WO2017061292A1 - タイヤ - Google Patents
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- Publication number
- WO2017061292A1 WO2017061292A1 PCT/JP2016/078305 JP2016078305W WO2017061292A1 WO 2017061292 A1 WO2017061292 A1 WO 2017061292A1 JP 2016078305 W JP2016078305 W JP 2016078305W WO 2017061292 A1 WO2017061292 A1 WO 2017061292A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tire
- reinforcing layer
- resin
- layer
- bead core
- Prior art date
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Classifications
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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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/007—Inflatable pneumatic tyres or inner tubes made from other material than rubber
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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
- B60C9/0042—Reinforcements made of synthetic materials
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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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/01—Inflatable pneumatic tyres or inner tubes without substantial cord reinforcement, e.g. cordless tyres, cast tyres
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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
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/48—Tyre cords
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/39—Aldehyde resins; Ketone resins; Polyacetals
- D06M15/41—Phenol-aldehyde or phenol-ketone resins
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
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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
- B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
- B60C2009/0092—Twist structure
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2046—Polyamides, e.g. nylons
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2046—Tire cords
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
Definitions
- the present invention relates to a tire.
- thermoplastic polymer material such as a thermoplastic elastomer (TPE) or a thermoplastic resin
- TPE thermoplastic elastomer
- thermoplastic resin a thermoplastic resin
- Such tires are economical and highly recyclable.
- a reinforcing layer on the skeleton member.
- a cord member made of an inorganic material or an organic material is used, and among them, a specific organic fiber is advantageous from the viewpoint of light weight, economy, and strength.
- the radial rigidity of the tire can be maintained by covering the cord member with rubber or a resin material.
- a technique for bonding the organic fiber and the rubber for example, there is a technique for bonding the fiber with an epoxy compound or an isocyanate compound (for example, JP 2004-339299 A and International Publication No. 2014/074404).
- an epoxy compound or an isocyanate compound for example, JP 2004-339299 A and International Publication No. 2014/074404.
- a bonding method using resorcinol-formaldehyde-latex resin for example, JP-A-2001-73247).
- the present disclosure is intended to provide a tire having a reinforcing layer in which a cord member and a resin material are sufficiently bonded in consideration of the above situation.
- a resin-made tire skeleton member having a bead portion and a side portion continuous to the outside in the tire radial direction of the bead portion; and a reinforcing layer including organic fibers and a resin material covering the organic fibers, and the organic
- the tire includes a cord member including a nylon-based fiber material and an adhesive layer formed on the cord member and formed of a composition including resorcinol-formaldehyde resin.
- a tire having a reinforcing layer in which a cord member and a resin material are sufficiently bonded is provided.
- FIG. 1 It is a side view which shows the reinforcement layer in which the tire radial direction inner side end was narrowly formed. It is a perspective view which shows the state which wound the tire radial direction inner side end of the reinforcement layer around the bead core, and was fixed. It is sectional drawing which shows the example which fixed the tire radial direction inner side end of the reinforcement layer to the side part of the bead core. It is sectional drawing which shows the example which has arrange
- 10B is a cross-sectional view illustrating a state in which the tire frame member is molded, the reinforcing layer and the bead core illustrated in FIG. 10A are integrated, and the belt layer is disposed on the crown portion of the tire frame member.
- a tire according to the present disclosure includes a resin tire skeleton member having a bead portion and a side portion continuous to a tire radial outside of the bead portion, and a reinforcing layer including organic fibers and a resin material covering the organic fibers.
- the organic fiber is a cord member containing a nylon-based fiber material, and an adhesive layer formed on the cord member and containing a resorcinol-formaldehyde resin (hereinafter sometimes referred to as “RF layer” as appropriate).
- RF layer resorcinol-formaldehyde resin
- the organic fibers are firmly adhered and fixed to the resin material in the reinforcing layer. Further, when the reinforcing layer is disposed in contact with the inside or the surface of the tire frame member, the reinforcing layer is formed using a resin material, and therefore, the reinforcing layer and the tire frame member are compared with the case where rubber is used. Can increase the adhesive strength.
- “to” representing a numerical range represents a range including upper and lower numerical values.
- the value of the adhesive strength between the organic fiber and the resin material is obtained using, for example, a method for measuring the adhesive force between the vulcanized rubber and the organic fiber cord in the test piece described in International Publication No. 201010259992. be able to. That is, the adhesive strength between the organic fiber and the resin material in the test piece was determined by a test method based on “7. Peel test” defined in JIS K6301 (1995).
- a test method based on “7. Peel test” defined in JIS K6301 (1995).
- the reinforcing layer in the present disclosure includes organic fibers and a resin material that covers the organic fibers.
- the reinforcing layer is a layer that reinforces the tire of the present disclosure, preferably the tire frame member, and the arrangement of the reinforcing layer is not particularly limited as long as the tire, preferably the tire frame member can be reinforced. It arrange
- the reinforcing layer is disposed on the tire frame member, in addition to an aspect in which the reinforcing layer is provided inside the tire frame member itself, the reinforcing layer is disposed on the inner surface or the outer surface of the tire frame member.
- positioned away from the tire frame member may be sufficient as the reinforcement layer, for example, the aspect in which another layer exists between a tire frame member and a reinforcement layer may be sufficient.
- the reinforcing layer is formed to include organic fibers and a resin material that covers the organic fibers.
- the organic fiber may be completely covered with the resin material, or may have a portion where the organic fiber is not covered with the resin material in the reinforcing layer.
- the reinforcing layer may be a layer that extends from the bead portion of the tire to the side portion and is arranged side by side with a space in the tire circumferential direction, for example.
- the thickness of the reinforcing layer is preferably adjusted as appropriate according to the purpose, such as the material and thickness of the organic fiber.
- the purpose such as the material and thickness of the organic fiber.
- the organic fiber in the present disclosure includes a cord member including a nylon fiber material (hereinafter referred to as a cord member) and an adhesive layer formed on the cord member and formed of a composition including resorcinol-formaldehyde resin.
- the adhesive layer is preferably provided so as to cover the entire surface of the cord member, but has a region that does not cover the surface of the cord member in a part of the surface as long as the effect of the present invention is not impaired. May be.
- the adhesive layer is preferably provided so that at least a part thereof is in direct contact with the surface of the cord member, and all the surfaces of the adhesive layer facing the cord member are in direct contact with the surface of the cord member. More preferably.
- the cord member constituting the organic fiber according to the present disclosure is a single strand of a single multifilament obtained by twisting a plurality of monofilaments, or a strand of two or more of the multifilaments. It is preferable. Further, depending on the purpose, for example, only one multifilament may be used, or only a monofilament may be used without using the multifilament. Here, plural means 10 or more. As the cord member, for example, a multifilament made of a nylon fiber material can be used. The structure of the organic fiber will be specifically described with reference to FIGS. 1A, 1B, and 1C. Drawing 1A is a schematic diagram for explaining cord member 1 which constitutes organic fiber in this indication. A cord member 1 shown in FIG.
- 1A is formed by gathering a predetermined number of monofilaments f and twisting two multifilaments M formed by twisting a predetermined number of them.
- the number of monofilaments f to be assembled, the number of twists, the number of multifilaments M to be assembled, the number of twists, the material, and the like can be appropriately adjusted.
- the fineness of all the filaments constituting the cord member 1 is not particularly limited as long as the effect of the present invention is not impaired.
- it can be set to 500 dtex / 2 or more and 3000 dtex / 2 or less.
- FIG. 1B is a schematic view of the organic fiber 4 in the present disclosure, and shows a schematic cross section when a multifilament constituting the organic fiber 4 is cut perpendicular to the fiber axis direction.
- FIG. 1C is the figure which expanded the schematic cross section of the multifilament which comprises the organic fiber 4 shown by FIG. 1B.
- the organic fiber 4 has a structure in which the RF layer 3 is laminated around the cord member 1.
- the material forming each layer is bonded between the cord member 1 and the RF layer 3.
- the organic fiber 4 in the present disclosure can be used as a reinforcing layer in the present disclosure by covering part or all of a resin material as described later. As shown in FIG.
- the RF layer 3 is provided on the cord member 1 and covers the surface of the cord member 1.
- the RF layer 3 may be bonded to the cord member 1 on one surface.
- the RF layer 3 is preferably provided so as to cover the entire surface of the cord member 1.
- the RF layer 3 is adhered to the surface of the cord member 1 at a part of the surface within a range not impairing the effects of the present invention. May have no area.
- the outer peripheral surface of the RF layer 3 is covered with and adhered to the resin material when the organic fiber 4 is covered with the resin material in order to form the reinforcing layer.
- the number of organic fibers to be driven is preferably set as appropriate depending on the type of cord member used, the type of tire, and the like.
- the reinforcing layer when the diameter of the cord member is 0.5 mm, organic fibers obtained by twisting the cord members are arranged in parallel in a single line at regular intervals with a number of about 50 fibers per 50 mm. Preferred is the form.
- the cord members may be arranged evenly over the entire reinforcing layer or at intervals under the tread groove according to the shape of the tread.
- the cord member includes a nylon fiber material.
- the nylon-based fiber material refers to a fiber material that is a polymer (polyamide) in which monomers are bonded by an amide bond (—CO—NH—) and includes an aliphatic skeleton. Therefore, a polyamide (aramid) fiber material composed only of an aromatic skeleton is not included.
- nylon fiber material forming the cord member examples include nylon fibers made of nylon 6, nylon 11, nylon 12, nylon 66, nylon 612, and the like.
