TIRES

Abstract

[Object] An object of the present invention is to further improve durability. [Solution] A tire is provided comprising a carcass including a carcass cord, a belt including a belt cord provided on an outer side of the carcass in a tire radial direction, a band including a band cord containing a polyester fiber provided on an outer side of the belt in the tire radial direction, and a tread provided on an outer side of the band in the tire radial direction, wherein the belt cord is a cord composed of a filament and a diameter (mm) of the band cord and a diameter (mm) of the belt cord satisfy the following expression: |Diameter of band cord - Diameter of belt cord| < 0.40.

Description

Technical field

[0001] The present invention relates to a tire. State of the art

[0002] PTL 1 discloses a pneumatic tire comprising a carcass, a belt and a band. Citation listPatent literature

[0003] [PTL 1] Japanese Unexamined Patent Publication No. 2005-239069 Summary of the inventionTechnical problem

[0004] An object of the present invention is to further improve durability. Solution to the problem

[0005] According to one embodiment of the present invention, there is provided a tire comprising: a carcass containing a carcass cord; a belt including a belt cord and provided on an outer side of the carcass in a tire radial direction; a band including a band cord containing a polyester fiber and provided on an outer side of the belt in the tire radial direction; and a tread provided on an outer side of the belt in the tire radial direction, where the belt cord is a cord made up of four filaments, and a diameter (mm) of the band cord and a diameter (mm) of the belt cord satisfy the following expression: |Diameter of band cord−Diameter of belt cord|<0.40. Advantageous effects of the invention

[0006] According to the present invention, it is possible to further improve durability. Brief description of the drawings Fig. 1 is a schematic cross-sectional view for explanatory description of a structure of an example of a tire according to an embodiment of the present invention. Fig.2 is a schematic view for an explanatory description of measurement of bending stiffness. Description of Embodiments[1] Properties of tires according to the present invention

[0007] First, characteristics of a tire according to the present invention will be described. 1. Overview

[0008] A tire according to the present invention comprises a carcass containing a carcass cord; a belt containing a belt cord and provided on an outer side of the carcass in a tire radial direction; a band containing a band cord containing a polyester fiber and provided on an outer side of the belt in the tire radial direction; and a tread provided on an outer side of the band in the tire radial direction. Furthermore, the belt cord is a cord composed of a filament. Furthermore, a diameter (mm) of the band cord and a diameter (mm) of the belt cord satisfy the following expression: |Diameter of band cord−Diameter of belt cord|<0.40.

[0009] Since these properties are provided, it is possible to further improve durability, as described later.

[0010] It should be noted that in the above description, the term "cord diameter" in the diameter of the band cord and the diameter of the belt cord refers to a diameter in a case where a circumscribed circle of a cross section perpendicular to an extending direction of the cord is a perfect circle, and it refers to an equivalent circle diameter (a diameter of a perfect circle in a case where a perfect circle having the same cross-sectional area is assumed) in a case of an ellipse or the like. For example, the "cord diameter" of the band cord can be measured in accordance with a method specified in JIS L 1017:2002 "Test methods for chemical fiber tire cords." The "cord diameter" of the belt cord can be measured in accordance with a test method specified in JIS G 3510:1992 "Testing methods for steel tire cords." 2. Mechanism for showing effect in tires according to the present invention

[0011] A mechanism for exhibiting the above-described effect in the tire according to the present invention is designed as follows.

[0012] In the tire according to the present invention, the belt cord is composed of a filament, and the difference between the diameter (mm) of the band cord and the diameter (mm) of the belt cord is set to be small, and specifically, it is set to satisfy |Diameter of Band Cord - Diameter of Belt Cord| < 0.40. As a result, the diameter of the belt cord can be reduced, the thickness of the rubber (rubber thickness) applied to the belt cord can be reduced, and the difference between the tension of the band and the tension of the belt can also be reduced. Therefore, it is believed that the looseness between the band and the belt is sufficiently suppressed, which also makes it possible to improve durability.

[0013] In terms of durability, |diameter of band cord - diameter of belt cord| is more preferably 0.30 or less, even more preferably 0.20 or less, even more preferably 0.10 or less, and even more preferably 0.05 or less. In terms of ride comfort, |diameter of band cord - diameter of belt cord| is preferably 0.15 or more, more preferably 0.16 or more, and even more preferably 0.17 or more, even more preferably 0.19 or more, preferably 0.20 or more, more preferably 0.25 or more, and even more preferably 0.30 or more. [2] Further preferred aspect of tires according to the present invention

[0014] The tire according to the present invention can achieve a greater effect by utilizing the following aspect. 1. Ends of band cord and belt cord

[0015] In the present invention, it is preferred that the difference between ends E BA of the band cord and ends EBE of the belt cord is small. This makes it possible to further reduce the difference between the tension of the band and the tension of the belt. Therefore, it is assumed that the looseness between the band and the belt is further suppressed, making it possible to further improve durability. It should be noted in the present specification that "ends" means "the number of cords per 50 mm in width in a tire width direction." The "ends" can be measured, for example, in accordance with a method specified in JIS L 1017:2002 "Test methods for chemical fiber tire cords."

