JP2012056520A - Tire and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire which is formed using a thermoplastic resin material, and has excellent shock resistance and breakage resistance, and to provide a method of manufacturing the tire which is high in productivity.SOLUTION: The tire 10 has at least a circular tire frame 17 made of a thermoplastic resin material. The thermoplastic resin material includes a polyamide-based thermoplastic elastomer, an olefin-(meth)acrylic acid copolymer, and an acid-modified copolymer formed by acid-modifying an olefin-(meth)acrylate copolymer.

Description

  The present invention relates to a tire mounted on a rim, and more particularly to a tire formed at least partially from a thermoplastic material and a method for manufacturing the same.

  Conventionally, pneumatic tires made of rubber, organic fiber materials, steel members, and the like are used in vehicles such as passenger cars.

In recent years, from the viewpoint of weight reduction, ease of molding, and ease of recycling, the use of resin materials, particularly thermoplastic resins and thermoplastic elastomers, as tire materials has been studied.
For example, Patent Document 1 discloses a pneumatic tire formed using a thermoplastic polymer material.

JP 2003-104008 A

A tire using a thermoplastic polymer material is easier to manufacture and lower in cost than a conventional rubber tire. However, when the tire frame is formed of a uniform thermoplastic polymer material that does not have a reinforcing member such as a carcass ply, it is improved in terms of stress resistance and internal pressure resistance compared to conventional rubber tires. There is room.
Further, when a tire is manufactured using a thermoplastic polymer material, it is required to realize performance comparable to that of a conventional rubber tire while increasing manufacturing efficiency and realizing low cost.

  In light of the above circumstances, an object of the present invention is to provide a tire formed using a thermoplastic resin material and excellent in impact resistance and breakability, and a method for manufacturing a tire excellent in productivity. To do.

(1) The tire of the present invention is a tire having at least an annular tire skeleton formed of a thermoplastic resin material, and the thermoplastic resin material includes a polyamide-based thermoplastic elastomer and an olefin- (meta). A tire containing an acrylic acid copolymer and an acid-modified copolymer obtained by acid-modifying an olefin- (meth) acrylate copolymer.
Here, the “thermoplastic elastomer” is a thermoplastic resin material having a hard segment and a soft segment in the molecule. Specifically, it is a high molecular compound having elasticity, and is a hard crystalline material having a high melting point. It refers to a thermoplastic resin material comprising a copolymer having a polymer constituting a segment and a polymer constituting an amorphous soft segment having a low glass transition temperature.
“Polyamide thermoplastic elastomer” is a highly elastic polymer compound that forms a crystalline hard segment with a high melting point and a non-crystalline polymer with a low glass transition temperature. It is a thermoplastic resin material made of a copolymer having a amide bond (—CONH—) in the main chain of the polymer constituting the hard segment.
The resin in the present invention means a resin having thermoplasticity or thermosetting property, and does not include conventional vulcanized rubber such as natural rubber and synthetic rubber. Thermoplastic elastomers also do not include vulcanized rubber such as conventional natural rubber or synthetic rubber.

The “olefin- (meth) acrylic acid copolymer” refers to a copolymer containing a partial structure derived from (meth) acrylic acid in the repeating unit of olefin. “(Meth) acrylic acid” means at least one of acrylic acid and methacrylic acid.
The “acid-modified copolymer obtained by acid-modifying an olefin- (meth) acrylate copolymer” has an acidic group in a copolymer containing a partial structure derived from (meth) acrylate in the repeating unit of olefin. A copolymer to which a compound is bonded. “(Meth) acrylate” means at least one of acrylate and methacrylate.
“Olefin- (meth) acrylic acid copolymer” is also called a specific copolymer, and “acid-modified copolymer obtained by acid-modifying an olefin- (meth) acrylate copolymer” is a specific acid-modified copolymer. Also called coalescence.

  Here, as the olefin constituting the olefin repeating unit in the specific copolymer and the specific acid-modified copolymer, ethylene, propylene, and 1-butene are preferable, and ethylene is more preferable.

  The thermoplastic resin material according to the present invention contains a specific copolymer, a specific acid-modified copolymer, and a polyamide-based thermoplastic elastomer, so that the thermoplastic resin material has injection moldability and impact resistance. Excellent breakability.

  When the polyamide-based thermoplastic elastomer is used alone, it is necessary to control the ratio between the hard segment and the soft segment when adjusting the elastic modulus. In addition, when a polyamide-based thermoplastic elastomer and a specific copolymer are included, there is a tendency to break into a layer when pulled. In contrast, when at least three components of a polyamide-based thermoplastic elastomer, a specific copolymer, and a specific acid-modified copolymer are used in combination, the polyamide-based thermoplastic elastomer can be used alone by adjusting the content ratio of the three components. Compared with the case where it is used, the elastic modulus of the thermoplastic resin material can be easily adjusted, and the fracture state when pulled can be improved.

(2) The tire of the present invention comprises the polyamide-based thermoplastic elastomer (x), the olefin- (meth) acrylic acid copolymer (specific copolymer; y), and the acid-modified copolymer (specific acid-modified). It can be configured such that the mass ratio (x: y + z) to the copolymer; z) is 95: 5 to 50:50.
If the amount ratio of the polyamide-based thermoplastic elastomer in the thermoplastic resin material to the olefin- (meth) acrylic acid copolymer and the acid-modified copolymer is within the above range, the performance of the thermoplastic resin material is sufficient. Thus, tensile properties such as tensile elasticity and breaking strength as tire performance can be improved.

In the tire of the present invention, the mass ratio of the olefin- (meth) acrylic acid copolymer (specific copolymer; y) and the acid-modified copolymer (specific acid-modified copolymer; z). (Y: z) can be configured to be 95: 5 to 20:80.
If the quantity ratio of the specific copolymer and the specific acid-modified copolymer in the thermoplastic resin material is within the above range, the performance of the thermoplastic resin material can be fully exerted, and the tensile elasticity and breaking strength as tire performance The tensile properties such as can be improved.

(3) The tire of the present invention includes the polyamide-based thermoplastic elastomer in the thermoplastic resin material, the olefin- (meth) acrylic acid copolymer (specific copolymer), and the acid-modified copolymer ( The total content with the specific acid-modified copolymer) may be 50% by mass to 100% by mass.
When the total content of the polyamide-based thermoplastic elastomer, the specific copolymer, and the specific acid-modified copolymer in the thermoplastic resin material is within the above range, the performance of the thermoplastic resin material can be sufficiently exerted, and the tire performance As a result, tensile properties such as tensile elasticity and breaking strength can be further improved.

Further, in the tire of the present invention, the reinforcing cord member is wound around the outer periphery of the tire frame formed of the thermoplastic resin material in addition to the tire frame formed of the thermoplastic resin material. You may have the reinforcement cord member which forms a layer.
When the reinforcing cord member is wound around the outer periphery of the tire skeleton formed of the thermoplastic resin material to form the reinforcing cord member layer, the tire has a puncture resistance, a cut resistance, and a tire (tire skeleton body). ) Circumferential rigidity is improved. In addition, the improvement of the circumferential rigidity suppresses the creep of the tire frame formed of a thermoplastic material (a phenomenon in which the plastic deformation of the tire frame increases with time under a certain stress).

(4) In the tire of the present invention, the olefin- (meth) acrylic acid copolymer is an ethylene- (meth) acrylic acid copolymer, and the acid-modified copolymer is an ethylene- (meth) acrylate copolymer. It can be configured to be an acid-modified copolymer obtained by acid-modifying a polymer.
By setting it as the said structure, the performance which a thermoplastic resin material has can fully be exhibited, and tensile characteristics, such as tensile elasticity and rupture strength as tire performance, can be improved.

(5) The method for producing a tire of the present invention includes at least an acid modification formed by acid-modifying a polyamide-based thermoplastic elastomer, an olefin- (meth) acrylic acid copolymer, and an olefin- (meth) acrylate copolymer. A tire skeleton piece forming step of forming a tire skeleton piece constituting a part of the annular tire skeleton by a thermoplastic resin material containing a copolymer, and applying a heat to a joint surface of the tire skeleton piece A tire frame piece joining step of fusing two or more of the tire frame pieces to form the tire frame body.

In the method for manufacturing a tire of the present invention, a tire frame piece of an annular tire frame body is formed of a thermoplastic resin material. Since the thermoplastic resin material according to the present invention contains a polyamide-based thermoplastic elastomer, a specific copolymer, and a specific acid-modified copolymer, and has excellent fluidity, the thermoplastic resin material is used. The injection molding can be easily performed. Therefore, the productivity of the tire can be improved.
This is considered to be due to the following reason.

  Due to the acid group of the specific acid-modified copolymer, the mixing property of the polyamide-based thermoplastic elastomer and the specific copolymer is increased, and when the polyamide-based thermoplastic elastomer is the sea phase and the specific copolymer is the island phase, It becomes easy to form a sea-island structure. In such a sea-island structure, it is considered that the specific acid-modified copolymer is present at the interface between the sea phase and the island phase, and increases the affinity between the sea phase and the island phase. By increasing the affinity between the sea phase and the island phase, the viscosity of the thermoplastic resin material increases, but by including a specific copolymer, the affinity can be adjusted and the fluidity will be excellent. Therefore, it is considered that injection molding can be easily performed.

(6) In the tire manufacturing method of the present invention, the olefin- (meth) acrylic acid copolymer is an ethylene- (meth) acrylic acid copolymer, and the acid-modified copolymer is ethylene- (meta ) It can be configured to be an acid-modified copolymer obtained by acid-modifying an acrylate copolymer.
By setting it as the said structure, the performance which a thermoplastic resin material has can fully be exhibited, and the tire excellent in tensile characteristics, such as tensile elasticity as a tire performance, and breaking strength, can be manufactured.

  As described above, according to the present invention, a tire formed using a thermoplastic resin material and excellent in impact resistance and breakability, and a method for manufacturing a tire excellent in productivity are provided. Can do.

(A) is a perspective view showing a section of a part of a tire concerning one embodiment of the present invention, and (B) is a sectional view of a bead part attached to a rim. It is sectional drawing along the tire rotating shaft which shows the state by which the reinforcement cord was embed | buried under the crown part of the tire case of the tire of 1st Embodiment. It is explanatory drawing for demonstrating the operation | movement which embeds a reinforcement cord in the crown part of a tire case using a cord heating apparatus and rollers. It is sectional drawing of the tire which concerns on other embodiment. (A) is sectional drawing along the tire width direction of the tire which concerns on one Embodiment of this invention. (B) is an enlarged view of a cross section along a tire width direction of a bead portion in a state where a rim is fitted to a tire. It is sectional drawing along the tire width direction which shows the circumference | surroundings of the reinforcement layer of the tire of 2nd Embodiment.

