JP2015155303A - tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire which is formed of a resin material, has high elasticity and a low loss coefficient, and is excellent in heat resistance and fracture characteristics.

SOLUTION: A tire is at least formed of a resin material and comprises an annular tire skeleton body. The resin material contains a polyamide-based thermoplastic elastomer having a hard segment and a soft segment in a molecule, and a polystyrene resin. Tensile elasticity (E_PAE) of the polyamide-based thermoplastic elastomer and tensile elasticity (E_PS) of the polystyrene resin satisfy following formula (1). The tire also comprises a reinforcement cord member which is wound around the outer peripheral part of the tire skeleton body in a circumferential direction, and forms a reinforcement cord layer. As the reinforcement cord layer, the tire comprises only a layer having the reinforcement cord member wound in the circumferential direction. The total content of the polyamide-based thermoplastic elastomer and the polystyrene resin in the resin material is equal to 50 mass% or more with respect to the total amount of the resin material. Formula (1): E_PAE<E_PS.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a tire mounted on a rim, and particularly relates to a tire formed at least partially from a thermoplastic material.

  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 Literature 1 and Patent Literature 2 disclose a pneumatic tire molded using a thermoplastic polymer material, particularly a polyester elastomer.

JP 2003-104008 A Japanese Patent Laid-Open No. 03-143701

  A tire using a thermoplastic polymer material is easier to manufacture and lower in cost than a conventional rubber tire. Recently, there are many requests for recycling of used tires. However, since conventional rubber tires have a crosslinked structure in the rubber, they are difficult to recycle, and their recycling applications are limited, such as incineration or crushing and using them for road paving materials. On the other hand, a tire using a thermoplastic polymer material has an advantage that the degree of freedom of use is high from the viewpoint of recycling. Furthermore, even in the case of manufacturing a tire using a polymer material, there is a great demand for productivity because the material can be thermally welded without using a very high temperature from the viewpoint of energy efficiency and capital investment.

  In addition, when manufacturing tires using thermoplastic polymer materials, they achieve performance comparable to conventional rubber tires (required characteristics of tires) while improving manufacturing efficiency and lowering costs. In particular, low fuel consumption tires are required due to environmental problems. The required characteristics of the tire include, for example, an elastic modulus within a certain range, and a mechanical loss coefficient (rolling coefficient: Tanδ () between 30 ° C. and 50 ° C. which is a temperature range when the tire is used. Hereinafter, it may be simply referred to as “Tan δ”.))) Is low, and heat resistance is excellent. However, low tan δ and high elastic modulus are generally in a trade-off relationship in a polymer material. For this reason, development of a tire capable of satisfying these characteristics at a high level is desired.

In particular, in the case of a polyamide-based thermoplastic elastomer, the elastic modulus can be controlled by adjusting the ratio of the soft segment component and the hard segment component. However, generally, when an attempt is made to increase the elastic modulus by adjusting the ratio of the soft segment component and the hard segment component of the polyamide-based thermoplastic elastomer, Tan δ at 30 ° C. to 50 ° C. also increases accordingly.
In addition, in order to satisfy the above-mentioned performance in a trade-off relationship, when controlling the elastic modulus by adjusting the ratio of the soft segment component and the hard segment component, it is necessary to go through complicated steps in the synthesis stage. is there. Furthermore, it is very difficult to synthesize a material having a sufficiently low Tan δ within a temperature range of 30 ° C. to 50 ° C. while having a desired elastic modulus.

  The present invention has been made to solve the above problems, and an object thereof is to provide a tire formed using a thermoplastic polymer material, having high elasticity and a low loss factor, and having excellent productivity. And

(1) The tire of the present invention is a tire formed of at least a resin material and having an annular tire skeleton, wherein the resin material has a polyamide-based thermoplastic elastomer having a hard segment and a soft segment in the molecule; A tensile modulus of elasticity (E _PAE ) of the polyamide-based thermoplastic elastomer and a tensile modulus of elasticity (E _PS ) of the polystyrene-based thermoplastic resin satisfy the following formula (1), and the tire: It has a reinforcing cord member that forms a reinforcing cord layer that is wound in the circumferential direction on the outer periphery of the skeleton body, and has only a layer that has the reinforcing cord member that is wound in the circumferential direction as the reinforcing cord layer, The total content of the polyamide-based thermoplastic elastomer and the polystyrene-based resin in the resin material is 50 quality relative to the total amount of the resin material. It is more than amount%.
Formula (1): E _PAE <E _PS