[0016] In particular, it is believed that durability can be further improved in a case where the difference is allowed to |E BA - E BE | < 30. It should be noted that |E BA - E BE| is preferably 15 or less, more preferably 10 or less, even more preferably 5 or less, and most preferably 0. 2. Bending stiffness of belt cord

[0017] In the present invention, it is preferable that the bending rigidity of the belt cord be low. This reduces the tension difference between the belt cord and the band cord because the belt cord becomes more flexible. Therefore, it is believed that durability can be further improved.

[0018] In particular, in a case where |E BA - E BE | is less than 40 (g / cm), it is assumed that the durability can be further improved. |E BA - E BE | is more preferably 34.9 (g / cm) or less, even more preferably 30 (g / cm) or less, even more preferably 20 (g / cm) or less, and even more preferably 11.3 (g / cm) or less.

[0019] It should be noted that the bending stiffness of the belt cord described above can be measured, for example, by using a stiffness testing machine (e.g., 150-D type) manufactured by TABER Industries (USA) in accordance with the following procedure. First, both ends of a belt cord with a length of 145 mm are attached to clamps of a stiffness testing machine, and as shown in Fig. 2, a bending angle of +15 degrees and a bending angle of -15 degrees are applied to the belt cord 10. Then, an average value of the bending moment at +15 degrees and the bending moment at -15 degrees is defined as a bending stiffness value (g-cm). 3. Average elongation and heat shrinkage rate of band cord

[0020] In the present invention, it is preferable that both the average elongation degree and the heat shrinkage rate of the band cord be low. This further improves dimensional stability, making the band less susceptible to elongation and approaching the hardness of the belt. Therefore, it is expected that the looseness between the band and the belt is further suppressed, making it possible to further improve durability.

[0021] In particular, in a case where the sum of the average elongation ratio (%) and the heat shrinkage rate (%) of the tape cord is less than 15, it is considered that the durability can be further improved. The sum thereof is more preferably 12 or less, and even more preferably 10 or less.

[0022] It should be noted that the average elongation ratio of the tape cord (%) can be determined from an elongation ratio (%) under a load of 44 N in a “load-elongation” curve of the tape cord obtained in an environment of room temperature (25 °C ± 2 °C) in accordance with “JIS L 1017:2002 Test methods for chemical fiber tire cords”.

[0023] In addition, the heat shrinkage rate (%) of the tape cord can be determined from a ratio y / x (%) of an amount of shrinkage y (mm) to a length x (mm) of the tape cord before being allowed to rest in a case where the tape cord is allowed to rest in a no-load state and at a temperature of 180 °C for 30 minutes in accordance with “JIS L 1017:2002 Test methods for chemical fiber tire cords”.

[0024] The band may have one layer or two layers. Furthermore, the band may be formed across the entire width direction of the tread or may be formed only in both end portions of the tread. The band cord may be composed of fibers. As the fiber constituting the band cord, a polyester fiber may be used, and a polyethylene terephthalate (PET) fiber or a polyethylene naphthalate (PEN) fiber is preferable, and a PET fiber is more preferable. Furthermore, the fibers constituting the band cord may be fibers recycled from used articles or waste articles, or may be fibers synthesized from biomass. 4. Use of sustainable materials

[0025] In the tire according to the present invention, the belt, band, and carcass ply described above are produced by coating both surfaces of a cord assembly body with a rubber composition publicly known in the art. However, considering the recent strong demand for environmental protection, it is preferable to replace a material constituting these rubber compositions with a sustainable material. (1) Rubber material

[0026] For example, as a raw material (monomer) of a synthetic rubber such as SBR or BR, instead of a petroleum-derived material, a material recycled from a rubber product such as a tire or a non-rubber product such as polystyrene may be used.

[0027] The monomer obtained by recycling (recycled monomer) is not particularly limited, and examples thereof include butadiene derived from recycling and aromatic vinyl derived from recycling. Examples of butadiene include 1,2-butadiene and 1,3-butadiene. Furthermore, aromatic vinyl is not particularly limited, and examples thereof include styrene. Among them, it is preferable to use butadiene (recycled butadiene) and / or styrene (recycled styrene) derived from recycling as a raw material.

[0028] A production method for the recycled monomer is not particularly limited, and an example thereof includes a method in which the recycled monomer is synthesized from recycled naphtha obtained by decomposing a rubber product such as a tire. Furthermore, a production method for the recycled naphtha is not particularly limited, and for example, a rubber product such as a tire may be decomposed under high temperature and pressure, may be decomposed using a microwave oven, or may be extracted after mechanical crushing.

