WO2023079913A1 - Ｒｆｉｄタグ用コーティングゴム組成物及びタイヤ - Google Patents

Ｒｆｉｄタグ用コーティングゴム組成物及びタイヤ Download PDF

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Publication number
WO2023079913A1
WO2023079913A1 PCT/JP2022/037918 JP2022037918W WO2023079913A1 WO 2023079913 A1 WO2023079913 A1 WO 2023079913A1 JP 2022037918 W JP2022037918 W JP 2022037918W WO 2023079913 A1 WO2023079913 A1 WO 2023079913A1
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WIPO (PCT)
Prior art keywords
rubber composition
rubber
mass
tire
rfid tag
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/037918
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English (en)
French (fr)
Japanese (ja)
Inventor
良彦 鈴木
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Bridgestone Corp
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Bridgestone Corp
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Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to CN202280072935.3A priority Critical patent/CN118201783A/zh
Priority to JP2023557916A priority patent/JPWO2023079913A1/ja
Priority to EP22889736.9A priority patent/EP4427948A4/en
Priority to US18/694,413 priority patent/US20240392107A1/en
Publication of WO2023079913A1 publication Critical patent/WO2023079913A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic

Definitions

  • the present invention relates to a coating rubber composition for RFID tags and a tire.
  • Patent Document 1 The RFID tag is usually covered with a coating rubber in order to be placed in a tire consisting mainly of rubber material.
  • the coating rubber for the RFID tag has various required properties such as crack resistance, adhesiveness with adjacent rubber members, and appropriate elastic modulus.
  • the present inventor examined conventional coating rubbers for RFID tags, and found that the conventional coating rubbers for RFID tags had poor communication performance, crack resistance, adhesion to adjacent rubber members, and elastic modulus. found to be difficult to balance sufficiently.
  • the present invention solves the above-mentioned problems of the prior art, and provides a coating rubber composition for RFID tags that can sufficiently balance communication performance, crack resistance, adhesiveness with adjacent rubber members, and elastic modulus.
  • the task is to Another object of the present invention is to provide a tire having an RFID tag and having excellent communication performance and durability.
  • the main structure of the coating rubber composition for RFID tags and the tire of the present invention that solves the above problems is as follows.
  • a tire comprising an RFID tag coated with the RFID tag coating rubber composition according to any one of [1] to [4].
  • the coating rubber composition for RFID tags which can fully balance communication performance, crack resistance, adhesiveness with an adjacent rubber member, and an elastic modulus can be provided. Moreover, according to the present invention, it is possible to provide a tire that is excellent in communication performance and durability.
  • FIG. 1 is a cross-sectional view of one embodiment of the tire of the present invention.
  • the RFID tag coating rubber composition and tire of the present invention will be illustrated and explained in detail below based on the embodiments thereof.
  • the RFID tag coating rubber composition of the present invention contains a rubber component and silica.
  • the RFID tag coating rubber composition of the present invention is characterized in that the silica content is 60 parts by mass or more with respect to 100 parts by mass of the rubber component.
  • Common rubber compositions contain carbon black, but carbon black increases the dielectric constant of the rubber composition, shortens the communication distance (communicable distance) of the RFID tag, and degrades the communication performance.
  • carbon black increases the dielectric constant of the rubber composition, shortens the communication distance (communicable distance) of the RFID tag, and degrades the communication performance.
  • the crack resistance and elastic modulus of the rubber composition will decrease.
  • the RFID tag coating rubber composition of the present invention contains silica, and unlike carbon black, the silica does not increase the relative dielectric constant of the rubber composition, so the RFID tag can increase the communication distance. communication performance can be improved.
  • the content of silica is 60 parts by mass or more with respect to 100 parts by mass of the rubber component, it is possible to sufficiently secure the crack resistance and elastic modulus of the rubber composition.
