TIRES

Abstract

[Object] An object of the present invention is to improve overall performance of low fuel consumption and high speed durability. [Solution] There is provided a tire comprising a carcass including a carcass cord, a belt including a belt cord and provided on an outer side of the carcass in a tire radial direction, a band including a band cord and provided on an outer side of the belt in the tire radial direction, and a tread provided on an outer side of the belt in the tire radial direction, wherein the band cord includes a polyethylene terephthalate fiber, the carcass being formed of a carcass cord having a total thickness of more than 2.400 dtex, the tread is formed of a rubber composition containing more than 20 parts by mass of an isoprene-based rubber in 100 parts by mass of a rubber component so as to have a rubber hardness (Shore hardness) Hs of more than 70 Pt, and a sum (Bar + Ber + Car + Trg) of a diameter Bar (mm) of the band cord, a diameter Ber (mm) of the belt cord, a diameter Car (mm) of the carcass cord and a thickness Trg (mm) of the tread is less than 20.

Description

Technical FieldThe present invention relates to a tire.Prior ArtAs disclosed in Japanese Unexamined Patent Publication No. 2022-38812, in a tire for a passenger vehicle, a band (also referred to as a cover layer) is generally provided between a tread and a belt from the viewpoint of preventing deformation of the tire due to centrifugal force during high-speed driving.Citation ListPatent Literature [PTL 1] Japanese Unexamined Patent Publication No. 2022-38812SUMMARY OF THE INVENTIONTechnical ProblemAn object of the present invention is to improve overall performance of low fuel consumption properties and high speed durability.Solution to the ProblemAccording to an embodiment of the present invention, there is provided a tire comprising:a carcass including a carcass cord;a belt including a belt cord and provided on an outer side of the carcass in a tire radial direction;a band including a band cord and provided on an outer side of the belt in the tire radial direction; anda tread provided on an outer side of the belt in the tire radial direction,wherein the ribbon cord contains a polyethylene terephthalate fiber,the carcass is formed from a carcass cord having a total thickness of more than 2,400 dtex,the tread is formed of a rubber composition containing more than 20 parts by mass of an isoprene-based rubber in 100 parts by mass of a rubber component to have a rubber hardness (Shore hardness) Hs of more than 70 Pt, anda sum (Bar+Ber+Car+Trg) of a diameter Bar (mm) of the band cord, a diameter Ber (mm) of the belt cord, a diameter Car (mm) of the carcass cord, and a thickness Trg (mm) of the tread is less than 20.Advantageous Effects of the InventionAccording to the present invention, it is possible to improve the overall performance of low fuel consumption and high-speed durability properties.Brief Description of the DrawingsFIG. 1 is a schematic cross-sectional view for an explanatory description of a structure of a tire according to an embodiment of the present invention.DESCRIPTION OF EMBODIMENTSCharacteristics of Tires According to the Present InventionFirst, characteristics of a tire according to the present invention will be described.1. OverviewA tire according to the present invention includes a carcass including a carcass cord; a belt including a belt cord and provided on an outer side of the carcass in a tire radial direction; a band including a band cord and provided on an outer side of the belt in the tire radial direction; and a tread provided on an outer side of the band in the tire radial direction. In addition, the tape cord contains a polyethylene terephthalate (PET) fiber. Moreover, the carcass is formed from a carcass cord having a total thickness of more than 2,400 dtex. Moreover, the tread is formed of a rubber composition containing more than 20 parts by mass of an isoprene-based rubber in 100 parts by mass of a rubber component so as to have a rubber hardness (Shore hardness) Hs of more than 70 Pt. Further, a sum (Bar+Ber+Car+Trg) of a diameter Bar (mm) of the band cord, a diameter Ber (mm) of the belt cord, a diameter Car (mm) of the carcass cord, and a thickness Trg (mm) of the tread is less than 20.Since these properties are provided, it is considered possible to improve the overall performance of low fuel consumption and high-speed durability properties as described later.Note that, in the present specification, "the cord diameter" in the diameter of the band cord, the diameter of the belt cord, and the diameter of the carcass cord refers to a diameter in a case where a circumscribed circle of a cross section perpendicular to an extending direction of the cord is a perfect circle, and refers to an equivalent circle diameter (a diameter of a circle in a case where a circle having the same cross-sectional area is assumed) in a case of an ellipse or the like. For example, "the diameter of the band cord and the diameter of the carcass cord" of the band cord can be measured in accordance with a method specified in JIS L 1017:2002 "Test methods for chemical fiber tire cords". "The cord diameter of the belt cord" can be measured in accordance with, for example, a test method specified in JIS G 3510:1992 "Testing methods for steel tire cords".2. Mechanism for Showing Effect in Tires of the Present InventionA mechanism for exhibiting the above-described effect in the tire according to the present invention is designed as follows.(1) TapeThe tape may have one layer or two layers. Moreover, the band may be formed over an entire width direction of the tread, or may be formed only in both end portions of the tread. However, it is preferable to use a tape formed over the entire width direction of the tread and a tape formed in both end portions of the tread in the width direction in combination.In the tire according to the present invention, a cord (PET cord) containing PET fibers is used for the band cord.The tape cord may be composed of fibers, and as a fiber constituting the tape cord, a polyester fiber such as a polyethylene terephthalate (PET) fiber or a polyethylene naphthalate (PEN) fiber may be used. The fiber constituting the carcass cord is preferably sustainable PET such as PET recycled from used articles or waste articles (recycled PET) or PET synthesized from biomass (biomass PET). Moreover, the band cord may be a hybrid cord in which a PET fiber and another fiber (aramid fiber or the like) are used in combination.The PET cord has higher rigidity than a nylon 66 cord as described above. Therefore, in a case where the PET cord is used as a band cord, as compared with a case where the nylon 66 cord is used, the cord gauge (the diameter of the band cord) can be made smaller, and the preparation gauge (the thickness of the band) can be made smaller. As a result, the preparation weight (belt weight) can be reduced, the tire weight can be reduced, and LRR can be achieved.(2) Carcass CarcassHowever, as described above, the PET cord has lower resistance to compression fatigue as compared with the nylon 66 cord. Therefore, there is a concern that high-speed durability of the tire may be deteriorated.Therefore, in the tire according to the present invention, first, a carcass formed of a carcass cord having a total thickness of more than 2,400 dtex is used as the carcass.Since the carcass is formed using a carcass cord having a thickness equal to or greater than a certain value, that is, having a total thickness of more than 2,400 dtex, the lateral spring constant can be increased to change (reduce) the degree of deflection generated in a side portion during running, and the strength of the tire can be secured. Therefore, it is considered that the steering stability can be improved and the high-speed durability can also be improved. Note that the total thickness of the carcass cords is more preferably 2,880 dtex or more, and even more preferably 3,340 dtex or more. The upper limit thereof is, for example, preferably 5,000 mm or less, more preferably 4,500 mm or less, and even more preferably 4,400 mm or less.Note that the total thickness of the carcass cords described above can be measured in accordance with a method specified in JIS L 1017:2002.The carcass cord is obtained by twisting one or more filaments of yarn, and is preferably a carcass cord obtained by twisting two filaments of yarn. In a case of a carcass cord obtained by twisting two filaments of yarn, it is preferable that the thickness of each yarn is 1,200 dtex or more, and it is preferable that the thickness thereof is 2,500 dtex or less.The carcass cord may be formed of fibers, and as a fiber constituting the carcass cord, a material publicly known in the art, for example, a polyester fiber such as a polyethylene terephthalate (PET) fiber or a polyethylene naphthalate (PEN) fiber, a polyamide fiber such as a nylon 6 fiber or a nylon 66 fiber, an aramid fiber, or the like, may be used. The fiber constituting the carcass cord may be a material recycled from used articles or waste articles (recycled material), or may be a material synthesized from biomass (biomass material).Moreover, the carcass may have one layer or two layers; however, it is preferred that the carcass has one layer. It is considered that in a case where the carcass is allowed to have a monolayer structure, weight reduction of the tire and LRR can be further achieved compared to a case where a carcass having a two-layer structure is used.Moreover, since such a carcass portion is used, it is possible to sufficiently reduce the bending rigidity in an axial direction, it is possible to sufficiently bend the side portion in a case where a camber angle is applied during turning, and it is possible to allow a tread surface to come into contact with the ground. Therefore, it is considered possible to improve the steering stability.(3) Tread SurfaceNext, in the tire according to the present invention, by using a rubber composition containing more than 20 parts by mass of an isoprene-based rubber in 100 parts by mass of the rubber component, LRRs are obtained by weight reduction of the tire and improvement of high-speed durability also by forming the tread to have a rubber hardness (Shore hardness) Hs of more than 70 Pt. Note that, although the tread may have one layer, two layers, or three or more layers, in a case where the tread has two or more layers, it is preferable that by using a rubber composition containing more than 20 parts by mass of an isoprene-based rubber in 100 parts by mass of the rubber component, the tread is formed such that the layer (topcoat) on a ground contact surface side has a rubber hardness (Shore hardness) Hs of more than 70 pt.Since more than 20 parts by mass of an isoprene-based rubber is contained in 100 parts by mass of the rubber component, the tread can be allowed to have low exothermicity, which makes it possible to reduce heat generation during high-speed running. Therefore, it is assumed that LRR can be achieved. Moreover, it is considered that high-speed durability can be improved because it is possible to suppress the decrease in rigidity (modulus) of the PET cord generated in accordance with the temperature rise of the tread. The mixing amount of the isoprene-based rubber is preferably 30 parts by mass or more, more preferably 40 parts by mass or more, and even more preferably 50 parts by mass or more in 100 parts by mass of the rubber component. The upper limit thereof is, for example, preferably 70 parts by mass or less, and more preferably 60 parts by mass or less.In this case, in a case where the rubber hardness (Shore hardness) Hs of the tread is small, thus the rubber is soft, the deformation amount of the tread increases during high-speed running, the compression applied to the belt increases, and thus there is a concern that high-speed durability may deteriorate due to compression fatigue. In the present invention, therefore, the rubber hardness (Shore hardness) Hs of the tread is set to be more than 70 pt.This makes it possible to suppress deformation of the tread during high-speed driving by securing sufficient rigidity. Therefore, it is considered that the compression fatigue applied to the belt can be reduced to improve the high-speed durability. Further, by securing the rigidity of the tread, it is possible to suppress the deformation of the tread during bending, thereby easily transmitting the generated force. Therefore, it is possible to ensure the steering stability. The rubber hardness (Shore hardness) Hs of the tread is preferably more than 71 pt, more preferably more than 73 pt, and even more preferably more than 75 pt. The upper limit thereof is, for example, preferably 85 pt or less, more preferably 80 pt or less, and even more preferably 77 pt or less.Note that the rubber hardness (Shore hardness) Hs described above can be measured in accordance with a method specified in JIS K 6253-3:2012 using a type A durometer.(4) Bar + Ber + Car + TrgIn the present invention, a sum (Bar+Ber+Car+Trg) of a diameter Bar (mm) of the band cord, a diameter Ber (mm) of the belt cord, a diameter Car (mm) of the carcass cord, and a thickness Trg (mm) of the tread is controlled to be less than 20. As a result, it is considered that the effects due to the use of the PET cord, the structure of the carcass, and the properties of the rubber composition for a tread described above cooperate with each other to be exhibited, and the overall performance of low fuel consumption properties and high-speed durability properties can be improved. The sum (Bar+Ber+Car+Trg) is more preferably 18 or less, even more preferably 15 or less, and even more preferably 12.13 or less. The lower limit thereof is, for example, preferably 8 or more, more preferably 8.77 or more, even more preferably 10.52 or more, and even more preferably 11.04 or more.