tire

Abstract

To provide a tire of which durability is enhanced while taking into account the environmental burden using recycled carbon black.SOLUTION: In a tire which is provided with a tire member composed of a rubber composition, the rubber composition contains a rubber constituent and a carbon black and average primary particle diameter of the carbon black is 50.0nm or less and the carbon black contains a recycled carbon black. Content (mass part) for 100 mass part of the rubber constituent of the carbon black is dealt with as ACB. The average primary particle diameter (nm) of the carbon black is dealt with as DCB. The maximum thickness (nm) of the tire member is dealt with as T. The tire is configured so that ACB, DCB and T satisfy the following equation. (1) (ACB×DCB) / T<4500.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] The need to consider environmental impact is increasing year by year across all industries. In the case of tires, there are attempts to reuse used raw materials. One known form of carbon black is recycled carbon black, which is obtained by pyrolysis of used tires. It has been estimated that switching from regular carbon black to recycled carbon black would reduce carbon dioxide emissions from the carbon black manufacturing process by more than 80%. According to this estimate, replacing just 10% of regular carbon black with recycled carbon black would reduce annual global CO2 emissions by 2.7 million tons.

[0003] Patent Document 1 discloses that carbon black, a high-end material, is obtained by pyrolysis of used tires, and the surface of the recycled carbon black is supplemented with hydroxyl groups and carboxyl groups, and then the carbon black is used as part of regular carbon black. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] European Patent Application Publication No. 3173251 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a tire that uses recycled carbon black and has improved durability while taking into consideration the environmental impact. [Means for solving the problem]

[0006] The present invention relates to the following tire. A tire having a tire component made of a rubber composition, The rubber composition includes a rubber component and carbon black, The carbon black has an average primary particle diameter of 50.0 nm or less, The carbon black comprises recycled carbon black, The content (parts by mass) of the carbon black relative to 100 parts by mass of the rubber component is A CB The average primary particle diameter (nm) of the carbon black is defined as D CB When the maximum thickness (mm) of the tire component is T, A CB , D CB and a tire where T satisfies the following formula: (1) (A CB ×D CB ) / T<4500 [Effects of the Invention]

[0007] According to the present invention, a tire having improved durability can be provided by using recycled carbon black while taking into consideration the environmental impact. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing a part of a cross section (upper right part of the cross section) taken along a plane including the tire rotation axis, of a tire according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] The tire of the present embodiment is a tire including a tire member made of a rubber composition, the rubber composition including a rubber component and carbon black, the carbon black having an average primary particle diameter of 50.0 nm or less, the carbon black including recycled carbon black, and a content (parts by mass) of the carbon black relative to 100 parts by mass of the rubber component of A CB The average primary particle diameter (nm) of the carbon black is defined as D CB When the maximum thickness (mm) of the tire component is T, A CB, D CB and T is a tire that satisfies the following formula. (1) (A CB ×D CB ) / T<4500

[0010] While not intending to be bound by theory, the following mechanism is believed to be responsible for improving tire durability while considering the environmental impact of using recycled carbon black in the tire of this embodiment. Specifically, (1) recycled carbon black obtained by the thermal decomposition of used tires has lower surface reactivity than regular carbon black, resulting in a reduced physical bonding strength in the rubber composition. However, reducing the particle size of the carbon black containing recycled carbon black and increasing its specific surface area is believed to improve the physical bonding strength with the polymer, contributing to improved reinforcing strength. Furthermore, (2) from the perspective of reinforcement, reducing the particle size of the carbon black containing recycled carbon black makes it possible to reduce the amount of carbon black used, while increasing the thickness of the component can further improve reinforcement. Therefore, keeping the product of the amount of carbon black used and the particle size divided by the maximum thickness of the tire component below a certain value is believed to contribute to maintaining and improving reinforcing strength. Furthermore, it is believed that the above (1) and (2) working together result in the extremely excellent effect of improving tire durability while considering the environmental impact of using recycled carbon black.

[0011] The right side of the formula (1) is preferably 3,000.

[0012] It is believed that the effects of the invention are more likely to be achieved by satisfying stricter conditions in formula (1).

[0013] The above A CB is preferably 20 or more and 100 or less.

[0014] The above D CB is preferably 47.0 nm or less.

[0015] It is believed that by reducing the particle size of carbon black and increasing its specific surface area, the physical bonding strength with the polymer improves, contributing to improved reinforcing strength.

[0016] The tire component is preferably an inner liner.

[0017] The tire component is preferably an insulation.

[0018] <Definition> "Normal condition" refers to a condition in which the tire is mounted on a normal rim and filled with air at normal internal pressure, with no load applied.

[0019] Unless otherwise specified, the "dimensions of each part of the tire" are values ​​that are specified when the tire appears on its outer surface in a normal state, while those that exist inside the tire or on a cut surface of the tire are values ​​that are specified when, for example, the tire is cut along a plane that includes the tire rotation axis and the cut tire piece is maintained within the rim width of a normal rim.

[0020] "Genuine rim" refers to the rim specified for each tire in the standard system that includes the standard on which the tire is based. For example, for JATMA (Japan Automobile Tire Manufacturers Association), it refers to the standard rim for the applicable size listed in the "JATMA YEAR BOOK," for ETRTO (The European Tyre and Rim Technical Organization), it refers to the "Measuring Rim" listed in the "STANDARDS MANUAL," and for TRA (The Tire and Rim Association, Inc.), it refers to the "Design Rim" listed in the "YEAR BOOK." JATMA, ETRTO, and TRA are referenced in that order, and if an applicable size is available at the time of reference, that standard is followed. In the case of a tire not specified in the above standards, it refers to the narrowest rim among the smallest diameter rims that can be mounted on the tire and can maintain internal pressure (i.e., no air leaks from between the rim and tire).

[0021] "Normal internal pressure" refers to the air pressure specified for each tire in the standard system that includes the standard on which the tire is based. For example, for JATMA, it is "maximum air pressure," for ETRTO, it is "INFLATION PRESSURE," and for TRA, it refers to the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES." As with regular rims, refer to JATMA, ETRTO, and TRA in that order, and follow that standard if there is an applicable size at the time of reference. In the case of tires not specified in the above standards, it refers to the normal internal pressure (250kPa or more) of another tire size (defined in the standard) that is specified using the regular rim as the standard rim, and if there are multiple normal internal pressures of 250kPa or more listed, it refers to the smallest value among them.

[0022] "Normal load" refers to the load specified for each tire in the standard system that includes the standard on which the tire is based. For example, for JATMA it is "Maximum Load Capacity", for ETRTO it is "Load Capacity", and for TRA it is the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES". As with normal rims and normal internal pressures, JATMA, ETRTO, and TRA should be referenced in that order, and if there is an applicable size at the time of reference, that standard should be followed. For tires not specified in the above standards, the maximum load capacity W calculated separately should be used. L is the normal load.

[0023] "Maximum load capacity W L " is calculated using the following formula: "V" is the virtual volume of the tire (mm 3), "Dt" is the outer diameter (mm) of the tire in its normal state, "Ht" is the tire's cross-sectional height (mm) in the tire's radial direction in a cross section of the tire taken along a plane including the tire's rotation axis, and "Wt" is the tire's cross-sectional width (mm) in its normal state. Ht can be calculated by (Dt-R) / 2, where R is the tire rim diameter. Wt is the value obtained by excluding any patterns or letters on the tire sidewall. Note that maximum load capacity is synonymous with the normal load mentioned above.

[0024]

number

[0025] "Recycled carbon black" refers to carbon black obtained from the thermal decomposition process of used tires and other products containing carbon black, and is carbon black in which, when subjected to oxidative combustion by heating in air using a thermogravimetric method in accordance with JIS K 6226-2:2003, the proportion of ash (the mass of the non-combustible component) is 13% by mass or more. In other words, the mass of the weight loss due to the oxidative combustion (carbon amount) is 87% by mass or less. Recycled carbon black is also called recycled carbon or recycled carbon black, and is sometimes expressed as rCB.

[0026] "Maximum thickness of tire component" is the maximum thickness (mm) of the tire component in question in a cross section of the tire taken along a plane including the tire rotation axis. The maximum thickness is measured by cutting the tire along a plane including the tire rotation axis to create a tire specimen, and maintaining the normal rim width between the beads of the tire specimen. The maximum thickness is the average value of the thicknesses measured at five points while rotating the tire 72 degrees each time.

[0027] When the thickness of a tire component is substantially uniform in the cross section of the tire, the thickness at a predetermined location is defined as the maximum thickness of the tire component. That is, (1) for components whose radial thickness can be recognized on the tire centerline, the maximum thickness is defined as the thickness, and (2) for tire components whose thickness cannot be recognized as defined in (1), the maximum thickness is defined as the thickness at the tire's maximum width position in the tire rotational axis direction. Examples of tire components in (1) include the tread, full band, belt, carcass, insulation, inner liner, etc., and examples of tire components in (2) include the sidewall, etc.

[0028] On the other hand, if the thickness of a tire component varies in the cross section of the tire, the maximum thickness is determined taking into account the usual thickness determination method for that tire component, such as a clinch or wing.

[0029] The "maximum thickness of the insulation" is the thickness in the radial direction of the tire on the tire centerline in a cross section of the tire taken along a plane including the tire rotation axis. This corresponds to T2 in Figure 1.

[0030] The "maximum thickness of the inner liner" is the thickness in the radial direction of the tire on the center line of the tire in a cross section of the tire taken along a plane including the tire rotation axis. This corresponds to T3 in Figure 1.

