TIRES

Abstract

A tire comprising a tread section, wherein the tread section has at least one layer of rubber, where a ratio (G / W) L ) of a tire weight G in kg to a maximum load capacity W L in kg of the tire is 0.0140 or less, wherein a first layer, which forms a tread surface, is composed of a rubber composition comprising a rubber component, a plasticizer and a filler, wherein the plasticizer comprises at least one selected from the group consisting of a hydrogenated resin component and a vegetable oil, and where in a case where R represents a loft ratio on a ground contact area of ​​the tread section and P represents a total plasticizer content based on 100 parts by mass of the rubber component in the rubber composition, a product of R and P (R × P) is greater than 10.0.

Description

TECHNICAL AREA

[0001] The present invention relates to a tire. STATE OF THE ART

[0002] A tire tread had to exhibit not only fuel efficiency (rolling resistance) but also performance characteristics such as abrasion resistance, wet grip, and the like, and these performance characteristics were improved by a process of developing rubber components, fillers, and the like to be used in a tread section (e.g., JP 2008-31244 A and WO 2013 / 125614A1), but there is still room for improvement in terms of enhancing these performance characteristics with a good balance. SUMMARY OF THE INVENTION

[0003] In recent years, tires have been designed to be lighter in order to reduce rolling resistance. Reducing the thickness of a tread section is being considered to further reduce weight, but this raises concerns that the tire's lifespan would be shortened due to abrasion. Furthermore, because a more fuel-efficient rubber generates less heat, it is less likely to absorb shocks from the road surface, and the rubber's tensile strength tends to decrease.

[0004] One object of the present invention is to provide a tire that can improve overall performance in terms of fuel efficiency and abrasion resistance.

[0005] The present invention relates to a tire provided which comprises a tread section with at least one rubber layer, wherein a ratio (G / W) L) of a tire weight G in kg to a maximum load capacity W L in kg of the tire is 0.0140 or less, wherein a first layer forming a tread surface is composed of a rubber composition comprising a rubber component, a plasticizer and a filler, wherein the plasticizer comprises at least one selected from the group consisting of a hydrogenated resin component and a vegetable oil, and wherein, in a case where R represents a loft ratio on a ground contact area of ​​the tread section and P represents a total plasticizer content based on 100 parts by mass of the rubber component in the rubber composition, a product of R and P (R × P) is greater than 10.0.

[0006] According to the present invention, a tire is provided which can improve overall performance in terms of fuel efficiency and abrasion resistance. BRIEF DESCRIPTION OF THE FIGURES Fig. Figure 1 is a cross-sectional view showing a tire cross-sectional width Wt, a tire cross-sectional height Ht and a tire outer diameter Dt. EXECUTIONAL FORMS FOR IMPLEMENTING THE INVENTION

[0007] The tire, which is an embodiment of the present invention, is a tire comprising a tread section with at least one rubber layer, wherein a ratio (G / W) L ) of a tire weight G in kg to a maximum load capacity W Lin kg of the tire is 0.0140 or less, wherein a first layer forming a tread surface is composed of a rubber composition comprising a rubber component, a plasticizer and a filler, wherein the plasticizer comprises at least one selected from the group consisting of a hydrogenated resin component and a vegetable oil, and wherein, in a case where R represents a loft ratio on a ground contact area of ​​the tread section and P represents a total plasticizer content based on 100 parts by mass of the rubber component in the rubber composition, a product of R and P (R × P) is greater than 10.0.

[0008] Although it is not intended to be bound to any particular theory, one reason why the overall performance of fuel efficiency and abrasion resistance is improved in the tire of the present invention is assumed to be as follows.

[0009] As the tire cross-sectional width Wt increases, the maximum load capacity W decreases. L to, so that it is assumed that a by setting G / W L The fuel efficiency effect achieved increases to 0.0140 or less and by reducing tire weight.

[0010] By combining a hydrogenated resin or a vegetable oil, the viscosity of the rubber composition is slightly increased, thus increasing the shear force required to disperse a filler, and it is assumed that the dispersibility of the filler is improved.

[0011] Furthermore, increasing the loft ratio reduces the force exerted per unit area of ​​the rubber, thus suppressing rubber deformation. Conversely, increasing the plasticizer content enhances the compliance of a rubber surface and reduces slippage during driving, but it also increases the viscous components in the rubber, slightly impairing fuel efficiency. Therefore, it is assumed that adjusting the product of these plasticizers to a certain level or higher can suppress slippage at the rubber surface and rubber deformation.

[0012] Then, by combining these features, fuel efficiency, fracture strength and elongation at break can be synergistically improved, so that it is assumed that the overall performance of fuel efficiency and abrasion resistance of the tire can be improved.

[0013] The tanδ at 30 °C (30 °C tanδ) of the rubber composition is preferably 0.15 or less.

[0014] If 30 °C-tanδ is within the range described above, it is assumed that fuel efficiency can be improved.

[0015] The 30 °C taniS / R is preferably less than 0.60.

[0016] If 30 °C-tanδ / R is within the range described above, it is assumed that both fuel efficiency and improvement in abrasion resistance can be achieved by suppressing deformation of the rubber.

[0017] (R × P) / (G / W L ) is preferably greater than 1,000 and less than 2,000.

[0018] If (R × P) / (G / W L If the value is within the range described above, it is assumed that both a reduction in tire weight and an improvement in tire lifespan can be achieved.

[0019] From the perspective of the effects of the present invention, the total amount of styrene S in the rubber component is preferably 25 wt% or less.

[0020] S / R is preferably less than 45.

[0021] If S / R is within the range described above, it is assumed that a balance between deformation of the rubber and its ability to follow a road surface can be improved.

[0022] The rubber composition preferably comprises silicon dioxide with an average primary particle size of 16 nm or less, from the point of view of a balance between processability and fuel efficiency.

[0023] From the perspective of a balance between fuel efficiency and abrasion resistance, the rubber composition preferably includes a mercapto-based silane coupling agent.

[0024] If M 200in MPa represents a modulus at elongation of 200% of the rubber composition and 30 °CE* in MPa represents a complex elastic modulus at 30 °C of the rubber composition, fulfill M 200 , 30 °CE* and 30 °C-tanδ of the rubber composition prefers the relationship: M200×30 °C−E* / 30 °C-tanδ≥200.

[0025] If M 200 × 30 °CE* / 30 °C-tanδ is within the range described above, it is assumed that fuel efficiency and abrasion resistance can be improved with a good balance.

[0026] From the perspective of the effects of the present invention, the rubber component preferably comprises a hydrogenated styrene-butadiene rubber. <definitionen>

[0027] A "tread section" is a section that forms a ground contact area of ​​a tire, and in a case where the tire includes an element forming a tire skeleton of steel or textile material, such as a belt layer, a belt reinforcement layer, a carcass layer and the like, in a cross-section in a tire radial direction, an element on an outside of it in the tire radial direction.

[0028] A "standardized condition" is a state in which a tire is mounted on a standardized rim, filled with air at a standardized internal pressure, and no load is applied. Unless otherwise specified, a tire is used in this standardized condition.

[0029] Unless otherwise specified, a “dimension of each part of the tire” is a value specified in a standardized state for one appearing on the outer surface of the tire, while for one present inside the tire, or for one on a tire cut surface, it is a value specified in a state in which, for example, the tire is cut along a plane containing a tire axis of rotation and the cut piece of tire is held to a rim width of a standardized rim.

[0030] A "standardized rim" is a rim within a standard system that includes a standard on which the tire is based, and which is defined by the standard for each tire. For example, "standardized rim" refers to a standard rim of an applicable size described in the "JATMA YEAR BOOK" published by JATMA (The Japan Automobile Tire Manufacturers Association, Inc.), a "Measuring Rim" described in the "STANDARDS MANUAL" published by ETRTO (The European Tyre and Rim Technical Organisation), or a "Design Rim" described in the "YEAR BOOK" published by TRA (The Tire and Rim Association, Inc.), referenced in that order, and if an applicable size exists at the time of reference, the rim conforms to its standard.Furthermore, in the case of tires not defined by the standard, the standardized rim shall refer to a rim that can be fitted to the tire and whose width is the narrowest among rims that have the smallest diameter capable of maintaining internal pressure (i.e., causing no air leakage between the rim and the tire).

[0031] A “standardized internal pressure” is an air pressure in a standard system containing a standard on which the tire is based, defined by the standard for each tire. It refers, for example, to a “MAXIMUM AIR PRESSURE” in JATMA, “INFLATION PRESSURE” in ETRTO, or a maximum value described in the “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” table in TRA, to which reference is made in that order, as in the case of the standardized rim, and if there is an applicable size at the time of reference, the standardized internal pressure conforms to its standard.Furthermore, in the case of tires not defined by the standard, the standardized internal pressure shall refer to a standardized internal pressure (250 kPa or more) of another tire size (specified in the standard) for which the standardized rim is described as a standard rim, and if several standardized internal pressures of 250 kPa or more are described, it shall refer to a minimum value below that.

[0032] A "standardized load in kg" is a load within a standard system that includes a standard on which the tire is based. This standard is defined by the standard for each tire, for example, a "MAXIMUM LOAD CAPACITY" for JATMA, a "LOAD CAPACITY" for ETRTO, or a maximum value described in the "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" table for TRA. Reference is made to this standard in that order, as in cases of a standardized rim and standardized inflation pressure. If an applicable size exists at the time of reference, the load conforms to its standard. Then, in the case of a tire not specified in the standard described above, the separately calculated maximum load capacity W is used. L defined as a standardized load.

[0033] The "maximum load capacity W" L The following equations are used to calculate the volume. Where "V" is a virtual volume of the tire in mm³. 3 of a tire, "Dt" is the tire's outer diameter in mm in a standardized condition, "Ht" is the tire's cross-sectional height in mm in a tire radial direction in a cross-section of the tire in a plane containing a tire axis of rotation, and "Wt" is the tire's cross-sectional width in mm in a standardized condition. If R represents the rim diameter of the tire, Ht can be calculated as (Dt-R) / 2. Wt is a value obtained by excluding any patterns or markings on the tire's sidewall, if present. Additionally, "maximum load capacity" has the same meaning as the standardized load described above. WL=0.000011×V+175V={(Dt / 2)2−(Dt / 2−Ht)2}×π×Wt

[0034] A "tire weight G in kg" refers to the weight of a single tire, excluding the weight of the rim. Conversely, if a sound-dampening material, sealant, sensor, etc., is incorporated into a tire lumen, the weight G should include these components.

[0035] A “groove”, which includes the circumferential groove and the side groove, refers to a depression that has a width at least greater than 2.0 mm.

[0036] A "ground contact area" is a tread area obtained from a contour when a tire is pressed against the ground. It is obtained by mounting the tire on a standardized rim, applying a standardized internal pressure, and allowing the tire to stand at 25°C for 24 hours. This is followed by painting one tread surface of the tire with ink, applying a standardized load (the maximum load capacity) to the tire to press it vertically against a piece of cardboard (at a camber angle of 0°), and transferring the ink. A ground contact area refers to the total ground contact area. The total ground contact area can be determined as the average of five areas obtained by performing the transfer process described above at a total of five locations by rotating the tire 72°.

[0037] An "effective contact patch" is the area of ​​the tire's tread where it touches the ground when pressed against it. It is obtained by mounting the tire on a standardized rim, inflating it to a standardized pressure, and leaving it at 25°C for 24 hours. This is followed by coating one tread surface with ink, applying a standardized load (the maximum load capacity) to the tire to press it vertically against a piece of cardboard (at a camber angle of 0°), and transferring the ink. An area of ​​the effective contact patch refers to an effective ground contact area. The effective ground contact area can be determined as the average of five areas obtained by performing the transfer process described above at five locations, rotating the tire by 72°.

[0038] A “lift ratio R” is calculated from a total ground contact area of ​​the ground contact area and an effective ground contact area of ​​the effective ground contact area using the following equation. (Survey ratio) = (effective ground contact area / total ground contact area)

[0039] A "total tread section thickness" refers to the thickness of the entire tread section on a tire equator plane in a cross-section obtained by cutting a tire along a plane containing a tire axis of rotation. Furthermore, an end on an inside surface in a tire radial direction, where "total tread section thickness" refers to an inside surface in the tire radial direction of the rubber compound forming the tread section, and, in a case where the tire includes a belt reinforcement layer, a belt layer, and a carcass layer, the thickness below it is the thickness of the entire rubber layer on the inside surface in the tire radial direction relative to the outermost layer in the tire radial direction.Furthermore, if the tire has circumferential grooves on the equatorial plane, the thickness of the entire tread section is measured assuming that the grooves are filled.