  In the tire of the present invention, since the tire skeleton is formed of a polyamide-based thermoplastic elastomer and a polystyrene-based resin, the vulcanization process that is an essential process in a conventional rubber tire is not required. A tire frame body can be formed by, for example. Moreover, the polyamide-based thermoplastic elastomer is also excellent in heat-fusibility. For this reason, productivity can be improved by simplifying the manufacturing process, shortening the time, and reducing costs. Furthermore, when the resin material is used for the tire frame, the structure of the tire can be simplified as compared with the conventional rubber tire, and as a result, the weight of the tire can be reduced. For this reason, when formed as a tire skeleton, the wear resistance and durability of the tire can be improved.

The tire skeleton includes a polyamide-based thermoplastic elastomer having a hard segment and a soft segment in a molecule, and a polystyrene resin, and the tensile elasticity modulus (E _PAE ) of the polyamide-based thermoplastic elastomer and the polystyrene resin. The tensile elastic modulus (E _PS ) satisfies the formula (1): E _PAE <E _PS . Here, each “tensile elastic modulus” refers to a tensile elastic modulus specified in JIS K7113: 1995 (hereinafter, unless otherwise specified, “elastic modulus” means the tensile elastic modulus in the present specification). means. The tire of the present invention can increase the elastic modulus of the tire skeleton while suppressing an increase in Tan δ by mixing a polyamide-based thermoplastic elastomer with a polystyrene resin having a higher tensile elastic modulus.

(2) In the tire of the present invention, the resin material may further include a compatibilizer for the polyamide-based thermoplastic elastomer and the polystyrene-based resin (hereinafter sometimes simply referred to as “compatibility”). . According to the tire of the present invention, by further including a compatibilizer in the polyamide thermoplastic elastomer and the polystyrene resin, the interfacial tension between the polyamide thermoplastic elastomer and the polystyrene resin is reduced, and the polystyrene resin The dispersed particle diameter can be reduced. For this reason, the fracture characteristics of the tire can be improved and the elastic modulus can be controlled. The compatibilizer is a resin (including a copolymer) / thermoplastic elastomer / rubber containing the same kind of molecular skeleton as that of either a polyamide-based thermoplastic elastomer or a polystyrene-based resin, and has an interaction with the other. A compound having a substituent (for example, an epoxy group, a carboxyl group, an amino group, or a hydroxyl group) can be used.

(3) In the tire of the present invention, an acid-modified polystyrene thermoplastic elastomer, an epoxy group-modified (meth) acrylic resin, or the like can be used as the compatibilizer. For example, when an acid-modified polystyrene-based thermoplastic elastomer or an epoxy group-modified (meth) acrylic resin (for example, an epoxy group-modified (meth) acrylic acid resin or an epoxy group-modified (meth) acrylate ester) is used as the compatibilizer, Even when it is necessary to finely adjust the elastic modulus of the tire frame body, it is possible to easily adjust the elastic modulus of the tire frame body while suppressing an increase in Tan δ as compared with the case where the polyamide elastomer is used alone. In addition, the breaking characteristics of the tire can be improved.

(4) In the tire of the present invention, a polymer containing a styrene molecular skeleton or a copolymer of styrene and acrylonitrile can be used as the polystyrene resin. Examples of such a resin include a PS resin and an AS resin described later.

(5) The tire of the present invention uses, as the polystyrene resin, an acrylonitrile / butadiene / styrene copolymer or a hydrogenated product thereof; or a blend of acrylonitrile / styrene copolymer and polybutadiene or a hydrogenated product thereof. be able to. Examples of such a resin include an ABS resin and an AES resin described later.

