic ring-containing resin) is a polymer containing an aromatic compound as a constituent component. The aromatic compound is not particularly limited as long as it has an aromatic ring, and examples thereof include phenol compounds such as phenol, alkylphenol, alkoxyphenol, and unsaturated hydrocarbon group-containing phenol; naphthol compounds such as naphthol, alkylnaphthol, alkoxynaphthol, and unsaturated hydrocarbon group-containing naphthol; styrene derivatives such as styrene, alkylstyrene, alkoxystyrene, and unsaturated hydrocarbon group-containing styrene; coumarone, indene, and the like. These may be used alone or in combination of two or more.

[0064] Examples of the aromatic resin include α-methylstyrene-based resins, coumarone-indene resins, aromatic-modified terpene resins, terpene-aromatic resins, and the like. These may be used alone or in combination of two or more. Among them, from the viewpoint of obtaining better effects, α-methylstyrene-based resins and aromatic-modified terpene resins are preferred, α-methylstyrene-based resins are more preferred, and copolymers of α-methylstyrene and styrene are even more preferred. Examples of the α-methylstyrene resin include an α-methylstyrene homopolymer, a copolymer of α-methylstyrene and styrene, and the like. The coumarone-indene resin is a resin containing coumarone and indene as monomer components constituting the resin skeleton (main chain). Examples of monomer components other than coumarone and indene contained in the skeleton include styrene, methyl indene, vinyl toluene, and the like. Examples of the aromatic-modified terpene resin include a resin obtained by modifying a terpene resin with an aromatic compound (preferably a styrene derivative, more preferably styrene), and a resin obtained by subjecting the resin to a hydrogenation treatment. Examples of the terpene aromatic resin include a resin obtained by copolymerizing a terpene compound and an aromatic compound (preferably a styrene derivative, a phenol compound, more preferably styrene), and a resin obtained by subjecting the resin to a hydrogenation treatment. These may be used alone or in combination of two or more.

[0065] The softening point of the second resin (preferably an aromatic resin) is preferably 30°C or higher, more preferably 60°C or higher. Further, the softening point is preferably 160°C or lower, more preferably 130°C or lower. When within the above range, the effect tends to be obtained more favorably.

[0066] The content of the second resin (preferably an aromatic resin) is preferably 2 parts by mass or more with respect to 100 parts by mass of the elastomer component (preferably a rubber component). Further, the above content is 10 parts by mass or less, preferably 7 parts by mass or less. When within the above range, the effect tends to be obtained more favorably.

[0067] The above composition contains a second resin different from the cyclopentadiene resin, and the amount of the second resin ≤ the amount of the cyclopentadiene resin. The second resin is preferably an aromatic resin (aromatic ring-containing resin). Thereby, the effect tends to be obtained more favorably. This is presumably because by blending an aromatic ring-containing resin in an amount smaller than that of the cyclopentadiene resin, it becomes easier to realize a state in which it is more compatible with the rubber component in the above mechanism, and thus it becomes easier to improve the high-temperature grip performance. Also, when the second resin amount ≤ the amount of the cyclopentadiene-based resin is deformed, the second resin amount - the amount of the cyclopentadiene-based resin ≤ 0, but "the second resin amount - the amount of the cyclopentadiene-based resin" is preferably -1 or less, more preferably -3 or less, still more preferably -5 or less, and preferably -15 or more, more preferably -12 or more, still more preferably -10 or more. When within the above range, the effect tends to be obtained more favorably. <> In this specification, the second resin amount means the compounding amount (parts by mass) of the second resin with respect to 100 parts by mass of the elastomer component (preferably the rubber component). Similarly, the amount of the cyclopentadiene-based resin means the compounding amount (parts by mass) of the cyclopentadiene-based resin with respect to 100 parts by mass of the elastomer component (preferably the rubber component). <> <>

[0068] <> As the second resin, for example, products of Maruzen Petrochemical Co., Ltd., Sumitomo Bakelite Co., Ltd., Yasuhara Chemical Co., Ltd., Tosoh Corporation, Rutgers Chemicals, BASF, Arizona Chemical, Nippon Paint Co., Ltd., Nippon Shokubai Co., Ltd., JXTG Energy Corporation, Arakawa Chemical Industries, Ltd., Taoka Chemical Industry Co., Ltd., etc. can be used. <> <>

[0069] <> The above composition contains an ester plasticizer. <> The ester plasticizer is not particularly limited as long as it is a compound having an ester group in a liquid state at normal temperature (25°C). Examples include phthalic acid derivatives, long-chain fatty acid derivatives, phosphoric acid derivatives, sebacic acid derivatives, adipic acid derivatives, etc. These may be used alone or in combination of two or more. Among them, phosphoric acid derivatives, sebacic acid derivatives, and adipic acid derivatives are preferred, and sebacic acid derivatives are more preferred. <> The phthalic acid derivative is not particularly limited, and examples thereof include phthalic acid esters such as di-2-ethylhexyl phthalate (DOP) and diisodecyl phthalate (DIDP). The long-chain fatty acid derivative is not particularly limited, and examples thereof include long-chain fatty acid glycerin esters. The phosphoric acid derivative is not particularly limited, and examples thereof include phosphate esters such as tris(2-ethylhexyl) phosphate (TOP) and tributyl phosphate (TBP). The sebacic acid derivative is not particularly limited, and examples thereof include sebacic acid esters such as di(2-ethylhexyl) sebacate (DOS) and diisooctyl sebacate (DIOS). The adipic acid derivative is not particularly limited, and examples thereof include adipic acid esters such as di(2-ethylhexyl) adipate (DOA) and diisooctyl adipate (DIOA). Among them, phosphate esters, sebacic acid esters, and adipic acid esters are preferred, and sebacic acid esters are more preferred. Further, as specific compounds, TOP, DOS, and DOA are preferred, and DOS is more preferred.

[0070] The glass transition temperature (Tg) of the ester plasticizer is preferably -110 °C or higher, more preferably -100 °C or higher, still more preferably -80 °C or higher, and preferably -20 °C or lower, more preferably -40 °C or lower, still more preferably -55 °C or lower. By setting it within the above range, there is a tendency that the above effects can be obtained more suitably. In the present specification, the glass transition temperature is a value measured using a differential scanning calorimeter (Q200) manufactured by TA Instruments Japan Co., Ltd. in accordance with JIS-K7121 under the condition of a temperature rising rate of 10 °C / min.

