Tire

Abstract

To provide a tire that is mounted with an electronic component, which is improved in durability during running of a vehicle.SOLUTION: The tire comprises a tread part, carcass layers, and a side wall part, in which an electronic component is arranged between the overlapped carcass layers, where a breaking elongation S (%) of cords constituting the carcass layers and a length L(mm) in a longitudinal direction of the electronic component satisfy the following formula (1): S / L≥0.125 (formula 1). A loss tangent 30°CtanδTR of the tread part measured in a deformation mode: tensile, under the condition that a temperature is 30°C, a frequency is 10 Hz, initial strain is 5% and dynamic strain is 1% is 0.25 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tire having an embedded electronic component such as an RFID. [Background technology]

[0002] In recent years, it has been proposed to embed electronic components such as RFID (Radio Frequency IDentification) transponders (hereinafter simply referred to as "RFID") in tires for the purpose of recording information on the tire at the time of manufacture / shipment and information on the running of the tire and communicating with the outside world (for example, Patent Documents 1 to 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2021-506676 [Patent Document 2] Special Publication No. 2021-514891 [Patent Document 3] Patent Publication No. 2021-084510 [Patent Document 4] JP 2021-127114 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when electronic components are embedded inside an unvulcanized tire and then integrated with the tire, there is a risk that the electronic components will peel off from the rubber member due to impact loads during driving, 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 electronic components while the tire is running. [Means for solving the problem]

[0006] The present invention relates to A tire having a tread portion, a carcass layer, and a sidewall portion, An electronic component is provided between the overlapping carcass layers, The breaking elongation S (%) of the cord constituting the carcass layer; The tire is characterized in that the longitudinal length L (mm) of the electronic component satisfies the following (Formula 1). S / L≧0.125 (Formula 1) Effect of the Invention

[0007] According to the present invention, it is possible to improve the durability of a tire equipped with electronic components during running. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic cross-sectional view showing a configuration of a tire according to one embodiment of the present invention. [Diagram 2] 1 is a schematic cross-sectional view showing a configuration of a tire according to one embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic diagram illustrating a configuration of an electronic component. [Figure 4] FIG. 11 is a schematic cross-sectional view illustrating the embedding position of an electronic component in a comparative example. [Diagram 5] FIG. 11 is a schematic cross-sectional view illustrating the embedding position of an electronic component in a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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. Overview The tire according to the present invention is a tire having a tread portion, a carcass layer, and a sidewall portion, and an electronic component is provided between the overlapping carcass layers. The breaking elongation S (%) of the cord (carcass cord) constituting the carcass layer and the longitudinal length L (mm) of the electronic component satisfy the following (Formula 1). S / L≧0.125 (Formula 1)

[0011] These characteristics can improve the durability of the tire with embedded electronic components during running, as described below.

[0012] 2. Mechanism of effect manifestation in the tire according to the present invention The mechanism by which the above-mentioned effects are exhibited in the tire according to the present invention is believed to be as follows.

[0013] In the present invention, as described above, the electronic components are provided between the overlapping carcass layers.

[0014] The carcass layer is a tire component that forms the tire's framework and has a much higher elastic modulus than other tire components. Since the carcass layer that forms the tire's framework is the center of tire deformation, it is considered that the amount of deformation near the carcass layer during running is smaller than that of the surrounding area.

[0015] For this reason, when electronic components are sandwiched between overlapping carcass layers, the amount of deformation around the electronic components during running can be reduced, and peeling and damage around the electronic components can be suppressed, which is believed to improve the durability of the tire with electronic components attached during running.

[0016] On the other hand, if the electronic components are disposed close to the carcass layer, there is a concern that the carcass cord may be damaged by minute friction generated between the carcass layer and the electronic components.

[0017] In other words, in the area where the electronic components and the carcass layer are in contact, the carcass layer is restrained by the electronic components, so that during running, the carcass layer has difficulty following the deformation around the electronic components, which is thought to be why the above-mentioned minute friction occurs.

[0018] Therefore, by making the breaking elongation S (%) of the carcass cord sufficiently large relative to the length restrained by the electronic component, i.e., the longitudinal length L (mm) of the electronic component, specifically, by making (S / L) 0.125 or more, it is believed that the carcass layer will be able to easily follow the deformation, and the durability of the tire to which the electronic component is attached during running can be improved.

[0019] As described above, in the tire according to the present invention, by providing electronic components between overlapping carcass layers to reduce the amount of deformation around the electronic components, and by appropriately controlling (S / L) to 0.125 or more to suppress the occurrence of minute friction, damage to the carcass cords can be suppressed, and it is believed that the durability of the tire equipped with electronic components during running can be improved.

[0020] In the present invention, the breaking elongation S (%) of the carcass cord is a value measured in accordance with the method specified in JIS L1017:2002.

[0021] [2] More preferred embodiments of the tire according to the present invention The tire according to the present invention can achieve even greater effects by adopting the following aspects.

[0022] 1. Loss tangent of the tread In the present invention, the loss tangent 30°C tan δTR of the tread portion measured under conditions of a temperature of 30°C, a frequency of 10 Hz, an initial strain of 5%, a dynamic strain rate of 1%, and a deformation mode of tension is preferably 0.25 or less, and more preferably 0.15 or less.

[0023] Loss tangent tan δ is a viscoelastic parameter that indicates the energy absorption performance, and the larger the value, the more energy is absorbed and the more heat is generated. Therefore, by setting 30°C tan δTR to a small value, heat generation in the tread portion during running can be suppressed. As a result, the temperature rise of the carcass layer in which the electronic components are sandwiched is suppressed, and the amount of deformation around the electronic components can be reduced, which is thought to further improve the durability of the tire with electronic components attached during running.

[0024] In this case, it is more preferable that the loss tangent 0°C tan δTR of the tread portion measured in the deformation mode: tension under the conditions of temperature 0°C, frequency 10Hz, initial strain 5%, and dynamic strain rate 1%, is 0.50 or more. In this way, by increasing the loss tangent tan δ at low temperatures, even if a large deformation is suddenly applied to the tire surface while traveling, the tread portion can easily absorb the deformation, which is thought to further improve the durability of tires equipped with electronic components while traveling.

[0025] In the above, the loss tangent (tan δ) can be measured using a viscoelasticity measuring device such as "IPLEXER (registered trademark)" manufactured by GABO.

[0026] The "tread portion" refers to the region that forms the tire's contact surface, and is located radially outward of the components that contain fiber materials, such as the carcass, belt layer, and belt reinforcing layer. The tread portion may be formed of only one cap rubber layer, or may be formed of two layers with a base rubber layer provided inside the cap rubber layer, or may be formed of three layers, or may be formed of four or more layers. In this case, the thickness of the cap rubber layer in the entire tread portion is preferably 10% or more. It is more preferable that the thickness of the cap rubber layer in the entire tread portion is 70% or more.

[0027] The thickness of the cap rubber layer and the thickness of the base rubber layer described above can be calculated by adding up the thickness of the cap rubber layer and the thickness of the base rubber layer in the thickness of the tread portion measured in a cross section cut out radially from the tire with the bead portion aligned to the normal rim width.

[0028] Here, the term "genuine rim" refers to a rim that is determined for each tire by the standard system that includes the standard on which the tire is based, such as the standard rim for the applicable size described in the "JATMA YEAR BOOK" for JATMA (Japan Automobile Tire Manufacturers Association), the "Measuring Rim" described in the "STANDARDS MANUAL" for ETRTO (The European Tire and Rim Technical Organisation), and the "Design Rim" described in the "YEAR BOOK" for TRA (The Tire and Rim Association, Inc.), and refers to JATMA, ETRTO, and TRA in that order, and follows the standard if there is an applicable size at the time of reference. In the case of a tire not specified in the standard, it refers to a rim that can be assembled to a rim and can hold internal pressure, that is, a rim that does not leak air from between the rim and tire, with the smallest rim diameter and the next narrowest rim width.

[0029] 2. Tire weight and maximum load capacity In the present invention, the ratio of the tire weight (kg) to the tire's maximum load capacity (kg) (tire weight / maximum load capacity) is preferably less than 0.0150, and more preferably less than 0.0135. In this way, a tire with a small tire weight compared to its maximum load capacity has a relatively thin rubber, which is believed to sufficiently suppress the temperature rise of the entire tire and reduce the amount of deformation, thereby further improving the durability of tires equipped with electronic components during running.

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

[0031] The "maximum load capacity (kg)" can be calculated as WL from the following formula, where Wt (mm) is the tire section width, Ht (mm) is the tire section height, and Dt (mm) is the tire outer diameter measured under normal conditions. Here, the tire section width Wt is the maximum width between the outer surfaces of the sidewalls under normal conditions, excluding any patterns or letters on the side of the tire. The tire section height Ht is half the difference between the tire outer diameter 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" refers to a state in which the tire is mounted on a normal rim, inflated to normal internal pressure, and unloaded. Note that "normal internal pressure" refers to the air pressure specified for each tire by each standard in the standard system including the standard on which the tire is based, and refers to the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" for TRA, referring to JATMA, ETRTO, and TRA in that order, and following the standard if there is an applicable size at the time of reference. In the case of a tire not specified in the standard, it refers to the normal internal pressure (250 KPa or more) of another tire size (specified in the standard) that is specified with the above-mentioned normal rim as the standard rim. Note that if multiple normal internal pressures of 250 KPa or more are specified, it refers to the minimum value among them.

[0033] 3. Relationship between the breaking elongation of carcass cords and the distance from electronic components to the outer surface of the tire In order to reduce the difference between the deformation amount of the carcass cord and the deformation amount of the electronic component, the deformation of the carcass layer adjacent to the electronic component must be minimized. For this purpose, it is preferable that the distance between the electronic component and the outer surface of the tire is large.

[0034] On the other hand, the larger the elastic elongation of the carcass layer, the larger the allowable range of the deformation amount difference. In consideration of the above, it is preferable that the product S×D of the breaking elongation S (%) of the carcass cord and the shortest distance D (mm) from the surface of the electronic component to the outer surface of the tire is a certain value or more, specifically, it is preferable that it is 10 or more.

[0035] 4. Breaking elongation of carcass cord and complex modulus of elasticity of sidewall Complex modulus of elasticity of the sidewall part, specifically, complex modulus of elasticity of the sidewall part measured under the conditions of temperature 70°C, frequency 10Hz, initial strain 5%, dynamic strain rate 1%, deformation mode: tension 70°C E * The elongation of the carcass layer, i.e., the breaking elongation S (%) of the carcass cord is sufficiently increased relative to SW (MPa), (S / 70°C E * It is believed that by increasing the thickness (SW), the carcass layer is sufficiently stretched and deformed, thereby making it possible to suppress breakage of the carcass layer.

[0036] In addition, the length by which the movement of the electronic component is restricted, i.e., the longitudinal length L (mm) of the electronic component, is expressed as the above (S / 70°C E * It is believed that by sufficiently increasing the SW, breakage of the carcass layer can be suppressed.

[0037] Therefore, (S / 70℃E * It is believed that by setting the ratio SW) / L to 0.025 or more, the durability of a tire equipped with electronic components while it is in motion can be further improved.

[0038] In the above, the complex elastic modulus (E * ) can be measured using a viscoelasticity measuring device such as "IPLEXER (registered trademark)" manufactured by GABO, in the same manner as in the measurement of the loss tangent.

