WO2023228464A1 - Pneu - Google Patents

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Publication number
WO2023228464A1
WO2023228464A1 PCT/JP2023/000859 JP2023000859W WO2023228464A1 WO 2023228464 A1 WO2023228464 A1 WO 2023228464A1 JP 2023000859 W JP2023000859 W JP 2023000859W WO 2023228464 A1 WO2023228464 A1 WO 2023228464A1
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WIPO (PCT)
Prior art keywords
metal
belt
cord
tire
monofilament
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PCT/JP2023/000859
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English (en)
Japanese (ja)
Inventor
恭平 松本
倩 呉
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株式会社ブリヂストン
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Publication of WO2023228464A1 publication Critical patent/WO2023228464A1/fr

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    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre

Definitions

  • the present invention relates to tires.
  • a carcass containing reinforcing cords buried along the meridian direction of a ring-shaped tire body is placed inside the tire where strength is required, and a belt is placed on the outside of the carcass in the tire radial direction. layers are arranged.
  • the belt layer is usually formed using a metal cord-elastomer composite obtained by coating a metal cord such as a steel cord with an elastomer, and provides the tire with load resistance, traction resistance, etc.
  • Patent Document 1 discloses a steel cord for reinforcing a tire in which a thermoplastic elastomer composition in which an elastomer is dispersed in a thermoplastic resin is coated around a steel cord body made of a single monofilament, and a steel cord using the same. Tires are disclosed.
  • Patent Document 2 discloses that two to six main filaments of the same diameter are arranged in parallel to form a single layer without being twisted to form a main filament bundle, and one A pneumatic radial tire is disclosed in which a steel cord formed by wrapping a main steel filament as a wrapping filament around a main filament bundle is used as a belt layer of the tire.
  • an object of the present invention is to solve the problems of the above-mentioned prior art and provide a tire that is lightweight, maintains plunger durability, and has improved handling stability.
  • the gist of the tire of the present invention that solves the above problems is as follows.
  • a tire comprising a belt consisting of at least two belt layers disposed in the tread portion, and a belt reinforcing layer disposed on the outside of the belt in the tire radial direction,
  • the belt layer and the belt reinforcing layer are formed by covering a reinforcing material with an elastomer
  • the reinforcing material of the belt layer is a metal monofilament with a filament diameter d of less than 0.30 mm
  • the reinforcing material of the belt reinforcing layer is an organic fiber cord having a cutting strength of 6.5 cN/dtex or more, a cutting elongation of 10% or more, and an elastic modulus at 7% elongation of 6.0 mN/(dtex ⁇ %) or more.
  • a tire characterized by:
  • the ratio G/w 2 of the distance G between the surfaces of the metal monofilaments embedded in two adjacent belt layers in the belt and the distance w 2 between the metal cords is 1.6.
  • the ratio w 1 /W of the interval w 1 between adjacent metal monofilaments constituting the metal cord and the width W of the metal cord is 0.07 or more, [3] to [5], wherein the ratio d/w 1 of the filament diameter d of the metal monofilament to the distance w 1 between adjacent metal monofilaments constituting the metal cord is 1.2 or more and less than 2.
  • the belt includes a first belt layer and a second belt layer laminated on the outside of the first belt layer in the tire radial direction,
  • the shortest distance b is the following formula (2): 1.8 ⁇ b/a ⁇ 4.0...
  • a is the shortest distance between the metal monofilament of the second belt layer and the metal monofilament of the first belt layer in the tire center part
  • b is the shortest distance between the metal monofilament of the end of the second belt layer and the first belt
  • FIG. 1 is a sectional view of one embodiment of a tire of the present invention.
  • FIG. 3 is a diagram showing a load-elongation curve of a cord.
  • FIG. 1 is a partial cross-sectional view in the width direction of a belt layer according to an embodiment of the tire of the present invention.
  • FIG. 1 is a schematic plan view of metal cords of a belt layer according to an embodiment of a tire of the present invention.
  • FIG. 2 is an explanatory diagram relating to the definition of the ratio of the cross-sectional area of a metal monofilament included in the cross-section of a metal cord.
  • FIG. 1 is an enlarged partial cross-sectional view of a belt according to an embodiment of the tire of the present invention.
  • FIG. 3 is a schematic plan view of metal cords of a belt layer according to another embodiment of the tire of the present invention.
  • FIG. 3 is a schematic cross-sectional view in the width direction of a metal cord of a belt layer according to another embodiment of the tire of the present invention.
  • FIG. 2 is an explanatory diagram of a metal monofilament showing definitions of a molding amount and a molding pitch of the metal monofilament.
  • FIG. 3 is a schematic cross-sectional view in the width direction of a metal cord of a belt layer according to another embodiment of the tire of the present invention.
  • FIG. 3 is a schematic plan view of metal cords of a belt layer according to another embodiment of the tire of the present invention.
  • FIG. 3 is a schematic cross-sectional view in the width direction of a metal cord of a belt layer according to another embodiment of the tire of the present invention.
  • FIG. 2 is an explanatory diagram of a metal monofilament showing definitions of a molding amount and a molding pitch of the metal monofilament.
  • FIG. 3 is a schematic cross-sectional view in the width direction of a metal cord of a belt layer according to another embodiment of the tire of the present invention.
  • FIG. 3 is a schematic cross-sectional view in the width direction of a metal cord of a belt layer according to another embodiment of the tire of the present invention.
  • FIG. 3 is a schematic plan view of metal cords of a belt layer according to another embodiment of the tire of the present invention.
  • FIG. 3 is a schematic cross-sectional view in the width direction of a metal cord of a belt layer according to another embodiment of the tire of the present invention. It is a schematic sectional view of the end part of the belt concerning other embodiments of the tire of the present invention. It is a schematic sectional view of the center part of the belt concerning other embodiments of the tire of the present invention.
  • the tire of this embodiment includes a belt consisting of at least two belt layers disposed in the tread portion, and a belt reinforcing layer disposed on the outside of the belt in the tire radial direction.
  • the belt layer and the belt reinforcing layer are formed by covering a reinforcing material with an elastomer, and the reinforcing material of the belt layer is a metal monofilament with a filament diameter d of less than 0.30 mm.
  • the reinforcing material of the belt reinforcing layer is an organic fiber having a cutting strength of 6.5 cN/dtex or more, a cutting elongation of 10% or more, and an elastic modulus at 7% elongation of 6.0 mN/(dtex ⁇ %) or more. It is characterized by being a code.
  • the tire of this embodiment includes a belt layer formed by covering a metal monofilament with a filament diameter d of less than 0.30 mm with an elastomer, and since the belt layer is thin, it is lightweight.
  • the in-plane rigidity of the belt layer will be lower than that of a normal belt layer, resulting in a decrease in plunger durability (durability against protrusion input).