[0031] The "maximum thickness of the sidewall" is the thickness at the tire's widest point in the tire's axis direction in a cross section of the tire taken along a plane including the tire's axis of rotation. This corresponds to T4 in Figure 1.

[0032] The "maximum thickness of the clinch" is the thickness measured along a normal to the main body of the carcass that passes through the point where the sidewall and the clinch meet on the tire outer surface. In Figure 1, P1 is the point where the sidewall and the clinch meet on the tire outer surface, L1 is the normal to the main body of the carcass that passes through point P1, and T5 is the maximum thickness of the clinch measured along the normal L1.

[0033] The "maximum thickness of the wing" is the thickness measured along a normal to the tire outer surface that passes through the point where the contour line of the tread on the outer side in the tire width direction intersects with the contour line of the sidewall on the outer side in the tire radial direction. In Figure 1, P2 is the point where the contour line of the tread on the outer side in the tire width direction intersects with the contour line of the sidewall on the outer side in the tire radial direction, L2 is the normal to the tire outer surface that passes through point P2, and T6 is the maximum thickness of the wing measured along the normal line L2.

[0034] <Measurement method> The "styrene content" is calculated by pyrolysis gas chromatography.

[0035] The "vinyl content (amount of 1,2-bonded butadiene units)" is measured by infrared absorption spectroscopy.

[0036] The "cis content (amount of cis-1,4-bonded butadiene units)" is measured by infrared absorption spectroscopy.

[0037] The "ash content of recycled carbon black" is measured by the thermogravimetric method of JIS K 6226-2:2003.

[0038] The "average primary particle size of carbon black" is a value determined by photographing particles with a transmission or scanning electron microscope and arithmetically averaging the particle sizes of 400 particles. If the particle shape is spherical, the particle size is the diameter of the sphere; if the particle shape is non-spherical, the particle size is calculated from the microscope image as the circle-equivalent diameter (positive square root of {4 x (particle area) / π}). This applies to carbon black, including recycled carbon black.

[0039] The "nitrogen adsorption specific surface area (N2SA) of carbon black" is measured in accordance with JIS K 6217-2:2017.

[0040] The "nitrogen adsorption specific surface area (N2SA) of silica" is a value measured by the BET method in accordance with ASTM D3037-93.

[0041] The "weight average molecular weight (Mw)" can be determined by converting the measured value into standard polystyrene equivalents using gel permeation chromatography (GPC) (for example, a GPC-8000 series manufactured by Tosoh Corporation, a differential refractometer as the detector, and a TSKgel SuperMultipore HZ-M column manufactured by Tosoh Corporation). This applies to, for example, SBR, BR, plasticizers, etc.

[0042] The "softening point of the resin" is the temperature at which the ball drops when the softening point specified in JIS K 6220-1:2015 7.7 is measured using a ring and ball softening point tester.

[0043] <Tires> The tire according to the present embodiment will be described below with reference to the drawings as appropriate, although the drawings are merely examples for the purpose of explanation.

[0044] The tire according to the present embodiment is a tire including a tire member made of a predetermined rubber composition, and the content (parts by mass) of carbon black relative to 100 parts by mass of a rubber component contained in the rubber composition is A CB The average primary particle diameter (nm) of the carbon black is defined as D CB When the maximum thickness (mm) of the tire component is T, A CB , D CB and T is a tire that satisfies the following formula. (1) (A CB ×D CB ) / T<4500

[0045] Fig. 1 is a schematic diagram showing a portion of a cross section (upper right portion of the cross section) of a tire according to this embodiment, taken along a plane including the tire rotation axis. Fig. 1 shows an insulation 2, an inner liner 3, a sidewall 4, a clinch 5, and a wing 6 of the tire 1. The maximum thickness of the insulation 2 is indicated as T2, the maximum thickness of the inner liner 3 as T3, the maximum thickness of the sidewall 4 as T4, the maximum thickness of the clinch 5 as T5, and the maximum thickness of the wing 6 as T6.

[0046] (Formula (1)) In formula (1), the value of the right side is preferably 4000, more preferably 3800, even more preferably 3700, even more preferably 3500, even more preferably 3000, even more preferably 2800, and even more preferably 2600. On the other hand, the value of (A CB ×D CB The lower limit of the value of ) / T is not particularly limited from the viewpoint of the effects of the invention, but may be, for example, 500, 800, or 1000.

[0047] A CB is the total content of carbon black including recycled carbon black, and is, for example, preferably 20 parts by mass or more, more preferably more than 20 parts by mass, even more preferably more than 30 parts by mass, even more preferably more than 40 parts by mass, even more preferably more than 50 parts by mass, even more preferably more than 60 parts by mass, and even more preferably more than 70 parts by mass, per 100 parts by mass of the rubber component. On the other hand, the total content is preferably less than 150 parts by mass, more preferably less than 120 parts by mass, even more preferably 110 parts by mass or less, even more preferably 100 parts by mass or less, and even more preferably less than 100 parts by mass. When the carbon black content is within the above range, sufficient reinforcing properties and good dispersibility in rubber tend to be obtained.

[0048] D CB is the average primary particle size of carbon black, including recycled carbon black, and is 50.0 nm or less. If the average primary particle size exceeds 50.0 nm, sufficient durability cannot be obtained. The average primary particle size is preferably less than 50.0 nm, more preferably less than 48.0 nm, even more preferably less than 47.0 nm, even more preferably less than 46.0 nm, even more preferably less than 45.0 nm, even more preferably less than 40.0 nm, even more preferably less than 39.0 nm, even more preferably less than 38.0 nm, even more preferably less than 37.0 nm, even more preferably less than 36.0 nm, even more preferably less than 35.0 nm, and even more preferably less than 32.0 nm. On the other hand, there is no particular lower limit for the average primary particle size from the perspective of the effects of the present invention, but it is, for example, 20 nm or more. The average primary particle size of carbon black is measured by the above-mentioned measurement method.

[0049] T is the maximum thickness of the tire component, and from the viewpoint of durability, it is preferably 0.10 mm or more, more preferably 0.20 mm or more, even more preferably 0.30 mm or more, even more preferably 0.50 mm or more, even more preferably 0.70 mm or more, even more preferably 0.75 mm or more, even more preferably 0.80 mm or more, even more preferably 0.90 mm or more, and even more preferably 1.00 mm or more. On the other hand, there is no particular restriction on the upper limit of the maximum thickness, and it can be determined naturally for each tire component. For example, when the tire component is an inner liner, its maximum thickness is preferably 1.5 mm or less. Furthermore, when the tire component is insulation, its maximum thickness is preferably 1.5 mm or less.

[0050] Among the variables that make up the left side of equation (1), A CB is the content (parts by mass) of carbon black relative to 100 parts by mass of the rubber component contained in the rubber composition, and can be adjusted by increasing or decreasing the amount of carbon black compounded, particularly the total amount when multiple types of carbon black are compounded. CB Since A is the average primary particle diameter (nm) of the carbon black, it can be adjusted by selecting the average primary particle diameter of the carbon black to be blended. In particular, when blending multiple types of carbon black with different average primary particle diameters, it can also be adjusted by changing the blending ratio. Furthermore, T is the maximum thickness of the tire component, so it can be adjusted by increasing or decreasing the maximum thickness of the tire component. CB , D CB By adjusting and T, the left side of equation (1) (A CB ×D CB ) / T value can be adjusted.

[0051] <Rubber composition> Hereinafter, the rubber composition constituting the tire components will be described. In the present embodiment, examples of the tire components include a tread, a full band, a belt, a carcass, an insulation, an inner liner, a sidewall, a clinch, and a wing. Among these, the inner liner and the insulation are preferred as the tire components.

[0052] The rubber compositions constituting these tire components all contain a rubber component and carbon black, the carbon black having an average primary particle size of 50.0 nm or less, and the carbon black containing recycled carbon black.

[0053] The amount of recycled carbon black relative to 100% by mass of carbon black is not particularly limited, and the carbon black may contain at least recycled carbon black. This is because a high recycled carbon black content reduces the physical bonding strength of the carbon black in the rubber composition, but can contribute significantly to reducing CO2 emissions. Conversely, a low recycled carbon black content reduces the contribution to reducing CO2 emissions, but does not significantly reduce the physical bonding strength of the carbon black in the rubber composition. In either case, by satisfying the requirements of the present invention, recycled carbon black can be used to improve durability according to the respective circumstances while taking into consideration the environmental impact.

[0054] The content of recycled carbon black relative to 100% by mass of carbon black is, for example, preferably 1% by mass or more, more preferably 5% by mass or more, even more preferably 10% by mass or more, even more preferably 20% by mass or more, even more preferably 30% by mass or more, even more preferably 40% by mass or more, and even more preferably 50% by mass or more. The content may be 100% by mass.

[0055] [Rubber composition constituting the inner liner] The rubber composition constituting the inner liner will be described.

[0056] (rubber component) The rubber component preferably contains a butyl-based rubber. In this case, the rubber component may contain a rubber component other than the butyl-based rubber. Examples of rubber components other than the butyl-based rubber include diene-based rubbers and non-diene-based rubbers. Examples of diene-based rubbers that can be used include isoprene-based rubbers (IR rubbers), styrene-butadiene rubbers (SBRs), and butadiene rubbers (BRs), as described below. In addition, styrene-isoprene-butadiene rubbers (SIBRs), chloroprene rubbers (CRs), and acrylonitrile-butadiene rubbers (NBRs), etc., can also be used. Examples of non-diene-based rubbers that can be used include ethylene-propylene rubbers, polynorbornene rubbers, silicone rubbers, chlorinated polyethylene rubbers, fluororubbers (FKMs), acrylic rubbers (ACMs), and hydrin rubbers. Rubber components synthesized from recycled or biomass-derived raw materials, as described below, can also be used. The butyl-based rubbers, rubber components other than the butyl-based rubbers, diene-based rubbers, and non-diene rubbers can each be used alone or in combination of two or more.