  • the rubber composition has a sufficient elastic modulus, stress concentration on the RFID tag covered with the rubber composition is suppressed, and adhesion between the rubber composition (coating) and the adjacent rubber member is ensured. can. Therefore, the RFID tag coating rubber composition of the present invention can sufficiently balance communication performance, crack resistance, adhesiveness with adjacent rubber members, and elastic modulus.
  • the RFID tag coating rubber composition of the present invention contains a rubber component, which provides rubber elasticity to the composition.
  • the rubber component is preferably a diene rubber, and may be natural rubber (NR), synthetic diene rubber, or both.
  • Examples of the synthetic diene rubber include isoprene rubber (IR), styrene-butadiene rubber (SBR), butadiene rubber (BR), styrene-isoprene rubber (SIR), chloroprene rubber (CR), and the like.
  • the rubber component may be used alone or in a blend of two or more.
  • the RFID tag coating rubber composition of the present invention contains silica, and the silica content is 60 parts by mass or more based on 100 parts by mass of the rubber component. By blending silica into the rubber composition, it is possible to improve the crack resistance and elastic modulus of the rubber composition without increasing the dielectric constant of the rubber composition. If the content is less than 60 parts by mass with respect to 100 parts by mass of the components, the crack resistance and elastic modulus of the rubber composition are insufficient. From the viewpoint of the communication distance (communicable distance) of the RFID tag, the relative dielectric constant of the rubber composition is preferably 4.0 or less, more preferably 2.5 or less.
  • silica examples include wet silica (hydrous silicic acid), dry silica (anhydrous silicic acid), calcium silicate, aluminum silicate, etc. Among these, wet silica is preferable. These silicas may be used singly or in combination of two or more.
  • the silica content is preferably 60 to 100 parts by mass, more preferably 60 to 80 parts by mass, based on 100 parts by mass of the rubber component.
  • the silica content is preferably 60 to 100 parts by mass, more preferably 60 to 80 parts by mass, based on 100 parts by mass of the rubber component.
  • the crack resistance and elastic modulus of the rubber composition can be further improved.
  • the content of silica is less than 60 parts by mass with respect to 100 parts by mass of the rubber component, crack resistance and elastic modulus are lowered.
  • the silica content is 60 to 100 parts by mass with respect to 100 parts by mass of the rubber component, the crack resistance and elastic modulus of the rubber composition can be further improved.
  • the content of silica is 60 to 80 parts by mass with respect to 100 parts by mass of the rubber component, the crack resistance and elastic modulus of the rubber composition can be further improved.
  • the RFID tag coating rubber composition of the present invention preferably further contains a silane coupling agent.
  • a silane coupling agent When the rubber composition contains a silane coupling agent, the interaction between the rubber component and silica increases, and the dispersibility of silica in the rubber component improves. In addition, by improving the dispersibility of silica in the rubber component, the action of silica can be fully exhibited, and the crack resistance and elastic modulus of the rubber composition can be further improved.
  • silane coupling agent examples include bis(3-triethoxysilylpropyl)tetrasulfide, bis(3-triethoxysilylpropyl)trisulfide, bis(3-triethoxysilylpropyl)disulfide, and bis(2-triethoxysilyl).
  • ethyl)tetrasulfide bis(3-trimethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 2-mercaptoethyltri Methoxysilane, 2-mercaptoethyltriethoxysilane, 3-trimethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-triethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 2-triethoxysilyl ethyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-trimethoxysilylpropyl benzothiazolyl tetrasulf
  • the content of the silane coupling agent is preferably 5 to 20% by mass of the silica content (that is, 5 to 20 parts by mass with respect to 100 parts by mass of silica).
  • the content of the silane coupling agent is 5% by mass or more of the content of the silica, the compounding effect of the silane coupling agent is increased, and the dispersibility of silica in the rubber component is further improved, thereby improving the rubber composition. It is possible to further improve the crack resistance and elastic modulus of the product.
  • the content of the silane coupling agent is 20% by mass or less of the content of the silica, gelation of the rubber component can be suppressed.