[2] Preferred AspectsFurther effects can be obtained by using the following aspects.1. Tape cordIn the present invention, as described above, the PET cord is used as a band cord. However, it is preferable to use a PET cord containing lasting PET fibers. The sustainable PET fiber is a fiber containing a sustainable material, such as regenerated PET or biomass PET. Note that, in the present specification, among the specific materials (for example, PET), a material obtained by recycling used articles or waste articles or a material obtained by using biomass as a raw material is referred to as a sustainable material (for example, sustainable PET).Note that although the diameter (cord diameter) of the band cord is preferably small for weight reduction of the tire, it is preferably 0.2 mm or more, more preferably 0.3 mm or more, and even more preferably 0.4 mm or more. The upper limit thereof is, for example, preferably 0.9 mm or less, more preferably 0.7 mm or less, even more preferably 0.66 mm or less, and even more preferably 0.54 mm or less. Moreover, the total thickness of the band cord is preferably 1.000 dtex or more, more preferably 1,500 dtex or more, and even more preferably 2,000 dtex or more. The upper limit thereof is, for example, preferably 5,000 dtex or less, more preferably 4,500 dtex or less, and even more preferably 4,000 dtex or less.2. BeltThe belt may have one layer, two layers, or three or more layers.The belt cord constituting the belt is preferably a steel cord from the viewpoint of weight reduction of the tire, and a cord composed of plural filaments is preferred from the viewpoint of weight reduction of the tire. The cord may be a twisted line obtained by twisting a plurality of filaments. The number of filaments constituting the cord is preferably 1 or more and 8 or less, and more preferably 1 or more and 4 or less. Note that the lower limit thereof is preferably two or more, for example. In the case of a belt cord having the number of filaments of one or more and four or less, the twisting may be simple twisting (for example, a 1×2 structure) or ply twisting (for example, a 2+2 structure), or a non-twisted (non-twisted) belt cord may be used. The material of the filament constituting the belt cord is preferably a metal, and more preferably iron. The filament constituting the belt cord may have a circular or elliptical cross section; however, a circular cross section is preferable, and the filament may be wavy or may be treated with plating. Moreover, the diameter (cord diameter) of the belt cord for weight reduction of the tire is preferably small, and more preferably 0.2 mm or more, further preferably 0.3 mm or more, and still further preferably 0.59 mm or more. The upper limit thereof is, for example, preferably 0.9 mm or less, more preferably 0.8 mm or less, even more preferably 0.7 mm or less, and even more preferably 0.65 mm or less.3. Tire Weight and Maximum Load CapacityThe ratio of the tire weight (kg) to the maximum load capacity (kg) of the tire (tire weight / maximum load capacity) is preferably less than 0.02, more preferably 0.017 or less, even more preferably 0.015 or less, even more preferably less than 0.015, even more preferably 0.012 or less, even more preferably less than 0.012, even more preferably 0.011 or less, and particularly preferably less than 0.009. The lower limit thereof is, for example, preferably 0.008 or more.The tire weight can be reduced, for example, by reducing the thickness of various cords (band cords, belt cords and carcass cords) constituting the tire members, reducing the thickness of the tread or sidewall, or reducing the density of the rubber composition used for them.As compared with the maximum load capacity of the tire, the thickness of the rubber is relatively thin in the tire having a tire weight as described above. Therefore, it is considered that it is possible to reduce the deformation amount by sufficiently suppressing a temperature rise of the entire tire, and it is possible to further improve the durability of the tire during traveling, and it is possible to achieve both the advantages of LRR and high-speed durability by weight reduction. Note that, above, the "tire weight (kg)" refers to a weight of a tire as a simple body itself that does not include the weight of the rim.Moreover, in a case where a tire cross-sectional width is referred to as Wt (mm), a tire cross-sectional height is referred to as Ht (mm), and a tire outer diameter is referred to as Dt (mm), and measured in a normal state, the "maximum load capacity (kg)" may be determined as WL according to the following expression. In the following expression, V is a virtual volume (mm 3) of the tire. Here, the tire cross-sectional width Wt is a maximum width between outer surfaces of the sidewall except a tread or text on a side surface of the tire in a normal state in a case where the tread or text is present thereon. Moreover, the tire cross-sectional height Ht is 1 / 2 of the difference between the outer diameter of the tire and a rim diameter.In the above description, the term "normal state" refers to a state in which the tire has been subjected to rim mounting on a normal rim, a normal internal pressure has been applied, and moreover, there is no load. Note that the term "normal internal pressure" refers to air pressure defined for each tire by any standard in a standard system including the standard on which the tire is based, refers to "maximum air pressure" in a case of the Japan Automobile Tire Manufacturers Association, Inc. (JATMA), refers to "INFLATION PRESSURE" in a case of the European Tire and Rim Technical Organization (ETRTO), and refers to "INFLATION PRESSURE" in a case of the Tire and Rim Association, Inc. refers to the maximum value described in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES". (TRA). Here, as in the case of the normal rim, JATMA, ETRTO, and TRA are referred to in this order following a standard regarding an applicable size in a case where there is an applicable size in a case of referencing. In a case of a tire not defined in the standard, the normal internal pressure refers to a normal internal pressure (which is 250 kPa or more) with respect to another tire size (which is defined in the standard) described for the above-described normal rim as a standard rim. Note that, in a case where a plurality of normal internal pressures of 250 kPa or more are described, the minimum value is referred to below.It should be noted that the term "normal rim" is a rim defined for each tire by a standard in a standard system including the standard on which the tire is based. For example, in a case of JATMA, it refers to a standard rim with respect to the applicable size described in "JATMA YEAR BOOK", in a case of ETRTO, it refers to "Measuring Rim" described in "STANDARDS MANUAL", or in a case of TRA, it refers to "Design Rim" described in "YEAR BOOK". Here, JATMA, ETRTO, and TRA are referred to in this order following a standard regarding an applicable quantity in a case where there is an applicable quantity in a case of referencing. Moreover, the normal rim refers to a rim capable of rim-mounting a tire in a case where the tire is not defined in the standard, wherein an internal pressure can be maintained, that is, a rim having the smallest rim diameter and then a rim having the narrowest rim width among rims that do not cause air leakage between a rim and a tire.4. Material of carcass cordThe material of the carcass cord is not particularly limited; however, it is preferably a cord (PET cord) containing PET fibers, and it is further preferred to contain lasting PET fibers. The sustainable PET fiber contains a sustainable material, such as regenerated PET or biomass PET. Since the PET cord has high rigidity as compared with the nylon 66 cord, high-speed durability can be improved by using the PET cord as a carcass cord. Moreover, in a case where the PET cord is compared with the nylon 66 cord having an equivalent restraining force, the cord diameter is reduced. Therefore, the use of the PET cord reduces the tire weight, making it possible to achieve LRR by weight reduction.5. Diameter Car of carcass cordThe diameter (cord diameter) of the carcass cord is preferably small for weight reduction of the tire, and is more preferably 0.2 mm or more, further preferably 0.4 mm or more, still further preferably 0.55 mm or more, and still further preferably 0.68 mm or more. The upper limit thereof is, for example, preferably 0.9 mm or less, more preferably 0.8 mm or less, and even more preferably 0.78 mm or less.6. Thickness Trg of treadThe thickness of the tread is preferably 4 mm or more, more preferably 6 mm or more, even more preferably 6.5 mm, and even more preferably 8 mm or more. This makes it possible to reduce the compression applied to the belt. Therefore, the resistance to compression fatigue can be improved to improve the high-speed durability. Note that in a case where the thickness of the tread is too large, the tire weight increases, and thus the LRR effect is canceled due to the weight reduction of the tire member other than the tread. Moreover, the rigidity of the tire can be reduced, and thus the steering stability may be likely to be deteriorated. The upper limit thereof is therefore preferably 20 mm or less, more preferably 15 mm or less, and even more preferably 10 mm or less.The thickness of the tread refers to the thickness of the tread on a tire equatorial plane in a cross section in a tire radial direction, is the thickness of the rubber composition in a case where the tread is formed of a single rubber composition, refers to the total thickness of these layers in a case where the tread is formed of a laminated structure of multiple rubber compositions, and can be measured by adjusting a bead portion to be in a state of matching with the normal rim width in a cross section obtained by cutting the tire in the radial direction.[3] EmbodimentsHereinafter, the present invention will be specifically described based on the embodiments.1. Tire According to Present EmbodimentFIG. 1 is a schematic cross-sectional view for an explanatory description of a structure of the tire according to the present embodiment. In FIG. 1, an up-down direction is the radial direction of the tire, a left-right direction is a rotation shaft direction of the tire, and a direction perpendicular to a paper surface is a circumferential direction of the tire. Note that, in FIG. 1, a broken line CL indicates an equatorial plane of the tire. It is to be noted that since the shape of the tire except for the tread pattern is symmetrical with respect to the equatorial plane, 1 / 4 of the entire tire is shown in Fig. 1.As illustrated in FIG. 1, a tire 1 includes a tread 2, a pair of sidewalls 3, a pair of chafers 4, a pair of beads 5, an inner liner 6, a carcass 7, a belt 8, a pair of fillers 9, and a band 10, and the carcass 7, the belt 8, the band 10, and the tread 2 are arranged from the inside to the outside in the tire radial direction.With such a configuration, it is possible to improve the overall performance of low fuel consumption properties and high-speed durability by appropriately forming the tread and the carcass as described above by using a cord obtained by twisting a filament of yarn containing a PET fiber as a band cord, and further appropriately controlling a sum (Bar+Ber+Car+Trg) of a diameter Bar (mm) of the band cord, a diameter Ber (mm) of the belt cord, a diameter Car (mm) of the carcass cord, and a thickness Trg (mm) of the tread.2. Rubber composition for treadIn the present embodiment, the rubber composition for a tread can be obtained by kneading various blending materials such as a rubber component, a filler (a reinforcing material), a softening component (an oil, a resin component, or the like), and an antioxidant.(1) Mixed Material(a) Rubber componentAs the rubber component, an isoprene-based rubber such as natural rubber (NR) may be used alone. However, an isoprene-based rubber and a diene-based rubber other than the isoprene-based rubber may be used in combination. For example, it is possible to use a diene-based rubber such as a styrene-butadiene rubber (SBR), a butadiene rubber (SBR), an acrylonitrile-butadiene rubber (NBR), a chloroprene rubber (CR), or a butyl rubber (IIR) as the diene-based rubber other than the isoprene-based rubber. However, two kinds (NR and SBR or NR and BR) may be used in combination, or three kinds (NR, SBR and BR) may be used in combination.(a-1) Isoprene-based rubberAs the isoprene-based rubber, a natural rubber (NR) and a synthetic polyisoprene rubber or the like, such as an isoprene-based rubber other than NR (a reformulated natural rubber (reformulated NR), a modified natural rubber (modified NR), synthetic polyisoprene (isoprene rubber (IR)), or a modified isoprene rubber (modified IR)), can be used.As the NR, it is possible to use those common in the tire industry, for example, SVR-L, SIR20, RSS#3 and TSR20. The NR has excellent strength as compared with other rubbers.The content of NR in 100 parts by mass of the rubber component is more than 20 parts by mass, and is preferably 30 parts by mass or more, and more preferably 40 parts by mass or more. The upper limit is preferably 70 parts by mass or less, more preferably 60 parts by mass or less, and even more preferably 50 parts by mass or less.Examples of the isoprene-based rubber other than NR include an isoprene rubber (IR), a reformulated NR, a modified NR, and a modified IR. The IR is not particularly limited, and it is possible to use those common in the tire industry, for example, IR 2200 manufactured by Zeon Corporation. Examples of the reformulated NR include deproteinized natural rubber (DPNR) and high purity natural rubber (UPNR), examples of the modified NR include epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), and grafted natural rubber, and examples of the modified IR include epoxidized isoprene rubber, hydrogenated isoprene rubber, and grafted isoprene rubber. These may be used alone, or two or more kinds thereof may be used in combination.The upper limit of the content of the isoprene-based rubber in 100 parts by mass of the rubber component is preferably 100 parts by mass or less, more preferably 90 parts by mass or less, even more preferably 80 parts by mass or less, even more preferably 70 parts by mass or less, and particularly preferably 60 parts by mass or less.