[0040] A "thickness of each rubber layer forming a tread section" is the thickness of each rubber layer on a tire equator plane in a cross-section obtained by cutting a tire along a plane containing a tire axis of rotation, and is an average value of the thicknesses of each rubber layer forming the tread section, as calculated at the five positions by rotating the tire 72° in a circumferential direction. For example, a thickness of a first layer refers to a linear distance in a tire radial direction from an outermost surface of a tread to a first layer interface on an inner surface in a tire radial direction on a tire equator plane.Furthermore, if the tire has a circumferential groove on the tire equator plane, the thickness of each rubber layer forming a tread section is the thickness of each rubber layer at the midpoint of a rib section in a tire width direction closest to the tire equator plane. A "rib section closest to a tire equator plane" refers to a rib section of a circumferential groove that is present on a tire equator plane and has a groove edge that is closest to the tire equator plane. In a case where such a rib section is present on both sidewalls in a tire width direction, the thickness of each rubber layer forming a tread section is the average of the thicknesses of rubber layers at the midpoints of the two rib sections in the tire width direction.Furthermore, in a case where an electrically conductive element or the like is present on a rib section on a tire equator plane and an interface is unclear, a thickness is measured, whereby interfaces blocked by the electrically conductive element or the like are virtually connected to each other.

[0041] A "plasticizer" is a material that imparts plasticity to a rubber component and is a component extracted from a rubber compound using acetone. The plasticizer comprises a plasticizer that is liquid at 25°C and a plasticizer that is solid at 25°C. However, it should not include wax or stearic acid, which are commonly used in the tire industry.

[0042] A "total content P of a plasticizer" also includes any amount of a plasticizer contained in a stretched rubber component that has been previously stretched with the plasticizer, such as an oil, a resin component, a liquid rubber component, and the like. The same applies, for example, to an oil content, a resin component content, and a liquid rubber content; for instance, a stretching oil is included in the oil content if a stretching component is oil. <messverfahren>

[0043] The “thickness of each rubber layer forming a tread section” is measured in a state where a tire is cut on a plane containing a tire axis of rotation and a width of a bead section is matched to a width of a standardized rim.

[0044] "30 °C-tanδ" is a loss tangent measured using a dynamic viscoelasticity measuring device (e.g., EPLEXOR series, manufactured by gabo Systemtechnik GmbH) under conditions of a temperature of 30 °C, a frequency of 10 Hz, an initial strain of 5%, a dynamic strain of ±1%, and a strain mode. A sample for measuring the loss tangent is a vulcanized rubber compound measuring 20 mm in length × 4 mm in width × 1 mm in thickness. If the sample is produced by cutting it from a tire, it is cut from a tread section of the tire such that one tire circumferential direction becomes a long side and one tire radial direction becomes a thickness direction.

[0045] “30 °CE*” is a complex elastic modulus measured using a dynamic viscoelasticity measuring device (e.g., EPLEXOR series, manufactured by gabo Systemtechnik GmbH) under conditions of a temperature of 30 °C, a frequency of 10 Hz, an initial strain of 5%, a dynamic strain of ±1%, and a specific strain mode. A sample for measurement is prepared in a similar manner to that used for the 30 °C tanδ.

[0046] A “modulus at elongation of 200% (M)” 200 )" is a tensile stress (MPa) at 200% elongation in one grain direction (one roll direction if a rubber sheet is formed by extrusion or shear treatment), measured according to JIS K 6251:2017 under a tensile speed of 3.3 mm / sec in an atmosphere at 23 °C. A sample for measuring M 200 is a vulcanized piece of rubber with a thickness of 1 mm in the shape of dumbbell No. 7. When it is produced by cutting it from a tire, it is cut from a tread section of the tire in such a way that a tire circumferential direction becomes a tensile direction and a tire radial direction becomes a thickness direction.

[0047] A “styrene content” is a value calculated by pyrolysis gas chromatography and is applied to a rubber component with a repeating unit derived from styrene, such as an SBR and the like. Furthermore, in this description, “pyrolysis gas chromatography” refers to a process of heating a sample in a pyrolysis apparatus, separating individual components contained in gas-phase components generated by this heating using a separation column, and analyzing each separated component.

[0048] A “vinyl content (cis-1,2-bonded butadiene unit amount)” is a value calculated by infrared absorption spectrometry in accordance with JIS K 6239-2:2017 and applied to a rubber component with a repeating unit derived from butadiene, such as an SBR, a BR and the like.

[0049] A “cis content (cis-1,4-bonded butadiene unit amount)” is a value calculated by infrared absorption spectrometry in accordance with JIS K 6239-2:2017 and is applied to a rubber component with a repeating unit derived from butadiene, such as a BR and the like.

[0050] A "total styrene content in a rubber component" is the total mass-percentage of styrene units contained in 100 mass-percentage of a rubber component. This value is obtained by multiplying a styrene content in mass-percentage by a mass fraction in a rubber component to obtain a calculated value for each of the respective rubber components and then adding these values ​​together. Specifically, it is calculated as Σ (styrene content (mass-percentage) of each styrene-containing rubber × content (mass-percentage) of each styrene-containing rubber in the rubber component / 100).

[0051] A "weight-mean molecular weight (Mw)" can be calculated for a standard polystyrene based on measurements obtained by gel permeation chromatography (GPC) (e.g., GPC-8000 series manufactured by Tosoh Corporation, detector: differential refractometer, column: TSKgel (registered trademark) SuperMultiporeHZ-M manufactured by Tosoh Corporation). It is applied, for example, to an SBR, a BR, a plasticizer, and the like.

[0052] The specific nitrogen adsorption surface area (N2SA) of carbon black is measured according to JIS K 6217-2:2017. The specific nitrogen adsorption surface area (N2SA) of silicon dioxide is measured using the BET method according to ASTM D3037-93.

[0053] An "average primary particle size" is calculated as the arithmetic mean of the particle sizes of 400 particles photographed with a transmission or scanning electron microscope. Regarding particle size, in cases where the particle is substantially circular, the diameter of the circle is defined as the particle size; in cases where it is needle- or rod-shaped, a minor axis is defined as the particle size; and in other cases, an equivalent circular diameter calculated from an electron micrograph is defined as the particle size. The equivalent circular diameter is calculated as the positive square root of 4 × (particle area) / n. The average primary particle size is applied to silicon dioxide, carbon black, etc.

[0054] A “softening point of a resin component” is specified as a temperature at which a ball falls when the softening point defined in JIS K 6220-1:2015 7.7 is measured using a ring-and-ball softening point measuring device.

[0055] A process for producing a tire, which is an embodiment of the present invention, is described in detail below. However, the following descriptions are for illustrative purposes only and are not intended to limit the technical scope of the present invention to this description. [Tires]

[0056] In the tire according to the present embodiment, the ratio (G / W) is L ) of the tire weight G in kg to the maximum load capacity W L in kg, considering the effects of the present invention, 0.0140 or less, preferably 0.0137 or less, more preferably 0.0135 or less, and even more preferably 0.0133 or less. On the other hand, a lower limit of the G / W is L From the perspective of the effects of the present invention, the possible values ​​are not particularly limited, but can be, for example, 0.0110 or more, 0.0115 or more, 0.0120 or more, or 0.0125 or more. Furthermore, the tire weight G can be changed by a conventional method; that is, it can be increased by increasing the specific gravity of the tire or by increasing the thickness of each element of the tire, and it can be decreased by decreasing the specific gravity of the tire or by decreasing the thickness of each element of the tire.

[0057] The maximum load capacity W L (kg) is preferably 300 or more, more preferably 400 or more, even more preferably 450 or more, and particularly preferably 500 or more, to better demonstrate the effects of the present invention. Furthermore, the maximum load capacity W L (kg) for example, from the point of view of better demonstrating the effects of the present invention, may be 1300 or less, 1200 or less, 1100 or less, 1000 or less, 900 or less, 800 or less, or 700 or less. Furthermore, W L The virtual volume V of the space occupied by the tire can be increased, and it can be decreased by decreasing the virtual volume V of the space occupied by the tire.

[0058] The rise ratio R at the ground contact surface of the tread section is preferably 0.50 or more, further preferably 0.55 or more, and even more preferably 0.60 or more. Furthermore, the rise ratio R is preferably 0.85 or less, more preferably 0.80 or less, and even more preferably 0.75 or less.

[0059] The tread section according to the present embodiment has at least one rubber layer. The tread section according to the present embodiment can be a tread section consisting of a single rubber layer, or it can be a tread section comprising a first layer whose outer surface forms a tread surface, and one or more rubber layers (inner rubber layer) located between the first layer and a belt layer.

[0060] The thickness of the first layer forming the tread surface, in relation to the thickness of the entire tread section, may be, for example, 30% or more, 50% or more, 70% or more, or 90% or more, and the tread section may be one consisting of the first layer forming the tread surface.

[0061] The thickness t1 of the first layer is preferably 2.5 mm or more, more preferably 3.0 mm or more, and even more preferably 3.5 mm or more. Furthermore, the thickness t1 of the first layer is preferably 12.0 mm or less, more preferably 11.0 mm or less, and even more preferably 10.0 mm or less.

[0062] The viscosity of 30°CE* of the rubber composition forming the first layer, from the perspective of the effects of the present invention, is preferably 4.0 MPa or more, more preferably 4.5 MPa or more, even more preferably 5.0 MPa or more, and particularly preferably 5.5 MPa or more. Furthermore, 30°CE* of the rubber composition is preferably 15.0 MPa or less, more preferably 12.0 MPa or less, and even more preferably 11.0 MPa or less. In addition, 30°CE* of the rubber composition can be suitably adjusted depending on the type and proportion of a rubber component, a resin component, oil, etc., which will be described later.

[0063] The 30 °C tanδ of the rubber composition forming the first layer, from the perspective of the effects of the present invention, is preferably 0.25 or less, more preferably 0.22 or less, even more preferably 0.20 or less, even more preferably 0.18 or less, and particularly preferably 0.15 or less. Furthermore, the 30 °C tanδ of the rubber composition is preferably 0.06 or more, more preferably 0.08 or more, even more preferably 0.10 or more, and particularly preferably 0.12 or more. In addition, the 30 °C tanδ of the rubber composition can be suitably adjusted depending on the type and proportions of a rubber component, a resin component, oil, etc., which will be described later.

[0064] M 200 The density of the rubber composition forming the first layer, from the perspective of the effects of the present invention, is preferably 4.0 MPa or more, more preferably 5.0 MPa or more, even more preferably 6.0 MPa or more, and particularly preferably 7.0 MPa or more. Furthermore, M 200 The rubber composition preferably has a tensile strength of 15.0 MPa or less, more preferably 13.0 MPa or less, and even more preferably 11.0 MPa or less. Furthermore, M 200 The rubber composition can be appropriately adapted depending on the types and quantities of rubber components, vulcanized rubber particles, resin components, oil, etc., which will be described later.

[0065] The product (R × P) of the concentration ratio R and the total content P in parts by mass of the plasticizer, based on 100 parts by mass of the rubber component in the rubber composition, is greater than 10.0, preferably 11.0 or more, and further preferably 12.0 or more. On the other hand, an upper limit of R × P is preferably less than 35.0, further preferably less than 30.0, and still more preferably less than 28.0, but is not particularly restricted.

[0066] (R × P) / (G / W L ) is preferably greater than 800, more preferably greater than 900, still more preferably greater than 1,000, still more preferably greater than 1,200, and most preferably greater than 1,400. On the other hand, (R × P) / (G / W) is L ) preferably less than 2,200, further preferably less than 2,000 and still further preferably less than 1,900.

[0067] The ratio (30 °C-tanδ / R) of the 30 °C tanδ of the rubber composition forming the first layer to the loft ratio R is preferably less than 0.60, more preferably less than 0.50, still more preferably less than 0.45, still more preferably less than 0.40, and most preferably less than 0.35. Furthermore, a lower limit of 30 °C tanδ / R is preferably greater than 0.10, more preferably greater than 0.15, still more preferably greater than 0.20, and most preferably greater than 0.25, but it is not particularly restricted to this.

[0068] The ratio (S / R) of the total styrene quantity S in mass % in the rubber component to the saturation ratio R is preferably less than 45, more preferably less than 40, and even more preferably less than 38. On the other hand, a lower limit of S / R is preferably greater than 3.0, more preferably greater than 5.0, and even more preferably greater than 7.0, but it is not particularly restricted to these values.

