Classifications

• • 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
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
  • C08K5/34—Heterocyclic compounds having nitrogen in the ring
  • C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
  • C08K5/3432—Six-membered rings
  • C08K5/3437—Six-membered rings condensed with carbocyclic rings
• • 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
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
  • C08K5/17—Amines; Quaternary ammonium compounds
  • C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
• • 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
  • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
  • B60C1/0008—Compositions of the inner liner
• • 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
  • B60C1/0016—Compositions of the tread
• • 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
  • B60C1/0025—Compositions of the sidewalls
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
  • C08L9/06—Copolymers with styrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
  • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
  • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Definitions

• the present invention relates to rubber compositions for tires and tires.
• various rubber members that constitute a tire may deteriorate under the influence of the ambient environment such as the presence of ozone, and as the deterioration progresses, cracks and the like may occur.
• rubber compositions containing anti-aging agents are often applied to various rubber members constituting tires.
• a specific quinoline antioxidant and N-phenyl-N'-(1,3-dimethylbutyl)-p-phenylenediamine (antiaging agent 6PPD) are selected and blended. It is disclosed that cracks and discoloration of the tire surface can be suppressed by applying the resulting rubber composition to the rubber constituting the surface of the tire.
• the N-phenyl-N'-(1,3-dimethylbutyl)-p-phenylenediamine (antiaging agent 6PPD) used in Patent Document 1 above may have an impact on the environment. , it is desirable to use anti-aging agents that have a lower environmental impact, including the possibility of future regulation by European legislation. Therefore, it is conceivable not to use the anti-aging agent 6PPD in the rubber composition. It was found that the ozone resistance of the rubber composition deteriorated, and the durability of the rubber composition after aging (particularly, the elongation at break (EB) and tensile strength (TB)) significantly deteriorated.
• EB elongation at break
• TB tensile strength
• the present invention solves the above-mentioned problems of the prior art, has excellent ozone resistance, and maintains elongation at break (EB) and tensile strength (TB) after aging without using anti-aging agent 6PPD.
• An object of the present invention is to provide a rubber composition for a tire having a high modulus.
• Another object of the present invention is to provide a tire having excellent ozone resistance and excellent durability after aging.
• the gist and configuration of the present invention for solving the above problems is as follows.
• a rubber component [1] a rubber component; The following general formula (1): [Wherein, R 1 and R 2 are each independently a monovalent saturated hydrocarbon group]; and a quinoline antioxidant, The content of the amine antioxidant is 0.1 to 11 parts by mass with respect to 100 parts by mass of the rubber component, A rubber composition for tires, wherein the content of the quinoline antioxidant is 0.1 to 0.95 parts by mass with respect to 100 parts by mass of the rubber component.
• Such a rubber composition for tires of the present invention is excellent in ozone resistance, and has high retention rate of elongation at break (EB) and tensile strength (TB) after aging.
• the rubber component contains at least one selected from the group consisting of isoprene skeleton rubber, styrene-butadiene rubber, butadiene rubber, and chloroprene rubber.
• the rubber composition has excellent rubber elasticity and is more suitable for tire applications, and the effects of the present invention are more likely to manifest remarkably.
• R 1 and R 2 in the above general formula (1) are each independently a linear or cyclic monovalent saturated hydrocarbon group having 1 to 20 carbon atoms, [1] to [3]
• a tire comprising a rubber member made of the tire rubber composition according to any one of [1] to [5].
• Such a tire of the present invention has excellent ozone resistance and excellent durability after aging.
• the rubber composition for tires which is excellent in ozone resistance and has a high elongation at break (EB) and tensile strength (TB) retention rate after aging can be provided. Moreover, according to the present invention, it is possible to provide a tire having excellent ozone resistance and excellent durability after aging.
• the compounds described herein may be partially or wholly derived from fossil resources, may be derived from biological resources such as plant resources, or may be derived from recycled resources such as used tires. may be It may also be derived from a mixture of any two or more of fossil resources, biological resources, and recycled resources.