  • the tire of this embodiment has a cutting strength of 6.5 cN/dtex or more, a cutting elongation of 10% or more, and an elastic modulus at 7% elongation of 6.0 mN.
  • the tire of this embodiment maintains plunger durability, is lightweight, and has improved steering stability.
  • FIG. 1 is a cross-sectional view of one embodiment of the tire of the present invention.
  • the tire 100 shown in FIG. 1 includes a pair of bead portions 10, a pair of sidewall portions 20, a tread portion 30, and a carcass 50 extending in a toroidal shape between bead cores 40 embedded in the bead portions 10.
  • a belt 60 consisting of two belt layers 60A and 60B disposed on the tread portion 30 (more specifically, disposed on the outside in the tire radial direction of the crown portion of the carcass 50), and a belt 60 on the outside of the belt 60 in the tire radial direction.
  • the carcass 50 is composed of one carcass ply, and includes a main body portion extending in a toroidal shape between a pair of bead cores 40 respectively embedded in the bead portion 10, and It consists of a folded part that is wound radially outward from the inside to the outside in the tire width direction around the bead core 40, but in the tire of the present invention, the number of plies and structure of the carcass 50 are not limited to this. do not have.
  • the carcass ply constituting the carcass 50 is preferably formed by covering a plurality of reinforcing cords with an elastomer, which extend in a direction substantially perpendicular to the tire circumferential direction (for example, extend at an angle of 70 to 90 degrees). That is, the carcass 50 is preferably a radial carcass.
  • a steel cord may be used in addition to an organic fiber cord such as a polyethylene terephthalate cord, a nylon cord, or a rayon cord.
  • the belt is made of a metal monofilament (reinforcement material) coated with an elastomer, preferably a steel monofilament coated with an elastomer, and further includes two belt layers 60A and 60B.
  • the metal monofilaments constituting the layers 60A and 60B are laminated to intersect with each other with the tire equatorial plane interposed therebetween, thereby constituting the belt 60.
  • the belt 60 in the figure is composed of two belt layers 60A and 60B (hereinafter, the belt layer 60A may be referred to as a "first belt layer” and the belt layer 60B as a "second belt layer".
  • the number of belt layers constituting the belt may be two or more and is not limited to this. Since the metal monofilament serving as the reinforcing material for the belt layers 60A and 60B has a filament diameter d of less than 0.30 mm, the thickness of the belt layers 60A and 60B can be reduced, contributing to weight reduction of the tire.
  • the filament diameter d of the metal monofilament as a reinforcing material for the belt layer is preferably 0.15 mm or more, and preferably 0.28 mm or less. When the filament diameter d of the metal monofilament is 0.15 mm or more, the plunger durability and steering stability of the tire are further improved, and when it is 0.28 mm or less, the tire becomes even lighter.
  • the metal monofilament (also referred to as "single wire”) only needs to satisfy the filament diameter d described above, and its specific structure is not particularly limited.
  • a straight metal monofilament, a metal monofilament twisted around the axis, a metal monofilament with a flat cross section, a metal monofilament shaped into a spiral shape, a metal monofilament shaped into a plane wave shape, etc. are used. be able to.
  • the belt reinforcing layers 70A and 70B include organic fiber cords (reinforcing material) arranged substantially parallel to the tire circumferential direction (for example, at an angle of 0 to 5 degrees with respect to the tire circumferential direction). ) is coated with an elastomer.
  • the belt reinforcing layers 70A and 70B are formed by continuously winding a narrow strip prepared by covering an organic fiber cord with an elastomer in a spiral shape in the tire circumferential direction. In this case, since there is no joint in the circumferential direction of the tire, the uniformity of the tire is good, and since there is no joint, concentration of strain on the joint can be prevented.
  • each of the belt reinforcing layers 70A and 70B is one layer, but may be two or more layers.
  • the organic fiber cord that is the reinforcing material for the belt reinforcing layers 70A and 70B has a cutting strength of 6.5 cN/dtex or more, a cutting elongation of 10% or more, and an elastic modulus at 7% elongation of 6.0 mN/(dtex. %), the rigidity is high and the effect of reinforcing the belt 60 (belt layers 60A, 60B) is high, contributing to improving the plunger durability and steering stability of the tire.
  • the elastomer that covers the reinforcing material is not particularly limited, and various elastomers can be used.
  • the elastomer preferably has a 50% modulus value of 1.5 MPa or more, more preferably 1.8 MPa or more, even more preferably 2.0 MPa or more, as measured in accordance with JIS K 6251 (2010). be.
  • the main components of the elastomer include natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene-butadiene rubber (SBR), butadiene rubber (BR, high cis BR and low cis BR), nitrile rubber ( NBR), hydrogenated NBR, hydrogenated SBR and other diene rubbers and their hydrogenated products, ethylene-propylene rubber (EPDM, EPM), maleic acid-modified ethylene-propylene rubber (M-EPM), butyl rubber (IIR), isobutylene and aromatic vinyl or diene monomer copolymers, acrylic rubber (ACM), olefin rubbers such as ionomers, Br-IIR, Cl-IIR, brominated isobutylene-paramethylstyrene copolymers (Br-IPMS), Halogen-containing rubbers such as chloroprene rubber (CR), hydrin rubber (CHR), chlorosulfonated polyethylene
  • the elastomer may contain an anti-aging agent, zinc oxide (zinc white), stearic acid, etc., which are commonly used in rubber products such as tires. can.
  • an anti-aging agent zinc oxide (zinc white), stearic acid, etc., which are commonly used in rubber products such as tires. can.
  • the organic fiber cord applied to the belt reinforcing layers 70A and 70B has a cutting strength of 6.5 cN/dtex or more, a cutting elongation of 10% or more, and an elastic modulus at 7% elongation of 6.0 mN/(dtex ⁇ %). ) That's it.
  • the cutting strength, cutting elongation, and elastic modulus at 7% elongation of the organic fiber cord are values measured at room temperature (23° C.). Further, various physical properties of the organic fiber cord can be measured according to JIS L 1013 "Chemical fiber filament yarn testing method".
  • the elastic modulus at 7% elongation is calculated by converting the slope (N/%) of the tangent at the point corresponding to 7% elongation of the load-elongation curve of the cord into a value per 1 dtex.
  • the slope of the tangent at the point corresponding to 7% elongation on the load-elongation curve means the slope of the tangent S at the point corresponding to 7% elongation on the load-elongation curve C of the cord as shown in FIG.