  • the content of the silane coupling agent is 5 to 20% by mass of the silica content, the crack resistance and elastic modulus of the rubber composition can be further improved.
  • the RFID tag coating rubber composition of the present invention preferably contains a vulcanizing agent, a vulcanization accelerator, oil, and a tackifier in addition to the rubber component, silica, and silane coupling agent described above.
  • the coating rubber composition for RFID tags of the present invention may optionally contain various components commonly used in the rubber industry, such as fillers other than silica, antioxidants, waxes, and softeners other than oil. Agents, processing aids, stearic acid, zinc oxide (zinc white) and the like may be appropriately selected and contained within a range that does not impair the object of the present invention. Commercially available products can be suitably used as these compounding agents.
  • Vulcanizing agents include sulfur.
  • the sulfur preferably contains insoluble sulfur.
  • Insoluble sulfur is sulfur that is insoluble in carbon disulfide (amorphous polymeric sulfur), has lower solubility in rubber components than soluble sulfur, and is less likely to bloom.
  • the ratio of insoluble sulfur in sulfur is preferably 50 to 90% by mass from the viewpoint of further improving workability during tire molding.
  • the content of the vulcanizing agent is preferably 6.0 parts by mass or more with respect to 100 parts by mass of the rubber component.
  • vulcanization accelerators include guanidine-based vulcanization accelerators, sulfenamide-based vulcanization accelerators, thiazole-based vulcanization accelerators, thiuram-based vulcanization accelerators, and dithiocarbamate-based vulcanization accelerators.
  • guanidine-based vulcanization accelerators are preferred.
  • guanidine-based vulcanization accelerators 1,3-diphenylguanidine (DPG) is particularly preferred.
  • DPG 1,3-diphenylguanidine
  • the content of the vulcanization accelerator is 0.0 to 1.0% per 100 parts by mass of the rubber component. It is preferably 0 parts by mass.
  • the oil is a general term for extender oil contained in the rubber component and liquid oil added as a compounding agent of the rubber composition, and petroleum softeners such as aromatic oil, paraffin oil, and naphthenic oil; Vegetable softeners such as palm oil, castor oil, cottonseed oil and soybean oil can be mentioned. Among these, petroleum-based softeners such as aromatic oils, paraffinic oils, and naphthenic oils are preferred.
  • a naphthenic oil containing asphalt is preferable.
  • the rubber composition contains an asphalt-containing naphthenic oil, the rubber composition is more cohesive during kneading, and workability during kneading of the rubber composition is further improved.
  • the naphthenic oil containing asphalt a mixture of naphthenic base oil and asphalt in a mass ratio range of (95/5) to (30/70) is preferable. If the mass ratio is within this range, the compatibility between the rubber component and the oil is further improved.
  • a hydrogenated naphthenic base oil is preferable, and a hydrogenated naphthenic base oil obtained by highly hydrorefining an aromatic oil or naphthenic oil using a high-pressure/high-temperature hydrorefining production apparatus is particularly preferred.
  • Such hydrogenated naphthenic base oils are specifically available as commercial products such as SNH8, SNH46, SNH220 and SNH440 (all trademarks) manufactured by Sankyo Yuka Kogyo Co., Ltd.
  • the asphalt mixed with the naphthenic base oil the asphaltene component is 5% by mass or less in consideration of the compatibility with the rubber component used and the effect of improving the coherence in kneading of the rubber composition. is preferred.
  • the asphaltene component is quantified by composition analysis measured in accordance with the JPI method [Japan Petroleum Institute standard JPI-5S-22-83 (established in 1983) standard name "composition analysis method by column chromatography of asphalt”].
  • Such asphalt is preferably straight asphalt, and more preferably naphthenic straight asphalt. Further, the asphalt preferably has a kinematic viscosity of 300 mm 2 /sec or less at 120°C.
  • the method of mixing the asphalt is not particularly limited, but from the viewpoint of ease of preparation and economy, a method of dissolving asphalt in naphthenic base oil (including extender oil and blended oil) is preferable. .
