Tire

Abstract

The purpose of the present invention is to improve the durability of a tire on which an electronic component is mounted during traveling. A tire is provided with a carcass layer and a bead section comprising a tread section, a bead apex, and a bead core, and is characterized in that an electronic component is provided between the bead apex and the carcass layer, and the bead apex and the carcass layer are bonded to each other at a temperature of 70 DEG C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%. In the deformation mode, the loss tangent 70 DEG C tan [delta] BA of the bead apex measured under tension and the tire circumferential length L (mm) of the electronic component satisfy the following formula 1. Tan delta BA * Llt at the temperature of 70 DEG C; and 15 (Formula 1).

Description

Technical Field

[0001] The invention relates to a tire in which electronic components such as RFID are embedded. Background Art

[0002] In recent years, it has been proposed to embed electronic components such as RFID (Radio Frequency Identification) transponders (hereinafter also referred to as "RFID") into tires for the purpose of recording information about the tire during manufacturing / shipping, information during driving, etc., and communicating with the outside (for example, Patent Documents 1 to 4). [Prior art literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-506676 [Patent Document 2] Japanese Patent Publication No. 2021-514891 [Patent Document 3] Japanese Patent Application Publication No. 2021-084510 [Patent Document 4] Japanese Patent Application Publication No. 2021-127114 Summary of the invention [Problems to be solved by the invention]

[0004] However, when electronic components are embedded in an unvulcanized tire and integrated with the tire, the electronic components and rubber components may be separated due to impact loads during running, thereby reducing the durability of the tire.

[0005] Therefore, an object of the present invention is to improve the durability of a tire equipped with an electronic component during driving.

Methods to solve the problem

[0006] The present invention relates to a tire, characterized in that: The tire comprises: a bead portion consisting of a tread portion, a bead apex rubber and a bead core, and a carcass layer. An electronic component is arranged between the bead apex rubber and the carcass layer. Under the conditions of temperature 70℃, frequency 10Hz, initial strain 5%, dynamic strain rate 1%, the loss tangent 70℃tanδBA of the above bead apex rubber measured in deformation mode: tension is The tire circumferential length L (mm) of the electronic component satisfies the following (Formula 1): 70℃tanδBA×L<15 (Formula 1). Effects of the Invention

[0007] According to the present invention, the durability of a tire equipped with an electronic component during running can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008]

Figure 1

Figure 4

Figure 5

[0009] [1] Characteristics of the tire according to the present invention First, the features of the tire according to the present invention will be described.

[0010] 1. Summary The tire of the present invention comprises a bead portion consisting of a tread portion, a bead apex rubber and a bead core, and a carcass, wherein an electronic component is disposed between the bead apex rubber and the carcass layer. At the same time, under the conditions of a temperature of 70°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, the loss tangent 70°C tanδBA of the bead apex rubber measured in a deformation mode: tension and the tire circumferential length L (mm) of the electronic component satisfy the following (Formula 1), 70℃tanδBA×L<15 (Formula 1).

[0011] By having these features, as described below, the durability of the tire equipped with the electronic component during running can be improved.

[0012] 2. Principle of the effect presented in the tire of the present invention The principle of the above-described effects exhibited in the tire according to the present invention is considered to be as follows.

[0013] As described above, in the tire according to the present invention, the electronic component is provided between the bead apex rubber and the carcass layer.

[0014] The carcass layer is a tire component constituting the tire frame, and compared with other tire components, has a much higher elastic modulus. Simultaneously, it can be considered that the carcass layer constituting the tire frame is the center when the tire is deformed, so the deformation amount when traveling near the carcass layer is smaller than that around.

[0015] On the other hand, it is considered that since the bead portion composed of the bead apex rubber and the bead core is the portion fixed to the rim, the bead apex rubber connected to the bead core fixed to the rim has a smaller amount of deformation during running.

[0016] Therefore, it can be considered that when electronic components are provided between the bead apex rubber and the carcass layer, the deformation around the electronic components during driving is reduced, which can prevent the electronic components from peeling off inside the tire. As a result, damage to the tire can be prevented, thereby improving the durability of the tire equipped with electronic components during driving.

[0017] As described above, it is considered that the amount of deformation of the bead apex during running is small, but even so, it will deform along the carcass layer when the tire rotates, accompanied by heat.

[0018] It is believed that when the bead apex rubber generates excessive heat, the temperature near the electronic components rises, which may cause the electronic components to peel off in the tire. Therefore, it is necessary to fully suppress the heat generation of the bead apex rubber. On the other hand, since the electronic components are formed of a material different from rubber, stress is more likely to be concentrated on the interface of the electronic components than the surrounding components. Depending on the degree of stress, the electronic components may peel off. Therefore, it is believed that it is necessary to appropriately control the relationship between the loss tangent of the bead apex rubber and the tire circumferential length of the electronic components.

[0019] That is, the loss tangent tanδ is a viscoelastic parameter that indicates the energy absorption performance. The larger the value, the more energy is absorbed, the more heat is generated, and the deformation occurs. On the other hand, the smaller the tire circumferential length of the electronic component is, the easier it is to release heat, and the heat generation can be suppressed. Therefore, it can be considered that if the product of the loss tangent of the bead apex rubber and the tire circumferential length of the electronic component can be controlled below a certain value, the heat generated between the bead filler layer and the electronic component in the area where the electronic component contacts can be suppressed, the adhesion can be easily improved, and the peeling of the electronic component in the tire can be suppressed. As a result, the damage to the tire can be suppressed, and the durability of the tire equipped with the electronic component during driving can be improved.

[0020] Specifically, it can be considered that when the product of the loss tangent 70°C tanδBA of the bead apex rubber measured in the deformation mode: tension and the tire circumferential length L (mm) of the electronic component (70°C tanδBA×L) is less than 15 under the conditions of temperature 70°C, frequency 10Hz, initial strain 5%, and dynamic strain rate 1%, the heating of the bead apex rubber and the peeling of the electronic component in the tire can be fully suppressed, and the durability of the tire equipped with the electronic component during driving can be improved. In addition, it is more preferably 13 or less, and more preferably 10 or less.

[0021] As described above, it can be considered that in the tire involved in the present invention, electronic components are arranged between the bead apex rubber and the carcass layer, which can reduce the deformation around the electronic components during driving, inhibit the electronic components from peeling off and being damaged in the tire, and at the same time, control the product of the loss tangent of the bead apex rubber and the circumferential length of the electronic components in the tire to be below a certain value, thereby fully inhibiting the heating of the bead apex rubber and the peeling off of the electronic components in the tire, thereby improving the durability of the tire equipped with electronic components during driving.

[0022] In the above, the loss tangent (tan δ) can be measured using a viscoelasticity measuring device such as "EPLEXOR (registered trademark)" manufactured by GABO Corporation.

[0023] [2] A more preferred embodiment of the tire according to the present invention The tire according to the present invention can achieve greater effects by adopting the following aspects.

[0024] 1. Loss tangent of the tread In the present invention, the loss tangent 30°C tanδTR of the tread portion measured in the deformation mode: tension under the conditions of temperature 30°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% is preferably less than 0.25. It is believed that by setting the 30°C tanδTR to a smaller value in this way, the heat generated by the tread portion during driving can be reduced and the temperature rise of the entire tire can be suppressed, so that the durability of the tire equipped with electronic components during driving can be further improved.

[0025] At this time, under the conditions of temperature 0°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%, the loss tangent 0°C tanδTR of the tread portion measured in the deformation mode: tension is more preferably greater than 0.50. It is believed that by increasing the loss tangent tanδ at low temperatures in this way, the vibration caused by the influence of the road surface during driving can be suppressed on the surface of the tread portion, and the deformation of the bead portion caused by the vibration on the surface of the tread portion can be fully suppressed, further improving the durability of the tire equipped with electronic components during driving.

[0026] In addition, the "tread portion" is a component forming the area of ​​the tire's contact surface, and refers to a portion that is radially outside the tire compared to components such as the carcass, belt layer, and belt reinforcement layer that contain fiber materials. The tread portion can be formed by only one running surface rubber layer, or by providing a base rubber layer on the inner side of the running surface rubber layer to form two layers, or three layers, or more than four layers. In this case, the thickness of the running surface rubber layer in the entire tread portion is preferably 10% or more. In addition, the thickness of the running surface rubber layer in the entire tread portion is more preferably 70% or more.

[0027] The thickness of the above-mentioned running surface rubber layer and the thickness of the base rubber layer can be calculated by the sum of the thickness of the running surface rubber layer and the thickness of the base rubber layer in the thickness of the tread portion measured in a cross-section of the tire cut radially with the bead portion set to a state suitable for the regular rim width.

[0028] Here, "regular rim" means: a rim whose standard is specified for each tire in the standard system including the standard on which the tire is based, for example, a standard rim in the applicable size recorded in the "JATMA Yearbook" of JATMA (Japan Automobile Tire Association), a "measuring rim" recorded in the "STANDARDS MANUAL" of the European Tire and Rim Technical Organisation (ETRTO), and a "design rim" recorded in the "Yearbook (YEAR BOOK)" of the American Tire and Rim Association (TRA). Reference is made in the order of JATMA, ETRTO, and TRA, and when referring to applicable sizes, the standards are followed. In addition, for tires not specified in the standards, the rim with the smallest rim diameter and the narrowest rim width is the rim that can be assembled and maintain the internal pressure, that is, the rim / tire without leakage.

[0029] 2. Tire weight and maximum load capacity In the present invention, the ratio of the tire weight (kg) to the maximum load capacity (kg) of the tire (tire weight / maximum load capacity) is preferably less than 0.0150. It is believed that the rubber thickness of a tire with a smaller tire weight than the maximum load capacity of the tire is relatively thin, thereby suppressing the temperature rise of the entire tire and further improving the durability of the tire equipped with electronic components during driving.

[0030] In the above description, "tire weight (kg)" refers to the weight of the tire alone excluding the weight of the rim.

[0031] Meanwhile, the "maximum load capacity (kg)" can be obtained as WL by the following formula when the tire cross-section width is Wt (mm), the tire cross-section height is Ht (mm), and the tire outer diameter is Dt (mm) measured under normal conditions. Here, the tire cross-section width Wt is the maximum width between the outer surfaces of the tire sidewalls after removing the patterns or text on the tire sidewalls under normal conditions. Meanwhile, the tire cross-section height Ht is 1 / 2 of the difference between the outer diameter of the tire and the nominal rim diameter. V = {(Dt / 2) 2 -(Dt / 2-Ht) 2}×π×Wt WL=0.000011×V+100

[0032] In the above description, "normal state" means: an unloaded state assembled on a normal rim and filled with a normal internal pressure. In addition, "normal internal pressure" means: in the standard system including the standards on which the tire is based, each standard is the specified air pressure for each tire, and refers to the maximum value recorded in JATMA's "Maximum Air Pressure", ETRTO's "Inflation Pressure (INFLATION PRESSURE)", and TRA's table "Tire Load Limits at VARIOUS COLD INFLATION PRESSURES". Reference is made in the order of JATMA, ETRTO, and TRA. When referring to an applicable size, follow its standard. In the case of a tire not specified in the standard, it refers to the normal internal pressure (of which 250KPa or more) of other tire sizes (tires specified in the standard) recorded as standard rims on the above-mentioned normal rims. In addition, when there are multiple normal internal pressures of 250KPa or more, it refers to the minimum value among them.

[0033] 3. Tire radial distance from the upper end of the bead core to the electronic components The farther the embedded position of the electronic component is from the bead core, that is, the larger the tire radial distance D2 from the upper end of the bead core to the electronic component, the easier it is for the bead apex to deform and become easily heated. Therefore, the larger the tire radial distance D2 from the upper end of the bead core to the electronic component, the smaller the 70°C tanδBA is, and the heat generation is suppressed, which is preferred.