- the nylon 6 has a structural unit represented by, for example, ⁇ CO— (CH 2 ) 5 —NH ⁇ n (n is an arbitrary number of repeating units), and the nylon 11 has, for example, ⁇ CO— (CH 2 ) 10 —.
- NH ⁇ n (n is an arbitrary number of repeating units)
- the nylon 12 has a structure represented by ⁇ CO— (CH 2 ) 11 —NH ⁇ n (n is an arbitrary number of repeating units), for example.
- the nylon 66 has a structural unit represented by ⁇ CO (CH 2 ) 4 CONH (CH 2 ) 6 NH ⁇ n (n is an arbitrary number of repeating units), and the nylon 612 has, for example, It has a structural unit represented by ⁇ CO (CH 2 ) 10 CONH (CH 2 ) 6 NH ⁇ n (n is an arbitrary number of repeating units).
- the nylon fiber material can be synthesized by a known method such as ring-opening polycondensation of lactam or polycondensation of diamine and dibasic acid.
- the cord members included in the large number of organic fibers used for the reinforcing layer may all be a single type of fiber material, or the types of fiber materials may be different between organic fibers.
- the cord member may include a fiber material other than the nylon fiber material.
- a fiber material other than the nylon fiber material For example, a plurality of monofilaments made of the above-mentioned nylon fiber material and a plurality of monofilaments made of other types of fiber materials can be assembled, and a predetermined number of twists can be applied to form a multifilament.
- the cord member includes other fiber material other than the nylon-based fiber material, it is preferable to include a nylon-based fiber material as the fiber material constituting the surface of the cord member (the surface on which the RF layer is provided).
- the ratio (area ratio) occupied by the nylon fiber material is preferably 50% or more, more preferably 75% or more, and 100%. Particularly preferred.
- the cord member is made of nylon fiber material, if necessary, anti-aging agents such as styrenated phenols and hindered phenols, silicone-based, higher alcohol-based, mineral oil-based antifoaming agents, other reaction terminators, An additive such as an antifreezing agent may be included.
- the adhesive layer is a layer provided on the cord member, and is a layer formed of a composition containing resorcinol-formaldehyde resin (hereinafter sometimes referred to as “RF composition” as appropriate).
- the “layer formed of a composition containing a resorcinol-formaldehyde resin” is a layer formed by reacting a resorcinol-formaldehyde resin contained in an RF composition.
- the resorcinol-formaldehyde resin forming the RF layer (hereinafter also referred to as resorcinol-formaldehyde condensate) is a compound obtained by condensing a phenol compound containing at least part of resorcinol and formaldehyde.
- the resorcinol-formaldehyde condensate is preferably a resole type (a general form of phenol resin for adhesives) with little branching.
- a methylol group and a dimethylene ether bond do not remain, and as such, a compound in which the condensation reaction hardly proceeds even when heated, that is, a highly stable compound is preferable.
- the ratio of methylene bonds in the total number of binding sites between phenolic compounds can be preferably 90% or more, more preferably 95% or more, and still more preferably 97% or more. That is, it is considered preferable that several phenolic compound molecules are bonded in a substantially linear form only by a methylene bond.
- resorcinol-formaldehyde condensate part or all of the phenolic compound bonded by the formaldehyde-derived moiety is resorcinol.
- the resorcinol-formaldehyde condensate may be modified as disclosed in JP 2014-001270 A.
- the molar ratio (F / R) of formaldehyde (F) and resorcinol (R) used for forming the RF layer can be appropriately selected according to the purpose.
- the resorcinol-formaldehyde condensate can be obtained by adding formaldehyde to resorcinol dissolved in a solvent, and stirring and mixing at a predetermined temperature and for a predetermined time.
- a solution used in this case acidic, neutral or alkaline water, or an organic solvent such as acetone or alcohol can be used.
- alkaline water is obtained by dissolving sodium hydroxide, lithium hydroxide, potassium hydroxide, animmonium hydroxide, or an organic amine such as monomethylamine or ammonia in water.
- any anionic surfactant can be used by being dispersed in neutral water by a ball mill or a sand mill. In this case, in order to effectively develop the adhesive force, it is preferable to reduce the amount of the surfactant so that the dispersed state does not deteriorate.
- the RF layer is formed, for example, as an adhesive layer (RF layer) adhered to the cord member by applying (applying) the RF composition onto the cord member and reacting the RF composition with the cord member. Can do.
- the resorcinol-formaldehyde condensate reacts with a functional group on the surface of the cord member, and the condensate entangles three-dimensionally to form an RF layer firmly adhered to the cord member.
- the reaction of the RF composition is preferably performed by heating, and the reaction temperature in the case of heating is preferably 160 ° C. to 180 ° C.
- the content of resorcinol-formaldehyde resin contained in the RF layer is not particularly limited, but is preferably 2% by mass or more and 20% by mass or less, more preferably 3% by mass or more and 10% by mass or less in terms of solid content. It is.
- the content of the adhesive layer in the organic fiber is preferably 0.5% by mass to 3.0% by mass with respect to the total mass of the organic fiber.
- the adhesiveness between the cord member 1 and the adhesive layer (RF layer) 3 can be further improved, and the adhesive strength between the organic fiber and the resin material can be further increased.
- the reinforcing layer can be made lighter and more economical.
- the content of the adhesive layer is, for example, from the mass of the organic fiber after the RF composition is adhered and impregnated on the cord member 1 and dried, to the mass of the organic fiber before the composition is adhered and impregnated Can be calculated by subtracting.
- the resin material is a material that is included in the reinforcing layer and covers the organic fiber.
- the resin material means that it does not contain vulcanized rubber such as conventional natural rubber and synthetic rubber.
- any of a thermoplastic resin and a thermosetting resin can be used.
- a thermoplastic resin (including a thermoplastic elastomer) refers to a polymer compound that softens and flows as the temperature rises and becomes relatively hard and strong when cooled. In the present specification, among these, the material softens and flows with increasing temperature, and becomes relatively hard and strong when cooled, and a high molecular compound having rubber-like elasticity is a thermoplastic elastomer, and the material increases with increasing temperature.
- thermosetting resin refers to a polymer compound that forms and cures a three-dimensional network structure with increasing temperature.
- thermoplastic resin include polyurethane resins, polyolefin resins, polyvinyl chloride resins, and polyamide resins.
- thermoplastic resin polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), polyester-based thermoplastic elastomer ( TPC) and dynamically crosslinked thermoplastic elastomer (TPV).
- TPO polyolefin-based thermoplastic elastomer
- TPS polystyrene-based thermoplastic elastomer
- TPA polyamide-based thermoplastic elastomer
- TPU polyurethane-based thermoplastic elastomer
- TPC polyester-based thermoplastic elastomer
- TPV dynamically crosslinked thermoplastic elastomer
- thermoplastic material examples include, for example, a deflection temperature under load (0.45 MPa load) specified in ISO 75-2 or ASTM D648 of 78 ° C. or higher, and a tensile yield strength specified in JIS K7113 of 10 MPa or higher.
- the tensile fracture elongation (JIS K7113) specified in JIS K7113 is 50% or more. What has Vicat softening temperature (A method) prescribed
- thermosetting resin examples include phenol resin, urea resin, melamine resin, epoxy resin, and polyamide resin.
- a thermoplastic resin from the viewpoint of adhesion to the organic fiber, more preferably a polyamide thermoplastic resin or a polyurethane thermoplastic resin, and a polyamide thermoplastic elastomer (TPA). It is particularly preferred.
- the resin materials include acrylic resins, methacrylic resins, EVA resins, vinyl chloride resins, fluorine resins, silicone resins.
- General-purpose resin such as may be used.
- the elastic modulus of the polyamide-based thermoplastic resin material (tensile elastic modulus specified in JIS K7113 (1995)) is the thermoplastic resin forming the tire frame member.
- the elastic modulus is preferably set within a range of 0.1 to 10 times the elastic modulus.
- the resin constituting the reinforcing layer is not too soft and the belt surface Excellent shear rigidity and improved cornering force.
- the surface of the organic fiber is 20% or more of the polyamide thermoplastic resin material from the viewpoint of increasing the resistance to pulling out (hardness to pull out) of the organic fiber. It is preferably covered, and more preferably 50% or more.
- the content of the polyamide-based thermoplastic resin material in the reinforcing layer is 20% by mass or more from the viewpoint of increasing the pulling resistance of the organic fiber with respect to the total amount of the material constituting the reinforcing layer excluding the organic fiber. Is preferable, and 50 mass% or more is still more preferable.
- an organic fiber is formed on the outer periphery of the tire frame member formed of the polyamide-based thermoplastic resin material. It can be configured and formed so as to be at least partially covered.
- the resin material containing the polyamide-based thermoplastic resin on the outer periphery of the tire skeleton member covered with the organic fibers corresponds to the resin material constituting the reinforcing layer, and the polyamide-based thermoplastic resin material forming the tire skeleton member;
- the reinforcing layer is composed of organic fibers.
- the reinforcing layer includes organic fibers and a resin material that covers the organic fibers.
- the reinforcing layer is preferably disposed on the tire frame member, and more preferably on the side portion of the tire frame member.
- the reinforcing layer disposed on the tire frame member has the following steps: (1) After an RF composition containing resorcinol-formaldehyde resin is applied to the surface of a cord member containing a nylon fiber material, it is heated to 160 ° C. to 180 ° C. to form an adhesive layer (RF layer).