  • Organic fiber cords with a cutting strength of 6.5 cN/dtex or more, a cutting elongation of 10% or more, and an elastic modulus at 7% elongation of 6.0 mN/(dtex %) or more have high strength when cut, Since the elongation when cut is large and the elastic modulus at 7% elongation is high, organic fiber cords with such physical properties are applied to the belt reinforcement layer to supplement the rigidity of the belt layer, making it possible to apply belt layers containing metal monofilaments. It is possible to improve the steering stability of the tire while suppressing a decrease in plunger durability due to
  • the material of the organic fiber cord is not particularly limited, but includes polyester such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), nylon such as 6-nylon, 6,6-nylon, and 4,6-nylon, and rayon. , Lyocell, and other celluloses.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • nylon such as 6-nylon, 6,6-nylon, and 4,6-nylon
  • rayon Lyocell, and other celluloses.
  • polyethylene terephthalate is preferred; that is, the organic fiber cord as a reinforcing material for the belt reinforcing layers 70A and 70B is a cord made of polyethylene terephthalate (hereinafter sometimes simply referred to as "polyethylene terephthalate cord”). It is preferable.
  • Polyethylene terephthalate cord has higher rigidity than commonly used nylon cord and the like, and is excellent in improving tire plunger durability and steering stability.
  • the organic fiber cord has an elastic modulus of 2.5 mN/(dtex ⁇ %) or more under a load of 29.4 N measured at 160°C.
  • the elastic modulus at a load of 29.4N measured at 160°C is calculated by dividing the slope (N/%) of the tangent at the point corresponding to the load of 29.4N on the load-elongation curve of the cord measured at 160°C by 1 dtex. It is calculated by converting it into a hit value.
  • the reason why the elastic modulus is measured at 160°C is because the temperature inside the tire increases as the tire travels at high speeds, and by the time tire failure occurs during high-speed driving, the temperature of the belt reinforcing layer has reached 160°C. .
  • the elastic modulus of polyethylene terephthalate cords decreases significantly at high temperatures compared to normal temperatures, and even if the cord is highly elastic at room temperature, if it cannot maintain a high elastic modulus at high temperatures, it will not have sufficient belt reinforcing effect. Therefore, the elastic modulus at high temperatures is of important significance.
  • the elastic modulus of the cord By setting the elastic modulus of the cord at 29.4N load measured at 160°C to 2.5mN/(dtex ⁇ %) or more, the plunger durability of the tire can be improved, and it can also improve the elasticity during high-speed driving.
  • the amount of protrusion of the belt can be suppressed, reducing stress when the tire is pressed in and out, improving the steering stability of the tire when driving at high speeds.
  • the present inventors adjusted the tension applied to the cord during dipping treatment, produced organic fiber cords with various elastic moduli, covered the obtained dipped cord with an elastomer, applied it to a belt reinforcing layer, and applied it to a tire tire.
  • the plunger durability of the tire was determined when the elastic modulus of the cord at a load of 29.4N measured at 160°C was 2.5mN/(dtex ⁇ %) or more. It was also found that the improvement in handling stability was significant.
  • the tension at the time of adhesive treatment be 6.9 ⁇ 10 ⁇ 2 N/tex or more.
  • the adhesive treatment includes dry treatment, hot treatment, normalization treatment, etc., and is performed by appropriately adjusting temperature and time in addition to tension.
  • the adhesive treatment may be performed in either one-bath treatment or two-bath treatment, but it is preferable to perform adhesive treatment in two - bath treatment. It is preferable to apply it to the cord during hot processing.
  • the organic fiber cord has a total fineness of 1000 to 3500 dtex.
  • the total fineness of the cord is 1000 dtex or more, sufficient elastic modulus can be exhibited to improve durability against protrusion input and suppress belt protrusion, and when it is 3500 dtex or less, dense driving is possible. , sufficient rigidity per unit width can be ensured.
  • the elongation rate of the organic fiber cord in the tire after vulcanization is 2% or less relative to the original length of the cord before vulcanization.
  • the raw material for the organic fiber cord is not particularly limited, and may be derived from synthetic products, biological origin, mechanically recycled material obtained by crushing, melting, and respinning PET products such as PET bottles, or PET products such as PET bottles, etc. It may also be derived from chemical recycling by depolymerizing and repolymerizing PET products such as bottles.
  • the form of the organic fiber cord is not particularly limited, and may be a single-twist structure or a twisted structure (double-twist structure, etc.).
  • a twisted yarn cord can be obtained by aligning the raw yarns and twisting them in one direction.
  • a twisted yarn cord can be obtained by first twisting the raw yarn, then combining a plurality of these yarns and applying final twisting in the opposite direction.
  • the organic fiber cord may contain an adhesive composition containing a thermoplastic polymer (A), a heat-reactive water-based urethane resin (B), and an epoxy compound (C), or these (A) -
  • An adhesive composition comprising rubber latex (D) in addition to (C), wherein the main chain of the thermoplastic polymer (A) substantially has an addition-reactive carbon-carbon double bond.
  • adhesive treatment it is preferable to perform adhesive treatment with an adhesive composition characterized by having at least one functional group having crosslinking properties as a pendant group.
  • RFL resin a resin made by mixing resorcinol, formaldehyde, and latex is applied onto the cord surface.
  • RFL resin a resin made by mixing resorcinol, formaldehyde, and latex is applied onto the cord surface.
  • two-bath treatment is being carried out.
  • the resin used in the first bath becomes very hard, which increases the strain input to the cord and reduces the fatigue resistance of the cord.
  • such resins can exhibit sufficient adhesion between the cord and the elastomer at room temperature, but the adhesion may be extremely reduced at high temperatures of 130° C. or higher.
  • thermoplastic polymer (A) which has at least one functional group having crosslinking properties as a pendant group and which does not substantially contain addition-reactive carbon-carbon double bonds in its main chain structure and
  • a one-bath mixed solution containing a reactive water-based urethane resin (B) and an epoxy compound (C) the cord can be sufficiently bonded to the elastomer (covering rubber) even at high temperatures of 180°C or higher without curing the cord. can be secured.
  • the main chain of the thermoplastic polymer (A) mainly has a linear structure, and examples of the main chain include ethylene polymers such as acrylic polymers, vinyl acetate polymers, and vinyl acetate/ethylene polymers. Polymers with added properties or urethane-based polymers are preferred. However, the thermoplastic polymer (A) only needs to have the function of suppressing the resin fluidity at high temperatures and ensuring the breaking strength of the resin by crosslinking the functional groups of the pendant groups. It is not limited to ethylenic addition polymers and urethane-based polymers.
  • an oxozaline group a bismaleimide group, a (blocked) isocyanate group, an aziridine group, a carbodiimide group, a hydrazino group, an epoxy group, an epithio group, etc. are preferable.
  • Examples of the monomer constituting the ethylenic addition polymer include an ethylenically unsaturated monomer having one carbon-carbon double bond, and a monomer containing two or more carbon-carbon double bonds. It will be done.