[0034] That is, it is believed that by controlling the product of 70°C tanδBA and the tire radial distance D2 (mm) from the upper end of the bead core to the electronic component to be below a certain value, heat generation can be suppressed and the durability of the tire equipped with electronic components during driving can be further improved.

[0035] Specifically, it is considered that when the product of 70°C tanδBA and the tire radial distance D2 (mm) from the upper end of the bead core to the electronic component is 8.5 or less, heat generation can be appropriately suppressed and the durability of the tire equipped with the electronic component during driving can be further improved.

[0036] In the above description, "the upper end of the bead core" refers to the outer edge of the bead core in the tire radial direction.

[0037] At this time, the height of the bead apex rubber, that is, the ratio (D2 / H) of D2 (mm) to the distance H (mm) from the upper end of the bead core to the front end top of the bead apex rubber is preferably greater than 0.2 and less than 0.8. By arranging electronic components at such a position, heat generation and peeling can be appropriately suppressed.

[0038] 4. Loss tangent of the overlap In a tire, a lap portion is usually provided on the outer side of the tire width direction than the bead portion, and is fixed to the rim during installation. Therefore, it can be considered that, like the bead portion, the deformation amount during driving is small, but even so, the tire will deform and generate heat when it rotates.

[0039] Therefore, it is preferred to control not only the product of 70℃tanδBA and L (mm) (70℃tanδBA×L) mentioned above, but also the product of 70℃tanδCA and L (mm) (70℃tanδCA×L) of the loss tangent of the lap portion measured under the deformation mode: tension at 70℃, frequency 10Hz, initial strain 5%, and dynamic strain rate 1%.

[0040] Specifically, it is believed that by controlling ((70°C tanδBA+70°C tanδCA)×L) to 25 or less, deformation of the bead portion and the clinch portion during driving can be sufficiently suppressed, further improving the durability of the tire equipped with electronic components during driving.

[0041] 5. Complex elastic modulus of bead apex rubber and lap joint (1) It is believed that as the length L increases, the length of the electronic component in contact with the surrounding becomes longer, so stress concentration is more likely to occur, and it is more likely to produce a starting point for peeling. Therefore, it is preferred to increase the sum of the complex elastic modulus of the bead apex rubber and the lap portion relative to the length L to suppress stress concentration.

[0042] Specifically, it can be considered that 70°C E * BA and 70℃E * The sum of CA (70℃E * BA+70℃E * Ratio of CA) to L (mm) (70℃E * BA+70℃E * When the ratio CA) / L) is 0.5 or more, the concentration of stress can be sufficiently suppressed, and the durability of the tire equipped with the electronic component during running can be further improved.

[0043] In addition, the above 70℃E * BA and 70℃E * The measurement of CA can be performed in the same manner as the measurement of the loss tangent, for example, using a viscoelasticity measuring apparatus such as "EPLEXOR (registered trademark)" manufactured by GABO Corporation.

[0044] (2) In addition, although in the above, as much as possible, the concentration of stress is suppressed by increasing the ratio of the sum of the complex elastic moduli of the bead apex rubber and the overlap portion relative to the length L, it is also preferred to increase the ratio of the complex elastic modulus of the bead apex rubber that directly contacts the electronic component relative to the length L.

[0045] That is, it is considered that by increasing the complex elastic modulus of the bead apex rubber, deformation of the bead apex rubber can be suppressed and heat generation can be suppressed. * Ratio of BA to L (mm) (70℃E * When BA / L) is 0.5 or more, it can have sufficient rigidity relative to L, sufficiently suppress the heating or deformation of the bead apex rubber, and further improve the durability of the tire equipped with electronic components during driving.

[0046] (3) It can be considered that, as mentioned above, the longer the length L becomes, the longer the length of the electronic component in contact with its surroundings becomes, and the starting point of peeling is likely to occur. While increasing the ratio of the complex elastic modulus of the bead apex rubber to the complex elastic modulus of the lap joint, by increasing this ratio relative to the length L, it becomes easier to suppress the deformation of the contact portion between the electronic component and its surroundings, thereby further improving the durability of the tire equipped with the electronic component during driving.

[0047] Specifically, it can be considered that 70°C E * BA relative to 70℃E * CA ratio (70℃E * BA / 70℃E * ratio of CA) to length L ((70℃E * BA / 70℃E * When CA) / L) is 0.05 or more, the deformation of the contact portion between the electronic component and its surroundings can be suppressed, and the durability of the tire equipped with the electronic component during driving can be further improved.

[0048] At the same time, the larger the tire radial distance D2 from the upper end of the bead core to the electronic component, the easier it is for the bead apex to deform and generate heat. Therefore, it is preferred to increase the tire radial distance D2 from the upper end of the bead core to the electronic component by 70°E. * BA.

[0049] Specifically, 70℃E * The ratio of BA to D2 (70℃E * When BA / D2) is greater than 0.85, the deformation or heat generation of the bead apex rubber can be sufficiently suppressed, and the durability of the tire equipped with electronic components during driving can be further improved.

[0050] 6. Electronic components In the present invention, RFID or a sensor is preferably used as an electronic component. Considering that RFID can store and read a large amount of information without contact, it is more preferable to store not only data such as pressure and temperature, but also manufacturing information and management information of tires, customer information, etc. Specific sensors include, for example, pressure sensors, temperature sensors, acceleration sensors, magnetic sensors, groove depth sensors, etc.

[0051] At the same time, it is preferable to provide an adhesive layer or a plating layer on the surface of the electronic component to improve the adhesiveness with the rubber. This can sufficiently suppress the peeling of the electronic component.

[0052] As a specific adhesive layer, a known metal-rubber adhesive can be used, which can be purchased from LORD Corporation, etc. The plating layer preferably contains copper, and is preferably alloyed with tin, nickel, iron, zinc, cobalt, aluminum, magnesium, etc., for example.

[0053] In addition, the surface of the electronic component is preferably provided with an electronic component covering layer having a thickness of 0.5 mm or more. Thus, by providing a suitable interval between the bead apex rubber and the carcass layer adjacent to the electronic component, it is less susceptible to deformation at the interface and can fully suppress the peeling of the electronic component.

[0054] As a specific electronic component covering layer, for example, a rubber composition or a thermoplastic elastomer composition can be used. For example, the rubber composition described in this specification or a rubber composition known in the field of tires can be mentioned.

[0055] Meanwhile, the product of the shortest distance D1 (mm) to the tire outer surface and the weight W (g) of the electronic component (D1×W) is preferably 2.5 or less. By controlling D1×W to such a value, deformation around the electronic component can be sufficiently suppressed, and peeling can be suppressed.

[0056] In addition, in the present invention, the length of the electronic component in the longitudinal direction (including the antenna) is preferably 80 mm or less, and more preferably 50 mm or less. It is believed that by setting such a size, the electronic component can be properly attached to the tire component while suppressing the generation of local stress concentration, thereby fully suppressing peeling and further improving the durability of the tire equipped with the electronic component during driving.

[0057] [3] Implementation Method The present invention will be described in detail below based on the embodiments.

[0058] 1. Tire according to the present embodiment Figure 1 , Figure 2 It is a schematic cross-sectional view showing the structure of a tire according to one embodiment of the present invention. Figure 1 , Figure 2 In the figure, 1 is a tire, 2 is a bead portion, 3 is a sidewall portion, 4 is a tread portion, 31 is a sidewall portion, 32 is a carcass layer, 33 is an inner liner layer, and 34 is an electronic component. The carcass layer 32 is formed along the bead core 21 and the bead apex rubber 22 constituting the bead portion 2, and after the lower end of the bead core 21 is folded back from the inner side to the outer side in the tire width direction, it is bonded to the inner carcass layer 32. At the same time, a bead chafer 24 is provided on the inner side of the bead portion 2 in the tire width direction, and a lap portion 23 extending to the bead chafer 24 is provided on the outer side in the tire width direction.

[0059] like Figure 1 and Figure 2 As shown, in this embodiment, the electronic component 34 is disposed between the bead apex rubber 22 and the carcass layer 32. Here, "the electronic component is disposed between the bead apex rubber and the carcass layer" means: it also includes the case where the electronic component is disposed between the surfaces on the opposite sides of the surfaces where the bead apex rubber and the carcass layer contact each other, and is embedded in the bead apex rubber and the carcass layer.

[0060] For example, Figure 1 In the embodiment, an electronic component 34 is provided between the bead apex rubber 22 and the carcass layer 32 on the inner side in the tire width direction. Figure 2 In the embodiment of the present invention, an electronic component 34 is provided between the bead apex 22 and the carcass layer 32 on the outer side in the tire width direction.

[0061] Figure 3 Schematic plan views showing the electronic components used in this embodiment, with (a) and (b) being two examples. Figure 3 As shown in (a) and (b), the electronic component 34 is composed of a main body 34a composed of an IC chip and an antenna 34b.

[0062] By setting such a structure, the bead apex rubber 22, the overlap portion 23, and the tread portion 4 meet the above-mentioned parameters, so that the deformation around the electronic components can be sufficiently reduced, and the breakage and damage of the electronic components can be suppressed, thereby improving the durability of the tire equipped with electronic components during driving.

[0063] 2. Rubber composition In the present embodiment, the above-mentioned rubber compositions constituting the bead apex rubber, the lap portion and the tread (hereinafter respectively referred to as "rubber composition for bead apex rubber", "rubber composition for the lap portion" and "rubber composition for the tread") can be obtained by mixing various compounding materials such as rubber components, reinforcing materials, antioxidants, oils, resin materials, antioxidants and additives.

[0064] (1) Compounding materials (a) Rubber component In each rubber composition, the rubber component is not particularly limited, for example, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR) and other diene rubbers can be used. These can be used alone or in combination of two or more. For example, in the rubber composition for bead apex rubber or the rubber composition for lap joint, it is preferred that isoprene rubber and SBR are used in combination. At the same time, in the rubber composition for tread, it is preferred that SBR and BR are used in combination.

[0065] (①) Isoprene rubber Examples of the isoprene-based rubber include natural rubber (NR), isoprene rubber (IR), modified NR, modified NR, and modified IR. NR is preferred because of its excellent strength.

[0066] As NR, for example, materials commonly used in the tire industry such as SVR-L, SIR20, RSS#3, TSR20, etc. can be used. As IR, there is no particular limitation, for example, materials commonly used in the tire industry such as IR2200 manufactured by Japan Zeon Co., Ltd. can be used. As modified NR, deproteinized natural rubber (DPNR), high purity natural rubber (UPNR) and the like can be listed, as modified NR, epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), grafted natural rubber and the like can be listed, as modified IR, epoxidized isoprene rubber, hydrogenated isoprene rubber, grafted isoprene rubber and the like can be listed. These can be used alone or in combination of two or more.

[0067] In the rubber composition for bead apex, the content of isoprene-based rubber in 100 parts by mass of the rubber component is preferably 65 parts by mass or more, more preferably 75 parts by mass or more, and is preferably 95 parts by mass or less, more preferably 85 parts by mass or less.

[0068] Meanwhile, in the rubber composition for a clinch, the content of the isoprene-based rubber in 100 parts by mass of the rubber component is preferably 50 parts by mass or more, more preferably 55 parts by mass or more, and is preferably 70 parts by mass or less, more preferably 65 parts by mass or less.

[0069] Furthermore, the rubber composition for a tread may contain 1 part by mass or more and 45 parts by mass or less of an isoprene-based rubber based on 100 parts by mass of the rubber component, if necessary.

[0070] (②) SBR The weight average molecular weight of SBR is, for example, greater than 100,000 and less than 2,000,000. The styrene content of SBR is, for example, preferably greater than 5 mass %, more preferably greater than 10 mass %, and more preferably greater than 15 mass %. On the other hand, it is preferably less than 40 mass %, more preferably less than 35 mass %, and more preferably less than 30 mass %. The vinyl content (1,2-bonded butadiene unit amount) of SBR is, for example, preferably greater than 5 mass %, more preferably greater than 10 mass %, and more preferably greater than 15 mass %. On the other hand, it is preferably less than 70 mass %, more preferably less than 40 mass %, and more preferably less than 30 mass %. In addition, the structural characterization of SBR (styrene content, determination of vinyl content), for example, can be carried out using the device of JNM-ECA series made by NEPCO.