- An RF processing step to obtain fibers (2) After the RF treatment step, a plurality of the organic fibers are juxtaposed at a desired interval on the tire frame member, and a resin material is applied to the surface of the adhesive layer (RF layer) on which the organic fibers are juxtaposed. And a resin coating treatment step of forming a reinforcing layer by heating later.
- an RF layer can be formed by applying an RF composition containing a resorcinol-formaldehyde condensate to the surface of the cord member and heating at a temperature of 160 ° C. to 180 ° C.
- a drying process for drying the coating film of the RF composition is provided, and then a baking process for baking the coating film of the RF composition is provided. May be.
- the solvent in the RF composition can be sufficiently removed, and the next baking step can be efficiently performed.
- the heating temperature is preferably in the range of 160 ° C. to 180 ° C. in both processes.
- the drying step it is preferable to dry at 160 ° C. to 180 ° C. for 70 seconds to 90 seconds, for example.
- the baking step for example, baking is preferably performed at 160 ° C. to 170 ° C. for 50 seconds to 70 seconds.
- known methods such as coating, dipping, and extrusion molding can be appropriately used.
- an RF layer can be efficiently formed by impregnating the cord member with an RF composition and baking it after drying as described above.
- the resin coating treatment step resin is coated on the cord member (that is, organic fiber) formed with the RF layer obtained in the RF treatment step, and heated at a predetermined temperature for a predetermined time, so that the organic fiber is a resin material.
- a coated reinforcing layer can be produced.
- the heating temperature in the resin coating treatment step is preferably adjusted as appropriate depending on the resin material used. For example, when a polyamide-based thermoplastic resin is used as the resin material, the heating temperature is preferably 220 ° C. to 280 ° C.
- the method of coating (coating) the resin material on the organic fiber in the present disclosure is not particularly limited.
- the organic fiber is installed in a general laminator (coating device) and the resin is extruded at a temperature of 220 ° C. to 280 ° C.
- a laminator press temperature 200 ° C. to 250 ° C.
- the arrow C direction indicates the tire circumferential direction
- the arrow R direction indicates the tire radial direction
- the arrow W direction indicates the tire width direction.
- the tire radial direction means a direction orthogonal to a tire axis (not shown).
- the tire width direction means a direction parallel to the tire rotation axis.
- the tire width direction can be rephrased as the tire axial direction.
- the tire 10 according to the present embodiment includes a tire frame member 12 and a reinforcing layer 14.
- the tire frame member 12 is made of resin, and is connected to a bead portion 16, a side portion 18 that is continuous to the outside in the tire radial direction of the bead portion 16, and a tread 32 that is continuous to the inside of the side portion 18 in the tire width direction. And a crown portion 26.
- the bead part 16 means here from the tire radial direction inner side end of the tire frame member 12 to 30% of the cross-sectional height of the tire frame member 12.
- the tire frame member 12 has an annular shape centered on the tire axis.
- the resin constituting the tire skeleton member 12 include thermoplastic resins (including thermoplastic elastomers), thermosetting resins, and other general-purpose resins, as well as engineering plastics (including super engineering plastics).
- the resin here does not include vulcanized rubber.
- the resin used in the first embodiment include a thermoplastic resin (including a thermoplastic elastomer) and a thermosetting resin, and the definition thereof is the same as described above.
- TPO polyolefin-based thermoplastic elastomer
- TPS polystyrene-based thermoplastic elastomer
- TPA polyamide-based thermoplastic elastomer
- thermoplastic material examples include, for example, a deflection temperature under load (0.45 MPa load) specified in ISO 75-2 or ASTM D648 of 78 ° C. or higher, and a tensile yield strength specified in JIS K7113 of 10 MPa or higher.
- the tensile fracture elongation (JIS K7113) specified in JIS K7113 is 50% or more. What has Vicat softening temperature (A method) prescribed
- thermosetting resin examples include phenol resin, epoxy resin, melamine resin, urea resin, and the like.
- the resin materials include acrylic resins, methacrylic resins, EVA resins, vinyl chloride resins, fluorine resins, silicone resins.
- General-purpose resin such as may be used.
- a bead core 22 is embedded in the bead portion 16.
- the thermoplastic material constituting the bead core 22 is preferably an olefin-based, ester-based, amide-based, or urethane-based TPE, or TPV partially kneaded with a rubber-based resin.
- the deflection temperature under load specified at ISO 75-2 or ASTM D648 (at the time of 0.45 MPa load) is 75 ° C. or higher
- the tensile yield elongation similarly specified by JIS K7113 is 10% or higher.
- the tensile fracture elongation specified in JIS K7113 is 50% or more and the Vicat softening temperature (Method A) specified in JIS K7113 is 130 ° C. or more.
- the bead core 22 has an annular shape and is made of a thermoplastic material having a higher elastic modulus than the resin material of the tire frame member 12.
- the elastic modulus of the bead core 22 is preferably 1.5 times or more, and more preferably 2.5 times or more that of the tire frame member 12. If it is 1.5 times or less, when the tire 10 is assembled to the rim 24 and filled with air to increase the internal pressure, the bead portion 16 is lifted outward in the tire radial direction, so that it may be disengaged from the rim 24.
- the bead core 22 may be formed by insert molding (injection molding) using a hard resin, and the method for forming the bead core 22 is not particularly limited.
- the bead core 22 has, for example, a circular cross section. Further, the bead core 22 may have a waved shape so that the bead core radius varies depending on the position in the tire circumferential direction. In this case, the bead core 22 itself can be extended to some extent, and rim assembly becomes easy.
- the bead core 22 is not limited to a resin (thermoplastic material), and may be formed by stacking resin-coated steel cords in a spiral shape in the tire circumferential direction.
- a crown portion 26 is connected to the outer side of the side portion 18 in the tire radial direction.
- a belt layer 28 is provided on the outer periphery of the crown portion 26.
- the belt layer 28 is formed by, for example, winding a resin-coated cord in a spiral shape in the tire circumferential direction.
- a tread 32 is provided outside the crown portion 26 and the belt layer 28 in the tire radial direction.
- the tread 32 is, for example, a pre-cured tread (PCT) formed using rubber.
- the tread 32 is made of rubber having higher wear resistance than the resin material forming the tire frame member 12.
- SBR styrene-butadiene rubber
- the reinforcing layer 14 is covered with a resin material, and the reinforcing layer 14 extends from the bead portion 16 to the side portion 18 and is arranged side by side in the tire circumferential direction.
- the reinforcing layer 14 is formed longer in the tire radial direction than in the tire circumferential direction in a state where the reinforcing layer 14 is extended in a plane.
- the resin material for example, the same resin material as that constituting the tire frame member 12 is used.
- the coating with the resin material may be on one side of the organic fiber 30 or on both sides. When both surfaces of the organic fiber 30 are covered with a resin material, the organic fiber 30 can be disposed in the center of the reinforcing layer 14 in the thickness direction. In the case of double-sided coating, different resin materials may be used for one surface and the other surface.
- the organic fiber 30 is composed of two components: a cord member including a nylon fiber material and an adhesive layer (RF layer) formed on the cord member and formed of an RF composition including resorcinol-formaldehyde resin. Yes.
- the organic fiber 30 extends at least along the tire radial direction.
- the organic fibers 30 may be combined with the organic fibers 30 extending in the tire circumferential direction so that the organic fibers 30 cross each other. In this case, the organic fiber 30 may be woven or knitted to form a cloth.
- the organic fiber 30 may be inclined with respect to the tire radial direction or the tire circumferential direction.
- the inner end 14 ⁇ / b> A in the tire radial direction of the reinforcing layer 14 is located on the inner side in the tire radial direction from the rim separation point P of the bead portion 16.
- the rim separation point P is a state in which the specified internal pressure is not applied when the tire is mounted on a rim described in the 2013 edition YEAR BOOK issued by JATMA (Japan Automobile Tire Association) along the tire dimensions.
- the tire is separated from the rim flange.
- the reinforcing layer 14 is fastened to a bead core 22 embedded in the bead portion 16.
- the inner end 14A in the tire radial direction of the reinforcing layer 14 is wound around the bead core 22 so as to go around the bead core 22, for example, and is folded back from the inner side of the tire to be bonded to the reinforcing layer 14 itself.
- a joining means hot air welding or thermocompression bonding using a hot plate is preferable. Sewing may be used as another joining means.
- the joining length L is 3 mm or more, more preferably 5 mm or more, and still more preferably 15 mm or more. Note that the winding (turning back) of the tire radial direction inner end 14A of the reinforcing layer 14 may be from the tire outer side to the inner side.
- the outer end 14 ⁇ / b> C in the tire radial direction of the reinforcing layer 14 extends from the bead portion 16 of the tire frame member 12 to the crown portion 26 through the side portion 18 and overlaps the belt layer 28.
- the overlap amount OP with the belt layer 28 is preferably 5 mm or more from the end of the belt layer 28 toward the center in the tire width direction.
- the reinforcing layer 14 may extend to the center in the tire width direction. It should be noted that the position of the outer end 14C in the tire radial direction of the reinforcing layer 14 may end near the tire maximum width position in the side portion 18 or end before the crown portion 26 (so-called buttress portion). May be.
- the outer surface 14B of the reinforcing layer 14 is located on the outer side of the tire from half the thickness of the tire frame member 12 (the position of the line H).
- the outer surface 14 ⁇ / b> B of the reinforcing layer 14 is located on the outer surface side of the tire frame member 12.
- the reinforcing layer 14 may be exposed on the outer surface of the tire frame member 12.
- the position of the outer surface 14B of the reinforcing layer 14 is not limited to these.
