Laminate for tire

Abstract

Provided is a laminate for a tire, the laminate having both excellent communication properties of an embedded transponder and excellent durability of the laminate. A laminated body for a tire having a transponder, a cover rubber layer covering the transponder, and an adjacent rubber layer laminated adjacent to at least one surface of the cover rubber layer, the transponder having an IC substrate and antennas at both end portions of the IC substrate, the linear distance between the ends of the antennas provided at both end portions of the IC substrate being 30-60 mm, the linear distance between the ends of the antennas provided at both end portions of the IC substrate being 30-60 mm, and the linear distance between the ends of the antennas provided at both end portions of the IC substrate being 30-60 mm. The coating rubber layer contains a rubber component, carbon black, calcium carbonate, and oil, and contains 1-15 parts by mass of carbon black and 1-80 parts by mass of calcium carbonate per 100 parts by mass of the rubber component, and the oil extraction amount of the coating rubber layer and the oil extraction amount of the adjacent rubber layer satisfy a predetermined relationship. The above-mentioned problem can be solved by this laminate for tires.

Description

Technical Field

[0001] The present invention relates to a tire laminate in which a transponder is coated and buried, and a tire including the tire laminate. Background Art

[0002] Regarding tires, in order to perform identification and management during their manufacture, distribution, use, etc., a method of burying a transponder inside a tire laminate has been proposed. For example, Patent Document 1 discloses a pneumatic tire in which a pair of sidewall portions and a tread portion are connected in a ring shape between a pair of bead portions, and the inner liner rubber layer and the reinforcing rubber layer on the inner peripheral surface side of the tire constituting the bead portion are configured such that the ends thereof overlap and the end of the reinforcing rubber layer covers the end of the inner liner rubber layer, and a transponder is provided therebetween and buried in a direction in which its axis is along the circumferential direction of the tire.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Laid-Open No. 7-137510 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] Here, regarding the communication performance of the transponder buried inside the tire laminate, the resistance of the rubber layer covering the transponder (especially the blending amount of carbon black), etc. have a great influence. For example, the less the blending amount of carbon black in the rubber layer covering the transponder, the more the communication performance of the covered transponder is improved. On the other hand, the blending amount of carbon black in the rubber layer covering the transponder, etc. affects not only the rubber layer but also the durability of the entire laminate constituting the tire. For example, the more the blending amount of carbon black in the rubber layer covering the transponder, the more the durability of the laminate is improved. That is to say, the communication performance of the transponder and the durability of the laminate are roughly in an opposing relationship, and these are all problems in achieving an excellent tire laminate, etc.

[0008] Therefore, an object of the present invention is to provide a tire laminate in which the communication performance of the buried transponder and the durability of the laminate are both excellent.

[0009] Means for Solving the Problems

[0010] In order to solve the above problems, the present inventors conducted in-depth research and as a result, found a laminated body for a tire, which has a transponder, a covering rubber layer covering the transponder, and an adjacent rubber layer laminated adjacent to at least one surface of the covering rubber layer. The transponder has an IC substrate and antennas at both ends of the IC substrate, and the straight-line distance between the ends of the antennas provided at both ends of the IC substrate is 30 mm or more and 60 mm or less. The covering rubber layer contains a rubber component, carbon black, calcium carbonate, and oil, and contains 1 to 15 parts by mass of the carbon black and 1 to 80 parts by mass of the calcium carbonate with respect to 100 parts by mass of the rubber component. The oil extraction amount (O1) of the covering rubber layer and the oil extraction amount (O2) of the adjacent rubber layer satisfy a specified relationship. It was found that both the communication performance of the transponder of the above laminated body for a tire and the durability of the laminated body are excellent, and thus the present invention was completed.

[0011] That is, the present invention includes the following embodiments [1] to

[12] .

[0012] [1]. A laminated body for a tire, which has a transponder, a covering rubber layer covering the transponder, and an adjacent rubber layer laminated adjacent to at least one surface of the covering rubber layer. The transponder has an IC substrate and antennas provided at both ends of the IC substrate, and the straight-line distance between the ends of the antennas provided at both ends of the IC substrate is 30 mm or more and 60 mm or less. The covering rubber layer contains a rubber component, carbon black, calcium carbonate, and oil, and contains 1 to 15 parts by mass of the carbon black and 1 to 80 parts by mass of the calcium carbonate with respect to 100 parts by mass of the rubber component. The oil extraction amount (O1) of the covering rubber layer and the oil extraction amount (O2) of the adjacent rubber layer satisfy the relationship of the following formula (1),

[0013] 0.5 ≤ O1 / O2 ≤ 2.0 Formula (1).

[0014] [2]. The laminated body for a tire according to [1], wherein the calcium carbonate contained in the covering rubber layer is light calcium carbonate or calcium carbonate surface-treated with a fatty acid metal salt, and more preferably light calcium carbonate surface-treated with a fatty acid metal salt.