[0069] M 200 The tanδ of 30 °CE* / 30 °C is preferably 200 or more, more preferably 220 or more, and even more preferably 240 or more. On the other hand, an upper limit of M is 200 × 30 °CE* / 30 °C-tanδ preferably 800 or less, further preferably 700 or less, still more preferably 660 or less and particularly preferably 620 or less, but is not particularly restricted. [Rubber composition]

[0070] In the tire according to the present embodiment, the configuration of the tire and tread section described above interacts with the physical properties of the rubber composition forming the tread section, also described above, to more effectively improve the overall performance in terms of fuel efficiency and abrasion resistance. The rubber composition forming the first layer is described below. <kautschukkomponente>

[0071] In the rubber composition according to the present embodiment, a diene-based rubber is suitably used as one of the rubber components. Examples of diene-based rubbers include, for example, isoprene-based rubber, butadiene rubber (BR), styrene-butadiene rubber (SBR), styrene-isoprene rubber (SIR), styrene-isoprene-butadiene rubber (SIBR), chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), and the like. Furthermore, these diene-based rubbers can be modified rubbers treated with modification groups capable of interacting with fillers such as carbon black, silicon dioxide, and the like, or they can be hydrogenated rubbers obtained by hydrogenating a portion of an unsaturated bond. The diene-based rubber can be used alone, or two or more of them can be used in combination.Furthermore, as a diene-based rubber, a stretched rubber can be used which has previously been stretched with a plasticizer, which will be mentioned later.

[0072] The content of a diene-based rubber in the rubber component is preferably 70 wt% or more, more preferably 80 wt% or more, even more preferably 90 wt% or more, and particularly preferably 95 wt% or more. Furthermore, the rubber component can be one consisting of a diene-based rubber.

[0073] The diene-based rubber is at least one selected from the group consisting of an isoprene-based rubber, a styrene-butadiene rubber (SBR), and a butadiene rubber (BR). The rubber component preferably comprises an SBR, more preferably an SBR and an isoprene-based rubber and / or a BR, more preferably an isoprene-based rubber, a BR, and an SBR, and can be a rubber component consisting of an isoprene-based rubber, an SBR, and a BR. (Isoprene-based rubber)

[0074] Isoprene-based rubber is not particularly restricted; examples include natural rubber (NR), isoprene rubber (IR), refined natural rubber, and the like. Examples of NR include SIR20, RSS#3, TSR20, and the like. Examples of IR include IR2200 and the like. Examples of refined natural rubber include epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), deproteinized natural rubber (DPNR), ultrapure natural rubber (UPNR), grafted natural rubber, and the like. These isoprene-based rubbers can be used alone, or two or more of them can be used in combination.

[0075] From the perspective of the effects of the present invention, the content of an isoprene-based rubber in the rubber component is preferably 60 wt% or less, more preferably 50 wt% or less, even more preferably 40 wt% or less, and particularly preferably 30 wt% or more. Furthermore, a lower limit for the content may be, for example, 1 wt% or more, 3 wt% or more, 5 wt% or more, 7 wt% or more, or 10 wt% or more, but this is not particularly restricted. (BR)

[0076] A rubber (BR) is not particularly restricted, and those commonly used in the tire industry can be employed, such as a BR with a cis content of less than 50 mol% (a cis-poor BR), a BR with a cis content of 90 mol% or more (a cis-rich BR), a rare-earth-based butadiene rubber synthesized using a rare-earth-based catalyst (a rare-earth-based BR), a BR containing a syndiotactic polybutadiene crystal (an SPB-containing BR), a modified BR (a cis-rich modified BR, a cis-poor modified BR), and the like. These BRs can be used individually, or two or more of them can be used in combination.

[0077] For example, cis-rich BR can be those commercially available from Zeon Corporation, UBE Corporation, JSR Corporation, etc. When the cis-rich BR is used, abrasion resistance can be improved. The cis content of the cis-rich BR is preferably 95 mol% or more, more preferably 96 mol% or more, and even more preferably 97 mol% or more. Furthermore, the cis content of the BR is measured using the measurement method described above.

[0078] Modified butadiene rubber (modified BR) can be used appropriately if it is modified at its end and / or main chain with a functional group containing at least one element selected from the group consisting of silicon, nitrogen and oxygen.

[0079] Examples of other modified BRs include those obtained by adding a tin compound after polymerizing 1,3-butadiene with a lithium initiator, with the end further bonded by a tin-carbon bond (tin-modified BR), and the like. Furthermore, the modified BR can be either non-hydrogenated or hydrogenated.

[0080] The weight-average molecular weight (Mw) of a BR is preferably 300,000 or more, more preferably 350,000 or more, and even more preferably 400,000 or more, with regard to abrasion resistance. Furthermore, with regard to crosslink uniformity, etc., it is preferably 2,000,000 or less, and more preferably 1,000,000 or less. The Mw of the BR is also measured using the measurement method described above.

[0081] From the perspective of the effects of the present invention, the content of BR in the rubber component is preferably 50 wt% or less, more preferably 40 wt% or less, even more preferably 30 wt% or less, and particularly preferably 25 wt% or more. Furthermore, a lower limit for the content may be, for example, 1 wt% or more, 3 wt% or more, 5 wt% or more, 7 wt% or more, or 10 wt% or more, but this is not specifically restricted. (SBR)

[0082] The SBR is not particularly restricted; examples include, for instance, an unmodified solution-polymerized SBR (S-SBR), an emulsion-polymerized SBR (E-SBR), modified SBRs (a modified S-SBR, a modified E-SBR), and the like. Examples of modified SBRs include an SBR modified at its end and / or main chain, a modified SBR coupled with tin, a silicon compound, etc. (a modified SBR of condensate or with a branched structure, etc.), and the like. Furthermore, hydrogenated versions of these SBRs (hydrogenated SBRs) and the like can also be used. These SBRs can be used individually, or two or more of them can be used in combination.

[0083] The hydrogenated SBRs can be synthesized by hydrogenating a polymer obtained by polymerizing styrene and a conjugated diene compound using a known method (for example, the method described in JP 2020-79340 A). The order of copolymerization is not particularly restricted, and statistical or block copolymerization can be performed. The hydrogenated SBRs can also be synthesized by copolymerizing monomers, each of which exhibits a structure after hydrogenation.

[0084] Examples of the conjugated diene compound include, for example, 1,3-butadiene, isoprene, 1,3-pentadiene, 2,3-dimethylbutadiene, 2-phenyl-1,3-butadiene, 1,3-hexadiene, and the like. Among these, 1,3-butadiene and isoprene are preferred, and 1,3-butadiene is further preferred. They can be used individually, or two or more of them can be used in combination.

[0085] A hydrogenation rate of the hydrogenated SBR is preferably 40 mol% or more, more preferably 50 mol% or more, even more preferably 60 mol% or more, and particularly preferably 70 mol% or more. Furthermore, a hydrogenation rate of the hydrogenated SBR is preferably 99 mol% or less, and more preferably 98 mol% or less. If it lies within the ranges described above, the effects of the present invention tend to be more readily achieved. As described in Production Example 1, which is described later, the hydrogenation rate can be adjusted by modifying reaction conditions, such as the hydrogen gas supply pressure, the reaction temperature, and the like, during a hydrogenation reaction.Furthermore, the hydrogenation rate refers to a ratio of hydrogenated double bonds on a conjugated diene moiety of a copolymer of styrene and a conjugated diene compound, which is derived from a spectral reduction rate of an unsaturated bonding moiety of a spectrum obtained by measuring . 1 The amount obtained from H-NMR can be calculated.

[0086] According to the present embodiment, both extended and non-extended SBRs can be used. The amount of extension in the extended SBR, that is, the amount of an extension plasticizer contained in the SBR when used, is preferably 10 to 50 parts by mass based on 100 parts by mass of a rubber solids content of the SBR.

[0087] The SBRs listed above can be used individually, or two or more can be used in combination. Examples of SBRs that can be used include those commercially available from Sumitomo Chemical Co., Ltd., JSR Corporation, Asahi Kasei Corporation, Zeon Corporation, ZS Elastomer Co., Ltd., etc.

[0088] The styrene content of an SBR can be suitably selected such that the total styrene content S in the rubber component meets the ranges mentioned later. It is preferably 40 wt% or less, more preferably 37 wt% or less, still more preferably 34 wt% or less, and particularly preferably 30 wt% or less. Furthermore, the styrene content of the SBR is preferably 5 wt% or more, more preferably 7 wt% or more, still more preferably 10 wt% or more, and particularly preferably 12 wt% or more. The styrene content of the SBR is also measured using the measurement method described above.

[0089] The vinyl content of an SBR is preferably 5 mol% or more, more preferably 10 mol% or more, and even more preferably 15 mol% or more, with the aim of ensuring reactivity with silicon dioxide and abrasion resistance. Furthermore, with regard to elongation at break and abrasion resistance, the vinyl content of the SBR is preferably 45 mol% or less, more preferably 40 mol% or less, and even more preferably 35 mol% or less. In addition, the vinyl content of the SBR is measured in this description using the measurement method described above.

[0090] From the perspective of the effects of the present invention, the weight-average molecular weight (Mw) of an SBR is preferably 100,000 or more, more preferably 200,000 or more, and even more preferably 300,000 or more. Furthermore, from the perspective of crosslinking uniformity, it is preferably 2,000,000 or less, more preferably 1,800,000 or less, and even more preferably 1,500,000 or less. The weight-average molecular weight of the SBR is also measured by the measurement method described above.

[0091] The content of an SBR in the rubber component can be suitably selected such that the total styrene content S in the rubber component meets the ranges mentioned later, but is preferably 20 wt% or more, more preferably 30 wt% or more, still more preferably 40 wt% or more, still more preferably 50 wt% or more, and particularly preferably 60 wt% or more. Alternatively, the content of the SBR in the rubber component is preferably 99 wt% or less, more preferably 95 wt% or less, still more preferably 90 wt% or less, and particularly preferably 85 wt% or less.

[0092] From the perspective of the effects of the present invention, the total amount of styrene S in the rubber component is preferably 30 wt% or less, more preferably 27 wt% or less, even more preferably 25 wt% or less, and particularly preferably 22 wt% or more. Furthermore, a lower limit for the total amount of styrene S in the rubber component is, but not specifically limited, preferably 3 wt% or more, more preferably 5 wt% or more, even more preferably 7 wt% or more, and particularly preferably 13 wt% or more. (Other rubber components)

[0093] The rubber component may comprise rubber components other than diene-based rubbers (non-diene-based rubbers), provided they do not impair the effects of the present invention. Non-diene-based rubbers may include rubber components commonly used in the tire industry, such as butyl-based rubber, ethylene propylene rubber, polynorbornene rubber, silicone rubber, polyethylene chloride rubber, fluororubber (FKM), acrylic rubber (ACM), hydrin rubber, and the like. These other rubber components may be used individually, or two or more may be used in combination. Furthermore, the rubber component may or may not include a known thermoplastic elastomer in addition to the rubber components described above. (Rubber component synthesized from recycled / biomass-derived raw material)

[0094] A monomer that is a structural unit of a synthetic rubber, such as IR, BR, SBR, and the like, can be derived from underground resources, such as petroleum, natural gas, and the like, or recycled from a rubber product, such as a tire, and the like, or from a non-rubber product, such as polystyrene, and the like. A monomer obtained through recycling (recycled monomer) is not particularly restricted; examples include recycled polyisoprene, recycled butadiene, recycled aromatic vinyl compounds, and the like. Examples of butadiene include 1,2-butadiene, 1,3-butadiene, and the like. The aromatic vinyl compound described above is not particularly restricted, and examples include styrene and the like.Among these, recycled polyisoprene (a recycled polyisoprene), recycled butadiene (a recycled butadiene) and / or recycled styrene (a recycled styrene) are preferably used as a raw material.

[0095] A process for producing a recycled monomer is not particularly restricted; examples include, for instance, a process for synthesizing a monomer from a recycled naphtha obtained by decomposing a rubber product, such as a tire, etc. Furthermore, a process for producing a recycled naphtha is not particularly restricted and can, for example, be obtained by decomposing a rubber product, such as a tire, etc., under high temperature and high pressure, by decomposing it using microwaves, or by extruding it after mechanical pulverization.

[0096] Furthermore, a monomer that is a structural unit of a synthetic rubber, such as IR, BR, SBR, and the like, can be one derived from biomass. In this description, biomass refers to material derived from natural sources, such as plants and the like. Biomass is not particularly restricted; examples include agricultural, forestry, and fishery products, sugar, wood waste, plant residues after the capture of a useful component, plant-derived ethanol, biomass naphtha, and the like.

[0097] The biomass-derived monomer (biomass monomer) is not particularly restricted; examples include biomass-derived butadiene, biomass-derived aromatic vinyl compounds, and the like. Examples of butadiene include 1,2-butadiene, 1,3-butadiene, and the like. The aromatic vinyl compound described above is not particularly restricted, and examples include styrene and the like. Furthermore, the method of producing a biomass monomer is not particularly restricted; examples include, for instance, one through biological and / or chemical and / or physical transformation of animals and plants, and the like.Microbial fermentation is representative of biological conversion, and examples of chemical and / or physical conversion include conversion due to a catalyst, conversion due to high heat, conversion due to high pressure, conversion due to an electromagnetic wave, conversion due to a critical fluid, and combinations thereof.