- the outer surface 14 ⁇ / b> B may be half the thickness of the tire frame member 12 (the position of the line H), or may be positioned on the inner side of the tire.
- This embodiment is a resin having at least a bead portion 16, a side portion 18 connected to the outside in the tire radial direction of the bead portion, and a crown portion 26 connected to the inside of the side portion in the tire width direction and where the tread is disposed.
- a tire skeleton member 12 made of an organic fiber is coated with a resin material, and the reinforcing layer 14 extends from the bead portion 16 to the side portion 18 and is arranged side by side in the tire circumferential direction. The operation will be described below.
- the reinforcing layer 14 is present on the tire frame member 12, preferably on the side portion 18. That is, the presence of the reinforcing layer 14 extending from the bead portion to the side portion in the tire frame member 12 can reduce the propagation speed of scratches in the tire frame member 12. Further, since the reinforcing layers 14 are arranged in the tire circumferential direction and are not integrally formed in the tire circumferential direction, the rigidity in the tire circumferential direction does not become too high, and the rigidity in the tire radial direction is Balance is good. For this reason, it is possible to improve the cut resistance while considering the balance between the rigidity in the tire circumferential direction and the rigidity in the tire radial direction.
- the outer surface 14 ⁇ / b> B of the reinforcing layer 14 is located on the outer side of the tire from half the thickness of the tire frame member 12. That is, since the outer surface 14B of the reinforcing layer 14 is located on the outer surface side of the tire frame member 12, durability against bending deformation of the tire is improved. Further, since the inner end 14A in the tire radial direction of the reinforcing layer 14 is located on the inner side in the tire radial direction from the rim separation point P of the bead portion 16, for example, pinch cut at the time of riding on a curb or the like can be suppressed. .
- the reinforcing layer 14 is locked and wound around the bead core 22 embedded in the bead portion 16, the reinforcing layer 14 can bear much of the tension generated in the tire. For this reason, the tolerance with respect to an internal pressure improves markedly. Thereby, since the thickness of the tire frame member 12 can be reduced, riding comfort can be improved.
- the organic fiber of the reinforcing layer 14 disposed on the side portion is configured by two layers of the cord member and the adhesive layer (RF layer), so that the organic fiber is not only the reinforcing layer 14 but also the tire frame member. 12 can be strongly bonded.
- the reinforcing layers 14 adjacent to each other in the tire circumferential direction are in contact with each other.
- the reinforcing layer 14 is in contact with at least a portion including the tire maximum width position.
- the contact includes a case where the end surfaces of the reinforcing layer 14 abut each other in the tire circumferential direction and a case where the end surfaces overlap each other in the tire radial direction.
- the reinforcing layer 14 is formed with a wide portion 14W on the outer side in the tire radial direction and a narrow portion 14S on the inner side in the tire radial direction.
- the wide portion 14W includes the tire maximum width position of the side portion 18.
- the wide portions 14W are in contact with each other.
- the narrow portions 14S are separated from each other in the tire circumferential direction.
- the boundary 14D between the wide portion 14W and the narrow portion 14S is located slightly inside the tire radial direction from the tire maximum width position.
- the position of the boundary 14D is not limited to this, and may be further located on the inner side in the tire radial direction as shown in FIG. That is, in the example shown in FIG. 6, the boundary 14 ⁇ / b> D is located on the inner side in the tire radial direction than the rim separation point P of the bead portion 16.
- the reinforcing layers 14 are arranged so as to be in contact with each other in the tire circumferential direction, the cut resistance can be further improved.
- another reinforcing layer (not shown) may be disposed between the reinforcing layers 14 adjacent in the tire circumferential direction.
- another reinforcing layer and the reinforcing layer 14 may be partially overlapped.
- one side of the other reinforcing layer in the tire circumferential direction is partially overlapped with the adjacent reinforcing layer 14, and the other side of the tire circumferential direction is not overlapped with the adjacent reinforcing layer 14, and a clearance of, for example, 0.1 mm or more is provided. May be.
- the reinforcing layers 14 adjacent in the tire circumferential direction may partially overlap each other.
- the inner end 14A in the tire radial direction of the reinforcing layer 14 may be formed narrow, and the inner end 14A in the tire radial direction may be wound around the bead core 22 and folded back. Thereby, wrinkles can be prevented from occurring in the reinforcing layer 14 due to the curvature of the bead core 22.
- the tire radial direction inner end 14A of the reinforcing layer 14 may be fastened to the side of the bead core 22 by adhesion or the like. In this case, it is desirable that the bead core 22 has a polygonal cross section. Further, as shown in FIG. 8B, the inner end 14 ⁇ / b> A in the tire radial direction of the reinforcing layer 14 may be separated from the bead core 22. In this case, it is desirable that the inner end 14 ⁇ / b> A in the tire radial direction of the reinforcing layer 14 is located on the inner side in the tire radial direction with respect to the rim separation point P of the bead portion 16.
- the inner end 14 ⁇ / b> A in the tire radial direction of the reinforcing layer 14 may be sandwiched between the two bead cores 22.
- the tire 110 includes a tire frame member 112 and a reinforcing layer 114.
- the tire frame member 112 is made of resin, and includes a bead portion 116, a side portion 118 that is continuous with the bead portion 116 on the outer side in the tire radial direction, and a side portion 118 that is continuous with the inner side in the tire width direction. And a crown portion 126.
- the bead portion 116 means from the tire radial direction inner end of the tire frame member 112 to 30% of the tire cross-section height.
- the tire frame member 112 has an annular shape around the tire axis.
- the resin material constituting the tire frame member 112 include engineering plastics (including super engineering plastics), as well as thermoplastic resins (including thermoplastic elastomers), thermosetting resins, and other general-purpose resins.
- the resin material here does not include vulcanized rubber.
- thermoplastic resin referred to herein refers to the same polymer compound as defined in the first embodiment, and the thermoplastic resin (including the thermoplastic elastomer) Examples thereof include the same resins as those mentioned in the first embodiment. Furthermore, as the thermoplastic resin, for example, those having the same deflection temperature under load, tensile yield strength, tensile breaking elongation and Vicat softening temperature as those mentioned in the first embodiment can be used.
- the thermosetting resin refers to the same polymer compound as defined in the first embodiment, and the thermosetting resin is the same resin as the resin described in the first embodiment. Etc. Further, other resin materials that can be used are the same as those mentioned in the first embodiment.
- An annular bead core 122 in which a cord 120 is coated with a resin is embedded in the bead portion 116.
- Steel, organic fiber, resin, etc. can be used for the material of the cord 120.
- the bead core 122 is, for example, a strand bead formed by stacking a plurality of resin-coated (for example, three) cords 120 while winding them in the tire circumferential direction. In the cross section of the strand bead in the tire width direction, a plurality of cords 120 are lined with resin coating.
- the cord 120 is stacked in, for example, three layers.
- the stacking direction of the cord 120 may be the tire radial direction as shown in FIGS. 11A to 11F and FIGS. 12A to 12D, and may be the tire width direction as shown in FIG. 13D.
- Direction may be used.
- the bead core 122 is a monostrand bead formed by stacking one resin-coated cord 120 in the tire circumferential direction while being wound in the tire circumferential direction. Also good. Further, the number of stacks is not limited to three layers. Furthermore, the formation method of the bead core 122 is not particularly limited as long as the cord 120 is resin-coated, and may not be a strand bead.
- the resin material for covering the cord 120 is preferably an olefin-based, ester-based, amide-based, or urethane-based TPE, or TPV in which a rubber-based resin is partially kneaded.
- these thermoplastic materials for example, the deflection temperature under load specified at ISO 75-2 or ASTM D648 (at the time of 0.45 MPa load) is 75 ° C. or higher, and the tensile yield elongation similarly specified by JIS K7113 is 10% or higher.
- the tensile fracture elongation specified in JIS K7113 is 50% or more and the Vicat softening temperature (Method A) specified in JIS K7113 is 130 ° C. or more.
- a crown portion 126 is connected to the outer side of the side portion 118 in the tire radial direction.
- a belt layer 128 is provided on the outer periphery of the crown portion 126.
- the belt layer 128 is formed by, for example, winding a resin-coated cord spirally in the tire circumferential direction.
- a tread 132 is provided outside the crown portion 126 and the belt layer 128 in the tire radial direction.
- the tread 132 is made of rubber having higher wear resistance than the resin material forming the tire frame member 112.
- SBR styrene-butadiene rubber
- the tread 132 may be made of another type of resin material that is more excellent in wear resistance than the resin material forming the tire frame member 112.
- the reinforcing layer 114 is obtained by coating the organic fiber 130 with a resin material, and is thermally welded to the bead core 122.
- the thermal welding is to melt and join the resin material of the reinforcing layer 114 and the resin material of the bead core 122 by heat.
- a reinforcement layer 114 is thermally welded to the bead core 122.
- the same resin material as that constituting the tire frame member 112 is used.
- the coating with the resin material may be on one side or both sides of the organic fiber 130.
- both surfaces of the organic fiber 130 are covered with a resin material, the organic fiber 130 can be arranged in the center of the reinforcing layer 114 in the thickness direction.
- different resin materials may be used for one surface and the other surface.
- the organic fiber 130 is composed of two layers: a cord member containing a nylon fiber material and an adhesive layer formed on the cord member and formed of an RF composition containing resorcinol-formaldehyde resin.
- the organic fiber 130 extends at least along the tire radial direction.
- the organic fibers 130 may be combined with the organic fibers 130 extending in the tire circumferential direction so that the organic fibers 130 cross each other.