[0071] As SBR, there is no particular limitation, for example, emulsion polymerization styrene butadiene rubber (E-SBR), solution polymerization styrene butadiene rubber (S-SBR) etc. can be used. SBR can be any one of non-modified SBR and modified SBR. In addition, hydrogenated SBR hydrogenated with the butadiene part in SBR can also be used, and hydrogenated SBR can be obtained by subsequent hydrogenation of the BR part in SBR, and styrene, ethylene, butadiene copolymerization can also be made to obtain the same structure.

[0072] As the modified SBR, preferably there is an SBR having a functional group that interacts with a filler such as silica, and examples thereof include a terminal-modified SBR in which at least one terminal of the SBR is modified with a compound having the above-mentioned functional group (modifier) ​​(terminal-modified SBR having the above-mentioned functional group at the terminal), a main chain-modified SBR having the above-mentioned functional group on the main chain, a main chain terminal-modified SBR having the above-mentioned functional group on the main chain and the terminal (for example, a main chain terminal-modified SBR having the above-mentioned functional group on the main chain and at least one terminal modified with the above-mentioned modifier), and a terminal-modified SBR modified with a polyfunctional compound having two or more epoxy groups in the molecule (coupling agent) to introduce a hydroxyl group or epoxy group.

[0073] Examples of the functional group include amino, amide, silyl, alkoxysilyl, isocyanate, imino, imidazole, urea, ether, carbonyl, oxycarbonyl, mercapto, sulfide, disulfide, sulfonyl, sulfinyl, thiocarbonyl, ammonium, imido, hydrazine, azo, diazo, carboxyl, nitrile, pyridyl, alkoxy, hydroxyl, oxy, and epoxy groups. These functional groups may also have substituents.

[0074] Furthermore, as the modified SBR, for example, SBR modified by a compound (modifying agent) represented by the following formula can be used.

[0075]

Chemical formula 1

[0076] In addition, R 1 , R 2 and R 3 R may be the same or different and represents an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group (-COOH), a mercapto group (-SH), or a derivative thereof. 4 and R 5 R may be the same or different and represents a hydrogen atom or an alkyl group. 4 and R 5 It may also be bonded to form a ring structure together with the nitrogen atom. n represents an integer.

[0077] As the modified SBR modified by the compound (modifier) ​​represented by the above chemical formula, there can be used SBR obtained by modifying the polymerization end (active end) of solution-polymerized styrene butadiene rubber (S-SBR) by the compound represented by the above formula (modified SBR described in JP-A-2010-111753, etc.).

[0078] As R 1 , R 2 and R 3 , preferably an alkoxy group (preferably an alkoxy group having 1 to 8 carbon atoms, more preferably an alkoxy group having 1 to 4 carbon atoms). 4 and R 5 , preferably an alkyl group (preferably an alkyl group having 1 to 3 carbon atoms). n is preferably 1 to 5, more preferably 2 to 4, and further preferably 3. 4 and R 5 When the ring structure is formed by bonding with a nitrogen atom, a 4- to 8-membered ring is preferred. In addition, the alkoxy group also includes a cycloalkoxy group (cyclohexyloxy group, etc.) and an aryloxy group (phenoxy group, benzyloxy group, etc.).

[0079] As the specific example of the above-mentioned modifier, 2-dimethylaminoethyl trimethoxysilane, 3-dimethylaminopropyl trimethoxysilane, 2-dimethylaminoethyl triethoxysilane, 3-dimethylaminopropyl triethoxysilane, 2-diethylaminoethyl trimethoxysilane, 3-diethylaminopropyl trimethoxysilane, 2-diethylaminoethyl triethoxysilane, 3-diethylaminopropyl triethoxysilane, etc. can be listed. These can be used alone or in combination of two or more.

[0080] In addition, as modified SBR, modified SBR modified by the following compounds (modifiers) can also be used. As the modifier, for example, polyglycidyl ethers of polyols such as ethylene glycol diglycidyl ether, glycerol triglycidyl ether, trimethylolethane triglycidyl ether, and trimethylolpropane triglycidyl ether; polyglycidyl ethers of aromatic compounds having two or more phenolic hydroxyl groups such as bisphenol A diglycidyl ether; polyepoxy compounds such as 1,4-diglycidylbenzene, 1,3,5-triglycidylbenzene, and polyepoxidized liquid polybutadiene; tertiary amines containing epoxy groups such as 4,4'-diglycidyl-diphenylmethylamine and 4,4'-diglycidyl-dibenzylmethylamine; diglycidylaniline, N,N'-diglycidylbenzene, and N,N'-diglycidylbenzene; diglycidylamino compounds such as diglycidyl-4-glycidyloxyaniline, diglycidyl o-toluidine, tetraglycidyl m-phenylenediamine, tetraglycidylaminodiphenylmethane, tetraglycidyl p-phenylenediamine, diglycidylaminomethylcyclohexane, tetraglycidyl-1,3-bisaminomethylcyclohexane; acyl chlorides containing amino groups such as bis-(1-methylpropyl)carbamoyl chloride, 4-morpholinecarbonyl chloride, 1-pyrrolidinecarbonyl chloride, N,N-dimethylcarbamoyl chloride, N,N-diethylcarbamoyl chloride; 1,3-bis-(glycidyloxypropyl)-tetramethyldisiloxane, (3-glycidyloxy) Silane compounds containing epoxy groups, such as (trimethylsilyl)-pentamethyldisiloxane; (trimethylsilyl)[3-(trimethoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(triethoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(tripropoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(tributoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(methyldimethoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(methyldiethoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(tripropoxysilyl)propyl] sulfide Silane compounds containing a thioether group, such as (trimethylsilyl) [3-(methyldipropoxysilyl)propyl] sulfide, (trimethylsilyl) [3-(methyldibutoxysilyl)propyl] sulfide; N-substituted aziridine compounds such as ethyleneimine and propyleneimine; alkoxysilanes such as methyltriethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltrimethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltriethoxysilane, N,N-bis(trimethylsilyl)aminoethyltrimethoxysilane, and N,N-bis(trimethylsilyl)aminoethyltriethoxysilane;(thio)benzophenone compounds having an amino group and / or a substituted amino group, such as 4-N,N-dimethylaminobenzophenone, 4-N,N-di-tert-butylaminobenzophenone, 4-N,N-diphenylaminobenzophenone, 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)benzophenone, 4,4'-bis(diphenylamino)benzophenone, and N,N,N',N'-bis-(tetraethylamino)benzophenone; 4-N,N-dimethylaminobenzophenone Benzaldehyde compounds having an amino group and / or a substituted amino group, such as formaldehyde, 4-N,N-diphenylaminobenzaldehyde, and 4-N,N-divinylaminobenzaldehyde; N-substituted pyrrolidones, such as N-methyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-phenyl-2-pyrrolidone, N-tert-butyl-2-pyrrolidone, and N-methyl-5-methyl-2-pyrrolidone; N-methyl-2-piperidone, N-vinyl-2-piperidone, and N-phenyl-2-piperidone; Substituted piperidones; N-methyl-ε-caprolactam, N-phenyl-ε-caprolactam, N-methyl-ω-laurolactam, N-vinyl-ω-laurolactam, N-methyl-β-propiolactam, N-phenyl-β-propiolactam and other N-substituted lactams; in addition, N,N-bis-(2,3-glycidyloxy)-aniline, 4,4-methylene-bis-(N,N-glycidylaniline), tris-(2,3-glycidyl)-1,3,5-triazine-2 ,4,6-triones, N,N-diethylacetamide, N-methylmaleimide, N,N-diethylurea, 1,3-dimethylethyleneurea, 1,3-divinylethyleneurea, 1,3-diethyl-2-imidazolidinone, 1-methyl-3-ethyl-2-imidazolidinone, 4-N,N-dimethylaminoacetophenone, 4-N,N-diethylaminoacetophenone, 1,3-bis(diphenylamino)-2-propanone, 1,7-bis(methylethylamino)-4-heptanone, etc. In addition, the modification based on the above compounds (modifiers) can be implemented by a known method. ;

[0081] As the SBR, for example, SBR manufactured and sold by Sumitomo Chemical Co., Ltd., Innolux Materials Co., Ltd., Asahi Kasei Corporation, Nippon Zeon Co., Ltd., etc. can be used. In addition, the SBR may be used alone or in combination of two or more.

[0082] In the rubber composition for bead apex, the content of SBR in 100 parts by mass of the rubber component is preferably 5 parts by mass or more, more preferably 15 parts by mass or more, and is preferably 35 parts by mass or less, more preferably 25 parts by mass or less.

[0083] Meanwhile, in the rubber composition for a clinch, the content of SBR in 100 parts by mass of the rubber component is preferably 30 parts by mass or more, more preferably 35 parts by mass or more, and on the other hand, is preferably 50 parts by mass or less, more preferably 45 parts by mass or less.

[0084] In addition, in the rubber composition for tread, the content of SBR in 100 parts by mass of the rubber component is preferably 70 parts by mass or more, more preferably 80 parts by mass or more. The upper limit is not particularly limited, but is preferably 95 parts by mass or less, more preferably 90 parts by mass or less.

[0085] (③)BR The weight average molecular weight of BR is, for example, greater than 100,000 and less than 2,000,000. The vinyl content of BR is, for example, greater than 1% by mass and less than 30% by mass. The cis content of BR is, for example, greater than 1% by mass and less than 98% by mass. The trans content of BR is, for example, greater than 1% by mass and less than 60% by mass. In addition, the cis content can be measured by infrared absorption spectroscopy.

[0086] BR is not particularly limited, and BR with a high cis content (a cis content of 90% or more), BR with a low cis content, BR containing syndiotactic polybutadiene crystals, etc. can be used. BR may be either unmodified BR or modified BR, and as modified BR, for example, BR modified by a compound (modifier) ​​represented by the following formula can be used.

[0087]

Chemical formula 2

[0088] In addition, R 1 , R 2 and R 3 R may be the same or different and represents an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group (-COOH), a mercapto group (-SH), or a derivative thereof. 4 and R 5 R may be the same or different and represents a hydrogen atom or an alkyl group. 4 and R 5 It may also be bonded to form a ring structure together with the nitrogen atom. n represents an integer.

[0089] Examples of the modified BR modified with the compound (modifying agent) represented by the above formula include BR in which the polymerization terminal (active terminal) is modified with the compound represented by the above formula.

[0090] As R 1 , R 2 and R 3 , preferably an alkoxy group (preferably an alkoxy group having 1 to 8 carbon atoms, more preferably an alkoxy group having 1 to 4 carbon atoms). 4 and R 5 , preferably an alkyl group (preferably an alkyl group having 1 to 3 carbon atoms). n is preferably 1 to 5, more preferably 2 to 4, and further preferably 3. 4 and R5 When the ring structure is formed by bonding with a nitrogen atom, a 4- to 8-membered ring is preferred. In addition, the alkoxy group also includes a cycloalkoxy group (cyclohexyloxy group, etc.) and an aryloxy group (phenoxy group, benzyloxy group, etc.).

[0091] As the specific example of the above-mentioned modifier, 2-dimethylaminoethyl trimethoxysilane, 3-dimethylaminopropyl trimethoxysilane, 2-dimethylaminoethyl triethoxysilane, 3-dimethylaminopropyl triethoxysilane, 2-diethylaminoethyl trimethoxysilane, 3-diethylaminopropyl trimethoxysilane, 2-diethylaminoethyl triethoxysilane, 3-diethylaminopropyl triethoxysilane, etc. can be listed. These can be used alone or in combination of two or more.