[0098] A polymer synthesized from a biomass monomer component (biomass polymer) is not particularly restricted; examples include polybutadiene rubber synthesized from biomass-derived butadiene, aromatic vinyl / butadiene copolymer synthesized from biomass-derived butadiene and / or a biomass-derived aromatic vinyl compound, and the like. Examples of aromatic vinyl butadiene copolymer include, for instance, styrene-butadiene rubber synthesized from biomass-derived butadiene and / or biomass-derived styrene, and the like.

[0099] Whether a polymer raw material is derived from biomass can be determined by pMC (percent modern carbon), measured according to ASTM D6866-10.

[0100] Here, pMC is a ratio of 14 C concentration of a sample to 14 C concentration of a modern standard reference carbon (modern standard reference) and a value used as an index indicating the biomass ratio of a compound. The meaning of this value is mentioned below.

[0101] In 1 mol of carbon atoms (6.02 × 10 23 (Pieces) are approximately 6.02 × 10 11 14 C are present, which are about one trillionth the number of normal carbon atoms. A half-life of 14 C is 5730 years, and 14 Carbon dioxide (C) decreases regularly. It takes 226,000 years for all of them to decay. Thus, in the case of fossil fuels, such as coal, oil, natural gas, and the like, where it is assumed that 226,000 years or more have passed since carbon dioxide was absorbed into the atmosphere by plants to be stored, all of them will decay. 14 Carbon elements, which were present at the beginning of the fixation. Therefore, fossil fuels, such as coal, petroleum, natural gas and the like, do not contain any carbon in the current 21st century. 14 Carbon element. Therefore, chemical substances produced using these fossil fuels as raw materials also contain no carbon. 14 C-element.

[0102] on the other hand 14 C is constantly produced by cosmic rays that cause nuclear reactions in the atmosphere. From this, at 14 C decrease of 14 C due to radioactive decay and the production of 14 C is balanced due to nuclear reactions and is the amount of 14 The temperature C in the Earth's atmospheric environment is constant. Thus, the 14 Carbon concentration of substances derived from biomass resources circulating in the current environment, a value of approximately 1 × 10 -12 Molar percentages are based on total carbon atoms, as described above. Accordingly, by using the difference between these values, a biomass ratio in a given compound can be calculated.

[0103] This 14 C is generally measured as follows. Using accelerator mass spectrometry based on a tandem accelerator, a 13 C concentration ( 13 C / 12 C) and a 14 C concentration ( 14 C / 12 C) measured. During the measurements, a 14 Carbon concentration in a circulating carbon in nature from 1950 as the modern standard reference for the 14 C concentration is used. A standard oxalic acid body provided by the National Institute of Standards and Technology (NIST) is used as a specific reference material. A specific radioactivity of carbon in this oxalic acid (radioactivity intensity of 14 C per gram of carbon) is sorted for each carbon isotope, 13C is corrected to a constant value, and a value corrected for attenuation from 1950 to the measurement date is used as a standard. 14 A carbon concentration value (100%) is used. A ratio of this value to an actual measured value for a sample is called a pMC value.

[0104] Thus, when a rubber is produced from a material derived 100% from biomass, the 14 The carbon concentration typically has a value of approximately 110 pMC; currently, under normal conditions, it often does not reach 100, although there are regional differences and the like. On the other hand, it shows that when this 14 When the carbon concentration of a chemical substance derived from a fossil fuel, such as petroleum, is measured, it will be approximately 0 pMC (for example, 0.3 pMC). This value corresponds to a biomass ratio of 0%, as mentioned above.

[0105] Based on the above, it is suitable in terms of environmental protection to use a material, such as a rubber with a high pMC value, and the like, that is, a material such as a rubber with a high biomass ratio, and the like, for a rubber composition. <Füllstoff>

[0106] The rubber composition according to the present embodiment comprises a filler. The filler according to the present embodiment preferably comprises silicon dioxide, further preferably comprises carbon black and silicon dioxide, and may comprise a filler consisting of carbon black and silicon dioxide. (Silicon dioxide)

[0107] Silicon dioxide is not particularly restricted, and those commonly used in the tire industry can be employed, such as silicon dioxide produced by a dry process (anhydrous silicon dioxide), silicon dioxide produced by a wet process (hydrous silicon dioxide), and the like. The source of silicon dioxide is not particularly restricted and can be, for example, a mineral-derived raw material, such as quartz, a biomaterial-derived raw material, such as rice husks (e.g., silicon dioxide produced from a biomass material, such as rice husks), or silicon dioxide recycled from a silicon dioxide-containing product. Among these, hydrous silicon dioxide produced by a wet process is preferred because it contains many silanol groups.This silicon dioxide can be used alone, or two or more of them can be used in combination.

[0108] Silicon dioxide from a biomass material can be obtained, for example, by burning rice husks to obtain rice husk ash, extracting silicate from the rice husk ash using a sodium hydroxide solution, producing silicon dioxide by reacting the silicate with sulfuric acid in the same way as for conventional wet silicon dioxide, and filtering, washing with water, drying, and pulverizing the silicon dioxide precipitates.

[0109] Silicon dioxide recycled from a product containing silicon dioxide can, for example, be recovered from an electronic component such as a semiconductor, a tire, a product containing silicon dioxide such as a desiccant, a filter material such as diatomaceous earth, etc. Furthermore, the recovery method is not particularly restricted; examples include pyrolysis, decomposition by electromagnetic waves, and the like. Silicon dioxide recovered from an electronic component such as a semiconductor or from a tire is preferred.

[0110] When silicon dioxide crystallizes, it is insoluble in water, and silicic acid, a component of it, cannot be used. Crystallization of silicon dioxide in rice hull ash can be suppressed by controlling the firing temperature and duration (JP 2009-2594 A, Akita Prefectural University Web Journal B / 2019, vol. 6, pp. 216-222 etc.).

[0111] Amorphous silicon dioxide extracted from rice husks can be used, including those commercially available from Wilmar, etc.

[0112] A specific nitrogen adsorption surface area (N2SA) of silicon dioxide is preferably 110 m² from the perspective of ensuring reinforcement and damping properties on a running surface section. 2 / g or more, preferably 140 m 2 / g or more, preferably 170 m 2 / g or more and especially preferably 200 m 2 / g or more. Furthermore, from the perspective of heat generation and processability, it is preferably 350 m³. 2 / g or less, preferably 300 m 2 / g or less and preferably 250 m 2 / g or less. Furthermore, the N2SA of silicon dioxide is measured using the measurement method described above.

[0113] From the perspective of increasing the specific surface area of ​​silicon dioxide to enhance interaction with a rubber component, suppress molecular chain movement, and minimize heat generation, the average primary particle size of silicon dioxide is preferably 20 nm or less, more preferably 18 nm or less, and still more preferably 16 nm or less. From the perspective of silicon dioxide dispersibility, a lower limit for the average primary particle size is preferably 1 nm or more, more preferably 3 nm or more, and still more preferably 5 nm or more, but is not specifically restricted to these values. Furthermore, the average primary particle size of silicon dioxide is measured using the measurement method described above.

[0114] To ensure reinforcing and damping properties in a running surface section, the silicon dioxide content based on 100 parts by mass of the rubber component is preferably 40 parts by mass or more, further preferably 55 parts by mass or more, even more preferably 70 parts by mass or more, even more preferably 75 parts by mass or more, and particularly preferably 80 parts by mass or more. Furthermore, to reduce the specific gravity of the rubber, the content is preferably 140 parts by mass or less, further preferably 120 parts by mass or less, even more preferably 100 parts by mass or less, and particularly preferably 95 parts by mass or less. (Soot)

[0115] Examples of carbon black include, but are not limited to, N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, N762, and the like. A raw material for carbon black can be a biomass material, such as lignin, vegetable oil, and the like, or it can be pyrolysis oil obtained by pyrolyzing a used tire. Furthermore, a method of producing carbon black can be one by combustion, such as in a furnace process, and the like; one by hydrothermal carbonization (HTC); or one by pyrolysis of methane, such as a thermal carbon black process, and the like. Commercially available products include those from Asahi Carbon Co., Ltd., Cabot Japan KK, Tokai Carbon Co., Ltd., Mitsubishi Chemical Corporation, Lion Corporation, NIPPON STEEL Carbon Co. Ltd., Columbia Chemical Corporation, etc.These soots can be used alone, or two or more of them can be used in combination.

[0116] In addition to the soot described above, from the point of view of life cycle assessment, soot can also be used from a biomass material, such as lignin, vegetable oil and the like, or recovered soot obtained by pyrolysis and refining of a product containing soot, such as a tire, and the like.

[0117] In this description, "recovered carbon black" refers to carbon black obtained by pulverizing a product such as a used tire containing carbon black and the like, and burning the pulverized product. When the product is subjected to oxidative combustion by heating in air using a thermal weight measurement method in accordance with JIS K 6226-2:2003, the ratio of mass to ash (ash content), which is a non-combustible component, is 13% by mass or more. That is, the ratio of mass (amount of carbon) to weight loss due to the oxidative combustion of the recovered carbon black is 87% by mass or less. The recovered carbon black can be expressed as rCB.

[0118] The recovered carbon black can be obtained from a pyrolysis process of a used pneumatic tire. EP3427975 A, for example, describes, with reference to “Rubber Chemistry and Technology”, Vol. 85, No. 3, pages 408 to 449 (2012), in particular pages 438, 440 and 442, that the recovered carbon black can be obtained by pyrolysis of an organic material at 550 to 800 °C in the absence of oxygen or by vacuum pyrolysis at a relatively low temperature (

[0027] ). As mentioned in

[0004] of JP 6856781 B (A comparison of surface morphology and chemistry of pyrolytic carbon blacks with commercial carbon blacks, Powder Technology 160 (2005) 190-193), such carbon black obtained by the pyrolysis process typically lacks a functional group on its surface.

[0119] The recovered carbon black may lack a functional group on its surface, or it may be treated so that its surface includes a functional group. The treatment, which is carried out so that the surface of the recovered carbon black includes a functional group, can be implemented by a conventional method. For example, in EP3173251 A, carbon black comprising a hydroxyl and / or carboxyl group on its surface is obtained by treating carbon black obtained from a pyrolysis process with potassium permanganate under acidic conditions. Furthermore, in JP 6856781 B, carbon black with an activated surface is obtained by treating carbon black obtained from a pyrolysis process with an amino acid compound comprising at least one thiol or disulfide group. The recovered carbon black according to the present embodiment also includes carbon black whose surface has been treated to include a functional group.

[0120] The recovered carbon black can be that which is commercially available from Strebl Green Carbon Pte Ltd., LDC Co., Ltd. etc.

[0121] A specific nitrogen adsorption surface area (N2SA) of soot is preferably 50 m² 2 / g or more, preferably 80 m 2 / g or more and preferably 100 m 2 / g or more, considering weather resistance and reinforcing properties. Furthermore, it is preferably 250 m 2 / g or less and preferably 220 m 2 / g or less from the perspective of dispersibility, fuel efficiency, fracture properties, and durability. Furthermore, the N2SA of soot is measured using the measurement method described above.

[0122] The carbon black content, when combined, based on 100 parts by mass of the rubber component, is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more, from the perspective of weather resistance and reinforcing properties. Furthermore, from the perspective of fuel efficiency, it is preferably 30 parts by mass or less, more preferably 25 parts by mass or less, even more preferably 20 parts by mass or less, and particularly preferably 15 parts by mass or less. (Other fillers)

[0123] Fillers other than silicon dioxide and carbon black are not particularly restricted, and those conventionally and commonly used in the tire industry, such as aluminum hydroxide, alumina (aluminum oxide), calcium carbonate, magnesium sulfate, talc, clay, biochar (BIOCHAR), and the like, are permitted. These other fillers can be used alone, or two or more of them can be used in combination.

[0124] The ratio of carbon black to silicon dioxide content is preferably 0.40 or less, more preferably 0.30 or less, even more preferably 0.21 or less, even more preferably 0.17 or less, even more preferably 0.13 or less, and most preferably 0.10 or less. Fuel efficiency can be further improved if the ratio of carbon black to silicon dioxide content is within the ranges described above. On the other hand, there is no particular restriction on the lower limit of the ratio of carbon black to silicon dioxide content, and it may, for example, be 0.01 or more, 0.02 or more, or 0.05 or more, with the filler possibly not including carbon black.