[0029] Furthermore, the raw material (monomer) of the synthetic rubber such as SBR or BR may be a raw material derived from biomass. The biomass-derived monomer (biomass monomer) is not particularly limited, and examples thereof include a biomass-derived butadiene and a biomass-derived aromatic vinyl compound. Examples of the butadiene include 1,2-butadiene and 1,3-butadiene. The aromatic vinyl is not particularly limited, and examples thereof include styrene. Furthermore, a production method for the biomass monomer is not particularly limited, and examples thereof include those obtained by biological and / or chemical and / or physical conversion of animals and plants.Fermentation by microorganisms is typical for biological conversion, and chemical and / or physical conversion includes catalyst conversion, high-temperature conversion, high-pressure conversion, electromagnetic wave conversion, critical fluid conversion, and a combination thereof. Examples of biomass sources of these monomers include sugar, wood, plant residues after capture of useful components, plant-derived ethanol, and biomass naphtha.

[0030] A polymer synthesized from the biomass monomer component (biomass polymer) is not particularly limited, and examples thereof include polybutadiene rubber synthesized from biomass-derived butadiene, and an aromatic vinyl-butadiene copolymer synthesized from biomass-derived butadiene and / or biomass-derived aromatic vinyl. Examples of the aromatic vinyl-butadiene copolymer include a styrene-butadiene rubber synthesized from biomass-derived butadiene and / or biomass-derived styrene.

[0031] It should be noted that whether the polymer raw material is derived from biomass or not can be determined by pMC (Percent Modern Carbon) measured in accordance with D6866-10.

[0032] The pMC is a ratio of a 14 C concentration of a sample to a 14C concentration of the modern standard reference carbon (modern standard reference), and this value is used as an index indicating the biomass content of the compound (rubber). The meaning of this value is described below.

[0033] In one mole of carbon atoms (6.02 × 10 23 atoms) are about 6.02 × 10 11 Atoms of 14 C, which is about one trillionth of the total number of carbon atoms. 14 C is referred to as a radioisotope, has a half-life of 5,730 years, and its amount decreases regularly. It takes 22.6 thousand years for its complete decay. Therefore, for fossil fuels such as coal, petroleum, and natural gas, where it may take 22.6 thousand years or more after carbon dioxide and the like in the air were incorporated into plants and the like and then fixed, all 14C elements initially contained in them decay. Therefore, fossil fuels such as coal, petroleum and natural gas do not contain any 14 C elements. Therefore, the chemical substances produced from these fossil fuels as raw materials do not contain any 14 C elements.

[0034] On the other hand, 14 C is constantly produced by the nuclear reaction of cosmic rays in the air, the production of 14 C is balanced with a decrease due to radioactive decay, and thus the amount of 14 C is a constant amount in the Earth's atmospheric environment. As a result, the 14 C concentration of the substance derived from biomass resources that is under substance circulation in the current environment, a value of approximately 1 × 10 -12Mol% or so with respect to the total S atoms, as described above. Consequently, the rate (biomass fraction) of the compound derived from a natural resource (a compound derived from a biomass resource) in a specific compound (rubber) can be calculated by using the difference between these values.

[0035] This 14 C is generally measured as follows. The accelerator mass spectrometry method using a tandem accelerator is used to 13 C concentration ( 13 C / 12 C}) and a 14 C concentration ( 14 C / 12 C) to measure. During the measurement, the 14 C concentration in the circulating carbon in the natural world in 1950 as the modern standard reference, which serves as the reference for the concentration of 14C. An oxalic acid standard substance provided by the National Institute of Standards and Technology (NIST) is used as a specific standard substance. The specific radioactivity of carbon in oxalic acid (the radioactivity intensity of 14 C per 1 g of carbon) is separated for each carbon isotope, for 13 C is corrected to a constant value and subjected to an attenuation correction from 1950 to the measurement date, resulting in a value that is considered to be the value (100%) of the standard 14 C concentration is to be used. The ratio of this value to the value of the actually measured sample is the pMC value.

[0036] As a result, in a case where the rubber is made from 100% of a substance derived from biomass (nature-based), although there is a regional difference or the like, and thus the rubber has a value of approximately 110 pMC (currently, the rubber in a normal state often does not reach 100). On the other hand, in a case where the 14 When the C concentration of a chemical derived from a fossil fuel, such as petroleum, is measured, the chemical is approximately 0 pMC (e.g., 0.3 pMC). This value corresponds to 0% of the biomass fraction described above.

[0037] From the above, it is suitable to use in the rubber composition a material such as rubber with a high pMC value, that is, a material such as rubber with a high biomass content in terms of environmental protection.