  First, the thermoplastic resin material constituting the tire skeleton in the present invention will be described, and then specific embodiments of the tire of the present invention will be described with reference to the drawings.

[Thermoplastic resin material]
The tire of the present invention is a tire having at least an annular tire skeleton formed of a thermoplastic resin material, and the thermoplastic resin material includes a polyamide-based thermoplastic elastomer and an olefin- (meth) acrylic acid copolymer. A tire containing a polymer (specific copolymer) and an acid-modified copolymer (specific acid-modified copolymer) obtained by acid-modifying an olefin- (meth) acrylate copolymer.

When the thermoplastic resin material according to the present invention is applied to a tire because the thermoplastic resin material according to the present invention contains a polyamide-based thermoplastic elastomer, a specific copolymer, and a specific acid-modified copolymer. In addition, a tire excellent in impact resistance and breakability can be obtained.
Hereinafter, the polyamide-based thermoplastic elastomer, the specific copolymer, and the specific acid-modified copolymer will be described.

[Polyamide thermoplastic elastomer]
“Thermoplastic elastomer” is a thermoplastic resin material having a hard segment and a soft segment in the molecule. Specifically, it is a polymer compound having elasticity, and is a crystalline hard crystal segment having a high melting point or physical properties. It refers to a thermoplastic resin material comprising a copolymer having a hard segment forming pseudo-crosslinks by agglomeration and a non-crystalline polymer having a low glass transition temperature.
“Polyamide thermoplastic elastomer” is a polymer compound that has elasticity, a polymer that forms a crystalline hard segment with a high melting point, and a polymer that forms an amorphous soft segment with a low glass transition temperature. It is a thermoplastic resin material made of a copolymer having a amide bond (—CONH—) in the main chain of the polymer constituting the hard segment. Examples of the polyamide-based thermoplastic elastomer include an amide-based thermoplastic elastomer (TPA) defined in JIS K6418: 2007, a polyamide-based elastomer described in JP-A-2004-346273, and the like.

  The polyamide-based thermoplastic elastomer is not particularly limited. However, the crystalline polyamide constitutes a hard segment having a high melting point, and the amorphous polymer constitutes a soft segment having a low glass transition temperature. A polymer is mentioned.

Examples of the crystalline polyamide constituting the hard segment include polycapramide (nylon-6), poly-ω-aminoheptanoic acid (nylon-7), poly-ω-aminononanoic acid (nylon-9), polyundecanamide (nylon- 11), polylauryl lactam (nylon-12), polyethylenediamine adipamide (nylon-2,6), polytetramethylene adipamide (nylon-4,6), polyhexamethylene adipamide (nylon-6, 6), polyhexamethylene sebamide (nylon-6,10), polyhexamethylene dodecamide (nylon-6,12), polyoctamethylene adipamide (nylon-8,6), polydecamethylene adipamide Aliphatic polyamides such as (Nylon-10,8), metaxylenediamine, paraxylenediamine And crystalline aromatic polyamides obtained by polycondensation reaction of aromatic diamines such as styrene with dicarboxylic acids such as adipic acid, suberic acid, sebacic acid, cyclohexanedicarboxylic acid, terephthalic acid and isophthalic acid, or derivatives thereof. .
Among these, nylon-6, nylon-6,6, nylon-12 and the like are preferable, and nylon-12 is more preferable.

Examples of the polymer constituting the soft segment include a polymer selected from polymethylene and aliphatic polyether.
Aliphatic polyethers include poly (ethylene oxide) glycol, poly (propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol, copolymers of ethylene oxide and propylene oxide, poly (propylene oxide) Examples thereof include ethylene oxide addition polymers of glycol and copolymers of ethylene oxide and tetrahydrofuran.

  The number average molecular weight (Mn) of the polymer (polyamide) constituting the hard segment is preferably 300 to 15000 from the viewpoint of melt moldability. Moreover, as a number average molecular weight of the polymer which comprises the said soft segment, 200-6000 are preferable from a viewpoint of toughness and low temperature flexibility. Furthermore, the mass ratio (Ha: Sa) to the hard segment (Ha) and the soft segment (Sa) is preferably 50:50 to 90:10, and more preferably 50:50 to 80:20, from the viewpoint of moldability. preferable.

  The polyamide-based thermoplastic elastomer can be synthesized by copolymerizing the polymer constituting the hard segment and the polymer constituting the soft segment by a known method.

  Examples of the polyamide-based thermoplastic elastomer include, for example, “UBESTA, XPA” series (for example, XPA9063X1, XPA9055X1, XPA9048X2, XPA9048X1, XPA9040X1, XPA9040X2, etc.) of Ube Industries, Ltd., and Daicel Eponic Corporation. “Vestamide” series (for example, E40-S3, E47-S1, E47-S3, E55-S1, E55-S3, EX9200, E50-R2) and the like can be used.

[Specific copolymer]
The thermoplastic resin material contains an olefin- (meth) acrylic acid copolymer (specific copolymer).
Here, the “olefin- (meth) acrylic acid copolymer” refers to a copolymer containing a partial structure derived from (meth) acrylic acid in the repeating unit of olefin. “(Meth) acrylic acid” means at least one of acrylic acid and methacrylic acid. The mode of the copolymer may be a radical polymer, a block copolymer, or a graft copolymer.

In the olefin- (meth) acrylic acid copolymer, the olefin constituting the olefin repeating unit is preferably ethylene, propylene or 1-butene, more preferably ethylene.
That is, the olefin- (meth) acrylic acid copolymer is preferably an ethylene- (meth) acrylic acid copolymer. More preferably, it is an ethylene-methacrylic acid copolymer.
Only one type of olefin- (meth) acrylic acid copolymer may be used, or two or more types may be used.

The number average molecular weight (Mn) of the specific copolymer is preferably 5,000 to 10,000,000, and preferably 7,000 to 1,000,000 from the viewpoint of melt moldability of the thermoplastic resin material. It is more preferable that
As the olefin, ethylene is preferable, and as the specific copolymer, an ethylene-methacrylic acid copolymer is preferable.

  As the specific copolymer, a commercially available product may be used. For example, nucler (N035C, AN42115C, etc.) manufactured by Mitsui DuPont Polychemical Co., Ltd. may be used.

[Specific acid-modified copolymer]
The thermoplastic resin material contains an acid-modified copolymer (specific acid-modified copolymer) obtained by acid-modifying an olefin- (meth) acrylate copolymer.
Here, the “acid-modified copolymer obtained by acid-modifying an olefin- (meth) acrylate copolymer” is a copolymer containing a partial structure derived from (meth) acrylate in the repeating unit of olefin [ That is, it refers to a copolymer obtained by binding a compound having an acidic group to an olefin- (meth) acrylate copolymer]. “(Meth) acrylate” means at least one of acrylate and methacrylate.

  More specifically, “bonding a compound having an acidic group to the olefin- (meth) acrylate copolymer” means that the olefin- (meth) acrylate copolymer is bonded to a carboxylic acid group, a sulfuric acid group, or a phosphoric acid group. It means that an unsaturated compound having an acidic group such as is bonded. For example, when an unsaturated carboxylic acid (generally maleic anhydride) is used as the unsaturated compound having an acidic group, an unsaturated bond site of the unsaturated carboxylic acid is added to the olefin- (meth) acrylate copolymer. Bonding (for example, graft polymerization) can be mentioned.

  The compound having an acidic group is preferably a compound having a carboxylic acid group (carboxy group), which is a weak acid group, from the viewpoint of suppressing deterioration of the olefin- (meth) acrylate copolymer. For example, acrylic acid, methacrylic acid, itacon Examples include acids, crotonic acid, isocrotonic acid, maleic acid and the like.

In the olefin- (meth) acrylate copolymer, the olefin constituting the olefin repeating unit is preferably ethylene, propylene or 1-butene, more preferably ethylene.
That is, the olefin- (meth) acrylate copolymer is preferably an ethylene- (meth) acrylate copolymer.
Therefore, the specific acid-modified copolymer is preferably an acid-modified product of an ethylene- (meth) acrylate copolymer.
More preferably, it is a carboxylic acid-modified copolymer obtained by acid-modifying an ethylene- (meth) acrylate ethyl ester copolymer with a compound having a carboxylic acid group (carboxy group), and more preferably ethylene-acrylate ethyl ester. It is a carboxylic acid modified product of a copolymer.
Only 1 type may be used for a specific acid modification copolymer, and 2 or more types may be used for it.

  The number average molecular weight (Mn) of the specific acid-modified copolymer is preferably 5,000 to 10,000,000 from the viewpoint of melt moldability of the thermoplastic resin material, and is preferably 7,000 to 1,000. Is more preferable.

  As the specific acid-modified copolymer, a commercially available product may be used, and examples thereof include HPR (AR2011 and the like) manufactured by Mitsui DuPont Polychemical Co., Ltd.

In the thermoplastic resin material, the mass ratio (x: y + z) of the polyamide-based thermoplastic elastomer (x), the specific copolymer (y), and the specific acid-modified copolymer (z) is impact resistance and fracture. From the viewpoint of property, it is preferably 95: 5 to 50:50, and more preferably 90:10 to 50:50.
In the thermoplastic resin material, the mass ratio (y: z) of the specific copolymer (y) and the specific acid-modified copolymer (z) is preferably 95: 5 to 10:90. 80:20 to 20:80 is more preferable. By setting it as such a range, the performance which a thermoplastic resin material has can fully be exhibited, and tensile characteristics, such as tensile elasticity as tire performance, breaking strength, and breakability, can be improved. The specific copolymer and the specific acid-modified copolymer are preferably used in combination of an ethylene-methacrylic acid copolymer and an acid-modified ethylene-acrylate copolymer.

  Furthermore, in the thermoplastic resin material, the total content of the thermoplastic elastomer, the specific copolymer, and the specific acid-modified copolymer in the thermoplastic resin material is a viewpoint that sufficiently exerts the performance of the thermoplastic resin material. Therefore, the content is preferably 50% by mass to 100% by mass and more preferably 50% by mass to 90% by mass with respect to the total mass of the thermoplastic resin material.