(6) In the tire of the present invention, the resin material may further contain a styrene thermoplastic elastomer. According to the tire of the present invention, by using the styrenic thermoplastic elastomer in combination with the polyamide-based thermoplastic elastomer and the polystyrene-based resin, for example, when it is necessary to finely adjust the elastic modulus of the tire skeleton. However, it is possible to easily adjust the elastic modulus of the tire frame body while suppressing an increase in Tan δ as compared with the case where a polyamide-based thermoplastic elastomer is used alone.
(7) In the tire of the present invention, SEBS described later can be used as the styrene-based thermoplastic elastomer.
(8) In the tire according to the present invention, in the reinforcing cord layer, at least a part of the reinforcing cord member is embedded in an outer peripheral portion of the tire frame body, or the same or different from the resin material forming the tire frame body. The reinforcing cord member may be covered with a resin material.
(9) The tire of the present invention can be configured such that the reinforcing cord member is coated with a coating resin material that is separate from the resin material forming the tire skeleton on the cord member.

  As described above, the tire of the present invention has high elasticity, a low loss factor, and excellent productivity.

(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. It is a graph which shows the relationship between an elasticity modulus and Tan (delta) about each Example and a comparative example.

  Hereinafter, the resin material which comprises the tire frame body in this invention is demonstrated, and the specific embodiment of the tire of this invention is described using figures next.

The tire of the present invention is a tire formed of at least a resin material and having an annular tire skeleton, wherein the resin material includes a polyamide-based thermoplastic elastomer having a hard segment and a soft segment in a molecule, and a polystyrene-based resin. The tensile elastic modulus (E _PAE ) of the polyamide-based thermoplastic elastomer and the tensile elastic modulus (E _PS ) of the polystyrene-based resin satisfy the following formula (1).
Formula (1): E _PAE <E _PS

Here, in this specification, “resin” is a concept including a thermoplastic resin and a thermosetting resin, and does not include natural rubber.
“Thermoplastic elastomer” is a co-polymer having a polymer that forms a crystalline hard segment with a high melting point or a cohesive hard segment and a polymer that forms an amorphous soft segment with a low glass transition temperature. It means a thermoplastic resin material made of coalescence. However, in this specification, “polystyrene thermoplastic elastomer” includes vulcanized synthetic rubber.

In general, in order to improve the elastic modulus of a tire formed using a thermoplastic elastomer, it is conceivable to increase the hard segment content in the elastomer. However, if the hard segment content is increased in order to improve the elastic modulus of the thermoplastic elastomer, the Tan δ of the thermoplastic elastomer also increases accordingly.
In the tire according to the present invention, the resin material forming the tire skeleton includes a polystyrene resin in addition to the polyamide thermoplastic elastomer. For this reason, it is possible to easily achieve a high elastic modulus while keeping Tanδ of the tire frame body low as compared with the case where the ratio of the hard segment is adjusted by using a single polyamide-based thermoplastic elastomer. As a result, a tire having a low rolling resistance and a high elastic modulus can be provided.

  It is not clear about the mechanism that can suppress the increase in Tan δ when improving the elastic modulus by mixing a high-elasticity polystyrene resin with a polyamide-based thermoplastic elastomer. Is presumed to be due to the sea-island structure.

[Resin material]
The resin material constituting the tire skeleton includes at least a polyamide-based thermoplastic elastomer and a polystyrene-based resin. In addition, in the case where the same kind is used in the resin material, it refers to forms such as polyamides and styrenes.

(Polyamide thermoplastic elastomer)
The “polyamide-based thermoplastic elastomer” is a thermoplastic resin comprising a copolymer having a crystalline polymer having a high melting point and a non-crystalline polymer having a low glass transition temperature. It means a material having an 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 constitutes a hard segment having a high melting point and at least a polyamide being crystalline, and a soft segment having a low glass transition temperature and other polymers (for example, polyester or polyether). Materials. The polyamide thermoplastic elastomer may use a chain extender such as dicarboxylic acid in addition to the hard segment and the soft segment. Examples of the polyamide that forms the hard segment include polyamides produced from monomers represented by the following general formula (1) or general formula (2).