[0092] In addition, as modified BR, modified BR modified by the following compounds (modifiers) can also be used. As the modifier, for example, polyglycidyl ethers of polyhydric alcohols such as ethylene glycol diglycidyl ether, glycerol triglycidyl ether, trimethylolethane triglycidyl ether, and trimethylolpropane triglycidyl ether; polyglycidyl ethers of aromatic compounds having two or more phenolic hydroxyl groups such as bisphenol A diglycidyl ether; polyepoxy compounds such as 1,4-diglycidylbenzene, 1,3,5-triglycidylbenzene, and polyepoxidized liquid polybutadiene; tertiary amines containing epoxy groups such as 4,4'-diglycidyl-diphenylmethylamine and 4,4'-diglycidyl-dibenzylmethylamine; diglycidylaniline, N,N'-diglycidylbenzene, and N,N'-diglycidylbenzene; diglycidylamino compounds such as diglycidyl-4-glycidyloxyaniline, diglycidyl o-toluidine, tetraglycidyl m-phenylenediamine, tetraglycidylaminodiphenylmethane, tetraglycidyl p-phenylenediamine, diglycidylaminomethylcyclohexane, tetraglycidyl-1,3-diaminomethylcyclohexane; acyl chlorides containing amino groups such as bis-(1-methylpropyl)carbamoyl chloride, 4-morpholinecarbonyl chloride, 1-pyrrolidinecarbonyl chloride, N,N-dimethylcarbamoyl chloride, N,N-diethylcarbamoyl chloride; 1,3-bis-(glycidyloxypropyl)-tetramethyldisiloxane, (3-glycidyloxy) Silane compounds containing epoxy groups, such as (trimethylsilyl)-pentamethyldisiloxane; (trimethylsilyl)[3-(trimethoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(triethoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(tripropoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(tributoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(methyldimethoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(methyldiethoxysilyl)propyl] sulfide, (trimethylsilyl)[3-(tripropoxysilyl)propyl] sulfide Silane compounds containing a thioether group, such as (trimethylsilyl) [3-(methyldipropoxysilyl)propyl] sulfide, (trimethylsilyl) [3-(methyldibutoxysilyl)propyl] sulfide; N-substituted aziridine compounds such as ethyleneimine and propyleneimine; alkoxysilanes such as methyltriethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltrimethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltriethoxysilane, N,N-bis(trimethylsilyl)aminoethyltrimethoxysilane, and N,N-bis(trimethylsilyl)aminoethyltriethoxysilane;(thio)benzophenone compounds having an amino group and / or a substituted amino group, such as 4-N,N-dimethylaminobenzophenone, 4-N,N-di-tert-butylaminobenzophenone, 4-N,N-diphenylaminobenzophenone, 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)benzophenone, 4,4'-bis(diphenylamino)benzophenone, and N,N,N',N'-bis-(tetraethylamino)benzophenone; 4-N,N-dimethylaminobenzophenone Benzaldehyde compounds having an amino group and / or a substituted amino group, such as formaldehyde, 4-N,N-diphenylaminobenzaldehyde, and 4-N,N-divinylaminobenzaldehyde; N-substituted pyrrolidones, such as N-methyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-phenyl-2-pyrrolidone, N-tert-butyl-2-pyrrolidone, and N-methyl-5-methyl-2-pyrrolidone; N-methyl-2-piperidone, N-vinyl-2-piperidone, and N-phenyl-2-piperidone; Substituted piperidones; N-methyl-ε-caprolactam, N-phenyl-ε-caprolactam, N-methyl-ω-laurolactam, N-vinyl-ω-laurolactam, N-methyl-β-propiolactam, N-phenyl-β-propiolactam and other N-substituted lactams; in addition, N,N-bis-(2,3-glycidyloxy)-aniline, 4,4-methylene-bis-(N,N-glycidylaniline), tris-(2,3-glycidyl)-1,3,5-triazine-2 ,4,6-triones, N,N-diethylacetamide, N-methylmaleimide, N,N-diethylurea, 1,3-dimethylethyleneurea, 1,3-divinylethyleneurea, 1,3-diethyl-2-imidazolidinone, 1-methyl-3-ethyl-2-imidazolidinone, 4-N,N-dimethylaminoacetphenol, 4-N,N-diethylaminoacetophenone, 1,3-bis(diphenylamino)-2-propanone, 1,7-bis(methylethylamino)-4-heptanone, etc. In addition, the modification by the above-mentioned compounds (modifiers) can be implemented by a known method. In addition, these modified BRs can be used alone or in combination of two or more. ;

[0093] As BR, for example, products of Ube Industries, Inc., Innolux Materials Co., Ltd., Asahi Kasei Corporation, Nippon Zeon Co., Ltd., and the like can be used.

[0094] In the rubber composition for a tread, the content of BR in 100 parts by mass of the rubber component is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and is preferably 25 parts by mass or less, more preferably 20 parts by mass or less.

[0095] Meanwhile, the rubber composition for bead apex and the rubber composition for clinch may contain 1 part by mass or more and less than 10 parts by mass of BR based on 100 parts by mass of the rubber component, as required.

[0096] (④) Other rubber components In the present embodiment, each rubber composition may contain, as other rubber components, a rubber (polymer) commonly used in the production of tires such as nitrile rubber (NBR), if necessary.

[0097] (b) Compounding materials other than rubber components (①) Filler In the present embodiment, each rubber composition preferably contains carbon black, silica, etc. as a reinforcing agent as a filler. In addition, as fillers, in addition to the above-mentioned carbon black and silica, for example, calcium carbonate, talc, alumina, clay, aluminum hydroxide, mica, etc. can also be cited. In addition, when silica is used, it is preferably used in combination with a silane coupling agent.

[0098] In any rubber composition, the total amount of the filler is preferably 40 parts by mass or more, more preferably 50 parts by mass or more, relative to 100 parts by mass of the rubber component. On the other hand, from the viewpoint of dispersibility in the rubber composition, it is preferably 150 parts by mass or less, more preferably 100 parts by mass or less.

[0099] (i) Carbon black The purpose of using carbon black is to improve the crack growth resistance, durability, resistance to ultraviolet degradation, etc. of the tire.

[0100] From the viewpoint of reinforcing rubber, the nitrogen adsorption specific surface area (N2SA) of carbon black is preferably 30 m 2 / g or more, more preferably 50m 2 / g or more, more preferably 60m 2 / g or more. On the other hand, from the viewpoint of heat generation, 250 m 2 / g or less, more preferably 150m 2 / g or less, more preferably 120m 2 / g or less. From the viewpoint of rubber rigidity, the dibutyl phthalate (DBP) absorption of carbon black is, for example, preferably 50 ml / 100 g or more, more preferably 100 ml / 100 g or more. On the other hand, from the viewpoint of followability to rubber deformation, it is preferably 250 ml / 100 g or less, more preferably 150 ml / 100 g or less. In addition, the nitrogen adsorption specific surface area of ​​carbon black is measured according to ASTM D4820-93, and the DBP absorption is measured according to ASTM D2414-93.

[0101] The carbon black is not particularly limited, and examples thereof include furnace blacks such as SAF, ISAF, HAF, MAF, FEF, SRF, GPF, APF, FF, CF, SCF, and ECF; acetylene black; thermal blacks such as FT and MT; channel blacks such as EPC, MPC, and CC, etc. These may be used alone or in combination of two or more.

[0102] In addition to carbon black made from mineral oil or the like as a raw material, carbon black derived from biomass obtained by burning lignin or the like, or recovered carbon black obtained by thermally cracking and refining rubber products containing carbon black such as tires can also be used in appropriate amounts.

[0103] Specific carbon black is not particularly limited, and examples include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, and N762. Commercially available products include, for example, products of Asahi Carbon, Cabot Japan, Tokai Carbon, Mitsubishi Chemical, Lion, Shinjyo Carbon, and Columbia Carbon. These products may be used alone or in combination of two or more.

[0104] In the rubber composition for bead apex, the content of carbon black per 100 parts by mass of the rubber component is, for example, preferably 50 parts by mass or more, more preferably 60 parts by mass or more, and preferably 90 parts by mass or less, more preferably 80 parts by mass or less.

[0105] Meanwhile, in the rubber composition for a clinch, the content of carbon black per 100 parts by mass of the rubber component is preferably 40 parts by mass or more, more preferably 50 parts by mass or more, and on the other hand, is preferably 70 parts by mass or less, more preferably 60 parts by mass or less.

[0106] In the rubber composition for tread, the content of carbon black per 100 parts by mass of the rubber component is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and is preferably 25 parts by mass or less, more preferably 20 parts by mass or less.

[0107] (ii) Silicon dioxide Since silica has no conductivity, it can reduce the dielectric constant when used as a reinforcing material, which can widen the reading range of electronic components. In addition, since the hydrated water contained in silica and the functional groups on the surface can capture ozone, the ozone resistance is improved, which can improve the durability of the tire.

[0108] As for silica, if the average primary particle size is too small, the processability deteriorates, so it is preferred to use silica larger than 8 nm. It is more preferably 9 nm or more, and further preferably 10 nm or more. On the other hand, from the viewpoint of ensuring the reinforcement of rubber and ensuring the handling stability performance on wet roads during driving, it is preferably 25 nm or less, more preferably 20 nm or less, and further preferably 17 nm or less.

[0109] The average primary particle size of silica refers to the average value of the values ​​measured by observing the smallest particle unit of silica constituting the agglomerated structure as a circle and taking the absolute maximum length of the smallest particle as the diameter of the circle. The average primary particle size of silica can be obtained by measuring 400 or more primary particles of silica observed in the field of view through a transmission or scanning electron microscope and averaging the measured values.

[0110] From the viewpoint of obtaining good durability, the BET specific surface area of ​​silica is preferably greater than 100 m 2 / g, more preferably greater than 130m 2 / g. On the other hand, it is preferably less than 250m 2 / g, more preferably less than 200m 2 / g. The above-mentioned BET specific surface area is a value of N2SA measured by the BET method according to ASTM D3037-93.

[0111] As silicon dioxide, for example, dry silicon dioxide (anhydrous silicon dioxide), wet silicon dioxide (hydrous silicon dioxide), colloidal silicon dioxide, etc. can be cited. Among them, wet silicon dioxide containing water and water and a large amount of silanol groups, which can efficiently capture ozone, is preferred. In addition, silicon dioxide using water-containing glass as a raw material, silicon dioxide using biomass materials such as rice husks as a raw material, etc. can also be used.

[0112] As the silica, products of Evonik Industries, Rhodia, Tosoh Silicon Chemicals, Solvay Japan, Tokuyama Co., Ltd., and the like can be used.

[0113] In the rubber composition for tread, the content of silica relative to 100 parts by mass of the rubber component is preferably 40 parts by mass or more, more preferably 50 parts by mass or more, and on the other hand, from the viewpoint of dispersibility in the rubber composition, preferably 110 parts by mass or less, more preferably 100 parts by mass or less.

[0114] At the same time, the rubber composition for bead apex rubber and the rubber composition for lap joint may also contain silica as needed. In this case, considering sufficient extrusion processability and ozone resistance, the content of silica relative to 100 parts by mass of the rubber component is, for example, preferably 5 parts by mass or more, more preferably 10 parts by mass or more. In addition, it is preferably 20 parts by mass or less, more preferably 15 parts by mass or less. By setting such a silica amount, sufficient extrusion processability and ozone resistance can be obtained.

[0115] (iii) Silane coupling agent When silica is used as a filler, it is preferred to use a silane coupling agent in combination in order to improve the dispersibility of silica and to improve mechanical properties and moldability by reaction with silica.