[0039] 5. Loss tangent of sidewall and longitudinal length of electronic component The longer the length of contact with the electronic components, the greater the risk of the electronic components peeling off from the carcass layer due to heat accumulation around the electronic components. Therefore, it is preferable to set the product of the loss tangent (tan δ), which is a parameter of the heat generation property of the sidewall portion, which is the outer layer member, and the length of the electronic components to a certain value or less, specifically, (70°C tan δSW×L) to 12 or less. This reduces the amount of heat around the electronic components, making it easier to suppress peeling off from the carcass layer, and is therefore believed to further improve the durability of the tire equipped with the electronic components during running.

[0040] At this time, it is considered that by increasing the breaking elongation S (%) of the carcass cord, the carcass layer can be made to easily stretch, and can easily and sufficiently follow the deformation of the sidewall portion.

[0041] Therefore, if the ratio of the above-mentioned (70°C tan δSW×L) to S ((70°C tan δSW×L) / S) is 1.2 or less, it is possible to reduce the amount of heat around the electronic components and sufficiently increase the elongation of the carcass layer, thereby enabling a further improvement in the durability of the tire equipped with electronic components during running.

[0042] 6. Electronic Components In the present invention, it is preferable to use an RFID or a sensor as the electronic component, and an RFID is more preferable considering that it can store a large amount of information and can be read without contact, and can store tire manufacturing information, management information, customer information, etc. in addition to data such as pressure and temperature. Specific examples of the sensor include a pressure sensor, a temperature sensor, an acceleration sensor, a magnetic sensor, and a groove depth sensor.

[0043] It is preferable that the surface of the electronic component is provided with an adhesive layer or a plating layer for improving adhesion to the rubber, thereby making it possible to sufficiently prevent the electronic component from peeling off.

[0044] As a specific adhesive layer, a known metal-rubber adhesive can be used, which can be purchased from LORD Corp., etc. As a plating layer, it is preferable to include, for example, copper, and it is preferable to alloy it with tin, nickel, iron, zinc, cobalt, aluminum, magnesium, or the like.

[0045] In addition, it is preferable that an electronic component covering layer having a thickness of 0.5 mm or more is provided on the surface of the electronic component. In this way, by providing an appropriate gap between the electronic component and the adjacent sidewall portion or carcass layer, the electronic component is less susceptible to the influence of deformation at the interface, and peeling of the electronic component can be sufficiently suppressed.

[0046] As a specific example of the electronic component covering layer, a rubber composition or a thermoplastic elastomer composition can be used, such as the rubber compositions described in this specification or rubber compositions known in the field of tires.

[0047] In the present invention, the longitudinal length L of the electronic component (including the antenna) is preferably 80 mm or less, and more preferably 50 mm or less. This size makes it possible to prevent local stress concentration and to properly align the electronic component and adhere it closely to the tire components, thereby sufficiently preventing peeling.

[0048] The product (D×W) of the shortest distance D (mm) to the outer surface of the tire and the weight W (g) of the electronic component is preferably 2.5 or less. By controlling D×W to such a value, deformation around the electronic component can be sufficiently suppressed, and peeling can be suppressed.

[0049] In the present invention, in consideration of the purpose and durability of the electronic components, it is preferable that the electronic components be disposed radially inward of the maximum width of the tire and at a position 25 mm or more away from the lower end of the bead core.

[0050] In the above, the "lower end portion of the bead core" refers to the lower edge portion of the bead core in the tire radial direction.

[0051] [3] Implementation form Hereinafter, the present invention will be described in detail based on the embodiments.

[0052] 1. Tire according to the present embodiment 1 and 2 are schematic cross-sectional views showing the structure of a tire according to an embodiment of the present invention. In Fig. 1 and Fig. 2, 1 is a tire, 2 is a bead portion, 3 is a sidewall portion, 4 is a tread portion, 31 is a sidewall, 32 is a carcass layer, 33 is an inner liner, and 34 is an electronic component. The carcass layer 32 is folded back from the inner side in the tire width direction to the outer side at the lower end of the bead core 21 along the bead core 21 and the bead apex 22 that constitute the bead portion 2, and then bonded to the inner carcass layer 32. A chafer 24 is provided on the inner side in the tire width direction of the bead portion 2, and a clinch 23 that extends to the chafer 24 is provided on the outer side in the tire width direction.

[0053] 1 and 2, in this embodiment, the electronic component 34 is provided between the overlapping carcass layers 32, 32. Here, "provided between the overlapping carcass layers 32, 32" indicates that the electronic component is provided between the surfaces of the overlapping carcass layers 32, 32 opposite to the surfaces where the overlapping carcass layers 32, 32 contact each other, and also includes the case where the electronic component is embedded in either of the carcass layers.

[0054] For example, in FIG. 1, in a carcass layer having a normal turned-up structure, electronic components 34 are provided between the carcass layer 32 on the inner side in the tire width direction and the carcass layer 32 on the outer side, near the widest part of the tire, while in FIG. 2, in a carcass layer having an ultra-high turn-up structure extending to the bottom of the tread portion, electronic components 34 are provided between the carcass layer 32 on the inner side in the tire width direction and the carcass layer 32 on the contact surface side of the widest part of the tire.

[0055] The carcass layer may have a two-case structure other than the above-mentioned normal winding structure or ultra-high turn-up structure. In addition, from the viewpoint of suppressing deformation, members other than electronic components may be disposed between the carcass layers.

[0056] 3A and 3B are schematic plan views showing the configuration of the electronic component used in this embodiment, showing two examples (a) and (b). As shown in Fig. 3A and 3B, the electronic component 34 is composed of a main body 34a made of an IC chip and an antenna 34b.

[0057] With this configuration, the sidewall portion 3, the tread portion 4, and the carcass layer 32 satisfy the above-mentioned parameters, so that the amount of deformation around the electronic components is reduced and the amount of deformation around the electronic components is sufficiently reduced to suppress breakage and damage to the electronic components, thereby improving the durability of the tire to which the electronic components are attached while it is in motion.

[0058] 2. Rubber composition In the present embodiment, the rubber compositions constituting the carcass, tread, and sidewall (hereinafter referred to as the "rubber composition for carcass", the "rubber composition for tread", and the "rubber composition for sidewall", respectively) can be obtained by kneading various compounding materials such as rubber components, reinforcing materials, antioxidants, oils, resin materials, antioxidants, and additives.

[0059] (1) Compounding materials (a) Rubber component In each rubber composition, the rubber component is not particularly limited, and for example, diene rubbers such as natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), chloroprene rubber (CR), and butyl rubber (IIR) can be used. These may be used alone, or two or more may be used in combination. For example, in a rubber composition for a carcass, a combination of an isoprene rubber and an SBR is preferred. And, in a rubber composition for a sidewall, a combination of a BR and an isoprene rubber is preferred. Also, in a rubber composition for a tread, a combination of an SBR and a BR is preferred.

[0060] (a) Isoprene rubber Examples of isoprene-based rubber include natural rubber (NR), isoprene rubber (IR), modified NR, modified NR, and modified IR, with NR being preferred from the standpoint of excellent strength.

[0061] As the NR, for example, SVR-L, SIR20, RSS♯3, TSR20, etc., which are common in the tire industry, can be used. As the IR, there is no particular limitation, and for example, IR2200 manufactured by Zeon Corporation, etc., which are common in the tire industry, can be used. As the modified NR, deproteinized natural rubber (DPNR), highly purified natural rubber (UPNR), etc. can be used. As the modified NR, epoxidized natural rubber (ENR), hydrogenated natural rubber (HNR), grafted natural rubber, etc. can be used. As the modified IR, epoxidized isoprene rubber, hydrogenated isoprene rubber, grafted isoprene rubber, etc. can be used. These may be used alone or in combination of two or more kinds.

[0062] In the rubber composition for carcass, the content of the isoprene-based rubber in 100 parts by mass of the rubber component is preferably 55 parts by mass or more, more preferably 60 parts by mass or more, and even more preferably 65 parts by mass or more, while it is preferably 90 parts by mass or less, more preferably 85 parts by mass or less, and even more preferably 80 parts by mass or less.

[0063] In the rubber composition for sidewalls, the content of the isoprene-based rubber 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 even more preferably 40 parts by mass or more, while it is preferably 60 parts by mass or less, more preferably 55 parts by mass or less, and even more preferably 50 parts by mass or less.

[0064] Furthermore, the rubber composition for tread may contain 1 part by mass or more and 45 parts by mass or less of an isoprene-based rubber per 100 parts by mass of the rubber component, if necessary.

[0065] (b) SBR The weight average molecular weight of SBR is, for example, more than 100,000 and less than 2,000,000. The styrene content of SBR is, for example, preferably more than 5% by mass, more preferably more than 10% by mass, and even more preferably more than 15% by mass. On the other hand, it is preferably less than 40% by mass, more preferably less than 35% by mass, and even more preferably less than 30% by mass. The vinyl content (amount of 1,2-bonded butadiene units) of SBR is, for example, preferably more than 5% by mass, more preferably more than 10% by mass, and even more preferably more than 15% by mass. On the other hand, it is preferably less than 70% by mass, more preferably less than 40% by mass, and even more preferably less than 30% by mass. The structure identification of SBR (measurement of styrene content and vinyl content) can be performed, for example, using a JNM-ECA series device manufactured by JEOL Ltd.

[0066] There are no particular limitations on the SBR, and for example, emulsion-polymerized styrene-butadiene rubber (E-SBR), solution-polymerized styrene-butadiene rubber (S-SBR), etc. can be used. The SBR may be either unmodified SBR or modified SBR. In addition, hydrogenated SBR obtained by hydrogenating the butadiene portion of SBR may be used, and hydrogenated SBR may be obtained by subsequently hydrogenating the BR portion of SBR, or a similar structure may be obtained by copolymerizing styrene, ethylene, and butadiene.

[0067] The modified SBR is preferably an SBR having a functional group that interacts with a filler such as silica. Examples of such modified SBR include terminal-modified SBR in which at least one end of the SBR has been modified with a compound (modifying agent) having the above-mentioned functional group (terminal-modified SBR having the above-mentioned functional group at the end), main-chain-modified SBR in which the main chain has the above-mentioned functional group, main-chain-terminal-modified SBR in which the main chain and at least one end are modified with the above-mentioned modifier, and terminal-modified SBR modified (coupled) with a polyfunctional compound having two or more epoxy groups in the molecule and having a hydroxyl group or epoxy group introduced therein.

[0068] Examples of the functional group include an amino group, an amide group, a silyl group, an alkoxysilyl group, an isocyanate group, an imino group, an imidazole group, a urea group, an ether group, a carbonyl group, an oxycarbonyl group, a mercapto group, a sulfide group, a disulfide group, a sulfonyl group, a sulfinyl group, a thiocarbonyl group, an ammonium group, an imide group, a hydrazo group, an azo group, a diazo group, a carboxyl group, a nitrile group, a pyridyl group, an alkoxy group, a hydroxyl group, an oxy group, an epoxy group, etc. These functional groups may have a substituent.

[0069] Furthermore, as the modified SBR, for example, SBR modified with a compound (modifying agent) represented by the following formula can be used.