  The thermoplastic resin material contains various additives such as various fillers (for example, silica, calcium carbonate, clay), anti-aging agents, oils, plasticizers, colorants, weathering agents, and reinforcing materials as desired. You may let them.

  The thermoplastic resin material can be obtained by mixing a thermoplastic elastomer, a specific copolymer, and a specific acid-modified copolymer, adding various additives as necessary, and melt-mixing them. The mixing ratio of the thermoplastic elastomer, the specific copolymer, and the specific acid-modified copolymer is in accordance with the aforementioned ratio. The thermoplastic resin material obtained by melt mixing can be used in the form of pellets if necessary.

  The thermoplastic resin material has a tensile elastic modulus (unless otherwise specified, “elastic modulus” means a tensile elastic modulus unless otherwise specified) as defined in JIS K7113: 1995, preferably 100 to 1000 MPa. ˜800 MPa is more preferable, and 100 to 700 MPa is particularly preferable. When the tensile elastic modulus of the thermoplastic resin material is 100 to 1000 MPa, the rim can be assembled efficiently while maintaining the shape of the tire frame.

  The tensile yield strength specified in JIS K7113: 1995 of the thermoplastic resin material is preferably 5 MPa or more, preferably 5 to 20 MPa, and more preferably 5 to 17 MPa. When the tensile yield strength of the thermoplastic resin material is 5 MPa or more, the thermoplastic resin material can withstand deformation against a load applied to the tire during traveling.

  The tensile yield elongation specified in JIS K7113: 1995 of the thermoplastic resin material is preferably 10% or more, preferably 10 to 70%, and more preferably 15 to 60%. When the tensile yield elongation of the thermoplastic resin material is 10% or more, the elastic region is large and the rim assembly property can be improved.

  The tensile elongation at break (JIS K7113: 1995) specified in JIS K7113: 1995 of the thermoplastic resin material is preferably 50% or more, preferably 100% or more, more preferably 150% or more, and particularly preferably 200% or more. . When the tensile elongation at break of the thermoplastic resin material is 50% or more, the rim assembly property is good and it is possible to make it difficult to break against a collision.

  As a deflection temperature under load (at the time of 0.45 MPa load) specified in ISO75-2 or ASTM D648 of the thermoplastic resin material, 50 ° C. or more is preferable, 50 to 150 ° C. is preferable, and 50 to 130 ° C. is more preferable. When the deflection temperature under load of the thermoplastic resin material is 50 ° C. or higher, deformation in the adding process such as tread can be suppressed.

[Resin material constituting the reinforcing cord layer]
The tire of the present invention may have a reinforcing cord member that is wound in the circumferential direction on the outer peripheral portion of the tire frame to form a reinforcing cord layer.
Further, the reinforcing cord layer can be configured to include a resin material. In this way, if the reinforcing cord layer contains a resin material, the difference in hardness between the tire and the reinforcing cord layer can be reduced as compared with the case where the reinforcing cord is fixed with cushion rubber. The member can be adhered and fixed to the tire frame. As described above, the “resin material” is a concept including a thermoplastic resin (including a thermoplastic elastomer) and a thermosetting resin, and does not include vulcanized rubber.

  Furthermore, when the reinforcement cord is a steel cord, when trying to separate the reinforcement cord from the cushion rubber when disposing of the tire, it is difficult to separate the vulcanized rubber from the reinforcement cord only by heating, whereas the resin material is reinforced only by heating. It can be separated from the code. This is advantageous in terms of tire recyclability. In addition, the resin material usually has a lower loss coefficient (Tan δ) than vulcanized rubber. For this reason, if the reinforcing cord layer contains a large amount of resin material, the rolling property of the tire can be improved. Furthermore, a resin material having a relatively high elastic modulus as compared with vulcanized rubber has an advantage that the in-plane shear rigidity is large and the stability and wear resistance during running of the tire are excellent.

  Examples of the thermosetting resin that can be used for the reinforcing cord layer include phenol resin, urea resin, melamine resin, epoxy resin, polyamide resin, and polyester resin.

  Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, polyamide resin, and polyester resin.

Examples of the thermoplastic elastomer include amide-based thermoplastic elastomer (TPA), ester-based thermoplastic elastomer (TPC), olefin-based thermoplastic elastomer (TPO), and styrene-based thermoplastic elastomer (specified in JIS K6418: 2007). TPS), urethane-based thermoplastic elastomer (TPU), crosslinked thermoplastic rubber (TPV), or other thermoplastic elastomer (TPZ). Note that it is preferable to use a thermoplastic elastomer in consideration of elasticity required at the time of traveling, moldability at the time of manufacture, and the like.
Moreover, the same kind of resin material refers to forms, such as ester systems and styrene systems.

The elastic modulus (tensile elastic modulus specified in JIS K7113: 1995) of the resin material used for the reinforcing cord layer is in the range of 0.1 to 10 times the elastic modulus of the thermoplastic resin forming the tire frame body. It is preferable to set. When the elastic modulus of the resin material is 10 times or less than the elastic modulus of the thermoplastic resin material forming the tire frame body, the crown portion is not too hard and rim assembly is facilitated. Further, when the elastic modulus of the resin material is 0.1 times or more of the elastic modulus of the thermoplastic resin material forming the tire frame body, the resin constituting the reinforcing cord layer is not too soft and the in-plane shear rigidity Excellent cornering power.
In addition, when a resin material is included in the reinforcing cord layer, the surface of the reinforcing cord member is covered with a resin material by 20% or more from the viewpoint of enhancing the pullability (hardness of being pulled out) of the reinforcing cord. Preferably, it is more preferably 50% or more. Further, the content of the resin material in the reinforcing cord layer is preferably 20% by mass or more from the viewpoint of improving the pullability of the reinforcing cord with respect to the total amount of the material constituting the reinforcing cord layer excluding the reinforcing cord, 50 mass% or more is still more preferable.

[First Embodiment]
A tire according to a first embodiment of the tire of the present invention will be described below with reference to the drawings.
The tire 10 of this embodiment will be described. FIG. 1A is a perspective view showing a partial cross section of a tire according to an embodiment of the present invention. FIG. 1B is a cross-sectional view of the bead portion attached to the rim. As shown in FIG. 1, the tire 10 of the present embodiment has a cross-sectional shape substantially similar to that of a conventional general rubber pneumatic tire.

  As shown in FIG. 1A, the tire 10 includes a pair of bead portions 12 that contact the bead seat 21 and the rim flange 22 of the rim 20 shown in FIG. A tire case 17 comprising: a side portion 14 extending in the direction of a tire; and a crown portion 16 (outer peripheral portion) for connecting a tire radial direction outer end of one side portion 14 and a tire radial direction outer end of the other side portion 14. ing.

  Here, the tire case 17 of the present embodiment includes a polyamide-based thermoplastic elastomer (“UBESTA, XPA9055X1” manufactured by Ube Industries, Ltd.) and a specific copolymer (an ethylene-methacrylic acid copolymer manufactured by Mitsui DuPont Polychemical Co., Ltd.). “Nucleel, N035C”) and a specific acid-modified copolymer (acid-modified “HPR, AR2011” of an ethylene-acrylate ethyl ester copolymer manufactured by Mitsui DuPont Polychemical Co., Ltd.)) It is formed of a plastic resin material. In the present embodiment, the tire case 17 is formed of only the thermoplastic resin material according to the present invention. However, the present invention is not limited to this configuration, and the tire case is similar to a conventional general rubber pneumatic tire. You may use the other thermoplastic resin material which has a different characteristic for every 17 site | parts (side part 14, crown part 16, bead part 12, etc.). Further, a reinforcing material (polymer material, metal fiber, cord, nonwoven fabric, woven fabric, etc.) is embedded in the tire case 17 (for example, the bead portion 12, the side portion 14, the crown portion 16 and the like), and the reinforcing material is provided. The tire case 17 may be reinforced.

The tire case 17 of the present embodiment is formed by joining a pair of tire case halves (tire frame pieces) 17A formed of the thermoplastic resin material according to the present invention. The tire case half 17A is formed by injection molding or the like so that one bead portion 12, one side portion 14, and a half-width crown portion 16 are integrated with each other so as to face each other. It is formed by joining at the tire equator part. The thermoplastic resin material according to the present invention includes a thermoplastic elastomer, a specific copolymer, and a specific acid-modified copolymer. Therefore, the thermoplastic resin material is excellent in fluidity, and the injection molding of the tire case half body 17A can be easily performed.
The tire case 17 is not limited to the one formed by joining two members, and may be formed by joining three or more members.

The tire case half 17A formed of a thermoplastic resin material can be molded by, for example, vacuum molding, pressure molding, injection molding, melt casting, or the like. For this reason, it is not necessary to perform vulcanization compared to the case where the tire case is molded with rubber as in the prior art, the manufacturing process can be greatly simplified, and the molding time can be omitted.
In the present embodiment, the tire case half body 17A has a symmetrical shape, that is, the one tire case half body 17A and the other tire case half body 17A have the same shape. There is also an advantage that only one type of mold is required.

  In the present embodiment, as shown in FIG. 1 (B), an annular bead core 18 made of a steel cord is embedded in the bead portion 12 as in a conventional general pneumatic tire. However, the present invention is not limited to this configuration, and the bead core 18 can be omitted if the rigidity of the bead portion 12 is ensured and there is no problem in fitting with the rim 20. In addition to the steel cord, an organic fiber cord, a resin-coated organic fiber cord, or a hard resin may be used.

In the present embodiment, a material having a better sealing property than a thermoplastic resin material constituting the tire case 17 at a portion that contacts the rim 20 of the bead portion 12 or at least a portion that contacts the rim flange 22 of the rim 20, for example, An annular seal layer 24 made of rubber is formed. The seal layer 24 may also be formed at a portion where the tire case 17 (bead portion 12) and the bead sheet 21 are in contact with each other. As a material having a better sealing property than the thermoplastic resin material constituting the tire case 17, a softer material can be used as compared with the thermoplastic resin material constituting the tire case 17. As the rubber that can be used for the seal layer 24, it is preferable to use the same type of rubber as that used on the outer surface of the bead portion of a conventional general rubber pneumatic tire. Further, if the sealing property between the rim 20 can be ensured only with the thermoplastic resin material, the rubber seal layer 24 may be omitted, and the thermoplastic resin (thermoplastic elastomer) having better sealing property than the thermoplastic resin material. May be used.
Examples of such thermoplastic resins include polyurethane resins, polyolefin resins, polystyrene resins, polyester resins, and the like, and blends of these resins with rubbers or elastomers. Thermoplastic elastomers can also be used, for example, polyester-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polystyrene-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, combinations of these elastomers, and blends with rubber. Thing etc. are mentioned.