(a-2) SBRThe weight average molecular weight of SBR is, for example, greater than 100,000 and less than 2,000,000. The styrene content of the SBR is preferably more than 5 mass %, more preferably more than 10 mass %, and even more preferably more than 15 mass %. On the other hand, it is preferably less than 40 mass %, more preferably less than 35 mass %, and even more preferably less than 30 mass %. The vinyl content (the amount of the 1,2-bonded butadiene unit) of the SBR is preferably more than 5 mass %, more preferably more than 10 mass %, and even more preferably more than 15 mass %. On the other hand, it is preferably less than 70 mass %, more preferably less than 40 mass %, and even more preferably less than 30 mass %. Note that the identification of the structure of the SBR (the measurement of styrene content and vinyl content) can be performed by using, for example, a JNM-ECA series apparatus manufactured by JEOL Ltd.The SBR is not particularly limited, and it is possible to use, for example, an emulsified polymerized styrene-butadiene rubber (E-SBR) or a solution polymerized styrene-butadiene rubber (S-SBR). The SBR may be an unmodified SBR or a modified SBR. Moreover, a hydrogenated SBR obtained by hydrogenating a butadiene portion in the SBR can be used. The hydrogenated SBR can be obtained by subsequently hydrogenating the BR portion in the SBR, or a similar structure can be obtained by copolymerizing styrene, ethylene and butadiene.The modified SBR is preferably an SBR having a functional group that interacts with a filler such as silica. Examples thereof include an end-modified SBR obtained by modifying at least one end of the SBR with a compound (a modifier) having the above-described functional group (an end-modified SBR having the above-described functional group at the end), a main chain-modified SBR having the above-described functional group in the main chain, a main chain / end-modified SBR having the above-described functional group in the main chain and at the end (for example, a main chain / end-modified SBR in which the above-described functional group is provided in the main chain and at least one end is modified with the above-described modifier), and an end-modified SBR capable of modifying (coupling) with a polyfunctional compound, having two or more epoxy groups in the molecule and introducing a hydroxyl group or an epoxy group therein.Examples of the 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, and an epoxy group. It should be noted that these functional groups may have a substituent.Moreover, as the modified SBR, it is possible to use, for example, an SBR modified with a compound (modifier) represented by the following formula.Note that, in the formula, R 1, R 2 and R 3 are the same as or different from each other, representing an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group (-COOH), a mercapto group (-SH), or a derivative thereof. R 4 and R 5 are the same as or different from each other, representing a hydrogen atom or an alkyl group. R 4 and R 5 may be bonded together to form a ring structure together with the nitrogen atom. Here, n represents an integer.As the modified SBR modified with a compound (modifier) represented by the above formula, it is possible to use an SBR (the modified SBR or the like described in Japanese Unexamined Patent Publication No. 2010-111753) obtained by subjecting a polymerization end (active end) of a solution-polymerized styrene-butadiene rubber (S-SBR) modified with a compound represented by the above formula.R 1, R 2 and R 3 are suitably an alkoxy group (preferably an alkoxy group having 1 to 8 carbon atoms, and more preferably an alkoxy group having 1 to 4 carbon atoms). R 4 and R 5 are suitably an alkyl group (preferably an alkyl group having 1 to 3 carbon atoms). Here, n is preferably 1 to 5, more preferably 2 to 4, and even more preferably 3. Moreover, in a case where R 4 and R 5 are bonded to each other to form a ring structure together with the nitrogen atom, the ring structure is preferably a 4-8 membered ring. Note that the alkoxy group also contains a cycloalkoxy group (a cyclohexyloxy group or the like) and an aryloxy group (a phenoxy group, a benzyloxy group or the like).Specific examples of the modifier include 2-dimethylaminoethyltrimethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 2-dimethylaminoethyltriethoxysilane, 3-dimethylaminopropyltriethoxysilane, 2-diethylaminoethyltrimethoxysilane, 3-diethylaminopropyltrimethoxysilane, 2-diethylaminoethyltriethoxysilane, and 3-diethylaminopropyltriethoxysilane. These may be used alone, or two or more kinds thereof may be used in combination.Moreover, as the modified SBR, a modified SBR modified with the following compound (modifier) can also be used. Examples of the modifier include a polyglycidyl ether of polyhydric alcohol such as ethylene glycol diglycidyl ether, glycerol triglycidyl ether, trimethylolethane triglycidyl ether or trimethylolpropane triglycidyl ether; a polyglycidyl ether of an aromatic compound having two or more phenol groups such as diglycidylated bisphenol A; a polyepoxide compound such as 1,4-diglycidylbenzene, 1,3,5-triglycidylbenzene or a polyepoxided liquid polybutadiene; epoxy group-containing tertiary amines such as 4,4'-diglycidyldiphenylmethylamine or 4,4'-diglycidyldibenzylmethylamine; a diglycidylamino compound such as diglycidylaniline, N,N'-diglycidyl-4-glycidyloxyaniline, diglycidyl orthotolueneidine, tetraglycidyl methoxylenidamine, tetraglycidylaminodiphenylmethane, tetraglycidyl-p-phenylenediamine, diglycidyl aminomethylcyclohexane or tetraglycidyl-1,3-bisaminomethylcyclohexane; an amino group-containing acid chloride such as bis(1-methylpropyl)carbamic acid chloride, 4-morpholinecarbonyl chloride, 1-pyrrolidinecarbonyl chloride, N,N-dimethylcarbamic acid chloride or N,N-diethylcarbamic acid chloride; an epoxy group-containing silane compound such as 1,3-bis(glycidyloxypropyl)tetramethyldisiloxane or (3-glycidyloxypropyl)pentamethyldisiloxane; a sulfide group-containing silane compound such as (trimethylsilyl)[3-(trimethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(triethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(tripropoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(tributoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldimethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldiethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldipropoxysilyl)propyl]sulfide, or (trimethylsilyl)[3-(methyldibutoxysilyl)propyl]sulfide; an N-substituted aziridine compound such as ethylenimine or propyleneimine; an alkoxysilane such as methyltriethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltrimethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltriethoxysilane, N,N-bis(trimethylsilyl)aminoethyltrimethoxysilane or N,N-bis(trimethylsilyl)aminoethyltriethoxysilane; a (thio)benzophenone compound having an amino group and / or a substituted amino group such as 4-N,N-dimethylaminobenzophenone, 4-N,N-di-t-butylaminobenzophenone, 4-N,N-diphenylaminobenzophenone, 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)benzophenone, 4,4'-bis(diphenylamino)benzophenone or N,N,N',N'-bis(tetraethylamino)benzophenone; a benzaldehyde compound having an amino group and / or a substituted amino group, such as 4-N,N-dimethylaminobenzaldehyde, 4-N,N-diphenylaminobenzaldehyde or 4-N,N-divinylaminobenzaldehyde; an N-substituted pyrrolidone, such as N-methyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-phenyl-2-pyrrolidone, N-t-butyl-2-pyrrolidone or N-methyl-5-methyl-2-pyrrolidone; an N-substituted piperidone, such as N-methyl-2-piperidone, N-vinyl-2-piperidone or N-phenyl-2-piperidone; and an N-substituted lactam, such as, for example, N-methyl-.epsilon.-caprolactam, N-phenyl-.epsilon.-caprolactam, N-methyl-.omega.-laurolactam, N-vinyl-.omega.-laurolactam, N-methyl-.beta.-propiolactam or N-phenyl-.beta.-propiolactam; and N,N-bis-(2,3-epoxypropoxy)aniline, 4,4-methylenebis-(N,N-glycidylaniline), tris-(2,3-epoxypropyl)-1,3,5-triazine-2,4,6-trione, N,N-diethylacetamide, N-methylmaleimide, N,N-diethylurea, 1,3-dimethylethyleneurea, 1,3-divinylethyleneurea, 1,3-diethyl-2-imidazolidinone, 1-methyl-3-ethyl-2-imidazolidinone, 4-N,N-dimethylaminoacetophenone, 4-N,N-diethylaminoacetophenone, 1,3-bis(diphenylamino)-2-propanone and 1,7-bis(methylethylamino)-4-heptanone. Note that the modification with the above compound (modifier) can be carried out by a publicly known method.As the SBR, it is possible to use an SBR manufactured and sold by, for example, Sumitomo Chemical Co., Ltd., ENEOS Materials Corporation, Asahi Kasei Corporation, or Zeon Corporation. Note that the SBR may be used alone or two or more kinds thereof may be used in combination.The content of SBR in 100 parts by mass of the rubber component is preferably 10 parts by mass or more, more preferably 25 parts by mass or more, and even more preferably 40 parts by mass or more. The upper limit thereof is preferably 70 parts by mass or less, more preferably 60 parts by mass or less, and even more preferably 55 parts by mass or less.(a-3) BRThe weight average molecular weight of BR is, for example, more than 100,000 and less than 2,000,000. The vinyl content of BR is, for example, more than 1 mass % and less than 30 mass %. The cis content of BR is, for example, more than 1 mass % and 98 mass % or less. The trans amount of BR is more than 1 mass % and less than 60 mass %. Note that the cis content can be measured according to an infrared absorption spectrum analysis method.The BR is not particularly limited, and it is possible to use a BR having a high cis content (the cis content is 90% or more), a BR having a low cis content, a BR containing a syndiotactic polybutadiene crystal, or the like. The BR may be an unmodified BR or a modified BR, and as the modified BR, it is possible to use, for example, a BR modified with a compound (modifier) represented by the following formula.Note that, in the formula, R 1, R 2 and R 3 are the same as or different from each other, representing an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group (-COOH), a mercapto group (-SH), or a derivative thereof. R 4 and R 5 are the same as or different from each other, representing a hydrogen atom or an alkyl group. R 4 and R 5 may be bonded together to form a ring structure together with the nitrogen atom. Here, n represents an integer.Examples of the modified BR modified with a compound (modifier) represented by the above formula include a BR obtained by subjecting a polymerization terminal (active terminal) to modification with the compound represented by the above formula.R 1, R 2 and R 3 are suitably an alkoxy group (preferably an alkoxy group having 1 to 8 carbon atoms, and more preferably an alkoxy group having 1 to 4 carbon atoms). R 4 and R 5 are suitably an alkyl group (preferably an alkyl group having 1 to 3 carbon atoms). Here, n is preferably 1 to 5, more preferably 2 to 4, and even more preferably 3. Moreover, in a case where R 4 and R 5 are bonded to each other to form a ring structure together with the nitrogen atom, the ring structure is preferably a 4-8 membered ring. Note that the alkoxy group also contains a cycloalkoxy group (a cyclohexyloxy group or the like) and an aryloxy group (a phenoxy group, a benzyloxy group or the like).Specific examples of the modifier include 2-dimethylaminoethyltrimethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 2-dimethylaminoethyltriethoxysilane, 3-dimethylaminopropyltriethoxysilane, 2-diethylaminoethyltrimethoxysilane, 3-diethylaminopropyltrimethoxysilane, 2-diethylaminoethyltriethoxysilane, and 3-diethylaminopropyltriethoxysilane. These may be used alone, or two or more kinds thereof may be used in combination.Moreover, as the modified BR, a modified BR modified with the following compound (modifier) may also be used. Examples of the modifier include a polyglycidyl ether of polyhydric alcohol such as ethylene glycol diglycidyl ether, glycerol triglycidyl ether, trimethylolethane triglycidyl ether or trimethylolpropane triglycidyl ether; a polyglycidyl ether of an aromatic compound having two or more phenol groups such as diglycidylated bisphenol A; a polyepoxide compound such as 1,4-diglycidylbenzene, 1,3,5-triglycidylbenzene or a polyepoxided liquid polybutadiene; epoxy group-containing tertiary amines such as 4,4'-diglycidyldiphenylmethylamine or 4,4'-diglycidyldibenzylmethylamine; a diglycidylamino compound such as diglycidylaniline, N,N'-diglycidyl-4-glycidyloxyaniline, diglycidyl orthotolueneidine, tetraglycidyl methoxylenidamine, tetraglycidylaminodiphenylmethane, tetraglycidyl-p-phenylenediamine, diglycidyl aminomethylcyclohexane or tetraglycidyl-1,3-bisaminomethylcyclohexane; an amino group-containing acid chloride such as bis(1-methylpropyl)carbamic acid chloride, 4-morpholinecarbonyl chloride, 1-pyrrolidinecarbonyl chloride, N,N-dimethylcarbamic acid chloride or N,N-diethylcarbamic acid chloride; an epoxy group-containing silane compound such as 1,3-bis(glycidyloxypropyl)tetramethyldisiloxane or (3-glycidyloxypropyl)pentamethyldisiloxane; a sulfide group-containing silane compound such as (trimethylsilyl)[3-(trimethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(triethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(tripropoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(tributoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldimethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldiethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldipropoxysilyl)propyl]sulfide, or (trimethylsilyl)[3-(methyldibutoxysilyl)propyl]sulfide; an N-substituted aziridine compound such as ethylenimine or propyleneimine; an alkoxysilane such as methyltriethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltrimethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltriethoxysilane, N,N-bis(trimethylsilyl)aminoethyltrimethoxysilane or N,N-bis(trimethylsilyl)aminoethyltriethoxysilane; a (thio)benzophenone compound having an amino group and / or a substituted amino group such as 4-N,N-dimethylaminobenzophenone, 4-N,N-di-t-butylaminobenzophenone, 4-N,N-diphenylaminobenzophenone, 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)benzophenone, 4,4'-bis(diphenylamino)benzophenone or N,N,N',N'-bis(tetraethylamino)benzophenone; a benzaldehyde compound having an amino group and / or a substituted amino group, such as 4-N,N-dimethylaminobenzaldehyde, 4-N,N-diphenylaminobenzaldehyde or 4-N,N-divinylaminobenzaldehyde; an N-substituted pyrrolidone, such as N-methyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-phenyl-2-pyrrolidone, N-t-butyl-2-pyrrolidone or N-methyl-5-methyl-2-pyrrolidone; an N-substituted piperidone, such as N-methyl-2-piperidone, N-vinyl-2-piperidone or N-phenyl-2-piperidone; and an N-substituted lactam, such as, for example, N-methyl-.epsilon.-caprolactam, N-phenyl-.epsilon.-caprolactam, N-methyl-.omega.-laurolactam, N-vinyl-.omega.-laurolactam, N-methyl-.beta.-propiolactam or N-phenyl-.beta.-propiolactam; and N,N-bis-(2,3-epoxypropoxy)aniline, 4,4-methylenebis-(N,N-glycidylaniline), tris-(2,3-epoxypropyl)-1,3,5-triazine-2,4,6-trione, N,N-diethylacetamide, N-methylmaleimide, N,N-diethylurea, 1,3-dimethylethyleneurea, 1,3-divinylethyleneurea, 1,3-diethyl-2-imidazolidinone, 1-methyl-3-ethyl-2-imidazolidinone, 4-N,N-dimethylaminoacetophenone, 4-N,N-diethylaminoacetophenone, 1,3-bis(diphenylamino)-2-propanone and 1,7-bis(methylethylamino)-4-heptanone. Note that the modification with the above compound (modifier) can be carried out by a publicly known method. Note that these modified BRs may be used alone or two or more kinds thereof may be used in combination.As the BR, it is possible to use a product manufactured by, for example, UBE Corporation, ENEOS Materials Corporation, Asahi Kasei Corporation, or Zeon Corporation.The upper limit of the content of BR in 100 parts by mass of the rubber component is preferably 30 parts by mass or less, more preferably 15 parts by mass or less, and even more preferably 5 parts by mass or less.