[0070] [ka]

[0071] In the formula, 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 R5 may bond to form a ring structure together with the nitrogen atom, and n represents an integer.

[0072] As the modified SBR modified with a compound (modifier) ​​represented by the above formula, SBR in which the polymerization terminals (active terminals) of solution-polymerized styrene-butadiene rubber (S-SBR) have been modified with a compound represented by the above formula (such as the modified SBR described in JP 2010-111753 A).

[0073] R 1 , R 2 and R 3 R is 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 is 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. In addition, R 4 and R 5 When the nitrogen atom and the nitrogen atom are bonded to each other to form a ring structure, the ring is preferably a 4- to 8-membered ring. The alkoxy group also includes a cycloalkoxy group (such as a cyclohexyloxy group) and an aryloxy group (such as a phenoxy group and a benzyloxy group).

[0074] Specific examples of the modifying agent include 2-dimethylaminoethyltrimethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 2-dimethylaminoethyltriethoxysilane, 3-dimethylaminopropyltriethoxysilane, 2-diethylaminoethyltrimethoxysilane, 3-diethylaminopropyltrimethoxysilane, 2-diethylaminoethyltriethoxysilane, 3-diethylaminopropyltriethoxysilane, etc. These may be used alone or in combination of two or more.

[0075] In addition, modified SBR modified with the following compounds (modifiers) can also be used as the modified SBR. Examples of the modifiers include polyglycidyl ethers of polyhydric alcohols such as ethylene glycol diglycidyl ether, glycerin triglycidyl ether, trimethylolethane triglycidyl ether, and trimethylolpropane triglycidyl ether; polyglycidyl ethers of aromatic compounds having two or more phenol groups such as diglycidylated bisphenol A; polyepoxy compounds such as 1,4-diglycidylbenzene, 1,3,5-triglycidylbenzene, and polyepoxidized liquid polybutadiene; epoxy group-containing tertiary amines such as 4,4'-diglycidyl-diphenylmethylamine and 4,4'-diglycidyl-dibenzylmethylamine; diglycidylaniline, N,N'-diglycidyl-4-glycidyloxyaniline, Diglycidyl amino compounds such as diglycidyl orthotoluidine, tetraglycidyl meta-xylylenediamine, tetraglycidyl aminodiphenylmethane, tetraglycidyl-p-phenylenediamine, diglycidyl aminomethylcyclohexane, and tetraglycidyl-1,3-bisaminomethylcyclohexane; amino group-containing acid chlorides such as bis-(1-methylpropyl)carbamic acid chloride, 4-morpholinecarbonyl chloride, 1-pyrrolidinecarbonyl chloride, N,N-dimethylcarbamic acid chloride, and N,N-diethylcarbamic acid chloride; epoxy group-containing silane compounds such as 1,3-bis-(glycidyloxypropyl)-tetramethyldisiloxane and (3-glycidyloxypropyl)-pentamethyldisiloxane;(Trimethylsilyl)[3-(trimethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(triethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(trippropoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(tributoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldimethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldiethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldipropoxy sulfide group-containing silane compounds such as (trimethylsilyl)[3-(methyldibutoxysilyl)propyl]sulfide and (trimethylsilyl)[3-(methyldibutoxysilyl)propyl]sulfide; N-substituted aziridine compounds such as ethyleneimine and propyleneimine; methyltriethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltrimethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltriethoxysilane, N,N-bis(trimethylsilyl)aminoethyltrimethoxysilane, N,N-bis(trimethylsilyl)aminoethyltrimethoxysilane, Alkoxysilanes such as thyltriethoxysilane; (thio)benzophenone compounds having amino groups and / or substituted amino groups, such as 4-N,N-dimethylaminobenzophenone, 4-N,N-di-t-butylaminobenzophenone, 4-N,N-diphenylaminobenzophenone, 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)benzophenone, 4,4'-bis(diphenylamino)benzophenone, and N,N,N',N'-bis-(tetraethylamino)benzophenone; Benzaldehyde compounds having an amino group and / or a substituted amino group, such as dimethylaminobenzaldehyde, 4-N,N-diphenylaminobenzaldehyde, 4-N,N-divinylaminobenzaldehyde, etc.; N-substituted pyrrolidones, such as N-methyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-phenyl-2-pyrrolidone, Nt-butyl-2-pyrrolidone, N-methyl-5-methyl-2-pyrrolidone, etc.; N-substituted piperidones, such as N-methyl-2-piperidone, N-vinyl-2-piperidone, N-phenyl-2-piperidone, etc.;N-substituted lactams such as N-methyl-ε-caprolactam, N-phenyl-ε-caprolactam, N-methyl-ω-laurylolactam, N-vinyl-ω-laurylolactam, N-methyl-β-propiolactam, and N-phenyl-β-propiolactam; as well as N,N-bis-(2,3-epoxypropoxy)-aniline, 4,4-methylene-bis-(N,N-glycidylaniline), and tris-(2,3-epoxypropyl)-1,3,5-triazine-2,4,6-trione. , N,N-diethylacetamide, N-methylmaleimide, N,N-diethylurea, 1,3-dimethylethyleneurea, 1,3-divinylethyleneurea, 1,3-diethyl-2-imidazolidinone, 1-methyl-3-ethyl-2-imidazolidinone, 4-N,N-dimethylaminoacetophene, 4-N,N-diethylaminoacetophenone, 1,3-bis(diphenylamino)-2-propanone, 1,7-bis(methylethylamino)-4-heptanone, etc. Modification with the above compounds (modifiers) can be carried out by known methods.

[0076] As the SBR, for example, SBR manufactured and sold by Sumitomo Chemical Co., Ltd., ENEOS Material Corporation, Asahi Kasei Corporation, Zeon Corporation, etc. may be used. The SBR may be used alone or in combination of two or more kinds.

[0077] In the rubber composition for carcass, the content of SBR in 100 parts by mass of the rubber component is preferably 15 parts by mass or more, more preferably 20 parts by mass or more, and is preferably 40 parts by mass or less, more preferably 35 parts by mass or less.

[0078] In the rubber composition for tread, the content of SBR in 100 parts by mass of the rubber component is preferably 60 parts by mass or more, and more preferably 70 parts by mass or more. The upper limit is not particularly limited, but is preferably 90 parts by mass or less, and more preferably 80 parts by mass or less.

[0079] Furthermore, the rubber composition for sidewalls may contain 1 part by mass or more and less than 40 parts by mass of SBR per 100 parts by mass of the rubber component, if necessary.

[0080] (C)BR The weight average molecular weight of the BR is, for example, more than 100,000 and less than 2,000,000. The vinyl content of the BR is, for example, more than 1 mass% and less than 30 mass%. The cis content of the BR (cis-1,4 content) is, for example, more than 1 mass% and 98 mass% or less. The trans content of the BR is, for example, more than 1 mass% and less than 60 mass%. The cis content can be measured by infrared absorption spectroscopy.

[0081] The BR is not particularly limited, and can be BR with a high cis content (cis content of 90% or more), BR with a low cis content, BR containing syndiotactic polybutadiene crystals, etc. The BR can be either unmodified BR or modified BR, and the modified BR can be, for example, BR modified with a compound (modifier) ​​represented by the following formula:

[0082] [ka]

[0083] In the formula, 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 may be bonded to form a ring structure together with the nitrogen atom, and n represents an integer.

[0084] The modified BR modified with a compound (modifying agent) represented by the above formula includes BR whose polymerization terminal (active terminal) has been modified with a compound represented by the above formula.

[0085] R 1 , R 2 and R 3 R is 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 is 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. In addition, R 4 and R 5 When the nitrogen atom and the nitrogen atom are bonded to each other to form a ring structure, the ring is preferably a 4- to 8-membered ring. The alkoxy group also includes a cycloalkoxy group (such as a cyclohexyloxy group) and an aryloxy group (such as a phenoxy group and a benzyloxy group).

[0086] Specific examples of the modifying agent include 2-dimethylaminoethyltrimethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 2-dimethylaminoethyltriethoxysilane, 3-dimethylaminopropyltriethoxysilane, 2-diethylaminoethyltrimethoxysilane, 3-diethylaminopropyltrimethoxysilane, 2-diethylaminoethyltriethoxysilane, 3-diethylaminopropyltriethoxysilane, etc. These may be used alone or in combination of two or more.

[0087] The modified BR may be modified with the following compounds (modifiers): polyglycidyl ethers of polyhydric alcohols such as ethylene glycol diglycidyl ether, glycerin triglycidyl ether, trimethylolethane triglycidyl ether, and trimethylolpropane triglycidyl ether; polyglycidyl ethers of aromatic compounds having two or more phenol groups such as diglycidylated bisphenol A; polyepoxy compounds such as 1,4-diglycidylbenzene, 1,3,5-triglycidylbenzene, and polyepoxidized liquid polybutadiene; epoxy group-containing tertiary amines such as 4,4'-diglycidyl-diphenylmethylamine and 4,4'-diglycidyl-dibenzylmethylamine; diglycidylaniline, N,N'-diglycidyl-4-glycidyloxyaniline, Diglycidyl amino compounds such as diglycidyl orthotoluidine, tetraglycidyl meta-xylylenediamine, tetraglycidyl aminodiphenylmethane, tetraglycidyl-p-phenylenediamine, diglycidyl aminomethylcyclohexane, and tetraglycidyl-1,3-bisaminomethylcyclohexane; amino group-containing acid chlorides such as bis-(1-methylpropyl)carbamic acid chloride, 4-morpholinecarbonyl chloride, 1-pyrrolidinecarbonyl chloride, N,N-dimethylcarbamic acid chloride, and N,N-diethylcarbamic acid chloride; epoxy group-containing silane compounds such as 1,3-bis-(glycidyloxypropyl)-tetramethyldisiloxane and (3-glycidyloxypropyl)-pentamethyldisiloxane;(Trimethylsilyl)[3-(trimethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(triethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(trippropoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(tributoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldimethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldiethoxysilyl)propyl]sulfide, (trimethylsilyl)[3-(methyldipropoxy sulfide group-containing silane compounds such as (trimethylsilyl)[3-(methyldibutoxysilyl)propyl]sulfide and (trimethylsilyl)[3-(methyldibutoxysilyl)propyl]sulfide; N-substituted aziridine compounds such as ethyleneimine and propyleneimine; methyltriethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltrimethoxysilane, N,N-bis(trimethylsilyl)-3-aminopropyltriethoxysilane, N,N-bis(trimethylsilyl)aminoethyltrimethoxysilane, N,N-bis(trimethylsilyl)aminoethyltrimethoxysilane, Alkoxysilanes such as thyltriethoxysilane; (thio)benzophenone compounds having amino groups and / or substituted amino groups, such as 4-N,N-dimethylaminobenzophenone, 4-N,N-di-t-butylaminobenzophenone, 4-N,N-diphenylaminobenzophenone, 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)benzophenone, 4,4'-bis(diphenylamino)benzophenone, and N,N,N',N'-bis-(tetraethylamino)benzophenone; Benzaldehyde compounds having an amino group and / or a substituted amino group, such as dimethylaminobenzaldehyde, 4-N,N-diphenylaminobenzaldehyde, 4-N,N-divinylaminobenzaldehyde, etc.; N-substituted pyrrolidones, such as N-methyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-phenyl-2-pyrrolidone, Nt-butyl-2-pyrrolidone, N-methyl-5-methyl-2-pyrrolidone, etc.; N-substituted piperidones, such as N-methyl-2-piperidone, N-vinyl-2-piperidone, N-phenyl-2-piperidone, etc.;N-substituted lactams such as N-methyl-ε-caprolactam, N-phenyl-ε-caprolactam, N-methyl-ω-laurylolactam, N-vinyl-ω-laurylolactam, N-methyl-β-propiolactam, and N-phenyl-β-propiolactam; as well as N,N-bis-(2,3-epoxypropoxy)-aniline, 4,4-methylene-bis-(N,N-glycidylaniline), and tris-(2,3-epoxypropyl)-1,3,5-triazine-2,4,6-trione. , N,N-diethylacetamide, N-methylmaleimide, N,N-diethylurea, 1,3-dimethylethyleneurea, 1,3-divinylethyleneurea, 1,3-diethyl-2-imidazolidinone, 1-methyl-3-ethyl-2-imidazolidinone, 4-N,N-dimethylaminoacetophene, 4-N,N-diethylaminoacetophenone, 1,3-bis(diphenylamino)-2-propanone, 1,7-bis(methylethylamino)-4-heptanone, etc. The modification with the above-mentioned compound (modifying agent) can be carried out by a known method. These modified BRs may be used alone or in combination of two or more kinds.;

[0088] As the BR, for example, products from Ube Industries, Ltd., ENEOS Materials Corporation, Asahi Kasei Corporation, Zeon Corporation, etc. can be used.