[0071] As the ester plasticizer, for example, products of Daihachi Chemical Industry Co., Ltd., Tago Chemical Industry Co., Ltd., etc. can be used.

[0072] The content of the ester plasticizer is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, based on 100 parts by mass of the elastomer component (preferably the rubber component), and is preferably 15 parts by mass or less, more preferably 10 parts by mass or less, still more preferably 7 parts by mass or less, particularly preferably 5 parts by mass or less, and most preferably 3 parts by mass or less. When within the above range, the effect tends to be obtained more favorably.

[0073] It is preferable that the amount of the ester plasticizer in the above composition is ≤ the amount of the cyclopentadiene resin. Thereby, the effect tends to be obtained more favorably. This is presumably because when the amount of the ester plasticizer ≤ the amount of the cyclopentadiene resin, it becomes easier to realize the state where the energy loss at high temperature in the above mechanism becomes large, and thus it becomes easier to improve the high-temperature grip performance. Also, when the amount of the ester plasticizer ≤ the amount of the cyclopentadiene resin and it is deformed, the amount of the ester plasticizer - the amount of the cyclopentadiene resin ≤ 0, but the "amount of the ester plasticizer - the amount of the cyclopentadiene resin" is preferably -1 or less, more preferably -3 or less, still more preferably -5 or less, and preferably -8 or more, more preferably -10 or more, still more preferably -15 or more. When within the above range, the effect tends to be obtained more favorably. In this specification, the amount of the ester plasticizer means the blending amount (parts by mass) of the ester plasticizer with respect to 100 parts by mass of the elastomer component (preferably the rubber component). Similarly, the amount of the cyclopentadiene resin means the blending amount (parts by mass) of the cyclopentadiene resin with respect to 100 parts by mass of the elastomer component (preferably the rubber component).

[0074] The above composition may contain a plasticizer other than the above ester plasticizer. Examples of the plasticizer other than the above liquid plasticizer include oil, liquid polymer, and liquid resin. These may be used alone or in combination of two or more. Among them, oil and liquid polymer are preferable.

[0075] Examples of the oil include process oil, vegetable oil, or a mixture thereof. As the process oil, for example, paraffinic process oil, aromatic process oil, naphthenic process oil, etc. can be used. Examples of the vegetable oil include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil, rosin, pine oil, pine tar, tall oil, corn oil, rice bran oil, safflower oil, sesame oil, olive oil, sunflower oil, palm kernel oil, camellia oil, jojoba oil, macadamia nut oil, tung oil, etc. These may be used alone or in combination of two or more. Among them, aromatic process oil is preferred.

[0076] As the oil, for example, products of Idemitsu Kosan Co., Ltd., Sankyo Oil & Chemical Co., Ltd., Japan Energy Corporation, Oryzoi Co., Ltd., H&R Co., Ltd., Toyokuni Oil Co., Ltd., Showa Shell Sekiyu K.K., Fuji Kogyo Co., Ltd., etc. can be used.

[0077] The content of the oil is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, still more preferably 15 parts by mass or more, and preferably 50 parts by mass or less, more preferably 45 parts by mass or less, still more preferably 40 parts by mass or less, based on 100 parts by mass of the elastomer component (preferably the rubber component). When within the above range, the effect tends to be obtained more favorably. Here, in this specification, the content of the oil also includes the amount of the oil contained in the oil-extended rubber. [[ID=I]]

[0078] The liquid polymer is a polymer (preferably a rubber component) in a liquid state at normal temperature (25°C). Examples of the rubber component include the above-mentioned rubber components, which may be used alone or in combination of two or more. Among them, diene rubber is preferred, isoprene rubber, BR, and SBR are more preferred, BR and SBR are still more preferred, and SBR is particularly preferred. Also, farnesene-based polymers are preferred.

[0079] The weight average molecular weight (Mw) of the liquid polymer is preferably 3.0×10 3 or more, more preferably 4.0×10 3as above, preferably 1.0×10 5 or less, more preferably 1.5×10 4 or less, still more preferably 1.0×10 4 or less. When within the above range, the effect can be more suitably obtained.

[0080] As described above, as the liquid polymer, a liquid diene rubber (liquid diene polymer) and a liquid farnesene polymer are preferable. Examples of the liquid diene polymer include a liquid styrene-butadiene copolymer (liquid SBR), a liquid butadiene polymer (liquid BR), a liquid isoprene polymer (liquid IR), and a liquid styrene-isoprene copolymer (liquid SIR). These may be used alone or in combination of two or more. Among them, liquid aromatic polymers such as liquid SBR and liquid SIR are preferable, and liquid SBR is more preferable because the effect can be more suitably obtained. The aromatic polymer means a polymer having an aromatic unit (for example, a unit derived from the aromatic compound).

[0081] The content of the aromatic unit (preferably the amount of styrene) of the liquid aromatic polymer (preferably liquid SBR) is preferably 10% by mass or more, more preferably 20% by mass or more, still more preferably 30% by mass or more, particularly preferably 40% by mass or more, and most preferably 50% by mass or more, and is preferably 80% by mass or less, more preferably 70% by mass or less, still more preferably 60% by mass or less. When within the above range, the effect can be more suitably obtained.

[0082] The liquid farnesene polymer is a polymer obtained by polymerizing farnesene as a monomer component, and examples thereof include the polymers described in JP-A-2016-180118. The liquid farnesene polymer may be a homopolymer of farnesene (farnesene homopolymer) or a copolymer of farnesene and a vinyl monomer (farnesene-vinyl monomer copolymer). These may be used alone or in combination of two or more. Preferred vinyl monomers include styrene and butadiene.

[0083] The liquid polymer is preferably hydrogenated. The hydrogenation rate of the liquid polymer is preferably 20% by mass or more, more preferably 40% by mass or more, still more preferably 60% by mass or more, and is preferably 99% by mass or less, more preferably 90% by mass or less, still more preferably 80% by mass or less. If it is within the above range, the effect can be obtained more preferably.