[0015] [3]. The laminated body for a tire according to [1] or [2], wherein the covering rubber layer contains 5 to 15 parts by mass of the carbon black with respect to 100 parts by mass of the rubber component.

[0016] [4]. The laminated body for a tire according to any one of [1] to [3], wherein the carbon black contained in the covering rubber layer has a nitrogen adsorption specific surface area (N2SA) of 20 to 50 m 2 / g and the carbon black with a DBP absorption amount of less than 100 mL / 100 g, more preferably the carbon black with a nitrogen adsorption specific surface area (N2SA) of 25 to 40 m 2 / g and the carbon black with a DBP absorption amount of less than 90 mL / 100 g.

[0017] [5]. The laminated body for a tire according to any one of [1] to [4], wherein the mass ratio (carbon black / calcium carbonate) of the carbon black in the coating rubber layer to the calcium carbonate is greater than 0.05, more preferably 0.10 or more and 5.0 or less, still more preferably 0.10 or more and 2.0 or less, yet more preferably 0.15 or more and 1.5 or less, and further more preferably 0.15 or more and less than 1.0.

[0018] [6]. The laminated body for a tire according to any one of [1] to [5], wherein the coating rubber layer contains 5 to 70 parts by mass, more preferably 10 to 60 parts by mass, and still more preferably 30 to 60 parts by mass of the calcium carbonate with respect to 100 parts by mass of the rubber component.

[0019] [7]. The laminated body for a tire according to any one of [1] to [6], wherein the oil extraction amount (O1) of the coating rubber layer and the oil extraction amount (O2) of the adjacent rubber layer satisfy the relational expression of 0.8 ≤ O1 / O2 ≤ 1.8, and further 1.0 ≤ O1 / O2 ≤ 1.6.

[0020] [8]. The laminated body for a tire according to any one of [1] to [7], wherein the rubber component in the coating rubber layer contains natural rubber (NR) and / or styrene-butadiene copolymer rubber (SBR)

[0021] [9]. The laminated body for a tire according to any one of [1] to [8], wherein the coating rubber layer contains 1 to 30 parts by mass, more preferably 5 to 20 parts by mass, and still more preferably 5 to 10 parts by mass of the oil with respect to 100 parts by mass of the rubber component.

[0022]

[10] . The laminated body for a tire according to any one of [1] to [9], wherein the adjacent rubber layer contains 1 to 30 parts by mass, more preferably 5 to 20 parts by mass, and still more preferably 5 to 15 parts by mass of the oil with respect to 100 parts by mass of the rubber component contained in the adjacent rubber layer.

[0023]

[11] . The laminated body for a tire according to any one of [1] to

[10] , wherein the layer thickness of the coating rubber layer in the region covering the transponder is 0.3 to 1.5 mm.

[0024]

[12] . A tire comprising the laminated body for a tire according to any one of [1] to

[11] .

[0025] Advantages of the Invention

[0026] According to the present invention, a laminated body for a tire can be obtained, which has excellent communication performance of the buried transponder and excellent durability of the laminated body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a partial cross-sectional schematic view (schematic diagram) showing an example of an embodiment of the laminated body for a tire of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The present invention will be described.

[0029] The present invention relates to a laminated body for a tire and a tire including the laminated body for a tire. The laminated body for a tire has a transponder, a covering rubber layer covering the transponder, and an adjacent rubber layer laminated adjacent to at least one surface of the covering rubber layer.

[0030] The transponder has an IC substrate and antennas provided at both end portions of the IC substrate, and the linear distance between the ends of the antennas provided at the both end portions of the IC substrate is 30 mm or more and 60 mm or less.

[0031] The covering rubber layer contains a rubber component, carbon black, calcium carbonate, and oil, and contains 1 to 15 parts by mass of the carbon black and 1 to 80 parts by mass of the calcium carbonate with respect to 100 parts by mass of the rubber component. The oil extraction amount of the covering rubber layer and the oil extraction amount of the adjacent rubber layer satisfy a specified relationship. Hereinafter, they will be referred to as "the laminated body for a tire of the present invention" and "the tire of the present invention".

[0032] In addition, in the present invention, the numerical range represented by "~" means a numerical range in which the numerical value described before "~" is used as the lower limit value and the numerical value described after "~" is used as the upper limit value, unless otherwise specified.

[0033] Hereinafter, the configuration, contained components, and their contents, etc. of the laminated body for a tire of the present invention will also be described in detail with reference to the drawings. In addition, for the sake of understanding the invention, the dimensional ratios (length, thickness, etc.) or orientations of the respective components shown in the drawings may sometimes be different from the actual dimensional ratios or orientations.

[0034] [Transponder]

[0035] The laminated body for a tire of the present invention is a laminated body for a tire including a rubber layer, and has a transponder. Moreover, the transponder is covered with a covering rubber layer described later and buried in the laminated body. Here, the "transponder" refers to a device or equipment for non-contact transmission and reception of data.