[0089] In the rubber composition for tread, the content of BR in 100 parts by mass of the rubber component is preferably 15 parts by mass or more, more preferably 20 parts by mass or more, and is preferably 35 parts by mass or less, more preferably 30 parts by mass or less.

[0090] In the rubber composition for sidewalls, the content of BR in 100 parts by mass of the rubber component is preferably 45 parts by mass or more, and more preferably 50 parts by mass or more, and is preferably 65 parts by mass or less, and more preferably 60 parts by mass or less.

[0091] Furthermore, the rubber composition for the carcass may contain 1 part by mass or more and less than 10 parts by mass of BR per 100 parts by mass of the rubber component, if necessary.

[0092] (D) Other rubber components In the present embodiment, each rubber composition may contain, as other rubber components, rubber (polymer) that is generally used in the manufacture of tires, such as nitrile rubber (NBR), as necessary.

[0093] (b) Compounding materials other than rubber components (a) Filler In the present embodiment, each rubber composition preferably contains a reinforcing agent such as carbon black or silica as a filler. In addition to the above-mentioned carbon black and silica, examples of the filler include calcium carbonate, talc, alumina, clay, aluminum hydroxide, mica, etc. In addition, when silica is used, it is preferable to use it in combination with a silane coupling agent.

[0094] The total amount of the filler in each rubber composition is preferably 40 parts by mass or more, and more preferably 50 parts by mass or more, per 100 parts by mass of the rubber component, while from the viewpoint of dispersibility in the rubber composition, it is preferably 150 parts by mass or less, and more preferably 100 parts by mass or less.

[0095] (i) Carbon black Carbon black is used for the purpose of improving the crack growth resistance, durability, resistance to deterioration due to ultraviolet rays, etc. of tires.

[0096] From the viewpoint of reinforcing the rubber, the nitrogen adsorption specific surface area (N2SA) of carbon black is, for example, 30 m 2 / g or more, and 2 / g or more is more preferable, and 60m 2 On the other hand, from the viewpoint of heat generation, it is more preferable that the viscosity is 250 m 2 / g or less, and2 / g or less is more preferable, and 2 / g or less is more preferable. From the viewpoint of rubber rigidity, the dibutyl phthalate (DBP) absorption of carbon black is, for example, preferably 50 ml / 100 g or more, and more preferably 100 ml / 100 g or more. On the other hand, from the viewpoint of rubber deformation compliance, it is preferably 250 ml / 100 g or less, and more preferably 150 ml / 100 g or less. 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.

[0097] The carbon black is not particularly limited, and examples thereof include furnace blacks (furnace carbon blacks) such as SAF, ISAF, HAF, MAF, FEF, SRF, GPF, APF, FF, CF, SCF, and ECF; acetylene black (acetylene carbon black); thermal blacks (thermal carbon blacks) such as FT and MT; and channel blacks (channel carbon blacks) such as EPC, MPC, and CC. These may be used alone or in combination of two or more. In addition to carbon blacks made from mineral oils and the like, biomass-derived carbon blacks obtained by burning lignin and the like, and recycled carbon blacks obtained by pyrolyzing and refining rubber products containing carbon black, such as tires, may be used by appropriately replacing them in equal amounts.

[0098] Specific carbon black is not particularly limited, and examples thereof include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, and N762. Commercially available products that can be used include those manufactured by Asahi Carbon Co., Ltd., Cabot Japan Co., Ltd., Tokai Carbon Co., Ltd., Mitsubishi Chemical Corporation, Lion Corporation, Shinnikka Carbon Co., Ltd., Columbia Carbon Company, and the like. These may be used alone or in combination of two or more types.

[0099] In the rubber composition for carcass, the content of carbon black per 100 parts by mass of the rubber component is, for example, preferably 30 parts by mass or more, more preferably 40 parts by mass or more, while it is preferably 60 parts by mass or less, more preferably 50 parts by mass or less.

[0100] In the rubber composition for sidewalls, the content of carbon black per 100 parts by mass of the rubber component is preferably 40 parts by mass or more, and more preferably 50 parts by mass or more, and is preferably 70 parts by mass or less, and more preferably 60 parts by mass or less.

[0101] In the rubber composition for treads, the content of carbon black per 100 parts by mass of the rubber component is preferably 3 parts by mass or more, more preferably 8 parts by mass or more, and is preferably 17 parts by mass or less, more preferably 12 parts by mass or less.

[0102] (ii) Silica Since silica is not conductive, when used as a reinforcing material, it can reduce the dielectric constant and expand the reading range of electronic components. In addition, the hydrated water and surface functional groups contained in silica can capture ozone, improving ozone resistance and improving tire durability.

[0103] As for silica, if the average primary particle size is too small, the processability is poor, so it is preferable to use silica having an average primary particle size of more than 8 nm. It is more preferable to use silica having an average primary particle size of 9 nm or more, and even more preferable to use silica having an average primary particle size of 10 nm or more. On the other hand, from the viewpoint of ensuring the reinforcement of the rubber and the steering stability performance on a wet road surface during driving, it is preferable to use silica having an average primary particle size of 25 nm or less, more preferably 20 nm or less, and even more preferably 17 nm or less.

[0104] The average primary particle size of silica refers to the average value of the values ​​obtained by observing the smallest particle unit of silica constituting the aggregate structure as a circle and measuring the absolute maximum length of the smallest particle as the diameter of the circle, and can be determined by observing with a transmission or scanning electron microscope, measuring 400 or more primary particles of silica observed within the field of view, and averaging the measurements.

[0105] The BET specific surface area of ​​silica is 100 m from the viewpoint of obtaining good durability. 2 / g, and preferably more than 130m 2 / g. On the other hand, it is more preferable that the 2 / g, and preferably less than 200m 2 It is more preferable that the BET specific surface area is less than N2SA / g. The BET specific surface area is the value of N2SA measured by the BET method in accordance with ASTM D3037-93.

[0106] Examples of silica include dry silica (anhydrous silica), wet silica (hydrated silica), and colloidal silica. Among them, wet silica is preferred because it contains water of hydration and a large number of silanol groups, and can effectively capture ozone. In addition, silica made from hydrated glass or silica made from biomass materials such as rice husks may also be used.

[0107] As silica, products available from Evonik Industries, Rhodia, Tosoh Silica, Solvay Japan, Tokuyama, etc. can be used.

[0108] In the rubber composition for treads, the content of silica 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 from the viewpoint of dispersibility in the rubber composition, preferably 150 parts by mass or less, more preferably 100 parts by mass or less.

[0109] The rubber composition for carcass and the rubber composition for sidewall may contain silica as necessary. In this case, in consideration of sufficient extrusion processability and ozone resistance, the content of silica per 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. Also, it is preferably 20 parts by mass or less, more preferably 15 parts by mass or less. By setting the silica content in this range, sufficient extrusion processability and ozone resistance can be obtained.

[0110] (iii) Silane coupling agent When silica is used as a filler, it is preferable to use a silane coupling agent in combination in order to increase the dispersibility of the silica and to improve the mechanical properties and moldability by reacting with the silica.

[0111] The silane coupling agent is not particularly limited, and examples thereof include bis(3-triethoxysilylpropyl)tetrasulfide, bis(2-triethoxysilylethyl)tetrasulfide, bis(4-triethoxysilylbutyl)tetrasulfide, bis(3-trimethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, bis(2-triethoxysilylethyl)trisulfide, bis(4-trimethoxysilylbutyl)trisulfide, and the like. Sulfide, bis(3-triethoxysilylpropyl) disulfide, bis(2-triethoxysilylethyl) disulfide, bis(4-triethoxysilylbutyl) disulfide, bis(3-trimethoxysilylpropyl) disulfide, bis(2-trimethoxysilylethyl) disulfide, bis(4-trimethoxysilylbutyl) disulfide, 3-trimethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 2-triethoxysilyl Examples of the silane coupling agent include sulfide-based agents such as ethyl-N,N-dimethylthiocarbamoyl tetrasulfide and 3-triethoxysilylpropyl methacrylate monosulfide, mercapto-based agents such as 3-mercaptopropyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, and NXT and NXT-Z manufactured by Momentive, vinyl-based agents such as vinyltriethoxysilane and vinyltrimethoxysilane, amino-based agents such as 3-aminopropyltriethoxysilane and 3-aminopropyltrimethoxysilane, glycidoxy-based agents such as γ-glycidoxypropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane, nitro-based agents such as 3-nitropropyltrimethoxysilane and 3-nitropropyltriethoxysilane, and chloro-based agents such as 3-chloropropyltrimethoxysilane and 3-chloropropyltriethoxysilane. Among these, silane coupling agents having a thiocarbonyl group such as the above-mentioned NXT are preferred. These agents may be used alone or in combination of two or more.

[0112] As the silane coupling agent, for example, products available from Evonik Industries, Momentive, Shin-Etsu Silicones, Tokyo Chemical Industry, Azumax, Dow Corning Toray, etc. can be used.

[0113] The content of the silane coupling agent is, for example, preferably more than 3 parts by mass, more preferably 5 parts by mass or more, relative to 100 parts by mass of silica, while it is preferably less than 15 parts by mass, more preferably 10 parts by mass or less.

[0114] (iv) Other fillers In addition to the above-mentioned carbon black and silica, 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. The content of these fillers is, for example, more than 0.1 part by mass and less than 150 parts by mass per 100 parts by mass of the rubber component.

[0115] (b) Plasticizer components In consideration of proper dispersion of powder materials during kneading, it is preferable to use a plasticizer component in each rubber composition as necessary. The plasticizer component here refers to a component that plasticizes the rubber composition, such as process oil, rubber component expander oil, liquid rubber, or resin component.