- the organic fiber 130 may be woven or knitted to form a cloth shape.
- the organic fiber 130 may be inclined with respect to the tire radial direction or the tire circumferential direction.
- the bead core 122 shown in FIGS. 11A to 11F, 12A to 12D, 13A, and 13B is a three-layer strand bead stacked in the tire radial direction.
- the bead core 122 shown in FIG. 13D is a three-layer strand bead stacked in the tire width direction.
- the bead core 122 shown in FIG. 13C is a monostrand bead stacked in three layers in the tire radial direction and the tire width direction.
- the reinforcing layer 114 is joined to a part of the outer surface 122 ⁇ / b> A in the tire width direction of the bead core 122. This part is a layer located on the outermost side in the tire radial direction among the three layers constituting the bead core 122.
- the reinforcing layer 114 is entirely bonded to the outer surface 122 ⁇ / b> A in the tire width direction of the bead core 122.
- FIG. 11A the reinforcing layer 114 is joined to a part of the outer surface 122 ⁇ / b> A in the tire width direction of the bead core 122.
- the reinforcing layer 114 is bent into a substantially L shape along the tire width direction outer side surface 122A and the tire radial direction inner side surface 122B of the bead core 122, and the tire radius is increased from the tire width direction outer side surface 122A.
- the inner side surface 122B is joined to the center in the tire width direction.
- the reinforcing layer 114 is entirely bonded from the outer side surface 122A in the tire width direction of the bead core 122 to the inner side surface 122B in the tire radial direction.
- FIG. 11C the reinforcing layer 114 is bent into a substantially L shape along the tire width direction outer side surface 122A and the tire radial direction inner side surface 122B of the bead core 122, and the tire radius is increased from the tire width direction outer side surface 122A.
- the inner side surface 122B is joined to the center in the tire width direction.
- the reinforcing layer 114 is entirely bonded from the outer side surface 122A in
- the reinforcing layer 114 is bent into a substantially U shape along the tire width direction outer side surface 122A, the tire radial direction inner side surface 122B, and the tire width direction inner side surface 122C of the bead core 122.
- the entire outer surface 122A is joined to the inner surface 122B in the tire radial direction and the inner side surface 122C in the tire width direction.
- the reinforcing layer 114 surrounds the bead core 122.
- the reinforcing layer 114 is bent so as to surround the bead core 122, and is entirely bonded to the tire width direction outer side surface 122A, the tire radial direction inner side surface 122B, the tire width direction inner side surface 122C, and the tire radial direction outer side surface 122D. ing.
- the reinforcing layer 114 is entirely bonded to the tire radial direction outer side surface 122D of the bead core 122.
- the reinforcing layer 114 is bent in a substantially L shape along the tire radial direction outer side surface 122D and the tire width direction inner side surface 122C of the bead core 122, and the tire width from the tire radial direction outer side surface 122D.
- the entire inner side surface 122C is joined to each other.
- FIG. 12A the reinforcing layer 114 is entirely bonded to the tire radial direction outer side surface 122D of the bead core 122.
- the reinforcing layer 114 is bent in a substantially U shape along the tire radial direction outer side surface 122D, the tire width direction inner side surface 122C, and the tire radial direction inner side surface 122B. The entire surface is joined from 122D to the inner surface 122C in the tire width direction and the inner surface 122B in the tire radial direction.
- the reinforcing layer 114 surrounds the bead core 122.
- the reinforcing layer 114 is bent so as to surround the bead core 122, and is entirely bonded to the tire radial direction outer side surface 122D, the tire width direction inner side surface 122C, the tire radial direction inner side surface 122B, and the tire width direction outer side surface 122A. ing.
- the end 114A on the bead core side of the reinforcing layer 114 is located around the bead core 122.
- This end 114 ⁇ / b> A is thermally welded to the bead core 122.
- the end 114 ⁇ / b> A only needs to be positioned around the bead core 122, and may not necessarily be thermally welded to the bead core 122.
- the end 114A of the reinforcing layer 114 on the bead core 122 side is located between the cords 120 of the bead core 122. This can be realized by sandwiching the end 114 ⁇ / b> A of the reinforcing layer 114 between the cords 120 when the bead core 122 is manufactured by stacking the cords 120 while being wound in the tire circumferential direction.
- the end 114A of the reinforcing layer 114 is located between the layer positioned most radially outward of the three layers constituting the bead core 122 and the layer positioned centrally in the tire radial direction. ing.
- FIG. 13A the end 114A of the reinforcing layer 114 on the bead core 122 side is located between the cords 120 of the bead core 122. This can be realized by sandwiching the end 114 ⁇ / b> A of the reinforcing layer 114 between the cords 120 when the bead core 122 is manufactured by stacking the cords 120 while
- the end 114A of the reinforcing layer 114 is located between the layer located most inside in the tire radial direction among the three layers constituting the bead core 122 and the layer located in the center in the tire radial direction.
- the bead core 122 is a monostrand bead
- the end 114A of the reinforcing layer 114 is positioned between three pairs of cords 120 adjacent in the tire width direction.
- the three layers constituting the bead core 122 are located between the layer located most on the outer side in the tire width direction and the layer located on the center in the tire width direction.
- the bead core 122 is a strand bead stacked in the tire width direction.
- the end 114A of the reinforcing layer 114 is in a state of entering between the cords 120 of the bead core 122 from the outer side in the tire radial direction toward the inner side.
- the reinforcing layer 114 is wound around the bead core 122 in the direction of the arrow A, for example, It may be integrated with 122 by thermal welding.
- the reinforcing layer 114 is joined to the entire surface of the bead core 122 in the tire width direction outer side surface 122A, the tire radial direction inner side surface 122B, and the tire width direction inner side surface 122C, and a part of the tire radial direction outer side surface 122D.
- 114A is located between the cords 120.
- the reinforcing layer 114 is heat-welded to the bead core 122 and integrated.
- the end 114A of the reinforcing layer 114 is located between the cords 120 of the bead core 122 (FIGS. 13A to 13D, FIGS. 14A and 14B)
- the reinforcing layer 114 is integrated with the bead core 122 when the bead core 122 is manufactured.
- the manufacturing process of the tire 110 will be briefly described.
- the integrated bead core 122 and the reinforcing layer 114 are arranged in a mold (not shown), and a resin material is supplied to the cavity in the mold, thereby making the resin as shown in FIG. 10B.
- the tire frame member 112 is formed integrally with the bead core 122 and the reinforcing layer 114.
- the reinforcing layer 114 is located on the outer surface of the tire frame member 112 from the side portion 118 to the crown portion 126.
- the belt layer 128 described above is provided on the outer periphery of the crown portion 126 of the tire frame member 112. Then, as shown in FIG.
- a rubber layer 134 is formed outside the side portion 118 of the tire frame member 112 and around the bead portion 116, and a tread 132 is vulcanized and formed outside the belt layer 128 in the tire radial direction. .
- the tire 110 according to the present embodiment is obtained.
- the reinforcing layer 114 extends from the bead portion 116 to the side portion 118 and is arranged side by side in the tire circumferential direction. At this time, the reinforcing layers 114 adjacent in the tire circumferential direction may be arranged in close contact with each other, or may be arranged at intervals in the tire circumferential direction.
- the outer end 114 ⁇ / b> C in the tire radial direction of the reinforcing layer 114 extends to the crown portion 126 of the tire frame member 112 and overlaps with the belt layer 128.
- the amount of overlap with the belt layer 128 is preferably 5 mm or more from the end of the belt layer 128 in the tire width direction to the center in the tire width direction.
- the reinforcing layer 114 may extend to the center in the tire width direction. It should be noted that the position of the outer end 114C in the tire radial direction of the reinforcing layer 114 may end near the tire maximum width position in the side portion 118, or end before the crown portion 126 (so-called buttress portion). May be.
- a resin tire skeleton member having at least a bead portion in which a bead core with a resin-coated cord is embedded, and a side portion connected to the outside in the tire radial direction of the bead portion, and an organic fiber made of a resin material A reinforcing layer that is coated and thermally welded to the bead core and extends from the bead portion to the side portion.
- the reinforcing layer 114 is provided from the outer surface of the tire frame member 112, specifically, from the bead part 116 to the side part 118 and further to the crown part 126, so that the tire frame member The wound propagation speed at 112 can be reduced. Thereby, the cut-proof performance of the tire 110 can be improved. Further, since the reinforcing layers 114 are arranged in the tire circumferential direction and are not integrally formed in the tire circumferential direction, the rigidity in the tire circumferential direction does not become too high, and the rigidity in the tire radial direction is Balance is good.
- the outer surface of the reinforcing layer 114 is located on the outer surface of the tire frame member 112, durability against bending deformation of the tire 110 is improved. Since the reinforcing layer 114 is joined to the bead core 122, the reinforcing layer 114 can bear the tension generated in the tire 110. For this reason, the tolerance (pressure resistance) with respect to an internal pressure can be improved. Moreover, since the thickness of the tire frame member 112 can be reduced by this, riding comfort can be improved.
- the bead core 122 is obtained by coating the cord 120 with resin, and the reinforcing layer 114 is thermally welded to the bead core 122. Therefore, the reinforcing layer 114 is attached to the bead core 122. It is not necessary to provide such a bonding layer as compared with the case of bonding to the substrate.
- the end 114A of the reinforcing layer 114 on the bead core 122 side is located around the bead core 122. Therefore, as compared with the structure in which the end 114A is folded back by the bead core 122, the manufacturing process is simplified, and the length of the members constituting the reinforcing layer 114 can be shortened. For this reason, the tire frame member 112 can be both reinforced and simplified, and the tire 110 can be reduced in weight.