[0084] As the liquid polymer, for example, products of Cray Valley, Kuraray Co., Ltd. etc. can be used.

[0085] As the liquid polymer, a liquid aromatic polymer having a weight average molecular weight of 10,000 or less is preferable. Thereby, the effect tends to be obtained better. This is because by including a liquid aromatic polymer, in the above mechanism, the elastomer is more plasticized and softened, and it becomes easier to realize a state where the elastomer component is easily compatible and the energy loss at high temperature becomes large. Therefore, it is presumed that the comprehensive performance of high-temperature grip performance and low-temperature grip performance is more likely to be improved. Also, the liquid aromatic polymer is preferably a hydrogenated liquid aromatic polymer.

[0086] The content of the liquid polymer is preferably 1 part by mass or more, more preferably 3 parts by mass or more, with respect to 100 parts by mass of the elastomer component (preferably rubber component), and is preferably 15 parts by mass or less, more preferably 10 parts by mass or less, still more preferably 7 parts by mass or less. If it is within the above range, the effect tends to be obtained better.

[0087] The liquid resin is a resin that is in a liquid state at normal temperature (25°C). The resin is not particularly limited. For example, styrene resins, alkylphenol resins, coumarone-indene resins, terpene resins, rosin resins, acrylic resins, non-hydrogenated dicyclopentadiene resins, dicyclopentadiene-aromatic compound copolymer resins, hydrogenated dicyclopentadiene resins, etc. in a liquid state at normal temperature (25 °C) can be mentioned. These may be used alone or in combination of two or more.

[0088] The above composition contains a filler (preferably a reinforcing filler). The filler (preferably a reinforcing filler) is not particularly limited, and examples thereof include carbon black, silica, calcium carbonate, talc, alumina, clay, aluminum hydroxide, aluminum oxide, mica, etc. These may be used alone or in combination of two or more. Among them, carbon black, silica, and aluminum hydroxide are preferred because the effects can be more preferably obtained. In addition, the combined use of carbon black and aluminum hydroxide, and / or the combined use of silica and aluminum hydroxide are preferred.

[0089] The content of the filler (preferably the total content of carbon black, silica, and aluminum hydroxide) is preferably 100 parts by mass or more, and preferably 160 parts by mass or less, more preferably 150 parts by mass or less, still more preferably 140 parts by mass or less, particularly preferably 135 parts by mass or less, most preferably 130 parts by mass or less, even most preferably 125 parts by mass or less, and still most preferably 120 parts by mass or less, based on 100 parts by mass of the elastomer component (preferably the rubber component). When it is within the above range, the effects tend to be obtained better.

[0090] In the above composition, the amount of the elastomer component ≤ the amount of the filler. When deformed, the amount of the elastomer component - the amount of the filler ≤ 0, but the "amount of the elastomer component - the amount of the filler" is preferably -1 or less, more preferably -3 or less, still more preferably -5 or less, and preferably -40 or more, more preferably -35 or more, still more preferably -30 or more. When it is within the above range, the effects tend to be obtained better. In this specification, the amount of the elastomer component means the compounding amount (parts by mass) of the elastomer component in 100 parts by mass of the composition. Similarly, the amount of the filler means the compounding amount (parts by mass) of the filler in 100 parts by mass of the composition.

[0091] The above composition may contain silica. Thereby, the effect tends to be obtained more favorably. Examples of the silica include dry-process silica (anhydrous silicic acid), wet-process silica (hydrous silicic acid), etc. Wet-process silica is preferred because it has many silanol groups. These may be used alone or in combination of two or more.

[0092] The nitrogen adsorption specific surface area (N2SA) of the silica is preferably 50 m 2 / g or more, more preferably 80 m 2 / g or more, still more preferably 120 m 2 / g or more, particularly preferably 150 m 2 / g or more, most preferably 170 m 2 / g or more, more preferably 180 m 2 / g or more, more preferably 190 m 2 / g or more, more preferably 200 m 2 / g or more, more preferably 210 m 2 / g or more, more preferably 215 m 2 / g or more, more preferably 220 m 2 / g or more, more preferably 225 m 2 / g or more, more preferably 230 m 2 / g or more. Also, the above N2SA is preferably 600 m 2 / g or less, more preferably 300 m 2 / g or less, still more preferably 250 m 2 / g or less, particularly preferably 240 m 2 / g or less. When it is within the above range, the effect tends to be obtained more suitably. In particular, it is preferable to contain fine particle silica having a nitrogen adsorption specific surface area of 170 m 2 / g or more. In addition, in this specification, the N2SA of silica is a value measured by the BET method in accordance with ASTM D3037-81.

[0093] As the silica, for example, products of Degussa, Rhodia, Tosoh Silica Corporation, Solvay Japan K.K., Tokuyama Corporation, etc. can be used.

[0094] The content of silica is preferably 3 to 160 parts by mass with respect to 100 parts by mass of the elastomer component (preferably the rubber component). Among them, when the content of silica in 100% by mass of the filler is 50% by mass or more, the content of silica is preferably 70 parts by mass or more, more preferably 80 parts by mass or more, still more preferably 85 parts by mass or more, particularly preferably 90 parts by mass or more, and preferably 140 parts by mass or less, more preferably 135 parts by mass or less, still more preferably 130 parts by mass or less, particularly preferably 115 parts by mass or less with respect to 100 parts by mass of the elastomer component (preferably the rubber component). When it is within the above range, the effect tends to be more preferably obtained. When the content of carbon black in 100% by mass of the filler is 50% by mass or more, the content of silica is preferably 3 to 40 parts by mass with respect to 100 parts by mass of the elastomer component (preferably the rubber component).

[0095] The above composition may contain carbon black. Thereby, the effect tends to be obtained better. The carbon black is not particularly limited, and examples include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, N762, etc. These may be used alone or in combination of two or more.

[0096] The nitrogen adsorption specific surface area (N2SA) of the carbon black is preferably 30 m 2 / g or more, more preferably 80 m 2 / g or more, still more preferably 100 m 2 / g or more, particularly preferably 120 m 2 / g or more, most preferably 135 m 2 / g or more, and preferably 200 m 2 / g or less, more preferably 180 m 2 / g or less, still more preferably 160 m 2 / g or less. When within the above range, the effect tends to be obtained more favorably. In the present specification, the N2SA of carbon black is a value measured in accordance with JIS K6217-2:2001.