[0116] In this case, the content of the plasticizer component in each rubber composition per 100 parts by mass of the rubber component is preferably 2 parts by mass or more, and more preferably 5 parts by mass or more, and is preferably 20 parts by mass or less, and more preferably 15 parts by mass or less.

[0117] The plasticizer content includes the amount of oil contained in rubber (oil-extended rubber), etc.

[0118] (i) Oil The oil may be, for example, a mineral oil, a synthetic oil, a vegetable oil, an animal oil, or a mixture thereof.

[0119] Examples of mineral oils that can be used include paraffin-based, aromatic, and naphthenic oils, and examples of such products that can be used include those manufactured by Idemitsu Kosan Co., Ltd., Sankyo Yuka Kogyo Co., Ltd., ENEOS Corp., Orisoi Co., Ltd., H&R Corporation, Toyokuni Oil Mills Co., Ltd., Showa Shell Sekiyu K.K., and Fuji Kosan Co., Ltd. These may be used alone or in combination of two or more kinds.

[0120] From the viewpoint of life cycle assessment, lubricating oils used in the mixers and engines of rubber mixers and waste cooking oils used in restaurants and the like may be used after being appropriately refined.

[0121] Examples of vegetable oils include linseed oil, rapeseed oil, safflower oil, soybean oil, corn oil, cottonseed oil, rice oil, tall oil, sesame oil, perilla oil, castor oil, paulownia oil, pine oil, pine tar oil, sunflower oil, coconut oil, palm oil, palm kernel oil, olive oil, camellia oil, jojoba oil, macadamia nut oil, peanut oil, grapeseed oil, and wood wax.

[0122] Further examples of vegetable oils include refined oils (such as salad oils) obtained by refining the above oils, transesterified oils obtained by transesterification, hardened oils obtained by hydrogenation, thermally polymerized oils obtained by thermal polymerization, oxidatively polymerized oils obtained by oxidation, and waste edible oils obtained by recovering oils that have been used as edible oils, etc. The vegetable oils may be liquid or solid at room temperature (25°C). These may be used alone or in combination of two or more.

[0123] As the vegetable oil, acylglycerol is preferred, and triacylglycerol is more preferred. Incidentally, acylglycerol refers to a compound in which a hydroxyl group of glycerin and a carboxylic acid are ester-bonded. The acylglycerol is not particularly limited, and may be 1-monoacylglycerol, 2-monoacylglycerol, 1,2-diacylglycerol, 1,3-diacylglycerol, or triacylglycerol. Furthermore, the acylglycerol may be a monomer, a dimer, or a polymer of trimer or more. Incidentally, dimer or more acylglycerols can be obtained by thermal polymerization, oxidative polymerization, or the like. Also, the acylglycerol may be liquid or solid at room temperature (25°C).

[0124] The method for confirming whether or not acylglycerol is contained in the rubber composition is not particularly limited, but may be any of the following methods: 1 It can be confirmed by H-NMR measurement. For example, a rubber composition containing triacylglycerol is immersed in deuterated chloroform at room temperature (25°C) for 24 hours, the rubber composition is removed, and then 1H-NMR is measured at room temperature. When the signal of tetramethylsilane (TMS) is set to 0.00 ppm, signals are observed around 5.26 ppm, around 4.28 ppm, and around 4.15 ppm. These signals are presumed to be signals derived from hydrogen atoms bonded to carbon atoms adjacent to oxygen atoms of ester groups, and therefore the inclusion of acylglycerol can be confirmed. Here, "around" refers to a range of ±0.10 ppm.

[0125] 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.

[0126] As the vegetable oil, for example, commercially available oils from Idemitsu Kosan Co., Ltd., Sankyo Yuka Kogyo Co., Ltd., ENEOS Corporation, Orisoi Co., Ltd., H&R Corporation, Toyokuni Oil Mills Co., Ltd., Fuji Kosan Co., Ltd., Nisshin Oillio Group Co., Ltd., and the like can be used.

[0127] (ii) Liquid rubber Liquid rubber is a polymer that is in a liquid state at room temperature (25°C) and is a rubber component that can be extracted by acetone extraction from a vulcanized tire. Examples of liquid rubber include farnesene-based polymers, liquid diene-based polymers, and hydrogenated products thereof.

[0128] Farnesene polymers are polymers obtained by polymerizing farnesene and contain structural units based on farnesene. Farnesene has 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).

[0129] The farnesene-based polymer may be a homopolymer of farnesene (farnesene homopolymer) or a copolymer of farnesene and a vinyl monomer (farnesene-vinyl monomer copolymer).

[0130] Examples of the liquid diene polymer include liquid styrene-butadiene copolymer (liquid SBR), liquid butadiene polymer (liquid BR), liquid isoprene polymer (liquid IR), and liquid styrene-isoprene copolymer (liquid SIR).

[0131] The liquid diene polymer has a weight average molecular weight (Mw) of, for example, 1.0×10 3 Super, 2.0×10 5 Here, the Mw of the liquid diene polymer is a polystyrene-equivalent value measured by gel permeation chromatography (GPC).

[0132] The content of the liquid rubber (total content of the liquid farnesene-based polymer, liquid diene-based polymer, etc.) in each rubber composition is preferably, for example, more than 1 part by mass and less than 100 parts by mass per 100 parts by mass of the rubber component.

[0133] As the liquid rubber, for example, products of Kuraray Co., Ltd., Cray Valley Co., Ltd., etc. can be used.

[0134] (iii) Resin component The resin component also functions as a tackifier and may be solid or liquid at room temperature, and specific examples of the resin component include rosin resin, styrene resin, coumarone resin, terpene resin, C5 resin, C9 resin, C5C9 resin, acrylic resin, etc., and two or more of them may be used in combination. The content of the resin component in each rubber composition is preferably more than 2 parts by mass and less than 45 parts by mass, more preferably less than 30 parts by mass, per 100 parts by mass of the rubber component.

[0135] Rosin-based resins are resins whose main component is rosin acid obtained by processing rosin. These rosin-based resins (rosins) can be classified according to whether they have been modified or not, and can be classified into unmodified rosin (unmodified rosin) and modified rosin (rosin derivatives). Examples of unmodified rosins include tall rosin (also known as tall oil rosin), gum rosin, wood rosin, disproportionated rosin, polymerized rosin, hydrogenated rosin, and other chemically modified rosins. Modified rosin is a modification of unmodified rosin, and examples of such modified rosin include rosin esters, unsaturated carboxylic acid modified rosin esters, unsaturated carboxylic acid modified rosin esters, rosin amide compounds, and rosin amine salts.

[0136] The styrene resin is a polymer using a styrene monomer as a constituent monomer, and examples thereof include polymers polymerized with a styrene monomer as the main component (50% by mass or more).Specific examples thereof include homopolymers obtained by polymerizing each of the 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.) alone, copolymers obtained by copolymerizing two or more kinds of styrene monomers, and copolymers of a styrene monomer and another monomer that can be copolymerized therewith.

[0137] Examples of the other monomer include acrylonitriles such as acrylonitrile and methacrylonitrile, unsaturated carboxylic acids such as acrylics and methacrylic acid, unsaturated carboxylic acid esters such as methyl acrylate and methyl methacrylate, dienes such as chloroprene and butadiene-isoprene, olefins such as 1-butene and 1-pentene, α,β-unsaturated carboxylic acids or acid anhydrides thereof such as maleic anhydride, and the like.

[0138] Among the coumarone resins, coumarone-indene resins are preferred. Coumarone-indene resins are resins that contain coumarone and indene as monomer components that constitute the resin skeleton (main chain). Other monomer components contained in the skeleton besides coumarone and indene include styrene, α-methylstyrene, methylindene, vinyltoluene, etc.

[0139] The content of the coumarone-indene resin in each rubber composition is, for example, preferably more than 1.0 part by mass and less than 50.0 parts by mass per 100 parts by mass of the rubber component.

[0140] The hydroxyl value (OH value) of the coumarone-indene resin is, for example, more than 15 mgKOH / g and less than 150 mgKOH / g. The OH value is the amount of potassium hydroxide required to neutralize acetic acid bonded to hydroxyl groups when acetylating 1 g of the resin, expressed in milligrams, and is a value measured by potentiometric titration (JIS K 0070:1992).

[0141] The softening point of the coumarone-indene resin is, for example, more than 30° C. and less than 160° C. The softening point is the temperature at which the ball drops when the softening point specified in JIS K 6220-1:2001 is measured using a ring and ball softening point tester.

[0142] Terpene resins include polyterpene, terpene phenol, and aromatic modified terpene resins. Polyterpenes are resins obtained by polymerizing terpene compounds and their hydrogenated products. Terpene compounds are (C5H8) nThe hydrocarbons and their oxygen-containing derivatives are represented by the following composition: Monoterpenes (C 10 H 16 ), sesquiterpenes (C 15 H 24 ), diterpenes (C 20 H 32 ), and examples thereof include 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, and γ-terpineol.

[0143] Examples of polyterpenes include terpene resins such as α-pinene resin, β-pinene resin, limonene resin, dipentene resin, and β-pinene / limonene resin, which are made from the above-mentioned terpene compounds, as well as hydrogenated terpene resins obtained by hydrogenating the terpene resins. Examples of terpene phenols include resins obtained by copolymerizing the above-mentioned terpene compounds with phenolic compounds, and resins obtained by hydrogenating the above-mentioned resins, and specifically include resins obtained by condensing the above-mentioned terpene compounds, phenolic compounds, and formalin. Examples of phenolic compounds include, for example, phenol, bisphenol A, cresol, and xylenol. Examples of aromatic modified terpene resins include resins obtained by modifying terpene resins with aromatic compounds, and resins obtained by hydrogenating the above-mentioned resins. The aromatic compound is not particularly limited as long as it is a compound having an aromatic ring, and examples thereof include phenolic compounds such as phenol, alkylphenols, alkoxyphenols, and phenols containing an unsaturated hydrocarbon group; naphthol compounds such as naphthol, alkylnaphthols, alkoxynaphthols, and naphthols containing an unsaturated hydrocarbon group; styrene derivatives such as styrene, alkylstyrenes, alkoxystyrenes, and styrenes containing an unsaturated hydrocarbon group; coumarone, indene, and the like.

[0144] "C5 resin" refers to a resin obtained by polymerizing a C5 fraction. Examples of C5 fractions include petroleum fractions having 4 to 5 carbon atoms, such as cyclopentadiene, pentene, pentadiene, and isoprene. As a C5 petroleum resin, dicyclopentadiene resin (DCPD resin) is preferably used.

[0145] The term "C9 resin" refers to a resin obtained by polymerizing a C9 fraction, and may be a resin obtained by hydrogenating or modifying the resin. Examples of C9 fractions include petroleum fractions having 8 to 10 carbon atoms, such as vinyltoluene, alkylstyrene, indene, and methylindene. Specific examples of suitable resins include coumarone-indene resins, coumarone resins, indene resins, and aromatic vinyl resins. As aromatic vinyl resins, α-methylstyrene (AMS resin) or homopolymers of styrene or copolymers of α-methylstyrene and styrene are preferred, and copolymers of α-methylstyrene and styrene are more preferred, because they are economical, easy to process, and have excellent heat generation properties. As aromatic vinyl resins, for example, those commercially available from Kraton, Eastman Chemical, etc. can be used.