  • ⁇ -olefins such as ethylene, propylene, butylene, and isobutylene
  • ethylenic carboxylic acids and their salts such as itaconic acid, fumaric acid, maleic acid, acrylic acid, methacrylic acid, and butenetricarboxylic acid
  • Acid anhydrides such as maleic anhydride and itaconic anhydride
  • Examples include oxazolines; heterocyclic vinyl compounds such as vinylpyrrolidone; unsaturated bond-containing silane compounds such as vinylethoxysilane and ⁇ -methacryloxypropyltrimethoxysilane; these may be used alone or in combination of two or more. May be used together. In the present invention, it is preferable to obtain the polymer (A) by radical addition polymerization of these monomers.
  • monomers constituting the main chain skeleton containing two or more carbon-carbon double bonds include 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-butadiene, - Conjugated diene monomers such as halogen-substituted butadiene such as dimethyl-1,3-butadiene and chloroprene, and non-conjugated diene monomers include vinylnorbornene, dicyclopentadiene, 1,4 Examples include non-conjugated diene monomers such as -hexadiene, which may be used alone or in combination of two or more.
  • the ethylenic addition polymer is composed of units derived from an ethylenically unsaturated monomer having one carbon-carbon double bond and a monomer containing two or more carbon-carbon double bonds, and the total monomer
  • the monomer composition ratio of sulfur-reactive carbon-carbon double bonds is preferably 10 mol% or less, more preferably 0 mol%, based on the amount charged.
  • the method of introducing a crosslinkable functional group into the ethylenic addition polymer to form the thermoplastic polymer (A) is not particularly limited.
  • addition polymerizable monomers having oxazoline addition polymerizable monomers having epoxy groups, addition polymerizable monomers having maleimide, addition polymerizable monomers having blocked isocyanate groups, and addition polymerizable monomers having epithio groups.
  • a method of copolymerizing an addition polymerizable monomer or the like when polymerizing the ethylenic addition polymer can be adopted.
  • the urethane-based high molecular weight polymers mainly contain urethane bonds obtained by polyaddition reaction of polyisocyanate and a compound having two or more active hydrogens, or urea bonds between isocyanate groups and active hydrogens. It is a high-molecular polymer that has many bonds within its molecules due to reactions. In addition, not only bonds resulting from the reaction between isocyanate groups and active hydrogen, but also ester bonds, ether bonds, amide bonds contained within active hydrogen compound molecules, and uretdione, carbodiimide, etc. generated by reactions between isocyanate groups. It may also be a polymer containing
  • the heat-reactive aqueous urethane resin (B) is preferably a resin having two or more thermally dissociable blocked isocyanate groups in one molecule.
  • the following general formula (4) [In the formula, A represents an isocyanate residue of an organic polyisocyanate compound having 3 to 5 functional groups, Y represents an active hydrogen residue of a blocking agent compound that releases isocyanate groups by heat treatment, and Z represents at least 1 X is an active hydrogen residue of a compound having 2 to 4 active hydrogen atoms and at least one anion-forming group, and X is an active hydrogen residue of a polyol compound having 2 to 4 hydroxyl groups and an average molecular weight of 5000 or less. , n is an integer of 2 to 4, and p+m is an integer of 2 to 4 (m ⁇ 0.25)] is particularly preferred.
  • the epoxy compound (C) may be any compound containing two or more, preferably four or more, epoxy groups in one molecule, and may be a reaction between a compound containing an epoxy group, a polyhydric alcohol, and epichlorohydrin. Products are preferred.
  • Specific examples of epoxy compounds include diethylene glycol diglycidyl ether, polyethylene diglycidyl ether, polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and glycerol polyglycidyl ether.
  • polyhydric alcohols such as ether, trimethylolpropane polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, and sorbitol polyglycidyl ether with epichlorohydrin.
  • novolac type epoxy resins such as phenol novolak type epoxy resins and cresol novolac type epoxy resins
  • bisphenol A type epoxy resins and the like are examples of polyhydric alcohols such as ether, trimethylolpropane polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, and sorbitol polyglycidyl ether with epichlorohydrin.
  • novolac type epoxy resins such as phenol novolak type epoxy resins and cresol
  • the rubber latex (D) is preferably vinylpyridine-styrene-butadiene copolymer latex, styrene-butadiene copolymer latex, etc., but is not particularly limited.
  • the organic fiber cord (especially polyethylene terephthalate cord) can be prepared by using the three types (A), (B), and (C) as the one-bath treatment liquid, and using the normal RFL liquid as the two-bath treatment liquid. is preferred. It is also possible to process the mixture of (A), (B), (C), and (D) in only one bath. In addition, the dry weight ratio of each of these components is (A) 2 to 75% of the dry weight of the adhesive composition, (B) 15 to 87%, (C) 11 to 70%, and (D) 20%. % or less.
  • the belt reinforcing layer is preferably formed by treating the organic fiber cord with an adhesive, coating it with an elastomer to form a narrow strip, and then continuously winding the strip in a spiral shape in the tire circumferential direction.
  • FIG. 3 is a partial cross-sectional view in the width direction of a belt layer according to an embodiment of the tire of the present invention
  • FIG. 4 is a schematic plan view of a metal cord of the belt layer according to an embodiment of the tire of the present invention. be.
  • the belt layer 60A (60B) shown in FIG. 3 is a metal cord 2 made of a bundle of a plurality of metal monofilaments 1 that are not twisted together but are aligned in a line, and is coated with an elastomer 3.
  • the thickness of the belt layer 60A (60B) can be reduced by covering the metal cord 2, which is a bundle of a plurality of metal monofilaments 1 in a line without twisting them together, with an elastomer 3 and applying it to the belt layer 60A (60B). It becomes thinner, making the tire even lighter.
  • the number of metal monofilaments 1 is preferably 2 or more, more preferably 5 or more, and preferably 20 or less, more preferably 12 or less, still more preferably 10 or less, particularly preferably 9 or less.
  • the metal cord 2 is made up of a bundle of .
  • the belt layer 60A (60B) shown in FIG. 3 five metal monofilaments 1 are aligned without being twisted together to form a metal cord 2. With such a configuration, the thickness of the belt layer 60A (60B) can be reduced, and the weight of the tire can be reduced.
  • the distance w 1 between adjacent metal monofilaments 1 constituting the metal cord 2 is preferably 0.01 mm or more and less than 0.24 mm. In this way, by providing the gap w1 in the above range between adjacent metal monofilaments 1, it becomes possible to sufficiently penetrate the elastomer 3, and as a result, the metal cord 2 can be deformed out of plane when compressed. It can suppress the bending of metal cords. Further, by setting the interval w 1 between the metal monofilaments 1 to be less than 0.24 m, separation between the metal monofilaments 1 in the metal cord 2 can be suppressed.
  • the distance w 1 between the metal monofilaments 1 is set to 0.01 mm or more, the elastomer 3 sufficiently penetrates between the metal monofilaments 1 in the metal cord 2 .