[0036] Moreover, the transponder included in the laminated body for a tire of the present invention has an IC substrate for storing data and an antenna for non-contact data transmission and reception at both ends of the IC substrate, and the straight-line distance between the ends of the antenna provided at both ends of the IC substrate is 30 mm or more and 60 mm or less. Here, "both ends of the IC substrate" refers to the two ends in the length direction of the IC substrate. By doing so (especially by making the straight-line distance between the ends of the above-described antenna covered with the specified covering rubber layer within the specified range), the transponder has high communication performance in a state of being embedded in the laminated body for a tire of the present invention. Therefore, by using this transponder, it is possible to accurately write or read information related to the tire, and it is possible to perform identification, management, etc. during the manufacture, distribution, use, etc. of the tire.

[0037] As the transponder, for example, an RFID (Radio Frequency Identification) tag can be used. In addition, RFID is composed of a reader / writer having an antenna and a controller and an ID tag having an IC substrate and an antenna, and is an automatic identification technology capable of transmitting data wirelessly.

[0038] There is no particular limitation on the overall shape of the transponder. For example, a columnar or plate-like shape can be used. In addition, it may be a structure in which at least one of the antennas is bent or curved. In particular, when using Figure 1 the columnar transponder 31 shown, it is possible to follow the deformation in each direction of the tire, and thus it is preferred. In the case of this embodiment, the antenna 35 of the transponder 31 is provided so as to protrude from both ends of the IC substrate 33 and is in a spiral shape. Thereby, it is possible to follow the deformation of the tire during traveling and improve the durability of the transponder.

[0039] Furthermore, by appropriately changing the straight-line distance between the ends of the above-described antenna within a specified range, the communication performance can be further improved. The same applies to the length of the antenna itself.

[0040] For example, the straight-line distance between the ends of the above-described antenna is more preferably 35 mm or more, further preferably 40 mm or more, still further preferably 45 mm or more, and even more preferably 50 mm or more. Here, the "straight-line distance between the ends of the antenna" refers to the distance (length) when the ends (the ends not connected to the IC substrate) of each antenna provided at both ends of the IC substrate are connected by a straight line. In Figure 1 the embodiment, it is the distance (the length of L) when the respective ends 35a of the antenna 35 are connected by a straight line.

[0041] 〔Covering rubber layer〕

[0042] The laminate for a tire of the present invention further includes a covering rubber layer that covers the above-mentioned transponder. Here, the so-called "covering the transponder" means surrounding and covering the whole of the transponder so that the transponder is not exposed (covering the whole by sandwiching the front and back surfaces of the transponder and laminating). For example, as Figure 1 illustrated in the embodiment where the transponder 31 is covered and laminated in such a manner as to be sandwiched between two covering rubber layers 21. Moreover, for the lamination and adhesion of the covering rubber layer, an adhesive may also be used. That is, an adhesive layer composed of an adhesive may also be disposed between the two covering rubber layers or the like. In addition, Figure 1 is a partial cross-sectional view (schematic diagram), which does not mean that the side surface of the transponder 31 is exposed. In this embodiment, the whole of the transponder 31 is also covered by the covering rubber layer 21. Therefore, by being covered by the covering rubber layer, the transponder becomes a state of being embedded in the laminate for a tire of the present invention.

[0043] The covering rubber layer further contains a rubber component, carbon black, calcium carbonate, and oil. Hereinafter, the details thereof will be described.

[0044] <Rubber component>

[0045] There is no particular limitation on the rubber component contained in the covering rubber layer, and any known rubber component used in applications such as tires can be used. From the viewpoints of the laminate for a tire and the like, the rubber component preferably contains a rubber component having a double bond in the polymer main chain, that is, a diene-based rubber, and more preferably consists of a diene-based rubber, but is not limited thereto. Examples of the diene-based rubber include natural rubber (NR), butadiene rubber (BR), styrene-butadiene copolymer rubber (styrene-butadiene rubber, SBR), acrylonitrile-butadiene copolymer rubber (nitrile rubber, NBR), chloroprene rubber (CR), synthetic isoprene rubber (IR), styrene-isoprene copolymer rubber, isoprene-butadiene copolymer rubber, styrene-butadiene-vinylpyridine terpolymer (VP), and the like. Particularly preferably, the rubber component contained in the covering rubber layer contains NR or SBR.

[0046] However, rubber components other than diene-based rubbers such as olefin-based rubbers (ethylene-propylene rubber, acrylic rubber, etc.), fluororubbers, and silicone rubbers may also be used or used in combination.