[0146] The term "C5C9 resin" refers to a resin obtained by copolymerizing the C5 fraction and the C9 fraction, and may be a hydrogenated or modified resin. Examples of the C5 fraction and the C9 fraction include the petroleum fractions. As the C5C9 resin, for example, those commercially available from Tosoh Corporation, LUHUA, etc. can be used.

[0147] The acrylic resin is not particularly limited, but for example, a solventless acrylic resin can be used.

[0148] Examples of the solvent-free acrylic resin include (meth)acrylic resins (polymers) synthesized by high-temperature continuous polymerization (high-temperature continuous bulk polymerization) (methods described in U.S. Pat. No. 4,414,370, JP-A-59-6207, JP-B-5-58005, JP-A-1-313522, U.S. Pat. No. 5,010,166, and Toa Gosei Kenkyuu Nenpo TREND 2000 Vol. 3, p. 42-45, etc.) using as little secondary raw material as possible, such as polymerization initiators, chain transfer agents, and organic solvents. In the present invention, (meth)acrylic means methacryl and acrylic.

[0149] Examples of monomer components constituting the acrylic resin include (meth)acrylic acid, (meth)acrylic acid esters (alkyl esters, aryl esters, aralkyl esters, etc.), (meth)acrylamide, and (meth)acrylic acid derivatives such as (meth)acrylamide derivatives.

[0150] In addition, aromatic vinyls such as styrene, α-methylstyrene, vinyltoluene, vinylnaphthalene, divinylbenzene, trivinylbenzene, and divinylnaphthalene may be used together with (meth)acrylic acid or a (meth)acrylic acid derivative as a monomer component constituting the acrylic resin.

[0151] The acrylic resin may be a resin composed only of a (meth)acrylic component, or a resin containing components other than the (meth)acrylic component as constituent elements. The acrylic resin may have a hydroxyl group, a carboxyl group, a silanol group, or the like.

[0152] Examples of the resin component that can be used include products from Maruzen Petrochemical Co., Ltd., Sumitomo Bakelite Co., Ltd., Yasuhara Chemical Co., Ltd., Tosoh Corporation, Rutgers Chemicals, BASF, Clayton Chemicals, Nippon Paint Chemical Co., Ltd., Nippon Shokubai Co., Ltd., ENEOS Corporation, Arakawa Chemical Industries, Ltd., and Taoka Chemical Co., Ltd.

[0153] (C) Hardening resin component Each rubber composition has a high E * In order to suppress the change in the heat resistance, it is preferable to contain a curable resin component such as a modified resorcinol resin or a modified phenolic resin as a heat resistance improver.

[0154] Specific examples of modified resorcinol resins include Sumikanol 620 (modified resorcinol resin) manufactured by Taoka Chemical Co., Ltd., and examples of modified phenolic resins include PR12686 (cashew oil modified phenolic resin) manufactured by Sumitomo Bakelite Co., Ltd.

[0155] The content of the curable resin component is, for example, preferably 1 part by mass or more, more preferably 2 parts by mass or more, based on 100 parts by mass of the rubber component, from the viewpoint of sufficiently improving the complex elastic modulus and obtaining a large reaction force during deformation, while the content is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, based on the viewpoint of maintaining the breaking strength.

[0156] When using the modified resorcinol resin, it is preferable to contain a methylene donor as a curing agent. Examples of methylene donors include hexamethylenetetramine (HMT), hexamethoxymethylolmelamine (HMMM), and hexamethylolmelamine pentamethylether (HMMPME), and the like are preferably contained in an amount of, for example, 5 parts by mass or more, and about 15 parts by mass, per 100 parts by mass of the curable resin component. If the amount is too small, there is a risk that a sufficient complex modulus cannot be obtained. On the other hand, if the amount is too large, there is a risk that the viscosity of the rubber increases and the processability deteriorates.

[0157] As a specific example of the methylene donor, Sumikanol 507 manufactured by Taoka Chemical Co., Ltd. can be used.

[0158] (D) Lubricant (stearic acid) Each rubber composition may contain a lubricant. As the lubricant, a lubricant based on a fatty acid derivative such as stearic acid can be preferably used. As the stearic acid, a conventionally known one 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 Co., Ltd. can also be used.

[0159] The amount of stearic acid per 100 parts by mass of the rubber component is, for example, preferably more than 0.5 parts by mass and less than 10.0 parts by mass.

[0160] (e) Anti-aging agents Each rubber composition may contain an antioxidant. The content of the antioxidant is, for example, more than 1 part by mass and less than 10 parts by mass per 100 parts by mass of the rubber component.

[0161] Examples of the antioxidant include naphthylamine-based antioxidants such as phenyl-α-naphthylamine; diphenylamine-based antioxidants such as octylated diphenylamine and 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine; N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, and N,N'-di-2-naphthyl-p-phenylenediamine. p-phenylenediamine-based antioxidants such as quinolinone, quinoline-based antioxidants such as polymers of 2,2,4-trimethyl-1,2-dihydroquinoline, monophenol-based antioxidants such as 2,6-di-t-butyl-4-methylphenol and styrenated phenol, and bis-, tris-, and polyphenol-based antioxidants such as tetrakis-[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane. These may be used alone or in combination of two or more.

[0162] Specific examples of the antioxidant that can be used include products manufactured by Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Industry Co., Ltd., Flexis, and the like.

[0163] (F) Zinc oxide Each rubber composition may contain zinc oxide. The content of zinc oxide is, for example, more than 0.5 parts by mass and less than 10 parts by mass with respect to 100 parts by mass of the rubber component. As the zinc oxide, a conventionally known product can be used, for example, a product of Mitsui Mining & Smelting Co., Ltd., Toho Zinc Co., Ltd., Hakusui Tech Co., Ltd., Seido Chemical Industry Co., Ltd., Sakai Chemical Industry Co., Ltd., etc. can be used.

[0164] (G) 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 further preferably 1.5 to 10 parts by mass, based on 100 parts by mass of the rubber component.

[0165] The wax is not particularly limited, and examples thereof include petroleum waxes such as paraffin wax and microcrystalline wax, natural waxes such as vegetable wax and animal wax, synthetic waxes such as polymers of ethylene, propylene, etc. These may be used alone or in combination of two or more kinds.

[0166] As the wax, for example, products from Ouchi Shinko Chemical Industry Co., Ltd., Nippon Seiro Co., Ltd., Seiko Chemical Co., Ltd., etc. can be used.

[0167] (H) Crosslinking agents and vulcanization accelerators Each rubber composition preferably contains a crosslinking agent such as sulfur. The content of the crosslinking agent is, for example, more than 0.1 parts by mass and less than 10.0 parts by mass per 100 parts by mass of the rubber component. The sulfur content is the pure sulfur content, and in the case of using insoluble sulfur, it is the content excluding the oil content.

[0168] Examples of sulfur include powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, soluble sulfur, etc., which are commonly used in the rubber industry. These may be used alone or in combination of two or more kinds.

[0169] As sulfur, for example, products from Tsurumi Chemical Industry Co., Ltd., Karuizawa Sulfur Co., Ltd., Shikoku Chemical Industry Co., Ltd., Flexis Corporation, Nippon Kanritsu Kogyo Co., Ltd., Hosoi Chemical Industry Co., Ltd., etc. can be used.

[0170] Crosslinking agents other than sulfur may also be used. Specifically, for example, vulcanizing agents containing sulfur atoms such as TACKIROL V200 manufactured by Taoka Chemical Co., Ltd., DURALINK HTS (sodium 1,6-hexamethylenedithiosulfate dihydrate) manufactured by Flexis, and KA9188 (1,6-bis(N,N'-dibenzylthiocarbamoyldithio)hexane: hybrid crosslinking agent) manufactured by LANXESS, and organic peroxides such as dicumyl peroxide can be used.

[0171] Each rubber composition preferably contains a vulcanization accelerator. The content of the vulcanization accelerator is, for example, more than 0.3 parts by mass and less than 10.0 parts by mass per 100 parts by mass of the rubber component.

[0172] Examples of the vulcanization accelerator include thiazole-based vulcanization accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide, and N-cyclohexyl-2-benzothiazyl 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, Nt-butyl-2-benzothiazolyl sulfenamide, N-oxyethylene-2-benzothiazole sulfenamide, N-oxyethylene-2-benzothiazole sulfenamide, and N,N'-diisopropyl-2-benzothiazole sulfenamide; and guanidine-based vulcanization accelerators such as diphenyl guanidine, di-orthotolyl guanidine, and orthotolyl biguanidine. These may be used alone or in combination of two or more kinds.

[0173] (R) Other In addition to the above-mentioned components, each rubber composition may contain additives commonly used in the tire industry, such as organic fillers such as cellulose fibers, fatty acid metal salts, carboxylate metal salts, organic peroxides, etc. The content of these additives is, for example, more than 0.1 parts by mass and less than 50 parts by mass per 100 parts by mass of the rubber component.

[0174] (N) Carcass cord Although it is not a compounding material of the rubber composition, the carcass cord will be described. For the carcass cord, a cord made of a material such as aramid, PET, nylon 6, nylon 6,6, rayon, etc. is used, and among them, a cord made of aramid or PET is preferably used. In this embodiment, the fineness of the carcass cord is preferably 900 dtex or more and 2500 dtex or less. The fineness of the carcass cord refers to the weight (g) per 1000 m of the carcass cord, and is measured from the carcass cord extracted from the tire.

[0175] The thickness of the carcass cord is preferably 0.3 mm or more, more preferably 0.5 mm or more, and is preferably 1.2 mm or less, more preferably 1 mm or less. The thickness of the carcass cord refers to the diameter of a circumscribing circle in a cross section perpendicular to the longitudinal direction of the carcass cord.

[0176] The number of twists in the carcass cord is preferably 20 or more, and more preferably 30 or more, and is preferably 60 or less, and more preferably 40 or less. The number of twists in the carcass cord refers to the number of twists (turns / 10 cm) per 10 cm in the longitudinal direction of the organic fiber cord in the tire.

[0177] The number of ends of the carcass cord is preferably 10 or more, and more preferably 30 or more, and is preferably 100 or less, and more preferably 50 or less. The number of ends of the carcass cord refers to the number of ends per 50 mm in the arrangement direction in a cross section perpendicular to the longitudinal direction of the carcass cord.

[0178] In addition, in each rubber composition, the loss tangent (tan δ) can be adjusted by adjusting the amount of carbon black, sulfur, etc., so that the target loss tangent (tan δ) can be achieved without the need for excessive trial and error.

[0179] And the complex modulus (E * The complex modulus (E) can be adjusted by adjusting the amount of the curable resin component. The amount of carbon black and sulfur can also be adjusted. * Specifically, the complex modulus (E * However, increasing the amount of carbon black increases the heat generation property, while increasing the amount of sulfur decreases the heat generation property. Therefore, it is preferable to adopt a method in which first, after determining whether or not to use a curable resin component and the blending amount, the amount of sulfur is adjusted, and finally the amount of carbon black is adjusted. This makes it possible to obtain the desired complex modulus of elasticity (E * ) can be achieved.

[0180] In addition, the breaking elongation S (%) of the carcass cord can be controlled to a desired value using known methods, such as by increasing the number of twists of the cord (i.e., increasing the twist angle of the cord) or by changing the thickness of the cord.