[0125] For the purpose of ensuring reinforcing and damping properties in a tread section, the total filler content based on 100 parts by mass of the rubber component is preferably 50 parts by mass or more, more preferably 60 parts by mass or more, even more preferably 70 parts by mass or more, and particularly preferably 80 parts by mass or more. For the purposes of the effects of the present invention, it is preferably 140 parts by mass or less, more preferably 120 parts by mass or less, even more preferably 100 parts by mass or less, and particularly preferably 95 parts by mass or less. (Silane coupling agent)

[0126] Silicon dioxide is preferably used in combination with a silane coupling agent. The silane coupling agent is not particularly restricted, and any silane coupling agent conventionally used in the tire industry in combination with silicon dioxide may be used. However, one or more silane coupling agents selected from the group consisting of sulfide-based and mercapto-based silane coupling agents are preferred, and mercapto-based silane coupling agents are further preferred from the perspective that a desired effect can be obtained more readily.

[0127] Examples of sulfide-based silane coupling agents include bis(3-triethoxysilylpropyl)disulfide, bis(3-triethoxysilylpropyl)tetrasulfide, and the like. These sulfide-based silane coupling agents can be used alone, or two or more of them can be used in combination.

[0128] In this description, the mercapto-based silane coupling agent refers to one having a mercapto group, and the mercapto coupling agent refers to one having a structure in which the mercapto group is protected by a protecting group. Examples of the mercapto-based silane coupling agent include, for example, a compound having a mercapto group represented by the following formula (2), a compound having a mercapto group represented by the following formula (3) protected by an ester, a compound comprising a bonding unit A represented by the following formula (4) and / or a bonding unit B represented by the following formula (5), and the like, but are not particularly limited.Among these, for the reason that the effects of the present invention can be better demonstrated, the compound represented by the following chemical formula (3), or the compound comprising a bonding unit A represented by the following formula (4), and / or a bonding unit B represented by the following formula (5), is preferred, and the compound represented by the following formula (3) is further preferred. These mercapto-based silane coupling agents can be used alone, or two or more of them can be used in combination. (where x represents an integer of 0 or more; y represents an integer of 1 or more; R. 201 hydrogen atom or an alkyl with 1 to 30 carbon atoms, an alkenyl with 2 to 30 carbon atoms or an alkynyl with 2 to 30 carbon atoms (the alkyl, the alkenyl and the alkynyl can optionally be replaced by a halogen atom, hydroxyl or carboxyl); and R 202 an alkylene with 1 to 30 carbon atoms, an alkenylene with 2 to 30 carbon atoms, or an alkynylene with 2 to 30 carbon atoms; where R 201 and R 202 together they can form a ring structure.)

[0129] Examples of the compound represented by formula (2) include, for example, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, a compound represented by the following formula (6) (Si363, manufactured by Evonik Industries AG), and the like. The compound represented by the following formula (6) can be used appropriately. It can be used alone, or two or more of it can be used in combination.

[0130] Examples of the compound represented by formula (3) include, for example, 3-octanoylthio-1-propyltriethoxysilane, 3-hexanoylthio-1-propyltriethoxysilane, 3-octanoylthio-1-propyltrimethoxysilane and the like.

[0131] In the compound comprising bonding unit A represented by formula (4) and / or bonding unit B represented by formula (5) described above, an increase in viscosity during processing is suppressed compared to a sulfide-based silane coupling agent, such as bis(3-triethoxysilylpropyl)tetrasulfide and the like. Therefore, the dispersibility of silicon dioxide is improved, and it is assumed that fuel efficiency, wet adhesion performance, and elongation at break are further enhanced. This is thought to be because a sulfide portion of bonding unit A is a CSC bond and is thus thermally stable compared to tetrasulfide or disulfide, resulting in a small increase in Mooney viscosity.

[0132] To suppress an increase in viscosity during processing, the content of binding unit A is preferably 30 to 99 mol% and more preferably 50 to 90 mol%. Furthermore, the content of binding unit B is preferably 1 to 70 mol%, more preferably 5 to 65 mol%, and still more preferably 10 to 55 mol%. The total content of binding units A and B is preferably 95 mol% or more, more preferably 98 mol% or more, and most preferably 100 mol%. The content of binding units A and B is also an amount that includes a case in which the binding units A and B are located at the end of the silane coupling agent. A form in which the binding units A and B are located at the end of the silane coupling agent is not particularly restricted, as long as it forms units corresponding to formula (4), which represents binding unit A, and formula (5), which represents binding unit B.

[0133] In the compound comprising bonding unit A represented by formula (4) and bonding unit B represented by formula (5), the total number (x + y) of the number of repetitions of bonding unit A (x) and the number of repetitions of bonding unit B (y) preferably lies within a range of 3 to 300. If it lies within this range, the mercaptosilane of bonding unit B is -C7H 15 The bonding unit A is covered, so that a reduction in combustion time can be suppressed and good reactivity with silicon dioxide and rubber components can be ensured.

[0134] Examples of the compound comprising bonding unit A represented by formula (4) and / or bonding unit B represented by formula (5) include, for example, NXT-Z30, NXT-Z45, NXT-Z60, and NXT-Z100, manufactured by Momentive Performance Materials and the like. They can be used individually, or two or more of them can be used in combination.

[0135] Silane coupling agents other than sulfide-based and mercapto-based silane coupling agents are not particularly restricted. Examples include vinyl-based silane coupling agents, such as vinyltriethoxysilane and vinyltrimethoxysilane; amino-based silane coupling agents, such as 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, and 3-(2-aminoethyl)aminopropyltriethoxysilane; glycidoxy-based silane coupling agents, such as γ-glycidoxypropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane; nitro-based silane coupling agents, such as 3-nitropropyltrimethoxysilane and 3-nitropropyltriethoxysilane; chlorine-based silane coupling agents, such as 3-chloropropyltrimethoxysilane and 3-chloropropyltriethoxysilane; and the like. These other silane coupling agents can be used alone, or two or more of them can be used in combination.Examples of silane coupling agents that can be used include those listed above, which are manufactured and sold by Momentive Performance Materials, Evonik Industries AG, etc.

[0136] From the perspective of enhancing the dispersibility of silicon dioxide, the content of a silane coupling agent based on 100 parts by mass of silicon dioxide is preferably 1.0 parts by mass or more, more preferably 3.0 parts by mass or more, and even more preferably 5.0 parts by mass or more. Furthermore, from the perspective of cost and processability, it is preferably 20 parts by mass or less, more preferably 15 parts by mass or less, and even more preferably 12 parts by mass or less. <weichmacher>

[0137] The rubber composition according to the present embodiment comprises a plasticizer. The plasticizer according to the present embodiment comprises at least one selected from the group consisting of a hydrogenated resin component and a vegetable oil, and may further comprise other plasticizers. A hydrogenated resin based on dicyclopentadiene is suitably used as the hydrogenated resin component. Examples of other plasticizers include, for example, a non-hydrogenated resin component, oil, liquid rubber, an ester-based plasticizer, and the like. These plasticizers may be those derived from mineral resources, such as petroleum, natural gas, and the like, or those derived from naphtha recycled from a rubber product or from a non-rubber product.Furthermore, a low molecular weight hydrocarbon component obtained by pyrolysis and extraction from a used tire or a product comprising various components can be used as a plasticizer. These plasticizers can be used alone, or two or more can be used in combination. (resin component)

[0138] The rubber composition according to the present embodiment may include a resin component. The resin component that may be used in the present embodiment is not particularly restricted, and any resin commonly used in the tire industry may be used. Examples include, for instance, a C9-based resin, a C5-based resin, a C5 / C9-based resin, a dicyclopentadiene-based resin, an aromatic vinyl-based resin, a coumaron-based resin, an indene-based resin, a terpene-based resin, a rosin-based resin, a phenol-based resin, and the like. These resin components may be used individually, or two or more of them may be used in combination. Each resin component may also be used individually, or two or more of them may be used in combination. <<Harz auf C9-Basis> >

[0139] A "C9-based resin" refers to a resin obtained by polymerizing C9 fractions and can be a polymer obtained by polymerizing a C9 fraction alone, or a copolymer obtained by copolymerizing a C9 fraction with other components. For example, a resin obtained by copolymerizing dicyclopentadiene (DCPD) with a C9 fraction is called a DCPD / C9 resin. Furthermore, a C9-based resin can be one obtained by hydrogenating or modifying it. Examples of C9 fractions include petroleum fractions with 8 to 10 carbon atoms, such as vinyltoluene, alkylstyrene, coumaron, indene, methylindene, dicyclopentadiene, and the like. Examples of C9-based resins include those commercially available from BASF, Zeon Corporation, ENEOS Corporation, etc. <<Harz auf C5-Basis> >

[0140] A "C5-based resin" refers to a resin obtained by polymerizing C5 fractions, and can be one obtained by hydrogenating or modifying them. Examples of C5 fractions other than dicyclopentadiene include petroleum fractions with 4 to 5 carbon atoms, such as cyclopentadiene, isoprene, piperylene, 2-methyl-1-butene, 2-methyl-2-butene, 1-pentene, and the like. Examples of C5-based resins that can be used include those commercially available from STRUKTOL, Zeon Corporation, ENEOS Corporation, etc. <<Harz auf C5 / C9-Basis> >

[0141] A "C5 / C9-based resin" refers to a resin obtained by copolymerizing the C5 and C9 fractions, and can be one obtained by hydrogenation or modification thereof. For example, suitable C5 / C9-based petroleum resins include those commercially available from Tosoh Corporation, Zibo Luhua Hongjin New Material Group Co., Ltd. <<Harz auf Dicyclopentadien-Basis> >

[0142] A "dicyclopentadiene-based resin" refers to a resin that contains cyclopentadiene (CPD) and / or dicyclopentadiene (DCPD) as the predominant monomer component and may be one obtained by hydrogenation or modification thereof. Examples of dicyclopentadiene-based resins include polymers obtained by polymerizing only dicyclopentadiene as a monomer, copolymers obtained by copolymerizing dicyclopentadiene with the C9 fraction (DCPD / C9 resin), and similar formulations. Examples of dicyclopentadiene-based resins that can be used include those commercially available from Exxon Mobil Corporation, ENEOS Corporation, Zeon Corporation, Maruzen Petrochemical Co., Ltd., etc. <<Harz auf aromatischer Vinyl-Basis> >

[0143] An "aromatic vinyl-based resin" refers to a resin that incorporates an aromatic vinyl compound, such as styrene, α-methylstyrene, vinyltoluene, p-chlorostyrene, and the like, as a monomer component with the highest concentration, and may be one obtained by hydrogenation or modification thereof. A homopolymer of α-methylstyrene or styrene, or a copolymer of α-methylstyrene and styrene, is preferred as the aromatic vinyl-based resin, and a copolymer of α-methylstyrene and styrene is further preferred because it is economical, easy to process, and has excellent heat generation properties. Examples of aromatic vinyl-based resins that can be used include those commercially available from Kraton Corporation, Eastman Chemical Company, Mitsui Chemicals, Inc., etc. <<Harz auf Cumaron-Basis> >

[0144] A "coumaron-based resin" refers to a resin that includes coumaron as a monomer component and may be one obtained by hydrogenating or modifying it. Examples of preferred coumaron-based resins include a coumaron resin that is a polymer containing only coumaron as a monomer component, a coumaron-indene resin that is a copolymer containing coumaron and indene as monomer components, a coumaron-indene-styrene resin that is a copolymer containing coumaron, indene, and styrene as monomer components, and the like. Examples of suitable coumaron-based resins include those commercially available from Rutgers Chemicals, Nitto Chemical Co., Ltd., Mitsui Chemicals, Inc., etc. <<Harz auf Inden-Basis> >

[0145] An "indene-based resin" refers to a resin that includes indene as a monomer component and can be one obtained by hydrogenating or modifying it. Examples of indene-based resins include a coumaron-indene resin, which is a copolymer containing coumaron and indene as monomer components; a coumaron-indene-styrene resin, which is a copolymer containing coumaron, indene, and styrene as monomer components; and similar resins. Examples of indene-based resins that can be used include those commercially available from Rutgers Chemicals, Nitto Chemical Co., Ltd., Mitsui Chemicals, Inc., etc. <<Harz auf Terpen-Basis> >

[0146] A "terpene-based resin" refers to a resin that incorporates a terpene compound, such as α-pinene, β-pinene, limonene, dipentene, and the like, as a monomer component, and may be one obtained by hydrogenation or modification thereof. Preferred examples of terpene-based resins include a polyterpene resin, which is a polymer comprising only one or more of the terpene compounds as monomer components; an aromatically modified terpene resin, which is a copolymer comprising the terpene compound and an aromatic compound as monomer components; a terpenophenolic resin, which is a copolymer comprising the terpene compound and a phenolic compound as monomer components; and the like. Examples of aromatic compounds used as monomer components for aromatically modified terpene resins include styrene, α-methylstyrene, vinyltoluene, divinyltoluene, and the like.Examples of phenolic compounds used as monomer components for terpene phenolic resin include phenol, bisphenol A, cresol, xylenol, and the like. Terpene-based resins that can be used include those commercially available from companies such as Yasuhara Chemical Co., Ltd., Arakawa Chemical Industries, Ltd., and Nippon Terpene Chemicals, Inc. <<Harz auf Kolophonium-Basis> >

[0147] A "rosin-based resin" refers to a resin containing a rosin acid compound, such as abietic acid, neoabietic acid, palustric acid, isopimaric acid, and the like, and may be one obtained by hydrogenation or modification thereof. Examples of rosin-based resins include, for instance, natural resin rosin and rosin-modified resins obtained by modifying natural resin rosin through hydrogenation, disproportionation, dimerization, esterification, etc., but are not particularly limited. Examples of rosin-based resins include those commercially available from Harima Chemicals Group, Inc., Arakawa Chemical Industries, Ltd., IREC Co., Ltd., etc. <<Harz auf Phenol-Basis> >

[0148] A "phenol-based resin" refers to a resin that incorporates a phenolic compound, such as phenol, cresol, and the like, as a monomer component, and may be one obtained by hydrogenation or modification thereof. Examples of phenol-based resins include, but are not limited to, phenol-formaldehyde resins, alkylphenol-formaldehyde resins, alkylphenol-acetylene resins, oil-modified phenol-formaldehyde resins, terpene phenol resins, and the like. Examples of phenol-based resins include those commercially available from Sumitomo Bakelite Co., Ltd., DIC Corporation, ASAHI YUKIZAI CORPORATION, etc.