[0038] In addition, it is also preferable to use vulcanized rubber particles as the rubber material.

[0039] Vulcanized rubber particles are particles containing vulcanized rubber as a material. Specifically, rubber powder or the like specified in JIS K 6316:2017 can be used. From the viewpoint of environmental and cost considerations, reclaimed rubber powder made from a powder product of a scrap tire or the like is preferred. One type can be used alone, or two or more types can be used in combination.

[0040] The vulcanized rubber particles are not particularly limited and may be unmodified vulcanized rubber particles or may be modified vulcanized rubber particles.

[0041] As a commercially available product of the vulcanized rubber particles, for example, a product of Lehigh Technologies, Inc., MURAOKA RUBBER RECLAIMING Co., Ltd. or the like can be used. (2) Silicon dioxide

[0042] The rubber composition generally contains silica as a reinforcing filler. However, it is also preferred to use sustainable silica instead of a mineral-derived raw material, such as quartz.

[0043] The silica is not particularly limited, and it is possible to use those commonly used in the tire industry, for example, silica (anhydrous silica) produced by a dry-type method and silica (hydrous silica) produced by a wet-type method. The raw material of silica is not particularly limited. For example, it may be a mineral-derived raw material such as quartz, or it may be a biologically derived raw material such as rice husk (for example, silica obtained by using a biomass material such as rice husk as a raw material). Recycled silica from a product containing silica can also be used.Among the above, hydrous silica produced by a wet-type method is preferred because the number of silanol groups is large. This silica can be used alone, or two or more of them can be used in combination.

[0044] Silica obtained by using a biomass material as a raw material can be obtained, for example, by extracting a silicate from rice husk ash obtained by burning rice husks, using a sodium hydroxide solution, and then filtering, washing, drying, and crushing a precipitate of silica produced by reacting the silicate with sulfuric acid in the same manner as in the case of the wet-type silica in the prior art.

[0045] For the silica recycled from a product containing silica, silica recovered from a product containing silica, for example, an electronic component such as a semiconductor, or a filter material such as a tire, a desiccant, or diatomaceous earth, can be used. Furthermore, a method for performing recovery is not particularly limited, and examples thereof include thermal decomposition, electromagnetic wave decomposition, and the like. Among the above, silica recovered from an electronic component such as a semiconductor or from a tire is preferable.

[0046] In a case where silicon dioxide is crystallized, it is not dissolved in water, and the component of silicon dioxide, i.e., silicic acid, cannot be used. By controlling the combustion temperature and combustion time, it is possible to suppress the crystallization of silicon dioxide in rice husk ash (see Japanese Unexamined Patent Publication No. 2009-2594, Akita Prefectural University Web Journal B / 2019, vol. 6, pp. 216-222, and the like).

[0047] For the amorphous silica extracted from rice husks, amorphous silica commercially available from Wilmar International Limited and the like can be used. (3) Soot

[0048] In addition, it is also common for the rubber composition to contain carbon black as a reinforcing filler, and it is also preferable to use a sustainable carbon black as such a carbon black.

[0049] The carbon black is not particularly limited, and examples thereof include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, and N762. The raw material of the carbon black may be a biomass material such as lignin or vegetable oil, or may be a thermally decomposed oil obtained by subjecting a scrap tire to thermal decomposition. Furthermore, a production method for the carbon black may be a combustion production method such as a furnace process, a hydrothermal carbonization (HTC) production method, or a methane thermal decomposition production method by a thermal carbon black process, or the like. As a commercially available product thereof, it is possible to use a product manufactured by ASAHI CARBON CO., LTD., Cabot Japan KK, TOKAI CARBON CO., LTD., Mitsubishi Chemical Corporation, Lion Specialty Chemicals Co., Ltd., NIPPON STEEL Chemical & Material Co., Ltd., or Columbia Carbon. These can be used alone, or two or more types can be used in combination. (4) Oil

[0050] Examples of the oil commonly used as the softening agent include a process oil, a vegetable oil, and an animal oil. Examples of the process oil include a paraffin-based process oil (mineral oil), a naphthene-based process oil, and an aromatic process oil. Specific examples of the process oil include mild extract solvate (MES), distillate aromatic extract (DAE), treated distillate aromatic extract (TDAE), treated residual aromatic extract (TRAE), and residual aromatic extract (RAE). In addition, a process oil with a low polycyclic aromatic compound (PCA) content can also be used for environmental measures. Examples of the low PCA process oil include MES, TDAE, and a heavy naphthene-based oil.In addition, from the point of view of life cycle assessment, a waste oil used in a rubber mixer or an engine or an oil obtained by refining a waste cooking oil used in a restaurant can be used.