• the rubber composition for tires of the present invention comprises a rubber component and the following general formula (1): [In the formula, R 1 and R 2 are each independently a monovalent saturated hydrocarbon group] and an amine anti-aging agent represented by and a quinoline anti-aging agent.
• the content of the amine antioxidant is 0.1 to 11 parts by mass with respect to 100 parts by mass of the rubber component, and the quinoline antioxidant The content is 0.1 to 0.95 parts by mass with respect to 100 parts by mass of the rubber component.
• the amine antioxidant represented by the general formula (1) and the quinoline antioxidant are used in combination, and the content of the amine antioxidant is By setting the content of the quinoline antioxidant to 0.1 parts by mass or more with respect to 100 parts by mass of the rubber component and 0.1 parts by mass or more with respect to 100 parts by mass of the rubber component, the rubber It is possible to sufficiently secure the ozone resistance of the composition and suppress the deterioration of the elongation at break (EB) and tensile strength (TB) of the aged rubber composition. Therefore, the rubber composition for tires of the present invention is excellent in ozone resistance, and has high retention rates of elongation at break (EB) and tensile strength (TB) after aging.
• EB elongation at break
• TB tensile strength
• the content of the amine-based antioxidant is set to 11 parts by mass or less with respect to 100 parts by mass of the rubber component, and the content of the quinoline-based antioxidant is set to the above-mentioned By making it 0.95 parts by mass or less per 100 parts by mass of the rubber component, it is possible to suppress adverse effects on rubber physical properties (heat buildup, etc.) other than ozone resistance, making it suitable for tire applications.
• the amine-based antioxidant represented by the general formula (1) contained in the rubber composition for tires of the present invention has a monovalent saturated hydrocarbon group in which R 1 and R 2 in the general formula (1) , it also has the advantage of being environmentally friendly.
• the rubber composition for tires of the present invention comprises a rubber component, which provides rubber elasticity to the composition.
• a rubber component which provides rubber elasticity to the composition.
• diene rubber is preferable, and isoprene skeleton rubber, styrene-butadiene rubber (SBR), butadiene rubber (BR), and chloroprene rubber (CR) are more preferable.
• the isoprene-skeletal rubber is a rubber having isoprene units as a main skeleton, and specific examples thereof include natural rubber (NR), synthetic isoprene rubber (IR), and the like.
• the rubber component contains at least one selected from the group consisting of isoprene skeleton rubber, styrene-butadiene rubber, butadiene rubber, and chloroprene rubber
• the rubber composition has excellent rubber elasticity and is more suitable for tire applications. becomes.
• the rubber component contains at least one selected from the group consisting of isoprene skeleton rubber, styrene-butadiene rubber, butadiene rubber, and chloroprene rubber
• the effect of the present invention amine anti-aging agent and quinoline anti-aging agent
• the effect of improving ozone resistance and the effect of suppressing the decrease in elongation at break (EB) and tensile strength (TB) after aging due to the combined use of the agent tends to remarkably appear.
• the content of diene rubber such as isoprene skeleton rubber, styrene-butadiene rubber, butadiene rubber and chloroprene rubber in the rubber component is preferably 80% by mass or more, more preferably 90% by mass or more, and may be 100% by mass.
• the rubber component may be used alone or in a blend of two or more.
• the rubber composition for tires of the present invention contains the amine anti-aging agent represented by the general formula (1).
• the amine antioxidant represented by the general formula (1) contains a phenylenediamine moiety like N-phenyl-N'-(1,3-dimethylbutyl)-p-phenylenediamine (antioxidant 6PPD). However, it differs from antiaging agent 6PPD in that it has no double bond other than the phenylenediamine moiety.
• the amine anti-aging agent represented by the general formula (1) improves the ozone resistance of the rubber composition, and reduces the maintenance rate of elongation at break (EB) and tensile strength (TB) after aging. has the effect of suppressing
• R 1 and R 2 are each independently a monovalent saturated hydrocarbon group.