(a-4) Another rubber componentThe rubber composition may contain, as needed, as another rubber component, rubber (a polymer) that is commonly used in the production of tires, such as nitrile rubber (NBR).Note that the raw material (monomer) of the above-described synthetic rubber such as IR, SBR, and BR may be a raw material derived from an underground resource such as petroleum or natural gas, or may be a raw material recycled from a rubber product such as a tire or a non-rubber product such as polystyrene.The monomer (recycled monomer) obtained by recycling is not particularly limited, and examples thereof include polyisoprene derived from recycling, butadiene derived from recycling, and aromatic vinyl derived from recycling. Examples of the butadiene include 1,2-butadiene and 1,3-butadiene. The aromatic vinyl is not particularly limited, and examples thereof include styrene. Among them, it is preferable to use, as a raw material, polyisoprene (recycled isoprene), butadiene (recycled butadiene), and / or styrene (recycled styrene) derived from recycling.A production method of the recycled monomer is not particularly limited, and an example thereof includes a method in which the recycled monomer is synthesized from recycled-derived naphtha obtained by decomposing a rubber product such as a tire. Moreover, a production method for the naphtha derived from recycling is not particularly limited, and for example, a rubber product such as a tire may be decomposed under high temperature and pressure, may be decomposed with a microwave, or may be extracted after mechanical crushing.Further, the raw material (monomer) of the synthetic rubber such as IR, SBR, and BR may be a raw material derived from biomass. In the present specification, the biomass refers to a substance derived from a natural resource such as a plant. The biomass is not particularly limited, and examples thereof include agricultural, forest and fish products, sugars, wood chips, plant residues after detection of useful components, ethanol derived from plants, and biomass naphtha.The biomass-derived monomer (biomass monomer) is not particularly limited, and examples thereof include a biomass-derived butadiene and a biomass-derived aromatic vinyl compound. Examples of the butadiene include 1,2-butadiene and 1,3-butadiene. The aromatic vinyl is not particularly limited, and examples thereof include styrene. Moreover, a production method for the biomass monomer is not particularly limited, and examples thereof include those obtained by biological and / or chemical and / or physical conversion of animals and plants. Fermentation by microorganisms is typical of biological conversion, and chemical and / or physical conversion includes conversion by a catalyst, conversion by a high temperature, conversion by a high pressure, conversion by electromagnetic waves, conversion by a critical liquid, and a combination thereof.A polymer (biomass polymer) synthesized from the biomass monomer component is not particularly limited, and examples thereof include polybutadiene rubber synthesized from a biomass-derived butadiene and an aromatic vinyl butadiene copolymer synthesized from a biomass-derived butadiene and / or a biomass-derived aromatic vinyl. Examples of the aromatic vinyl / butadiene copolymer include a styrene-butadiene rubber synthesized from a biomass-derived butadiene and / or a biomass-derived styrene.Whether or not the raw material of the polymer is derived from biomass can be determined by PMC (Percent Modern Carbon) measured in accordance with D6866-10.The pMC is a ratio of a 14 C concentration of a sample to a 14 C concentration of the modern standard reference carbon (modern standard reference), and is a value used as an index for indicating the biomass content of the compound. The meaning of this value is described below.In one mole of carbon atoms (6.02×10 23 atoms), about 6.02×10 11 atoms of 14 C, which is about one billion position of the general carbon atoms, are present. 14 C is referred to as a radioisotope, has a half-life of 5,730 years, and the amount thereof regularly decreases. It takes 226,000 thousand years for complete disintegration thereof. Therefore, in the fossil fuels such as coal, petroleum and natural gas, which may have passed 226,000 thousands of years or more after carbon dioxide and the like are incorporated in the air into plants and the like and then fixed, all the 14 C elements initially contained therein are decomposed. Therefore, fossil fuels such as coal, petroleum and natural gas do not contain any 14 C elements at all in the present 21st century. Therefore, the chemical substances produced from these fossil fuels as raw materials also do not contain any 14 C elements at all.On the other hand, 14 C is continuously generated by the nuclear reaction of the commiscous rays in the air, the generation of 14 C is balanced with a decrease due to the radioactive decay, and thus the amount of 14 C is a constant amount in the atmospheric environment of the earth. As a result, the 14 C concentration of the substance derived from the biomass resources which are in substance circulation in the current environment is a value of about 1×10 -12 mol %, or the like, with respect to the total S atoms as described above. As a result, the biomass fraction in a particular connection can be calculated by using the difference between these values.This 14 C is generally measured as follows. The accelerator mass spectrometry method using a tandem accelerator is used to measure a 13 C concentration ( 13 C / 12 C}) and a 14 C concentration ( 14 C / 12 C). In the measurement, the 14 C concentration in the circulating carbon in the natural world in 1950 is used as the modern standard reference serving as the reference for the concentration of 14 C. As a specific standard substance, an oxalic acid standard substance provided by the National Institute of Standards and Technology (NIST) is used. The specific radioactivity of carbon in oxalic acid (the radioactivity intensity of 14 C per 1 g of carbon) is separated for each carbon isotope, corrected to a constant value for 13 C, and subjected to attenuation correction from 1950 to the measurement date, thereby obtaining a value to be used as the value (100%) of the standard 14 C concentration. A ratio of this value to the value of the actually measured sample is the pMC value.As a result, in a case where the rubber is made 100% of a substance derived from biomass (natural basis), the rubber in the normal state often does not reach 100 at present although there is a regional difference or the like, and thus the rubber has a value of about 110 pMC. On the other hand, in a case where the 14C concentration of a chemical substance derived from a fossil fuel such as petroleum is measured, the chemical substance has a width of about 0 pMC (for example, 0.3 pMC). This value corresponds to 0% of the biomass fraction described above.From the above, it is suitable to use, in the rubber composition, a material such as rubber having a high pMC value, that is, a material such as rubber having a high biomass content from the viewpoint of environmental protection (sustainability).(b) Blend Material Other than Rubber Component(b-1) FillerThe rubber composition preferably contains silica or carbon black as a reinforcing agent. However, it may contain another filler, for example, calcium carbonate, talc, clay, clay, aluminum hydroxide, mica or the like, as required. Note that in a case where silica is used, the silica is preferably used in combination with a silane coupling agent.The mixing amount of the filler is preferably 60 parts by mass or more, more preferably 80 parts by mass or more, and even more preferably 110 parts by mass or more with respect to 100 parts by mass of the rubber component. On the other hand, from the viewpoint of dispersibility in the rubber composition, it is preferably 150 parts by mass or less, and more preferably 140 parts by mass or less.(i) SilicaSince silica has an OH group on the surface, in a case where a large amount of silica is contained, hydrogen bonding occurs between the silica surfaces and interacts with the rubber component. Therefore, during driving, it is easy to generate a force inside the rubber to transmit the force, and it is possible to easily transmit a force generated during turning, and thus excellent steering stability can be ensured. Moreover, the OH group on the surface can trap ozone, and thus the energy absorption performance can be improved, whereby the durability of the tire can be improved. Note that the content of silica with respect to 100 parts by mass of the rubber component is more preferably 50 parts by mass or more, still more preferably 70 parts by mass or more, and even more preferably 90 parts by mass or more. The upper limit is preferably 150 parts by mass or less, and more preferably 130 parts by mass or less.A BET specific surface area of the silica is preferably more than 100 m 2 / g, and more preferably more than 130 m 2 / g from the viewpoint of obtaining favorable durability performance. on the other hand, it is preferably less than 250 m 2 / g, and more preferably less than 200 m 2 / g. Note that the above-described BET specific surface area is a value of N 2 SA measured by the BET method according to ASTM D3037-93.The silica is not particularly limited, and it is possible to use those usually used in the tire industry, for example, a silica (anhydrous silica) produced by a dry type method and a silica (hydrous silica) produced by a wet type method. As a commercially available product thereof, it is possible to use a product manufactured by Evonik Industries AG, Rhodia, Tosoh Silica Corporation, Nippon Solvay K.K., Tokuyama Corporation, or the like.The raw material of silica is not particularly limited. For example, it may be a mineral-derived raw material such as quartz, or may be a biologically-derived raw material such as rice hulls (for example, silica obtained by using a biomass material such as rice hulls as a raw material), and recycled silica from a product containing silica may be used. Among the above, the hydrous silica produced by a wet type method is preferred for the reason that the number of silanol groups is large. However, persistent silica (silica obtained from a biomass material as a raw material or silica recycled from a product containing silica) is preferable.Silica obtained by using a biomass material as a raw material can be obtained, for example, by extracting a silicate from rice hull ash obtained by burning rice hulls by using a sodium hydroxide solution and then by filtering, washing, drying, and crushing a precipitate of silica produced by reacting the silicate with sulfuric acid in the same manner as in the case of the wet type silica in the related art.For the silica recycled from a product containing silica, silica recovered from a product containing silica, for example, an electronic component such as a semiconductor, or a filter material such as a tire, a desiccant, or diatomaceous earth, may be used. Moreover, a method for performing recovery is not particularly limited, and examples thereof include thermal decomposition, electromagnetic wave decomposition, and the like. Among the above, silica recovered from an electronic component such as a semiconductor or from a tire is preferred.In a case where silica is crystallized, it is not dissolved in water, and the component of silica, that is, silica, cannot be used. By managing the combustion temperature and the combustion time, it is possible to suppress the crystallization of silica in the rice hull ash (see Japanese Unexamined Patent Publication No. 2009-2594, Akita Prefectural University Web Journal B / 2019, vol. 6, pp. 216-222, and the like).For the amorphous silica extracted from rice hulls, amorphous silica commercially available from Wilmar International Limited and the like can be used.Note that this silica may be used alone or two or more kinds thereof may be used in combination. Moreover, from the viewpoint of environmental protection (sustainability), it is suitable to use biomass silica or recycled silica.(ii) Silane coupling agentIn a case where silica is used, it is preferable to use a silane coupling agent in combination in order to improve dispersibility of the silica and improve mechanical properties, moldability, and the like by reacting it with the silica.The silane coupling agent is not particularly limited, and examples thereof include sulfide-based silane coupling agents such as 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-dimethylthiocarbamoyltetrasulfide, 2-Triethoxysilylethyl-N,N-dimethylthiocarbamoyl tetrasulfide and 3-triethoxysilylpropyl methacrylate monosulfide; mercapto-based silane coupling agents such as 3-mercaptopropyltrimethoxysilane, 2-mercaptoethyltriethoxysilane and NXT and NXT-Z manufactured by Momentive Performance Materials Inc.; vinyl-based silane coupling agents such as vinyltriethoxysilane and vinyltrimethoxysilane; amino-based silane coupling agents such as 3-aminopropyltriethoxysilane and 3-aminopropyltrimethoxysilane; glycidoxy-based silane coupling agents such as γ-glycidoxypropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane; nitro-based silane coupling agents such as 3-nitropropyltrimethoxysilane and 3-nitropropyltriethoxysilane; and chlorine-based silane coupling agents such as 3-chloropropyltrimethoxysilane and 3-chloropropyltriethoxysilane. Among these, a silane coupling agent having a thiocarbonyl group such as the above-described NXT is preferred. These may be used alone, or two or more kinds thereof may be used in combination.As the silane coupling agent, it is possible to use a product manufactured by, for example, Evonik Industries AG, Momentive Performance Materials Inc., Shin-Etsu Chemical Co., Ltd., Tokyo Chemical Industry Co., Ltd., AZmax Co., Ltd., or DuPont Toray Specialty Materials K.K.The content of the silane coupling agent is preferably more than 2 parts by mass, more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more with respect to 100 parts by mass of silica. The upper limit is preferably 15 parts by mass or less, more preferably 12 parts by mass or less, and even more preferably 9 parts by mass or less.