[0057] <Butyl rubber> Preferred butyl rubbers are polymers containing isobutylene units and isoprene units as repeating units, and derivatives thereof. Examples of such butyl rubbers include butyl rubber (IIR); halogenated butyl rubbers such as brominated butyl rubber (Br-IIR) and chlorinated butyl rubber (Cl-IIR). Among these, halogenated butyl rubbers are preferred, and brominated butyl rubber and chlorinated butyl rubber are more preferred, as they can improve sheet processability and air barrier properties in a balanced manner. One or more types of butyl rubbers can be used.

[0058] As for butyl rubber, in addition to regular butyl rubber (butyl rubber other than recycled butyl rubber), recycled butyl rubber can be used in combination. Recycled butyl rubber usually has a high content of non-halogenated butyl rubber (regular butyl rubber), so by using it in combination with halogenated butyl rubber, good air barrier properties and vulcanization speed can be ensured. Recycled butyl rubber can be used alone or in combination of two or more types.

[0059] As the butyl-based rubber, for example, products of ExxonMobil Corporation, ENEOS Materials Corporation, Arlanxeo, JSR Corporation, Japan Butyl Co., Ltd., etc. can be used.

[0060] From the viewpoint of sufficient air barrier properties, the content of the butyl rubber in 100% by mass of the rubber component is preferably more than 70% by mass, more preferably more than 75% by mass, even more preferably 80% by mass or more, and particularly preferably 90% by mass or more. The content of the butyl rubber may be 100% by mass.

[0061] (filler) The filler includes carbon black. The carbon black includes recycled carbon black (rCB). The filler may also include fillers other than carbon black. Examples of such fillers include silica, aluminum hydroxide, calcium carbonate, alumina, clay, and talc, which have been commonly used in the tire industry. The filler may contain carbon black and silica, may consist of only carbon black and silica, or may consist of only carbon black.

[0062] <Recycled carbon black> As used herein, "recycled carbon black" refers to carbon black obtained by crushing used tires or other products containing carbon black and calcining the crushed material, and refers to carbon black in which, when subjected to oxidative combustion by heating in air as measured by thermogravimetry in accordance with JIS K 6226-2:2003, the proportion of the mass of ash (ash content), which is the non-combustible component, is 13% by mass or more. In other words, the proportion of the mass (carbon content) of the recycled carbon black lost due to oxidative combustion is 87% by mass or less. Recycled carbon black is sometimes expressed as rCB.

[0063] Recycled carbon black can be obtained from the pyrolysis process of used pneumatic tires. For example, European Patent Application Publication No. 3427975, citing "Rubber Chemistry and Technology," Vol. 85, No. 3, pp. 408-449 (2012), particularly pp. 438, 440, and 442, describes the carbon black as being obtained by pyrolysis of organic materials at 550-800°C in the absence of oxygen, or by vacuum pyrolysis at relatively low temperatures (

[0027] ). Carbon black obtained from such pyrolysis processes typically lacks functional groups on its surface, as mentioned in

[0004] of Japanese Patent Publication No. 6856781 (Comparison of the Surface Morphology and Chemistry of Pyrolytic Carbon Black and Commercial Carbon Black, Powder Technology 160 (2005) pp. 190-193). Therefore, recycled carbon black is thought to have low surface reactivity and therefore reduced physical binding strength in rubber compositions.

[0064] Recycled carbon black may lack functional groups on its surface, or may be treated to include functional groups on its surface. The treatment to include functional groups on the surface of recycled carbon black can be carried out by conventional methods. For example, in European Patent Application Publication No. 3,173,251, carbon black obtained by a pyrolysis process is treated with potassium permanganate under acidic conditions to obtain carbon black containing hydroxyl and / or carboxyl groups on its surface. Furthermore, in Japanese Patent Publication No. 6,856,781, carbon black obtained by a pyrolysis process is treated with an amino acid compound containing at least one thiol or disulfide group to obtain surface-activated carbon black. The recycled carbon black according to this embodiment also includes carbon black treated to include functional groups on its surface. Recycled carbon blacks may be used alone or in combination.

[0065] <Carbon black other than recycled carbon black> Carbon black other than recycled carbon black is not particularly limited, and examples include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, and N762. From the perspective of life cycle assessment, the raw material for carbon black may be a biomass material such as lignin or vegetable oil. Furthermore, carbon black may be produced by combustion, such as in a furnace, by hydrothermal carbonization (HTC), or by thermal decomposition of methane, such as in a thermal black process. Commercially available carbon blacks include those from Asahi Carbon Co., Ltd., Cabot Japan Co., Ltd., Tokai Carbon Co., Ltd., Mitsubishi Chemical Corporation, Lion Corporation, Nippon Steel Carbon Co., Ltd., and Columbia Carbon Co., Ltd. Carbon black may be used alone or in combination.

[0066] The average primary particle diameter (D CB ), and the total carbon black content including recycled carbon black (ACB ) is as explained above.

[0067] The nitrogen adsorption specific surface area (N2SA) of carbon black, including recycled carbon black, is not particularly limited, but from the viewpoint of obtaining sufficient reinforcement and good abrasion resistance, it is 30 m 2 / g or more is preferable, and 40m 2 / g is more preferable, and 50m 2 / g or more is more preferable, and 60m 2 / g or more is more preferable, and 70m 2 The upper limit of the N2SA is preferably 300 m / g from the viewpoint of excellent dispersibility and low heat generation. 2 The N2SA of the recycled carbon black in this specification is the value measured by the above method.

[0068] <Silica> The silica is not particularly limited, and can be, for example, silica prepared by a dry method (anhydrous silica), silica prepared by a wet method (hydrated silica), or other silica commonly used in the tire industry. The raw material for silica is not particularly limited, and can be, for example, a mineral-derived raw material such as quartz, a biological raw material such as rice husk (for example, silica made from biomass materials such as rice husk), or silica recycled from a silica-containing product. Among these, hydrated silica prepared by a wet method is preferred because it contains a large number of silanol groups. Silica can be used alone or in combination of two or more types.

[0069] Silica made from biomass materials can be obtained, for example, by extracting silicate from rice husk ash obtained by burning rice husks using a sodium hydroxide solution, and then reacting the silicate with sulfuric acid in the same manner as conventional wet-process silica to produce a silicon dioxide precipitate, which is then filtered, washed with water, dried, and pulverized.

[0070] Silica recycled from silica-containing products can be, for example, silica recovered from products containing silica, such as electronic components such as semiconductors, tires, desiccants, and filtering materials such as diatomaceous earth. The recovery method is not particularly limited, and examples include thermal decomposition and decomposition by electromagnetic waves. Among these, silica recovered from electronic components such as semiconductors or tires is preferred.

[0071] When silica crystallizes, it becomes insoluble in water, and its component, silicic acid, cannot be utilized. By controlling the combustion temperature and duration, it is possible to suppress the crystallization of silica in rice husk ash (see, for example, JP 2009-2594 A and Akita Prefectural University Web Journal B / 2019, vol. 6, pp. 216-222).

[0072] Amorphous silica extracted from rice husks may be commercially available from Wilmar Co., Ltd., etc.

[0073] The nitrogen adsorption specific surface area (N2SA) of the silica is preferably 50 m 2 / g, more preferably 100m 2 / g, more preferably 150m 2 / g, more preferably 170m 2 The upper limit of the N2SA of silica is not particularly limited, but is preferably 350 m 2 / g, more preferably less than 250m 2 / g, more preferably less than 200m 2 / g. By setting it within the above range, cut resistance tends to be improved. The N2SA of silica is a value measured by the above method.

[0074] When silica is contained, the content per 100 parts by mass of the rubber component is not particularly limited, but from the viewpoint of ensuring fuel economy and ride comfort, it is preferably more than 1 part by mass, more preferably more than 5 parts by mass, more preferably more than 10 parts by mass, and even more preferably more than 20 parts by mass. Also, from the viewpoint of dispersibility and processability of the silica, the content is preferably less than 150 parts by mass, more preferably less than 100 parts by mass, even more preferably less than 50 parts by mass, and even more preferably less than 30 parts by mass.