[0047] In addition, the weight-average molecular weight of the diene-based rubber is preferably 50,000 to 3,000,000, and more preferably 100,000 to 2,000,000. In addition, the above-mentioned diene-based rubbers may all be rubbers end-modified with amino groups, amide groups, silyl groups, alkoxysilyl groups, carboxyl groups, hydroxyl groups, etc. or epoxidized rubbers.

[0048] Herein, the "weight-average molecular weight" in the present invention refers to the value measured by gel permeation chromatography (GPC) using tetrahydrofuran as a solvent and converted with standard polystyrene. In addition, for this GPC measurement, a chromatographic column (manufactured by Polymer Laboratories, MIXED-B) is used as a detector, and the measurement is carried out at 40°C.

[0049] <Carbon black>

[0050] There is no particular limitation on the carbon black contained in the coated rubber layer, and any known carbon black used in applications such as tires can be used. For example, as specific examples of carbon black, carbon blacks of various grades such as SAF-HS, SAF, ISAF-HS, ISAF, ISAF-LS, IISAF-HS, HAF-HS, HAF, HAF-LS, FEF, GPF, SRF, FT, MT, etc. can be used. Moreover, this carbon black can be used alone as one kind, or two or more kinds can be used in combination. In addition, the nitrogen adsorption specific surface area (N2SA) of this carbon black is preferably 20 to 50 m 2 / g, more preferably 25 to 40 m 2 / g. In addition, the DBP absorption amount of this carbon black is also preferably less than 100 mL / 100 g, more preferably less than 90 mL / 100 g, from the viewpoint of more easily exerting the effects of the present invention. In particular, the carbon black contained in the coated rubber layer is more preferably a carbon black having a nitrogen adsorption specific surface area (N2SA) of 20 to 50 m 2 / g and a DBP absorption amount of less than 100 mL / 100 g.

[0051] In addition, this "carbon black" refers to carbon fine particles with a diameter of about 3 to 500 nm manufactured by industrial quality control, and its average particle size (the arithmetic average of the diameters of the particles photographed with an electron microscope) is preferably 25 to 250 μm, more preferably 35 to 100 μm. In addition, the nitrogen adsorption specific surface area (N2SA) of carbon black is the value measured according to JIS K6217-2:2017. In addition, the DBP absorption amount of carbon black is the value measured according to JIS K6217-4:2017.

[0052] Moreover, in the coated rubber layer, 1 to 15 parts by mass of carbon black is contained relative to 100 parts by mass of the rubber component contained in the coated rubber layer. Furthermore, the amount of this carbon black is more preferably 5 parts by mass or more relative to 100 parts by mass of the above rubber component, and can exceed 5 parts by mass. In addition, when the amount of this carbon black is less than 1 part by mass relative to 100 parts by mass of the above rubber component, the durability of the laminated body for tires of the present invention deteriorates, so it is not suitable. In addition, when the amount of this carbon black exceeds 15 parts by mass relative to 100 parts by mass of the above rubber component, the communication performance of the transponder cannot be improved, so it is not suitable.

[0053] <Calcium carbonate>

[0054] There is no particular limitation on the calcium carbonate contained in the rubber-coated layer, and any known calcium carbonate used in applications such as tires can be used. For example, as specific examples of calcium carbonate, light calcium carbonate, heavy calcium carbonate, precipitated calcium carbonate, surface-treated calcium carbonate, etc. can be cited. Moreover, this calcium carbonate can be used alone as one kind, or two or more kinds can be used in combination. In addition, from the viewpoint that the effects of the present invention are more easily exerted, this calcium carbonate is more preferably light calcium carbonate or surface-treated calcium carbonate. In particular, since the dispersibility in the rubber component and the like are further improved and the effects of the present invention are more easily exerted, calcium carbonate surface-treated with a fatty acid metal salt (especially light calcium carbonate surface-treated with a fatty acid metal salt) is more preferred.

[0055] In addition, the so-called "surface-treated calcium carbonate" means that the surface (particle surface) of calcium carbonate is treated with other components and reacts with or adsorbs other components on this surface. Therefore, the so-called "calcium carbonate surface-treated with a fatty acid metal salt" means calcium carbonate that reacts with or adsorbs a fatty acid metal salt on its surface by being treated with a fatty acid metal salt on the surface (particle surface).

[0056] Examples of fatty acid metal salts include saturated fatty acid salts such as potassium laurate, potassium myristate, potassium palmitate, sodium palmitate, barium stearate, calcium stearate, zinc stearate, potassium stearate, cobalt(II) stearate, tin(IV) stearate, sodium stearate, lead(II) stearate, etc., and unsaturated fatty acid salts such as zinc oleate, potassium oleate, cobalt(II) oleate, sodium oleate, potassium oleate diethanolamine salt, etc. One kind of them can be used alone for surface treatment, or two or more kinds can be used in combination. Among them, from the aspects of reactivity with calcium carbonate particles, particle stability, dispersibility, easy availability, cost, etc., metal salts (soaps) of mixed acids mainly composed of stearic acid and palmitic acid are preferred.