[0097] As the carbon black, for example, products of Asahi Carbon Co., Ltd., Cabot Japan Ltd., Tokai Carbon Co., Ltd., Mitsubishi Chemical Corporation, Lion Corporation, Shin Nippon Carbon Co., Ltd., Columbian Carbon Company, etc. can be used.

[0098] The content of carbon black is preferably 3 to 160 parts by mass with respect to 100 parts by mass of the elastomer component (preferably the rubber component). Among them, when the content of carbon black in 100% by mass of the filler is 50% by mass or more, the content of carbon black is preferably 75 parts by mass or more, more preferably 80 parts by mass or more, still more preferably 85 parts by mass or more, particularly preferably 90 parts by mass or more with respect to 100 parts by mass of the elastomer component (preferably the rubber component), and is preferably 150 parts by mass or less, more preferably 140 parts by mass or less, still more preferably 130 parts by mass or less, particularly preferably 115 parts by mass or less. When within the above range, the effect tends to be obtained more suitably. Further, when the content of silica in 100% by mass of the filler is 50% by mass or more, the content of carbon black is preferably 3 to 40 parts by mass with respect to 100 parts by mass of the elastomer component (preferably the rubber component), and the upper limit is more preferably 20 parts by mass, still more preferably 10 parts by mass.

[0099] The above composition may contain aluminum hydroxide. Thereby, the effect tends to be obtained more favorably. The aluminum hydroxide is not particularly limited, and examples include those known in the tire industry. These may be used alone or in combination of two or more.

[0100] The average primary particle diameter of aluminum hydroxide is preferably 0.5 μm or more, more preferably 0.8 μm or more, preferably 10 μm or less, and more preferably 5 μm or less. When it is within the above range, the effect tends to be more preferably obtained. In the present specification, the average primary particle diameter of aluminum hydroxide is the number average particle diameter and is measured by a transmission electron microscope.

[0101] As the aluminum hydroxide, for example, products of Showa Denko K.K., Hayashi Kasei K.K., etc. can be used.

[0102] The content of aluminum hydroxide is preferably 1 part by mass or more, more preferably 3 parts by mass or more, preferably 15 parts by mass or less, more preferably 12 parts by mass or less, and still more preferably 10 parts by mass or less with respect to 100 parts by mass of the elastomer component (preferably the rubber component). When it is within the above range, the effect tends to be more preferably obtained.

[0103] When the above composition contains silica, it is preferable to further contain a silane coupling agent. The silane coupling agent is not particularly limited. For example, bis(3-triethoxysilylpropyl)tetrasulfide, bis(2-triethoxysilylethyl)tetrasulfide, bis(4-triethoxysilylbutyl)tetrasulfide, bis(3-trimethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, bis(2-triethoxysilylethyl)trisulfide, bis(4-trimethoxysilylbutyl)trisulfide, bis(3-triethoxysilylpropyl)disulfide, bis(2-triethoxysilylethyl)disulfide, bis(4-triethoxysilylbutyl)disulfide, bis(3-trimethoxysilylpropyl)disulfide, bis(2-trimethoxysilylethyl)disulfide, bis(4-trimethoxysilylbutyl)disulfide, 3-trimethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 2-triethoxysilylethyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-triethoxysilylpropyl methacrylate monosulfide, etc. of the sulfide type, 3-mercaptopropyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, etc. of the mercapto type, vinyltriethoxysilane, vinyltrimethoxysilane, etc. of the vinyl type, 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, etc. of the amino type, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, etc. of the glycidoxy type, 3-nitropropyltrimethoxysilane, 3-nitropropyltriethoxysilane, etc. of the nitro type, 3-chloropropyltrimethoxysilane, 3-chloropropyltriethoxysilane, etc. of the chloro type, and the like can be mentioned. As commercially available products, for example, products of Degussa, Momentive, Shin-Etsu Silicone Co., Ltd., Tokyo Chemical Industry Co., Ltd., Azmax Co., Ltd., Toray Dow Corning Co., Ltd., etc. can be used. These may be used alone or in combination of two or more. Among them, sulfide-based silane coupling agents and mercapto-based silane coupling agents are preferred, and mercapto-based silane coupling agents are more preferred because the effects tend to be better obtained.

[0104] In addition, as the mercapto-based silane coupling agent, in addition to the compound having a mercapto group, a compound having a structure in which the mercapto group is protected by a protecting group (for example, the compound represented by the following formula (III)) can also be used.

[0105] Particularly preferred mercapto-based silane coupling agents include a silane coupling agent containing a bonding unit A represented by the following formula (I) and a bonding unit B represented by the following formula (II), and a silane coupling agent represented by the following formula (III). Among them, the silane coupling agent represented by the following formula (III) is preferred.

[0106] Hereinafter, the silane coupling agent containing the bonding unit A represented by the following formula (I) and the bonding unit B represented by the following formula (II) will be described.

Chemical formula

Chemical formula

[0107] In a silane coupling agent containing a bonding unit A represented by formula (I) and a bonding unit B represented by formula (II), the content of the bonding unit A is preferably 30 mol% or more, more preferably 50 mol% or more, preferably 99 mol% or less, and more preferably 90 mol% or less. Further, the content of the bonding unit B is preferably 1 mol% or more, more preferably 5 mol% or more, still more preferably 10 mol% or more, preferably 70 mol% or less, more preferably 65 mol% or less, and still more preferably 55 mol% or less. Further, the total content of the bonding units A and B is preferably 95 mol% or more, more preferably 98 mol% or more, and particularly preferably 100 mol%. Note that the contents of the bonding units A and B are amounts including the case where the bonding units A and B are located at the terminals of the silane coupling agent. The form when the bonding units A and B are located at the terminals of the silane coupling agent is not particularly limited as long as the units corresponding to the formulas (I) and (II) representing the bonding units A and B are formed.

[0108] Regarding R in formulas (I) and (II) 1 Examples of the halogen include chlorine, bromine, and fluorine. Examples of the branched or unbranched alkyl group having 1 to 30 carbon atoms include a methyl group and an ethyl group. Examples of the branched or unbranched alkenyl group having 2 to 30 carbon atoms include a vinyl group and a 1-propenyl group. Examples of the branched or unbranched alkynyl group having 2 to 30 carbon atoms include an ethynyl group and a propynyl group.