[0116] 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)tetrasulfide, silylbutyl) 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-dimethyl Sulfide-based silanes such as 2-triethoxysilylethyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-triethoxysilyl methacrylate propyl monosulfide, 3-mercaptopropyl trimethoxysilane, 2-mercaptoethyl triethoxysilane, and NXT and NXT-Z manufactured by Momentive, vinyl-based silanes such as vinyl triethoxysilane and vinyl trimethoxysilane, 3-aminopropyl trimethoxysilane, 2-mercaptoethyl triethoxysilane, and NXT manufactured by Momentive, and 3-mercaptopropyl trimethoxysilane. Amino-based silanes such as ethoxysilane and 3-aminopropyltrimethoxysilane, glycidoxy-based silanes such as γ-glycidoxypropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane, nitro-based silanes such as 3-nitropropyltrimethoxysilane and 3-nitropropyltriethoxysilane, chlorinated silanes such as 3-chloropropyltrimethoxysilane and 3-chloropropyltriethoxysilane, etc., among which silane coupling agents having a thiocarbonyl group such as the above-mentioned NXT are preferred. These may be used alone or in combination of two or more.

[0117] As the silane coupling agent, for example, products of Evonik Industries, Momentive, Shin-Etsu Silicone, Tokyo Chemical Industry, Azmax, Dow Corning Toray, etc. can be used.

[0118] The content of the silane coupling agent is, for example, preferably greater than 3 parts by mass, more preferably 5 parts by mass or more, and preferably less than 15 parts by mass, more preferably 10 parts by mass or less, based on 100 parts by mass of silica.

[0119] (iv) Other fillers Each rubber composition may further contain fillers commonly used in the tire industry, such as graphite, calcium carbonate, talc, alumina, clay, aluminum hydroxide, mica, magnesium sulfate, etc., in addition to the above-mentioned carbon black and silica. The content of these fillers is, for example, greater than 0.1 parts by mass and less than 150 parts by mass relative to 100 parts by mass of the rubber component.

[0120] (②) Plasticizer ingredients In each rubber composition, it is preferred to use a plasticizer component as needed in consideration of proper dispersion of the powder material during kneading. In addition, the plasticizer component here refers to a substance that plasticizes the rubber composition, such as process oil or extender oil of the rubber component, liquid rubber, and resin component.

[0121] In this case, in each rubber composition, the content of the plasticizer component per 100 parts by mass of the rubber component is preferably 2 parts by mass or more, more preferably 5 parts by mass or more, and is preferably 20 parts by mass or less, more preferably 15 parts by mass or less.

[0122] In addition, the content of the plasticizer also includes the amount of oil contained in the rubber (oil-extended rubber) or the like.

[0123] (i)Oil Examples of the oil include mineral oil, synthetic oil, vegetable oil, animal oil, and mixtures thereof.

[0124] As the mineral oil, for example, paraffinic, aromatic, naphthenic and other oils can be cited, and for example, products of Idemitsu Kosan Co., Ltd., Sankyo Yuka Kogyo Co., Ltd., Innolux Co., Ltd., Olisoy Co., Ltd., H&R Co., Ltd., Toyokuni Oil Manufacturing Co., Ltd., Showa Shell Sekiyu Co., Ltd., Fuji Kosan Co., Ltd., etc. can be used. These can be used alone or in combination of two or more.

[0125] Furthermore, from the viewpoint of life cycle assessment, lubricating oils used for mixers of rubber mixers, engines, etc., or waste cooking oils used in restaurants, etc. may be appropriately purified and used as these oils.

[0126] Examples of the vegetable oil include linseed oil, rapeseed oil, safflower oil, soybean oil, corn oil, cottonseed oil, rice bran oil, tall oil, sesame oil, perilla seed oil, castor seed oil, tung oil, pine oil, pine tar, sunflower seed oil, coconut oil, palm oil, palm kernel oil, olive oil, tea oil, jojoba oil, macadamia nut oil, peanut oil, grape seed oil, and wood wax.

[0127] Furthermore, examples of vegetable oils include refined oils (salad oils, etc.) obtained by refining the above-mentioned oils, esterified oils obtained by transesterification, solidified oils obtained by hydrogenation, thermally polymerized oils obtained by thermal polymerization, oxidatively polymerized oils obtained by oxidation, edible oils, and waste edible oils obtained by recovering used oils. Vegetable oils may be either liquid or solid at room temperature (25° C.). These may be used alone or in combination of two or more.

[0128] As vegetable oil, acylglycerol is preferred, and triacylglycerol is more preferred. In addition, acylglycerol refers to a compound in which a hydroxyl group of glycerol forms an ester bond with a carboxylic acid. As acylglycerol, there is no particular limitation, and it can be 1-monoacylglycerol, 2-monoacylglycerol, 1,2-diacylglycerol, 1,3-diacylglycerol, or triacylglycerol. Furthermore, acylglycerol can be a monomer, a dimer, or a polymer of a trimer or more. In addition, acylglycerols of dimers or more can be obtained by thermal polymerization, oxidative polymerization, etc. In addition, acylglycerols can be liquid or solid at room temperature (25°C).

[0129] The method for confirming whether or not the rubber composition contains acylglycerols is not particularly limited, and the method can be performed by 1 H-NMR measurement confirmation. For example, a rubber composition containing triacylglycerol is immersed in deuterated chloroform at room temperature (25°C) for 24 hours, and after removing the rubber composition, the rubber composition is measured at room temperature. 1 H-NMR, when the signal of tetramethylsilane (TMS) is set to 0.00ppm, signals near 5.26ppm, near 4.28ppm, and near 4.15ppm are observed, and it is estimated that these signals are signals from hydrogen atoms bonded to carbon atoms adjacent to the oxygen atom of the ester group, and it can be confirmed that acylglycerol is contained. In addition, "nearby" here means the range of ±0.10ppm.

[0130] The carboxylic acid is not particularly limited and may be an unsaturated fatty acid or a saturated fatty acid. Examples of the unsaturated fatty acid include monounsaturated fatty acids such as oleic acid and polyunsaturated fatty acids such as linoleic acid and linolenic acid.

[0131] As the vegetable oil, for example, products commercially available from Idemitsu Kosan, Sankyo Yuka Kogyo, Innolux, Olisoy, H&R, Toyokuni Oil Manufacturing, Fuji Kosan, and Nissin Oillio Group Corporation can be used.

[0132] (ii) Liquid rubber Liquid rubber refers to a polymer that is in a liquid state at room temperature (25° C.) and is a rubber component that can be extracted from a vulcanized tire by acetone extraction. Examples of liquid rubber include farnesene polymers, liquid diene polymers, and hydrogenated products thereof.

[0133] Farnesene polymers are polymers obtained by polymerizing farnesene, and have structural units based on farnesene. Farnesene includes isomers such as α-farnesene ((3E,7E)-3,7,11-trimethyl-1,3,6,10-dodecatetraene) and β-farnesene (7,11-dimethyl-3-methylene-1,6,10-dodecatriene).

[0134] The farnesene polymer may be a homopolymer of farnesene (farnesene homopolymer) or a copolymer of farnesene and a vinyl monomer (farnesene-vinyl monomer copolymer).

[0135] Examples of the liquid diene polymer include liquid styrene butadiene copolymers (liquid SBR), liquid butadiene polymers (liquid BR), liquid isoprene polymers (liquid IR), and liquid styrene isoprene copolymers (liquid SIR).

[0136] The weight average molecular weight (Mw) of the liquid diene polymer measured by gel permeation chromatography (GPC) in terms of polystyrene is, for example, greater than 1.0×10 3 , less than 2.0×10 5 Here, the Mw of the liquid diene polymer is a value measured by gel permeation chromatography (GPC) in terms of polystyrene.

[0137] In each rubber composition, the content of the liquid rubber (the total content of the liquid farnesene polymer, the liquid diene polymer, etc.) is preferably, for example, greater than 1 part by mass and less than 100 parts by mass based on 100 parts by mass of the rubber component.

[0138] As the liquid rubber, for example, products of Kuraray Co., Ltd., Clayville Co., Ltd., or the like can be used.

[0139] (iii) Resin component The resin component also functions as an adhesiveness-imparting component, and may be solid or liquid at room temperature. Specific examples of the resin component include rosin resins, styrene resins, coumarone resins, terpene resins, C5 resins, C9 resins, C5C9 resins, acrylic resins, and the like, and two or more kinds may be used in combination. In each rubber composition, the content of the resin component is greater than 2 parts by mass, preferably less than 45 parts by mass, and more preferably less than 30 parts by mass, relative to 100 parts by mass of the rubber component.

[0140] Rosin resin is a resin with rosin acid obtained by processing rosin as the main component. The rosin resin (rosin) can be classified according to whether it is modified or not, and can be classified into unmodified rosin (unmodified rosin) and rosin modified body (rosin derivative). As unmodified rosin, tall rosin (another name: tall oil rosin), gum rosin, wood rosin, disproportionated rosin, polymerized rosin, hydrogenated rosin, other chemically modified rosins, etc. can be listed. Rosin modified body is a modified body of unmodified rosin, and rosin esters, unsaturated carboxylic acid modified rosins, unsaturated carboxylic acid modified rosin esters, rosin amide compounds, rosin amine salts, etc. can be listed.

[0141] Styrene resins are polymers using styrene monomers as constituent monomers, and examples include polymers polymerized with styrene monomers as the main component (50% by mass or more). Specifically, examples include homopolymers obtained by homopolymerizing styrene monomers (styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, α-methylstyrene, p-methoxystyrene, p-tert-butylstyrene, p-phenylstyrene, o-chlorostyrene, m-chlorostyrene, p-chlorostyrene, etc.), copolymers obtained by copolymerizing two or more styrene monomers, and copolymers of styrene monomers and other monomers copolymerizable therewith.

[0142] Examples of the other monomers include acrylonitriles such as acrylonitrile and methacrylonitrile, unsaturated carboxylic acids such as acrylic acid and methacrylic acid, unsaturated carboxylic acid esters such as methyl acrylate and methyl methacrylate, dienes such as chloroprene, butadiene and isoprene, olefins such as 1-butene and 1-pentene; α,β-unsaturated carboxylic acids such as maleic anhydride or their anhydrides, etc.

[0143] Among the coumarone resins, coumarone indene resin is preferred. The coumarone indene resin is a resin containing coumarone and indene as monomer components constituting the resin skeleton (main chain). Examples of monomer components contained in the skeleton other than coumarone and indene include styrene, α-methylstyrene, methylindene, vinyltoluene, and the like.

[0144] In each rubber composition, the content of the coumarone indene resin is preferably, for example, greater than 1.0 part by mass and less than 50.0 parts by mass relative to 100 parts by mass of the rubber component.

[0145] The hydroxyl value (OH value) of the coumarone indene resin is, for example, greater than 15 mgKOH / g and less than 150 mgKOH / g. The OH value refers to the value expressed in milligrams of the amount of potassium hydroxide required to neutralize acetic acid bonded to the hydroxyl group when 1 g of the resin is acetylated, and is a value measured by potentiometric titration (JIS K 0070: 1992).

[0146] The softening point of the coumarone indene resin is, for example, higher than 30° C. and lower than 160° C. The softening point is the temperature at which the ball falls when measured with a ring and ball softening point measuring apparatus as specified in JIS K 6220-1:2001.

[0147] Examples of terpene resins include polyterpene, terpene phenol, and aromatic modified terpene resins. Polyterpene is a resin obtained by polymerizing terpene compounds and their hydrogenated products. Terpene compounds are obtained by using (C5H8) n The hydrocarbons and their oxygenated derivatives are classified as monoterpenes (C 10 H 16 ), sesquiterpenes (C 15 H 24 ), diterpenes (C 20 H 32 ) and the like as a basic skeleton, for example, α-pinene, β-pinene, dipentene, limonene, myrcene, alloocimene, ocimene, α-phellandrene, α-terpinene, γ-terpinene, terpinolene, 1,8-cineole, 1,4-cineole, α-terpineol, β-terpineol, γ-terpineol, etc. can be listed.