[0149] From the perspective of adhesion performance, the softening point of the resin component is preferably 60 °C or higher, more preferably 70 °C or higher, and even more preferably 80 °C or higher. Furthermore, from the perspective of processability and improved dispersibility of a rubber component with a filler, it is preferably 150 °C or lower, more preferably 140 °C or lower, and even more preferably 130 °C or lower. The softening point of the resin component is also measured using the measurement method described above.

[0150] The content of a hydrogenated resin component, when combined, based on 100 parts by mass of the rubber component, is, from the perspective of the effects of the present invention, preferably 1 part by mass or more, more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more. Furthermore, the content is preferably 40 parts by mass or less, more preferably 35 parts by mass or less, and even more preferably 30 parts by mass or less.

[0151] The content of a resin component based on 100 parts by mass of the rubber component (a total quantity of several resin components when used in combination) is, from the perspective of the effects of the present invention, preferably 1 part by mass or more, more preferably 3 parts by mass or more, even more preferably 5 parts by mass or more, and particularly preferably 7 parts by mass or more. Furthermore, the content is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and even more preferably 30 parts by mass or less. (Oil)

[0152] Examples of oil include mineral oil, vegetable oil, animal oil, and the like. Furthermore, from a life cycle assessment perspective, those obtained by cleaning used oil after use in a rubber mixer or engine, or used cooking oil from a restaurant, can be considered.

[0153] In this description, a mineral oil refers to oil derived from mineral resources such as petroleum, natural gas, and the like. Examples of mineral oil include paraffinic oils (mineral oils), naphthenic oils, aromatic oils, and the like. Specific examples of mineral oil include, for example, Mild Extracted Solvate (MES), Distillate Aromatic Extract (DAE), Treated Distillate Aromatic Extract (TDAE), Treated Residual Aromatic Extract (TRAE), Residual Aromatic Extract (RAE), and the like. Furthermore, as an environmental measure, an oil with a low content of polycyclic aromatic compounds (PCAs) may also be used. Examples of oils with a low PCA content include MES, TDAE, heavy naphthenic oil, and the like.

[0154] In this description, examples of "vegetable oil" include, for example, linseed oil, rapeseed oil, safflower oil, soybean oil, corn oil, cottonseed oil, rice oil, tall oil, sesame oil, perilla 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, grapeseed oil, Japan wax, and the like. Furthermore, examples of vegetable oil also include refined oils obtained by refining the oils described above (cooking oils, etc.).), a transesterified oil obtained by transesterifying the oil described above, a hydrogenated oil obtained by hydrogenating the oil described above, a thermally polymerized oil obtained by thermally polymerizing the oil described above, an oxidized polymerized oil obtained by oxidizing the oil described above, a used cooking oil obtained by restoring what was previously used as an edible oil, etc., and the like. Furthermore, the vegetable oil may be liquid or solid at 25°C. These vegetable oils may be used individually, or two or more of them may be used in combination.

[0155] The vegetable oil according to the present embodiment preferably comprises acylglycerol and further preferably comprises triacylglycerol. In this description, acylglycerol also refers to a compound in which a hydroxyl group of glycerol and a fatty acid are ester-bound. Acylglycerol is not particularly restricted and may be 1-monoacylglycerol, 2-monoacylglycerol, 1,2-diacylglycerol, 1,3-diacylglycerol, or triacylglycerol. Furthermore, acylglycerol may be a monomer, a dimer, or a multimer that is a trimer or higher. Acylglycerol that is a dimer or higher may also be obtained by thermal polymerization, oxidative polymerization, or the like. Finally, acylglycerol may be liquid or solid at 25 °C.

[0156] One method of verifying whether the rubber composition includes the acylglycerol described above can be carried out, for example, by 1 H-NMR measurements can be performed below, but are not particularly limited to this. In particular, a heavy chloroform is used, into which a rubber composition containing triacylglycerol is immersed at room temperature (25 °C) for 24 hours and then removed. 1 Subjected to 1H NMR at room temperature, signals near 5.26 ppm, near 4.28 ppm, and near 4.15 ppm were observed under a condition where a signal from tetramethylsilane (TMS) was set to 0.00 ppm. It is suggested that the signals are derived from hydrogen atoms bonded to carbon atoms adjacent to oxygen atoms of an ester group. Furthermore, "near" in this paragraph refers to a range of ±0.10 ppm.

[0157] The fatty acid described above is not particularly restricted and can be either an unsaturated or a saturated fatty acid. Examples of unsaturated fatty acids include monounsaturated fatty acids, such as oleic acid, and the like, and polyunsaturated fatty acids, such as linoleic acid, linolenic acid, and the like. Furthermore, examples of saturated fatty acids include butyric acid, lauric acid, and the like.

[0158] The desired fatty acid is one with few double bonds, meaning a saturated or monounsaturated fatty acid, and oleic acid is preferred. A vegetable oil containing such a fatty acid can be, for example, a saturated or monounsaturated fatty acid, or it can be a vegetable oil modified by transesterification or similar processes. Furthermore, to produce a vegetable oil containing such a fatty acid, a plant can be improved through selective breeding, gene combination, or similar methods.

[0159] For example, vegetable oils that are commercially available from Idemitsu Kosan Co., Ltd., Sankyo Yuka Kogyo KK, ENEOS Corporation, Olisoy, H&R Group, Hokoku Corporation, Fuji Kosan Co., Ltd., The Nisshin OilliO Group, Ltd., etc., can be used.

[0160] Examples of animal oil include fish oil, beef tallow, oleyl alcohol derived from it, or the like.

[0161] The content of an unsaturated fatty acid contained in the fatty acid component of the vegetable oil is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, even more preferably 75% by mass or more, even more preferably 80% by mass or more and particularly preferably 85% by mass or more.

[0162] The vegetable oil content, when combined, based on 100 parts by mass of the rubber component, is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more, from the perspective of the effects of the present invention. Furthermore, the content is preferably 30 parts by mass or less, more preferably 25 parts by mass or less, and even more preferably 20 parts by mass or less.

[0163] From the perspective of the effects of the present invention, the oil content based on 100 parts by mass of the rubber component (a total quantity of several oils when used in combination) is preferably 1 part by mass or more, more preferably 3 parts by mass or more, even more preferably 5 parts by mass or more, and particularly preferably 7 parts by mass or more. Furthermore, the content is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and even more preferably 30 parts by mass or less.

[0164] A liquid rubber is not particularly restricted as long as it is a polymer in a liquid state at 25 °C. Examples include liquid butadiene rubber (liquid BR), liquid styrene-butadiene rubber (liquid SBR), liquid isoprene rubber (liquid IR), liquid styrene-isoprene rubber (liquid SIR), liquid farnesene rubber, and the like. These liquid rubbers can be used individually, or two or more of them can be used in combination.

[0165] Examples of ester-based plasticizers include dibutyl adipate (DBA), diisobutyl adipate (DIBA), dioctyl adipate (DOA), bis(2-ethylhexyl) azelate (DOZ), dibutyl sebacate (DBS), diisononyl adipate (DINA), diethyl phthalate (DEP), dioctyl phthalate (DOP), diundecyl phthalate (DUP), dibutyl phthalate (DBP), dioctyl sebacate (DOS), tributyl phosphate (TBP), trioctyl phosphate (TOP), triethyl phosphate (TEP), trimethyl phosphate (TMP), thymidine triphosphate (TTP), tricresyl phosphate (TCP), trixylenyl phosphate (TXP), and the like. These ester-based plasticizers can be used alone, or two or more of them can be used in combination.

[0166] A total content P of a plasticizer based on 100 parts by mass of the rubber component (a total amount of several plasticizers when used in combination) is, from the perspective of compliance with a road surface, preferably 15 parts by mass or more, further preferably 20 parts by mass or more, even more preferably 25 parts by mass or more, and particularly preferably more than 30 parts by mass. Furthermore, from the perspective of fuel efficiency, it is preferably 100 parts by mass or less, further preferably 80 parts by mass or less, even more preferably 60 parts by mass or less, and particularly preferably 50 parts by mass or less. (Other connecting means)

[0167] The rubber composition according to the present embodiment may, in addition to the components described above, suitably include bonding agents that are conventionally and generally used in the tire industry, for example a vulcanized rubber particle, processing aids, wax, stearic acid, zinc oxide, an antioxidant, a vulcanizing agent, a vulcanization accelerator and the like.

[0168] A vulcanized rubber particle is a particle made from vulcanized rubber, and in particular, rubber powder and the like, as specified in JIS K 6316:2017, may be used. From the standpoint of environmental considerations and cost, recycled rubber powder produced from a pulverized end-of-life tire or the like is preferred. They may be used alone, or two or more may be used in combination.

[0169] The vulcanized rubber particle is not particularly restricted and can be either unmodified or modified vulcanized rubber. Commercially available vulcanized rubber products include those from Lehigh Technologies, Muraoka Rubber Reclaiming Co., Ltd., etc.

[0170] The content of a vulcanized rubber particle, when bonded, based on 100 parts by mass of the rubber component, can, for example, be appropriately adjusted within a range of more than 1 part by mass and less than 80 parts by mass.

[0171] Examples of processing aids include, for example, a fatty acid metal salt, a fatty acid amide, an amide ester, a silicon dioxide surface activator, a fatty acid ester, a mixture of a fatty acid metal salt and an amide ester, a mixture of a fatty acid metal salt and a fatty acid amide, and the like. Processing aids that can be used include those commercially available from Schill+Seilacher GmbH, Performance Additives, etc. These processing aids can be used individually, or two or more of them can be used in combination.

[0172] The amount of processing aids, when combined, based on 100 parts by mass of the rubber component, is preferably greater than 0.5 parts by mass, more preferably greater than 1 part by mass, and still more preferably greater than 1.5 parts by mass, in order to demonstrate an effect of improving processability. Furthermore, in order to improve abrasion resistance and fracture toughness, it is preferably less than 10 parts by mass, more preferably less than 8.0 parts by mass, and still more preferably less than 5.0 parts by mass.

[0173] The type of wax is not particularly restricted, and any wax commonly used in the tire industry may be suitable. Examples include mineral-based waxes, plant-derived waxes, and the like. Mineral-based waxes refer to waxes derived from mineral resources such as oil, natural gas, and the like. Plant-derived waxes refer to waxes derived from natural resources such as plants, and the like. Mineral-based waxes are preferred. Examples of plant-derived waxes include rice wax, carnauba wax, candelilla wax, and the like. Examples of mineral-based waxes include paraffin wax, microcrystalline wax, specially selected waxes thereof, and the like. Paraffin wax is preferred.Furthermore, according to the present embodiment, the wax should not contain stearic acid. For example, waxes commercially available from Ouchi Shinko Chemical Industry Co., Ltd., Nippon Seiro Co., Ltd., Paramelt BV, etc., can be used. These waxes can be used individually, or two or more can be used in combination.