[0109] Regarding R in formulas (I) and (II) 2 Examples of the branched or unbranched alkylene group having 1 to 30 carbon atoms include an ethylene group and a propylene group. Examples of the branched or unbranched alkenylene group having 2 to 30 carbon atoms include a vinylene group and a 1-propenylene group. Examples of the branched or unbranched alkynylene group having 2 to 30 carbon atoms include an ethynylene group and a propynylene group.

[0110] In a silane coupling agent containing a bonding unit A represented by the formula (I) and a bonding unit B represented by the formula (II), the total number of repetitions (x + y) of the number of repetitions (x) of the bonding unit A and the number of repetitions (y) of the bonding unit B is preferably in the range of 3 to 300.

[0111] Examples of the silane coupling agent containing the bonding unit A represented by the above formula (I) and the bonding unit B represented by the above formula (II) include NXT-Z15, NXT-Z30, NXT-Z45, NXT-Z80, etc. manufactured by Momentive. These may be used alone or in combination of two or more.

[0112] Hereinafter, the silane coupling agent represented by the following formula (III) will be described. (C p H 2p+1 O)3Si-C q H 2q -S-CO-C k H 2k+1 (III) (In the formula, p is an integer of 1 to 3, q is an integer of 1 to 5, and k is an integer of 5 to 12.)

[0113] p is an integer of 1 to 3, but 2 is preferable. When within the above range, the effect tends to be more suitably obtained.

[0114] q is an integer of 1 to 5, but 2 to 4 are preferable, and 3 is more preferable. When within the above range, the effect tends to be more suitably obtained.

[0115] k is an integer of 5 to 12, but 5 to 10 are preferable, 6 to 8 are more preferable, and 7 is even more preferable. When within the above range, the effect tends to be more suitably obtained.

[0116] Examples of the silane coupling agent represented by the above formula (III) include NXT manufactured by Momentive. The silane coupling agent represented by the above formula (III) may be used alone or in combination of two or more.

[0117] The content of the silane coupling agent is preferably 0.5 parts by mass or more, more preferably 3 parts by mass or more, still more preferably 5 parts by mass or more, and preferably 20 parts by mass or less, more preferably 15 parts by mass or less, still more preferably 10 parts by mass or less, based on 100 parts by mass of silica. When it is within the above range, the effect tends to be obtained more favorably.

[0118] The above composition preferably contains sulfur as a crosslinking agent (vulcanizing agent). Examples of sulfur include powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersed sulfur, soluble sulfur, etc., which are generally used in the rubber industry. These may be used alone or in combination of two or more.

[0119] As sulfur, for example, products of Tsurumi Chemical Industry Co., Ltd., Karuizawa Sulfur Co., Ltd., Shikoku Kasei Kogyo Co., Ltd., Flexsys, Nippon Kankyu Kogyo Co., Ltd., Hosoi Chemical Industry Co., Ltd., etc. can be used.

[0120] The content of sulfur is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, and preferably 5 parts by mass or less, more preferably 3 parts by mass or less, based on 100 parts by mass of the elastomer component (preferably rubber component). When it is within the above range, the effect tends to be obtained more favorably.

[0121] The above composition preferably contains a vulcanization accelerator. Examples of the vulcanization accelerator include thiazole-based vulcanization accelerators such as 2-mercaptobenzothiazole and di-2-benzothiazolyldisulfide; thiuram-based vulcanization accelerators such as tetramethylthiuram disulfide (TMTD), tetrabenzylthiuram disulfide (TBzTD), and tetrakis(2-ethylhexyl)thiuram disulfide (TOT-N); sulfenamide-based vulcanization accelerators such as N-cyclohexyl-2-benzothiazolylsulfenamide, N-tert-butyl-2-benzothiazolylsulfenamide, N-oxyethylene-2-benzothiazole sulfenamide, and N,N'-diisopropyl-2-benzothiazolylsulfenamide; and guanidine-based vulcanization accelerators such as diphenylguanidine, diorthotolylguanidine, and orthotolylbiguanidine. These may be used alone or in combination of two or more. Among them, sulfenamide-based vulcanization accelerators and guanidine-based vulcanization accelerators are preferred, and a combination of sulfenamide-based vulcanization accelerators and guanidine-based vulcanization accelerators may also be used.

[0122] As the vulcanization accelerator, for example, products manufactured by Kawaguchi Chemical Co., Ltd., Ouchi Shinsei Chemical Co., Ltd., Rhein Chemie, etc. can be used.

[0123] The content of the vulcanization accelerator is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, and preferably 10 parts by mass or less, more preferably 8 parts by mass or less, based on 100 parts by mass of the elastomer component (preferably the rubber component). When within the above range, the effect tends to be obtained more favorably.

[0124] The above composition may contain wax. The wax is not particularly limited, and examples include petroleum waxes such as paraffin wax and microcrystalline wax; natural waxes such as vegetable wax and animal wax; and synthetic waxes such as polymers of ethylene, propylene, etc. These may be used alone or in combination of two or more. Among them, petroleum waxes are preferred, and paraffin wax is more preferred.

[0125] As the wax, for example, products of Ouchi Shinko Chemical Industry Co., Ltd., Nippon Seiro Co., Ltd., Seiko Chemical Co., Ltd., etc. can be used.

[0126] The content of the wax is preferably 0.3 parts by mass or more, more preferably 0.5 parts by mass or more, and preferably 20 parts by mass or less, more preferably 10 parts by mass or less, based on 100 parts by mass of the elastomer component (preferably the rubber component). When within the above range, the effect tends to be obtained more favorably.