[0148] As polyterpenes, in addition to terpene resins such as α-pinene resin, β-pinene resin, limonene resin, dipentene resin, β-pinene / limonene resin, etc., which use the above-mentioned terpene compounds as raw materials, hydrogenated terpene resins can also be listed. As terpene phenols, resins obtained by copolymerizing the above-mentioned terpene compounds with phenolic compounds and resins obtained by hydrogenating the resins can be listed. Specifically, resins obtained by condensing the above-mentioned terpene compounds, phenolic compounds and formalin can be listed. In addition, as phenolic compounds, for example, phenol, bisphenol A, cresol, xylenol, etc. can be listed. As aromatic modified terpene resins, resins obtained by modifying terpene resins with aromatic compounds and resins obtained by hydrogenating the resins can be listed. In addition, the aromatic compound is not particularly limited as long as it is a compound having an aromatic ring, and examples thereof include phenol compounds such as phenol, alkylphenol, alkoxyphenol, and phenol containing an unsaturated hydrocarbon group; naphthol compounds such as naphthol, alkylnaphthol, alkoxynaphthol, and naphthol containing an unsaturated hydrocarbon group; styrene derivatives such as styrene, alkylstyrene, alkoxystyrene, and styrene containing an unsaturated hydrocarbon group; coumarone, indene, etc.

[0149] "C5 resin" refers to a resin obtained by polymerizing a C5 fraction. Examples of the C5 fraction include petroleum fractions having 4 to 5 carbon atoms, such as cyclopentadiene, pentene, pentadiene, and isoprene. As the C5 petroleum resin, dicyclopentadiene resin (DCPD resin) is preferably used.

[0150] "C9 resin" refers to a resin obtained by polymerizing a C9 fraction, and may also be a hydrogenated product or a modified product thereof. As the C9 fraction, for example, petroleum fractions having 8 to 10 carbon atoms, such as vinyltoluene, alkylstyrene, indene, and methylindene, may be cited. As a specific example, for example, coumarone indene resin, coumarone resin, indene resin, and aromatic vinyl resin are preferably used. As the aromatic vinyl resin, for reasons of economy, easy processing, and excellent heat generation, α-methylstyrene (AMS resin), a homopolymer of styrene, or a copolymer of α-methylstyrene and styrene is preferred, and a copolymer of α-methylstyrene and styrene is more preferred. As the aromatic vinyl resin, for example, commercially available products from Kraton, Eastman Chemical, etc. may be used.

[0151] "C5C9 resin" refers to a resin obtained by copolymerizing the above-mentioned C5 fraction and the above-mentioned C9 fraction, and may also be a hydrogenated product or a modified product thereof. Examples of the C5 fraction and the C9 fraction include the above-mentioned petroleum fractions. As the C5C9 resin, for example, commercially available materials such as those sold by Tosoh Corporation and LUHUA Corporation may be used.

[0152] The acrylic resin is not particularly limited, and for example, a solvent-free acrylic resin can be used.

[0153] Solvent-free acrylic resins include (meth)acrylic resins (polymers) synthesized by a high-temperature continuous polymerization method (high-temperature continuous bulk polymerization method) (methods described in U.S. Patent No. 4,414,370, Japanese Patent Laid-Open No. 59-6207, Japanese Patent No. 5-58005, Japanese Patent Laid-Open No. 1-313522, U.S. Patent No. 5,010,166, East Asia Synthesis Research Annual Report TREND 2000 No. 3, p. 42-45, etc.) without using a polymerization initiator, a chain transfer agent, an organic solvent, etc. as secondary raw materials as much as possible. In addition, in the present invention, (meth)acrylic acid means methacrylic acid and acrylic acid.

[0154] Examples of the monomer components constituting the acrylic resin include (meth)acrylic acid, (meth)acrylic acid esters (alkyl esters, aryl esters, arylalkyl esters, etc.), (meth)acrylamide, and (meth)acrylic acid derivatives such as (meth)acrylamide derivatives.

[0155] Furthermore, as the monomer component constituting the acrylic resin, an aromatic vinyl such as styrene, α-methylstyrene, vinyltoluene, vinylnaphthalene, divinylbenzene, trivinylbenzene, and divinylnaphthalene may be used together with (meth)acrylic acid and (meth)acrylic acid derivatives.

[0156] The acrylic resin may be a resin composed only of a (meth)acrylic acid component, or may be a resin containing components other than the (meth)acrylic acid component as constituent elements. In addition, the acrylic resin may have a hydroxyl group, a carboxyl group, a silanol group, or the like.

[0157] As the resin component, for example, products of Maruzen Petrochemical Co., Ltd., Sumitomo Bakelite Co., Ltd., Yasuhara Chemical Co., Ltd., Tosoh Corporation, Rutgers Chemicals Co., Ltd., BASF Corporation, Kraton Corporation, Nippon Coating Chemical Co., Ltd., Nippon Shokubai Co., Ltd., Innolux Corporation, Arakawa Chemical Industries, Ltd., Taoka Chemical Industries, Ltd., etc. can be used.

[0158] (③) Curable resin component Each rubber composition is preferably selected according to the need to suppress E * , and contains a curable resin component such as a modified resorcinol resin or a modified phenol resin as a heat resistance improving agent.

[0159] Specific examples of modified resorcinol resins include SUMIKANOL 620 (modified resorcinol resin) manufactured by Taoka Chemical Industry Co., Ltd., and examples of modified phenol resins include PR12686 (cashew nut oil-modified phenol resin) manufactured by Sumitomo Bakelite Co., Ltd.

[0160] The content of the curable resin component is preferably 1 part by mass or more, more preferably 2 parts by mass or more, relative to 100 parts by mass of the rubber component, for example, from the viewpoint of sufficiently improving the complex elastic modulus and obtaining a large reaction force during deformation. On the other hand, from the viewpoint of maintaining the breaking strength, it is preferably 10 parts by mass or less, more preferably 8 parts by mass or less.

[0161] When using modified resorcinol resin, as curing agent, preferably contain methylene donor simultaneously.As methylene donor, for example, hexamethylenetetramine (HMT), hexamethoxymethyl melamine (HMMM), hexamethylol melamine pentamethyl ether (HMMPME) etc. can be listed, relative to curable resin component 100 mass parts, for example, contain more than 5 mass parts, preferably contain about 15 mass parts.When too little, then may not obtain sufficient complex elastic modulus.On the other hand, when too much, then the viscosity of rubber increases, processability may deteriorate.

[0162] As a specific methylene donor, for example, SUMIKANOL 507 manufactured by Taoka Chemical Industry Co., Ltd. can be used.

[0163] (④) Lubricant (stearic acid) Each rubber composition may also contain a lubricant. As the lubricant, a lubricant based on a derivative of a fatty acid such as stearic acid can be preferably used. As stearic acid, a conventionally known substance can be used, specifically, for example, products of NOF Corporation, NOF Corporation, Kao Corporation, Fujifilm Wako Pure Chemical Industries, Ltd., Chiba Fatty Acid Co., Ltd., etc. can be used. In addition, STRUKTOL WB16 manufactured by STRUKTOL Corporation, etc. can also be used.

[0164] The content of stearic acid is preferably, for example, greater than 0.5 parts by mass and less than 10.0 parts by mass relative to 100 parts by mass of the rubber component.

[0165] (⑤) Anti-aging agent Each rubber composition may contain an antioxidant. The content of the antioxidant is, for example, greater than 1 part by mass and less than 10 parts by mass relative to 100 parts by mass of the rubber component.

[0166] As antioxidants, for example, naphthylamine antioxidants such as phenyl-α-naphthylamine; diphenylamine antioxidants such as octylated diphenylamine and 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine; p-phenylenediamine antioxidants such as N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine and N,N'-di-2-naphthyl-p-phenylenediamine; quinoline antioxidants such as polymers of 2,2,4-trimethyl-1,2-dihydroquinoline; monophenol antioxidants such as 2,6-di-tert-butyl-4-methylphenol and styrenated phenol; di-, tri- and polyphenol antioxidants such as tetrakis-[methylene-3-(3,5'-di-tert-butyl-4'-hydroxyphenyl)propionate]methane, etc. These can be used alone or in combination of two or more.

[0167] As specific antioxidants, for example, products of Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Co., Ltd., Flexis Co., Ltd., and the like can be used.

[0168] (⑥) Zinc oxide Each rubber composition may also contain zinc oxide. The content of zinc oxide is, for example, greater than 0.5 parts by mass and less than 10 parts by mass relative to 100 parts by mass of the rubber component. As zinc oxide, conventionally known substances can be used, for example, products of Mitsui Mining and Smelting Co., Ltd., Toho Asia Lead Co., Ltd., Shirasu Techno Co., Ltd., Shodo Chemical Industry Co., Ltd., Sakai Chemical Industry Co., Ltd., etc. can be used.

[0169] (⑦) Wax Each rubber composition may contain wax. The content of the wax is, for example, preferably 0.5 to 20 parts by mass, more preferably 1.0 to 15 parts by mass, and even more preferably 1.5 to 10 parts by mass, relative to 100 parts by mass of the rubber component.

[0170] The wax is not particularly limited, and examples thereof include petroleum waxes such as paraffin wax and microcrystalline wax, natural waxes such as plant wax and animal wax, and synthetic waxes such as polymers of ethylene and propylene, etc. These may be used alone or in combination of two or more.

[0171] In addition, as the wax, for example, products of Ouchi Shinko Chemical Industry Co., Ltd., Nippon Seiro Co., Ltd., Seiko Chemical Co., Ltd., etc. can be used.

[0172] (⑧) Cross-linking agent and vulcanization accelerator Each rubber composition preferably contains a crosslinking agent such as sulfur. The content of the crosslinking agent is, for example, greater than 0.1 parts by mass and less than 10.0 parts by mass relative to 100 parts by mass of the rubber component. In addition, the content of sulfur refers to the pure sulfur content, and when insoluble sulfur is used, it refers to the content excluding the oil content.

[0173] Examples of sulfur include powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, and soluble sulfur commonly used in the rubber industry. These may be used alone or in combination of two or more.

[0174] As sulfur, for example, products of Tsurumi Chemical Industry Co., Ltd., Karuizawa Sulfur Co., Ltd., Shikoku Chemical Industry Co., Ltd., Flexis Co., Ltd., Nippon Kanryu Kogyo Co., Ltd., Hosoi Chemical Industry Co., Ltd., and the like can be used.

[0175] Cross-linking agents other than sulfur may also be used. Specifically, for example, sulfur-containing vulcanizing agents such as TACKIROL V200 manufactured by Taoka Chemical Industry Co., Ltd., DURALINK HTS (1,6-sodium hexamethylene dithiosulfate dihydrate) manufactured by Flexis, and KA9188 (1,6-bis(N,N-dibenzylthiocarbamoyl disulfide) hexane: hybrid crosslinker) manufactured by LANXESS, and organic peroxides such as diisopropylbenzene peroxide may be used.

[0176] Each rubber composition preferably contains a vulcanization accelerator. The content of the vulcanization accelerator is, for example, greater than 0.3 parts by mass and less than 10.0 parts by mass relative to 100 parts by mass of the rubber component.

[0177] Examples of the vulcanization accelerator include thiazole-based vulcanization accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazole disulfide, and N-cyclohexyl-2-benzothiazole sulfenamide; thiuram-based vulcanization accelerators such as tetramethylthiuram disulfide (TMTD), tetrabenzylthiuram disulfide (TBzTD), and tetrakis(2-ethylhexyl)thiuram disulfide (TOT-N); sulfenamide-based vulcanization accelerators such as N-cyclohexyl-2-benzothiazole sulfenamide, N-tert-butyl-2-benzothiazole sulfenamide, N-oxyethylene-2-benzothiazole sulfenamide, and N,N'-diisopropyl-2-benzothiazole sulfenamide; and guanidine-based vulcanization accelerators such as diphenylguanidine, di-o-tolylguanidine, and o-tolylbiguanide. These may be used alone or in combination of two or more.