[0174] The wax content, when combined, based on 100 parts by mass of the rubber component, is preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and even more preferably 1.5 parts by mass or more, from the perspective of improving the weather resistance of the rubber. Furthermore, from the perspective of preventing the whitening of a tire due to blooming, it is preferably 10 parts by mass or less, and more preferably 5.0 parts by mass or less.

[0175] Examples of the antioxidant include, but are not limited to, a naphthylamine-based antioxidant such as phenyl-α-naphthylamine and the like; a diphenylamine-based antioxidant such as an octylated diphenylamine, 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine and the like; p-phenylenediamine-based antioxidants, such as N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD), 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), N,N'-di-2-naphthyl-p-phenylenediamine (DNPD), and the like; a quinoline-based antioxidant, such as a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline and the like;A monophenol-based antioxidant, such as 2,6-di-t-butyl-4-methylphenol, a styrenized phenol, and the like; bis-, tris-, and polyphenol-based antioxidants, such as tetrakis-[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane and the like. Among these, p-phenylenediamine-based and quinoline-based antioxidants are preferred, and polymers of N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine and 2,2,4-trimethyl-1,2-dihydroquinoline are further preferred. Commercially available products may include, for example, those manufactured by Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Industry Co., Ltd., Flexsys, etc. These antioxidants can be used alone, or two or more of them can be used in combination.

[0176] The content of an antioxidant, when combined, based on 100 parts by mass of the rubber component, is preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and even more preferably 1.5 parts by mass or more, with regard to the ozone crack resistance of a rubber. Furthermore, with regard to abrasion resistance and wet adhesion performance, it is preferably 10 parts by mass or less, and more preferably 5.0 parts by mass or less.

[0177] The stearic acid content, when combined, based on 100 parts by mass of the rubber component, is preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and even more preferably 1.5 parts by mass or more, from the point of view of processability. Furthermore, from the point of view of vulcanization rate, it is preferably 10 parts by mass or less, and more preferably 5.0 parts by mass or less.

[0178] The zinc oxide content, when combined, based on 100 parts by mass of the rubber component, is preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and even more preferably 1.5 parts by mass or more, from the point of view of processability. Furthermore, from the point of view of abrasion resistance, it is preferably 10 parts by mass or less, and more preferably 5.0 parts by mass or less.

[0179] Sulfur is suitable for use as a vulcanizing agent. Suitable forms of sulfur include powdered sulfur, oil-processing sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, and the like.

[0180] When combined as a vulcanizing agent, the sulfur content, based on 100 parts by mass of the rubber component, is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, and even more preferably 1.0 parts by mass or more, to ensure a sufficient vulcanization reaction. Furthermore, to prevent deterioration, it is preferably 5.0 parts by mass or less, more preferably 4.0 parts by mass or less, and even more preferably 3.5 parts by mass or less. Additionally, when an oil-based sulfur is used as the vulcanizing agent, the content of the vulcanizing agent is said to be the total content of pure sulfur contained in the oil-based sulfur.

[0181] Examples of vulcanizing agents other than sulfur include, for example, an alkylphenol-sulfur chloride condensate, sodium hexamethylene 1,6-bisthiosulfate dihydrate, 1,6-bis(N,N'-dibenzylthiocarbamoyldithio)hexane, and the like. These alternative vulcanizing agents include those commercially available from Taoka Chemical Co., Ltd., LANXESS, Flexsys, etc.

[0182] Examples of vulcanization accelerators include, for example, a sulfenamide-based vulcanization accelerator, a thiazole-based vulcanization accelerator, a guanidine-based vulcanization accelerator, a thiuram-based vulcanization accelerator, a dithiocarbamate-based vulcanization accelerator, a caprolactam disulfide, and the like. These vulcanization accelerators can be used alone, or two or more of them can be used in combination.These include one or more vulcanization accelerators selected from the group consisting of a sulfenamide-based vulcanization accelerator, a thiazole-based vulcanization accelerator, and a guanidine-based vulcanization accelerator, which is preferred, and a combination of a sulfenamide-based vulcanization accelerator and a guanidine-based vulcanization accelerator is further preferred from the point of view that a desired effect can be obtained more suitablely.

[0183] Examples of sulfenamide-based vulcanization accelerators include, for example, N-tert-butyl-2-benzothiazolylsulfenamide (TBBS), N-cyclohexyl-2-benzothiazolylsulfenamide (CBS), N,N-dicyclohexyl-2-benzothiazolylsulfenamide (DCBS), and the like. TBBS and CBS are preferred among these.

[0184] Examples of thiazole-based vulcanization accelerators include, for example, 2-mercaptobenzothiazole (MBT) or a salt thereof, di-2-benzothiazolyl disulfide (MBTS), 2-(2,4-dinitrophenyl)mercaptobenzothiazole, 2-(2,6-diethyl-4-morpholinothio)benzothiazole, and the like. Among these, MBTS and MBT are preferred, and MBTS is further preferred.

[0185] Examples of guanidine-based vulcanization accelerators include, for example, 1,3-diphenylguanidine (DPG), 1,3-di-o-tolylguanidine, 1-o-tolylbiguanide, di-o-tolylguanidine salt of dicatechol borate, 1,3-di-o-cumenylguanidine, 1,3-di-o-biphenylguanidine, 1,3-di-o-cumenyl-2-propionylguanidine, and the like. DPG is the preferred compound.

[0186] The content of a vulcanization accelerator, when combined, based on 100 parts by mass of the rubber component, is preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and even more preferably 1.5 parts by mass or more. Furthermore, the content of the vulcanization accelerator, based on 100 parts by mass of the rubber component, is preferably 8.0 parts by mass or less, more preferably 6.0 parts by mass or less, and even more preferably 4.0 parts by mass or less. When the content of the vulcanization accelerator is within the ranges described above, fracture toughness and elongation tend to be ensured. [Production of rubber compound and tires]

[0187] The rubber composition according to the present embodiment can be produced by a known method. It can be produced, for example, by kneading each of the components described above using a rubber kneading device, such as an open roller, a closed-type kneader (Bunbury mixer, kneader, etc.), and the like.

[0188] The kneading step includes, for example, a basic kneading step involving the kneading of bonding agents and additives other than vulcanizing agents and vulcanization accelerators, and a final kneading step (F-kneading) involving the addition of vulcanizing agents and vulcanization accelerators to the kneaded product obtained by the basic kneading step, and the kneading of this product. Furthermore, the basic kneading step can be subdivided into several steps if desired.

[0189] A kneading condition is not particularly restricted. Examples of kneading include, for instance, a process of kneading at a discharge temperature of 150 to 170 °C for 3 to 10 minutes for the initial kneading step, and a process of kneading at 70 to 110 °C for 1 to 5 minutes for the final kneading step. A vulcanization condition is not particularly restricted. Examples of vulcanization include, for instance, a process of vulcanizing at 150 to 200 °C for 10 to 30 minutes.

[0190] The tire, comprising the tread section formed from the rubber composition described above, can be produced by a conventional process. That is, the tire can be produced by extruding an unvulcanized rubber composition, in which each of the components described above is incorporated into the rubber component as required, into a mold for the first layer of a tread section. This is then joined with an inner rubber layer of the tread section and other tire elements on a tire forming machine, and subsequently formed by a conventional process to create an unvulcanized tire. This unvulcanized tire is then heated and pressurized in a vulcanizing machine. Vulcanization conditions are not particularly restricted. Examples of vulcanization include, for instance, a process of vulcanizing at 150 to 200 °C for 10 to 30 minutes. [Application of tires]

[0191] The tire according to the present embodiment can be used as a tire for a passenger car, a tire for a truck / bus, a motorcycle tire, or a racing tire. It is preferably used as a tire for a passenger car. Furthermore, a tire suitable for a passenger car is one that is mounted on a four-wheeled vehicle and has a maximum load capacity of 1000 kg or less. EXAMPLES

[0192] Examples considered preferred for implementation (examples) are shown below, but the scope of protection of the present invention is not limited to examples. Considering a tire having a first layer of a tread section obtained according to the compound in Tables 1 and 2 using various chemicals shown below, results calculated on the basis of the following evaluation methods are shown in Tables 1 and 2.

[0193] Various chemicals used in examples and comparisons are shown collectively below. NR: TSR20 SBR1: EUROPRENE (registered trademark) SOL R C2525, manufactured by Versalis SpA (styrene content: 26 wt%, vinyl content: 24 mol%, Mw: 600,000 mol%, non-oil-diluted product) SBR2: T3830, manufactured by Asahi Kasei Corporation (styrene content: 33 wt%, vinyl content: 34 mol%, Mw: 950,000, non-oil-diluted product) SBR3: Hydrogenated SBR, produced according to production example 1, which is mentioned later, (hydrogenation rate: 80 mol%, styrene content: 30 wt%, Mw: 480,000) BR: CB24, manufactured by LANXESS (BR, synthesized using an Nd-based catalyst, cis content: 96 mol%, Mw: 500,000) Soot: Show Black N220, manufactured by Cabot Japan KK (N2SA: 111 m 2 / G) Silicon dioxide 1: Ultrasil (Registered Trademark) VN3, manufactured by Evonik Industries AG (N2SA: 175 m 2 / g, average primary particle size: 17 nm) Silicon dioxide 2: Ultrasil (registered trademark) 9100GR, manufactured by Evonik Industries AG (N2SA: 230 m 2 / g, average primary particle size: 15 nm) Silane coupling agent 1: Si266, manufactured by Evonik Industries AG (Bis(3-triethoxysilylpropyl)disulfide) Silane coupling agent 2: NXT-Z45, manufactured by Momentive Performance Materials (mercapto group-based silane coupling agent, a copolymer of a bonding unit A and a bonding unit B, (bonding unit A: 55 mol%, bonding unit B: 45 mol%) Oil 1: VivaTec 500, manufactured by H&R Group (TDAE oil) Oil 2: Sunflower oil, produced by The Nisshin OilliO Group, Ltd. (Oleic acid content: 55% by mass, total polyunsaturated fatty acid content: 8% by mass) Resin component: Oppera PR395, manufactured by Exxon Mobil Corporation (hydrogenated DCPD / C9 resin, softening point: 118 °C) Wax: OZOACE 0355 (paraffin wax), manufactured by Nippon Seiro Co., Ltd. Antioxidant: Nocrac 6C, manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine) Zinc oxide: Zinc oxide No. 1, manufactured by Mitsui Mining & Smelting Co., Ltd. Stearic acid: Stearic acid “CAMELLIA”, manufactured by NOF CORPORATION Sulfur: HK-200-5, manufactured by Hosoi Chemical Industry Co., Ltd. (5% oil-based sulfur powder) Vulcanization accelerator: Nocceler CZ, manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (N-Cyclohexyl-2-benzothiazolylsulfenamide (CBS)) (Production example 1: Production of hydrogenated SBR)

[0194] To a heat-resistant reaction vessel that has undergone sufficient nitrogen purging, 2000 ml of n-hexane, 60 g of styrene, 140 g of 1,3-butadiene, 0.93 g of TMEDA, and 0.45 mmol of n-butyllithium are added, and the mixture is stirred at 50 °C for 5 hours to initiate a polymerization reaction. Next, the mixture is stirred for 20 minutes while hydrogen gas is supplied at a pressure of 0.4 MPaG and reacts with unreacted polymer end-lithium to form lithium hydride. Hydrogenation is carried out using a catalyst composed mainly of titanocene dichloride, with a hydrogen gas supply pressure of 0.7 MPaG and a titanocene dichloride reaction temperature of 90 °C.When hydrogen absorption reaches an integrated amount of an intended hydrogenation rate, the reaction temperature is set to a standard temperature, and the hydrogen pressure is reset to normal pressure to extract the hydrogen gas from the reaction vessel, and the reaction solution is loaded into water and stirred to remove the solvent by steam stripping, thus obtaining a hydrogenated SBR. (Examples and comparisons)

[0195] According to the compound formulations shown in Tables 1 and 2, using a closed 1.7-liter Banbury mixer, all chemicals other than sulfur and vulcanization accelerator are kneaded for 1 to 10 minutes until a discharge temperature of 150 to 160 °C is reached to obtain a kneaded product. Next, using an open twin-screw mixer, sulfur and vulcanization accelerator are added to the kneaded product, and the mixture is kneaded for 4 minutes until the temperature reaches 105 °C to obtain an unvulcanized rubber composition.The unvulcanized rubber composition is used to extrude a first layer of tread section (thickness: 5.0 mm) into a mold using an extruder equipped with a die of a predetermined shape, and joined with a second layer of tread section (thickness: 2.0 mm) and other tire elements to produce an unvulcanized tire. The unvulcanized tire is then press-vulcanized under a temperature of 170 °C for 12 minutes to obtain each test tire (size: 215 / 55R18) as described in Tables 1 and 2. <Messung von 30 °C-tanδ und 30 °C-E*>