[0051] In addition, specific examples of vegetable oil include linseed oil, rapeseed oil, safflower oil, soybean oil, corn oil, cottonseed oil, rice bran oil, tall oil, sesame oil, wild sesame oil, castor oil, tung oil, pine oil, pine tar oil, sunflower oil, coconut oil, palm oil, palm kernel oil, olive oil, camellia oil, jojoba oil, macadamia nut oil, peanut oil, grapeseed oil and Japanese wax.Further, examples of the vegetable oil also include vegetable oils such as a refined oil (salad oil or the like) obtained by refining the above-described oil, an ester-exchange oil obtained by subjecting the above-described oil to ester exchange, a hardened oil obtained by hydrogenating the above-described oil, a thermally polymerized oil obtained by subjecting the above-described oil to thermal polymerization, an oxidatively polymerized oil obtained by subjecting the above-described oil to oxidation, and a used cooking oil obtained by reclaiming the oil used as cooking oil. Note that the vegetable oil may be a liquid or a solid at normal temperature (25°C). These vegetable oils may be used alone, or two or more types thereof may be used in combination.

[0052] The vegetable oil preferably contains acylglycerol, and more preferably contains triacylglycerol. Here, the acylglycerol refers to a compound obtained by subjecting a hydroxy group of glycerin and a fatty acid to an ester bond. The acylglycerol is not particularly limited, and it may be 1-monoacylglycerol, may be 2-monoacylglycerol, may be 1,2-diacylglycerol, may be 1,3-diacylglycerol, or may be triacylglycerol. Further, the acylglycerol may be a monomer, may be a dimer, or may be a multimer that is a trimer or more. Note that an acylglycerol that is a dimer or more can be obtained by thermal polymerization, oxidative polymerization, or the like. Furthermore, the acylglycerol may be a liquid or a solid at normal temperature (25°C).

[0053] A method of checking whether the acylglycerol is contained in the rubber composition or not is not particularly limited; however, the check may be carried out by 1 H-NMR measurement can be performed. For example, in a case where a rubber composition mixed with triacylglycerol is immersed in heavy chloroform for 24 hours at normal temperature (25 °C), the rubber composition is removed, 1 When H NMR is subsequently measured at room temperature and a signal from tetramethylsilane (TMS) is set at 0.00 ppm, signals of approximately 5.26 ppm, approximately 4.28 ppm, and approximately 4.15 ppm are observed. These signals are believed to be signals derived from a hydrogen atom bonded to a carbon atom adjacent to the oxygen atom of the ester group. Note that the term "approximately" in this paragraph is a range of ±0.10 ppm.

[0054] The fatty acid is not particularly limited and can be an unsaturated fatty acid or a saturated fatty acid. Examples of unsaturated fatty acids include monovalent unsaturated fatty acids such as oleic acid and polyvalent unsaturated fatty acids such as linoleic acid or linolenic acid. Furthermore, examples of saturated fatty acids include butyric acid and lauric acid.

[0055] Among them, it is desirable that the fatty acid contains a fatty acid having a small number of double bonds, that is, a saturated fatty acid or a monovalent unsaturated fatty acid, and oleic acid is preferred. As the vegetable oil containing such a fatty acid, for example, a vegetable oil containing a saturated fatty acid or a monovalent unsaturated fatty acid can be used, or a vegetable oil subjected to modification such as ester exchange can be used. Furthermore, a plant for producing a vegetable oil containing such a fatty acid can be improved by breeding, genetic recombination, genome editing, or the like.

[0056] As the vegetable oil, it is possible to use those commercially available from, for example, Idemitsu Kosan Co., Ltd., SANKYO YUKA KOGYO KK, ENEOS Corporation, Olisoy, H&R Group, HOKOKU CORPORATION, Fuji Kosan Company, Ltd. and Nisshin OilliO Group, Ltd. (5) Softeners other than oil

[0057] In addition to the oil described above, the rubber composition also contains a liquid (liquid-like) softener at normal temperature (25°C) or a solid softener at normal temperature (25°C) as a softener that imparts plasticity to the rubber component. Examples of such a softener include a resin component, a liquid polymer, and an ester-based plasticizer. The softener may be a softener derived from petroleum, a softener derived from biomass, or a softener derived from naphtha recycled from rubber products or non-rubber products (sustainable softener).In addition, a low-molecular-weight hydrocarbon component obtained by thermal decomposition and extraction of a scrap tire or used product containing various components can be used as a softening agent. These softening agents can be used alone, or two or more types can be used in combination. (6) Wax