  • a hydrogenated naphthenic base oil produced by a high-pressure/high-temperature hydrorefining unit and a naphthenic straight asphalt containing 5% by mass or less of asphaltene are mixed at a mass ratio (63/37).
  • the product name "A/O Mix” manufactured by Sankyo Yuka Kogyo Co., Ltd. obtained by the above method is preferable.
  • the content of the oil is more than 0 parts by mass and 15 parts by mass with respect to 100 parts by mass of the rubber component, from the viewpoint of further improving the coherence in kneading of the rubber composition and further improving workability during kneading. The following are preferable.
  • the rubber composition contains a tackifier
  • the adhesiveness of the rubber composition is improved, and the workability of the rubber composition when molding a tire is improved.
  • various natural resins and synthetic resins can be used. Specifically, rosin-based resins, terpene-based resins, petroleum-based resins, phenol-based resins, coal-based resins, and xylene-based resins can be used. It is preferred to use These tackifiers may be used singly or in combination of two or more.
  • the rubber composition contains at least one selected from the group consisting of rosin-based resins, terpene-based resins, petroleum-based resins, phenol-based resins, coal-based resins, and xylene-based resins
  • the adhesiveness of the rubber composition is further improved. This further improves the workability of the rubber composition during tire molding.
  • rosin-based resins include gum rosin, tall oil rosin, wood rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin, glycerin of modified rosin, pentaerythritol ester, and the like.
  • examples of terpene resins include ⁇ -pinene, ⁇ -pinene, and dipentene terpene resins, aromatic modified terpene resins, terpene phenol resins, and hydrogenated terpene resins.
  • polymerized rosins, terpene phenolic resins, and hydrogenated terpene resins are preferred from the standpoint of the fracture resistance of the rubber composition blended therein.
  • the petroleum-based resin is, for example, a cracked oil fraction containing unsaturated hydrocarbons such as olefins and diolefins, which are by-produced together with petrochemical basic raw materials such as ethylene and propylene by thermal decomposition of naphtha in the petrochemical industry. obtained by polymerizing the mixture as it is with a Friedel-Crafts type catalyst.
  • Examples of the petroleum-based resins include aliphatic petroleum resins obtained by (co)polymerizing C5 fractions obtained by thermal decomposition of naphtha (hereinafter sometimes referred to as " C5 -based resins”), naphtha Aromatic petroleum resin obtained by (co)polymerizing the C9 fraction obtained by thermal decomposition of (hereinafter sometimes referred to as " C9 resin”), the C5 fraction and the C9 fraction Copolymerized petroleum resins obtained by copolymerizing fractions (hereinafter sometimes referred to as "C 5 -C 9 resins”), alicyclic compound petroleum resins such as hydrogenated and dicyclopentadiene , styrene, substituted styrene, or copolymers of styrene and other monomers.
  • C5 -based resins naphtha Aromatic petroleum resin obtained by (co)polymerizing the C9 fraction obtained by thermal decomposition of (hereinafter sometimes referred to as " C9 resin")
  • the C5 fraction obtained by pyrolysis of naphtha usually contains olefinic Hydrocarbons, diolefinic hydrocarbons such as 2-methyl-1,3-butadiene, 1,2-pentadiene, 1,3-pentadiene and 3-methyl-1,2-butadiene are included.
  • the aromatic petroleum resin obtained by (co)polymerizing the C9 fraction is a resin obtained by polymerizing an aromatic having a carbon number of 9 with vinyltoluene and indene as the main monomers, and is produced by thermal decomposition of naphtha.
  • C9 fraction obtained examples include styrene homologues such as ⁇ -methylstyrene, ⁇ -methylstyrene and ⁇ -methylstyrene, and indene homologues such as indene and coumarone.
  • Trade names include Petrogin made by Mitsui Petrochemicals, Petolite made by Mikuni Chemicals, Neopolymer made by Nippon Petrochemicals, and Petcol made by Toyo Soda.