General formula (1)


[In General Formula (1), R ¹ represents a molecular chain of a hydrocarbon having 2 to 20 carbon atoms or an alkylene group having 2 to 20 carbon atoms. ]

General formula (2)


[In General Formula (2), R ² represents a molecular chain of a hydrocarbon having 3 to 20 carbon atoms or an alkylene group having 3 to 20 carbon atoms. ]

In general formula (1), R ¹ is preferably a hydrocarbon chain having 3 to 18 carbon atoms or an alkylene group having 3 to 18 carbon atoms, and a hydrocarbon molecular chain having 4 to 15 carbon atoms or 4 carbon atoms. To 15 alkylene groups are more preferable, and hydrocarbon chains having 10 to 15 carbon atoms or alkylene groups having 10 to 15 carbon atoms are particularly preferable. In general formula (2), R ² is preferably a hydrocarbon molecular chain having 3 to 18 carbon atoms or an alkylene group having 3 to 18 carbon atoms, and a molecular chain or carbon having 4 to 15 carbon atoms. An alkylene group having 4 to 15 carbon atoms is more preferable, and a molecular chain of a hydrocarbon having 10 to 15 carbon atoms or an alkylene group having 10 to 15 carbon atoms is particularly preferable.
Examples of the monomer represented by the general formula (1) or the general formula (2) include ω-aminocarboxylic acid and lactam. Examples of the polyamide forming the hard segment include polycondensates of these ω-aminocarboxylic acids and lactams, and co-condensation polymers of diamines and dicarboxylic acids.

Examples of the ω-aminocarboxylic acid include 6-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 10-aminocapric acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid. And aliphatic ω-aminocarboxylic acid. Moreover, as a lactam, C5-C20 aliphatic lactams, such as lauryl lactam, (epsilon) -caprolactam, udecan lactam, (omega) -enantolactam, 2-pyrrolidone, etc. can be mentioned.
Examples of the diamine include ethylenediamine, trimethylenediamine, tetramethylenediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, nonamethylenediamine, decamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2, Examples thereof include diamine compounds such as aliphatic diamines having 2 to 20 carbon atoms such as 4-trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, 3-methylpentamethylenediamine, and metaxylenediamine. Further, the dicarboxylic acid can be represented by HOOC- (R ³ ) m-COOH (R ³ : a hydrocarbon molecular chain having 3 to 20 carbon atoms, m: 0 or 1). For example, oxalic acid, succinic acid And aliphatic dicarboxylic acids having 2 to 20 carbon atoms such as glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid and dodecanedioic acid.
As the polyamide forming the hard segment, a polyamide obtained by ring-opening polycondensation of lauryl lactam, ε-caprolactam or udecan lactam can be preferably used.

Examples of the polymer that forms the soft segment include polyesters and polyethers, such as polyethylene glycol, propylene glycol, polytetramethylene ether glycol, ABA type triblock polyether, and the like. A single compound or two or more compounds can be used. Moreover, polyether diamine etc. which are obtained by making animonia etc. react with the terminal of polyether can be used.
Here, the “ABA type triblock polyether” means a polyether represented by the following general formula (3).

General formula (3)


[In general formula (3), x and z represent the integer of 1-20. y represents an integer of 4 to 50. ]

  In the general formula (3), x and z are each preferably an integer of 1 to 18, more preferably an integer of 1 to 16, particularly preferably an integer of 1 to 14, and most preferably an integer of 1 to 12. . In the general formula (3), each of y is preferably an integer of 5 to 45, more preferably an integer of 6 to 40, particularly preferably an integer of 7 to 35, and most preferably an integer of 8 to 30. .

  Examples of the combination of the hard segment and the soft segment include the combinations of the hard segment and the soft segment mentioned above. Among these, lauryl lactam ring-opening polycondensate / polyethylene glycol combination, lauryl lactam ring-opening polycondensate / polypropylene glycol combination, lauryl lactam ring-opening polycondensate / polytetramethylene ether glycol combination, lauryl lactam The ring-opening polycondensate / ABA triblock polyether combination is preferred, and the lauryl lactam ring-opening polycondensate / ABA triblock polyether combination is particularly preferred.