  As shown in FIG. 1, a reinforcing cord 26 having higher rigidity than the thermoplastic resin material constituting the tire case 17 is wound around the crown portion 16 in the circumferential direction of the tire case 17. The reinforcing cord 26 is wound spirally in a state in which at least a part thereof is embedded in the crown portion 16 in a cross-sectional view along the axial direction of the tire case 17, thereby forming a reinforcing cord layer 28. A tread 30 made of a material having higher wear resistance than the thermoplastic resin material constituting the tire case 17, for example, rubber, is disposed on the outer circumferential side of the reinforcing cord layer 28 in the tire radial direction.

  The reinforcing cord layer 28 formed by the reinforcing cord 26 will be described with reference to FIG. FIG. 2 is a cross-sectional view along the tire rotation axis showing a state where a reinforcing cord is embedded in a crown portion of the tire case of the tire according to the first embodiment. As shown in FIG. 2, the reinforcing cord 26 is spirally wound in a state in which at least a part is embedded in the crown portion 16 in a sectional view along the axial direction of the tire case 17. A reinforcing cord layer 28 indicated by a broken line portion in FIG. 2 is formed together with a part of the outer peripheral portion 17. The portion embedded in the crown portion 16 of the reinforcing cord 26 is in close contact with the thermoplastic resin material constituting the crown portion 16 (tire case 17). As the reinforcing cord 26, a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (twisted wire) obtained by twisting these fibers such as a steel cord twisted with a steel fiber can be used. In the present embodiment, a steel cord is used as the reinforcing cord 26.

  In FIG. 2, the burying amount L indicates the burying amount of the reinforcing cord 26 in the tire rotation axis direction with respect to the tire case 17 (crown portion 16). The embedding amount L of the reinforcing cord 26 in the crown portion 16 is preferably 1/5 or more of the diameter D of the reinforcing cord 26, and more preferably more than 1/2. Most preferably, the entire reinforcing cord 26 is embedded in the crown portion 16. When the embedment amount L of the reinforcing cord 26 exceeds 1/2 of the diameter D of the reinforcing cord 26, it is difficult to jump out of the embedded portion due to the size of the reinforcing cord 26. Further, when the entire reinforcing cord 26 is embedded in the crown portion 16, the surface (outer peripheral surface) becomes flat, and even if a member is placed on the crown portion 16 where the reinforcing cord 26 is embedded, Air can be prevented from entering. The reinforcing cord layer 28 corresponds to a belt disposed on the outer peripheral surface of the carcass of a conventional rubber pneumatic tire.

  As described above, the tread 30 is disposed on the outer peripheral side of the reinforcing cord layer 28 in the tire radial direction. The rubber used for the tread 30 is preferably the same type of rubber as that used in conventional rubber pneumatic tires. Instead of the tread 30, a tread formed of another type of thermoplastic resin material that is more excellent in wear resistance than the thermoplastic resin material constituting the tire case 17 may be used. Further, the tread 30 is formed with a tread pattern including a plurality of grooves on the ground contact surface with the road surface in the same manner as a conventional rubber pneumatic tire.

Hereinafter, the tire manufacturing method of the present invention will be described.
(Tire case molding process)
First, tire case halves supported by a thin metal support ring face each other. Next, a joining mold (not shown) is installed so as to be in contact with the outer peripheral surface of the abutting portion of the tire case half. Here, the said joining metal mold | die is comprised so that the periphery of the junction part (butting part) of the tire case half body A may be pressed with a predetermined pressure. Next, the periphery of the joint portion of the tire case half is pressed at a temperature equal to or higher than the melting point of the thermoplastic resin material constituting the tire case. When the joining portion of the tire case half is heated and pressurized by the joining mold, the joining portion is melted and the tire case halves are fused together, and the tire case 17 is formed by integrating these members. In the present embodiment, the joining portion of the tire case half is heated using a joining mold, but the present invention is not limited to this. For example, the joining portion is heated by a separately provided high-frequency heater or the like. Alternatively, the tire case halves may be joined by softening or melting in advance by irradiation with hot air, infrared rays, or the like, and pressurizing with a joining mold.

(Reinforcement cord member winding process)
Next, the reinforcing cord winding process will be described with reference to FIG. FIG. 3 is an explanatory diagram for explaining an operation of embedding a reinforcing cord in a crown portion of a tire case using a cord heating device and rollers. In FIG. 3, the cord supply device 56 is disposed on the reel 58 around which the reinforcing cord 26 is wound, the cord heating device 59 disposed on the downstream side of the reel 58 in the cord transport direction, and the downstream side of the reinforcing cord 26 in the transport direction. The first roller 60, the first cylinder device 62 that moves the first roller 60 in the direction of contacting and separating from the outer peripheral surface of the tire, and the downstream side in the conveying direction of the reinforcing cord 26 of the first roller 60 A second roller 64, and a second cylinder device 66 that moves the second roller 64 in a direction in which the second roller 64 comes in contact with and separates from the tire outer peripheral surface. The second roller 64 can be used as a metal cooling roller. Further, in the present embodiment, the surface of the first roller 60 or the second roller 64 is made of a fluororesin (in this embodiment, Teflon (registered trademark)) in order to suppress adhesion of a molten or softened thermoplastic resin material. ). In the present embodiment, the cord supply device 56 is configured to have two rollers, the first roller 60 or the second roller 64, but the present invention is not limited to this configuration, and any one of the rollers. It is also possible to have only one (that is, one roller).

  The cord heating device 59 includes a heater 70 and a fan 72 that generate hot air. Further, the cord heating device 59 includes a heating box 74 through which the cord 26 passes through an internal space in which hot air is supplied, and a discharge port 76 for discharging the heated cord 26.

  In this step, first, the temperature of the heater 70 of the cord heating device 59 is raised, and the ambient air heated by the heater 70 is sent to the heating box 74 by the wind generated by the rotation of the fan 72. Next, the reinforcing cord 26 unwound from the reel 58 is fed into a heating box 74 in which the internal space is heated with hot air (for example, the temperature of the reinforcing cord 26 is heated to about 100 to 200 ° C.). The heated reinforcing cord 26 passes through the discharge port 76 and is wound spirally around the outer peripheral surface of the crown portion 16 of the tire case 17 rotating in the direction of arrow R in FIG. Here, when the heated reinforcing cord 26 comes into contact with the outer peripheral surface of the crown portion 16, the thermoplastic resin material in the contact portion is melted or softened, and at least a part of the heated reinforcing cord 26 is outer peripheral surface of the crown portion 16. Buried in At this time, since the heated reinforcing cord 26 is embedded in the molten or softened thermoplastic resin material, the thermoplastic resin material and the reinforcing cord 26 are in a state where there is no gap, that is, in a close contact state. Thereby, the air entering to the portion where the reinforcing cord 26 is embedded is suppressed. In addition, by heating the reinforcing cord 26 to a temperature higher than the melting point of the thermoplastic resin material of the tire case 17, melting or softening of the thermoplastic resin material in a portion in contact with the reinforcing cord 26 is promoted. By doing in this way, it becomes easy to embed the reinforcement cord 26 in the outer peripheral surface of the crown part 16, and air entry can be effectively suppressed.

  The embedment amount L of the reinforcing cord 26 can be adjusted by the heating temperature of the reinforcing cord 26, the tension applied to the reinforcing cord 26, the pressing force by the first roller 60, and the like. In the present embodiment, the embedding amount L of the reinforcing cord 26 is set to be 1/5 or more of the diameter D of the reinforcing cord 26. The burying amount L of the reinforcing cord 26 is more preferably more than 1/2 of the diameter D, and most preferably the entire reinforcing cord 26 is embedded.

  In this way, the reinforcing cord layer 28 is formed on the outer peripheral side of the crown portion 16 of the tire case 17 by winding the heated reinforcing cord 26 while being embedded in the outer peripheral surface of the crown portion 16.

  Next, a vulcanized belt-like tread 30 is wound around the outer peripheral surface of the tire case 17 for one turn, and the tread 30 is bonded to the outer peripheral surface of the tire case 17 using an adhesive or the like. In addition, the precure tread used for the retread tire conventionally known can be used for the tread 30, for example. This step is the same step as the step of bonding the precure tread to the outer peripheral surface of the base tire of the retreaded tire.

  And if the sealing layer 24 which consists of vulcanized rubber is adhere | attached on the bead part 12 of the tire case 17 using an adhesive agent etc., the tire 10 will be completed.

(Function)
In the tire 10 of the present embodiment, since the tire case 17 is formed of the thermoplastic resin material according to the present invention, it is excellent in impact resistance and breakability. Furthermore, since the tire structure can be simplified, the weight is light compared to conventional rubber. For this reason, when the tire 10 of the present embodiment is applied to an automobile, the durability is excellent. Moreover, since the weight of the tire can be reduced, the fuel consumption of an automobile using such a tire can be improved.

  In addition, the polyamide-based thermoplastic elastomer, which is one of the constituent components of the thermoplastic resin material, has high adhesion to the reinforcing cord 26 and is excellent in fixing performance such as welding strength. Therefore, the phenomenon (air entering) that air remains around the reinforcing cord 26 in the reinforcing cord winding step can be particularly suppressed. If the adhesion to the reinforcement cord 26 and the weldability are high, and if air entry around the reinforcement cord member is suppressed, it is possible to effectively suppress the movement of the reinforcement cord 26 due to input during traveling or the like. . Thereby, for example, even when the tire constituent member is provided so as to cover the entire reinforcing cord member on the outer peripheral portion of the tire frame body, the movement of the reinforcing cord member is suppressed. The peeling of the tire frame (including the tire frame) is suppressed, and the durability of the tire 10 is improved.

  In the tire 10 of the present embodiment, the reinforcing cord 26 having higher rigidity than the thermoplastic resin material is spirally wound in the circumferential direction on the outer peripheral surface of the crown portion 16 of the tire case 17 formed of the thermoplastic resin material. Therefore, puncture resistance, cut resistance, and circumferential rigidity of the tire 10 are improved. In addition, the creep of the tire case 17 formed of the thermoplastic resin material is prevented by improving the circumferential rigidity of the tire 10.