• R 1 and R 2 may be the same or different, but are preferably the same from the viewpoint of synthesis.
• the monovalent saturated hydrocarbon group preferably has 1 to 20 carbon atoms, more preferably 3 to 10 carbon atoms, and particularly preferably 6 and 7 carbon atoms.
• R 1 and R 2 in the general formula (1) each independently represent a linear or cyclic monovalent saturated hydrocarbon having 1 to 20 carbon atoms. It is preferably a group.
• Examples of the monovalent saturated hydrocarbon group include an alkyl group and a cycloalkyl group.
• the alkyl group may be linear or branched, and the cycloalkyl group may further include an alkyl group as a substituent. etc. may be combined.
• alkyl group examples include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, 1,2-dimethylbutyl group, 1,3- dimethylbutyl group, 2,3-dimethylbutyl group, n-pentyl group, isopentyl group, neopentyl group, 1-methylpentyl group, 2-methylpentyl group, 3-methylpentyl group, 4-methylpentyl group, 1,2 -dimethylpentyl group, 1,3-dimethylpentyl group, 1,4-dimethylpentyl group, 2,3-dimethylpentyl group, 2,4-dimethylpentyl group, 3,4-dimethylpentyl group, n-hexyl group, Examples include 1-methylhexyl group, 2-methylhexyl group, various
• 1,4-dimethylpentyl group is preferred.
• the cycloalkyl group include a cyclopentyl group, a methylcyclopentyl group, a cyclohexyl group, a methylcyclohexyl group, a cycloheptyl group, a cyclooctyl group, etc.
• a cyclohexyl group is preferred.
• amine antioxidant represented by the general formula (1) examples include N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine (antiaging agent 77PD), N, N'-bis(1-ethyl-3-methylpentyl)-p-phenylenediamine, N,N'-dicyclohexyl-p-phenylenediamine (antiaging agent CCPD) and the like, among these, N,N' -Bis(1,4-dimethylpentyl)-p-phenylenediamine (antiaging agent 77PD), N,N'-dicyclohexyl-p-phenylenediamine (CCPD) are preferred, N,N'-bis(1,4- Dimethylpentyl)-p-phenylenediamine (antiaging agent 77PD) is particularly preferred.
• the amine anti-aging agents may be used singly or in combination of two or more.
• the content of the amine anti-aging agent is 0.1 to 11 parts by mass with respect to 100 parts by mass of the rubber component. If the content of the amine anti-aging agent is less than 0.1 parts by mass with respect to 100 parts by mass of the rubber component, the ozone resistance of the rubber composition cannot be sufficiently ensured, and the aged rubber The decrease in elongation at break (EB) and tensile strength (TB) of the composition cannot be sufficiently suppressed. On the other hand, when the content of the amine anti-aging agent exceeds 11 parts by mass with respect to 100 parts by mass of the rubber component, adverse effects on rubber physical properties (heat buildup, etc.) other than ozone resistance become greater, resulting in poor tire applications. become unsuitable.
• the content of the amine antioxidant is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, based on 100 parts by mass of the rubber component. 10 parts by mass or less is preferable, and 8 parts by mass or less is more preferable with respect to 100 parts by mass of the rubber component, from the viewpoint of the effect on the rubber.
• the rubber composition for tires of the present invention contains a quinoline antioxidant.
• the quinoline anti-aging agent is an anti-aging agent having a quinoline moiety or a derivative thereof (such as a dihydroquinoline moiety).
• the quinoline anti-aging agent has the effect of improving the ozone resistance of the rubber composition and suppressing the decrease in retention rate of elongation at break (EB) and tensile strength (TB) after aging.
• the quinoline antioxidant preferably has a dihydroquinoline moiety, more preferably a 1,2-dihydroquinoline moiety.
• Specific examples of the quinoline antioxidant include a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline (antioxidant TMDQ), 6-ethoxy-2,2,4-trimethyl-1 ,2-dihydroquinoline, 6-anilino-2,2,4-trimethyl-1,2-dihydroquinoline and the like.