[0127] The above composition may contain an antioxidant. Examples of the antioxidant include naphthylamine-based antioxidants such as phenyl-α-naphthylamine; diphenylamine-based antioxidants such as octylated diphenylamine and 4,4′-bis(α,α′-dimethylbenzyl)diphenylamine; p-phenylenediamine-based antioxidants such as N-isopropyl-N′-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, and N,N′-di-2-naphthyl-p-phenylenediamine; quinoline-based antioxidants such as polymers of 2,2,4-trimethyl-1,2-dihydroquinoline; monophenol-based antioxidants such as 2,6-di-t-butyl-4-methylphenol and styrenated phenol; bis, tris, polyphenol-based antioxidants such as tetrakis-[methylene-3-(3′,5′-di-t-butyl-4′-hydroxyphenyl)propionate]methane, etc. These may be used alone or in combination of two or more. Among them, p-phenylenediamine-based antioxidants and quinoline-based antioxidants are preferred.

[0128] As the antioxidant, for example, products of Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Industry Co., Ltd., Flexsys, etc. can be used.

[0129] The content of the anti-aging agent is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, and preferably 10 parts by mass or less, more preferably 5 parts by mass or less, based on 100 parts by mass of the elastomer component (preferably the rubber component). When it is within the above range, the effect tends to be obtained more favorably.

[0130] The above composition may contain stearic acid. As the stearic acid, conventionally known ones can be used. For example, products of NOF Corporation, Kao Corporation, FUJIFILM Wako Pure Chemical Corporation, Chiba Fatty Acids Co., Ltd., etc. can be used.

[0131] The content of the stearic acid is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, and preferably 10 parts by mass or less, more preferably 5 parts by mass or less, based on 100 parts by mass of the elastomer component (preferably the rubber component). When it is within the above range, the effect tends to be obtained more favorably.

[0132] The above composition may contain zinc oxide. As the zinc oxide, conventionally known ones can be used. For example, products of Mitsui Mining & Smelting Co., Ltd., Toho Zinc Co., Ltd., Hakusui Tech Co., Ltd., Shoindo Chemical Industry Co., Ltd., Sakai Chemical Industry Co., Ltd., etc. can be used.

[0133] The content of the zinc oxide is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, and preferably 10 parts by mass or less, more preferably 5 parts by mass or less, based on 100 parts by mass of the elastomer component (preferably the rubber component). When it is within the above range, the effect tends to be obtained more favorably.

[0134] It is preferable to blend a processing aid in the above composition. Examples of processing aids include fatty acid metal salts, fatty acid amides, amide esters, silica surfactants, fatty acid esters, mixtures of fatty acid metal salts and amide esters, mixtures of fatty acid metal salts and fatty acid amides, and the like. These may be used alone or in combination of two or more. Among them, it is preferably at least one selected from the group consisting of fatty acid metal salts, amide esters, and mixtures of fatty acid metal salts and amide esters or fatty acid amides, and fatty acid metal salts are more preferred.

[0135] The fatty acid constituting the fatty acid metal salt is not particularly limited, but examples include saturated or unsaturated fatty acids (preferably saturated or unsaturated fatty acids having 6 to 28 carbon atoms (more preferably 10 to 25 carbon atoms, still more preferably 14 to 20 carbon atoms)), such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, arachidic acid, behenic acid, nervonic acid, etc. These can be used alone or as a mixture of two or more. Among them, saturated fatty acids are preferred, and saturated fatty acids having 14 to 20 carbon atoms are more preferred.

[0136] Examples of the metal constituting the fatty acid metal salt include alkali metals such as potassium and sodium, alkaline earth metals such as magnesium, calcium, and barium, zinc, nickel, molybdenum, etc. These may be used alone or in combination of two or more. Among them, zinc and calcium are preferred, and zinc is more preferred.

[0137] Examples of amide esters include fatty acid amide esters containing the above-mentioned saturated or unsaturated fatty acids as constituent components. These may be used alone or in combination of two or more.

[0138] As the fatty acid amide, either a saturated fatty acid amide or an unsaturated fatty acid amide may be used. These may be used alone or in combination of two or more. Examples of the saturated fatty acid amide include N-(1-oxooctadecyl)sarcosine amide, stearic acid amide, behenic acid amide, etc. Examples of the unsaturated fatty acid amide include oleic acid amide, erucic acid amide, etc.

[0139] Specific examples of the mixture of the fatty acid metal salt and the amide ester include Aflux16 manufactured by Rhein Chemie, which is a mixture of a calcium fatty acid salt and an amide ester.

[0140] Specific examples of the mixture of the fatty acid metal salt and the fatty acid amide include WB16 manufactured by Struktol, which is a mixture of calcium fatty acid and fatty acid amide.

[0141] As the processing aid, for example, products of Rhein Chemie, Struktol, etc. can be used.

[0142] The content of the processing aid is preferably 0.5 parts by mass or more, more preferably 2 parts by mass or more, preferably 10 parts by mass or less, and more preferably 6 parts by mass or less, based on 100 parts by mass of the elastomer component (preferably the rubber component). When within the above range, the effect tends to be obtained more favorably.

[0143] In addition to the above components, the above composition may further contain additives generally used in the tire industry, such as organic peroxides; etc. The content of these additives is preferably 0.1 to 200 parts by mass based on 100 parts by mass of the elastomer component (preferably the rubber component).

[0144] The above composition can be produced, for example, by kneading the respective components using a rubber kneading device such as an open roll or a Banbury mixer, and then vulcanizing.

[0145] As kneading conditions, in the base kneading step of kneading additives other than vulcanizing agents and vulcanization accelerators, the kneading temperature is usually 100 to 180°C, preferably 120 to 170°C. In the finishing kneading step of kneading vulcanizing agents and vulcanization accelerators, the kneading temperature is usually 120°C or lower, preferably 80 to 110°C. Further, the composition kneaded with vulcanizing agents and vulcanization accelerators is usually subjected to vulcanization treatment such as press vulcanization. As the vulcanization temperature, it is usually 130 to 190°C, preferably 150 to 185°C. The vulcanization time is usually 5 to 30 minutes.

[0146] The above composition can be used (as a rubber composition for tires) for tire members such as, for example, treads (cap treads), sidewalls, base treads, undertreads, clinches, bead apexes, breaker cushion rubbers, carcass cord coating rubbers, insulations, chafers, inner liners, etc., and side reinforcement layers of run-flat tires. Among them, it is preferably used for treads (cap treads). In the case of a tread composed of a cap tread and a base tread, it can be preferably used for the cap tread.