[0181] (2) Preparation of each rubber composition Each rubber composition can be prepared by a general method, for example, a manufacturing method including a base kneading step of kneading a rubber component with a filler such as carbon black, and a finish kneading step of kneading the mixture obtained in the base kneading step with a crosslinking agent.

[0182] The kneading can be carried out using a known (internal) kneading machine such as a Banbury mixer, a kneader, or an open roll.

[0183] The kneading temperature in the base kneading step is, for example, more than 50° C. and less than 200° C., and the kneading time is, for example, more than 30 seconds and less than 30 minutes. In the base 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 necessary.

[0184] In the final kneading step, the kneaded product obtained in the base kneading step is kneaded with a crosslinking agent. The kneading temperature in the final kneading step is, for example, higher than room temperature and lower than 80° C., and the kneading time is, for example, longer than 1 minute and shorter than 15 minutes. In the final kneading step, in addition to the above components, a vulcanization accelerator, zinc oxide, etc. may be appropriately added and kneaded as necessary.

[0185] The obtained rubber composition for tread and the rubber composition for sidewall can then be molded into a tread and a sidewall, respectively, by extrusion into a predetermined shape, and the rubber composition for carcass can be topped (coated) on a carcass cord and extruded into a predetermined shape to be molded into a carcass.

[0186] 3. Tire manufacturing The tire according to the present embodiment can be manufactured by a normal method, except that the electronic parts are embedded during the molding process. First, the rubber compositions obtained above are molded into a predetermined shape to manufacture the sidewall, tread, and carcass. Next, the rubber compositions are combined with other rubber components on a tire building machine to manufacture an unvulcanized tire.

[0187] Specifically, an inner liner as a member for ensuring airtightness of the tire, a carcass as a member for enduring the load, impact, and filling air pressure received by the tire, and a belt member as a member for tightening the carcass and increasing the rigidity of the tread are wound around a forming drum, both ends of the carcass are fixed to both side edges, and beads as members for fixing the tire to the rim are arranged, and after forming into a toroidal shape, a tread is attached to the center of the outer periphery and a sidewall is attached to the radially outer side to form the side portion, thereby producing an unvulcanized tire. During this unvulcanized tire production process, electronic components are embedded in predetermined positions.

[0188] The unvulcanized tire thus produced is then heated and pressurized in a vulcanizer to obtain a tire. The vulcanization step can be carried out by applying a known vulcanization method. The vulcanization temperature is, for example, more than 120°C and less than 200°C, and the vulcanization time is, for example, more than 5 minutes and less than 15 minutes.

[0189] As described above, the obtained tire has electronic components between overlapping carcass layers to reduce the amount of deformation around the electronic components, and by appropriately controlling (S / L) to 0.125 or more, the occurrence of minute friction is suppressed, thereby suppressing breakage and damage to the electronic components, thereby improving the durability of the tire with electronic components attached while it is in motion.

[0190] The tire according to the present invention can be suitably used as a passenger car tire, a large passenger car tire, a large SUV tire, a truck / bus tire, a motorcycle tire, a racing tire, a studless tire (winter tire), an all-season tire, a run-flat tire, etc., and is particularly preferably used as a passenger car tire. EXAMPLES

[0191] Below, examples (embodiments) that are considered to be preferable for carrying out the present invention will be shown, but the scope of the present invention is not limited to these examples.

[0192] We studied tires (tire sizes 195 / 65R15 (Study 1), 155 / 60R16 (Study 2), and 215 / 50R17 (Study 3)) made of sidewall rubber compositions, tread rubber compositions, and carcass rubber compositions based on the various compounding materials and Tables 1 to 3 shown below, as well as sidewalls, treads, carcasses (topped with the cords shown in Table 4), and other rubber components, and the results are shown in Tables 5 to 10.

[0193] 1. Preparation of each rubber composition Using various compounding materials shown below, a rubber composition for a sidewall, a rubber composition for a tread, and a rubber composition for a carcass are prepared.

[0194] (1) Compounding materials (a) Rubber component (a) NR: TSR20 (b) SBR: SBR1502 manufactured by ENEOS Materials Corporation (styrene content: 23.5% by mass, vinyl content: 16% by mass, not oil extended) (c) BR: UBEPOL BR150B (high sys BR) manufactured by Ube Industries (Mw: 440,000, cis-1,4 bond content: 96% by mass)

[0195] (b) Compounding materials other than rubber components (a) Carbon black-1: Showblack N220 manufactured by Cabot Japan (b) Carbon black-2: Showblack N330 manufactured by Cabot Japan Co., Ltd. (c) Carbon black-3: Show Black N550 manufactured by Cabot Japan (d) Silica: Ultrasil VN3 manufactured by Eponic Industries (N2SA:175m 2 / g, average primary particle diameter: 17nm) (e) Silane coupling agent: Si266 manufactured by Eponic Industries (Bis(3-triethoxysilylpropyl) disulfide) (F) Resin-1: Sumikanol 620 manufactured by Taoka Chemical Industry Co., Ltd. (Modified resorcinol-formaldehyde resin) (G) Resin-2: Sumikanol 507AP manufactured by Taoka Chemical Industry Co., Ltd. (Methylated formaldehyde-melamine polymer) (H) Resin-3: Tosoh Petrotac 100V (C5C9 petroleum resin, softening point 96℃) (R) Resin-4: Sylvatraxx 4401 manufactured by Kraton (α-methylstyrene resin) (J) Wax: OZOACE-0355 manufactured by Nippon Seiro Co., Ltd. (K) Anti-aging agent-1: Nocrac 6C manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (N-(1,3 dimethylbutyl)-N´-phenyl-p-phenylenediamine) (O) Anti-aging agent-2: Nocrac RD manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (Poly(2,2,4-trimethyl-1,2-dihydroquinoline)) (Wa) Oil: Diana Process AH-24 (aroma oil) manufactured by Idemitsu Kosan (F) Stearic acid: NOF Corp. bead stearic acid "Tsubaki" (Y) Zinc oxide: Zinc oxide No. 1 manufactured by Mitsui Mining & Smelting Co., Ltd. (T) Sulfur: Powdered sulfur manufactured by Karuizawa Sulfur Co., Ltd. (R) Accelerator-1: Noccela NS manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (N-tert-butyl-2-benzothiazolyl sulfenamide (TBBS)) (S) Accelerator-2: Noccela MP (M) manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (2-Mercaptobenzothiazole) (T) Accelerator-2: Noccela D (DP) manufactured by Ouchi Shinko Chemical Industry Co., Ltd. (1,3-Diphenylguanidine (DPG))

[0196] (2) Rubber composition for sidewall According to the composition shown in Table 1, materials other than sulfur and vulcanization accelerator are kneaded for 5 minutes under the condition of 150°C using a Banbury mixer to obtain a kneaded mixture. The amounts of each ingredient are in parts by mass.

[0197] Next, sulfur and a vulcanization accelerator are added to the kneaded mixture, and the mixture is kneaded for 5 minutes under the condition of 80° C. using an open roll to obtain rubber compositions for sidewalls SW-1 to SW-6.

[0198] [Table 1]

[0199] (3) Preparation of rubber composition for tread In parallel, based on each formulation shown in Table 2, rubber compositions for treads TR1 to TR5 are obtained in the same manner as in the preparation of the rubber composition for sidewalls.

[0200] [Table 2]

[0201] 2. Sidewall and tread molding Next, each of the obtained rubber compositions is molded into a sidewall and a tread having a predetermined shape.

[0202] Of the physical properties listed in Tables 1 and 2, 70°C tan δ, 30°C tan δ, and 0°C tan δ were measured using test pieces cut from each tire to have dimensions of 20 mm length x 4 mm width x 1 mm thickness, under conditions of a frequency of 10 Hz, initial strain of 5%, dynamic strain rate of 1%, and deformation mode: tensile, at temperatures of 70°C, 30°C, and 0°C, respectively, using an "IPLEXER (registered trademark)" manufactured by GABO.

[0203] Also, 70℃ * The test piece prepared in the same manner is measured using GABO's "IPLEXER (registered trademark)" under the conditions of temperature 70°C, frequency 10 Hz, initial strain 5%, dynamic strain rate 1%, and deformation mode: tension.

[0204] When preparing the test specimen, the length direction of the test specimen shall coincide with the circumferential direction. Furthermore, the thickness direction of the test specimen shall coincide with the radial direction of the tire in the case of the tread, and shall be parallel to the line L in the case of the sidewall. When the thickness of each component is less than 1 mm, a test specimen of a certain thickness shall be taken from the thickest place on the tire equatorial plane of the component. For example, when measuring an inner liner with a thickness of 2 mm on the tire equatorial plane, a test specimen with a length of 20 mm x width of 4 mm x thickness of 1 mm shall be used, and when measuring an inner liner with a thickness of 0.5 mm on the tire equatorial plane, a test specimen with a length of 20 mm x width of 4 mm x thickness of 0.5 mm shall be used.

[0205] 3. Carcass Forming In parallel, carcass rubber compositions CA-a and CA-b are obtained based on the respective formulations shown in Table 3 in the same manner as in the preparation of the sidewall rubber composition.

[0206] [Table 3]

[0207] Next, each of the obtained rubber compositions is topped on both sides of a cord (CA-1, CA-2, CA-3) shown in Table 4, and molded into a predetermined shape to prepare a carcass.

[0208] [Table 4]

[0209] Among the physical properties shown in Table 4, the breaking elongation of the cord refers to the elongation percentage of the sample cord measured at the time of cord breakage. A cord (sample cord) is removed from each test tire, and immediately after removal, the sample cord is set between a pair of gripping tools of an autograph so that the cord is straight without slack, and measurement is performed under conditions of a gripping distance of 250 mm and a pulling speed of 300 mm / min in accordance with the method specified in JIS L1017:2002.

[0210] The cord fineness is calculated by extracting a cord of 10 cm or more from the tire, removing the rubber covering layer attached around the extracted cord, calculating the weight per 1000 m, and averaging the values ​​calculated for 10 cords. Note that 1100 / 2 in Table 4 means that two cords of 1100 tex fineness are twisted together. Furthermore, the cord thickness and the number of twists are calculated from the tire.

[0211] 4. Tire manufacturing Next, the sidewall, tread, and carcass obtained above are laminated together with other tire components in the combinations shown in Tables 5 to 10 to form an unvulcanized tire, and the unvulcanized tire is press-vulcanized for 10 minutes under a condition of 170°C to produce each test tire shown in Tables 5 to 10.

[0212] When forming an unvulcanized tire, an electronic component (RFID) having the size (weight W (g) and longitudinal length L (mm)) shown in Tables 5 to 10 is embedded in the embedding position shown in Tables 5 to 10. 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 also provided.

[0213] In Tables 5 to 10, embedding position 1 indicates that the electronic component is embedded between the carcass layer on the inner side in the tire width direction and the carcass layer on the outer side near the maximum width portion (see FIG. 1), embedding position 2 indicates that the electronic component is embedded between the carcass layer on the inner side in the tire width direction and the carcass layer on the ground contact surface side of the maximum width portion (see FIG. 3), embedding position 3 indicates that the electronic component is embedded further inside the carcass layer on the inner side in the tire width direction near the maximum width portion (see FIG. 4), and embedding position 4 indicates that the electronic component is embedded further outside the carcass layer on the outer side in the tire width direction near the maximum width portion (see FIG. 5).