• the quinoline antioxidant preferably contains a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline (antiaging agent TMDQ).
• a quinoline anti-aging agent containing a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline is said to be highly effective in improving the ozone resistance of a rubber composition, and is less likely to discolor the rubber composition. It also has advantages.
• the polymer of 2,2,4-trimethyl-1,2-dihydroquinoline includes dimers, trimers and tetramers of 2,2,4-trimethyl-1,2-dihydroquinoline. mentioned.
• the content of the quinoline antioxidant is 0.1 to 0.95 parts by mass with respect to 100 parts by mass of the rubber component. If the content of the quinoline antioxidant is less than 0.1 parts by mass with respect to 100 parts by mass of the rubber component, the ozone resistance of the rubber composition cannot be sufficiently ensured, and the aged rubber The decrease in elongation at break (EB) and tensile strength (TB) of the composition cannot be sufficiently suppressed. On the other hand, when the content of the quinoline anti-aging agent exceeds 5 parts by mass with respect to 100 parts by mass of the rubber component, the adverse effect on rubber physical properties other than ozone resistance (heat build-up, etc.) increases, resulting in poor tire applications. become unsuitable.
• the content of the quinoline antioxidant is preferably 0.3 parts by mass or more, more preferably 0.5 parts by mass or more, with respect to 100 parts by mass of the rubber component. From the viewpoint of influence on rubber physical properties, it is preferably 4 parts by mass or less, more preferably 3 parts by mass or less per 100 parts by mass of the rubber component.
• the rubber composition for tires of the present invention preferably further contains wax.
• the ozone resistance of the rubber composition is further improved.
• the wax include paraffin wax and microcrystalline wax.
• the content of the wax is preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the rubber component.
• the wax content is 0.1 parts by mass or more with respect to 100 parts by mass of the rubber component, the ozone resistance of the rubber composition is further improved.
• the wax content is 5 parts by mass or less with respect to 100 parts by mass of the rubber component, the effect on rubber physical properties other than ozone resistance is small.
• the content of the wax is more preferably 0.5 parts by mass or more, and even more preferably 1 part by mass or more, with respect to 100 parts by mass of the rubber component. From the viewpoint of influence, it is more preferably 4 parts by mass or less, and even more preferably 3 parts by mass or less with respect to 100 parts by mass of the rubber component.
• the tire rubber composition of the present invention preferably contains sulfur.
• sulfur When the rubber composition contains sulfur, it becomes vulcanizable, and the durability (in particular, elongation at break (EB) and tensile strength (TB)) of the rubber composition is improved.
• sulfur various types of sulfur can be used, but ordinary sulfur (soluble sulfur (powder sulfur), etc.) is preferable to insoluble sulfur, and oil treated sulfur, etc. are also preferable.
• insoluble sulfur is sulfur insoluble in carbon disulfide (amorphous polymeric sulfur), and soluble sulfur (powder sulfur) is sulfur soluble in carbon disulfide.
• the sulfur content is preferably in the range of 0.1 to 10 parts by mass, more preferably in the range of 1 to 5 parts by mass, per 100 parts by mass of the rubber component. If the sulfur content is 0.1 parts by mass or more per 100 parts by mass of the rubber component, the durability of the vulcanized rubber can be ensured, and if it is 10 parts by mass or less per 100 parts by mass of the rubber component , sufficient rubber elasticity can be ensured.
• the rubber composition for tires of the present invention is commonly used in the rubber industry, if necessary, in addition to the rubber component, amine-based antioxidant, quinoline-based antioxidant, wax, and sulfur described above.
• Various components such as fillers (silica, carbon black, calcium carbonate, etc.), silane coupling agents, softening agents, processing aids, resins, surfactants, organic acids (stearic acid, etc.), zinc oxide (zinc oxide) .
• Commercially available products can be suitably used as these compounding agents.
• the amine anti-aging agent represented by the general formula (1) may be supported on any carrier.