[0196] For each vulcanized rubber test piece produced by cutting out a 20 mm long × 4 mm wide × 1 mm thick section from the inside of a first layer of a tread section of each test tire, such that one tire circumferential direction becomes a long side and one tire radial direction becomes a thickness direction, a loss tangent tanδ and a complex modulus of elasticity E* are measured using a dynamic viscoelasticity measuring device (EPLEXOR series, manufactured by gabo Systemtechnik GmbH) under a temperature of 30 °C, a frequency of 10 Hz, an initial strain of 5%, a dynamic strain of ±1%, and a strain mode. <Zugprüfung>

[0197] For a test piece No. 7 in the form of a dumbbell with a thickness of 1 mm, which is cut from the inside of a first layer of a tread section of each test tire such that one tire circumferential direction becomes a tensile direction and one tire radial direction becomes a thickness direction, a tensile test is carried out in accordance with JIS K 6251:2017 under a tensile speed of 3.3 mm / sec in an atmosphere of 23 °C to determine a modulus (MPa) at elongation (M 200 ) to measure 200%. <brennstoffeffizienz>

[0198] Using a rolling resistance tester, the rolling resistance of each test tire is measured and expressed as an index when it is subjected to an internal pressure of 230 kPa, a load of 3.43 kN, and a speed of 80 km / h. For comparison, 2 is 100. The results show that the higher the index, the lower the rolling resistance and the better the fuel efficiency. <abriebfestigkeit>

[0199] Each test tire is mounted on a domestic FF vehicle, and the groove depth of a tread section is measured after driving 8000 km to calculate the distance the tire will travel when its groove depth is reduced by 1 mm. Wear resistance is indicated as an index, with 2 being the comparative example of 100. The results show that the higher the index, the better the wear resistance. <gesamtleistung>

[0200] The sum of the fuel efficiency index and the abrasion resistance index is shown as an overall performance index. Table 1 Example 1 2 3 4 5 6 7 8 9 10 11 12 Composite quantity (mass parts) NR 10 10 10 10 10 10 10 10 10 60 10 10 SBR1 80 80 80 80 80 80 80 80 80 - - 80 SBR2 - - - - - - - - - 20 - - SBR3 - - - - - - - - - - 80 - BR 10 10 10 10 10 10 10 10 10 20 10 10 soot 5 5 5 5 5 5 5 5 5 30 5 5 Silicon dioxide 1 85 85 85 85 75 85 75 - 80 35 85 85 Silicon dioxide 2 - - - - - - - 75 - - - - Silane coupling agent 1 6, 8 6, 8 6, 8 6, 8 6, 0 6, 8 6, 0 - - 2,8 6, 8 6, 8 Silane coupling agent 2 - - - - - - - 7, 5 8,0 - - - Öl 1 10 10 10 10 10 20 20 20 20 10 10 10 Öl 2 - - 10 5 - - - - - - - Resin component 10 10 20 5 10 20 20 20 20 10 10 10 wax 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 Antioxidants 3,0 3,0 3,0 3,0 3,0 3,0 3,0 3,0 3,0 3,0 3,0 3,0 zinc oxide 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 Stearic acid 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 sulfur 1,5 1,5 1,5 1,5 1,5 1,5 1,5 1,5 1,5 1,5 1,5 1,5 Vulcanization accelerator 3, 5 3, 5 3,5 3,5 3,5 3,5 3,5 3,5 3,5 3,5 3,5 3,5 First shift Total content of phosphorus in plasticizers (bulk parts) 20 20 40 20 20 40 40 40 40 20 20 20 Total styrene quantity S (mass %) 20,8 20,8 20,8 20,8 20,8 20,8 20,8 20,8 20,8 6, 6 24,0 20,8 30 °C-tanδ 0,20 0,20 0,20 0,20 0,15 0,20 0,15 0,15 0,15 0,20 0,18 0,20 30 °CE* (MPa) 9, 0 9, 0 7, 0 10,0 6,5 5,5 4,5 4, 8 5,0 9, 0 7,5 7,5 M 200 (MPa) 10,0 10,0 9,5 12,0 8,5 7,5 7, 0 7,2 7, 4 13,0 9, 0 9, 0 Tires Tire weight G (kg) 8, 4 8,0 8, 4 8, 4 8, 4 8,0 8,0 8,0 8,0 8,0 8,0 8,0 Maximum load capacity W L (kg) 606 606 606 606 606 606 606 606 606 606 606 606 G / W L 0,013 0,013 0,013 0,013 0,013 0,013 0,013 0,013 0,013 0,013 0,013 0,013 9 2 9 9 9 2 2 2 2 2 2 2 Survey ratio R 0, 65 0, 65 0, 65 0, 65 0, 65 0, 65 0, 65 0, 65 0, 65 0, 65 0, 65 0, 60 R × P 13,0 13,0 26, 0 13,0 13,0 26, 0 26, 0 26, 0 26, 0 13,0 13,0 12,0 (R × P) / (G / W L ) 938 985 1876 938 938 1970 1970 1970 1970 985 985 909 30 °C-tanδ / R 0,31 0,31 0,31 0,31 0,23 0,31 0,23 0,23 0,23 0,23 0,28 0,33 S / R 32 32 32 32 32 32 32 32 32 10 37 35 (Continued on the next page) M 200 × 30 °C-E* / 30 °C-tanδ 450 450 333 600 368 206 210 230 247 585 375 338 Evaluation Fuel efficiency 115 117 114 113 118 112 117 116 117 110 109 107 Abrasion resistance 108 111 113 110 109 108 107 105 103 106 104 103 Total performance 223 228 227 223 227 220 224 221 220 216 213 210 Table 2 Comparative example 1 2 3 4 5 6 7 Composite quantity (mass parts) NR 10 10 10 10 10 10 10 SBR1 80 80 80 80 80 80 80 SBR2 - - - - - - - SBR3 - - - - - - - BR 10 10 10 10 10 10 10 soot 5 5 5 5 5 5 5 Silicon dioxide 1 85 85 85 85 85 85 85 Silicon dioxide 2 - - - - - - - Silane coupling agent 1 6, 8 6, 8 6, 8 6, 8 6, 8 6, 8 6, 8 Silane coupling agent 2 - - - - - - - Öl 1 15 15 10 20 50 10 10 Öl 2 - - - - - - - Resin component - - 5 - - 5 10 wax 2,0 2,0 2,0 2,0 2,0 2,0 2,0 Antioxidants 3,0 3,0 3,0 3,0 3,0 3,0 3,0 zinc oxide 2,0 2,0 2,0 2,0 2,0 2,0 2,0 Stearic acid 2,0 2,0 2,0 2,0 2,0 2,0 2,0 sulfur 1,5 1,5 1,5 1,5 1,5 1,5 1,5 Vulcanization accelerator 3, 5 3, 5 3,5 3,5 3,5 3,5 3,5 First shift Total content of plasticizer phosphorus (bulk fractions) 15 15 15 20 50 15 20 Total styrene amount S (mass %) 20,8 20,8 20,8 20,8 20,8 20,8 20,8 30 °C-tanδ 0,22 0,22 0,22 0,22 0,22 0,22 0,20 30 °CE* (MPa) 9, 0 9, 0 9, 0 8,0 4,0 10,0 8,0 M 200 (MPa) 8, 8 8, 7 8, 9 9, 0 6, 0 10,0 9, 0 Tires Tire weight G (kg) 8,8 8, 4 8,8 8,8 8,8 8, 4 8,8 Maximum load capacity W L (kg) 606 606 606 606 606 606 606 G / W L 0,0145 0,0139 0,0145 0,0145 0,0145 0,0139 0,0145 Survey ratio R 0, 65 0, 65 0, 65 0, 60 0, 60 0, 65 0, 65 R × P 9, 8 9, 8 9, 8 12,0 30,0 9, 8 13,0 (R × P) / (G / W L ) 671 703 671 826 2066 703 895 30 °C-tanδ / R 0,34 0,34 0,34 0,37 0,37 0,34 0,31 S / R 32 32 32 35 35 32 32 M 200 × 30 °C-E* / 30 °C-tanδ 360 356 364 327 109 455 360 Evaluation Fuel efficiency 94 100 95 98 97 99 97 Abrasion resistance 98 100 99 97 96 97 98 Total performance 192 200 194 195 193 196 195 <Ausführungsformen>

[0201] Examples of embodiments of the present invention are shown below. [1] A tire which is an embodiment of the present invention is a tire comprising a tread section with at least one rubber layer, wherein a ratio (G / W) L ) of a tire weight G in kg to a maximum load capacity W L in kg of the tire is 0.0140 or less, wherein a first layer forming a tread surface is composed of a rubber composition comprising a rubber component, a plasticizer and a filler, wherein the plasticizer comprises at least one selected from the group consisting of a hydrogenated resin component and a vegetable oil, and wherein, in a case where R represents a loft ratio on a ground contact area of ​​the tread section and P represents a total plasticizer content based on 100 parts by mass of the rubber component in the rubber composition, a product of R and P (R × P) is greater than 10.0, preferably 11.0 or greater, more preferably 12.0 or greater and less than 35.0. [2] The tire from [1] above, where G / W L 0.0135 or less. [3] The tire from one of [1] to [2] above, wherein a tanδ at 30 °C (30 °C tanδ) of the rubber composition is 0.15 or less. [4] The tire of [3] above, wherein 30 °C-tanδ / R is less than 0.60, preferably less than 0.50, further preferably greater than 0.10 and less than 0.45. [5] The tire of one of [1] to [4] above, where (R × P) / (G / W L ) greater than 1,000 and less than 2,000. [6] The tire according to any one of claims [1] to [5] above, wherein the total amount of styrene S in the rubber component is 25% by mass or less. [7] The tire of [6] above, wherein S / R is less than 45, preferably greater than 3 and less than 40. [8] The tire from [1] to [7] above, wherein the rubber composition comprises silicon dioxide having an average primary particle size of 16 nm or less. [9] The tire of one of [1] to [8] above, wherein the rubber composition comprises a mercapto-based silane coupling agent.

[10] The tire from one of [1] to [9] above, wherein in a case where M 200 in MPa represents a modulus at elongation of 200% of the rubber composition and 30 °CE* in MPa represents a complex elastic modulus at 30 °C of the rubber composition, M 200 , 30 °CE* and 30 °C-tanδ of the rubber composition satisfy the following inequality: M200×30 °C−E* / 30 °C-tanδ≥200.

[11] The tire from one of [1] to

[10] above, wherein the rubber component comprises a hydrogenated styrene-butadiene rubber.< / gesamtleistung> < / abriebfestigkeit> < / brennstoffeffizienz> < / weichmacher> < / kautschukkomponente> < / messverfahren> < / definitionen>

Claims

[1] Tire comprising a tread section, wherein the tread section has at least one layer of rubber, where a ratio (G / W) L ) of a tire weight G in kg to a maximum load capacity W L in kg of the tire is 0.0140 or less, wherein a first layer, which forms a tread surface, is composed of a rubber composition comprising a rubber component, a plasticizer and a filler, wherein the plasticizer comprises at least one selected from the group consisting of a hydrogenated resin component and a vegetable oil, and where in a case where R represents a loft ratio on a ground contact area of ​​the tread section and P represents a total plasticizer content based on 100 parts by mass of the rubber component in the rubber composition, a product of R and P (R × P) is greater than 10.

0. [2] Tires according to claim 1, wherein G / W L 0.0135 or less. [3] Tires according to claim 1 or 2, wherein the tanδ at 30 °C (30 °C tanδ) of the rubber composition is 0.15 or less. [4] Tires according to claim 3, wherein 30 °C-tanδ / R is less than 0.

60. [5] Tires according to any one of claims 1 to 4, wherein (R × P) / (G / W L ) greater than 1,000 and less than 2,000. [6] Tires according to any one of claims 1 to 5, wherein the total amount of styrene S in the rubber component is 25% by mass or less. [7] Tires according to claim 6, wherein S / R is less than 45. [8] Tires according to any one of claims 1 to 7, wherein the rubber composition comprises silicon dioxide having an average primary particle size of 16 nm or less. [9] Tires according to any one of claims 1 to 8, wherein the rubber composition comprises a mercapto-based silane coupling agent. [10] Tires according to any one of claims 1 to 9, wherein in a case where M 200 in MPa represents a modulus at elongation of 200% of the rubber composition and 30 °CE* in MPa represents a complex elastic modulus at 30 °C of the rubber composition, M 200 , 30 °CE* and 30 °C-tanδ of the rubber composition satisfy the following inequality: M200×30 °C−E* / 30 °C-tanδ≥200. [11] Tires according to any one of claims 1 to 10, wherein the rubber component comprises a hydrogenated styrene-butadiene rubber.

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