- the end 114A of the reinforcing layer 114 on the bead core 122 side is located between the cords 120 of the bead core 122.
- the bead core is a strand bead.
- the reinforcement layer 114 and the bead core 122 can be more firmly joined, so that the pressure resistance of the tire 110 can be further improved.
- the organic fiber of the reinforcing layer 114 disposed on the side portion is composed of two layers of the cord member and the adhesive layer, so that the organic fiber is strongly bonded not only to the reinforcing layer 114 but also to the tire frame member 112. It becomes possible to make it.
- the reinforcing layer 114 extending from the bead portion 116 to the side portion 118 can achieve both pressure resistance and cut resistance while reducing the weight of the tire 110. .
- the reinforcing layer 114 is arranged side by side in the tire circumferential direction, but the reinforcing layer 114 may be integrally formed. Further, the reinforcing layers 114 adjacent in the tire circumferential direction may be partially overlapped with each other. Further, another reinforcing layer (not shown) may be disposed between the reinforcing layers 114 adjacent in the tire circumferential direction. In this case, another reinforcing layer and the reinforcing layer 114 may be partially overlapped.
- one side of the other reinforcing layer in the tire circumferential direction is partially overlapped with the adjacent reinforcing layer 114, and the other side of the tire circumferential direction is not overlapped with the adjacent reinforcing layer 114.
- a clearance of 0.1 mm or more is provided. May be.
- the present invention will be further described with reference to examples, but the present invention is not limited to the following examples.
- the process of forming an adhesive layer (RF layer) on the cord member is referred to as an RF process
- the process of covering with a resin is referred to as a resin coating process.
- ⁇ Cord member> ⁇ Nylon fiber>
- RF composition An RF composition for forming an adhesive layer was prepared with the formulation shown in the following conditions. ⁇ conditions> -Sodium hydroxide solution (10 mass% aqueous solution) (manufactured by Tosoh Corporation): 33.3 parts by mass- Formaldehyde (37 mass% aqueous solution) (Isoban, Nippon Kasei Chemical): 34.8 mass parts- Resorcinol (Sumitomo Chemical Co., Ltd.) Manufactured): 27.1 parts by mass, water: 904.8 parts by mass
- Example 1 An organic fiber in which the cord member and the RF adhesive layer are laminated by impregnating and applying the RF composition prepared above to the cord member, drying at 160 ° C. for 80 seconds and baking at 170 ° C. for 60 seconds. Got.
- ⁇ Resin coating treatment> The organic fiber is placed in a general laminator (coating device), and a polyamide thermoplastic elastomer (polyamide 12 resin, “UBESTA, XPA9055” manufactured by Ube Industries, Ltd.), which is a resin material, has a die temperature of 245 when the resin is extruded.
- a laminate plate of 13 cm (width) ⁇ 100 mm (length) ⁇ 0.8 mm (thickness) was prepared by coating on the organic fiber under the conditions of °C and laminator press temperature of 230 ° C.
- the test piece 1 has a form including 100 organic fibers that are driven in at a 1 mm interval only in one horizontal row.
- Comparative Example 1 As Comparative Example 1, a cord member formed of nylon fiber (nylon 66) is directly installed in the coating apparatus without RF treatment, and a resin coating treatment is performed in the same manner as in Example 1 to produce a laminate plate. This was designated as test piece 2.
- the organic fiber has a structure including a cord member including an nylon fiber material and an RF layer, and is coated with a resin material, thereby obtaining a reinforcing layer in which the cord member and the resin material are sufficiently bonded. It was shown that.
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Abstract
Description
これに関し、有機繊維とゴムとを接着する技術としては、例えば、繊維をエポキシ系化合物やイソシアネート系化合物によって接着する技術がある(例えば特開2004-339299号公報及び国際公開第2014/074404号)。また、ゴムと繊維とを接着する場合には、レゾルシノール-ホルムアルデヒド-ラテックス樹脂を用いた接着方法が知られている(例えば特開2001-73247号公報)。
一方、補強層に用いるコード部材を樹脂材料で被覆する場合、樹脂材料とコード部材との接着については、改善の余地が未だ十分にある。
本開示のタイヤは、ビード部及び前記ビード部のタイヤ半径方向外側に連なるサイド部を有する樹脂製のタイヤ骨格部材と、有機繊維及び前記有機繊維を被覆する樹脂材料を含む補強層と、を備え、前記有機繊維が、ナイロン系繊維材料を含むコード部材と、前記コード部材上に設けられレゾルシノール-ホルムアルデヒド樹脂を含む組成物で形成された接着層(以下、適宜「RF層」と称することがある)と、を有する。
前記のように補強層中のコード部材を含む有機繊維は、特定のコード部材及びRF層の2構成要素を有するものとし、かつそれぞれの構成要素間を接着させることで、前記有機繊維が前記補強層中の樹脂材料に被覆された場合に、前記有機繊維が前記補強層中の樹脂材料と強く接着して固定される。また、補強層がタイヤ骨格部材の内部又は表面に接して配置される場合、補強層が樹脂材料を用いて形成されているため、ゴムを用いた場合に比して補強層とタイヤ骨格部材との接着力を高めることができる。
明細書等において、数値範囲を表す「~」はその上限及び下限の数値を含む範囲を表す。
以下に、本発明の一例について詳細に説明する。
本開示における補強層とは、有機繊維と、前記有機繊維を被覆する樹脂材料と、を含む。また、補強層は本開示のタイヤ、好ましくはタイヤ骨格部材を補強する層であり、タイヤ、好ましくはタイヤ骨格部材を補強可能な位置であれば補強層の配置は特に限定されないが、好ましくはタイヤ骨格部材に配置され、より好ましくはタイヤ骨格部材のサイド部に配置される。ここで、補強層がタイヤ骨格部材に配置されている態様としては、補強層がタイヤ骨格部材自体の内部に備えられている態様の他、タイヤ骨格部材の内表面又は外表面に設置されている態様を含む。また、補強層は、タイヤ骨格部材と離れて配置されている態様であってもよく、例えば、タイヤ骨格部材と補強層との間に他の層が存在する態様であってもよい。