(iii) Carbon BlackIt is preferable that the carbon black is used for the intended purpose of improving crack growth resistance, durability, resistance to ultraviolet deterioration, and the like of the tire.From the viewpoint of the reinforcing property of the rubber, the nitrogen adsorption specific surface area (N 2 SA) of the carbon black is preferably 30 m 2 / g or more, more preferably 50 m 2 / g or more, and even more preferably 60 m 2 / g or more. On the other hand, from the viewpoint of exothermicity, it is preferably 250 m 2 / g or less, more preferably 150 m 2 / g or less, and even more preferably 120 m 2 / g or less. Note that the nitrogen adsorption specific surface area of the carbon black is measured according to ASTM D4820-93.From the viewpoint of rubber rigidity, the amount of dibutyl phthalate (DBP) absorbed by the carbon black is preferably 50 ml / 100 g or more, and more preferably 100 ml / 100 g or more. On the other hand, from the viewpoint of following ability to deform the rubber, it is preferably 250 ml / 100 g or less, and more preferably 150 ml / 100 g or less. Note that the amount of DBP absorbed by the carbon black is measured in accordance with ASTM D2414-93.The carbon black is not particularly limited, and examples thereof include furnace black (furnace black) such as SAF, ISAF, HAF, MAF, FEF, SRF, GPF, APF, FF, CF, SCF, and ECF; acetylene black (acetylene black); thermal carbon black (thermal carbon black) such as FT and MT; and channel black (channel black) such as EPC, MPC, and CC. Moreover, examples of the product number thereof include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550 and N762. One kind thereof may be used alone, or two or more kinds thereof may be used in combination.The raw material of the carbon black may be, in addition to the mineral oil, a biomass material such as lignin and vegetable oil, or may be a thermally decomposed oil obtained by subjecting a rubber product containing carbon black such as used tires to thermal decomposition (regenerated carbon black). As the carbon black, it is preferable to use persistent carbon black (carbon black whose raw material is a biomass material, or regenerated carbon black).Moreover, a production method for the carbon black may be a combustion production method such as a furnace method, may be a production method by a hydrothermal carbonization (HTC) method, or may be a production method by thermal decomposition of methane by a thermal carbon black method, or the like.As a commercially available product thereof, it is possible to use a product manufactured by ASAHI CARBON CO., LTD., Cabot Japan K.K., TOKAI CARBON CO., LTD., Mitsubishi Chemical Corporation, Lion Specialty Chemicals Co., Ltd., NIPPON STEEL Chemical & Material Co., Ltd., or Columbia Carbon. These may be used alone, or two or more kinds thereof may be used in combination.The content of carbon black with respect to 100 parts by mass of the rubber component is preferably 5 parts by mass or more, and more preferably 10 parts by mass or more. The upper limit is preferably 30 parts by mass or less, and more preferably 25 parts by mass or less.(iv) Rubber powderVulcanized rubber particles are particles including vulcanized rubber as a material, and particularly a rubber powder or the like specified in JIS K 6316:2017 can be used. From the viewpoint of environmental and cost consideration, a regenerated rubber powder made from a powder product of a used tire or the like is preferable. One kind thereof may be used alone, or two or more kinds thereof may be used in combination.(v) Other FillersIn addition to the carbon black and silica described above, the rubber composition may further contain a filler conventionally used in the tire industry, for example, graphite, calcium carbonate, talc, clay, clay, aluminum hydroxide, mica or magnesium sulfate. In a case where these are contained, the contents thereof are, for example, more than 0.1 parts by mass and less than 150 parts by mass with respect to 100 parts by mass of the rubber component.(b-2) Softener ComponentIt is preferable to use a softening agent component in the rubber composition as needed from the viewpoint of imparting plasticity to the rubber component and suitably dispersing the powder material during kneading. It should be noted that the concept of the softener component herein includes both a liquid softener at 25° C. and a solid softener at 25° C.Examples of the softening agent include a resin component, an oil, a liquid polymer, and an ester-based plasticizer. The softening agent may be a softening agent derived from a mineral resource such as petroleum or natural gas, may be a softening agent derived from biomass, or may be a softening agent derived from naphtha recycled from rubber products or non-rubber products. Moreover, a hydrocarbon component having a low molecular weight obtained by the thermal decomposition and extraction of a used tire or a used product containing various components can be used as a softening agent, and among them, as a lasting softening agent, a softening agent derived from biomass or derived from recycling is preferred.Note that these softeners may be used alone, or two or more kinds thereof may be used in combination. The content of the plasticizer component with respect to 100 parts by mass of the rubber component is preferably 3 parts by mass or more, more preferably 5 parts by mass or more, and even more preferably 7 parts by mass or more. The upper limit is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and even more preferably 15 parts by mass or less. Note that the content of the plasticizer component also includes the amount of the oil contained in rubber (oil-extended rubber) or the like.(i) OilExamples of the oil include a mineral oil, a vegetable oil, and an animal oil. Moreover, from the viewpoint of ecobalance, a waste oil used in a rubber mixer or an engine or an oil obtained by refining a waste feed oil used in a restaurant may be used.(i-1) Mineral OilIn the present specification, the mineral oil refers to an oil derived from a mineral resource such as petroleum or natural gas. Examples of the mineral oil include a paraffin-based oil (mineral oil), a naphthene-based oil, and an aromatic oil.Examples of the specific mineral oil include mild extract solvate (MES), distilled aromatic extract (DAE), treated distilled aromatic extract (TDAE), treated residual aromatic extract (TBE), and residual aromatic extract (RAE).Moreover, an oil having a low content of a polycyclic aromatic compound (PCA) may also be used for environmental measures. Examples of the low PCA oil include MES, TDAE, and a naphthene-based heavy oil.Examples of the commercially available mineral oil include paraffin-based, flavor-based and naphthene-based oils. It is possible to use a product manufactured by, for example, Idemitsu Kosan Co., Ltd., SANKYO YUKA KOGYO K.K., ENEOS Corporation, Olisoy, H&R Group, HOKOKU CORPORATION, Showa Shell Sekiyu K.K., or Fuji Kosan Company, Ltd. These may be used alone, or two or more kinds thereof may be used in combination.(i-2) Vegetable OilExamples of the vegetable oil include linseed oil, rapeseed oil, thistle oil, soybean oil, corn oil, cottonseed oil, rice bran oil, tall oil, sesame oil, wild sesame oil, castor oil, tung oil, pine oil, pine tar oil, sunflower oil, coconut oil, palm oil, palm kernel oil, olive oil, camellia oil, jojoba oil, macadamia nut oil, peanut oil, grape seed oil, and Japanese wax.Further, examples of the vegetable oil also include refined oil (salad oil or the like) obtained by refining each of the above oils, ester-exchanged changed oil subjected to ester exchange, hydrogenated hardened oil, thermally polymerized oil subjected to thermal polymerization, oxidation-polymerized oil subjected to oxidation, and waste edible oil obtained by recovering the oil used as edible oil. It should be noted that the vegetable oil may be a liquid or a solid at normal temperature (25° C.). One kind thereof may be used alone, or two or more kinds thereof may be used in combination.The vegetable oil preferably contains acylglycerol and more preferably contains triacylglycerol. Note that the acylglycerol refers to a compound obtained by subjecting a hydroxy group of glycerol and a fatty acid to ester linkage. The acylglycerol is not particularly limited, and it may be 1-monoacylglycerol, may be 2-monoacylglycerol, may be 1,2-diacylglycerol, may be 1,3-diacylglycerol, or may be triacylglycerol. Further, the acylglycerol may be a monomer, may be a dimer, or may be a multimer that is a trimer or more. Note that an acylglycerol which is a dimer or more can be obtained by thermal polymerization, oxidative polymerization, or the like. Moreover, the acylglycerol may be a liquid or a solid at normal temperature (25° C.).A method of checking whether or not acylglycerol is contained in the rubber composition is not particularly limited; however, the check may be performed by 1 H-NMR measurement. For example, in a case where a rubber composition mixed with triacylglycerol is immersed in heavy chloroform at normal temperature (25° C.) for 24 hours, the rubber composition is removed, 1 H-NMR is subsequently measured at room temperature, and a signal of tetramethylsilane (TMS) is set to be 0.00 ppm, signals of about 5.26 ppm, about 4.28 ppm, and about 4.15 ppm are observed. It is presumed that these signals are signals derived from a hydrogen atom bonded to a carbon atom adjacent to the oxygen atom of the ester group, and thus the inclusion of the acylglycerol can be checked. Here, the term "about" refers to a range of ±0.10 ppm.Note that the fatty acid is not particularly limited, and may be an unsaturated fatty acid or a saturated fatty acid. Examples of the unsaturated fatty acid include a monovalent unsaturated fatty acid such as oleic acid and a polyvalent unsaturated fatty acid such as linoleic acid or linolenic acid. In addition, examples of the saturated fatty acid include butyric acid and lauric acid.Among them, it is desirable that the fatty acid contains a fatty acid having a small number of double bonds, that is, a saturated fatty acid or a monovalent unsaturated fatty acid, and oleic acid is preferable. As the vegetable oil containing such a fatty acid, for example, a vegetable oil containing a saturated fatty acid or a monovalent unsaturated fatty acid, or a vegetable oil subjected to modification such as ester exchange, may be used. Moreover, a plant for producing a vegetable oil containing such a fatty acid can be improved by breeding, genetic recombination, genome editing or the like.As the vegetable oil, it is possible to use those commercially available from, for example, Idemitsu Kosan Co., Ltd., SANKYO YUKA KOGYO K.K., ENEOS Corporation, Olisoy, H&R Group, HOKOKU CORPORATION, Fuji Kosan Company, Ltd., and Nisshin OilliO Group, Ltd.(ii) Liquid rubberThe liquid rubber is a polymer in a liquid state at normal temperature (25° C.), and is a rubber component that can be extracted from a vulcanized tire by extraction with acetone. Examples of the liquid rubber include a farnesene-based polymer, a diene-based liquid polymer, and a hydrogenated substance thereof.The farnesene-based polymer is a polymer obtained by polymerizing farnesene, and has a farnesene-based constitutional unit. With respect to farnesene, there are isomers such as α-farnesene ((3E,7E)-3,7,11-trimethyl-1,3,6,10-dodecatetraene) and β-farnesene (7,11-dimethyl-3-methylene-1,6,10-dodecatriene).The farnesene-based polymer may be a homopolymer of farnesene (a farnesene homopolymer) or a copolymer of farnesene and a vinyl monomer (a farnesene-vinyl monomer copolymer).Examples of the diene-based liquid 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).In the diene-based liquid polymer, the polystyrene is equivalent weight average molecular weight (Mw) measured by gel permeation chromatography (GPC), for example, more than 1.0×10 3 and less than 2.0×10 5. Here, Mw of the diene-based liquid polymer is a polystyrene equivalent value measured by gel permeation chromatography (GPC).As the liquid rubber, it is possible to use a product manufactured by, for example, Kuraray Co., Ltd. or Cray Valley.(iii) Resin componentThe resin component also functions as an adhesion promoting component and may be a solid or a liquid at normal temperature. Specific examples of the resin component include resins such as a rosin-based resin, a styrene-based resin, a coumarone-based resin, a terpene-based resin, a C5 resin, a C9 resin, a C5C9 resin, and an acrylic resin, and two or more kinds thereof may be used in combination. Note that the resin components may be provided with a modifying group capable of reacting with silica or the like, as required. The mixing amount of the resin component is preferably 1 to 10 parts by mass or less, and more preferably 2 to 6 parts by mass or less, with respect to 100 parts by mass of the rubber component.The rosin-based resin is a resin containing, as a main component, rosin acid obtained by processing pine resin. The rosin-based resin (rosin) may be classified according to the presence or absence of modification, and it may be classified into an unmodified rosin (unmodified rosin) and a rosin-modified product (rosin derivative). Examples of the unmodified rosin include tall rosin (also known as tall oil rosin), balsam rosin, wood rosin, disproportionated rosin, polymerized rosin, hydrogenated rosin, and other chemically modified rosin. The rosin modified product is a modified product of the unmodified rosin, examples of which include rosin esters, unsaturated carboxylic acid modified rosin, unsaturated carboxylic acid modified rosin esters, amide compounds of rosin, and amine salts of rosin.The styrene-based resin is a polymer using a styrene-based monomer as a constituent monomer, and examples thereof include a polymer obtained by performing polymerization using the styrene-based monomer as a main component (50% by mass or more). Specific examples thereof include a homopolymer obtained by subjecting each of styrene-based monomers (styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, α-methylstyrene, p-methoxystyrene, p-tert-butylstyrene, p-phenylstyrene, o-chlorostyrene, m-chlorostyrene, p-chlorostyrene, and the like) to homopolymerization, and a copolymer obtained by copolymerizing two or more styrene-based monomers, and a copolymer of a styrene-based monomer and another monomer capable of copolymerization with the styrene-based monomer.Examples of the other monomer include acrylonitriles such as acrylonitrile and methacrylonitrile; unsaturated carboxylic acids such as acrylic and methacrylic acid; unsaturated carboxylic acid esters such as methyl acrylate and methyl methacrylate; dienes such as chloroprene, butadiene and isoprene; olefins such as 1-butene and 1-pentene; and α,β-unsaturated carboxylic acids such as maleic anhydride or acid anhydrides thereof.Among coumarone-based resins, a coumarone-indene resin is preferred. The coumarone-indene resin is a resin containing coumarone and indene as monomer components constituting the skeleton (main chain) of the resin. Examples of the monomer component other than the coumarone and the indene contained in the skeleton include styrene, α-methylstyrene, methylindene and vinyltoluene.The hydroxyl group value (OH value) of the cumarone-indene resin is, for example, more than 15 mgKOH / g and less than 150 mgKOH / g. Note that the OH value is a value obtained by expressing the amount of potassium hydroxide required to neutralize the acetic acid bonded to the hydroxyl group with respect to milligrams in a case where 1 g of the resin is acetylated, and is a value measured according to a potentiometric method (JIS K 0070: 1992).The softening point of the cumarone-indene resin is, for example, higher than 30° C. and lower than 160° C. Note that the softening point is a temperature