[0147] The tire of the present invention is manufactured by a usual method using the above composition. That is, a composition blended with various additives as necessary is extruded in an unvulcanized state according to the shape of each member of the tire (especially the tread (cap tread)), molded by a usual method on a tire molding machine, bonded together with other tire members to form an unvulcanized tire, and then heated and pressurized in a vulcanizer to manufacture a tire.

[0148] Note that at least a part of the tread of the above tire may be composed of the above composition, or all of it may be composed of the above composition.

[0149] The above tire is not particularly limited, and examples include pneumatic tires, solid tires, airless tires, etc. Among them, pneumatic tires are preferred.

[0150] The above tire is preferably used as a passenger car tire, a large passenger car tire, a large SUV tire, a truck / bus tire, a motorcycle tire, a racing tire, a winter tire (a studless tire, a snow tire, a stud tire), an all-season tire, a run-flat tire, an aircraft tire, a mining tire, etc. Among them, it is more preferably used as a racing tire. In this specification, a racing tire refers to a tire used for a race such as a kart.

Examples

[0151] The present invention will be specifically described based on the examples, but the present invention is not limited only to these.

[0152] Hereinafter, various chemicals used in the examples and comparative examples will be collectively described. SBR1: SLR6430 manufactured by Trinseo (S-SBR, styrene content: 40% by mass, an oil-extended product containing 37.5% by mass of oil based on 100 parts by mass of the rubber component) SBR2: SBR1502 manufactured by Nippon Zeon Co., Ltd. (non-oil extended, styrene content: 25% by mass) NR: TSR20 (natural rubber) BR: BR730 manufactured by JSR Corporation (rare earth-based BR synthesized using an Nd-based catalyst, cis content: 97% by mass, vinyl content: 0.9% by mass) Thermoplastic elastomer 1: D1161 (SIS) manufactured by Kraton Polymer Thermoplastic elastomer 2: Tough Tech P2000 (SEBS) manufactured by Asahi Kasei Corporation Carbon black: N134 manufactured by Cabot Japan Ltd. (N2SA: 148m 2 / g) Silica: 9100Gr manufactured by Degussa (N2SA: 235m 2 / g) Aluminum hydroxide: Highlight H-43 manufactured by Showa Denko KK (average primary particle size: 1 μm) Ester plasticizer 1: Tris(2-ethylhexyl) phosphate (Tg: -70°C) manufactured by Daihachi Chemical Industry Co., Ltd. Ester plasticizer 2: Di(2-ethylhexyl) sebacate manufactured by Daihachi Chemical Industry Co., Ltd. (Tg: -65°C) Ester plasticizer 3: Di(2-ethylhexyl) adipate manufactured by Daihachi Chemical Industry Co., Ltd. (Tg: -70°C) Resin 1 (hydrogenated dicyclopentadiene-based resin): T-REZ OP501 manufactured by JXTG Energy Corporation (hydrogenated DCPD-based resin, softening point: 140°C, content of units derived from dicyclopentadiene: 100% by mass) Resin 2 (dicyclopentadiene-aromatic compound copolymer resin): Oppera PR-383 manufactured by Exxon Mobil Corporation (aromaticity: 9.6% by mass, softening point: 103°C, Mw: 770) Resin 3 (non-hydrogenated dicyclopentadiene resin): DCPD resin (product code DO443, non-hydrogenated DCPD resin, softening point: 140°C, content of units derived from dicyclopentadiene: 100% by mass) manufactured by Tokyo Chemical Industry Co., Ltd. Resin 4: SYLVARES SA85 manufactured by KRATON Corporation (copolymer of α-methylstyrene and styrene, softening point: 85°C) Liquid polymer: Hydrogenated liquid SBR prepared in the following production example (styrene content: 55% by mass, hydrogenation rate: 70% by mass, weight average molecular weight: 8000) Oil: Diana Process NH-70S (aromatic process oil) manufactured by Idemitsu Kosan Co., Ltd. Wax: Oz Ace Wax manufactured by Nippon Seiro Co., Ltd. Silane coupling agent: NXT manufactured by Momentive (compound with p = 2, q = 3, k = 7 in the silane coupling agent represented by the above formula (III)) Antioxidant 1: Nocrack 6C (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD)) manufactured by Ouchi Shinsei Chemical Industry Co., Ltd. Antioxidant 2: Nocrack RD (2,2,4-trimethyl-1,2-dihydroquinoline polymer) manufactured by Ouchi Shinsei Chemical Industry Co., Ltd. Processing aid: EF44 (zinc salt of saturated fatty acid) manufactured by Struktol Stearic acid: Tsubaki manufactured by NOF Corporation Zinc oxide: Zinc white No. 2 manufactured by Mitsui Mining & Smelting Co., Ltd. Sulfur: HK-200-5 (powder sulfur containing 5% oil) manufactured by Hosoi Chemical Industry Co., Ltd. Vulcanization accelerator 1: Nocceler D (N,N'-diphenylguanidine) manufactured by Ouchi Shinko Chemical Industry Co., Ltd. Vulcanization accelerator 2: Nocceler NS (N-tert-butyl-2-benzothiazolylsulfenamide) manufactured by Ouchi Shinko Chemical Industry Co., Ltd.

[0153] (Production Example) n-Hexane, styrene, butadiene, TMEDA, and n-butyllithium were added to a heat-resistant reaction vessel sufficiently purged with nitrogen, and stirred at 50 °C for 5 hours to carry out a polymerization reaction. Next, while supplying hydrogen gas at a pressure of 0.4 MPa-Gauge and stirring, it was reacted with unreacted polymer terminal lithium to form lithium hydride. The hydrogen gas supply pressure was set to 0.7 MPa-Gauge, the reaction temperature was set to 90 °C, and hydrogenation was carried out using a catalyst mainly composed of titanocene dichloride. When the absorption of hydrogen reached the integrated amount corresponding to the target hydrogenation rate, the reaction temperature was returned to room temperature, the hydrogen pressure was returned to normal pressure, and the reaction solution was withdrawn from the reaction vessel, and the reaction solution was stirred and poured into water to remove the solvent by steam stripping, thereby obtaining a hydrogenated liquid styrene-butadiene rubber.