[0178] (⑨) Others In addition to the above-mentioned components, each rubber composition may also contain additives commonly used in the tire industry, such as organic fillers such as cellulose fibers, organic peroxides, etc. The content of these additives is, for example, greater than 0.1 parts by mass and less than 50 parts by mass relative to 100 parts by mass of the rubber component.

[0179] In each rubber composition, the loss tangent (tan δ) can be adjusted by adjusting the amount of carbon black, sulfur, and the like, thereby achieving a desired loss tangent (tan δ) without excessive trial and error.

[0180] At the same time, the complex elastic modulus (E * ) can be adjusted by adjusting the amount of curable resin component. In addition, by adjusting the amount of carbon black and sulfur, the complex elastic modulus (E * Specifically, by increasing the amount of carbon black and sulfur, the complex elastic modulus (E * ). If the amount of carbon black is increased, the heat generation increases, and if the amount of sulfur is increased, the heat generation decreases. Therefore, it is preferable to first determine whether to use a curable resin component and the blending amount, then adjust the amount of sulfur, and finally adjust the amount of carbon black. In this way, the desired complex elastic modulus (E * ).

[0181] (2) Preparation of each rubber composition Each rubber composition can be produced by a conventional method, for example, a method comprising a basic kneading step of kneading a rubber component with a filler such as carbon black, and a finishing kneading step of kneading the kneaded product obtained in the basic kneading step with a crosslinking agent.

[0182] Kneading can be performed using a known (closed type) kneading machine such as a Banbury mixer, a kneader, or an open roll mill.

[0183] The kneading temperature of the basic kneading step is, for example, greater than 50° C. and less than 200° C., and the kneading time is, for example, greater than 30 seconds and less than 30 minutes. In the basic kneading step, in addition to the above-mentioned components, compounding agents conventionally used in the rubber industry, for example, softeners such as oil, stearic acid, zinc oxide, antioxidants, waxes, vulcanization accelerators, etc., may be appropriately added and kneaded as needed.

[0184] In the refining and kneading step, the kneaded product obtained in the basic kneading step is kneaded with a crosslinking agent. The kneading temperature in the refining and kneading step is, for example, greater than room temperature and less than 80° C., and the kneading time is, for example, greater than 1 minute and less than 15 minutes. In the refining and kneading step, in addition to the above-mentioned components, a vulcanization accelerator, zinc oxide, etc. may be appropriately added and kneaded as needed.

[0185] The rubber composition for bead apex, the rubber composition for clinch, and the rubber composition for tread obtained as described above can be processed into a predetermined shape by extrusion thereafter, and molded into a bead apex, a clinch, and a tread, respectively.

[0186] 3. Tire manufacturing The tire of this embodiment can be manufactured by conventional methods except that electronic components are embedded in the molding process. First, the rubber compositions obtained by the above are molded into a predetermined shape to manufacture bead apex rubber, lap joint, and tread. Then, they are combined with other rubber components on a tire molding machine to manufacture an unvulcanized tire.

[0187] Specifically, an inner liner as a component for ensuring the airtightness of the tire, a carcass as a component for withstanding the load, impact, and air pressure of the tire, and a belt component as a component for strongly fastening the carcass and improving the rigidity of the tread are wound on a forming drum, and both ends of the carcass are fixed to the edge portions on both sides, and a bead portion is arranged as a component for fixing the tire to the rim, and after being formed into a ring shape, the tread is attached to the central portion of the outer circumference, and the sidewall is attached to the radially outer side to form the sidewall portion, thereby manufacturing an unvulcanized tire. In this unvulcanized tire manufacturing process, electronic components are embedded in a predetermined position.

[0188] Then, the unvulcanized tire prepared in the above-mentioned manner is heated and pressurized in a vulcanizer to obtain a tire. The vulcanization step can be implemented by applying a known vulcanization method. The vulcanization temperature is, for example, greater than 120° C. and less than 200° C., and the vulcanization time is, for example, greater than 5 minutes and less than 15 minutes.

[0189] As described above, the tire obtained by the above-mentioned method has an electronic component arranged between the bead apex rubber and the carcass layer, which reduces the deformation around the electronic component during driving and suppresses the peeling and damage of the electronic component in the tire. At the same time, since the product of the loss tangent of the bead apex rubber and the circumferential length of the electronic component in the tire is controlled to be below a certain value, the heating of the bead apex rubber and the peeling of the electronic component in the tire can be fully suppressed, thereby improving the durability of the tire equipped with electronic components during driving.

[0190] At the same time, the tires involved in the present invention can be preferably used for passenger car tires, large passenger car tires, large SUV tires, truck / bus tires, two-wheeled vehicle tires, racing tires, studless tires (winter tires), all-season tires, run-flat tires, etc., and are especially preferably used as passenger car tires. [Example]

[0191] Examples (embodiments) considered to be preferable in practice are shown below, but the scope of the present invention is not limited to these examples.

[0192] Tires consisting of the following components (tire sizes 205 / 55R16 (Study 1), 195 / 65R15 (Study 2), 155 / 60R16 (Study 3)) were studied, and the results are shown in Tables 4 to 9: bead apex, clinch, tread and other rubber components formed from the rubber compositions for bead apex, clinch and tread based on the various compounding materials shown below and the rubber compositions for bead apex, clinch and tread of Tables 1 to 3.

[0193] 1. Preparation of each rubber composition A rubber composition for a bead apex, a rubber composition for a clinch, and a rubber composition for a tread were prepared using the various compounding materials shown below.

[0194] (1) Compounding materials (a) Rubber component (①)NR:TSR20 (②) SBR: SBR1502 manufactured by Innolux Materials Co., Ltd. (Styrene content: 23.5% by mass, vinyl bond content: 16% by mass, non-oil-extended) (③) BR: UBEPOL BR150B (high-cis BR) manufactured by Ube Industries (Mw: 440,000, cis-1,4 bond content: 96 mass %)

[0195] (b) Compounding materials other than rubber components (①) Carbon black: DIABLACK N330 manufactured by Mitsubishi Chemical Corporation (Average particle size: 31nm, CTAB: 78nm 2 / g, N2SA: 79m 2 / g) (②) Silica: ULTRASIL VN3 manufactured by Evonik Industries (N2SA: 175m 2 / g, average primary particle size: 17nm) (③) Silane coupling agent: Si266 manufactured by Evonik Industries (Bis(3-triethoxysilylpropyl) disulfide) (④) Oil: VivaTec 500 (TDAE oil) manufactured by H&R (⑤) Thermosetting resin: PR12686 manufactured by Sumitomo Bakelite Co., Ltd. (Cashew nut oil modified phenol resin) (⑥) Resin: PETROTACK 100V manufactured by Tosoh Corporation (C5C9 series petroleum resin, softening point 96℃) (⑦) Stearic acid: Tsubaki stearic acid beads made by NOF Corporation (⑧) Antioxidant-1: NOCRAC 6C manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine) (⑨) Antioxidant-2: NOCRAC RD manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (Poly(2,2,4-trimethyl-1,2-dihydroquinoline))) (⑩) Zinc oxide: Zinc oxide No. 2 manufactured by Mitsui Mining & Smelting Co., Ltd. Sulfur: Powdered sulfur manufactured by Karuizawa Sulfur Co., Ltd. Accelerator: NOCRAC-NS manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (N-tert-Butyl-2-benzothiazolesulfenamide (TBBS)) Curing agent: SUMIKANOL 507 manufactured by Taoka Chemical Industry Co., Ltd.

[0196] (2) Preparation of rubber composition for bead apex rubber According to the compounding contents shown in Table 1, materials other than sulfur and the vulcanization accelerator were kneaded at 150° C. for 5 minutes using a Banbury mixer to obtain a kneaded product. In addition, each compounding amount is parts by mass.

[0197] Then, sulfur and a vulcanization accelerator were added to the kneaded product, and the mixture was kneaded at 80° C. for 5 minutes using an open roll mill to obtain rubber compositions for bead apex of BA-1 to BA-8.

[0198]

Table 1

[0199] (3) Preparation of rubber composition for clinch At the same time, based on the respective compoundings shown in Table 2, rubber compositions for clinch portions CA-1 to CA-4 were obtained in the same manner as in the preparation of the rubber composition for bead apex.

[0200]

Table 2

[0201] (4) Preparation of rubber composition for tread Simultaneously, based on the respective blends shown in Table 3, rubber compositions for treads TR-1 to TR-3 were obtained in the same manner as in the preparation of the rubber composition for bead apex.

[0202]

Table 3

[0203] 2. Forming of bead apex, lap joint and tread Then, each rubber composition obtained as described above was used to form a bead apex, a clinch portion, and a tread into a predetermined shape.

[0204] In addition, among the physical properties recorded in Tables 1 to 3, tanδ at 70°C, tanδ at 30°C, and tanδ at 0°C are measured by using "EPLEXOR (registered trademark)" manufactured by GABO, at a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, and at temperatures of 70°C, 30°C, and 0°C, respectively, under the conditions of deformation mode: tension.

[0205] In addition, 70℃E * The test pieces prepared in the same manner were measured using "EPLEXOR (registered trademark)" manufactured by GABO Corporation under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, dynamic strain rate 1%, and deformation mode: tension.

[0206] In addition, when making the test piece, take the test piece whose length direction is consistent with the circumferential direction. Furthermore, the thickness direction of the test piece is set to be consistent with the radial direction of the tire in the tread, and consistent with the width direction of the tire in the bead apex and overlap. In addition, when the thickness of each component is less than 1mm, collect the test piece of the thickest part of the component on the equatorial plane of the tire and a certain thickness. For example, when the thickness on the equatorial plane of the tire is 0.5mm, use a test piece of 20mm long×4mm wide×0.5mm thick for measurement.

[0207] 3. Tire manufacturing Then, the bead apex rubber, overlap portion, and tread obtained above were bonded together with other tire components according to the combinations shown in Tables 4 to 9 to form an unvulcanized tire, and pressurized and vulcanized at 170° C. for 10 minutes to manufacture the test tires shown in Tables 4 to 9.

[0208] Furthermore, when the unvulcanized tire is formed, an electronic component (RFID) having the dimensions (weight W (g), tire circumferential length L (mm), and longitudinal length (mm)) shown in Tables 4 to 9 is embedded at the embedding position shown in Tables 4 to 9. At this time, a plating layer containing copper and nickel is formed in advance on the surface of the electronic component, and a rubber coating layer having a thickness of 0.5 mm is provided.

[0209] In Tables 4 to 9, embedding position 1 indicates that the electronic component is embedded between the bead apex rubber and the carcass layer on the inner side in the tire width direction (reference Figure 1 ), embedding position 2 means that the electronic component is embedded between the bead apex rubber and the carcass layer on the outside of the tire width direction (reference Figure 2 ), embedding position 3 means embedding the electronic component further outside the carcass layer on the outer side in the tire width direction (reference Figure 4 ), embedding position 4 means that the electronic component is embedded between the carcass layer and the sidewall portion on the outer side of the tire width direction (reference Figure 5 ).

[0210] 4. Calculation of parameters Then, for each test tire (different from the tire from which the test piece was collected), the tire weight (kg), cross-sectional height H (mm), and outer diameter Dt (mm) were measured, and the maximum load capacity (kg) was calculated based on these. At the same time, the shortest distance D1 (mm) from the electronic component to the outer surface of the tire and the tire radial distance D2 (mm) from the upper end of the bead core to the electronic component were measured, and (D2 / H) was calculated.

[0211] At the same time, calculate 70℃tanδBA×L, tire weight / maximum load capacity, 70℃tanδBA×D2, (70℃tanδBA+70℃tanδCA)×L, (70℃E * BA+70℃E * CA) / L, 70℃E * BA / L, (70℃E * BA / 70℃E * CA) / L, 70℃E * BA / D2, D1×W.