  In addition, at least a part of the reinforcing cord 26 is formed on the outer peripheral surface of the crown portion 16 of the tire case 17 made of a thermoplastic resin material in a cross-sectional view along the axial direction of the tire case 17 (the cross section shown in FIG. 1). Since it is embedded and is in close contact with the thermoplastic resin material, entry of air at the time of manufacture is suppressed, and movement of the reinforcing cord 26 due to input during travel is suppressed. Thereby, it is suppressed that peeling etc. arise in the reinforcement cord 26, the tire case 17, and the tread 30, and durability of the tire 10 improves.

And since the embedding amount L of the reinforcement cord 26 is 1/5 or more of the diameter D as shown in FIG. 2, the air entry at the time of manufacture is suppressed effectively, the input at the time of driving, etc. This further suppresses the movement of the reinforcing cord 26.
When the reinforcing cord layer 28 is configured to include the thermoplastic resin material as described above, the difference in hardness between the tire case 17 and the reinforcing cord layer 28 compared to the case where the reinforcing cord 26 is fixed with cushion rubber. Therefore, the reinforcing cord 26 can be further adhered and fixed to the tire case 17. Thereby, the above-mentioned air entering can be prevented effectively, and it can control effectively that a reinforcement cord member moves at the time of driving.

  Furthermore, when the reinforcing cord is a steel cord, the reinforcing cord 26 can be easily separated and recovered from the thermoplastic resin material by heating at the time of disposal of the tire, which is advantageous in terms of recyclability of the tire 10. In addition, the resin material usually has a lower loss coefficient (Tan δ) than vulcanized rubber. For this reason, if the reinforcing cord layer contains a large amount of resin material, the rolling property of the tire can be improved. Furthermore, a resin material having a relatively high elastic modulus as compared with vulcanized rubber has an advantage that the in-plane shear rigidity is large and the stability and wear resistance during running of the tire are excellent.

In addition, since the tread 30 that is in contact with the road surface is made of a rubber material that is more wear resistant than the thermoplastic resin material, the wear resistance of the tire 10 is improved.
Further, since an annular bead core 18 made of a metal material is embedded in the bead portion 12, the tire case 17, that is, the tire 10 is strong against the rim 20 like the conventional rubber pneumatic tire. Retained.

  Furthermore, since a seal layer 24 made of a rubber material having a sealing property rather than a thermoplastic resin material is provided in a portion that contacts the rim 20 of the bead portion 12, a seal between the tire 10 and the rim 20 is provided. Improves. For this reason, the air leak in a tire is further suppressed compared with the case where it seals with the rim | limb 20 and a thermoplastic resin material. Further, the rim fit property is improved by providing the seal layer 24.

  In the above-described embodiment, the reinforcing cord 26 is heated and the thermoplastic resin material in a portion where the heated reinforcing cord 26 contacts is melted or softened. However, the present invention is not limited to this configuration, and the reinforcing cord 26 After heating the outer peripheral surface of the crown portion 16 in which the reinforcing cord 26 is embedded without using the hot air generator, the reinforcing cord 26 may be embedded in the crown portion 16.

  In the first embodiment, the heat source of the cord heating device 59 is a heater and a fan. However, the present invention is not limited to this configuration, and the reinforcement cord 26 is directly heated by radiant heat (for example, infrared rays). Also good.

  Further, in the first embodiment, the portion in which the thermoplastic resin material in which the reinforcing cord 26 is embedded is melted or softened is forcibly cooled by the metal second roller 64, but the present invention is configured in this manner. However, the present invention may be configured to forcibly cool and solidify the melted or softened portion of the thermoplastic resin material by directly blowing cold air to the melted or softened portion of the thermoplastic resin material.

  In the first embodiment, the reinforcement cord 26 is heated. However, for example, the outer periphery of the reinforcement cord 26 may be covered with the same thermoplastic resin material as the tire case 17. When the covering reinforcing cord is wound around the crown portion 16 of the tire case 17, the thermoplastic resin material covered with the reinforcing cord 26 is also heated, thereby effectively suppressing air entry when embedded in the crown portion 16. it can.

  Further, although it is easy to manufacture the reinforcing cord 26 in a spiral manner, a method of making the reinforcing cord 26 discontinuous in the width direction is also conceivable.

  The tire 10 of the first embodiment is a so-called tubeless tire in which an air chamber is formed between the tire 10 and the rim 20 by attaching the bead portion 12 to the rim 20, but the present invention has this configuration. It is not limited and a perfect tube shape may be sufficient.

  As the complete tube-shaped tire, for example, as shown in FIG. 4, three annular tire skeleton bodies may be arranged in the tire width direction. FIG. 4 is a cross-sectional view of a tire according to another embodiment. As shown in FIG. 4, the tire 86 includes a tread rubber layer 87, a hollow tube (tire frame) 88 made of a resin material similar to that of the first embodiment, and a belt (reinforcing cord). 89 and a rim 90 are provided. Three tubes 88 are arranged side by side in the tire width direction of the tire 86. A tread rubber layer 87 in which a belt 89 is embedded is bonded to the outer periphery of the tube 88. The tube 88 is attached to a rim 90 having a recess that engages with the tube 88. The tire 86 is not provided with a bead core.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

[Second Embodiment]
Next, a tire manufacturing method and a second embodiment of the tire according to the present invention will be described with reference to the drawings. Similar to the first embodiment, the tire according to the present embodiment has substantially the same cross-sectional shape as that of a conventional general rubber pneumatic tire. For this reason, in the following figures, the same number is attached | subjected about the structure similar to the said 1st Embodiment. FIG. 5A is a cross-sectional view along the tire width direction of the tire of the second embodiment, and FIG. 5B is a bead portion in a state where a rim is fitted to the tire of the second embodiment. It is an enlarged view of a section along the tire width direction. FIG. 6 is a cross-sectional view along the tire width direction showing the periphery of the reinforcing layer of the tire of the second embodiment.

  In the tire of the second embodiment, the tire case 17 is composed of a polyamide-based thermoplastic elastomer (“UBESTA, XPA9055X1” manufactured by Ube Industries, Ltd.) and a specific copolymer (Mitsui, An ethylene-methacrylic acid copolymer “Nucleel, N035C” manufactured by DuPont Polychemical Co., Ltd. and a specific acid-modified copolymer (an acid modified product “HPR” of an ethylene-acrylate ethyl ester copolymer manufactured by Mitsui DuPont Polychemical Co. , AR2011 "), and a thermoplastic resin material. In the present embodiment, as shown in FIGS. 5 and 6, the tire 200 includes a reinforcing cord layer 28 (indicated by a broken line in FIG. 6) formed by winding a covering cord member 26 </ b> B around the crown portion 16 in the circumferential direction. Are stacked). The reinforcing cord layer 28 constitutes the outer peripheral portion of the tire case 17 and reinforces the circumferential rigidity of the crown portion 16. The outer peripheral surface of the reinforcing cord layer 28 is included in the outer peripheral surface 17S of the tire case 17.

  The covering cord member 26B is formed by coating a covering resin material 27 that is separate from the thermoplastic resin material forming the tire case 17 on the cord member 26A having higher rigidity than the thermoplastic resin material forming the tire case 17. Is formed. Further, the covering cord member 26B is joined (for example, welded or adhered with an adhesive) at the contact portion with the crown portion 16 where the covering cord member 26B and the crown portion 16 are joined.

  The elastic modulus of the coating resin material 27 is preferably set in the range of 0.1 to 10 times the elastic modulus of the resin material forming the tire case 17. When the elastic modulus of the coating resin material 27 is 10 times or less than the elastic modulus of the thermoplastic resin material forming the tire case 17, the crown portion does not become too hard and rim assembly is facilitated. When the elastic modulus of the coating resin material 27 is 0.1 times or more of the elastic modulus of the thermoplastic resin material forming the tire case 17, the resin constituting the reinforcing cord layer 28 is not too soft and the belt surface Excellent internal shear rigidity and improved cornering force. In the present embodiment, the same material as the thermoplastic resin material as the coating resin material 27 (in this embodiment, a polyamide-based thermoplastic elastomer (“UBESTA, XPA9055X1” manufactured by Ube Industries, Ltd.)) and a specific copolymer ( An ethylene-methacrylic acid copolymer “Nucleel, N035C” manufactured by Mitsui DuPont Polychemical Co., Ltd.) and a specific acid-modified copolymer (an acid modified product of an ethylene-acrylate ethyl ester copolymer produced by Mitsui DuPont Polychemical Co. Thermoplastic resin material composed of a mixed material with “HPR, AR2011”) is used.

  Further, as shown in FIG. 6, the coated cord member 26B has a substantially trapezoidal cross-sectional shape. In the following description, the upper surface (the surface on the outer side in the tire radial direction) of the covering cord member 26B is denoted by reference numeral 26U, and the lower surface (the surface on the inner side in the tire radial direction) is denoted by reference numeral 26D. In the present embodiment, the cross-sectional shape of the covering cord member 26B is a substantially trapezoidal shape. However, the present invention is not limited to this configuration, and the cross-sectional shape is from the lower surface 26D side (the tire radial direction inner side) to the upper surface 26U. Any shape may be used as long as the shape excluding the shape that becomes wider toward the side (the tire radial direction outer side).

  As shown in FIG. 6, since the covering cord members 26B are arranged at intervals in the circumferential direction, a gap 28A is formed between the adjacent covering cord members 26B. For this reason, the outer peripheral surface of the reinforcing cord layer 28 is uneven, and the outer peripheral surface 17S of the tire case 17 in which the reinforcing cord layer 28 forms the outer peripheral portion is also uneven.

  On the outer peripheral surface 17S (including unevenness) of the tire case 17, fine roughened unevenness is uniformly formed, and a cushion rubber 29 is bonded thereon via a bonding agent. In the cushion rubber 29, the radially inner rubber portion flows into the roughened irregularities.

  In addition, a tread 30 made of a material having higher wear resistance than the resin material forming the tire case 17, for example, rubber, is joined on the cushion rubber 29 (outer peripheral surface).

  The rubber used for the tread 30 (tread rubber 30A) is preferably the same type of rubber as that used for conventional rubber pneumatic tires. Instead of the tread 30, a tread formed of another type of resin material that is more excellent in wear resistance than the resin material forming the tire case 17 may be used. Further, the tread 30 is formed with a tread pattern (not shown) including a plurality of grooves on the ground contact surface with the road surface, similarly to the conventional rubber pneumatic tire.