at which a ball falls in a case where the softening point specified in JIS K 6220- 1: 2001 is measured with a ring-and-ball type softening point measurement device.Examples of the terpene-based resin include polyterpene, terpene phenol, and an aromatic modified terpene resin. Polyterpene is a resin obtained by polymerizing a terpene compound and a hydrogenated substance thereof. The terpene compound is a hydrocarbon having a composition of (C 5 H 8)n and an oxygen-containing derivative thereof, and is a compound having, as a basic skeleton, a terpene classified into a monoterpene (C 10 H 16), a sesquiterpene (C 15 H 24) or a diterpene (C 20 H 32). Examples thereof include α-pinene, β-pinene, dipentene, limonene, myrcene, alloocimeene, osimeene, α-phellandrene, α-terpines, γ-terpines, terpineols, 1,8-cineol, 1,4-cineol, α-terpineol, β-terpineol, and γ-terpineol.Examples of the polyterpene also include terpene resins such as an α-pinene resin, a β-pinene resin, a limonene resin, a dipentene resin, and a β-pinene / limonene resin, for which the above-described terpene compounds are respectively used as raw materials, and hydrogenated terpene resins obtained by subjecting the terpene resins to hydrogenation treatment, respectively. Examples of the terpene phenol include a resin obtained by copolymerizing the above-described terpene compound and a phenol-based compound, and a resin obtained by subjecting the resin to hydrogenation treatment. Specific examples thereof include a resin obtained by condensing the terpene compound described above, a phenol-based compound, and formalin. Note that examples of the phenol-based compound include phenol, bisphenol A, cresol, and xylenol. Examples of the aromatic modified terpene resin include a resin obtained by modifying a terpene resin with an aromatic compound and a resin obtained by subjecting the resin to hydrogenation treatment. Note that the aromatic compound is not particularly limited as long as it is a compound having an aromatic ring. Examples thereof, however, include a phenol compound such as phenol, an alkylphenol, an alkoxyphenol, or a phenol containing unsaturated hydrocarbon group; a naphthol compound such as naphthol, an alkylnaphthol, an alkoxynaphthol, or a naphthol containing unsaturated hydrocarbon group; a styrene derivative such as styrene, an alkylstyrene, an alkoxystyrene, and a styrene containing unsaturated hydrocarbon group; and cumarone and indene.The term "C5 resin" refers to a resin obtained by polymerizing a C5 fraction. Examples of the C5fraction include petroleum fractions equivalent to those having 4 to 5 carbon atoms, such as cyclopentadiene, pentene, pentadiene and isoprene. As the C5-based petroleum resin, a dicyclopentadiene (DCPD) resin is suitably used.The term "C9 resin" refers to a resin obtained by polymerizing a C9 fraction, and may be a resin obtained by hydrogenating or modifying the obtained resin. Examples of the C9fraction include petroleum fractions equivalent to those having 8 to 10 carbon atoms, such as vinyltoluene, alkylstyrene, indene and methylindene. As a specific example thereof, a coumarone-indene resin, a coumarone resin, an indene resin, and an aromatic vinyl-based resin are suitably used. The aromatic vinyl-based resin is preferably a homopolymer of α-methylstyrene (AMS resin) or styrene or a copolymer of α-methylstyrene and styrene, and more preferably a copolymer of α-methylstyrene and styrene, because of the reason that it is economical, easy to process, and excellent in exothermicity. As the aromatic vinyl-based resin, it is possible to use those commercially available from, for example, Kraton Corporation and Eastman Chemical Company.The term "C5C9 resin" refers to a resin obtained by copolymerizing the C5 fraction and the C9 fraction, and may be a resin obtained by hydrogenating or modifying the obtained resin. Examples of the C5fraction and the C9fraction include the petroleum fraction described above. As the C5C9 resin, it is possible to use those commercially available from, for example, Tosoh Corporation and Shandong Luhua Group Co., Ltd.The acrylic resin is not particularly limited, but for example, a solvent-free acrylic resin may be used.Examples of the solvent-free acrylic resin include a (meth)acrylic resin (polymer) obtained according to a continuous high-temperature polymerization method (continuous high-temperature bulk polymerization method) (the method described in U.S. Pat. No. 4414370, Japanese Unexamined Patent Publication No. S59-6207, Japanese Examined Patent Publication No. H 5-5805, Japanese Unexamined Patent Publication No. H 1-313522, U.S. Patent No. 5010166, TOAGOSEI Annual Research Report, TREND 2000 No. 3, pp. 42-45 or the like) without using, as far as possible, a polymerization initiator, a chain transfer agent, an organic solvent and the like, which are auxiliary raw materials. Note that (meth)acrylic means methacrylic and acrylic.Examples of the monomer component constituting the acrylic resin include (meth)acrylic acid, a (meth)acrylic acid ester (alkyl ester, aryl ester, aralkyl ester or the like), (meth)acrylamide, and a (meth)acrylic acid derivative such as a (meth)acrylamide derivative.Moreover, as the monomer component constituting the acrylic resin, an aromatic vinyl such as styrene, α-methylstyrene, vinyltoluene, vinylnaphthalene, divinylbenzene, trivinylbenzene or divinylnaphthalene may be used together with (meth)acrylic acid or a (meth)acrylic acid derivative.The acrylic resin may be a resin composed of only a (meth)acrylic component, or may be a resin also having a component other than the (meth)acrylic component as a component thereof. Moreover, the acrylic resin may have a hydroxyl group, a carboxyl group, a silanol group, or the like.As the resin component, it is possible to use a product manufactured by, for example, Maruzen Petrochemical CO., LTD., Sumitomo Bakelite Co., Ltd., Yasuhara Chemical Co., Ltd., Tosoh Corporation, Rutgers Chemicals AG, BASF SE, Kraton Corporation, NITTO CHEMICAL CO., LTD., Nippon Shokubai Co., Ltd., ENEOS Corporation, Arakawa Chemical Industries, Ltd., or Taoka Chemical Co., Ltd.(b-3) WaxThe rubber composition may contain wax. The content of wax is preferably 0.5 to 20 parts by mass, more preferably 1.0 to 15 parts by mass, and even more preferably 1.5 to 10 parts by mass with respect to 100 parts by mass of the rubber component.The wax is not particularly limited, and any wax usually used in the tire industry may be suitably used. Examples thereof include a mineral-based wax and a plant-based wax. The mineral-based wax refers to a wax derived from a mineral resource such as oil or natural gas. Among them, a wax derived from plants is preferred.Examples of the vegetable-derived wax include rice wax, carnauba wax and candelilla wax. Examples of the mineral-based wax include a paraffin wax, a microcrystalline wax, and a special wax selected thoroughly, and a paraffin wax is preferred. Note that the stearic acid is not contained in the wax.Note that, as the wax, a wax commercially available from, for example, OUCHI SHINKO CHEMICAL INDUSTRIAL CO., LTD., NIPPON SEIRO Co., Ltd., or Paramelt B.V. may be used. These waxes may be used alone, or two or more of them may be used in combination.(b-4) AntioxidantEach rubber composition may contain an antioxidant. The content of the antioxidant is, for example, more than 1 part by mass and less than 10 parts by mass with respect to 100 parts by mass of the rubber component.The antioxidant is not particularly limited. However, examples thereof include a naphthylamine-based antioxidant such as phenyl-α-naphthylamine; a diphenylamine-based antioxidant such as octylated diphenylamine or 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine; a p-phenylenediamine-based antioxidant such as N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PP), N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine (77PD), N,N'-diphenyl-p-phenylenediamine (DPPD), N,N'-ditolyl-p-phenylenediamine (DTPD), N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD) or N,N'-di-2-naphthyl-p-phenylenediamine (DNPD); a quinoline-based antioxidant such as a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline; a monophenol-based antioxidant such as 2,6-di-t-butyl-4-methylphenol or styrenated phenol; a bis-, tris- or polyphenol-based antioxidant such as tetrakis[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane. Among the above, a p-phenylenediamine-based antioxidant or a quinoline-based antioxidant is preferred, and a polymer of N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine and 2,2,4-trimethyl-1,2-dihydroquinoline is more preferred. These may be used alone, or two or more kinds thereof may be used in combination.As a commercially available product thereof, it is possible to use a product manufactured by, for example, Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., OUCHI SHINKO CHEMICAL INDUSTRIAL CO., LTD., or FLEXSYS.(b-5) Processing aidThe rubber composition may contain a processing aid. Examples of the processing aid include a metal salt (a compound in which a hydrogen atom of an acid is replaced with a metal ion), a fatty acid amide, an amide ester, and a fatty acid ester. These may be used alone, or two or more kinds thereof may be used in combination. Among the above, a metal salt or a fatty acid amide is preferable, and a metal salt is more preferable.Examples of the metal used for the metal salt include an alkali metal such as potassium or sodium and an alkaline earth metal such as calcium and barium. In addition, magnesium, zinc, nickel, molybdenum, or the like may also be used. Among the above, an alkali metal is preferred.Examples of the acid used for the metal salt include fatty acids such as lauric acid, myristic acid and palmitic acid. Moreover, boric acid, carbonic acid, hydrochloric acid, nitric acid, sulfuric acid or the like may also be used.As a commercially available product of the processing aid, a product of KISHIDA CHEMICAL CO., LTD., Kenei Pharmaceutical Co., Ltd., Structol Company of America, LLC, Performance Additives, or the like can be used.The content of the processing aid is preferably 0.5 part by mass or more, and more preferably 1 part by mass or more with respect to 100 parts by mass of the rubber component. The upper limit thereof is preferably 6 parts by mass or less, and more preferably 4 parts by mass or less.(b-6) Lubricant (stearic acid)The rubber composition may contain a lubricant. As the lubricant, it is possible to preferably use a lubricant based on a fatty acid derivative such as stearic acid. As the stearic acid, it is possible to use those publicly known in the art. Specifically, it is possible to use a product manufactured by, for example, NOF Corporation, NOF Corporation, Kao Corporation, FUJIFILM Wako Pure Chemical Corporation, or Chiba Fatty Acid Co., Ltd. Moreover, it is possible to use STRUCTOL WB16 manufactured by Structol Company of America, LLC.The content of stearic acid is preferably more than 0.5 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.(b-7) Zinc oxideThe rubber composition may contain zinc oxide. The content of zinc oxide is, for example, more than 0.5 parts by mass and less than 10 parts by mass with respect to 100 parts by mass of the rubber component. As the zinc oxide, it is possible to use those publicly known in the art, and it is possible to use a product manufactured by, for example, Mitsui Mining & Melting Co., Ltd., Toho Zinc Co., Ltd., Hakusui Tech Co., Ltd., Shodo Chemical Industry Co., Ltd., or Sakai Chemical Industry Co., Ltd.(b-8) Crosslinking agent and vulcanization acceleratorThe rubber composition preferably contains a crosslinking agent such as sulfur. The content of the crosslinking agent is, for example, more than 0.1 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component. Note that the sulfur content is a pure sulfur content and is a content excluding an oil component in a case where insoluble sulfur is used.Examples of the sulfur include pulverized sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur and soluble sulfur which are usually used in the rubber industry. These may be used alone, or two or more kinds thereof may be used in combination.Note that, as the sulfur, it is possible to use a product manufactured by, for example, Tsurumi Chemical Industry Co., Ltd., Karuizawa Sulfur Co., Ltd., SHIKOKU CHEMICALS CORPORATION, FLEXSYS, Nippon Inui Kogyo Co., Ltd., or NIPPON KANRYU INDUSTRY CO., LTD.A cross-linking agent other than sulfur may be used. Specifically, it is possible to use, for example, a vulcanizing agent containing sulfur atoms such as TACKIROL V200 manufactured by Taoka Chemical Co., Ltd., DURALINK HTS (1,6-hexamethylene-sodium dithiosulfate dihydrate) manufactured by FLEXSYS, or KA9188 (1,6-bis(N,N'-dibenzylthiocarbamoyldithio)hexane: hybrid crosslinking agent) manufactured by Lanxess AG, or an organic peroxide such as dicumyl peroxide.Moreover, it is preferable that the rubber composition contains a vulcanization accelerator. The content of the vulcanization accelerator is, for example, more than 0.3 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.Examples of the vulcanization accelerator include thiazole-based vulcanization accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide and N-cyclohexyl-2-benzothiazylsulfenamide; 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-benzothiazolesulfenamide, N-t-butyl-2-benzothiazolylsulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, N-oxyethylene-2-benzothiazolesulfenamide and N,N'-diisopropyl-2-benzothiazolesulfenamide; and guanidine-based vulcanization accelerators such as diphenylguanidine, diortho-tolylguanidine and ortho-tolylbiguanidine. These may be used alone, or two or more kinds thereof may be used in combination.(b-9) OthersIn addition to each of the components described above, the rubber composition may be blended with additives commonly used in the tire industry, for example, an organic filler such as a cellulose fiber and an organic peroxide, as required. The contents of these additives are, for example, more than 0.1 parts by mass and less than 50 parts by mass with respect to 100 parts by mass of the rubber component.Note that, among the respective materials described above, various materials (for example, a rubber, oil, a resin, a vulcanization accelerator, an antioxidant, and a surfactant) containing a carbon atom may be derived from carbon dioxide in the air. With respect to a method for obtaining a mixture according to the present invention from carbon dioxide, carbon dioxide may be subjected to direct conversion, or methane obtained by a methanizing process of synthesizing methane from carbon dioxide may be converted.After the band cord is treated with an adhesive, the band cord can be used as a band by being bonded with a predetermined rubber composition for a band.