補強層は、上述のように、有機繊維と、前記有機繊維を被覆する樹脂材料を含んで形成されている。ここで、有機繊維は樹脂材料で完全に被覆されていてもよいし、補強層において有機繊維が樹脂材料に被覆されていない箇所を有していてもよい。また、補強層は、例えば、タイヤのビード部からサイド部に延びると共にタイヤ周方向に間隔を空けて並べて配置される層とすることもできる。
補強層の厚さとしては、有機繊維の材質、太さ等、目的に応じて適宜調整されることが好ましい。
以下、補強層について、図1を用いて、その構造についての具体例を示し、それぞれの部材及び層について説明する。
本開示における有機繊維は、ナイロン系繊維材料を含むコード部材(以下コード部材という)と、前記コード部材上に設けられレゾルシノール-ホルムアルデヒド樹脂を含む組成物で形成された接着層と、を有する。なお、接着層はコード部材の表面すべてを覆うように設けられていることが好ましいが、本発明の効果を損なわない範囲で、表面の一部分においてコード部材の表面を覆っていない領域を有していてもよい。また、接着層は少なくとも一部がコード部材の表面と直に接するよう設けられていることが好ましく、接着層のコード部材に相対する側の面のすべてがコード部材の表面と直に接するよう設けられていることがより好ましい。
本開示における有機繊維を構成するコード部材は、複数のモノフィラメントを撚り合わせた1本のマルチフィラメントの1本単体を片撚りしたもの、または、前記マルチフィラメントの2本以上を撚り合わせたものであることが好ましい。また、目的に応じて、例えばマルチフィラメント1本のみを用いたり、マルチフィラメントを用いずにモノフィラメントのみを用いたりしてもよい。ここで複数とは、10本以上のことをいう。
前記コード部材としては、例えば、ナイロン系繊維材料からなるマルチフィラメントを用いることができる。
前記有機繊維の構造について、図1A、図1B及び図1Cを用いて具体的に説明する。図1Aは、本開示における有機繊維を構成するコード部材1を説明するための概略図である。図1Aに示すコード部材1は、所定本数のモノフィラメントfを集合し、これに所定数の撚りをかけて形成されたマルチフィラメントMの2本を撚り合わせて形成したものである。ここで、集合させるモノフィラメントfの本数や撚り数、集合させるマルチフィラメントMの本数や撚り、材質等を考慮して適宜調整することが出来る。
有機繊維4において、コード部材1とRF層3との間は、各層を形成する材料同士が接着している。本開示における有機繊維4は、後述するように樹脂材料に一部又は全部を被覆させることで、本開示における補強層として用いることができる。
図1Cに示すように、RF層3は、コード部材1上に設けられ、コード部材1の表面を覆っている。RF層3は、一方の面でコード部材1上に接着されていればよい。RF層3は、コード部材1の表面すべてを覆うように接着して設けられていることが好ましいが、本発明の効果を損なわない範囲で、表面の一部分においてコード部材1の表面と接着していない領域を有していてもよい。上述のように、RF層3の外周面は、補強層を形成するために樹脂材料で有機繊維4を被覆する際、樹脂材料によって覆われ当該樹脂材料と接着する。
ナイロン系繊維材料は、ラクタムの開環重縮合や、ジアミンと二塩基酸との重縮合等の公知の方法によって合成することができる。
ただし、コード部材がナイロン系繊維材料以外の他の繊維材料を含む場合、コード部材の表面(その上にRF層が設けられる面)を構成する繊維材料としてナイロン系繊維材料を含むことが好ましい。コード部材の表面を構成する繊維材料のうち、ナイロン系繊維材料が占める比率(面積比)は、50%以上であることが好ましく、75%以上であることがより好ましく、100%であることが特に好ましい。
接着層(RF層)とは、コード部材上に設けられる層であり、レゾルシノール-ホルムアルデヒド樹脂を含む組成物(以下、適宜「RF組成物」と称することがある)で形成された層である。「レゾルシノール-ホルムアルデヒド樹脂を含む組成物で形成された層」は、RF組成物に含まれるレゾルシノール-ホルムアルデヒド樹脂を反応させて形成した層である。
RF層を形成するレゾルシノール-ホルムアルデヒド樹脂(以下、レゾルシノール-ホルムアルデヒド縮合体ともいう)は、レゾルシノールを少なくとも一部に含むフェノール類化合物と、ホルムアルデヒドとが縮合して得られた化合物である。
レゾルシノール-ホルムアルデヒド縮合体は、分岐などの少ないレゾール型(一般的な接着剤用フェノール樹脂の形態)であるのが好ましい。また、メチロール基及びジメチレンエーテル結合(ジベンジルエーテル結合)が残留せず、それ自身では、加熱を受けても縮合反応がほとんど進行しないもの、すなわち安定性が高いものが好ましい。例えば、フェノール類化合物間の結合部位総数におけるメチレン結合の比率を、好ましくは90%以上、より好ましくは95%以上、さらに好ましくは97%以上とすることが可能である。すなわち、数個のフェノール類化合物分子がほぼメチレン結合のみによりほぼ直鎖状に結合したものなどが好ましいと考えられる。
またレゾルシノール-ホルムアルデヒド縮合体は、ホルムアルデヒド由来の部分により結合されるフェノール類化合物の一部または全部がレゾルシノールである。また、レゾルシノール-ホルムアルデヒド縮合体は、特開2014-001270号公報に挙げられるように、改質されたものであってもよい。
また、任意のアニオン系界面活性剤を用いて、ボールミル、サンドミルによって中性の水に分散させて使用することも可能である。この場合、接着力を有効に発現させるために、界面活性剤の量を分散状態が悪くならない程度に少量にすることが好ましい。
RF層に含まれるにレゾルシノール-ホルムアルデヒド樹脂の含有量は特に限定されるものではないが、固形分換算で、2質量%以上20質量%以下が好ましく、さらに好ましくは3質量%以上10質量%以下である。
樹脂材料は、前記補強層中に含まれ、前記有機繊維を被覆する材料である。また、樹脂材料は、従来の天然ゴムや合成ゴム等の加硫ゴムは含まないことを意味する。
樹脂材料としては、熱可塑性樹脂及び熱硬化性樹脂のいずれも用いることができる。ここで、熱可塑性樹脂(熱可塑性エラストマーを含む)とは、温度上昇と共に材料が軟化、流動し、冷却すると比較的硬く強度のある状態になる高分子化合物をいう。本明細書では、このうち、温度上昇と共に材料が軟化、流動し、冷却すると比較的硬く強度のある状態になり、かつ、ゴム状弾性を有する高分子化合物を熱可塑性エラストマーとし、温度上昇と共に材料が軟化、流動し、冷却すると比較的硬く強度のある状態になり、かつ、ゴム状弾性を有しない高分子化合物をエラストマーでない熱可塑性樹脂として区別する。
また、熱硬化性樹脂とは、温度上昇と共に3次元的網目構造を形成し、硬化する高分子化合物をいう。
熱可塑性樹脂としては、例えば、ポリウレタン系樹脂、ポリオレフィン系樹脂、ポリ塩化ビニル系樹脂及びポリアミド系樹脂等が挙げられる。さらに、熱可塑性樹脂としては、ポリオレフィン系熱可塑性エラストマー(TPO)、ポリスチレン系熱可塑性エラストマー(TPS)、ポリアミド系熱可塑性エラストマー(TPA)、ポリウレタン系熱可塑性エラストマー(TPU)、ポリエステル系熱可塑性エラストマー(TPC)、及び、動的架橋型熱可塑性エラストマー(TPV)が挙げられる。
これらの中でも、前記有機繊維との接着性から、熱可塑性樹脂を用いることが好ましく、ポリアミド系熱可塑性樹脂又はポリウレタン系熱可塑性樹脂を用いることが更に好ましく、ポリアミド系熱可塑性エラストマー(TPA)を用いることが特に好ましい。
補強層は、本開示のタイヤにおいて、有機繊維及び前記有機繊維を被覆する樹脂材料を含む。補強層は、好ましくはタイヤ骨格部材に配置され、より好ましくはタイヤ骨格部材のサイド部に配置される。例えば、前記タイヤ骨格部材に配置された補強層は、以下の工程、すなわち、
(1)ナイロン系繊維材料を含むコード部材の表面に、レゾルシノール-ホルムアルデヒド樹脂を含むRF組成物を付与した後に、160℃~180℃に加熱して接着層(RF層)を形成することで有機繊維を得るRF処理工程と、
(2)前記RF処理工程の後、タイヤ骨格部材上に複数の前記有機繊維を所望の間隔で並置し、前記有機繊維が並置された前記接着層(RF層)の表面に樹脂材料を付与した後に加熱して補強層を形成する樹脂コーテイング処理工程と、を有する工程によって製造することができる。
RF処理工程では、RF層とコード部材との接着性をさらに高める観点から、RF組成物の塗膜を乾燥する乾燥工程を設け、さらにその後にRF組成物の塗膜をベーキングするベーキング工程を設けてもよい。乾燥工程を設けることによって、RF組成物中の溶剤を十分に除去し、次のベーキング工程を効率よく行うことができる。RF処理工程において、乾燥工程とベーキング工程とをおこなう場合、両工程において加熱温度が160℃~180℃の範囲内であることが好ましい。前記乾燥工程では、例えば、160℃~180℃で70秒間~90秒間乾燥させることが好ましい。また、ベーキング工程では、例えば、160℃~170℃で50秒間~70秒間ベーキングさせることが好ましい。
RF組成物の付与方法としては、塗布、浸漬、押出成型等の公知の方法を適宜用いることができる。例えば、前記コード部材をRF組成物に含浸させて、前記のように乾燥後にベーキングすることで、効率よくRF層を形成することができる。
続いて本開示のタイヤの具体的な実施形態について図を用いて説明するが、本開示のタイヤは以下の実施形態に限定されない。図2において、本実施形態に係るタイヤ10は、タイヤ骨格部材12と、補強層14とを備えている。
第1実施形態で用いられる樹脂としては、熱可塑性樹脂(熱可塑性エラストマーを含む)及び熱硬化性樹脂が挙げられ、その定義は上述と同様である。
本実施形態は、少なくとも、ビード部16と、該ビード部のタイヤ半径方向外側に連なるサイド部18と、該サイド部のタイヤ幅方向内側に連なり、トレッドが配置されるクラウン部26とを有する樹脂製のタイヤ骨格部材12と、有機繊維が樹脂材料により被覆され、前記ビード部16から前記サイド部18に延びると共にタイヤ周方向に並べて配置された補強層14と、を備えている。以下、その作用について説明する。
更に、補強層14のタイヤ半径方向内側端14Aが、ビード部16のリム離反点Pよりもタイヤ半径方向内側に位置しているので、例えば縁石等の乗り上げ時におけるピンチカットを抑制することができる。
また、補強層14がビード部16に埋設されたビードコア22に係止され、かつ巻き付けられているので、タイヤに生ずる張力の多くを該補強層14が負担することができる。このため、内圧に対する耐性が格段に向上する。このことにより、タイヤ骨格部材12の厚みを薄くできるので、乗り心地性を向上させることができる。
また、タイヤ10において、サイド部に配置された補強層14の有機繊維を、コード部材及び接着層(RF層)の二層で構成することで、有機繊維を補強層14のみならずタイヤ骨格部材12とも強く接着させることが可能となる。