[0057] Further, in the rubber coating layer, together with the above carbon black, 1 to 80 parts by mass of the calcium carbonate is contained relative to 100 parts by mass of the rubber component contained in the rubber coating layer. Further, the amount of the calcium carbonate is more preferably 5 parts by mass or more, further preferably 10 parts by mass or more, still further preferably 30 parts by mass or more, and even more preferably more than 55 parts by mass relative to 100 parts by mass of the above rubber component. The upper limit may be 70 parts by mass or less, or may be 60 parts by mass or less. Thus, through the synergistic effect with the carbon black in the above-specified amount, the communication performance of the buried transponder and the durability of the laminate can be improved. When the amount of the calcium carbonate is less than 1 part by mass relative to 100 parts by mass of the above rubber component, the durability of the tire laminate of the present invention deteriorates, and thus it is not suitable. In addition, when the amount of the calcium carbonate exceeds 80 parts by mass relative to 100 parts by mass of the above rubber component, the communication performance of the transponder cannot be improved, and thus it is not suitable.

[0058] Further, in the rubber coating layer, since the synergistic effect between calcium carbonate and carbon black is more likely to be improved, it is more preferable that the mass ratio of carbon black to calcium carbonate (carbon black / calcium carbonate) in the rubber coating layer is greater than 0.05. Moreover, the mass ratio is more preferably 0.10 or more, and further preferably 0.15 or more. The upper limit is more preferably 5.0 or less, further preferably 2.0 or less, still further preferably 1.5 or less, even more preferably 1.0 or less, and even more preferably less than 1.0.

[0059] <Oil>

[0060] There is no particular limitation on the oil contained in the rubber coating layer, and any known oil (processing oil, vegetable oil, etc.) used in applications such as tires can be used. For example, as specific examples of the oil, oils derived from petroleum, oils derived from natural products (such as oils derived from wood), etc. can be cited. In addition, as an oil derived from petroleum, TDAE (Treated Distillate Aromatic Extract) oil (product of Shell Lubricants Japan Co., Ltd.) etc. can be exemplified, and as an oil derived from wood, tall oil derived from pine wood (oil obtained when manufacturing kraft pulp, product of Harima Kasei Group Co., Ltd.) etc. can be exemplified, but it is not limited to these. Moreover, the oil can be used alone as one kind, or two or more kinds can be used in combination.

[0061] Moreover, in the rubber coating layer, 1 to 30 parts by mass of the oil is preferably contained relative to 100 parts by mass of the rubber component contained in the rubber coating layer. Further, the amount of the oil is more preferably 5 parts by mass or more relative to 100 parts by mass of the above rubber component. The upper limit is more preferably 20 parts by mass or less, and further preferably 10 parts by mass or less.

[0062] In addition, the rubber-coated layer preferably contains a vulcanizing agent (such as sulfur, etc.). Moreover, the rubber-coated layer is preferably a vulcanized rubber-coated layer. In addition, within a range that does not significantly affect the effects of the present invention, the rubber-coated layer may also contain, as optional components, appropriate amounts of various additives commonly used in rubber compositions such as resin components (terpene resin, coumarone resin, indene resin, rosin resin, etc.), zinc oxide (zinc white), stearic acid, wax, lecithin, anti-aging agent, plasticizer, vulcanization accelerator, vulcanization acceleration aid, etc.

[0063] For example, the contents of stearic acid, zinc oxide, and resin component in the rubber-coated layer are each preferably 1 to 5 parts by mass relative to 100 parts by mass of the rubber component contained in the rubber-coated layer. Moreover, the content of sulfur in the rubber-coated layer is preferably 2 to 6 parts by mass relative to 100 parts by mass of the rubber component contained in the rubber-coated layer. Further, the content of the vulcanization accelerator in the rubber-coated layer is the individual amount in the case of a primary accelerator and the blended amount in the case of a secondary accelerator, and is preferably 0.3 to 3.0 parts by mass, more preferably 0.5 to 2.0 parts by mass, relative to 100 parts by mass of the rubber component contained in the rubber-coated layer.

[0064] In addition, the layer thickness of the rubber-coated layer in the region covering the transponder is not limited, but since the effects of the present invention are easily exhibited, it is preferably 0.3 to 1.5 mm. Here, the "layer thickness of the rubber-coated layer in the region covering the transponder" refers to the layer thickness of each layer of the rubber-coated layer in the region covering the transponder in the rubber-coated layer included in the laminated body for a tire of the present invention. As Figure 1 In the embodiment shown, in the case of a structure in which the transponder 31 is covered with two rubber-coated layers 21 sandwiching the transponder 31, it does not refer to the total layer thickness of these two layers, but refers to the layer thickness of each layer of each rubber-coated layer 21 in the region covering the transponder 31 (the layer thickness on a straight line connecting any outer surface of the transponder 31 and orthogonal to the outer surface: T1, T2).