(2) Production of Rubber CompositionThe rubber composition can be produced by a general method, for example, a production method including a base kneading process of kneading a rubber component and a filler such as silica, and a final kneading step of kneading a kneaded product obtained in the base kneading process and a crosslinking agent.The kneading can be carried out using a publicly known kneader (the sealed type), for example, a Banbury mixer, a kneader or an open roll.In the basic kneading process, a kneading temperature is, for example, higher than 50° C. and lower than 200° C., and a kneading time is, for example, more than 30 seconds and less than 30 minutes. In the base kneading process, a mixing agent used in the rubber industry in the related art, for example, a softening agent such as oil, stearic acid, zinc oxide, an antioxidant, a wax, or a vulcanization accelerator may be appropriately added and kneaded as needed in addition to the above-described components.In the final kneading process, the kneaded product obtained in the basic kneading process and a crosslinking agent are kneaded. In the final kneading process, a kneading temperature is, for example, higher than room temperature and lower than 80° C., and a kneading time is, for example, more than 1 minute and less than 15 minutes. In the final kneading process, in addition to the above-described components, a vulcanization accelerator, zinc oxide, or the like may be appropriately added and kneaded as needed.3. Production of TiresThe tire according to the present embodiment can be manufactured by a typical method. First, the rubber composition obtained as described above is used to form a tread such that rubber hardness (Shore hardness) Hs as described above is more than 70 pt. With respect to a method for adjusting the rubber hardness (Shore hardness) Hs of the tread, for example, the rubber hardness (Shore hardness) Hs of the tread can be increased by increasing a blending amount of a filler such as silica or carbon in the rubber composition, increasing a blending amount of a crosslinking agent, or by decreasing a blending amount of a plasticizer (oil or resin). The tread may be formed by extrusion processing, for example. Next, they are subsequently combined together with other rubber members on a tire molding machine, thereby producing an unvulcanized tire.Specifically, an inner liner as a member for securing the airtightness holding property of the tire, a carcass as a member that resists the load, impact, and inflation air pressure applied to the tire, and a belt member, a band, or the like as a member that firmly clamps the carcass and increases the rigidity of the tread are wound on a forming drum, and a bead portion as a member for fixing the tire to the rim while fixing both ends of the carcass at edge portions on both sides is arranged to be formed into a toroidal shape. Then, the tread is bonded to a center part of an outer periphery, and the sidewall is bonded to an outer side in the radial direction to form a side part, thereby producing an unvulcanized tire. As described above, the tire according to the present embodiment is configured such that the carcass is formed to have a monolayer structure by using a carcass cord having a total thickness of more than 2,400 dtex. Moreover, a cord in which filaments having a circular cross section are simply twisted (1×4 structure) without being corrugated is used as the band cord constituting the band.Thereafter, the unvulcanized tire produced as described above is subjected to heating and pressurization in a vulcanizing machine to obtain a tire. The vulcanization process can be performed by using a publicly known vulcanizing agent. A vulcanization temperature is, for example, higher than 120° C. and lower than 200° C., and a vulcanization time is, for example, more than 5 minutes and less than 15 minutes.In the tire obtained as described above, by appropriately controlling a sum of a diameter Bar (mm) of the band cord, a diameter Ber (mm) of the belt cord, a diameter Car (mm) of the carcass cord, and a thickness Trg (mm) of the tread, as described above, it is possible to improve the overall performance of low fuel consumption properties and high-speed durability properties by the cooperation of the effect due to the use of the PET band and the effect due to the appropriately formed tread and carcass.Moreover, the tire according to the present invention can be suitably used as a tire for a passenger car, a tire for a large passenger car, a tire for a large SUV, a tire for a truck / bus, a tire for a motorcycle, a racing tire, a studless tire (a tire for winter), a whole year tire, a run flat tire, or the like. In particular, it is preferably used as a tire for a passenger car.[Examples]Examples (examples) that are considered preferable in carrying out the present embodiment are shown below; however, the scope of the present invention is not limited to these examples.A tire (tire size: 195 / 65R15) composed of a tread formed of various blend materials shown below and tire members such as a belt and a belt is examined, and the results of low fuel consumption and high speed durability properties calculated based on the evaluation method described later are shown together in the lower part of Table 1.1. Production of Rubber CompositionA rubber composition for a tread is produced using various blending materials shown below.(1) Mixed Material(a) Rubber component(a-1) NR: TSR20(a-2) SBR: HPR840 manufactured by ENEOS Materials Corporation(Styrene content: 10 mass %, vinyl content: 42 mol %, Tg: -60° C., oil-unstretched product)(a-3) BR: UBEPOL BR (registered trademark) 150B manufactured by UBE Corporation(b) Blend Material Other than Rubber Component(b-1) Carbon black: DIABLACK N220 manufactured by Mitsubishi Chemical Corporation(N 2 SA: 115m 2 / g)(b-2) Silica: ULTRASIL VN3 manufactured by Evonik Industries AG(N 2 SA: 175 m 2 / g, average primary particle diameter: 17 nm)(b-3) Coupling agent: NXT manufactured by Momentive Performance Materials Inc.(3-octanoylthiopropyltriethoxysilane)(b-4) Oil: Mineral oil A / OMIX manufactured by SANKYO YUKA KOGYO K.K.(b-5) Resin: YS resin PX850 manufactured by YASUHARA CHEMICAL CO., LTD.(Softening point: 85° C., β-pinene resin (terpene-based resin))(b-6) Wax: OZOCE 0355 manufactured by NIPPON SEIRO CO., LTD.(b-7) Antioxidant-1: NOCRAC 6C manufactured by OUCHI SHINKO CHEMICAL INDUSTRIAL CO., LTD.(N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine)(b-8) Antioxidant-2: ANTACHE RD manufactured by Kawaguchi Chemical Industry Co., Ltd.(Poly(2,2,4-trimethyl-1,2-dihydroquinoline))(b-9) Stearic acid: Beaded stearic acid "Tsubaki" manufactured by NOF Corporation(b-10) Zinc oxide: Two kinds of zinc oxide manufactured by Mitsui Mining & Melting Co., Ltd.(b-11) Sulfur: Pulverized sulfur manufactured by Karuizawa Sulfur Co., Ltd.(b-12) Vulcanization Accelerator-1: NOCCELER CZ manufactured by OUCHI SHINKO CHEMICAL INDUSTRIAL CO., LTD.(N-Cyclohexylbenzothiazole-2-sulfenamide)(b-13) Vulcanization Accelerator-2: NOCCELER D manufactured by OUCHI SHINKO CHEMICAL INDUSTRIAL CO., LTD.(N,N'-diphenylguanidine)(2) Production of rubber composition for treadBased on each of the mixtures A to C shown in Table 1, a kneaded product is obtained by kneading materials other than sulfur and a vulcanization accelerator for 5 minutes under a condition of 150° C. using a 1.7 L-Banbury mixer manufactured by Kobe Steel, Ltd.Next, sulfur and a vulcanization accelerator are added to the kneaded product, and kneading is performed for 5 minutes under a condition of 80° C. using an open roll to obtain rubber compositions for a tread according to Mixtures A to C.2. Shapes of Tire Members (Tread, Band and Belt)(1) Tread FormingNext, the tread at each thickness shown in Table 2 is molded using the rubber composition obtained above.(2) Tape FormingIn parallel, each band cord shown in Table 2 is covered with a predetermined rubber composition for a band to form each band.(3) Belt FormingIn the same manner, each belt cord shown in Table 2 is covered with a predetermined rubber composition for a belt to form each belt.3. Production of TiresNext, each of the treads, each of the belts and each of the belts obtained as above is bonded to other tire members, respectively, to form an unvulcanized tire, and the unvulcanized tire is subjected to press vulcanization for 10 minutes under a condition of 170° C. to produce a test tire of Example 1 to Example 4 and Comparative Example 1 to Comparative Example 6, respectively.4. Performance Evaluation Test(1) Evaluation of high-speed durabilityEach test tire is installed in a rim (size=15×6 J), the tire is inflated with air, the internal pressure is adjusted to 280 kPa, the tire is mounted on a drum running test machine, a vertical load of 4.22 kN is applied, and the speed is gradually increased from 200 km / h by 10 km / h to measure a time and a speed until the tire is damaged. The obtained time is divided by a time required to increase a speed to the next speed to determine a value obtained by adding a value obtained by multiplying 10 km / h by the obtained speed, and the index in a case where the result in Comparative Example 1 is set to 100 is used as an index of high-speed durability.Next, the result in Comparative Example 1 is set to 100, and evaluation of high-speed durability is performed by performing indexing based on the following expression. A larger numerical value indicates excellent durability at high speed.(2) Evaluation of Low Fuel Consumption PropertiesUsing a rolling resistance testing machine, a rolling resistance coefficient (RRC) is measured in a case where each test tire is subjected to running on a drum at a speed of 80 km / h under the following conditions.Rim to be used: 15×6 JInternal pressure: 210 kPaLoad: 4.35 kNNext, the result in Comparative Example 1 is set to 100, and evaluation of low fuel consumption properties is performed by performing indexing based on the following expression. It indicates that the larger the numerical value, the better the low fuel consumption properties.Evaluation of Low Properties(3) Overall RatingThen, (1) and (2) are added together to be an overall score.The results of the evaluation are shown in Table 2. [Table 1] Table 1] [Table 1] Table 1]NR164050SBR645050BR20100Carbon black101020Silica6080110Coupling agent3, 64, 86,6Oil1686Resin2084Wax222Antioxidant-1222Antioxidant-20,50,50,5Processing Aid111Stearic acid stearic acid2,52,52,5Zinc oxide222Sulfur1,11,21,2Vulcanization Accelerator-11,71,71,7Vulcanization Accelerator-21,21,51,5Total amount (phr)222,4223,7259,5Hs (pt)556777 [Table 2][Table 2]1234561234(Tape cord)Cord MaterialN66PETPETPETPETPETPETPETPETPETCord diameter Bar (mm)0,660,540, 540, 540, 660,660, 540,40, 540, 66(Carcass)Cord MaterialPETPETPETPETPETPETPETPETPETPETNumber of layers (layers)1211111111Total thickness (dtex)33402200 220011004400220033402880288033404400Cord diameter Car (mm)0,681,10,800,780,550,680,550,550,680,78(Tread)MixtureA. AA. AA. AB. BB. BB. BC. CC. CC. CC. CNR content (phr)16161640404050505050Hs (pt)55555567676777777777Thickness Trg (mm)5,515,55,518586,51088(Belt cord)Cord diameter Ber (mm)0,650,650,630,800,590,800,590,590,650,80Number of filaments (filaments)4458482248(Calculated Parameter)Bar + Ber + Car + Trg (mm)8,1418,448,1020,927,3910,948,7712,1310,5211,04Tire Weight / Maximum Load Capacity0,0120,0150,0160,0190,0120,0180,0120,0110,0150,017(Evaluation)Evaluation of Low Properties10085102701089211511210298Evaluation of tire weight / maximum load capacity1001109211595105105112110110Overall Rating200195194185203197220224212208The present invention has been described above based on the embodiments. However, the present invention is not limited to the above-described embodiments. Various changes can be made to the above-described embodiments within the same and same ranges as those of the present invention.The present invention (1) is a tire comprising:a carcass including a carcass cord;a belt including a belt cord and provided on an outer side of the carcass in a tire radial direction;a band including a band cord and provided on an outer side of the belt in the tire radial direction; anda tread provided on an outer side of the belt in the tire radial direction,wherein the ribbon cord contains a polyethylene terephthalate fiber,the carcass is formed from a carcass cord having a total thickness of more than 2,400 dtex,the tread is formed of a rubber composition containing more than 20 parts by mass of an isoprene-based rubber in 100 parts by mass of a rubber component to have a rubber hardness (Shore hardness) Hs of more than 70 Pt, anda sum (Bar+Ber+Car+Trg) of a diameter Bar (mm) of the band cord, a diameter Ber (mm) of the belt cord, a diameter Car (mm) of the carcass cord, and a thickness Trg (mm) of the tread is less than 20.The present invention (2) is the tire according to the present invention (1) characterized in that the carcass is formed in a monolayer structure.The present invention (3) is the tire according to the present invention (1) or the present invention (2), characterized in that the belt cord is a cord composed of one or more and four or less filaments.The present invention (4) is the tire according to any combination of the present inventions (1) to (3), characterized in that the rubber hardness (Shore hardness) Hs is 71 pt or more.The present invention (5) is the tire according to the present invention (4) characterized in that the rubber hardness (Shore hardness) Hs is 73 pt or more.The present invention (6) is the tire according to the present invention (5), which is characterized in that the rubber hardness (Shore hardness) Hs is 75 pt or more.The present invention (7) is the tire according to any combination of the present inventions (1) to (6), characterized in that a ratio of a tire weight (kg) to a maximum load capacity (kg) of the tire (tire weight / maximum load capacity) is less than 0.02.The present invention (8) is the tire according to any combination of the present inventions (1) to (7), characterized in that the polyethylene terephthalate fiber is a polyethylene terephthalate lasting fiber.The present invention (9) is the tire according to any combination of the present inventions (1) to (8), characterized in that the rubber composition contains a vegetable oil.The present invention (10) is the tire according to any combination of the present inventions (1) to (9), characterized in that the rubber composition contains lasting carbon black.The present invention (11) is the tire according to any combination of the present inventions (1) to (10), characterized in that the rubber composition contains sustainable silica.List of reference characters1 Tire 2 Tread 3 Sidewall 4 Chafer 5 Bead 6 Inner liner 7 Carcass 8 Belt 9 Filler 10 Band CL Equatorial Plane of TireReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedJP 2022-38812 [0002, 0003] JPJP 2010-111753