• the amine anti-aging agent represented by the above general formula (1) may be supported on inorganic fillers such as silica and calcium carbonate.
• the amine anti-aging agent represented by the general formula (1) may form a masterbatch together with the rubber component.
• the rubber component used in forming the masterbatch is not particularly limited, and may be diene rubber such as natural rubber (NR), ethylene-propylene-diene rubber (EPDM), or the like.
• the amine anti-aging agent represented by the general formula (1) may be a salt with an organic acid.
• the organic acid used for forming the salt is not particularly limited, but stearic acid and the like can be mentioned.
• the method for producing the rubber composition is not particularly limited, but for example, the above-described rubber component, amine-based antioxidant and quinoline-based antioxidant are blended with various components appropriately selected as necessary. Then, it can be produced by kneading, heating, 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.
• a tire of the present invention is characterized by comprising a rubber member made of the rubber composition for a tire described above. Since the tire of the present invention includes a rubber member made of the rubber composition for tires, it has excellent ozone resistance and excellent durability after aging. The tire of the invention also has the advantage of being environmentally friendly. Suitable examples of rubber members to which the tire rubber composition is applied include side rubbers, tread rubbers, inner liners, and the like, which constitute the tire surface. The rubber member to which the above rubber composition for tires is applied may be a rubber member that constitutes the inside of a tire. is mentioned.
• the tire of the present invention may be obtained by vulcanizing after molding using an unvulcanized rubber composition, or using a semi-vulcanized rubber that has undergone a pre-vulcanization step or the like. After molding, it may be obtained by further vulcanization.
• the tire of the present invention 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 an inert gas such as nitrogen, argon, or helium. can be used.
• Example 3> (Preparation of rubber composition) A rubber composition was produced according to the formulation shown in Table 1. Table 2 shows the amounts of anti-aging agents used.
• SBR Styrene-butadiene rubber
• Silica Manufactured by Tosoh Silica Industry Co., Ltd., trade name “Nip Seal AQ” *4 Carbon black: Asahi Carbon Co., Ltd., trade name “Asahi #78” *5 Wax: Microcrystalline wax, total amount of "Ozoace 0701" manufactured by Nippon Seiro Co., Ltd.
• Anti-aging agent 77PD General formula (1) Amine anti-aging agent, N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine, EASTMAN, wherein R 1 and R 2 are saturated hydrocarbon groups (1,4-dimethylpentyl groups) manufactured by Santoflex, trade name “Santoflex 77PD” * 7 anti-aging agent TMDQ: quinoline anti-aging agent, 2,2,4-trimethyl-1,2-dihydroquinoline polymer * 8 anti-aging agent 6PPD: N-phenyl-N'-(1,3-dimethylbutyl )-p-phenylenediamine, manufactured by Sumitomo Chemical Co., Ltd., trade name “Antigen 6C” *9 Sulfur: Hosoi Chemical Co., Ltd., trade name “HK200-5”, 5% oil *10 Other chemicals: Silane coupling agent (bis (trie
• Rubber compositions are produced according to the formulations shown in Tables 1 and 2, and evaluated for retention of elongation at break (EB) and tensile strength (TB) after aging and ozone resistance by the above methods.
• the content of the amine-based antioxidant represented by the general formula (1) is 0.1 to 11 parts by mass with respect to 100 parts by mass of the rubber component, and the content of the quinoline-based antioxidant is In the examples in which the amount is 0.1 to 0.95 parts by mass with respect to 100 parts by mass of the rubber component, even without using the anti-aging agent 6PPD, the ozone resistance is excellent, and the elongation at break (EB) after aging and It can be seen that the retention rate of tensile strength (TB) is high. In addition, from Comparative Example 3, it can be seen that when the content of the quinoline anti-aging agent exceeds 0.95 parts by mass with respect to 100 parts by mass of the rubber component, the heat build-up deteriorates.

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• 2022
  • 2022-08-05 WO PCT/JP2022/030187 patent/WO2023013779A1/ja not_active Ceased
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