Next, the manufacturing method of the tire of this embodiment is demonstrated.
(Tire frame formation process)
(1) First, the tire case half body 17A is formed in the same manner as in the first embodiment described above, and this is heated and pressed by a joining mold to form the tire case 17.

(Reinforcement cord member winding process)
(2) The tire manufacturing apparatus in the present embodiment is the same as that in the first embodiment described above. In the cord supply apparatus 56 shown in FIG. 3 of the first embodiment described above, the cord member 26A is attached to the reel 58. A material obtained by winding a covering cord member 26B having a substantially trapezoidal cross-sectional shape, which is covered with a covering resin material 27 (a thermoplastic material in this embodiment), is used.

  First, the temperature of the heater 70 is raised, and the ambient air heated by the heater 70 is sent to the heating box 74 by the wind generated by the rotation of the fan 72. The coated cord member 26B unwound from the reel 58 is fed into the heating box 74 in which the internal space is heated with hot air (for example, the temperature of the outer peripheral surface of the coated cord member 26B is equal to or higher than the melting point of the coating resin material 27). And Here, when the covering cord member 26B is heated, the covering resin material 27 is melted or softened.

  The covering cord member 26B is spirally wound around the outer peripheral surface of the crown portion 16 of the tire case 17 that rotates in the front direction of the paper through the discharge port 76 with a certain tension. At this time, the lower surface 26 </ b> D of the covering cord member 26 </ b> B contacts the outer peripheral surface of the crown portion 16. Then, the molten or softened covering resin material 27 in the contacted portion spreads on the outer peripheral surface of the crown portion 16, and the covering cord member 26 </ b> B is welded to the outer peripheral surface of the crown portion 16. Thereby, the joint strength between the crown portion 16 and the covering cord member 26B is improved.

(Roughening process)
(3) Next, with a blasting device (not shown), the projection material is injected at high speed onto the outer peripheral surface 17S while rotating the tire case 17 side toward the outer peripheral surface 17S of the tire case 17. The ejected projection material collides with the outer peripheral surface 17S, and fine roughening unevenness 96 having an arithmetic average roughness Ra of 0.05 mm or more is formed on the outer peripheral surface 17S.
Thus, by forming the fine roughening unevenness 96 on the outer peripheral surface 17S of the tire case 17, the outer peripheral surface 17S becomes hydrophilic, and the wettability of the bonding agent described later is improved.

(Lamination process)
(4) Next, a bonding agent is applied to the outer peripheral surface 17S of the tire case 17 subjected to the roughening treatment.
The bonding agent is not particularly limited, such as a rubber adhesive such as a halogenated rubber adhesive (for example, a chlorinated rubber adhesive), a triazine thiol adhesive, a phenol resin adhesive, an isocyanate adhesive, etc. However, it is preferable to react at a temperature (90 ° C. to 140 ° C.) at which the cushion rubber 29 can be vulcanized.

(5) Next, the unvulcanized cushion rubber 29 is wound around the outer peripheral surface 17S to which the bonding agent has been applied for one round, and a bonding agent such as a rubber cement composition is applied on the cushion rubber 29, for example. Then, a vulcanized or semi-vulcanized tread rubber 30A is wound for one turn to obtain a raw tire case state.

(Vulcanization process)
(6) Next, the raw tire case is accommodated in a vulcanizing can or mold and vulcanized. At this time, the unvulcanized cushion rubber 29 flows into the roughened irregularities 96 formed on the outer peripheral surface 17S of the tire case 17 by the roughening treatment. When the vulcanization is completed, the anchor rubber is exerted by the cushion rubber 29 flowing into the roughened unevenness 96, and the bonding strength between the tire case 17 and the cushion rubber 29 is improved. That is, the bonding strength between the tire case 17 and the tread 30 is improved via the cushion rubber 29.

(8) Then, if the seal layer 24 made of a soft material softer than the resin material is bonded to the bead portion 12 of the tire case 17 using an adhesive or the like, the tire 200 is completed.

(Function)
In the tire 200 of the present embodiment, since the tire case 17 is formed of a thermoplastic resin material, it is excellent in impact resistance and breakability. For this reason, when the tire 10 of the present embodiment is applied to an automobile, the durability is excellent.
Furthermore, since the tire structure can be simplified, the weight is light compared to conventional rubber. For this reason, since the tire 200 of this embodiment can be reduced in weight, the fuel consumption of the motor vehicle using this tire can be improved.

  Further, when the reinforcing cord layer 28 includes the covering cord member 26B, the hardness of the tire case 17 and the reinforcing cord layer 28 is higher than that in the case where the reinforcing cord 26A is simply fixed by the cushion rubber 29. Since the difference can be reduced, the covering cord member 26B can be further adhered and fixed to the tire case 17. Thereby, the above-mentioned air entering can be prevented effectively, and it can control effectively that a reinforcement cord member moves at the time of driving.

  Further, when the reinforcing cord is a steel cord, the cord member 26A can be easily separated and recovered from the coated cord member 26B by heating at the time of disposal of the tire, which is advantageous in terms of the recyclability of the tire 200. In addition, the resin material usually has a lower loss coefficient (Tan δ) than vulcanized rubber. For this reason, if the reinforcing cord layer contains a large amount of resin material, the rolling property of the tire can be improved. Furthermore, a resin material having a relatively high elastic modulus as compared with vulcanized rubber has an advantage that the in-plane shear rigidity is large and the stability and wear resistance during running of the tire are excellent.

  In the tire manufacturing method of the present embodiment, since the outer peripheral surface 17S of the tire case 17 is roughened when the tire case 17, the cushion rubber 29, and the tread rubber 30A are integrated, the bondability is achieved by the anchor effect. (Adhesiveness) is improved. Further, since the resin material forming the tire case 17 is dug up by the collision of the projection material, the wettability of the bonding agent is improved. Thereby, the bonding agent is held in a uniform applied state on the outer peripheral surface 17S of the tire case 17, and the bonding strength between the tire case 17 and the cushion rubber 29 can be ensured.

  In particular, even when the outer peripheral surface 17S of the tire case 17 is uneven, the projection case is collided with the projection (gap 28A) to roughen the periphery of the recess (concave wall, bottom), so that the tire case 17 The bonding strength between the cushion rubber 29 and the cushion rubber 29 can be ensured.

  On the other hand, since the cushion rubber 29 is laminated in the roughened region of the outer peripheral surface 17S of the tire case 17, the bonding strength between the tire case 17 and the cushion rubber can be effectively ensured.

  In the vulcanization step, when the cushion rubber 29 is vulcanized, the cushion rubber 29 flows into the roughened irregularities 96 formed on the outer peripheral surface 17S of the tire case 17 by the roughening process. When the vulcanization is completed, the anchor rubber is exerted by the cushion rubber 29 flowing into the roughened unevenness 96, and the bonding strength between the tire case 17 and the cushion rubber 29 is improved.

  The tire 200 manufactured by such a tire manufacturing method ensures the bonding strength between the tire case 17 and the cushion rubber 29, that is, the bonding between the tire case 17 and the tread 30 via the cushion rubber 29. Strength is secured. Thereby, the peeling between the outer peripheral surface 17S of the tire case 17 of the tire 200 and the cushion rubber 29 is suppressed during traveling or the like.

  Further, since the outer peripheral portion of the tire case 17 is configured by the reinforcing cord layer 28, the puncture resistance and the cut resistance are improved as compared with the outer peripheral portion configured by other than the reinforcing cord layer 28. To do.

  Further, since the reinforcing cord layer 28 is formed by winding the covering cord member 26B, the circumferential rigidity of the tire 200 is improved. By improving the circumferential rigidity, creep of the tire case 17 (a phenomenon in which plastic deformation of the tire case 17 increases with time under a constant stress) is suppressed, and pressure resistance against air pressure from the inner side in the tire radial direction is suppressed. improves.

In this embodiment, although the unevenness | corrugation was comprised in the outer peripheral surface 17S of the tire case 17, this invention is not restricted to this, It is good also as a structure which forms the outer peripheral surface 17S flatly.
In addition, the tire case 17 may be formed with a reinforcing cord layer so as to cover the covering cord member wound and joined to the crown portion of the tire case with a covering thermoplastic material. In this case, the coating thermoplastic material can be ejected onto the reinforcing cord layer 28 in the molten or softened state to form the coating layer. Further, without using an extruder, the welding sheet may be heated to be in a molten or softened state and attached to the surface (outer peripheral surface) of the reinforcing cord layer 28 to form a coating layer.

  In the second embodiment described above, the case divided body (the tire case half body 17A) is joined to form the tire case 17. However, the present invention is not limited to this configuration, and the tire is formed using a mold or the like. The case 17 may be integrally formed.

  The tire 200 of the second embodiment is a so-called tubeless tire in which an air chamber is formed between the tire 200 and the rim 20 by attaching the bead portion 12 to the rim 20, but the present invention has this configuration. Without being limited, the tire 200 may be, for example, a complete tube shape (for example, the shape shown in FIG. 4).

  In the second embodiment, the cushion rubber 29 is disposed between the tire case 17 and the tread 30. However, the present invention is not limited to this, and the cushion rubber 29 may not be disposed.

  In the second embodiment, the covering cord member 26B is spirally wound around the crown portion 16. However, the present invention is not limited thereto, and the covering cord member 26B is discontinuous in the width direction. It is good also as a structure wound around.

In the second embodiment, the coating resin material 27 forming the coating cord member 26B is made of a thermoplastic material, and the coating resin material 27 is heated to be melted or softened so that the outer peripheral surface of the crown portion 16 is coated. Although the cord member 26B is welded, the present invention is not limited to this configuration, and the covering cord member 26B is bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like without heating the coating resin material 27. It is good also as composition to do.
The covering resin material 27 for forming the covering cord member 26B may be a thermosetting resin, and the covering cord member 26B may be bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like without being heated.
Further, the covering resin material 27 for forming the covering cord member 26B may be a thermosetting resin, and the tire case 17 may be formed of a thermoplastic resin material. In this case, the covering cord member 26B may be bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like, and the portion of the tire case 17 where the covering cord member 26B is disposed is heated to be melted or softened. The covering cord member 26 </ b> B may be welded to the outer peripheral surface of the crown portion 16 in a state.
Further, the covering resin material 27 for forming the covering cord member 26B may be made of a thermoplastic material, and the tire case 17 may be made of a thermoplastic resin material. In this case, the covering cord member 26B may be bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like, and the portion of the tire case 17 where the covering cord member 26B is disposed is heated to be melted or softened. The coating resin material 27 may be heated to a molten or softened state while the coating cord member 26 </ b> B is welded to the outer peripheral surface of the crown portion 16. In addition, when both the tire case 17 and the covering cord member 26B are heated and melted or softened, the two are mixed well, so that the bonding strength is improved. When both the resin material forming the tire case 17 and the covering resin material 27 forming the covering cord member 26B are thermoplastic resin materials, the same kind of thermoplastic material, particularly the same thermoplastic material is used. It is preferable.