[0062] JP 2009-2594

[0099] US 4414370

[0150] JP 59-6207

[0150] JP 5-5805

[0150] JP 1-313522

[0150] US 5010166

[0150] Cited Non-Patent LiteratureJIS L 1017:2002 [0010, 0019]JIS K 6253-3:2012

[0028] JIS K 6316:2017

[0114] JIS K 0070: 1992

[0142] JIS K 6220-1: 2001

[0143]

Claims

A tire comprising: a carcass including a carcass cord; a belt including a belt cord and provided on an outer side of the carcass in a tire radial direction; a band including a band cord and provided on an outer side of the belt in the tire radial direction; and a tread provided on an outer side of the belt in the tire radial direction, wherein the band cord includes a polyethylene terephthalate fiber, the carcass is formed of a carcass cord having a total thickness of more than 2,400 dtex, the tread is formed of a rubber composition including more than 20 parts by mass of an isoprene-based rubber in 100 parts by mass of a rubber component, having a rubber hardness (Shore hardness) Hs of more than 70 Pt, and a sum (Bar+Ber+Car+Trg) of a diameter Bar (mm) of the band cord, a diameter Ber (mm) of the belt cord, a diameter Car (mm) of the carcass cord, and a thickness Trg (mm) of the tread is less than 20.The tire of claim 1, wherein the carcass is formed in a monolayer structure.The tire according to claim 1 or 2, wherein the belt cord is a cord composed of one or more and four or less filaments.Tyre according to any one of Claims 1 to 3, in which the rubber hardness (Shore hardness) Hs is greater than 71 pt.Tyre according to Claim 4, in which the rubber hardness (Shore hardness) Hs is more than 73 pt.Tyre according to Claim 5, in which the rubber hardness (Shore hardness) Hs is more than 75 pt.The tire according to any one of claims 1 to 6, wherein a ratio of a weight (kg) to a maximum load capacity (kg) of the tire (tire weight / maximum load capacity) is less than 0.02.The tire of any one of claims 1 to 7, wherein the polyethylene terephthalate fiber is a durable polyethylene terephthalate fiber.The tire of any one of claims 1 to 8, wherein the rubber composition contains a vegetable oil.The tire of any one of claims 1 to 9, wherein the rubber composition contains lasting carbon black.The tire of any one of claims 1 to 10, wherein the rubber composition contains sustainable silica.

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