  • the distance w 1 between the metal monofilaments 1 is more preferably 0.03 mm or more and 0.20 mm or less, even more preferably 0.03 mm or more and 0.18 mm or less.
  • the elastomer In the bundle of metal monofilaments 1, it is difficult for the elastomer to penetrate between closely adjacent monofilaments, resulting in a non-elastomer-covered area that is not covered by the elastomer, and in the non-elastomer-covered area, the metal monofilaments are mutually displaced when the tire rolls. As a result, the in-plane rigidity of the belt may decrease. However, in the belt layer 60A (60B) shown in FIG. 3, since the elastomer 3 sufficiently penetrates between the adjacent metal monofilaments 1, non-elastomer-covered regions are unlikely to occur, and the in-plane rigidity of the belt is sufficiently improved. , the plunger durability and steering stability of the tire can be further improved.
  • the elastomer coverage of the adjacent metal monofilaments 1 on the side surfaces in the width direction of the metal cord 2 is 10% or more per unit length, It is more preferably 20% or more, still more preferably 50% or more, even more preferably 80% or more, and particularly preferably 90% or more.
  • the distance w2 between the metal cords 2 measured in the direction perpendicular to the extending direction of the metal cords 2 is 0.25 mm or more and 2.0 mm or less. preferable.
  • the interval w 2 between the metal cords 2 By setting the interval w 2 between the metal cords 2 to be 0.25 mm or more, it is possible to suppress belt edge separation in which elastomer peeling starting from the cord ends at the ends in the belt width direction propagates between adjacent metal cords. .
  • the interval w2 between the metal cords 2 is more preferably 0.3 mm or more and 1.8 mm or less, and still more preferably 0.35 mm or more and 1.5 mm or less.
  • the thickness t of the belt layer 60A (60B) is preferably 0.8 mm or less, and preferably more than 0.30 mm.
  • the thickness t of the belt layer 60A (60B) is preferably 0.8 mm or less, and preferably more than 0.30 mm.
  • the metal monofilament 1 is preferably steel, that is, a linear metal whose main component is iron (the mass of iron with respect to the total mass of the metal monofilament exceeds 50% by mass), It may be composed only of iron, or it may contain metals other than iron, such as zinc, copper, aluminum, and tin.
  • the surface state of the metal monofilament 1 is not particularly limited, but may take the following form, for example. That is, as for the metal monofilament 1, it is preferable that the N atoms on the surface be 2 atomic % or more and 60 atomic % or less, and the Cu/Zn ratio on the surface be 1 or more and 4 or less.
  • the amount of phosphorus contained as an oxide in the outermost layer of the metal monofilament up to 5 nm inward in the radial direction of the metal monofilament from the surface of the metal monofilament is 7.0 as a proportion of the total amount excluding the amount of C. It is preferably at most atomic %.
  • the surface of the metal monofilament 1 may be plated.
  • the type of plating is not particularly limited, and examples include zinc (Zn) plating, copper (Cu) plating, tin (Sn) plating, brass (copper-zinc (Cu-Zn)) plating, and bronze (copper-tin (Cu-Zn)) plating.
  • zinc (Zn) plating copper-Cu) plating
  • tin (Sn) plating copper (copper-zinc (Cu-Zn)) plating
  • bronze copper-tin (Cu-Zn)) plating.
  • ternary plating such as copper-zinc-tin (Cu-Zn-Sn) plating and copper-zinc-cobalt (Cu-Zn-Co) plating can be mentioned.
  • brass plating and copper-zinc-cobalt plating are preferred.
  • the brass-plated metal monofilament has excellent adhesion to the elastomer (coated rubber).
  • the ratio of copper to zinc (copper:zinc) is usually 60 to 70:30 to 40 on a mass basis, and in copper-zinc-cobalt plating, the ratio of copper to zinc is usually 60 to 75% by mass, Cobalt is 0.5-10% by weight.
  • the thickness of the plating layer is preferably 100 nm or more and 300 nm or less.
  • the metal monofilament 1 there are no particular limitations on the tensile strength or cross-sectional shape of the metal monofilament 1.
  • the metal monofilament 1 one having a tensile strength of 2500 MPa (250 kg/mm 2 ) or more can be used.
  • the cross-sectional shape of the metal monofilament 1 in the width direction is not particularly limited, and may be circular, elliptical, rectangular, triangular, polygonal, or the like.
  • the metal monofilament 1 is a substantially straight metal monofilament, as shown in FIG.
  • a straight metal monofilament refers to a metal monofilament that is not intentionally shaped and is substantially unshaped.
  • wrapping filaments spiral filaments
  • the belt layer 60A (60B) can be manufactured by a known method.
  • a steel cord can be manufactured by lining up a bundle of metal monofilaments in parallel at a predetermined interval and covering them with an elastomer (coating rubber). The sample can then be manufactured by vulcanization under standard conditions. Further, the metal monofilament can also be molded using a conventional molding machine and according to a conventional method.
  • the filament diameter d (mm) of the metal monofilament 1, the distance w 1 (mm) between adjacent metal monofilaments 1 constituting the metal cord 2, and the number n (mm) of the metal monofilaments 1 constituting the metal cord 2. ) means the following formula (1): 0.45 ⁇ [(d/2) 2 ⁇ n]/ ⁇ d ⁇ [d ⁇ n+w 1 ⁇ (n-1)] ⁇ 0.77 (1) It is preferable that the following relationship is satisfied.
  • d is the filament diameter (mm) of the metal monofilament 1
  • w1 is the distance between adjacent metal monofilaments 1 (" (also referred to as “distance between surfaces” or “gap amount") (mm)
  • n is the number (pieces) of metal monofilaments 1 constituting the metal cord 2, provided that d>0, and w 1 >0, and n is an integer.
  • w 1 >0 that is, since a gap is provided between adjacent metal monofilaments 1, the elastomer 3 will enter the gap, and the continuous non-elastomer covered area between the metal monofilaments 1 will be eliminated. Therefore, it becomes possible to sufficiently infiltrate the elastomer between adjacent metal monofilaments 1. As a result, the metal cord can be deformed out of plane during compression input, and bending of the metal cord can be suppressed. Further, since there is no water passage path for water when the tire is damaged and flooded, corrosion resistance is greatly improved.
  • the adjacent metal monofilaments 1 are restrained by the elastomer 3, the adjacent metal monofilaments do not shift from each other even when the tire is rolling, and as a result, the in-plane rigidity of the belt can be improved.
  • the plunger durability and steering stability of the tire can be further improved.
  • FIG. 5 shows an explanatory diagram related to the regulation of the ratio of the cross-sectional area of the metal monofilament included in the cross-section of the metal cord.
  • seven metal monofilaments 1 are aligned without being twisted to form a metal cord 2.