  Further, the outer peripheral surface 17S of the tire case 17 subjected to the roughening treatment is activated by corona treatment, plasma treatment, or the like to activate the surface of the outer peripheral surface 17S and increase the hydrophilicity, and then apply an adhesive. Also good.

Furthermore, the order for manufacturing the tire 200 is not limited to the order of the second embodiment, and may be changed as appropriate.
The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

  As mentioned above, although the specific aspect of this invention was demonstrated using 1st Embodiment and 2nd Embodiment, this invention is not limited to the above-mentioned aspect.

As shown in the first embodiment, the tire of the present invention can be configured as follows.
(1-1) The tire of the present invention is a cross-sectional view along the axial direction of the tire skeleton, and at least a part of the reinforcing cord member on the outer periphery of the tire skeleton formed of the thermoplastic resin material according to the present invention. Can be configured to be embedded.
As described above, when a part of the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body, it is possible to further suppress a phenomenon (air entering) in which air remains around the cord when the reinforcing cord member is wound. When the entry of air into the periphery of the reinforcement cord member is suppressed, the movement of the reinforcement cord member due to input during traveling is suppressed. Thereby, for example, when the tire constituent member is provided on the outer peripheral portion of the tire skeleton body so as to cover the entire reinforcement cord member, the movement of the reinforcement cord member is suppressed. ) Is prevented from being peeled off and the durability is improved.

(1-2) The tire of the present invention may be provided with a tread formed of a material that is more wear resistant than the thermoplastic resin material on the radially outer side of the reinforcing cord layer.
Thus, the abrasion resistance of the tire can be further improved by configuring the tread that contacts the road surface with a material that is more resistant to abrasion than the thermoplastic resin material.

(1-3) In the tire according to the present invention, in a cross-sectional view along the axial direction of the tire frame body, a diameter 1/5 or more of the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body along the circumferential direction. Can be made.
Thus, when 1/5 or more of the diameter of the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body in a cross-sectional view along the axial direction of the tire frame body, it is effective to enter the air around the reinforcing cord member It is possible to suppress the movement of the reinforcing cord member due to an input during traveling.

(1-4) In the tire according to the present invention, the tire frame has a bead portion in contact with a rim bead sheet and a rim flange on a radially inner side, and an annular bead core made of a metal material is embedded in the bead portion. Can be configured.
Thus, by providing a bead portion that is a fitting portion with the rim in the tire frame body, and further by embedding an annular bead core made of a metal material in this bead portion, it is the same as a conventional rubber pneumatic tire. In addition, the tire frame (that is, the tire) can be firmly held against the rim.

(1-5) In the tire of the present invention, a seal portion made of a material having higher sealing properties (adhesion with the rim) than the thermoplastic resin material can be provided at a portion where the bead portion contacts the rim. .
Thus, by providing a seal portion made of a material having a higher sealing property than the thermoplastic resin material at the contact portion between the tire frame body and the rim, adhesion between the tire (tire frame body) and the rim can be improved. Can be improved. Thereby, compared with the case where only a rim | limb and a thermoplastic resin material are used, the air leak in a tire can be suppressed further. Moreover, the rim fit property of a tire can also be improved by providing the said seal part.

(1-6) The tire manufacturing method of the present invention includes at least a polyamide-based thermoplastic elastomer (for example, “UBESTA, XPA9055X1” manufactured by Ube Industries, Ltd.) and a specific copolymer (for example, manufactured by Mitsui DuPont Polychemical Co., Ltd.). Ethylene-methacrylic acid copolymer “Nuclele, N035C”) and a specific acid-modified copolymer (for example, acid-modified “HPR, AR2011” of an ethylene-acrylate ethyl ester copolymer manufactured by Mitsui DuPont Polychemical Co., Ltd.) And a tire frame piece forming step of forming a tire frame piece constituting a part of the annular tire frame body with a thermoplastic resin material, and a pair of two by applying heat to the joint surface of the tire frame piece A tire frame piece joining step of forming the tire frame body by fusing the tire frame pieces, and The reinforcing cord member winding step of forming a peripheral portion reinforcing cord layer by winding a reinforcing cord member circumferentially, can be constituted by.
As described above, a thermoplastic resin material containing a polyamide-based thermoplastic elastomer, a specific copolymer, and a specific acid-modified copolymer has excellent fluidity and can be easily injection-molded. Therefore, when forming the tire skeleton piece that constitutes a part of the annular tire skeleton using the thermoplastic resin material according to the present invention, if the tire skeleton piece is formed by injection molding, the tire skeleton piece can be efficiently obtained. It can be formed and is excellent in tire productivity.

(1-7) The tire manufacturing method is configured so that, in the tire frame piece bonding step, a bonding surface of the tire frame piece is heated to a temperature equal to or higher than a melting point of the thermoplastic resin material forming the tire frame piece. Can do.
As described above, when the joining surface of the divided body is heated to a temperature equal to or higher than the melting point of the thermoplastic resin material constituting the tire frame piece, the tire frame pieces can be sufficiently fused with each other. The productivity of the tire can be increased while improving.

(1-8) In the tire manufacturing method, in the reinforcing cord member winding step, at least one of the reinforcing cord members while melting or softening an outer peripheral portion of the tire frame body formed in the tire frame piece joining step. The reinforcing cord member can be wound around the outer peripheral portion of the tire frame body by burying the portion.
In this way, at least a part of the reinforcing cord member was embedded while melting or softening the outer peripheral portion of the tire frame body, and the reinforcing cord member was wound around the outer peripheral portion of the tire frame body. At least a part of the reinforcing cord member can be welded to the molten or softened thermoplastic resin material. Thereby, the air entering between the outer peripheral part of the tire frame and the reinforcing cord member can be further suppressed in a cross-sectional view along the axial direction of the tire frame. Moreover, when the portion in which the reinforcing cord member is embedded is cooled and solidified, the fixing degree of the reinforcing cord member embedded in the tire frame body is improved.

(1-9) In the tire manufacturing method, in the reinforcing cord member winding step, 1/5 or more of the diameter of the reinforcing cord in the tire cord body in a cross-sectional view along the axial direction of the tire frame body. It can comprise so that it may embed | buy in an outer peripheral part.
As described above, when the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body by 1/5 or more of the diameter in a cross-sectional view along the axial direction of the tire frame body, it is effective for the air to enter the periphery of the reinforcement cord during manufacturing In addition, the embedded reinforcing cord member can be made difficult to come off from the tire frame body.

(1-10) The tire manufacturing method may be configured to embed the heated reinforcing cord member in the tire frame body in the reinforcing cord member winding step.
Thus, in the reinforcing cord winding step, when the reinforcing cord member is embedded in the tire frame body while heating, the contact portion melts or softens when the heated reinforcing cord member contacts the outer periphery of the tire frame body. Therefore, the reinforcing cord member can be easily embedded in the outer peripheral portion of the tire frame body.

(1-11) The tire manufacturing method may be configured to heat a portion of the outer periphery of the tire frame body where the reinforcing cord member is embedded in the cord member winding step.
Thus, by heating the portion where the reinforcement cord member is embedded in the outer peripheral portion of the tire frame body, the heated portion of the tire frame body is melted or softened, so that the reinforcement cord member is easily embedded.

(1-12) In the manufacturing method of the tire, in the cord member winding step, the reinforcing cord is pressed in a circumferential direction of the outer peripheral portion of the tire frame body while pressing the reinforcing cord member against the outer peripheral portion of the tire frame body. The member can be configured to be spirally wound.
As described above, when the reinforcing cord member is spirally wound while pressing the reinforcing cord member against the outer peripheral portion of the tire frame body, the amount of the reinforcing cord member embedded in the outer peripheral portion of the tire frame body can be adjusted. it can.

(1-13) According to the manufacturing method, in the cord member winding step, after the reinforcing cord member is wound around the tire frame body, a melted or softened portion of the outer peripheral portion of the tire frame body is cooled. Can be configured to.
In this way, after the reinforcing cord member is embedded, the melted or softened portion of the outer periphery of the tire frame body is forcibly cooled to naturally cool the melted or softened portion of the outer periphery of the tire frame body. Faster and faster cooling and solidification. By cooling the tire outer peripheral portion faster than natural cooling, it is possible to suppress deformation of the outer peripheral portion of the tire frame body and to suppress movement of the reinforcing cord member.

In addition, as described in the second embodiment, the tire of the present invention can be configured as follows.
(2-1) The tire of the present invention may further include a roughening treatment step in which the outer peripheral surface of the tire frame body is roughened by causing the particulate projection material to collide with the outer peripheral surface of the tire frame body in the manufacturing method. And a laminating step of laminating a tire constituent rubber member on the roughened outer peripheral surface via a bonding agent.
As described above, when the roughening treatment step is provided, the particulate projection material collides with the outer peripheral surface of the annular tire skeleton formed using the thermoplastic resin material, and fine rough unevenness is formed on the outer peripheral surface. Is formed. In addition, the process which makes a projection material collide with the outer peripheral surface of a tire frame body and forms fine roughening unevenness | corrugation is called roughening process. Thereafter, a tire constituting rubber member is laminated on the outer peripheral surface subjected to the roughening treatment via a bonding agent. Here, since the outer peripheral surface of the tire frame is roughened when integrating the tire frame and the tire constituent rubber member, the bondability (adhesiveness) is improved by the anchor effect. In addition, since the resin material forming the tire frame is dug up by the collision of the projection material, the wettability of the outer peripheral surface is improved. Thereby, the bonding agent is held in a uniform applied state on the outer peripheral surface of the tire frame body, and the bonding strength between the tire frame body and the tire constituting rubber member can be ensured.