[0065] 〔Adjacent rubber layer〕

[0066] The laminated body for a tire of the present invention further includes an adjacent rubber layer laminated adjacent to at least one surface of the above-described rubber-coated layer. Examples may include, Figure 1 an embodiment of a laminated body of 5 layers or more in which adjacent rubber layers 11 are laminated adjacent to both surfaces of the rubber-coated layer 21 covering the transponder 31 as shown, and an embodiment of a laminated body of 4 layers or more in which an adjacent rubber layer 11 is laminated adjacent to one surface (single surface) of the rubber-coated layer 21 covering the transponder 31 (for example, Figure 1 a structure in which either one of the adjacent rubber layers 11 is not laminated) etc. In addition, the layer thickness of the adjacent rubber layer is not particularly limited.

[0067] Herein, the "adjacent lamination" means lamination without disposing other layers between the covering rubber layer, and the other layers include layers other than the rubber layer such as an adhesive layer. Further, "adjacent to at least one surface of the covering rubber layer" means adjacent to at least one of the front and back surfaces of the covering rubber layer that covers the whole in a manner of sandwiching the front and back surfaces of the transponder.

[0068] Moreover, the adjacent rubber layer only needs to contain a rubber component, and there is no particular limitation on other compounding components, but it may also contain the same components as the above-mentioned covering rubber layer. Further, it may be a structure containing organic fibers (such as organic fiber cords such as polyester and nylon) or metals (such as steel cords). The same components as the above-mentioned covering rubber layer may also be used as the rubber component. Moreover, the adjacent rubber layer is also preferably a vulcanized adjacent rubber layer. Further, in the laminated body for a tire of the present invention, as long as the carbon black content of the covering rubber layer is within the above range, there is no limitation on the carbon black content of the adjacent rubber layer. Further, the adjacent rubber layer may also contain inorganic fillers other than carbon black. Examples of the inorganic filler include the above-mentioned calcium carbonate, silica, magnesium carbonate, clay, mica, talc, alumina, aluminum hydroxide, titanium oxide, calcium sulfate, barium sulfate, etc.

[0069] For example, the content of carbon black in the adjacent rubber layer is preferably 20 to 100 parts by mass with respect to 100 parts by mass of the rubber component contained in the adjacent rubber layer. Further, the contents of stearic acid, zinc oxide, and resin component in the adjacent rubber layer are each preferably 1 to 5 parts by mass with respect to 100 parts by mass of the rubber component contained in the adjacent rubber layer. Further, the content of sulfur in the adjacent rubber layer is preferably 2 to 6 parts by mass with respect to 100 parts by mass of the rubber component contained in the adjacent rubber layer. Further, regarding the content of the vulcanization accelerator in the adjacent rubber layer, it is a single amount in the case of a primary accelerator and a blended amount in the case of a secondary accelerator, and is preferably 0.3 to 3.0 parts by mass, more preferably 0.5 to 2.0 parts by mass, with respect to 100 parts by mass of the rubber component contained in the adjacent rubber layer.

[0070] Further, from the viewpoint of easily improving the durability of the laminated body for a tire of the present invention, the adjacent rubber layer preferably contains oil. The same oil as the above-mentioned covering rubber layer may also be used. Moreover, in the adjacent rubber layer, 1 to 30 parts by mass of the oil is preferably contained with respect to 100 parts by mass of the rubber component contained in the adjacent rubber layer. Further, the amount of the oil is more preferably 5 parts by mass or more with respect to 100 parts by mass of the above rubber component. The upper limit is more preferably 20 parts by mass or less, and further preferably 15 parts by mass or less.

[0071] [Ratio of oil extraction amount]

[0072] The laminate for a tire of the present invention is also configured such that the oil extraction amount (O1) of the covering rubber layer and the oil extraction amount (O2) of the adjacent rubber layer satisfy the relationship of the following formula (1). Thus, during manufacturing (e.g., during vulcanization pressing) and after manufacturing, etc., it is difficult for oil to migrate between the covering rubber layer and the adjacent rubber layer, and the durability of the laminate can be highly maintained.

[0073] 0.5 ≤ O1 / O2 ≤ 2.0 Formula (1)

[0074] In addition, since the effects of the present invention are more easily exerted, the lower limit of the formula (1) is more preferably 0.8 or more, and further preferably 1.0 or more. The upper limit is more preferably 1.8 or less, and further preferably 1.6 or less. For example, the above formula (1) can be 0.8 ≤ O1 / O2 ≤ 1.8, or can be 1.0 ≤ O1 / O2 ≤ 1.6.

[0075] Here, the oil extraction amount of the covering rubber layer and the oil extraction amount of the adjacent rubber layer are both values measured by the Soxhlet extraction method using acetone as the extraction solvent. In addition, even for a composition in which the adjacent rubber layer does not contain blended oil, although it is rare, the oil extraction amount (O2) is also measured by the above method. Therefore, the adjacent rubber layer can also be a structure without blended oil.