  • a modified petroleum resin obtained by modifying the petroleum resin composed of the C9 fraction can be preferably used.
  • the modified petroleum resin include C9 petroleum resin modified with an unsaturated alicyclic compound, C9 petroleum resin modified with a compound having a hydroxyl group, C9 petroleum resin modified with an unsaturated carboxylic acid compound, and the like. mentioned.
  • Preferable unsaturated alicyclic compounds include cyclopentadiene and methylcyclopentadiene. Further, as the unsaturated alicyclic compound, a Diels-Alder reaction product of alkylcyclopentadiene is also preferable. , tricyclopentadiene and the like. Dicyclopentadiene is particularly preferable as the unsaturated alicyclic compound.
  • a dicyclopentadiene-modified C9 petroleum resin can be obtained by thermal polymerization or the like in the presence of both dicyclopentadiene and a C9 fraction. Examples of the dicyclopentadiene-modified C9 petroleum resin include Neopolymer 130S (manufactured by Nippon Petrochemicals Co., Ltd.).
  • Examples of compounds having a hydroxyl group include alcohol compounds and phenol compounds.
  • Specific examples of alcohol compounds include alcohol compounds having double bonds such as allyl alcohol and 2-butene-1,4 diol.
  • As the phenol compound alkylphenols such as phenol, cresol, xylenol, p-tert-butylphenol, p-octylphenol, and p-nonylphenol can be used. These hydroxyl-containing compounds may be used alone, or two or more of them may be used in combination.
  • C9 petroleum resins having hydroxyl groups are produced by thermally polymerizing a (meth)acrylic acid alkyl ester or the like together with a petroleum fraction to introduce an ester group into the petroleum resin, and then reducing the ester group. It can be produced by a method of hydrating the double bond after remaining or introducing the double bond therein.
  • the C9 petroleum resin having a hydroxyl group those obtained by various methods as described above can be used, but from the viewpoint of performance and production, it is preferable to use a phenol-modified petroleum resin or the like.
  • the phenol-modified petroleum resin is obtained by cationic polymerization of a C9 fraction in the presence of phenol, is easy to modify, and is inexpensive. Examples of the phenol-modified C9 petroleum resin include Neopolymer E-130 (manufactured by Nippon Petrochemicals Co., Ltd.).
  • the C9 petroleum resin modified with the unsaturated carboxylic acid compound can be modified with an ethylenically unsaturated carboxylic acid.
  • ethylenically unsaturated carboxylic acids include (anhydrous) maleic acid, fumaric acid, itaconic acid, tetrahydro(anhydrous) phthalic acid, (meth)acrylic acid and citraconic acid.
  • the unsaturated carboxylic acid-modified C9 petroleum resin can be obtained by thermally polymerizing a C9 petroleum resin and an ethylenically unsaturated carboxylic acid.
  • maleic acid-modified C9 petroleum resins are preferred.
  • unsaturated carboxylic acid-modified C9 petroleum resins include Neopolymer 160 (manufactured by Nippon Petrochemicals Co., Ltd.).
  • a copolymer resin of C5 fraction and C9 fraction obtained by thermal decomposition of naphtha can be preferably used.
  • the C9 fraction is not particularly limited, but is preferably a C9 fraction obtained by thermal cracking of naphtha.
  • TS30, TS30-DL, TS35, TS35-DL, etc. of the Struktol series manufactured by SCHILL & SEILACHER can be mentioned.
  • examples of the phenolic resin include alkylphenol formaldehyde resins and rosin-modified products thereof, alkylphenol acetylene resins, modified alkylphenol resins, terpenephenol resins, and the like. Hitachi Chemical Co., Ltd.), p-tert-butylphenol acetylene resin colesine (BASF), and the like.
  • examples of coal-based resins include coumarone-indene resins
  • examples of xylene-based resins include xylene formaldehyde resins.
  • polybutene can also be used as a resin having tackifying properties.