(2-2) In the tire of the present invention, at least a part of the outer peripheral surface of the tire frame body is an uneven portion, and the uneven portion can be manufactured by performing a roughening treatment in the roughening treatment step.
As described above, even when at least a part of the outer peripheral surface of the tire skeleton is an uneven portion, the projection material is collided with the uneven portion to roughen the periphery of the recessed portion (concave wall, concave bottom), and the tire Bonding strength between the skeleton body and the tire constituting rubber member can be ensured.

(2-3) In the tire according to the present invention, the outer peripheral portion of the tire frame body is formed of a reinforcing layer that forms the uneven portion on the outer peripheral surface, and the reinforcing layer forms the tire frame body. Can be configured by winding a covering cord member formed by covering a reinforcing cord with the same or different resin material in the circumferential direction of the tire frame body.
Thus, the circumferential direction rigidity of a tire frame body can be improved by constituting the perimeter part of a tire frame body with the reinforcement layer constituted by winding a covering cord member in the circumferential direction of a tire frame body.

(2-4) The tire of this invention can use a thermoplastic resin material for the resin material which comprises the said covering cord member.
In this way, by using a thermoplastic material having thermoplasticity as the resin material constituting the coated cord member, the tire can be easily manufactured and recycled as compared with the case where a thermosetting material is used as the resin material. It becomes easy.

(2-5) The tire of the present invention can be configured to roughen a wider area than the laminated area of the tire constituent rubber members in the roughening treatment step.
As described above, in the roughening treatment step, when the roughening treatment is performed on a region wider than the lamination region of the tire constituent rubber members, the bonding strength between the tire frame body and the tire constituent rubber members can be reliably ensured.

(2-6) The tire of the present invention can be configured to roughen the outer peripheral surface so that the arithmetic average roughness Ra is 0.05 mm or more in the roughening treatment step.
As described above, when the outer peripheral surface of the tire frame body is roughened so that the arithmetic average roughness Ra is 0.05 mm or more in the roughening treatment step, the outer peripheral surface subjected to the roughening treatment, for example, via a bonding agent, When the unvulcanized or semi-cured tire component rubber member is laminated and vulcanized, the rubber of the tire component rubber member can be poured to the bottom of the roughened irregularities formed by the roughening treatment. When the rubber of the tire constituent rubber member is poured into the bottom of the roughened unevenness, a sufficient anchor effect is exerted between the outer peripheral surface and the tire constituent rubber member, and the bonding strength between the tire skeleton and the tire constituent rubber member Can be improved.

(2-7) In the tire of the present invention, unvulcanized or semi-vulcanized rubber can be used as the tire constituent rubber member.
As described above, when an unvulcanized or semi-vulcanized rubber is used as the tire constituent rubber member, when the tire constituent rubber member is vulcanized, a roughening process formed on the outer peripheral surface of the tire frame body. Rubber flows into the uneven surface. When the vulcanization is completed, the anchor effect is exhibited by the rubber (vulcanized) that has flowed into the roughened unevenness, and the bonding strength between the tire frame body and the tire constituting rubber member can be improved.

  In addition, vulcanized means the state that has reached the degree of vulcanization required for the final product, and the semi-vulcanized state has a higher degree of vulcanization than the unvulcanized state, but is required for the final product. This means that the degree of vulcanization is not reached.

(2-8) The tire of the present invention is an annular tire skeleton formed by using the thermoplastic resin material according to the present invention, and having the outer peripheral surface roughened by colliding a particulate projection material with the outer peripheral surface. And a tire constituting rubber member laminated on the roughened outer peripheral surface via a bonding agent.
As described above, when the roughened tire skeleton body is used, the bonding strength between the tire skeleton body and the tire constituting rubber member can be improved by the anchor effect. Moreover, since the outer peripheral surface is roughened, the wettability of the bonding agent is good. As a result, the bonding agent is held in a uniform application state on the outer peripheral surface of the tire frame body, the bonding strength between the tire frame body and the tire component rubber member is ensured, and the tire frame body and the tire component rubber member are separated. Can be suppressed.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to this.
First, tires of examples and comparative examples were molded according to the second embodiment described above. At this time, the materials described in Table 1 below were used as materials for forming the tire case. Moreover, about each Example and the comparative example, the tire performance was considered from the physical property evaluation of material.

<Preparation of sample piece>
1. Polyamide-based thermoplastic elastomer Ube Industries, UBESTA, XPA 9055X1

2. Ethylene-methacrylic acid copolymer (specific copolymer)
Mitsui DuPont Polychemical Co., Ltd., Nukurel, N035C
Mitsui / DuPont Polychemical Co., Ltd., Nuclele, AN42115C

3. Ethylene-acrylate ethyl ester copolymer (specific acid-modified copolymer)
Mitsui DuPont Polychemicals, HPR, AR2011

[Preparation of pellets]
The above elastomer and ethylene-acrylate copolymer were mixed (mass basis) with the composition shown in Table 1, and kneaded with a LABOPLASTOMILL 50MR twin screw extruder manufactured by Toyo Seiki Seisakusho to obtain pellets. In Comparative Example 1, polyamide thermoplastic elastomer pellets were prepared without using a mixed system.

<1. Evaluation of Tensile Strength, Breaking Elongation, Tensile Elastic Modulus, and Breaking State>
Using the prepared pellets, SE30D manufactured by Sumitomo Heavy Industries, Ltd. is used for injection molding to obtain a molding temperature of 200 ° C. to 240 ° C., a mold temperature of 50 ° C. to 70 ° C., 12.7 mm × 127 mm, thickness 1.6 mm. A sample piece was obtained using the mold.
Each sample piece was punched out to produce a dumbbell-shaped sample piece (No. 5 type sample piece) defined in JISK6251-1993.
In addition, about the pellet of the comparative example 2, since injection molding was not able to be carried out on the said injection molding conditions, by using the electric heating press by Kodaira Seisakusho Co., Ltd., heating a pellet at 200 degreeC 12MPa for 5 minutes. Then, a hot press was performed to obtain a sample piece of 120 mm × 120 mm and a thickness of 2 mm.

  Next, using a Shimadzu Autograph AGS-J (5KN) manufactured by Shimadzu Corporation, the tensile speed was set to 200 mm / min. I checked the condition. The results are shown in Table 1 below.

The fracture state was evaluated based on the following evaluation criteria by visually observing the cross section of the sample piece.
-Evaluation criteria-
○: The sample piece was broken by ductile fracture.
Δ: The sample piece was broken by layered fracture.
X: The sample piece was broken by brittle fracture.

<2. Fluidity evaluation [MFR (g / 10 min, 230 ° C.)]>
About each pellet of an Example and a comparative example, the load of 21.18N, 49.03N, or 98.07N was applied based on ASTM A1238 (B method) using the semi-melt indexer 2A type made by Toyo Seiki Seisakusho Co., Ltd. The fluidity (MFR) was measured. The results are shown in Table 1. The measurement was started with a small load (21.18N), and when the MFR could not be measured under these conditions, the measurement was performed with a larger load. “−” Is shown in the table for those for which the measurement is not started after 3 minutes have elapsed since the start of the measurement.

  As shown in Table 1, the sample pieces produced in each example have a smaller elastic modulus in comparison with the sample pieces produced in the comparative examples and are softened. It is understood that when a tire is formed using the same thermoplastic resin material, the tire can be excellent in impact resistance. Furthermore, from the evaluation result of the fracture state, the sample piece prepared in the example was ductile fracture. Therefore, it is assumed that a tire formed using the same thermoplastic resin material as that of the sample piece is not easily cracked even if the tire is damaged, and is excellent in breakability.

Moreover, all the sample pieces produced in each Example were excellent in fluidity. Therefore, it is understood that if the same thermoplastic resin material as that of the sample piece is used, injection molding can be easily performed, the tire can be manufactured efficiently, and the tire productivity can be improved.
In addition, when the drum running test was done about each tire formed using the thermoplastic resin material of the same composition as each sample piece of an Example and a comparative example, the safety | security on running did not have any problem.

10, 200 Tire 12 Bead part 16 Crown part (outer peripheral part)
18 Bead core 20 Rim 21 Bead sheet 22 Rim flange 17 Tire case (tire frame)
24 Seal layer (seal part)
26 Reinforcement cord (reinforcement cord member)
26A cord member (reinforcing cord member)
28 Reinforcing cord layer 30 Tread D Diameter of reinforcing cord (diameter of reinforcing cord member)
L Embedding amount of reinforcement cord (embedding amount of reinforcement cord member)

Claims (6)

At least a tire having an annular tire skeleton formed of a thermoplastic resin material,
The thermoplastic resin material contains a polyamide-based thermoplastic elastomer, an olefin- (meth) acrylic acid copolymer, and an acid-modified copolymer obtained by acid-modifying an olefin- (meth) acrylate copolymer. Tire.   The mass ratio (x: y + z) of the polyamide-based thermoplastic elastomer (x) to the olefin- (meth) acrylic acid copolymer (y) and the acid-modified copolymer (z) is 95: 5 to The tire according to claim 1, which is 50:50.   The total content of the polyamide-based thermoplastic elastomer, the olefin- (meth) acrylic acid copolymer, and the acid-modified copolymer in the thermoplastic resin material is 50% by mass to 100% by mass. The tire according to claim 1 or claim 2.   The olefin- (meth) acrylic acid copolymer is an ethylene- (meth) acrylic acid copolymer, and the acid-modified copolymer is an acid obtained by acid-modifying an ethylene- (meth) acrylate copolymer. The tire according to any one of claims 1 to 3, which is a modified copolymer. A thermoplastic resin material containing at least a polyamide-based thermoplastic elastomer, an olefin- (meth) acrylic acid copolymer, and an acid-modified copolymer obtained by acid-modifying an olefin- (meth) acrylate copolymer. A tire skeleton piece forming step of forming a tire skeleton piece constituting a part of the annular tire skeleton body, and
A tire manufacturing method including a tire skeleton piece joining step of forming a tire skeleton body by applying heat to a joining portion of the tire skeleton pieces to fuse two or more paired tire skeleton pieces together.   The olefin- (meth) acrylic acid copolymer is an ethylene- (meth) acrylic acid copolymer, and the acid-modified copolymer is an acid obtained by acid-modifying an ethylene- (meth) acrylate copolymer. The production method according to claim 5, which is a modified copolymer.