[0075] <Silane coupling agents> When silica is used, it is preferable to further contain a silane coupling agent. The silane coupling agent is not particularly limited, and examples thereof include bis(3-triethoxysilylpropyl)tetrasulfide, bis(2-triethoxysilylethyl)tetrasulfide, bis(4-triethoxysilylbutyl)tetrasulfide, bis(3-trimethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, bis(2-triethoxysilylethyl)trisulfide, bis(4-trimethoxysilylbutyl)trisulfide, bis(3-triethoxysilylpropyl)disulfide, bis(2-triethoxysilylethyl)disulfide, bis(4-triethoxysilylbutyl)disulfide, bis(3-trimethoxysilylpropyl)disulfide, bis(2-trimethoxysilylethyl)disulfide, bis(4-trimethoxysilylbutyl)disulfide, 3-trimethoxysilylpropyl-N,N-dimethylthiocalcium nitrate, Examples include sulfide-based compounds such as bamoyl tetrasulfide, 2-triethoxysilylethyl-N,N-dimethylthiocarbamoyl tetrasulfide, and 3-triethoxysilylpropyl methacrylate monosulfide; mercapto-based compounds such as 3-mercaptopropyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, and NXT and NXT-Z manufactured by Momentive; vinyl-based compounds such as vinyltriethoxysilane and vinyltrimethoxysilane; amino-based compounds such as 3-aminopropyltriethoxysilane and 3-aminopropyltrimethoxysilane; glycidoxy-based compounds such as γ-glycidoxypropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane; nitro-based compounds such as 3-nitropropyltrimethoxysilane and 3-nitropropyltriethoxysilane; and chloro-based compounds such as 3-chloropropyltrimethoxysilane and 3-chloropropyltriethoxysilane. Commercially available products that can be used include those manufactured by Evonik Degussa, Momentive, Shin-Etsu Silicones Co., Ltd., Tokyo Chemical Industry Co., Ltd., AZMAX Corporation, and Dow Corning Toray Co., Ltd. The silane coupling agents may be used alone or in combination of two or more.

[0076] When containing silane coupling agent, the content of silane coupling agent is preferably more than 1 part by mass, more preferably more than 3 parts by mass, even more preferably more than 5 parts by mass, and even more preferably more than 7 parts by mass, based on 100 parts by mass of silica.On the other hand, the content is preferably less than 20 parts by mass, more preferably less than 18 parts by mass, even more preferably less than 16 parts by mass, and even more preferably less than 14 parts by mass.By making it within the above range, the dispersibility of silica tends to improve.

[0077] (Other compounding agents) In addition to the rubber component and filler, the rubber composition may contain, as appropriate, compounding agents that are conventionally commonly used in the tire industry, such as plasticizers, compatibilizers, processing aids, vulcanized rubber particles, wax, stearic acid, zinc oxide, antioxidants, vulcanizing agents, and vulcanization accelerators.

[0078] <Plasticizer> A plasticizer is a material that imparts plasticity to rubber components and encompasses both liquid and solid plasticizers at 25°C. Examples of plasticizers include resins, oils, liquid polymers, and ester-based plasticizers. These plasticizers may be derived from petroleum, biomass, or naphtha recycled from rubber or non-rubber products. Low-molecular-weight hydrocarbon components obtained by pyrolysis and extraction of used tires or products containing various components may also be used as plasticizers. Plasticizers may be used singly or in combination.

[0079] ·oil Examples of oils include mineral oil, vegetable oil, and animal oil. From the viewpoint of life cycle assessment, waste oils used in rubber mixers and engines, and refined waste cooking oils used in restaurants may also be used. One type of oil may be used alone, or two or more types may be used in combination.

[0080] As used herein, mineral oil refers to oil derived from mineral resources such as petroleum and natural gas. Examples of mineral oil include paraffinic oil (mineral oil), naphthenic oil, and aromatic oil. Specific examples of mineral oil include mild extracted solvate (MES), distillate aromatic extract (DAE), treated distillate aromatic extract (TDAE), treated residual aromatic extract (TRAE), and residual aromatic extract (RAE). Furthermore, as an environmental measure, oils with a low content of polycyclic aromatic compounds (PCA) can also be used. Examples of low PCA oils include MES, TDAE, and heavy naphthenic oil.

[0081] As used herein, examples of vegetable oils include 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, and Japan wax. Further examples of vegetable oils include refined oils (such as salad oil) obtained by refining the above oils, interesterified oils obtained by interesterifying the above oils, hardened oils obtained by hydrogenating the above oils, thermally polymerized oils obtained by thermally polymerizing the above oils, oxidatively polymerized oils obtained by oxidizing the above oils, and waste edible oils recovered from edible oils and the like. Vegetable oils may be liquid or solid at 25°C. One vegetable oil may be used alone, or two or more may be used in combination.

[0082] The vegetable oil according to this embodiment preferably contains acylglycerol, and more preferably triacylglycerol. In this specification, acylglycerol refers to a compound in which a hydroxyl group of glycerin is esterified with a fatty acid. The acylglycerol is not particularly limited and may be 1-monoacylglycerol, 2-monoacylglycerol, 1,2-diacylglycerol, 1,3-diacylglycerol, or triacylglycerol. Furthermore, the acylglycerol may be a monomer, a dimer, or a polymer (trimer or higher). Dimer or higher acylglycerols can be obtained by thermal polymerization, oxidative polymerization, or the like. The acylglycerol may be liquid or solid at 25°C.

[0083] The method for confirming whether the rubber composition contains the acylglycerol is not particularly limited, but may be any of the following: 1 For example, a rubber composition containing triacylglycerol is immersed in deuterated chloroform at 25°C for 24 hours, and after removing the rubber composition, the 1 When H-NMR was measured, signals were observed around 5.26 ppm, 4.28 ppm, and 4.15 ppm when the signal of tetramethylsilane (TMS) was set at 0.00 ppm. These signals are presumed to be signals derived from hydrogen atoms bonded to carbon atoms adjacent to the oxygen atoms of the ester group. In this paragraph, "around" refers to a range of ±0.10 ppm.

[0084] The fatty acid is not particularly limited and may be either an unsaturated fatty acid or a saturated fatty acid. Examples of unsaturated fatty acids include monounsaturated fatty acids such as oleic acid, and polyunsaturated fatty acids such as linoleic acid and linolenic acid. Examples of saturated fatty acids include butyric acid and lauric acid.

[0085] Among these, it is desirable that the fatty acid contains a fatty acid with few double bonds, i.e., saturated fatty acid or monounsaturated fatty acid, and oleic acid is preferred. As a vegetable oil containing such a fatty acid, for example, vegetable oil containing saturated fatty acid or monounsaturated fatty acid may be used, or vegetable oil modified by ester exchange or the like may be used. Furthermore, in order to produce vegetable oil containing such a fatty acid, plants may be improved by breeding, genetic modification, genome editing, or the like.

[0086] As the vegetable oil, for example, commercially available products from Idemitsu Kosan Co., Ltd., Sankyo Yuka Kogyo Co., Ltd., ENEOS Corporation, Orisoi Co., Ltd., H&R Corporation, Toyokuni Oil Mills Co., Ltd., Fuji Kosan Co., Ltd., Nisshin Oillio Group Co., Ltd., etc. can be used.

[0087] Examples of animal oils include fish oil, beef tallow, and oleyl alcohol derived from these.

[0088] The oil content per 100 parts by mass of the rubber component is preferably more than 1 part by mass, more preferably more than 2 parts by mass, and even more preferably 3 parts by mass or more. The content is preferably less than 20 parts by mass, more preferably less than 15 parts by mass, and even more preferably 10 parts by mass or less. The oil content includes the amount of oil contained in the rubber component as an extender oil and the amount of oil contained in other components such as sulfur.

[0089] Liquid polymer Liquid polymers are polymers that are liquid at 25°C, and examples thereof include liquid diene polymers. Examples of liquid diene polymers include liquid styrene-butadiene copolymers (liquid SBR), liquid butadiene polymers (liquid BR), liquid isoprene polymers (liquid IR), and liquid styrene-isoprene copolymers (liquid SIR). The liquid diene polymers preferably have a polystyrene-equivalent number average molecular weight (Mn) measured by gel permeation chromatography (GPC) of more than 1,000, more preferably more than 3,000, while the Mn is preferably less than 100,000, more preferably less than 15,000. The Mn of the liquid polymer is a polystyrene-equivalent value measured by gel permeation chromatography (GPC). Examples of liquid diene polymers that can be used include products from Sartomer Corporation and Kuraray Co., Ltd. Liquid polymers may be used alone or in combination of two or more.

[0090] ·resin Of the other compounding ingredients, the rubber composition preferably contains a resin. The resin is not particularly limited, but resins commonly used in the tire industry can be used, such as aromatic vinyl resins, dicyclopentadiene resins, C9 resins, C5 resins, C5C9 resins, terpene resins, rosin resins, and phenolic resins. Of these, petroleum resins, aromatic vinyl resins, dicyclopentadiene resins, C9 resins, and terpene resins are preferred. One type of resin may be used alone, or two or more types may be used in combination.

[0091] C9 resin The term "C9 resin" refers to a resin obtained by polymerizing a C9 fraction. It may be a C9 fraction polymerized 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. It may also be a hydrogenated or modified version of such a resin. Examples of C9 fractions include at least one petroleum fraction having 8 to 10 carbon atoms selected from the group consisting of vinyltoluene, alkylstyrene, coumarone, indene, methylindene, dicyclopentadiene, etc. Specific examples of C9 resins include coumarone-indene resin, coumarone resin, and indene resin. These resins may be used alone or in combination.

[0092] C5 resin "C5 resin" refers to a resin obtained by polymerizing a C5 fraction other than dicyclopentadiene, and may be a hydrogenated or modified version of such a resin. Examples of C5 fractions other than dicyclopentadiene include at least one petroleum fraction having 4 to 5 carbon atoms selected from the group consisting of cyclopentadiene, isoprene, pentane, isopentane, neopentane, pentene, pentadiene, etc. Such resins may be used alone or in combination of two or more.

[0093] C5C9 resin The term "C5C9 resin" refers to a resin obtained by copolymerizing the C5 fraction and the C9 fraction, and may be a hydrogenated or modified resin. Examples of C5C9 resins that can be used include those commercially available from Tosoh Corporation, LUHUA, and the like. One type of resin may be used alone, or two or more types may be used in combination.