[0212] 5. Performance evaluation test (durability evaluation of tires during driving) All tires of the vehicle (domestic front-wheel drive vehicle, displacement 2000cc) are equipped with the test tires, filled with air to an internal pressure of 230kPa, and then driven on the test section under overload. The test is repeated over bumps set on the road surface and normal driving. Starting from a speed of 50km / h, the speed is slowly increased each time it is repeated, and the previous driving speed when the driver feels abnormal is recorded.

[0213] Then, the results of each comparative example 1 (Comparative Example 1-1, Comparative Example 2-1, Comparative Example 3-1) were taken as 100, and the tire durability during running was evaluated by indexing based on the following formula. A larger numerical value indicates better tire durability during running. Durability of tires while driving =[(result of test tire) / (result of comparative example 1)]×100

[0214]

Table 4

[0215]

Table 5

[0216]

Table 6

[0217]

Table 7

[0218]

Table 8

[0219]

Table 9

[0220] The present invention has been described above based on the embodiments, but the present invention is not limited to the above-described embodiments. Various modifications can be made to the above-described embodiments within the same or equivalent scope as the present invention.

[0221] The present invention (1) relates to: A tire, characterized in that: The tire has a bead portion consisting of a tread portion, a bead apex rubber and a bead core, and a carcass layer. An electronic component is arranged between the bead apex rubber and the carcass layer. Under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%, the loss tangent 70°C tanδBA of the bead apex rubber measured in deformation mode: tension is The tire circumferential length L (mm) of the electronic component satisfies the following (Formula 1): 70℃tanδBA×L<15 (Formula 1).

[0222] The present invention (2) relates to: The tire according to the present invention (1) is characterized in that: The 70℃ tanδBA, The tire circumferential length L (mm) satisfies the following (Formula 2): 70℃tanδBA×L≦13 (Formula 2).

[0223] The present invention (3) relates to: The tire according to the present invention (2) is characterized in that: The 70℃ tanδBA, The tire circumferential length L (mm) satisfies the following (Formula 3): 70℃tanδBA×L≦10 (Formula 3).

[0224] The present invention (4) relates to: The tire according to any combination of any one of (1) to (3) of the present invention is characterized in that: The loss tangent 30°C tanδTR of the tread portion measured in a deformation mode: tension under the conditions of a temperature of 30°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1% is less than 0.25.

[0225] The present invention (5) relates to: The tire according to the present invention (4) is characterized in that: The loss tangent 0°C tanδTR of the tread portion measured in a deformation mode: tension under the conditions of a temperature of 0°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1% is greater than 0.50.

[0226] The present invention (6) relates to: The tire according to any combination of any one of (1) to (5) of the present invention is characterized in that: Tire weight (kg), and The maximum load capacity (kg) of the tire satisfies the following (Formula 4), Tire weight / maximum load capacity < 0.0150 (Formula 4).

[0227] The present invention (7) relates to: The tire according to any combination of any one of (1) to (6) of the present invention is characterized in that: The 70℃ tanδBA, The tire radial distance D2 (mm) from the upper end of the bead core to the electronic component satisfies the following (Formula 5), 70℃tanδBA×D2≦8.5 (Formula 5).

[0228] The present invention (8) relates to: The tire according to any combination of any one of (1) to (7) of the present invention is characterized in that: A clinch portion is provided on the outer side of the bead portion in the tire width direction, The 70°C tanδBA, Under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%, the loss tangent 70°C tanδCA of the overlap portion measured in deformation mode: tension is The tire circumferential length L (mm) satisfies the following (Formula 6): (70℃tanδBA+70℃tanδCA)×L≦25 (Formula 6).

[0229] The present invention (9) relates to: The tire according to any combination of any one of (1) to (8) of the present invention is characterized in that: A clinch portion is provided on the outer side of the bead portion in the tire width direction, The complex elastic modulus of the bead apex rubber measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * BA(MPa) The complex elastic modulus of the overlapped portion measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * CA (MPa), and The tire circumferential length L (mm) satisfies the following (Formula 7): (70℃E * BA+70℃E * CA) / L≧0.5 (Formula 7).

[0230] The present invention (10) relates to: The tire according to any combination of any one of (1) to (9) of the present invention is characterized in that: The complex elastic modulus of the bead apex rubber measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * BA (MPa), and The tire circumferential length L (mm) satisfies the following (Formula 8): 70℃E * BA / L≧0.5 (Formula 8).

[0231] The present invention (11) relates to: The tire according to any combination of any one of (1) to (10) of the present invention is characterized in that: A clinch portion is provided on the outer side of the bead portion in the tire width direction, The complex elastic modulus of the bead apex rubber measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * BA(MPa) The complex elastic modulus of the overlapped portion measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * CA (MPa), and The tire circumferential length L (mm) satisfies the following (Formula 9): (70℃E * BA / 70℃E * CA) / L≧0.05 (Formula 9).

[0232] The present invention (12) relates to: The tire according to any combination of any one of (1) to (11) of the present invention is characterized in that: The complex elastic modulus of the bead apex rubber measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * BA (MPa), and The tire radial distance D2 (mm) from the upper end of the bead core to the electronic component satisfies the following (Formula 10), 70℃E * BA / D2>0.85 (Equation 10).

[0233] The present invention (13) relates to: The tire according to any combination of any one of (1) to (12) of the present invention is characterized in that: The electronic component is an RFID tag or a sensor.

[0234] The present invention (14) relates to: The tire according to any combination of any one of (1) to (13) of the present invention is characterized in that: An adhesive layer or a plating layer for improving adhesion with rubber is provided on the surface of the electronic component.

[0235] The present invention (15) relates to: The tire according to any combination of any one of (1) to (14) of the present invention is characterized in that: An electronic component covering layer having a thickness of 0.5 mm or more is provided to cover the electronic component.

[0236] The present invention (16) relates to: The tire according to any combination of any one of (1) to (15) of the present invention is characterized in that: The distance H (mm) from the upper end of the bead core to the front end top of the bead apex is The tire radial distance D2 (mm) from the upper end of the bead core to the electronic component satisfies the following (Formula 11), 0.2<(D2 / H)<0.8 (Formula 11).

[0237] The present invention (17) relates to: The tire according to any combination of any one of (1) to (16) of the present invention is characterized in that: The weight W (g) of the electronic component is The shortest distance D1 (mm) from the electronic component to the outer surface of the tire satisfies the following (Formula 12): D1×W≦2.5 (Formula 12).

[0238] The present invention (18) relates to: The tire according to any combination of any one of (1) to (17) of the present invention is characterized in that: The length of the electronic component in the longitudinal direction is 80 mm or less.

[0239] The present invention (19) relates to: The tire according to the present invention (18) is characterized in that: The length of the electronic component in the longitudinal direction is 50 mm or less.

Claims

1. A tire, characterized in that: The tire comprises: a bead portion consisting of a tread portion, a bead apex rubber and a bead core, and a carcass layer. An electronic component is arranged between the bead apex rubber and the carcass layer. Under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%, the loss tangent 70°C tanδBA of the bead apex rubber measured in deformation mode: tension is The tire circumferential length L of the electronic component satisfies the following (Formula 1): 70℃tanδBA×L<15 (Formula 1), The unit of L is mm.

2. The tire according to claim 1, characterized in that The 70°C tanδBA and the tire circumferential length L satisfy the following (Formula 2): 70℃tanδBA×L≦13 (Formula 2), The unit of L is mm.

3. The tire according to claim 2, characterized in that The 70°C tanδBA and the tire circumferential length L satisfy the following (Formula 3): 70℃tanδBA×L≦10 (Formula 3), The unit of L is mm.

4. The tire according to any one of claims 1 to 3, characterized in that: The loss tangent 30°C tanδTR of the tread portion measured in a deformation mode: tension under the conditions of a temperature of 30°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1% is less than 0.

25.

5. The tire according to claim 4, characterized in that The loss tangent 0°C tanδTR of the tread portion measured in a deformation mode: tension under the conditions of a temperature of 0°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1% is greater than 0.

50.

6. The tire according to any one of claims 1 to 5, characterized in that: The tire weight and the maximum load capacity of the tire satisfy the following (Formula 4): Tire weight / maximum load capacity < 0.0150 (Formula 4), The unit of the tire weight and the maximum load capacity of the tire is kg.

7. The tire according to any one of claims 1 to 6, characterized in that: The 0℃ tanδBA, and The tire radial distance D2 from the upper end of the bead core to the electronic component satisfies the following (Formula 5): 70℃tanδBA×D2≦8.5 (Formula 5), The unit of D2 is mm.

8. The tire according to any one of claims 1 to 7, characterized in that: A lap portion is provided on the outer side of the bead portion in the tire width direction, The 70°C tanδBA, Under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%, the loss tangent 70°C tanδCA of the overlap portion measured in deformation mode: tension is The tire circumferential length L satisfies the following (Formula 6): (70℃tanδBA+70℃tanδCA)×L≦25 (Formula 6), The unit of L is mm.

9. The tire according to any one of claims 1 to 8, characterized in that A lap portion is provided on the outer side of the bead portion in the tire width direction, The complex elastic modulus of the bead apex rubber measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * BA, The complex elastic modulus of the overlapped portion measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * CA, with The circumferential length L of the tire satisfies the following (Equation 7). (70 °C E * BA + 70 °C E * (CA) / L ≥ 0.5 (Equation 7), 70°C E * BA and the 70℃E * The unit of CA is MPa, and the unit of L is mm.

10. The tire according to any one of claims 1 to 9, characterized in that The complex elastic modulus of the bead apex rubber measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * BA, with The circumferential length L of the tire satisfies the following (Equation 8). 70 °C E * BA / L ≥ 0.5 (Equation 8), 70°C E * The unit of BA is MPa, and the unit of L is mm.

11. The tire according to any one of claims 1 to 10, characterized in that A lapping portion is provided on the outer side in the tire width direction of the bead portion. The complex elastic modulus of the bead apex rubber measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * BA, The complex elastic modulus of the overlapped portion measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * CA, with The circumferential length L of the tire satisfies the following (Equation 9). (70℃E * BA / 70℃E * CA) / L ≧ 0.05 (Formula 9), 70°C E * BA and the 70℃E * The unit of CA is MPa, and the unit of L is mm.

12. The tire according to any one of claims 1 to 11, characterized in that The complex elastic modulus of the bead apex rubber measured under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, and dynamic strain rate 1% in the deformation mode: tension is 70°C E * BA, with The radial distance D2 of the tire from the upper end of the bead core to the electronic component satisfies the following (Equation 10). 70°C E * BA / D2>0.85 (Eq. 10), 70°C E * The unit of BA is MPa, and the unit of D2 is mm.

13. The tire according to any one of claims 1 to 12, characterized in that The electronic component is an RFID tag or a sensor.

14. The tire according to any one of claims 1 to 13, characterized in that An adhesive layer or a plating layer for improving the adhesiveness to rubber is provided on the surface of the electronic component.

15. The tire according to any one of claims 1 to 14, characterized in that An electronic component coating layer with a thickness of 0.5 mm or more that covers the electronic component is provided.

16. The tire according to any one of claims 1 to 15, characterized in that The distance H from the upper end of the bead core to the front top of the bead apex, and The radial distance D2 of the tire from the upper end of the bead core to the electronic component satisfy the following (Equation 11). 0.2 < D2 / H < 0.8 (Equation 11), The units of the H and the D2 are mm.

17. The tire according to any one of claims 1 to 16, characterized in that The weight W of the electronic component, and The shortest distance D1 from the electronic component to the outer surface of the tire satisfy the following (Equation 12). D1 × W ≤ 2.5 (Equation 12), The unit of the W is g, and the unit of the D1 is mm.

18. The tire according to any one of claims 1 to 17, characterized in that The length in the length direction of the electronic component is 80 mm or less.

19. The tire according to claim 18, characterized in that The length in the length direction of the electronic component is 50 mm or less.

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