[0058] The rubber composition generally contains wax, and the wax is not particularly limited. Any wax commonly used in the tire industry can be suitably used. Examples of the wax include a petroleum-based wax, a mineral-based wax, a synthetic wax, and a plant-derived wax. Among the above, a petroleum-based wax or a plant-derived wax is preferable, and a petroleum-based wax is more preferable. Examples of the plant-derived wax include a rice wax, a carnauba wax, and a candelilla wax. Examples of the petroleum-based wax include a paraffin wax, a microcrystalline wax, and a carefully selected special wax thereof, and a paraffin wax is preferable. As the wax, a wax commercially available from, for example, OUCHI SHINKO CHEMICAL INDUSTRIAL CO., LTD., NIPPON SEIRO Co., Ltd., or Paramelt BV can be used.These waxes can be used alone, or two or more of them can be used in combination. (7) Antioxidants

[0059] The rubber composition generally contains an antioxidant. The antioxidant is not particularly limited, and examples thereof include a naphthylamine-based antioxidant such as phenyl-α-naphthylamine; a diphenylamine-based antioxidant such as octylated diphenylamine or 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine; a p-phenylenediamine-based antioxidant such as N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD), N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine (77PD), N,N'-diphenyl-p-phenylenediamine (DPPD), N,N'-ditolyl-p-phenylenediamine (DTPD), N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD), or N,N'-di-2-naphthyl-p-phenylenediamine (DNPD); a quinoline-based antioxidant such as a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline;a monophenol-based antioxidant such as 2,6-di-t-butyl-4-methylphenol or styrenated phenol; a bis-, tris-, or polyphenol-based antioxidant such as tetrakis[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane. Among the above, a p-phenylenediamine-based antioxidant or a quinoline-based antioxidant is preferable, and a polymer of N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine and 2,2,4-trimethyl-1,2-dihydroquinoline is more preferable. As a commercially available product thereof, it is possible to use a product manufactured by, for example, Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., OUCHI SHINKO CHEMICAL INDUSTRIAL CO., LTD. or FLEXSYS.;

[0060] It should be noted that various materials (e.g., a rubber, oil, a resin, a vulcanization accelerator, an antioxidant, and a surfactant) containing a carbon atom can be derived from carbon dioxide in the air. Regarding a method for obtaining a mixture according to the present invention from carbon dioxide, carbon dioxide can be subjected to direct conversion, or methane obtained by a methanation process of synthesizing methane from carbon dioxide can be converted. [3] Embodiment

[0061] Hereinafter, the present invention will be specifically described based on the embodiments. 1. Tires according to the present embodiment

[0062] Fig.1 is a schematic cross-sectional view for explanatory description of a structure of an example of a tire according to the present embodiment, and shows a tire meridian cross section including a rotational axis of the tire in a normal state.

[0063] Here, the term “normal condition” refers to a condition in which the tire has undergone rim mounting on a normal rim, normal internal pressure has been applied, and there is no additional load.

[0064] It should be noted that the term "normal rim" is a rim defined for each tire by a standard in a standards system that includes the standard on which the tire is based. For example, in a case of The Japan Automobile Tire Manufacturers Association (JATMA), it refers to a standard rim with respect to the applicable size described in "JATMA YEAR BOOK", in a case of The European Tire and Rim Technical Organization (ETRTO), it refers to "Measuring Rim" described in "STANDARDS MANUAL", or in a case of The Tire and Rim Association (TRA), it refers to "Design Rim" described in "YEAR BOOK". Here, JATMA, ETRTO, and TRA are referred to in that order, following a standard with respect to an applicable size in a case where there is an applicable size in a case of reference.In addition, the normal rim refers to a rim that, in a case where the tire is not defined in the standard, is capable of subjecting a tire to rim mounting while maintaining an internal pressure, that is, a rim with the smallest rim diameter and then a rim with the narrowest rim width among rims that do not cause air leakage between a rim and a tire.

[0065] In addition, the term "normal internal pressure" refers to air pressure defined for each tire by each standard in a standards system that includes the standard on which the tire is based, and it refers to "the maximum air pressure" in a case of JATMA, "INFLATION PRESSURE" in a case of ETRTO, or to the maximum value described in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" in a case of TRA. Here, JATMA, ETRTO, and TRA are referred to in that order, following a standard with respect to an applicable size in a case where there is an applicable size in a case of reference.In the case of a tire not defined in the standard, the normal internal pressure refers to a normal internal pressure (which is 250 kPa or more) with respect to a different tire size (defined in the standard) described for the normal rim described above as a standard rim. Note that in a case where multiple normal internal pressures of 250 kPa or more are described, reference is made to the minimum value below.