[0076] Moreover, by using the laminate for a tire of the present invention like this, a tire of the present invention in which a prescribed transponder is buried can be obtained. For example, between a carcass layer (a layer including cords forming the tire skeleton) and a liner layer (a layer equivalent to an inner tube), both having a prescribed oil extraction amount, a transponder covered with a prescribed covering rubber layer is buried along the tire circumferential direction to produce an unvulcanized tire including the laminate having the above structure, and by vulcanizing it (such as vulcanization pressing), a tire of the present invention including the laminate for a tire of the present invention can be manufactured. However, the burial position of the transponder is not limited to this, and it can be arbitrarily arranged as long as the function as a tire is not reduced. In addition, it can also be arranged such that one side of the covering rubber layer is exposed.

[0077] In addition, the tire of the present invention is preferably a pneumatic tire. As the gas filled in the pneumatic tire, for example, non-reactive gases such as air, nitrogen, argon, helium, and other gases can be used.

[0078] The laminate for a tire of the present invention and the tire of the present invention having the above structure are both excellent in the communication performance of the buried transponder and the durability of the laminate (i.e., the durability of the tire).

[0079] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments, and the present invention can be variously modified within the technical idea of the present invention.

[0080] Examples

[0081] (Manufacture and Evaluation of Tires)

[0082] A tire containing a laminate was manufactured. The laminate is as shown in Figure 1 and uses a transponder (RFID tag), a coating rubber layer composed of the components shown in the upper part of Table 2 below or the upper part of Table 3 below, and an adjacent rubber layer composed of the components shown in Table 1 below. The transponder has an IC substrate and antennas at both ends of the IC substrate, and the straight-line distance between the ends of the antennas is about 55 mm.

[0083] Specifically, first, a mixed rubber is formed using the components (except sulfur and vulcanization accelerators) in the mass parts shown in the upper part of Table 2 below and the upper part of Table 3 below. Then, sulfur and vulcanization accelerators shown in the upper part of Table 2 below or the upper part of Table 3 below are mixed therein, and formed into a specified sheet shape to produce an unvulcanized rubber sheet (coating rubber layer). Then, any one of these is used to coat the above-mentioned transponder as shown in Figure 1 shown. Furthermore, a mixed rubber is formed using the components (except sulfur and vulcanization accelerators) in the mass parts shown in Table 1 below. Then, sulfur and vulcanization accelerators shown in Table 1 below are mixed therein, and formed into a specified sheet shape to produce an unvulcanized rubber sheet (adjacent rubber layer). Then, they are laminated to form a laminate in the combination shown in Tables 2 and 3 below, and an unvulcanized tire is formed in such a manner that the transponder is disposed between the carcass ply and the inner liner, and vulcanized under the conditions of a vulcanization temperature of 185 °C, a vulcanization time of 15 minutes, and a pressure of 2.3 MPa, thereby manufacturing the tires (pneumatic radial tires) of Examples 1 to 12 and Comparative Examples 1 to 23.

[0084] In addition, the oil extraction amount (O2) of the above-mentioned adjacent rubber layer and the oil extraction amount (O1) of the coating rubber layer are both measured by the Soxhlet extraction method using acetone as the extraction solvent.

[0085] Then, for the tires of Examples 1 to 12 and Comparative Examples 1 to 23 obtained, the communication performance of the transponder and the durability of the tires are evaluated as follows.

[0086] <Communication Performance>

[0087] For each tire, communication operations with the transponder are performed using a reader / writer. Specifically, the longest communicable distance is measured when the output in the reader / writer is set to 250 mW and the carrier frequency is set to 860 MHz to 960 MHz. The evaluation results are expressed as an index when Comparative Example 1 is taken as the index 100. The larger this index value, the better the communication performance.

[0088] <Durability>

[0089] Each tire was assembled on a wheel with a standard rim, mounted on a test vehicle, and a running test of climbing a curb with a height of 100 mm was carried out under the conditions of an air pressure of 230 kPa and a running speed of 20 km / h. After the running, damage to the outer surface of the tire corresponding to the position where the transponder was installed was confirmed. This test was carried out multiple times, and regarding the evaluation results, the number of times of damage was expressed as an index when the comparative example 1 was taken as an index of 100. The larger this index value is, the better the durability is.

[0090] Table 1

[0091]

[0092]

[0093]

[0094] The details of each component, etc. in Tables 1 to 3 above are as follows.

[0095] · NR: Natural rubber (STR20, manufactured by Bonbandy Co., Ltd.)