  • seven unshaped straight metal monofilaments 1 are arranged at equal intervals. They are arranged in parallel with a gap and covered with an elastomer 3.
  • the term "equally spaced gaps” means a range that includes manufacturing errors.
  • the above formula (1) defines the ratio of the cross-sectional area of the metal monofilament 1 to one metal cord 2, with the cross-sectional area of the dotted line in the figure being the cross-sectional area of the metal cord 2.
  • the cross-sectional area of the dotted line in the figure (cross-sectional area of the metal monofilament 1 + cross-sectional area of the elastomer 3) is the denominator ⁇ d ⁇ [d ⁇ n+w 1 ⁇ (n-1)] ⁇ in the above formula (1).
  • the cross-sectional area of the metal monofilament 1 included in the dotted line portion in the figure is represented by [(d/2) 2 ⁇ n] of the molecule in the above formula (1).
  • a metal cord 2 consisting of a bundle of metal monofilaments 1 aligned with a predetermined gap is used, and the ratio of the cross-sectional area of the metal monofilaments 1 included in the cross section of the metal cord 2 is defined within a predetermined range.
  • FIG. 6 shows an enlarged partial cross-sectional view of a belt according to an embodiment of the tire of the present invention.
  • the distance (also referred to as "interlayer gauge") G between the surfaces of the metal monofilaments 1 embedded in two adjacent belt layers 60A and 60B within the belt 60, and the distance w between the metal cords 2 2 , the ratio G/w 2 is preferably 1.6 or less.
  • the ratio w 1 /W between the interval w 1 between adjacent metal monofilaments 1 constituting the metal cord 2 and the width W of the metal cord 2 is preferably 0.07 or more.
  • the ratio d/w 1 between the filament diameter d of the metal monofilament 1 and the distance w 1 between adjacent metal monofilaments 1 constituting the metal cord 2 is 1.2 or more and less than 2. preferable.
  • the ratio w 1 /W between w 1 and the width W of the metal cord, and the ratio d/w between the filament diameter d of the metal monofilament 1 and the distance w 1 between adjacent metal monofilaments 1 constituting the metal cord 2 1 satisfies the above range, it is possible to achieve weight reduction and low rolling resistance without deteriorating distortion between the belt layers, plunger durability and steering stability of the tire. Become.
  • the ratio G/w 2 is more preferably 0.2 or more and 1.6 or less, even more preferably 0.4 or more and 1.4 or less. Further, the ratio w 1 /W is more preferably 0.07 or more and 0.18 or less, even more preferably 0.07 or more and 0.15 or less. Furthermore, the ratio d/w 1 is more preferably 1.3 or more and less than 2, even more preferably 1.4 or more and less than 2.
  • the distance G between the surfaces of the metal monofilaments 1 embedded in two adjacent belt layers in the belt is preferably 0.10 mm or more and 0.60 mm or less, and more preferably is 0.35 mm or more and 0.45 mm or less.
  • interlayer gauge G By setting the interlayer gauge G to 0.10 mm or more and 0.60 mm or less, it is possible to achieve a well-balanced effect of suppressing strain between the belt layers and achieving light weight and low rolling resistance.
  • the interlaminar gauge G becomes smaller, the belt layer becomes thinner, which is advantageous in terms of weight reduction and lower rolling resistance, but interlaminar strain deteriorates.
  • the metal monofilament 1 is a substantially straight metal monofilament, but in the tire of the present invention, the shape of the metal monofilament may be other than straight.
  • FIG. 7 is a schematic plan view of the metal cord of the belt layer according to another embodiment of the tire of the present invention
  • FIG. 8 is a schematic plan view of the metal cord of the belt layer according to another embodiment of the tire of the present invention in the width direction. It is a schematic sectional view.
  • the metal cord 2 shown in FIGS. 7 and 8 includes adjacent metal monofilaments 1 in which at least one of the amount of patterning and the patterning pitch in the direction perpendicular to the extending direction of the metal monofilament 1 is different. At least one pair exists. Preferably, in 50% or more of the pairs, adjacent metal monofilaments 1 differ in at least one of the amount of patterning and the patterning pitch in the direction perpendicular to the extending direction of the metal monofilaments 1.
  • FIG. 9 is an explanatory diagram of a metal monofilament showing definitions of the molding amount h and the molding pitch p of the metal monofilament, and the molding amount h refers to the width of variation of the metal monofilament 1 that does not include the filament diameter. Note that the molding amount h of the metal monofilament 1 is measured by projecting the metal monofilament 1 after molding with a projector and projecting the projected image of the metal monofilament on a screen or the like.
  • shaped metal monofilaments 1a and unshaped metal monofilaments 1b are arranged alternately, but metal monofilaments with different embossed amounts are arranged alternately. They may be arranged alternately, or metal monofilaments with different patterning pitches may be arranged alternately.
  • the arrangement of the metal monofilaments constituting the bundle is such that both sides of the metal monofilaments are straight metal monofilaments that are not shaped. In this way, by arranging the metal monofilaments 1 having different molding amounts or molding pitches adjacent to each other, it is possible to avoid matching the phases of the two. With such a configuration, it is possible to sufficiently infiltrate the elastomer between the adjacent metal monofilaments 1, and as a result, the metal cord can be deformed out of plane during compression input, and bending of the metal coat can be suppressed.
  • the molding amount h of the metal monofilament 1 is preferably about 0.03 to 0.30 mm. If the molding amount h is 0.30 mm or less, a decrease in the strength of the belt layer can be sufficiently suppressed.
  • the molding amount h is preferably 0.03 to 0.30 mm, more preferably 0. 0.03 to 0.25 mm, more preferably 0.03 to 0.20 mm.
  • the molding pitch p of the metal monofilament 1 is preferably 2 to 30 mm, more preferably 2 to 20 mm, even more preferably 3 to 15 mm.
  • FIG. 10 is a schematic cross-sectional view in the width direction of the metal cord of the belt layer of another embodiment of the tire of the present invention. Even with such a structure, it is possible to sufficiently infiltrate the elastomer between adjacent metal monofilaments 1. However, from the viewpoint of lightness, it is preferable that the patterning direction of adjacent metal monofilaments 1 be in the width direction of the metal cord 2 because the belt layer can be made thinner.
  • At least one of the metal monofilaments 1 in the metal cord 2 is a substantially straight metal monofilament.
  • FIGS. 7 and 8 when an unshaped straight metal monofilament 1b and a shaped metal monofilament 1a are adjacent to each other, a large amount of elastomer infiltrates between the two metal monofilaments 1. The elastomer coverage of the matching metal monofilament 1 on the side surfaces in the width direction of the metal cord 2 is increased.
  • straight metal filaments as the metal monofilaments 1 placed at both ends of the metal cord 2, the distance w2 between adjacent metal cords 2 in the elastomer can be increased, improving durability. can be done.