[0094] Dicyclopentadiene Resin The term "dicyclopentadiene-based resin" refers to a resin containing dicyclopentadiene (DCPD) as the monomer component with the highest content, and may be a hydrogenated or modified resin. Examples of dicyclopentadiene-based resins include DCPD / C9 resins obtained by copolymerizing dicyclopentadiene with the C9 fraction, with DCPD / C9 resins being preferred. Examples of DCPD resins that can be used include those commercially available from ExxonMobil Corporation, ENEOS Corporation, Nippon Zeon Co., Ltd., Maruzen Petrochemical Co., Ltd., and the like. These resins may be used singly or in combination of two or more.

[0095] aromatic vinyl resin The term "aromatic vinyl resin" refers to a resin containing at least one aromatic vinyl compound selected from the group consisting of styrene, α-methylstyrene, vinyltoluene, p-chlorostyrene, etc., as the monomer component with the largest content, preferably at least 50 mol %, and may be hydrogenated or modified. As the aromatic vinyl resin, a homopolymer of α-methylstyrene or styrene or a copolymer of α-methylstyrene and styrene is preferred, and a copolymer of α-methylstyrene and styrene is more preferred, because they are economical, easy to process, and have excellent heat generation properties. As the aromatic vinyl resin, commercially available products available from, for example, Kraton, Eastman Chemical, Mitsui Chemicals, Inc., etc., can be used. One type of resin may be used alone, or two or more types may be used in combination.

[0096] Terpene Resin Terpene resins refer to resins containing at least one terpene compound selected from the group consisting of α-pinene, β-pinene, limonene, dipentene, etc., as the most abundant monomer component, preferably at least 50 mol %, and may be hydrogenated or modified. Specific examples of terpene resins include polyterpene resins containing only one or more of the terpene compounds as monomer components; aromatic-modified terpene resins containing the terpene compound and an aromatic compound as monomer components; and terpene phenolic resins containing the terpene compound and a phenolic compound as monomer components. Examples of aromatic compounds that serve as monomer components for aromatic-modified terpene resins include at least one selected from the group consisting of styrene, α-methylstyrene, vinyltoluene, divinyltoluene, etc. Examples of phenolic compounds that serve as monomer components for terpene phenolic resins include at least one selected from the group consisting of phenol, bisphenol A, cresol, xylenol, etc. These resins may be used alone or in combination.

[0097] Rosin-based resin The rosin-based resin refers to a resin containing at least one rosin acid compound selected from the group consisting of abietic acid, neoabietic acid, palustric acid, isopimaric acid, etc., preferably as the monomer component with the largest content, more preferably at least 50 mol %, and may be hydrogenated or modified. The rosin-based resin is not particularly limited, but examples include natural rosin resin and rosin-modified resins obtained by modifying rosin by hydrogenation, disproportionation, dimerization, esterification, etc. Such resins may be used alone or in combination of two or more.

[0098] phenolic resin The phenolic resin refers to a resin containing a phenolic compound such as phenol or cresol as the monomer component with the largest content, preferably 50 mol% or more. Examples of the phenolic resin include, but are not limited to, phenol-formaldehyde resin, alkylphenol-formaldehyde resin, alkylphenol-acetylene resin, and oil-modified phenol-formaldehyde resin. These resins may be used alone or in combination of two or more.

[0099] When a resin is contained, the content per 100 parts by mass of the rubber component is preferably more than 1 part by mass, more preferably more than 1.5 parts by mass, and even more preferably 2 parts by mass or more, while the content is preferably less than 20 parts by mass, more preferably less than 10 parts by mass, even more preferably less than 5 parts by mass, and even more preferably 3 parts by mass or less.

[0100] Ester plasticizers Examples of ester-based plasticizers include dibutyl adipate (DBA), diisobutyl adipate (DIBA), dioctyl adipate (DOA), di-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), and trixylenyl phosphate (TXP). One type of ester-based plasticizer may be used alone, or two or more types may be used in combination.

[0101] <Compatibilizer> Compatibilizers are used to reduce the repulsion energy at the interface between a polymer and a filler or between different polymers, thereby promoting intermixing. There are no particular limitations on the compatibilizer, and any of those conventionally used in the tire industry can be used. Specific examples of compatibilizers include non-reactive compatibilizers such as ethylene-propylene-styrene copolymers, styrene-ethylene-butadiene block copolymers, styrene-methyl methacrylate block copolymers, ethylene-styrene graft copolymers, chlorinated polyethylene, mixtures of aromatic hydrocarbon resins and aliphatic hydrocarbon resins, and metal soaps of unsaturated fatty acids, as well as reactive compatibilizers such as maleic anhydride grafted polypropylene, styrene-maleic anhydride copolymers, ethylene-glycidyl methacrylate copolymers, and styrene graft copolymers onto ethylene-glycidyl methacrylate copolymers. Of these, ethylene-propylene-styrene copolymers are preferred. Compatibilizers may be used alone or in combination of two or more.

[0102] The content of the compatibilizer is not particularly limited, but in consideration of air barrier properties, it is, for example, preferably more than 3 parts by mass, more preferably more than 4 parts by mass, and even more preferably 5 parts by mass or more per 100 parts by mass of the rubber component, while the content is preferably less than 15 parts by mass, more preferably less than 12 parts by mass, and even more preferably less than 10 parts by mass.

[0103] <Processing aids> Examples of processing aids include fatty acid metal salts, fatty acid amides, amide esters, silica surfactants, mixtures of fatty acid metal salts and amide esters, and mixtures of fatty acid metal salts and fatty acid amides. Examples of processing aids that can be used include those commercially available from Schill + Seilacher, Performance Additives, etc. One type of processing aid may be used alone, or two or more types may be used in combination.

[0104] When a processing aid is contained, the content thereof per 100 parts by mass of the rubber component is preferably more than 0.5 parts by mass, more preferably more than 1 part by mass, and even more preferably more than 1.5 parts by mass from the viewpoint of improving processability, and is preferably less than 10 parts by mass, more preferably less than 8.0 parts by mass, and even more preferably less than 5.0 parts by mass from the viewpoint of abrasion resistance and breaking strength.

[0105] <Vulcanized rubber particles> The vulcanized rubber particles are particles made of vulcanized rubber, and specifically, rubber powder as specified in JIS K 6316:2017 can be used. From the standpoint of environmental considerations and cost, recycled rubber powder produced from crushed waste tires is preferred. The vulcanized rubber particles are not particularly limited, and may be unmodified vulcanized rubber particles or modified vulcanized rubber particles. Commercially available vulcanized rubber products include products from Lehigh and Muraoka Rubber Industries Co., Ltd. One type of vulcanized rubber particle may be used alone, or two or more types may be used in combination.

[0106] <Wax> The wax is not particularly limited, and any wax commonly used in the tire industry can be suitably used, such as mineral waxes and plant-derived waxes. Mineral waxes refer to waxes derived from mineral resources such as oil and natural gas. Plant-derived waxes refer to waxes derived from natural resources such as plants. Among these, mineral waxes are preferred. Examples of plant-derived waxes include rice wax, carnauba wax, and candelilla wax. Examples of mineral waxes include paraffin wax, microcrystalline wax, and selected special waxes thereof, with paraffin wax being preferred. The wax according to this embodiment does not contain stearic acid. Waxes that can be used include those commercially available from, for example, Ouchi Shinko Chemical Industry Co., Ltd., Nippon Seiro Co., Ltd., Paramelt Co., Ltd., etc. One type of wax may be used alone, or two or more types may be used in combination.

[0107] When the wax is contained, the amount thereof per 100 parts by mass of the rubber component is preferably more than 0.3 parts by mass, more preferably more than 0.7 parts by mass, and even more preferably more than 1.0 part by mass, while the amount is preferably less than 4.0 parts by mass, more preferably less than 3.0 parts by mass, and even more preferably less than 2.5 parts by mass.

[0108] <Stearic acid> When stearic acid is contained, the content per 100 parts by mass of the rubber component is preferably more than 0.5 parts by mass, more preferably more than 0.7 parts by mass, and even more preferably 1.0 part by mass or more from the viewpoint of processability, while the content is preferably less than 10 parts by mass, more preferably less than 5 parts by mass, and even more preferably less than 3 parts by mass from the viewpoint of vulcanization rate.

[0109] <Zinc oxide> When zinc oxide is contained, the content per 100 parts by mass of the rubber component is preferably more than 0.5 parts by mass, more preferably more than 0.7 parts by mass, and even more preferably 1 part by mass or more, from the viewpoint of processability, while the content is preferably less than 10 parts by mass, more preferably less than 5 parts by mass, and even more preferably less than 3 parts by mass, from the viewpoint of abrasion resistance.

[0110] <Anti-aging agent> The antioxidant is not particularly limited, but examples thereof include naphthylamine-based antioxidants such as phenyl-α-naphthylamine; diphenylamine-based antioxidants such as octylated diphenylamine and 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine; 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-based antioxidants such as diphenyldiamine (DTPD), N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD), and N,N'-di-2-naphthyl-p-phenylenediamine (DNPD); quinoline-based antioxidants such as 2,2,4-trimethyl-1,2-dihydroquinoline polymers; monophenol-based antioxidants such as 2,6-di-t-butyl-4-methylphenol and styrenated phenol; and bis-, tris-, and polyphenol-based antioxidants such as tetrakis-[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane. Among these, p-phenylenediamine-based antioxidants 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 more preferred. Commercially available products that can be used include those from Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Industry Co., Ltd., and Flexis Co., Ltd. One type of antioxidant may be used alone, or two or more types may be used in combination.