[0096] · SBR: Styrene-butadiene copolymer rubber (Nipol 1502, manufactured by Zeon Corporation, Japan)

[0097] · Carbon black: Nitron #55S (GPF, nitrogen adsorption specific surface area (N2SA): 26 m 2 / g, DBP absorption amount: 88 mL / 100 g, average particle size: 56 μm, manufactured by Nippon Carbon Co., Ltd.)

[0098] · Oil: Extract No. 4S (TDAE oil, manufactured by Shell Lubricants Japan Co., Ltd.)

[0099] · Zinc oxide: Zinc oxide (ZnO, manufactured by Sho Do Chemical Co., Ltd.)

[0100] · Stearic acid: Stearic acid YR (manufactured by NOF Corporation)

[0101] · Terpene resin: Tackifier (manufactured by Yasuhara Chemical Co., Ltd.)

[0102] · Sulfur: Micron OT-20 (manufactured by Shikoku Kasei Kogyo Co., Ltd.)

[0103] · Vulcanization accelerator: Nocceler NS-P (manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.)

[0104] · Calcium carbonate 1: Light calcium carbonate (without surface treatment, manufactured by Maruo Calcium Co., Ltd.)

[0105] · Calcium carbonate 2: MSK-V (surface-treated product of light calcium carbonate treated with fatty acid metal salt, manufactured by Maruo Calcium Co., Ltd.)

[0106] · Oil extraction amount (O2): Oil extraction amount (O2) of the adjacent rubber layer

[0107] · O1 / O2: Oil extraction amount (O1) of the coated rubber layer / Oil extraction amount (O2) of the adjacent rubber layer

[0108] From these results, it can be seen that by manufacturing a tire containing the following laminate, a tire embedded with a transponder is obtained, which has excellent communication performance of the transponder and durability of the tire (durability of the tire laminate). The coated rubber layer covering a specified transponder in the laminate contains a specified amount of carbon black, a specified amount of calcium carbonate, and oil, and furthermore, the ratio of the oil extraction amount of the coated rubber layer to the oil extraction amount of the adjacent rubber layer adjacent thereto is within a specified range

[0109] In addition, the durability of the tires of Comparative Examples 1 to 11 in which the coated rubber layer does not contain calcium carbonate was not improved. Also, the durability of the tires of Comparative Examples 1 to 3, 5 to 6, 8 to 9, 11 to 20, and 22 to 23 in which O1 / O2 is not within the specified range was not improved in the same way. Moreover, in Comparative Examples 1 and 11 in which the carbon black content of the coated rubber layer is more than the specified amount, and in Comparative Examples 21 to 23 in which the calcium carbonate content of the coated rubber layer is more than the specified amount, the communication performance of the transponder was not improved

[0110] This application claims priority based on Japanese Patent Application No. 2023-053358 filed on March 29, 2023, and incorporates its entire disclosure herein

[0111] Explanation of reference numerals

[0112] 100 Laminate for tire (partial cross-section of tire)

[0113] 11 Adjacent rubber layer

[0114] 21 Coated rubber layer

[0115] 31 Transponder

[0116] 33 IC substrate

[0117] 35 Antenna

[0118] 35a Antenna end

[0119] L Straight-line distance between antenna ends

[0120] T1, T2 Thickness of coated rubber layer

Claims

1. A laminate for a tire, comprising a transponder, a covering rubber layer covering the transponder, and an adjacent rubber layer laminated adjacent to at least one surface of the covering rubber layer. The transponder has an IC substrate and antennas provided at both end portions of the IC substrate, and the linear distance between the ends of the antennas provided at the both end portions of the IC substrate is 30 mm or more and 60 mm or less. The covering rubber layer contains a rubber component, carbon black, calcium carbonate, and oil, and contains 1 to 15 parts by mass of the carbon black and 1 to 80 parts by mass of the calcium carbonate with respect to 100 parts by mass of the rubber component. The oil extraction amount O1 of the covering rubber layer and the oil extraction amount O2 of the adjacent rubber layer satisfy the relationship of the following formula (1). 0.5 ≤ O1 / O2 ≤ 2.0 Formula (1).

2. The laminate for a tire according to claim 1, wherein the calcium carbonate contained in the covering rubber layer is calcium carbonate surface-treated with a fatty acid metal salt.

3. The laminate for a tire according to claim 1 or 2, wherein the covering rubber layer contains 5 to 15 parts by mass of the carbon black with respect to 100 parts by mass of the rubber component.

4. The laminated body for a tire according to claim 1 or 2, wherein the carbon black contained in the coating rubber layer is a carbon black having a nitrogen adsorption specific surface area N2SA of 20 to 50 m 2 / g and a DBP absorption amount of less than 100 mL / 100 g.

5. The laminate for a tire according to claim 1 or 2, wherein the mass ratio of the carbon black in the covering rubber layer to the calcium carbonate, that is, carbon black / calcium carbonate, is greater than 0.

05.

6. A tire, comprising the laminate for a tire according to claim 1 or 2.

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