  • FIG. 7 it is more preferable that unshaped straight metal monofilaments 1b and shaped metal monofilaments 1a are alternately arranged.
  • FIG. 11 is a schematic plan view of the metal cord of the belt layer according to another embodiment of the tire of the present invention
  • FIG. 12 is a widthwise direction of the metal cord of the belt layer according to another embodiment of the tire of the present invention. It is a schematic sectional view.
  • FIG. 13 is an explanatory diagram of a metal monofilament showing definitions of the patterning amount h and the patterning pitch p of the metal monofilament, and the patterning amount h refers to the width of variation of the metal monofilament 1 that does not include the filament diameter.
  • the molding amount h of the metal monofilament 1 is measured by projecting the metal monofilament 1 after molding with a projector and projecting the projected image of the metal monofilament on a screen or the like.
  • the phases of the metal monofilaments 1 having the same molding amount h and the same molding pitch p are made to be different, thereby preventing the two phases from matching.
  • this configuration it is possible to sufficiently infiltrate the elastomer between adjacent metal monofilaments 1, and as a result, the metal cord can be deformed in-plane during compression input, reducing fatigue of the metal cord. It can prevent sexual deterioration.
  • adjacent metal monofilaments have different phases at at least one location in the metal cord 2, but the phase difference is preferably from ⁇ /4 to 7 ⁇ /4.
  • the phase difference is preferably from ⁇ /4 to 7 ⁇ /4.
  • the phase difference is ⁇ /2 to 3 ⁇ /2, and particularly preferably, the phase difference is ⁇ .
  • the molding amount h of the metal monofilament 1 is preferably about 0.03 to 0.30 mm.
  • the molding amount h is 0.30 mm or less, a decrease in the strength of the belt layer can be sufficiently suppressed.
  • the molding amount h is preferably 0.03 to 0.30 mm, more preferably 0. 0.03 to 0.25 mm, more preferably 0.03 to 0.20 mm.
  • the molding pitch p of the metal monofilament 1 is preferably 2 to 30 mm, more preferably 2 to 20 mm, and even more preferably 3 to 15 mm.
  • FIG. 14 is a schematic cross-sectional view in the width direction of the metal cord of the belt layer of another embodiment of the tire of the present invention. Even with such a structure, it is possible to sufficiently infiltrate the rubber between adjacent metal monofilaments 1. However, from the viewpoint of lightness, it is preferable that the patterning direction of adjacent metal monofilaments 1 be in the width direction of the metal cord 2 because the belt layer can be made thinner.
  • FIG. 15 is a schematic cross-sectional view in the width direction of the metal cord of the belt layer of still another embodiment of the tire of the present invention.
  • the metal monofilament 1 is spiral-shaped, and five spiral-shaped metal monofilaments 1 are aligned in a row without being twisted together to form the metal cord 2.
  • FIG. 16 is a schematic plan view of the metal cord of the belt layer according to another embodiment of the tire of the present invention
  • FIG. 17 is a schematic plan view of the metal cord of the belt layer according to another embodiment of the tire of the present invention in the width direction. It is a schematic sectional view.
  • the metal cord 2 shown in FIGS. 16 and 17 there is at least one pair of adjacent metal monofilaments 1 that differ in at least one of the amount of three-dimensional molding and the molding pitch.
  • adjacent metal monofilaments 1 differ in at least one of the amount of three-dimensional molding and the molding pitch.
  • the embossed amount h and the embossed pitch p of the metal monofilament are as shown in FIG. 13, and the embossed amount h refers to the range of variation that does not include the filament diameter of the metal monofilament 1.
  • the molding amount h of the metal monofilament 1 is measured by projecting the metal monofilament 1 after molding with a projector and projecting the projected image of the metal monofilament on a screen or the like.
  • spirally shaped metal monofilaments 1a and unshaped metal monofilaments 1b are arranged alternately.
  • the metal monofilaments 1 having different molding amounts or molding pitches adjacent to each other it is possible to avoid matching the phases of the two.
  • the molding amount h of the metal monofilament 1 is preferably about 0.10 to 0.50 mm.
  • the molding amount h is preferably 0.2 to 0.3 mm.
  • the molding pitch p of the metal monofilament 1 is preferably 5 mm or more, more preferably 8 to 20 mm.
  • At least one of the metal monofilaments 1 in the metal cord 2 is a substantially straight metal monofilament.
  • a substantially straight metal monofilament As shown in FIGS. 16 and 17, when an unshaped straight metal monofilament 1b and a shaped metal monofilament 1a are adjacent to each other, a large amount of elastomer infiltrates between the two metal monofilaments 1. The elastomer coverage of the metal monofilament 1 on the side surfaces in the width direction of the metal cord 2 is increased. Furthermore, by using straight metal monofilaments as the metal monofilaments 1 placed at both ends of the metal cord 2, the distance w2 between adjacent metal cords 2 in the elastomer can be increased, which improves the durability of the belt. can be improved. Moreover, as shown in FIGS. 16 and 17, it is more preferable that unshaped straight metal monofilaments 1b and shaped metal monofilaments 1a are arranged alternately.
  • FIG. 18 is a schematic cross-sectional view of an end portion of a belt according to another embodiment of the tire of the present invention.
  • the belt 60 shown in FIG. 18 includes a first belt layer 60A and a second belt layer 60B laminated on the outside of the first belt layer 60A in the tire radial direction.
  • the belt is composed of two belt layers, but the belt may be composed of three or more belt layers.
  • the shortest distance a between the metal monofilament 1B of the second belt layer 60B and the metal monofilament 1A of the first belt layer 60A at the tire center portion, and the end of the second belt layer 60B is expressed by the following formula (2): 1.8 ⁇ b/a ⁇ 4.0 It is preferable that the following relationship is satisfied.
  • a is the shortest distance between the metal monofilament of the second belt layer and the metal monofilament of the first belt layer in the tire center portion
  • b is the shortest distance between the metal monofilament of the end of the second belt layer and the metal monofilament of the first belt layer. This is the shortest distance between one belt layer and the metal monofilament.
  • the belt interlayer rubber 4 is arranged, but the thickness of the elastomer (covering rubber) 3 at the ends of the belt layers 60A, 60B may be increased, or the ends of the belt layers 60A, 60B may be It may also be wrapped in a rubber sheet. Note that the same material as the elastomer (covering rubber) 3 of the first belt layer 60A and second belt layer 60B can be used for the rubber sheet wrapping the end portions of the belt interlayer rubber 4 and the belt layers 60A and 60B.
  • FIG. 19 is a schematic cross-sectional view of the center portion of a belt according to another embodiment of the tire of the present invention, which is the portion surrounded by a broken line in FIG. 18.