[0111] When an antioxidant is contained, the content thereof per 100 parts by mass of the rubber component is preferably more than 0.5 parts by mass, more preferably more than 0.8 parts by mass, and even more preferably more than 1.0 part by mass, while the content is preferably less than 7.0 parts by mass, more preferably less than 5.0 parts by mass, and even more preferably 3.0 parts by mass or less.

[0112] <Vulcanizing agent> The vulcanizing agent is not particularly limited, and known vulcanizing agents can be used, such as organic peroxides, sulfur-based vulcanizing agents, resin vulcanizing agents, and metal oxides such as magnesium oxide. Of these, sulfur-based vulcanizing agents are preferred. Examples of sulfur-based vulcanizing agents that can be used include sulfur and sulfur donors such as morpholine disulfide. Of these, sulfur is preferred. One or more types of vulcanizing agents can be used in combination.

[0113] Examples of sulfur include powdered sulfur, precipitated sulfur, colloidal sulfur, surface-treated sulfur (oil-treated sulfur, special sulfur treated with a dispersant, masterbatch-type sulfur, etc.), and insoluble sulfur (oil-treated insoluble sulfur, etc.), all of which are preferably used. Among these, powdered sulfur is preferred. Examples of sulfur that can be used include those manufactured and sold by Tsurumi Chemical Industry Co., Ltd., Karuizawa Sulfur Co., Ltd., Shikoku Chemical Industry Co., Ltd., Flexis Corporation, Nippon Kanritsu Kogyo Co., Ltd., Hosoi Chemical Industry Co., Ltd., etc.

[0114] Known organic crosslinking agents can also be used as the vulcanizing agent. The organic crosslinking agent is not particularly limited as long as it can form crosslinked chains other than polysulfide bonds. Examples of the organic crosslinking agent include alkylphenol-sulfur chloride condensate, sodium 1,6-hexamethylene-dithiosulfate dihydrate, 1,6-bis(N,N'-dibenzylthiocarbamoyldithio)hexane, and dicumyl peroxide. 1,6-bis(N,N'-dibenzylthiocarbamoyldithio)hexane is preferred. These organic crosslinking agents can be commercially available from Taoka Chemical Co., Ltd., Lanxess K.K., Flexis, and other companies.

[0115] When a vulcanizing agent is contained, the content per 100 parts by mass of the rubber component is preferably more than 0.4 parts by mass, more preferably 0.5 parts by mass or more, and even more preferably 1.0 part by mass or more. On the other hand, the content is preferably less than 6.0 parts by mass, more preferably less than 4.0 parts by mass, and even more preferably less than 2.0 parts by mass. When the content of the vulcanizing agent is within the above range, an appropriate reinforcing effect tends to be obtained. Note that when the vulcanizing agent contains components other than sulfur, such as oil-treated sulfur, the content of the vulcanizing agent refers to the content of the sulfur component itself.

[0116] <Vulcanization accelerator> The vulcanization accelerator is not particularly limited, and known vulcanization accelerators can be used, such as sulfenamide-based, thiazole-based, thiuram-based, thiourea-based, guanidine-based, dithiocarbamic acid-based, aldehyde-amine-based or aldehyde-ammonia-based, imidazoline-based, or xanthate-based vulcanization accelerators. Thiazole-based, sulfenamide-based, thiuram-based, and guanidine-based accelerators are preferred, with thiazole-based and sulfenamide-based accelerators being more preferred. Examples of vulcanization accelerators that can be used include those manufactured and sold by Ouchi Shinko Chemical Industry Co., Ltd., Sanshin Chemical Industry Co., Ltd., and the like. One or more vulcanization accelerators can be used.

[0117] Examples of sulfenamide vulcanization accelerators include N-tert-butyl-2-benzothiazolylsulfenamide (TBBS), N-cyclohexyl-2-benzothiazolylsulfenamide (CBS), and N,N'-dicyclohexyl-2-benzothiazolylsulfenamide (DZ). Examples of thiazole vulcanization accelerators include 2,2'-dibenzothiazolyl disulfide. Examples of thiuram vulcanization accelerators include tetramethylthiuram monosulfide, tetramethylthiuram disulfide, and tetrabenzylthiuram disulfide (TBzTD). Examples of guanidine vulcanization accelerators include 1,3-diphenylguanidine (DPG), di-orthotolylguanidine, and orthotolylbiguanidine.

[0118] The content of the vulcanization accelerator per 100 parts by mass of the rubber component is preferably more than 0.3 parts by mass, more preferably more than 0.5 parts by mass, and even more preferably 1.0 part by mass or more. On the other hand, the content is preferably less than 4.0 parts by mass, more preferably less than 3.0 parts by mass, and even more preferably less than 2.0 parts by mass. When the content of the vulcanization accelerator is within the above range, breaking strength and elongation tend to be ensured.

[0119] In this specification, various materials containing carbon atoms (e.g., rubber, oil, resin, vulcanization accelerator, antioxidant, surfactant, etc.) may be derived from atmospheric carbon dioxide. The compound according to this embodiment may be obtained from carbon dioxide by directly converting carbon dioxide, or by converting methane obtained through a methanation process in which methane is synthesized from carbon dioxide.

[0120] [Rubber composition constituting insulation] The rubber composition constituting the insulation will be described. The rubber composition constituting the insulation will be described below, and the explanation given for the rubber composition constituting the inner liner can be applied in the same manner as long as it does not contradict these explanations.

[0121] <Rubber component> The rubber composition constituting the insulation preferably contains a diene rubber as a rubber component. Examples of such diene rubbers include isoprene rubber (IR rubber) and butadiene rubber (BR). The rubber component can contain rubber components other than IR rubber and BR, such as diene rubbers such as styrene butadiene rubber (SBR), styrene isoprene butadiene rubber (SIBR), chloroprene rubber (CR), and acrylonitrile butadiene rubber (NBR), as well as non-diene rubbers such as butyl rubber, ethylene propylene rubber, polynorbornene rubber, silicone rubber, chlorinated polyethylene rubber, fluororubber (FKM), acrylic rubber (ACM), and hydrin rubber. The rubber component may contain IR rubber and BR, or may further contain SBR. Alternatively, the rubber component may consist solely of IR rubber and BR. The rubber component may be one type alone or two or more types in combination from the above-listed rubbers.

[0122] (Isoprene rubber) Examples of isoprene-based rubbers include natural rubber (NR), isoprene rubber (IR), modified NR, modified NR, and modified IR. Examples of NR include SIR20, RSS#3, TSR20, and SVR-L, which are commonly used in the tire industry. Examples of IR include IR2200 and other commonly used rubbers. Examples of modified NR include deproteinized natural rubber (DPNR) and highly purified natural rubber (UPNR). Examples of modified NR include epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), and grafted natural rubber. Examples of modified IR include epoxidized isoprene rubber, hydrogenated isoprene rubber, and grafted isoprene rubber. Isoprene-based rubbers may be used alone or in combination of two or more.

[0123] The content of the IR rubber in 100% by mass of the rubber component is preferably more than 10% by mass, more preferably more than 20% by mass, even more preferably more than 30% by mass, even more preferably more than 40% by mass, even more preferably more than 50% by mass, and even more preferably more than 60% by mass. On the other hand, the content may be 100% by mass, but is preferably less than 90% by mass, more preferably less than 80% by mass.

[0124] (BR) The BR is not particularly limited, and examples thereof include those commonly used in the tire industry, such as BR with a high cis content, BR containing 1,2-syndiotactic polybutadiene crystals (SPB-containing BR), butadiene rubber synthesized using a rare earth catalyst (rare earth-based BR), tin-modified butadiene rubber modified with a tin compound (tin-modified BR), and other modified butadiene rubbers (modified BR).Commercially available BRs include those from UBE Corporation, JSR Corporation, Asahi Kasei Corporation, and Zeon Corporation. The modified BR may be any BR having a functional group that interacts with a filler such as silica. Examples include terminal-modified BR (terminal-modified BR having the functional group at the terminal) in which at least one terminal of the BR has been modified with a compound (modifier) ​​having the functional group, main-chain-modified BR having the functional group in the main chain, main-chain terminal-modified BR having the functional group in the main chain and at least one terminal (for example, main-chain terminal-modified BR having the functional group in the main chain and at least one terminal modified with the modifier), and terminal-modified BR modified (coupled) with a polyfunctional compound having two or more epoxy groups in the molecule and having a hydroxyl group or epoxy group introduced therein. Examples of the functional group include an amino group, an amide group, a silyl group, an alkoxysilyl group, an isocyanate group, an imino group, an imidazole group, a urea group, an ether group, a carbonyl group, an oxycarbonyl group, a mercapto group, a sulfide group, a disulfide group, a sulfonyl group, a sulfinyl group, a thiocarbonyl group, an ammonium group, an imido group, a hydrazo group, an azo group, a diazo group, a carboxyl group, a nitrile group, a pyridyl group, an alkoxy group, a hydroxyl group, an oxy group, and an epoxy group. These functional groups may have a substituent. Among these, an amino group (preferably an amino group in which a hydrogen atom of the amino group is substituted with an alkyl group having 1 to 6 carbon atoms), an alkoxy group (preferably an alkoxy group having 1 to 6 carbon atoms), and an alkoxysilyl group (preferably an alkoxysilyl group having 1 to 6 carbon atoms) are preferred. BR may be used alone or in combination of two or more types.