[0154] (Examples and Comparative Examples) According to the compounding formulations shown in Tables 1 and 2, using a Banbury mixer, chemicals other than sulfur and vulcanization accelerators were kneaded at 165 °C for 4 minutes to obtain a kneaded product. Next, using an open roll, sulfur and vulcanization accelerators were added to the obtained kneaded product, and kneaded at 80 °C for 4 minutes to obtain an unvulcanized rubber composition. The obtained unvulcanized rubber composition was extrusion-molded into the shape of a tread, and laminated together with other tire members on a tire molding machine to form an unvulcanized tire, and press-vulcanized at 150 °C for 10 minutes to obtain a test cart tire (tire size: 11×7.10-5).

[0155] The following evaluations were carried out using the obtained test cart tires. The results are shown in Tables 1 and 2. Note that the reference comparative example in Table 1 was designated as Comparative Example 1-1, and the reference comparative example in Table 2 was designated as Comparative Example 2-1.

[0156] <Low-temperature grip performance> The obtained test cart tire was mounted on a cart, and the difference between the average time of the 1st to 3rd laps and the time of the best lap when traveling 10 laps on a circuit course of about 5 km per lap was measured, and it was indexed with the reference comparative example taken as 100. The larger the index, the smaller the difference between the average time of the 1st to 3rd laps and the time of the best lap, indicating that the low-temperature grip performance (low-temperature grip performance at the initial stage of running) is good. Method of indexing: Difference between the average time of the 1st to 3rd laps and the time of the best lap of the reference comparative example / Difference between the average time of the 1st to 3rd laps and the time of the best lap of each example × 100

[0157] <High-temperature grip performance> The obtained test cart tire was mounted on a cart, and the difference between the average time of the 8th to 10th laps and the time of the best lap when traveling 10 laps on a circuit course of about 5 km per lap was measured, and it was indexed with the reference comparative example taken as 100. The larger the index, the smaller the difference between the average time of the 8th to 10th laps and the time of the best lap, indicating that the high-temperature grip performance (high-temperature grip performance in the latter stage of running) is good. Method of indexing: Difference between the average time of the 8th to 10th laps and the time of the best lap of the reference comparative example / Difference between the average time of the 8th to 10th laps and the time of the best lap of each example × 100

[0158]

Table 1

[0159]

Table 2

[0160] From Tables 1 and 2, it was found that the examples containing an elastomer component, a filler, a cyclopentadiene-based resin, and an ester plasticizer, where the cyclopentadiene-based resin is a hydrogenated dicyclopentadiene-based resin and / or a dicyclopentadiene-aromatic compound copolymer resin and the amount of the elastomer component ≤ the amount of the filler, can improve the comprehensive performance of high-temperature grip performance and low-temperature grip performance (represented by the sum of two indices of high-temperature grip performance and low-temperature grip performance). In addition, it was judged that the comprehensive performance of high-temperature grip performance and low-temperature grip performance is good when each index of high-temperature grip performance and low-temperature grip performance is 100 or more and the sum of the two indices exceeds 200.

[0161] Also, from the comparison between Example 1-1 and Comparative Examples 1-2 to 1-4, and the comparison between Example 2-1 and Comparative Examples 2-2 to 2-4, it was found that the combined use of an ester plasticizer and a dicyclopentadiene-aromatic compound copolymer resin and / or a hydrogenated dicyclopentadiene-based resin can synergistically improve the comprehensive performance of high-temperature grip performance and low-temperature grip performance.

Claims

1. An elastomer component, a filler, a cyclopentadiene-based resin, and an ester plasticizer, wherein the cyclopentadiene-based resin is a hydrogenated dicyclopentadiene-based resin and / or a dicyclopentadiene-aromatic compound copolymer resin, The filler contains silica with a nitrogen adsorption specific surface area of 180 m ２ / g or more, the amount of the elastomer component ≤ the amount of the filler, the amount of the ester plasticizer ≤ the amount of the cyclopentadiene-based resin, the amount of the elastomer component is the compounding amount (parts by mass) of the elastomer component in 100 parts by mass of the composition, the amount of the filler is the compounding amount (parts by mass) of the filler in 100 parts by mass of the composition, the amount of the ester plasticizer is the compounding amount (parts by mass) of the ester plasticizer with respect to 100 parts by mass of the elastomer component, the amount of the cyclopentadiene-based resin is the compounding amount (parts by mass) of the cyclopentadiene-based resin with respect to 100 parts by mass of the elastomer component, a tire composition wherein the content of the ester plasticizer is 0.5 to 3 parts by mass with respect to 100 parts by mass of the elastomer component.

2. An elastomer component, a filler, a cyclopentadiene-based resin, and an ester plasticizer, wherein the cyclopentadiene-based resin is a hydrogenated dicyclopentadiene-based resin and / or a dicyclopentadiene-aromatic compound copolymer resin, the content of carbon black in 100% by mass of the filler is 50% by mass or more, the amount of the elastomer component ≤ the amount of the filler, the amount of the ester plasticizer ≤ the amount of the cyclopentadiene-based resin, the amount of the elastomer component is the compounding amount (parts by mass) of the elastomer component in 100 parts by mass of the composition, the amount of the filler is the compounding amount (parts by mass) of the filler in 100 parts by mass of the composition, the amount of the ester plasticizer is the compounding amount (parts by mass) of the ester plasticizer with respect to 100 parts by mass of the elastomer component, a tire composition wherein the amount of the cyclopentadiene-based resin is the compounding amount (parts by mass) of the cyclopentadiene-based resin with respect to 100 parts by mass of the elastomer component.

3. The tire composition according to claim 1, wherein the content of the silica is 105 to 140 parts by mass with respect to 100 parts by mass of the elastomer component.

4. comprising a second resin different from the cyclopentadiene-based resin, wherein the second resin comprises an aromatic resin, and the tire composition according to any one of claims 1 to 3.

5. The tire composition according to any one of claims 1 to 4, wherein the elastomer component includes styrene-butadiene rubber, isoprene rubber, and butadiene rubber.

6. The tire composition according to any one of claims 1 to 2, 4, and 5, wherein the content of the ester plasticizer is 0.5 to 3 parts by mass with respect to 100 parts by mass of the elastomer component.

7. A tire having a tire member using the composition according to any one of claims 1 to 6.

8. The tire according to claim 7, wherein the tire member is a tread.

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