[0066] As in Fig. 1, a tire 1 includes a tread 2, a sidewall 3, a bead 4, a carcass 6, and a belt 7. It should be noted that C indicates a center line. In addition, Fig. 1 the description of the band arranged between the carcass and the tread is omitted. (1) Carcass

[0067] The carcass 6 is constructed of one carcass ply 6A and is locked by folding the periphery of the bead core 5 of the bead 4 from the tread 2 through the sidewall 3 (1-0 structure) from the inside out. The carcass 6 may be constructed of two carcass plies. Moreover, a material publicly known in the art, for example, a polyester fiber such as polyethylene terephthalate (PET) fiber or polyethylene naphthalate (PEN) fiber, a polyamide fiber such as nylon 6 fiber or nylon 66 fiber, an aramid fiber, or the like, may be used as the material of the carcass cord. The fibers constituting the carcass cord may be fibers recycled from used articles or waste articles, or may be fibers synthesized from biomass.

[0068] It is in Fig.1, 6a is an inner main body portion of the carcass ply 6A, 6b is an outer folded portion, and, for example, a bead tapex rubber 8 extending from the bead core 5 outward in the tire radial direction is disposed between the inner main body portion 6a and the outer folded portion 6b.

[0069] The carcass ply 6A is configured to be covered with a predetermined rubber composition for a carcass ply on both surfaces of a cord arranging body in which a ply cord having a predetermined thread density is arranged to have predetermined ends (not shown in the drawing).

[0070] It is noted in the present invention that a synthetic polyester fiber with a high modulus is used for the ply cord. (2) Belt

[0071] The belt 7 is arranged on an outer side of the carcass 6 in the radial direction and on an inner side of the tread 2.

[0072] The belt 7 is constructed from one or more (one, two or three or more) belt layers, and in Fig. 1, the belt layer 7 is composed of a first belt ply 7A located on the inner side in the tire radial direction and a second belt ply 7B located on the outer side of the first belt ply 7A. Note that three or more belt plies may be used.

[0073] The belt ply is produced by covering a predetermined rubber composition for a belt on both surfaces of a cord arranging body so as to have a thinner thickness than that of the carcass ply, in which a cord (belt cord) composed of a filament is arranged to have predetermined ends (not shown in the drawing). The filament configuring the belt cord is preferably made of a metal, and in particular, it is more preferably made of iron. Moreover, it is preferable that the cross-sectional shape thereof be a circular shape; however, it may be an elliptical shape. Furthermore, the filament may be corrugated, and it may be a filament subjected to a plating treatment. In the present embodiment, a filament having a circular cross-sectional shape in a non-twisted state without being corrugated is used.

[0074] It is believed that durability can be improved by using such a belt 7. 2. Manufacturing of tires

[0075] The tire according to the present embodiment can be manufactured by a typical method.

[0076] Specifically, an inner liner as a member for ensuring the airtightness retention property of the tire, a carcass as a member that withstands the load, impact, and inflation air pressure applied to the tire, a belt as a member that tightly tightens the carcass and increases the rigidity of the tread, and the like are wound on a forming drum, and a bead as a member for fixing the tire to the rim is arranged while both ends of the carcass ply are attached to edge portions on both sides, forming it into a toroidal shape. Then, the tread is bonded to a center portion of an outer circumference, and the sidewall is bonded to an outer side in the radial direction to form a side portion, thereby producing an unvulcanized tire.

[0077] Thereafter, the unvulcanized tire produced as described above is subjected to heating and pressurization in a vulcanizing machine to obtain a tire. The vulcanization process can be performed by applying a publicly known vulcanizing agent. A vulcanization temperature is, for example, higher than 120°C and lower than 200°C, and a vulcanization time is, for example, more than 5 minutes and less than 15 minutes.

[0078] In the tire obtained as described above, the belt and band are appropriately formed as described above. Therefore, it is possible to further improve durability.

[0079] Furthermore, the tire according to the present invention can be suitably used as a tire for a passenger car, a tire for a large passenger car, a tire for a large SUV, a tire for a small truck, or the like. [Examples]

[0080] Hereinafter, examples (Examples) considered preferable in carrying out the present embodiment are shown; however, the scope of the present invention is not limited to these Examples.

[0081] Tires are manufactured in Fig.1 (tire size: 195 / 65R15), wherein the tires are substantially the same except for the belt and band of each specification shown in Table 1, and the results of durability and low fuel consumption characteristics calculated based on the evaluation method described later are shown together in the lower part of Table 1. 1. Assessment of durability

[0082] Each test tire is installed on a rim (size = 15 × 6J), the tire is inflated with air, the internal pressure is adjusted to 230 kPa, the tire is mounted on a drum test machine, a vertical load of 5.88 kN is applied, and the speed is increased by 10 km / h stepwise from 210 km / h to measure a time until the tire is damaged.