[0214] 5. Calculation of parameters Next, for each test tire (different from the tire from which the test specimens are taken), the tire weight (kg), section height H (mm), and outer diameter Dt (mm) are measured, and the maximum load capacity (kg) is calculated based on these. D is also measured.

[0215] And, S / L, tire weight / maximum load capacity, S×D, (S / 70℃E * Calculate (70°C tan δSW×L) / S, D×W, and (70°C tan δSW×L) / S.

[0216] 6. Performance evaluation test (evaluation of the durability of electronic components while the tire is running) (1) Test method Each test tire is fitted to all wheels of a vehicle (a domestically produced FF vehicle with an engine displacement of 2000cc), and the vehicle is inflated with air to an internal pressure of 230kPa. The vehicle is then driven overloaded on a test course. Before driving, the driver performs a reading test of the electronic components to check the reading performance. The test is repeated by driving over a protrusion on the road surface and stopping to check the reading performance. The driving speed is gradually increased from 50km / h, and the speed of the driving test immediately before any abnormality is noticed in the reading performance when stopped is recorded.

[0217] (2) Evaluation method Next, the results of Comparative Example 1 (Comparative Example 1-1, Comparative Example 2-1, Comparative Example 3-1) for each study were set as 100, and indexed based on the following formula to evaluate the durability of the tire while it was running. A larger value indicates better durability of the electronic parts while the tire was running. Durability of electronic components when tires are in motion = [(Test tire results) / (Comparative example 1 results)]×100

[0218] [Table 5]

[0219] [Table 6]

[0220] [Table 7]

[0221] [Table 8]

[0222] [Table 9]

[0223] [Table 10]

[0224] Although the present invention has been described above based on the embodiment, the present invention is not limited to the above embodiment. Various modifications can be made to the above embodiment within the same and equivalent scope of the present invention.

[0225] The present invention (1) is A tire having a tread portion, a carcass layer, and a sidewall portion, An electronic component is provided between the overlapping carcass layers, The breaking elongation S (%) of the cord constituting the carcass layer; The tire is characterized in that the longitudinal length L (mm) of the electronic component satisfies the following (Formula 1). S / L≧0.125 (Formula 1)

[0226] The present invention (2) is The tire according to the present invention (1) is characterized in that the loss tangent 30°C tan δTR of the tread portion measured under conditions of a temperature of 30°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, in a deformation mode of tension, is 0.25 or less.

[0227] The present invention (3) is The tire according to the present invention (2) is characterized in that the loss tangent 30°C tan δTR of the tread portion measured under conditions of a temperature of 30°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, in a deformation mode of tension, is 0.15 or less.

[0228] The present invention (4) is The tire according to the present invention (2) or (3) is characterized in that the loss tangent (0°C tan δTR) of the tread portion measured 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%, in a deformation mode of tension, is 0.50 or more.

[0229] The present invention (5) is Tire weight (kg) and The tire is characterized in that the maximum load capacity (kg) of the tire satisfies the following (Formula 2), and is an arbitrary combination with any of the present inventions (1) to (4). Tire weight / Maximum load capacity<0.0150 (Equation 2)

[0230] The present invention (6) is Tire weight (kg) and The tire is characterized in that the maximum load capacity (kg) of the tire satisfies the following (Formula 3), and is a tire described in the present invention (5). Tire weight / Maximum load capacity<0.0135 (Equation 3)

[0231] The present invention (7) is The breaking elongation S (%) of the cord constituting the carcass layer; The shortest distance D (mm) from the electronic component to the outer surface of the tire satisfies the following formula 4, and the tire is any combination with any of the present inventions (1) to (6). S×D≧10 (Formula 4)

[0232] The present invention (8) is The breaking elongation S (%) of the cord constituting the carcass layer; The complex elastic modulus of the sidewall part measured under the conditions of temperature 70°C, frequency 10Hz, initial strain 5%, dynamic strain rate 1%, deformation mode: tension 70°C E * SW (MPa) and The tire is characterized in that the longitudinal length L (mm) of the electronic component satisfies the following (Formula 5), ​​and is an arbitrary combination with any of the present inventions (1) to (7). (S / 70℃E * SW) / L≧0.025 (Formula 5)

[0233] The present invention (9) is The loss tangent 70°C tan δSW of the sidewall portion measured under the conditions of a temperature of 70°C, a frequency of 10Hz, an initial strain of 5%, and a dynamic strain rate of 1%, in a deformation mode: tension; The tire is characterized in that the longitudinal length L (mm) of the electronic component satisfies the following (Formula 6), and is an optional combination with any of the present inventions (1) to (8). 70℃tanδSW×L≦12 (Formula 6)

[0234] The present invention (10) is The longitudinal length L (mm) of the electronic component; The loss tangent 70°C tan δSW of the sidewall portion measured under the conditions of a temperature of 70°C, a frequency of 10Hz, an initial strain of 5%, and a dynamic strain rate of 1%, in a deformation mode: tension; The tire is characterized in that the breaking elongation S (%) of the cord constituting the carcass layer satisfies the following (Formula 7), and is any combination with any of the present inventions (1) to (9). (70℃tanδSW×L) / S≦1.2 (Formula 7)

[0235] The present invention (11) is The weight W (g) of the electronic component; The shortest distance D (mm) from the electronic component to the outer surface of the tire satisfies the following formula 8, and the tire is any combination with any of the present inventions (1) to (10). D×W≦2.5 (Formula 8)

[0236] The present invention (12) is The tire is characterized in that the electronic component is an RFID tag or a sensor, and is any combination with any of the present inventions (1) to (11).

[0237] The present invention (13) is The tire is characterized in that an adhesive layer or a plating layer is provided on the surface of the electronic component to improve adhesion to rubber, and is any combination with any of the present inventions (1) to (12).

[0238] The present invention (14) is The tire is characterized in that an electronic part covering layer having a thickness of 0.5 mm or more for covering the electronic parts is provided, and is any combination with any of the present inventions (1) to (13).

[0239] The present invention (15) is The tire is characterized in that the longitudinal length L (mm) of the electronic component is 80 mm or less, and is any combination with any of the present inventions (1) to (14).

[0240] The present invention (16) is The tire according to the present invention (15), characterized in that the length L (mm) of the electronic component in the longitudinal direction is 50 mm or less.

[0241] The present invention (17) is The electronic component is disposed radially inward from the maximum width of the tire and at a position 25 mm or more away from the lower end of the bead core, and the tire is any combination with any of the present inventions (1) to (16).

[0242] The present invention (18) is The tire is characterized in that the cord constituting the carcass layer has a fineness of 900 dtex or more and 2500 dtex or less, and is any combination with any of the present inventions (1) to (17). [Explanation of symbols]

[0243] 1 Tire 2 Bead section 3 Sidewall 4 Tread section 21 Bead core 22 Bead Apex 23 Clinch 24 Chafer 31 Sidewall 32 Carcass layer 33 Inner Liner 34 Electronic Components 34a Main unit 34b Antenna L: Longitudinal length of electronic component

Claims

1. A tire having a tread portion, a carcass layer, and a sidewall portion, An electronic component is provided between the overlapping carcass layers, The breaking elongation S (%) of the cord constituting the carcass layer; A tire characterized in that the longitudinal length L (mm) of the electronic component satisfies the following (Formula 1). S / L≧0.125 (Formula 1)

2. 2. The tire according to claim 1, wherein the loss tangent 30° C. tan δTR of the tread portion measured under conditions of a temperature of 30° C., a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, in a deformation mode of tension, is 0.25 or less.

3. The tire according to claim 2, characterized in that the loss tangent 30°C tan δTR of the tread portion measured under conditions of a temperature of 30°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, in a deformation mode of tension, is 0.15 or less.

4. 4. The tire according to claim 2 or 3, wherein a loss tangent 0° C. tan δTR of the tread portion measured under conditions of a temperature of 0° C., a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, in a deformation mode of tension, is 0.50 or more.

5. Tire weight (kg), The tire according to any one of claims 1 to 4, characterized in that the maximum load capacity (kg) of the tire satisfies the following (Equation 2). Tire weight / maximum load capacity<0.0150 (Equation 2)

6. Tire weight (kg), The tire according to claim 5, characterized in that the maximum load capacity (kg) of the tire satisfies the following (Equation 3). Tire weight / maximum load capacity<0.0135 (Equation 3)

7. The breaking elongation S (%) of the cord constituting the carcass layer; The tire according to any one of claims 1 to 6, characterized in that a shortest distance D (mm) from the electronic component to an outer surface of the tire satisfies the following (Equation 4): S×D≧10 (Formula 4)

8. The breaking elongation S (%) of the cord constituting the carcass layer; The complex elastic modulus of the sidewall portion measured under the conditions of a temperature of 70° C., a frequency of 10 Hz, an initial strain of 5%, a dynamic strain rate of 1%, and a deformation mode of tension. ＊ SW (MPa); The tire according to any one of claims 1 to 7, characterized in that the longitudinal length L (mm) of the electronic component satisfies the following (Equation 5): (S / 70 °C E ＊ SW) / L ≥ 0.025 (Equation 5)

9. The loss tangent 70°C tan δSW of the sidewall portion measured under the conditions of a temperature of 70°C, a frequency of 10Hz, an initial strain of 5%, and a dynamic strain rate of 1%, in a deformation mode: tension; The tire according to any one of claims 1 to 8, characterized in that the longitudinal length L (mm) of the electronic component satisfies the following (Formula 6): 70℃tanδSW×L≦12 (Formula 6)

10. The longitudinal length L (mm) of the electronic component; The loss tangent 70°C tan δSW of the sidewall portion measured under the conditions of a temperature of 70°C, a frequency of 10Hz, an initial strain of 5%, and a dynamic strain rate of 1%, in a deformation mode: tension; The tire according to any one of claims 1 to 8, characterized in that the breaking elongation S (%) of the cord constituting the carcass layer satisfies the following (Equation 6). (70℃tanδSW×L) / S≦1.2 (Formula 7)

11. The weight W (g) of the electronic component; The tire according to any one of claims 1 to 10, characterized in that a shortest distance D (mm) from the electronic component to an outer surface of the tire satisfies the following (Equation 8). D×W≦2.5 (Formula 8)

12. The tire according to any one of claims 1 to 11, characterized in that the electronic component is an RFID tag or a sensor.

13. 13. The tire according to claim 1, wherein an adhesive layer or a plating layer is provided on a surface of the electronic component to improve adhesion to rubber.

14. The tire according to any one of claims 1 to 13, further comprising an electronic component covering layer having a thickness of 0.5 mm or more for covering the electronic components.

15. 15. The tire according to claim 1, wherein the electronic component has a length L (mm) in a longitudinal direction of 80 mm or less.

16. 16. The tire according to claim 15, wherein the length L (mm) of the electronic component in the longitudinal direction is 50 mm or less.

17. 17. The tire according to claim 1, wherein the electronic component is disposed radially inward of the maximum width of the tire and at a position 25 mm or more away from a lower end portion of the bead core.

18. 18. The tire according to claim 1, wherein the cord constituting the carcass layer has a fineness of 900 dtex or more and 2500 dtex or less.

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