[0125] The cis content of BR is preferably more than 90 mol%, more preferably more than 93 mol%, even more preferably more than 95 mol%, and even more preferably 97 mol% or more. The cis content of BR can be measured by the above-mentioned method.

[0126] As the BR, for example, products from UBE Corporation, JSR Corporation, Asahi Kasei Corporation, Nippon Zeon Corporation, etc. can be used.

[0127] The BR content in 100% by mass of the rubber component is preferably more than 5% by mass, more preferably more than 10% by mass, even more preferably more than 20% by mass, and still more preferably more than 25% by mass, while the content is preferably less than 90% by mass, more preferably less than 70% by mass, even more preferably less than 50% by mass, and still more preferably less than 40% by mass.

[0128] (SBR) Styrene-butadiene rubber (SBR) is not particularly limited and includes, for example, unmodified emulsion-polymerized styrene-butadiene rubber (E-SBR) and solution-polymerized styrene-butadiene rubber (S-SBR), as well as modified SBRs such as modified emulsion-polymerized styrene-butadiene rubber (modified E-SBR) and modified solution-polymerized styrene-butadiene rubber (modified S-SBR). Modified SBRs include SBRs whose terminals and / or main chains are modified, and modified SBRs (condensates, branched structures, etc.) coupled with tin or silicon compounds. SBRs include oil-extended types in which flexibility is adjusted by adding an extender oil, and non-oil-extended types in which no extender oil is added, and either type can be used. Examples of such SBRs include those manufactured by JSR Corporation, Asahi Kasei Chemicals Corporation, Nippon Zeon Corporation, and ZS Elastomers Co., Ltd. SBRs can be used alone or in combination of two or more types.

[0129] The styrene content of SBR is preferably more than 15% by mass, more preferably more than 20% by mass, and even more preferably more than 23% by mass. From the viewpoint of fuel economy, the styrene content is preferably less than 40% by mass, more preferably less than 30% by mass, and even more preferably less than 25% by mass. The styrene content of SBR is a value measured by the above-mentioned method.

[0130] The vinyl content of SBR (amount of 1,2-bonded butadiene units) is preferably more than 10 mol%, more preferably more than 15 mol%, and even more preferably more than 17 mol%. The vinyl content is preferably less than 80 mol%, preferably less than 50 mol%, and more preferably less than 30 mol%. The vinyl content of SBR is a value measured by the above-mentioned method.

[0131] The amount of SBR in 100% by mass of the rubber component may be, for example, 0% by mass, or more than 0%, more than 5%, or more than 10% by mass, or may be, for example, less than 90%, less than 50%, or less than 30% by mass.

[0132] (Rubber components synthesized from recycled and biomass-derived raw materials) Monomers, which are structural units of synthetic rubbers such as IR, SBR, and BR, may be derived from underground resources such as petroleum and natural gas, or may be recycled from rubber products such as tires or non-rubber products such as polystyrene. Monomers obtained by recycling (recycled monomers) are not particularly limited, and examples include recycled polyisoprene, recycled butadiene, and recycled aromatic vinyl compounds. Examples of butadienes include 1,2-butadiene and 1,3-butadiene. Examples of aromatic vinyl compounds include, but are not limited to, styrene. Among these, recycled polyisoprene (recycled isoprene), recycled butadiene (recycled butadiene), and / or recycled styrene (recycled styrene) are preferably used as raw materials.

[0133] The method for producing the recycled monomer is not particularly limited, and examples thereof include synthesis from recycled naphtha obtained by decomposing rubber products such as tires. The method for producing recycled naphtha is also not particularly limited, and examples thereof include decomposing rubber products such as tires under high temperature and pressure, decomposing with microwaves, or mechanically crushing and then extracting.

[0134] Furthermore, monomers that are structural units of polymers such as IR, SBR, and BR may be derived from biomass. In this specification, biomass refers to materials derived from natural resources such as plants. Examples of biomass include, but are not limited to, agricultural, forestry, and fishery products, sugar, wood chips, plant residues after useful components have been extracted, plant-derived ethanol, and biomass naphtha. Examples of biomass-derived monomers (biomass monomers) include, but are not limited to, butadiene derived from biomass and aromatic vinyl compounds derived from biomass. Examples of butadienes include 1,2-butadiene and 1,3-butadiene. Examples of aromatic vinyl compounds include, but are not limited to, styrene. Methods for producing biomass monomers are also not limited to, and include, for example, biological and / or chemical and / or physical conversion of plants and animals. Typical biological conversions include microbial fermentation, while examples of chemical and / or physical conversions include catalytic, high-temperature, high-pressure, electromagnetic, and critical fluid conversions, as well as combinations thereof.

[0135] Polymers synthesized from biomass monomer components (biomass polymers) are not particularly limited and include polybutadiene rubber synthesized from biomass-derived butadiene, aromatic vinyl / butadiene copolymers synthesized from biomass-derived butadiene and / or biomass-derived aromatic vinyl compounds, etc. Examples of the aromatic vinyl / butadiene copolymers include styrene-butadiene rubber synthesized from biomass-derived butadiene and / or biomass-derived styrene.

[0136] Whether a polymer's raw material is biomass-derived can be determined by its pMC (percent modern carbon) measured in accordance with ASTM D6866-10. pMC is the modern standard reference carbon. 14 of sample against C concentration 14 This is the ratio of C concentrations and is a value used as an index of the biomass ratio of a compound. The significance of this value is explained below.

[0137] 1 mole of carbon atoms (6.02 × 10 23 ) contains approximately 6.02 × 10 atoms, which is about one trillionth of the number of ordinary carbon atoms. 11 pieces 14 C exists. 14 The half-life of C is 5730 years, 14 C is decreasing regularly. Therefore, in the case of fossil fuels such as coal, oil, and natural gas, which are thought to have been absorbed and fixed by plants and other organisms more than 226,000 years ago, C was also included in these when they were first fixed. 14 All C elements have decayed. Therefore, in the 21st century, fossil fuels such as coal, oil, and natural gas contain 14 Therefore, chemicals produced from these fossil fuels do not contain any C element. 14 It does not contain any C element.

[0138] on the other hand, 14 C is constantly produced by cosmic rays undergoing nuclear reactions in the atmosphere. 14 The amount of C is balanced between radioactive decay and nuclear reaction, and in the Earth's atmospheric environment, 14 Therefore, the amount of carbon derived from biomass resources currently circulating in the environment is constant. 14 As mentioned above, the C concentration is approximately 1 × 10 -12 The value is approximately mol %. Therefore, the biomass ratio in a compound can be calculated by using the difference between these values.

[0139] this14 C is typically measured using accelerator mass spectrometry based on a tandem accelerator. 13 C concentration ( 13 C / 12 C). 14 C concentration ( 14 C / 12 C) is measured. 14 The modern standard reference for the C concentration is the carbon circulating in nature as of 1950. 14 The specific standard substance used is the oxalic acid standard provided by NIST (National Institute of Standards and Technology). The specific activity of carbon in this oxalic acid (per gram of carbon) is 14 The radioactivity of C is separated into carbon isotopes, 13 The standard value is the value corrected for decay from 1950 to the measurement date. 14 This is used as the C concentration value (100%). The ratio of this value to the value of the actually measured sample is the pMC value.

[0140] Therefore, if rubber is made from 100% biomass-derived materials, although there are regional differences, it will usually not reach 100 under normal conditions, so it will show a value of approximately 110 pMC. On the other hand, for chemical substances derived from petroleum and other fossil fuels, 14 When the carbon concentration is measured, it will show a value of about 0 pMC (for example, 0.3 pMC), which corresponds to the above-mentioned biomass ratio of 0%.

[0141] From the above, it is preferable in terms of environmental protection to use a material such as rubber having a high pMC value, that is, a material such as rubber having a high biomass ratio, in a rubber composition.

[0142] (filler) The filler includes carbon black. The carbon black includes recycled carbon black (rCB). The filler may also include fillers other than carbon black. Examples of such fillers include silica, aluminum hydroxide, calcium carbonate, alumina, clay, talc, and other fillers that have been commonly used in the tire industry. The filler may contain carbon black and silica, may consist of only carbon black and silica, or may consist of only carbon black. Other descriptions of the filler that are applicable to the innerliner are equally applicable.

[0143] (Other compounding agents) In addition to the rubber component and filler, the rubber composition may contain, as appropriate, compounding agents conventionally commonly used in the tire industry, such as plasticizers, compatibilizers, processing aids, vulcanized rubber particles, wax, stearic acid, zinc oxide, antioxidants, vulcanizing agents, vulcanization accelerators, etc. The explanations given for the rubber composition for an inner liner are similarly applicable to these compounding agents.

[0144] [Rubber composition constituting tire components other than inner liner and insulation] The explanation given for the rubber composition constituting the insulation can be similarly applied to the rubber composition constituting the tire components other than the inner liner and the insulation.

[0145] <Manufacturing method> The tire according to this embodiment can be manufactured by a known method.

[0146] (Production of rubber composition) Each of the above rubber compositions can be produced by a known method. For example, they can be produced by kneading the above components using a rubber kneading device such as an open roll or an internal kneader (e.g., a Banbury mixer or kneader). The kneading process may include, for example, a base kneading process in which compounding ingredients and additives other than the vulcanizing agent and vulcanization accelerator are kneaded, and a final kneading (F kneading) process in which the vulcanizing agent and vulcanization accelerator are added to the kneaded product obtained in the base kneading process and kneaded. Furthermore, the base kneading process can be divided into multiple processes as desired. The kneading conditions are not particularly limited, but examples include a method in which the base kneading process involves kneading for 3 to 10 minutes at a discharge temperature of 130 to 170°C, and a method in which the final kneading process involves kneading for 1 to 5 minutes at 50 to 110°C.