図4及び図5において、本実施形態に係るタイヤ20では、タイヤ周方向に隣り合う補強層14が互いに当接している。この補強層14は、少なくともタイヤ最大幅位置を含む部分で当接している。当接には、補強層14の端面同士がタイヤ周方向に突き当たっている場合と、タイヤ半径方向に重なっている場合を含む。
第1実施形態において、タイヤ周方向に隣り合う補強層14の間に、他の補強層(図示せず)を配置してもよい。この場合、他の補強層と補強層14とを部分的に重ねてもよい。また、他の補強層のタイヤ周方向一方側を隣接する補強層14と部分的に重ね、タイヤ周方向他方側を隣接する補強層14と重ねず、例えば0.1mm以上の隙間を設けるようにしてもよい。また、第2実施形態において、タイヤ周方向に隣り合う補強層14を互いに部分的に重ねてもよい。
図9において、本実施形態に係るタイヤ110は、タイヤ骨格部材112と、補強層114とを備えている。
また、熱硬化性樹脂とは、前記第1実施形態で定義したものと同様の高分子化合物をさし、前記熱硬化性樹脂としては、前記第1実施形態で挙げた樹脂等と同様の樹脂等が挙げられる。さらに、その他に用いることができる樹脂材料も、前記第1実施形態で挙げたものと同様である。
図11Bに示される例では、補強層114は、ビードコア122のタイヤ幅方向外側面122Aに全面的に接合されている。
図11Cに示される例では、補強層114は、ビードコア122のタイヤ幅方向外側面122A及びタイヤ半径方向内側面122Bに沿うように略L字形に折り曲げられ、該タイヤ幅方向外側面122Aからタイヤ半径方向内側面122Bのタイヤ幅方向中央に渡って接合されている。
図11Dに示される例では、補強層114は、ビードコア122のタイヤ幅方向外側面122Aからタイヤ半径方向内側面122Bに渡って、それぞれ全面的に接合されている。
図11Eに示される例では、補強層114は、ビードコア122のタイヤ幅方向外側面122A、タイヤ半径方向内側面122B及びタイヤ幅方向内側面122Cに沿うように略U字形に折り曲げられ、該タイヤ幅方向外側面122Aから、タイヤ半径方向内側面122B、タイヤ幅方向内側面122Cに渡って、それぞれ全面的に接合されている。
図11Fに示される例では、補強層114は、ビードコア122の周囲を囲んでいる。この補強層114は、ビードコア122を囲むように折り曲げられ、タイヤ幅方向外側面122A、タイヤ半径方向内側面122B、タイヤ幅方向内側面122C及びタイヤ半径方向外側面122Dに、それぞれ全面的に接合されている。
図12Bに示される例では、補強層114は、ビードコア122のタイヤ半径方向外側面122D及びタイヤ幅方向内側面122Cに沿うように略L字形に折り曲げられ、該タイヤ半径方向外側面122Dからタイヤ幅方向内側面122Cに渡って、それぞれ全面的に接合されている。
図12Cに示される例では、補強層114は、タイヤ半径方向外側面122D、タイヤ幅方向内側面122C及びタイヤ半径方向内側面122Bに沿うように略U字形に折り曲げられ、該タイヤ半径方向外側面122Dから、タイヤ幅方向内側面122C、タイヤ半径方向内側面122Bに渡って、それぞれ全面的に接合されている。
図12Dに示される例では、補強層114は、ビードコア122の周囲を囲んでいる。この補強層114は、ビードコア122を囲むように折り曲げられ、タイヤ半径方向外側面122D、タイヤ幅方向内側面122C、タイヤ半径方向内側面122B及びタイヤ幅方向外側面122Aに、それぞれ全面的に接合されている。
前記した図11A~図11F及び図12A~図12Dに示される例では、補強層114のビードコア側の末端114Aが、該ビードコア122の周囲に位置1している。この末端114Aは、ビードコア122に熱溶着されている。なお、この末端114Aは、ビードコア122の周囲に位置していればよく、必ずしもビードコア122に熱溶着されていなくてもよい。
図13Aに示される例では、補強層114の末端114Aは、ビードコア122を構成する3層のうち最もタイヤ半径方向外側に位置する層と、タイヤ半径方向中央に位置する層との間に位置している。
図13Bに示される例では、補強層114の末端114Aは、ビードコア122を構成する3層のうち最もタイヤ半径方向内側に位置する層と、タイヤ半径方向中央に位置する層との間に位置している。
図13Cに示される例では、ビードコア122がモノストランドビードとなっており、補強層114の末端114Aは、タイヤ幅方向に隣り合う3対のコード120の間に位置している。図13Dに示される例では、ビードコア122を構成する3層のうち最もタイヤ幅方向外側に位置する層と、タイヤ幅方向中央に位置する層との間に位置している。このビードコア122は、タイヤ幅方向に積み重ねられたストランドビードである。図13C及び図13Dにおいて、補強層114の末端114Aは、ビードコア122のコード120間に、タイヤ半径方向外側から内側に向かって入り込んだ状態となっている。
本実施形態は、少なくともコードが樹脂被覆されたビードコアが埋設されたビード部と、前記ビード部のタイヤ半径方向外側に連なるサイド部とを有する樹脂製のタイヤ骨格部材と、有機繊維が樹脂材料により被覆され、前記ビードコアに熱溶着され、前記ビード部から前記サイド部へ延びる補強層と、を備えている。以下その作用について説明する。
また、タイヤ110において、サイド部に配置された補強層114の有機繊維を、コード部材及び接着層の二層で構成することで、有機繊維を補強層114のみならずタイヤ骨格部材112とも強く接着させることが可能となる。
前記第4実施形態では、補強層114がタイヤ周方向に並べて配置されるものとしたが、補強層114が一体的に構成されていてもよい。また、タイヤ周方向に隣り合う補強層114を互いに部分的に重ねてもよい。更に、タイヤ周方向に隣り合う補強層114の間に、他の補強層(図示せず)を配置してもよい。この場合、他の補強層と補強層114とを部分的に重ねてもよい。また、他の補強層のタイヤ周方向一方側を隣接する補強層114と部分的に重ね、タイヤ周方向他方側を隣接する補強層114と重ねず、例えば0.1mm以上の隙間を設けるようにしてもよい。
〈ナイロン繊維〉
コード部材として、ナイロン繊維(ナイロン66)のマルチフィラメントである、1400dtex/2、撚り数39×39(回/dm)で表される構造のナイロン繊維(ナイロン66)で形成されたコード部材を準備した。
下記条件に示す配合で、接着層を形成するためのRF組成物を作製した。
〈条件〉
・水酸化ナトリウム溶液(10質量%水溶液)(東ソー社製):33.3質量部
・ホルムアルデヒド(37質量%水溶液)(イソバン、日本化成社製):34.8質量部
・レゾルシノール(住友化学社製):27.1質量部
・水:904.8質量部
<RF処理>
前記コード部材に、前記にて作製したRF組成物を含浸塗布し、160℃80秒での乾燥及び170℃60秒でのベーキングを行うことで、コード部材及びRF接着層が積層された有機繊維を得た。
前記有機繊維を一般的なラミネーター(コーテイング装置)に設置し、樹脂材料であるポリアミド系熱可塑性エラストマー(ポリアミド12系樹脂、宇部興産社製「UBESTA、XPA9055)を、樹脂押し出し時のダイ温度が245℃及びラミネータープレス温度が230℃の条件で、前記有機繊維上にコーテイングして13cm(幅)×100mm(長さ)×0.8mm(厚さ)のラミネート板を作製し、これを試験片1とした。なお、試験片1は、横一列のみに1mm間隔で、100本打ち込まれ有機繊維を含む形態を有する。
比較例1として、ナイロン繊維(ナイロン66)で形成されたコード部材を、RF処理せずに、そのまま前記コーテイング装置に設置し、実施例1と同様に、樹脂コーテイング処理してラミネート板を作製し、これを試験片2とした。
前記にて作製した実施例及び比較例における各試験片の接着力について、国際公開第2010125992号に記載された加硫ゴムの試験片における接着力の測定方法を利用して求めた。すなわち、上記各試験片について、それらの有機繊維と樹脂材料との接着強度を、JIS K6301(1995年に規定される「7.はく離試験」に準拠した試験方法によって求めた。測定においては、各試験片であるラミネート板中に埋め込まれている有機繊維を、一定の引張り速度で有機繊維をラミネート板から掘り起こす際における有機繊維1本を掘り起こすのに必要な力を、接着力(N/本)として表した。
<結果>
このように、有機繊維を、ナイロン系繊維材料を含むコード部材及びRF層を有する構造とし、樹脂材料に被覆されることで、コード部材と樹脂材料とを十分に接着させた補強層が得られることが示された。
本明細書に記載された全ての文献、特許出願、及び技術規格は、個々の文献、特許出願、及び技術規格が参照により取り込まれることが具体的かつ個々に記された場合と同程度に、本明細書中に参照により取り込まれる。
Claims (5)
- ビード部及び前記ビード部のタイヤ半径方向外側に連なるサイド部を有する樹脂製のタイヤ骨格部材と、
有機繊維及び前記有機繊維を被覆する樹脂材料を含む補強層と、を備え、
前記有機繊維が、ナイロン系繊維材料を含むコード部材と、前記コード部材上に設けられレゾルシノール-ホルムアルデヒド樹脂を含む組成物で形成された接着層と、を有するタイヤ。 - 前記補強層に含まれる前記樹脂材料が、ポリアミド系熱可塑性樹脂又はポリウレタン系熱可塑性樹脂を含む請求項1に記載のタイヤ。
- 前記ポリアミド系熱可塑性樹脂が、ポリアミド系熱可塑性エラストマーである請求項2に記載のタイヤ。
- 前記コード部材が、複数のモノフィラメントを撚り合わせた1本のマルチフィラメントの1本単体を片撚りしたもの、または、前記マルチフィラメントの2本以上を撚り合わせたものである請求項1~請求項3のいずれか1項に記載のタイヤ。
- 前記補強層が、前記サイド部に配置された請求項1~請求項4のいずれか1項に記載のタイヤ。
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EP16853446.9A EP3360697B1 (en) | 2015-10-07 | 2016-09-26 | Tire |
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WO2019230353A1 (ja) * | 2018-05-30 | 2019-12-05 | 株式会社ブリヂストン | タイヤ |
CN111278664A (zh) * | 2017-10-25 | 2020-06-12 | 株式会社普利司通 | 轮胎用金属树脂复合构件及轮胎 |
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JP6969596B2 (ja) * | 2019-10-08 | 2021-11-24 | 住友ゴム工業株式会社 | 空気入りタイヤ |
DE102021209234A1 (de) * | 2021-08-23 | 2023-02-23 | Continental Reifen Deutschland Gmbh | Verfahren zum Herstellen von nachhaltigeren Verbundmaterialien zur Verwendung bei der Herstellung von Fahrzeugreifen |
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