[0083] Next, the result for Comparative Example 1 is set to 100, and durability evaluation is performed by indexing based on the following expression. A larger numerical value indicates a longer time to failure and excellent durability after high-speed driving. Durability Rating = [(Result of Test Tire) / (Result of Comparative Example 1)] × 100 2. Evaluation of low fuel consumption properties

[0084] Using a rolling resistance testing machine, a rolling resistance coefficient (RRC) is measured in a case where each test tire is subjected to running on a drum at a speed of 80 km / h under the following conditions. Rim to be used: 15 × 6 J Internal pressure: 210 kPa Load: 4.35 kN

[0085] Next, the result for Comparative Example 1 is set to 100, and the evaluation of low fuel consumption characteristics is performed by indexing based on the following expression. It indicates that the larger the numerical value, the better the low fuel consumption characteristics.

[0086] Evaluation of properties of low Evaluation of low fuel consumption properties = [(Result of Comparative Example 1) / (Result of test tires)] × 100 3. Overall performance

[0087] The overall performance is indicated by a sum of an index of durability and an index of low fuel consumption characteristics. [Table 1] Comparison example Example 1 2 3 4 5 1 2 3 4 5 (Belt) configuration 1 × 1 2 + 2 1 × 1 1 × 2 1 × 1 1 × 1 1 × 1 1 × 1 1 × 1 1 × 1 Cord diameter A (mm) 0,3 0,75 0,45 0,75 0,25 0,45 0,45 0,5 0,3 0,4 The end E BE (Cord) 80 90 85 60 80 80 85 60 45 50 Bending stiffness (g cm) 11,3 45,2 55,5 41,2 5,5 55,5 55,5 84,3 11,3 34, 9 (Band) Cord diameter C (mm) 0,75 0,35 0, 85 0,35 0,7 0, 65 0,4 0, 6 0, 6 0, 6 The end E BA (Cord) 45 45 50 50 45 45 50 50 50 50 Average degree of elongation E (%) 4 7 7 7 7 7 7 7 7 4 Heat shrinkage rate F (%) 8 10 10 10 10 10 10 10 10 8 (Parameter) |c - A| 0,45 0,4 0,4 0,4 0,45 0,2 0, 05 0, 1 0,3 0,2 |And BA - AND BE | 35 45 35 10 35 35 35 10 5 0 E + F 12 17 17 17 17 17 17 17 17 12 (Evaluation) durability 100 99 97 100 99 104 102 106 113 118 Low fuel consumption characteristics 100 98 100 98 100 103 105 101 103 103

[0088] The present invention has been described above based on the embodiments. However, the present invention is not limited to the above-described embodiments. Various modifications can be made to the above-described embodiments within the same and similar ranges as those of the present invention.

[0089] The present invention (1) is a tire characterized by comprising: a carcass containing a carcass cord; a belt including a belt cord and provided on an outer side of the carcass in a tire radial direction; a band including a band cord containing a polyester fiber and provided on an outer side of the belt in the tire radial direction; and a tread provided on an outer side of the belt in the tire radial direction, wherein the belt cord is a cord composed of a filament, and a diameter (mm) of the band cord and a diameter (mm) of the belt cord satisfy the following expression: |Diameter of band cord−Diameter of belt cord|<0.40. .

[0090] The present invention (2) is the tire according to the present invention (1), which is characterized in that the number of cords E BA per 50 mm in width for the band layer cord and the number of cords E BE per 50 mm in width of the belt cord meet the following expression: |EBA−EBE|<30.

[0091] The present invention (3) is the tire according to the present invention (1) or the present invention (2), which is characterized in that a bending stiffness of the belt cord is less than 40 (g-cm).

[0092] The present invention (4) is the tire according to any combination of the present inventions (1) to (3), characterized in that a sum of an average elongation ratio (%) and a heat shrinkage rate (%) of the tape cord is less than 15. List of reference symbols 1 tire 2 running surface 3 side wall 4 bead 5 bead core 6 Carcass 6A carcass ply 6a inner main body section 6b outer folded section 7 belts 7A first belt layer 7B second belt layer 8 Bead Apex rubber 10 band cord C Centerline QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2005-239069

[0003] JP 2009-2594

[0046]

Claims

[1] Tires, comprising: a carcass containing a carcass cord; a belt including a belt cord and provided on an outer side of the carcass in a tire radial direction; a band including a band cord containing a polyester fiber and provided on an outer side of the belt in the tire radial direction; and a tread provided on an outer side of the belt in the tire radial direction, wherein the belt cord is a cord composed of a filament, and a diameter (mm) of the band cord and a diameter (mm) of the belt cord satisfy the following expression: |Diameter of band cord−Diameter of belt cord|<0.

40. [2] A tire according to claim 1, wherein the number of cords E BA per 50 mm in width for the band layer cord and the number of cords E BEper 50 mm in width of the belt cord meet the following expression: |EBA−EBE|<30. [3] The tire according to claim 1 or 2, wherein a bending rigidity of the belt cord is less than 40 (g-cm). [4] A tire according to any one of claims 1 to 3, wherein a sum of an average elongation ratio (%) and a heat shrinkage rate (%) of the band cord is less than 15.

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