[0147] (tire manufacturing) Each rubber composition obtained above is extruded in the unvulcanized state to form a desired tire component. The tire component is, for example, at least one selected from the group consisting of a tread, a full band, a belt, a carcass, an insulation, an inner liner, a sidewall, a clinch, a wing, and the like. The tire component thus obtained can be molded together with other tire components in a tire building machine by a conventional method to form an unvulcanized tire. The tire of this embodiment can be manufactured by heating and pressurizing (vulcanizing) the unvulcanized tire in a vulcanizer. The vulcanization conditions are not particularly limited, and examples thereof include vulcanization at 150 to 200°C for 5 to 30 minutes.

[0148] <Application> In this specification, the term "tire" refers to a tire that can be used for any purpose, regardless of whether it is a pneumatic tire or a non-pneumatic tire, and can be used as a passenger car tire, a large passenger car tire, a large SUV tire, a racing tire, a motorcycle tire, a heavy-duty tire, or a run-flat tire. Passenger car tires are tires designed to be mounted on four-wheeled vehicles and have a maximum load capacity of less than 1,400 kg. Heavy-duty tires are tires with a maximum load capacity of 1,400 kg or more. In this specification, the term "tire" refers to all-season tires, summer tires, and winter tires such as studless tires. [Example]

[0149] Below, examples (working examples) that are considered preferable for carrying out the present invention are shown, but the scope of the present invention is not limited to these working examples. Tires obtained according to each table were examined using the various chemicals shown below, and the results calculated based on the evaluation method below are shown as durability indexes at the bottom of each table.

[0150] <Various chemicals> The various chemicals used in the examples and comparative examples are summarized below. Butyl rubber 1: Chlorinated butyl rubber (ENEOS Material Corporation, CIIR 1066) Butyl rubber 2: Brominated butyl rubber (ENEOS Material Corporation, IIR 2222) IR rubber: Natural rubber (SVR-L) BR: butadiene rubber (UBE Corporation, BR150B, cis content: 97 mol%, vinyl content: 1 mol%) SBR: Emulsion-polymerized styrene-butadiene rubber (ESBR1502, manufactured by ENEOS Materials Corporation, styrene content: 23.5% by mass, vinyl content: 18% by mole, non-oil-extended) rCB1: Recycled carbon black (average primary particle size: 45 nm, ash content: 13% by mass or more) rCB2: Recycled carbon black (average primary particle size: 55 nm, ash content: 13% by mass or more) rCB3: Recycled carbon black (average primary particle size: 30 nm, ash content: 13% by mass or more) rCB4: Recycled carbon black (average primary particle size: 50 nm, ash content: 13% by mass or more) CB: Carbon black (N550, average primary particle size: 44 nm, ash content: less than 13% by mass) Oil: Aromatic process oil (Idemitsu Kosan Co., Ltd., Diana Process NH-70S) Zinc oxide: Zinc oxide type 2 (manufactured by Mitsui Mining & Smelting Co., Ltd.) Stearic acid: Camellia stearate beads (NOF Corporation) Resin: C5C9 resin (Tosoh Corporation, Petrotack 100V, softening point: 96°C) Compatibilizer: Ethylene-propylene-styrene copolymer (Flow Polymers Inc., Promix 400) Sulfur: HK-200-5 (Hosoi Chemical Industry Co., Ltd., powdered sulfur, oil content: 5% by mass) Vulcanization accelerator 1: Noccela DM (Ouchi Shinko Chemical Industry Co., Ltd., 2,2'-dibenzothiazolyl disulfide) Vulcanization accelerator 2: Noccela CZ (Ouchi Shinko Chemical Industry Co., Ltd., N-cyclohexyl-2-benzothiazole sulfenamide)

[0151] <Rubber composition for inner liner and tire> According to the compounding recipes shown in Tables 1 and 2, a 1.7 L internal Banbury mixer is used to knead the chemicals other than sulfur and the vulcanization accelerator for 4 minutes until the discharge temperature reaches 130°C, to obtain a kneaded mixture. Next, a two-screw open roll is used to add sulfur and the vulcanization accelerator to the kneaded mixture, and the mixture is kneaded for 4 minutes until the temperature reaches 80°C, to obtain an unvulcanized rubber composition for an inner liner.

[0152] According to the descriptions in Tables 1 and 2, the unvulcanized rubber composition for the inner liner is molded into the shape of an inner liner, and then laminated with other components to form an unvulcanized tire. Each test tire (size: 195 / 65R15) is manufactured by press-vulcanizing the tire at 170°C for 12 minutes.

[0153] <Rubber composition for insulation and tire> According to the compounding recipes shown in Tables 3 and 4, chemicals other than sulfur and vulcanization accelerators are kneaded for 5 minutes at a discharge temperature of 150°C using a 1.7 L internal Banbury mixer. Next, sulfur and vulcanization accelerators are added to the kneaded mixture obtained, and the mixture is kneaded with an open roll for 4 minutes until the temperature reaches 105°C, to obtain an unvulcanized rubber composition for insulation.

[0154] According to the descriptions in Tables 3 and 4, the unvulcanized rubber composition for insulation is molded into the shape of insulation, and then laminated with other components to form an unvulcanized tire. Each test tire (size: 195 / 65R15) is manufactured by press-vulcanizing the tire at 170°C for 12 minutes.

[0155] <Durability> Each test tire is mounted on a standard rim and inflated with air. The tire is then mounted on a drum-type running test machine and a specified load is applied. The tire is run on the drum at a specified speed, and the running distance until changes occur in the inner liner or insulation is measured. The results are expressed as an index, with the running distance of the comparison standard example being set at 100, and the higher the index, the better.

[0156] [Table 1]

[0157] [Table 2]

[0158] [Table 3]

[0159] [Table 4]

[0160] <Embodiment> The following describes a preferred embodiment.

[0161] [1] A tire having a tire component made of a rubber composition, The rubber composition includes a rubber component and carbon black, the average primary particle diameter of the carbon black is 50.0 nm or less, preferably less than 50.0 nm, and more preferably less than 48.0 nm; The carbon black comprises recycled carbon black, The content (parts by mass) of the carbon black relative to 100 parts by mass of the rubber component is A CB The average primary particle diameter (nm) of the carbon black is defined as D CB When the maximum thickness (mm) of the tire component is T, A CB , D CB and T satisfies the following formula, and the right side of the following formula is preferably 4000, more preferably 3800, even more preferably 3700, and still more preferably 3500. (1) (A CB ×D CB ) / T<4500 [2] The tire according to the above [1], wherein the right side of the formula (1) is 3000, preferably 2800, and more preferably 2600. [3] A CB is 20 or more and 100 or less, preferably more than 20 parts by mass and less than 100 parts by mass, more preferably more than 30 parts by mass and less than 100 parts by mass, even more preferably more than 40 parts by mass and less than 100 parts by mass, even more preferably more than 50 parts by mass and less than 100 parts by mass, even more preferably more than 60 parts by mass and less than 100 parts by mass, and even more preferably more than 70 parts by mass and less than 100 parts by mass. [4] D above CBThe tire according to any one of the above [1] to [3], wherein the average particle size is 47.0 nm or less, preferably less than 46.0 nm, more preferably 45.0 nm or less, even more preferably less than 40.0 nm, even more preferably less than 39.0 nm, even more preferably less than 38.0 nm, even more preferably less than 37.0 nm, even more preferably less than 36.0 nm, even more preferably less than 35.0 nm, and even more preferably less than 32.0 nm. [5] The tire according to any one of the above [1] to [4], wherein the tire component is an inner liner. [6] The tire according to any one of the above [1] to [4], wherein the tire component is insulation. [Explanation of symbols]

[0162] 1 tire 2. Insulation 3 Inner liner 4 Sidewall 5 Clinch 6 Wing T2 Insulation Thickness T3 Inner liner thickness T4 Sidewall Thickness T5 Clinch Thickness T6 Wing Thickness P1: The point where the sidewall and clinch meet on the outer surface of the tire L1 Normal to the main body of the carcass P2 The point where the tread contour line on the outside in the tire width direction intersects with the sidewall contour line on the outside in the tire radial direction L2 Normal to outer tire surface CL Tire centerline R rim

Claims

1. A tire having a tire component made of a rubber composition, The rubber composition includes a rubber component and carbon black, The carbon black has an average primary particle diameter of 50.0 nm or less, The carbon black comprises recycled carbon black, The content (parts by mass) of the carbon black relative to 100 parts by mass of the rubber component is A CB and the average primary particle diameter (nm) of the carbon black is D CB and the maximum thickness (mm) of the tire component is T, A CB , D CB and a tire where T satisfies the following formula: (1) (A CB ×D CB ) / T<4500

2. The tire according to claim 1, wherein the right side of the formula (1) is 3,000.

3. The above A CB The tire according to claim 1, wherein is 20 or more and 100 or less.

4. The above D CB 2. The tire of claim 1, wherein the axial length is 47.0 nm or less.

5. The tire according to any one of claims 1 to 4, wherein the tire component is an inner liner.

6. The tire according to any one of claims 1 to 4, wherein the tire component is insulation.

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