  • the distances c1 and c2 from both upper and lower surfaces of the first belt layer 60A at the tire center portion to the metal monofilament 1A are both 0.14 mm or less
  • the distances c1 and c2 from the upper and lower surfaces of the first belt layer 60A at the tire center portion are both 0.14 mm or less
  • the tire of the present invention may be obtained by molding an unvulcanized rubber composition and then vulcanizing it, or by using a semi-vulcanized rubber that has undergone a pre-vulcanization process, etc. After molding, it may be obtained by further main vulcanization.
  • members other than the belt (belt layer) and belt reinforcing layer of the tire of the present invention are not particularly limited, and known members can be used.
  • the tire of the present invention is preferably a pneumatic tire, and the gas filled in the pneumatic tire may include normal or air with adjusted oxygen partial pressure, as well as inert gas such as nitrogen, argon, helium, etc. Gas can be used.
  • the metal cord of Comparative Example 3 is one in which steel monofilaments with a filament diameter of 0.35 mm are evenly arranged without being twisted.
  • the metal cord of Reference Example 1 is a cord consisting of a bundle of five steel monofilaments each having a filament diameter of 0.26 mm, which are aligned in a row without being twisted.
  • the metal cord of Comparative Example 4 is a cord made of a bundle of three steel monofilaments each having a diameter of 0.3 mm and arranged in a line without being twisted.
  • a passenger car tire with a tire size of 195/65R15 having the structure shown in FIG. 1 except for not having a belt reinforcing layer was produced by applying each steel cord-rubber composite to two belt layers.
  • the belt angle was ⁇ 28° with respect to the tire circumferential direction.
  • in-plane stiffness was evaluated by a conventional method and used as an index of handling stability.
  • the results are indexed with the in-plane stiffness value of Comparative Example 1 as 100, and based on this index value, if it is less than 90, it is ⁇ , if it is 90 or more and less than 100, it is ⁇ , and if it is 100 or more and less than 110.
  • a score of 110 or more was evaluated as a score of ⁇ .
  • the cords of Comparative Examples 1 and 2 are cords with an oval cross section, and the filament diameter of the metal filament in Comparative Examples 1 and 2 is the average cord diameter [(major axis 0.64 mm + minor axis 0.53 mm)/2] means.
  • the cords of Comparative Examples 1 and 2 are cords with an elliptical cross section, and the distance between the metal monofilaments (inter-cord distance) varies depending on the direction in which the cord is implanted.
  • the outer side of the belt in the tire radial direction has a cutting strength of 6.5 cN/dtex or more, a cutting elongation of 10% or more, and an elastic modulus at 7% elongation of 6.5 cN/dtex.
  • the belt reinforcing layer supplements the rigidity of the belt, improving the plunger durability and steering stability of the tire. It can be confirmed that the performance improves.
  • the outer side of the belt in the tire radial direction has a cutting strength of 6.5 cN/dtex or more, a cutting elongation of 10% or more, and an elastic modulus at 7% elongation of 6.5 cN/dtex.
  • a belt reinforcing layer is provided in which a cord made of polyethylene terephthalate of 0 mN/(dtex ⁇ %) or more is coated with an elastomer, and further, a belt reinforcing layer is provided at the ends of the belt (the ends of the first belt layer and the ends of the second belt layer).
  • Tangent line, 1, 1A, 1B Metal monofilament
  • 2 Metal cord
  • 3 Elastomer (coated rubber)
  • w 1 Distance between adjacent metal monofilaments constituting the metal cord
  • w 2 Distance between metal cords
  • t Thickness of the belt layer
  • d Filament diameter of the metal monofilament (strand diameter, wire diameter, diameter)
  • G Distance between the surfaces of the metal monofilaments embedded in two adjacent belt layers in the belt ( (interlayer gauge)
  • h patterning amount of metal monofilament
  • p patterning pitch of metal monofilament
  • 1a patterned metal monofilament
  • 1b unshaped metal monofilament
  • 4 belt interlayer rubber

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

Le problème abordé par la présente invention est de fournir un pneu qui améliore la stabilité de direction et qui peut maintenir une durabilité de piston même lorsqu'il est rendu léger. La solution à ce problème est un pneu (100), équipé d'une courroie (60) qui comprend au moins deux couches de courroie (60A, 60B) disposées dans une section de bande de roulement (30) et des couches de renforcement de courroie (70A, 70B) qui sont disposées sur les côtés externes, dans la direction radiale du pneu, de la courroie (60). Le pneu (100) est caractérisé en ce que : les couches de courroie (60A, 60B) et les couches de renforcement de courroie (70A, 70B) sont formées en recouvrant un matériau de renforcement par un élastomère ; le matériau de renforcement des couches de courroie (60A, 60B) est des monofilaments métalliques présentant un diamètre de filament d inférieur à 0,30 mm ; et le matériau de renforcement des couches de renforcement de courroie (70A, 70N) est des cordons de fibres organiques présentant une résistance à la rupture d'au moins 6,5 cN/dtex, un allongement de coupe d'au moins 10 %, et un module d'élasticité, lorsqu'ils sont étirés de 7 %, d'au moins 6,0 mN/ (dtex∙%).
PCT/JP2023/000859 2022-05-26 2023-01-13 Pneu WO2023228464A1 (fr)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008013035A (ja) * 2006-07-05 2008-01-24 Bridgestone Corp 空気入りタイヤ
JP2011189873A (ja) * 2010-03-16 2011-09-29 Bridgestone Corp 空気入りタイヤ
JP2020066394A (ja) * 2018-10-26 2020-04-30 横浜ゴム株式会社 空気入りラジアルタイヤ
JP2020132056A (ja) * 2019-02-22 2020-08-31 横浜ゴム株式会社 空気入りタイヤ
JP2021024510A (ja) * 2019-08-08 2021-02-22 横浜ゴム株式会社 空気入りタイヤ
JP2021115984A (ja) * 2020-01-27 2021-08-10 横浜ゴム株式会社 空気入りタイヤ
JP2021165087A (ja) * 2020-04-07 2021-10-14 横浜ゴム株式会社 空気入りタイヤ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008013035A (ja) * 2006-07-05 2008-01-24 Bridgestone Corp 空気入りタイヤ
JP2011189873A (ja) * 2010-03-16 2011-09-29 Bridgestone Corp 空気入りタイヤ
JP2020066394A (ja) * 2018-10-26 2020-04-30 横浜ゴム株式会社 空気入りラジアルタイヤ
JP2020132056A (ja) * 2019-02-22 2020-08-31 横浜ゴム株式会社 空気入りタイヤ
JP2021024510A (ja) * 2019-08-08 2021-02-22 横浜ゴム株式会社 空気入りタイヤ
JP2021115984A (ja) * 2020-01-27 2021-08-10 横浜ゴム株式会社 空気入りタイヤ
JP2021165087A (ja) * 2020-04-07 2021-10-14 横浜ゴム株式会社 空気入りタイヤ

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