  • the content of the tackifier is more than 0 parts by mass and 15 parts by mass with respect to 100 parts by mass of the rubber component from the viewpoint of further improving the adhesiveness of the rubber composition and further improving workability during tire molding. It is preferably less than or equal to part.
  • the RFID tag coating rubber composition of the present invention may or may not contain carbon black as a filler other than silica.
  • the content of carbon black is preferably 20 parts by mass or less with respect to 100 parts by mass of the rubber component, and is particularly preferably 0 parts by mass (that is, does not contain carbon black).
  • the content of carbon black is 20 parts by mass or less with respect to 100 parts by mass of the rubber component, the relative dielectric constant of the rubber composition decreases, and the communication distance of the RFID tag becomes longer.
  • the dielectric constant of the rubber composition is further lowered, further increasing the communication range of the RFID tag.
  • the method for producing the rubber composition is not particularly limited. It can be manufactured by extrusion or the like. Further, vulcanized rubber can be obtained by vulcanizing the obtained rubber composition.
  • the kneading conditions are not particularly limited, and various conditions such as the input volume of the kneading device, the rotation speed of the rotor, the ram pressure, the kneading temperature, the kneading time, the type of the kneading device, etc. It can be selected as appropriate.
  • the kneading device include Banbury mixers, intermixes, kneaders, rolls, etc., which are usually used for kneading rubber compositions.
  • heating conditions there are no particular restrictions on the heating conditions, and various conditions such as the heating temperature, heating time, and heating device can be appropriately selected according to the purpose.
  • the heating device include a heating roll machine or the like which is usually used for heating the rubber composition.
  • the extrusion conditions are also not particularly limited, and various conditions such as extrusion time, extrusion speed, extrusion equipment, and extrusion temperature can be appropriately selected according to the purpose.
  • the extrusion device include an extruder or the like that is usually used for extrusion of a rubber composition.
  • the extrusion temperature can be determined appropriately.
  • a molding vulcanizer with a mold used for vulcanization of a rubber composition can be used.
  • the temperature is, for example, about 100 to 190.degree.
  • the tire of the present invention is characterized by comprising an RFID tag coated with the RFID tag coating rubber composition described above.
  • the tire of the present invention has an RFID tag coated with the RFID tag coating rubber composition described above, and therefore has excellent communication performance and durability.
  • an RFID tag is generally made of materials such as metals and resins.
  • an RFID tag includes an electronic device portion and an antenna portion connected to the electronic device portion, the housing (or package) of the electronic device portion is made of resin, and the antenna portion is made of metal.
  • the RFID tag is coated in advance with an adhesive such as the trade name "Chemlok” (registered trademark) manufactured by Lord Co., Ltd. By doing so, it is possible to ensure sufficient adhesion between the RFID tag and the coating rubber.
  • the coating rubber of the RFID tag has an adjacent rubber member (for example, a side rubber to be described later). , stiffeners, etc.).
  • the RFID tag coating rubber composition described above has a high elastic modulus and is hard, and therefore has the effect of suppressing stress concentration on the RFID tag.
  • the RFID tag it is preferable to arrange the RFID tag in a portion of the tire that is relatively undistorted during running.
  • the stiffener disposed radially outward of the bead core embedded in the bead portion of the tire and the side rubber positioned outward in the tire width direction of the carcass of the side portion of the tire it is preferred to provide an RFID tag coated with a coating rubber composition. Further, in this embodiment, it is more preferable to dispose the RFID tag coated with the RFID tag coating rubber composition at a portion radially inward of the maximum width portion of the tire.
  • FIG. 1 is a cross-sectional view of one embodiment of the tire of the present invention.
  • a tire 1 shown in FIG. 1 has a pair of bead portions 2, a pair of side portions 3, and a tread portion 4 connected to both side portions 3, and extends like a toroid between the pair of bead portions 2.
  • the stiffener 8 consists of a relatively high-rigidity hard stiffener 8a adjacent to the outer side of the bead core 7 in the tire radial direction, and a relatively low-rigidity soft stiffener 8b adjacent to the tire radially outer side of the hard stiffener 8a.
  • a side rubber 9 is arranged outside the carcass 5 of the side portion 3 in the tire width direction.
  • the carcass 5 includes a main body portion 5a extending toroidally between a pair of bead cores 7, and a folded portion wound around each bead core 7 radially outward from the inner side to the outer side in the tire width direction. and a portion 5b.
  • the structure and number of plies of the carcass 5 are not limited to these.
  • the stiffener 8 is arranged between the main body portion 5a of the carcass 5 and its folded portion 5b.
  • a wire chafer 10 is disposed on the outer surface side of the folded portion 5b of the carcass 5, and the wire chafer 10 further extends along the outer side of the stiffener 8 in the tire width direction.
  • an RFID tag coated with a coating rubber 11 is placed on the inner side of the maximum width portion of the tire in the tire radial direction, between the side rubber 9 and the soft stiffener 8b, and on the outer side of the wire chafer 10 in the tire radial direction. 12 are placed.
  • the coating rubber composition for RFID tags described above is used for the coating rubber 11 .
  • the RFID tag 12 coated with the coating rubber 11 (RFID tag-rubber composite) is prepared by, for example, preparing two rubber sheets made of the above-described RFID tag coating rubber composition, and inserting the RFID tag 12 between the rubber sheets. It can be produced by sandwiching the By laminating the RFID tag-rubber composite together with other rubber members to form a raw tire and vulcanizing the raw tire, the tire of the present embodiment can be produced.
  • the tire 1 shown in FIG. 1 has a long communicable distance and excellent communication performance.
  • the rubber composition applied to the coating rubber 11 is sufficiently balanced in terms of crack resistance, adhesiveness with adjacent rubber members, and elastic modulus. Therefore, the tire 1 shown in FIG. Excellent in nature.
  • the tire of the present embodiment may be obtained by vulcanizing after molding using an unvulcanized rubber composition, or using semi-vulcanized rubber that has undergone a pre-vulcanization step or the like, depending on the type of tire to be applied. After molding, it may be obtained by further vulcanization.
  • the tire of the present embodiment is preferably a pneumatic tire, and the gas to be filled in the pneumatic tire may be normal air or oxygen partial pressure-adjusted air, or nitrogen, argon, helium, or other inert gas. Active gases can be used.
  • the dielectric constant of the vulcanized rubber composition is measured at 860 MHz using a dielectric constant measuring instrument. It is known from past measurements of relative permittivity that the relative permittivity can be estimated from the amount of carbon black in the rubber compound. Therefore, the dielectric constant is calculated by calculation.
  • Tensile strength (TB) and elastic modulus (M100) The tensile strength (TB; Tensile Strength at break) and 100% modulus value (M100) of the vulcanized rubber test piece were measured.
  • Tensile strength (TB) is based on JIS K 6251 (2017), the maximum tensile force (MPa) required to stretch a vulcanized rubber test piece with a thickness of 2 mm 100% at 25 ° C. and break it. measured as The 100% modulus value (M100) was measured as the modulus tensile elastic modulus (MPa) when a vulcanized rubber test piece with a thickness of 2 mm was stretched 100% at 25° C. based on JIS K 6251 (2017).
  • vulcanized rubber with a large elastic modulus can suppress stress concentration on the RFID tag, and can ensure adhesiveness with adjacent rubber members.

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PCT/JP2022/037918 2021-11-02 2022-10-11 Ｒｆｉｄタグ用コーティングゴム組成物及びタイヤ Ceased WO2023079913A1 (ja)

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EP22889736.9A EP4427948A4 (en) 2021-11-02 2022-10-11 RFID TAG COATING RUBBER COMPOSITION AND TIRES
US18/694,413 US20240392107A1 (en) 2021-11-02 2022-10-11 Rfid-tag coating rubber composition, and tire

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