  The number average molecular weight 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 (x: y) to the hard segment (x) and the soft segment (y) is preferably 50:50 to 90:10, 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 that forms the hard segment and the polymer that forms 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.) manufactured by Ube Industries, Ltd., Daicel Eponic Corporation "Vestamide" series (for example, E40-S3, E47-S1, E47-S3, E55-S1, E55-S3, EX9200, E50-R2, E40-S4, E55-S4, E62-S4) and the like can be used. .

-Physical properties of polyamide thermoplastic elastomers-
As the polyamide-based thermoplastic elastomer, one that exhibits desired tire performance can be appropriately selected.

From the viewpoint of tire performance, the elastic modulus (E _PAE ) of the polyamide-based thermoplastic elastomer is preferably 5 MPa to 700 MPa, more preferably 10 MPa to 500 MPa, and particularly preferably 10 MPa to 400 MPa.
Similarly, Tan δ of the polyamide-based thermoplastic elastomer is preferably 0.01 to 0.12, more preferably 0.01 to 0.10, and particularly preferably 0.01 to 0.08. Here, the “loss factor (Tanδ)” is calculated from the ratio (G ″ / G ′) of the storage shear modulus (G ′) and the loss shear modulus (G ″) at 30 ° C., 20 Hz, and a shear strain of 1%. It is a value indicating how much energy the material absorbs (changes to heat) when the material deforms. Tan δ absorbs energy as the value increases, so that the rolling resistance of the tire increases, and as a result, the fuel consumption performance of the tire decreases. The Tan δ of the thermoplastic elastomer can be measured with a dynamic viscoelasticity measuring device (Dynamic-Mechanical Analysis: DMA).

  The content of the polyamide-based thermoplastic elastomer in the resin material constituting the tire frame is preferably 45 to 95% by mass, more preferably 50 to 95% by mass from the viewpoint of the elastic modulus and solvent resistance of the tire frame. 50 to 90% by mass is particularly preferable.

The glass transition temperature (Tg) of the polyamide-based thermoplastic elastomer is preferably −70 ° C. to 100 ° C., and −50 ° C. to 50 ° C. from the viewpoints of manufacturability such as handleability during injection molding and Tan δ value. Further preferred.
The glass transition temperature can be measured by differential scanning calorimetry (DSC).

(Polystyrene resin)
The polystyrene resin is a polystyrene resin having a higher elastic modulus than the polyamide thermoplastic elastomer contained in the tire frame body.
As said polystyrene resin, what is obtained by the well-known radical polymerization method and ionic polymerization method can be used conveniently, for example, the polystyrene which has anion living polymerization is mentioned, for example. Examples of the polystyrene-based resin include a polymer containing a styrene molecular skeleton and a copolymer of styrene and acrylonitrile.
Of these, acrylonitrile / butadiene / styrene copolymers and hydrogenated products thereof; blends of acrylonitrile / styrene copolymers and polybutadiene or hydrogenated products thereof are preferred. Specific examples of the polystyrene resin include polystyrene (so-called PS resin), acrylonitrile / styrene resin (so-called AS resin), acrylonitrile / butadiene / styrene resin (so-called ABS resin (including blend system and copolymer system)), ABS. Examples thereof include a hydrogenated resin (so-called AES resin), and ABS resin, AES resin and AS resin are preferable, and ABS resin and AES resin are particularly preferable.

The “polystyrene resin” in the present invention has an elastic modulus (E _PS ) larger than the elastic modulus (E _PAE ) of the polyamide-based thermoplastic elastomer (formula (1): E _PAE <E _PS ). The elastic modulus (E _PS ) of the polystyrene-based resin is not particularly limited as long as it satisfies the formula (1), but is 700 MPa or more from the viewpoint of increasing a desired elastic modulus while maintaining a low Tan δ. It is preferably 900 MPa or more, more preferably 1000 MPa or more. Similarly, the difference in elastic modulus (E _PS -E _PAE ) between the polyamide-based thermoplastic elastomer and the polystyrene-based resin is preferably 100 MPa or more, more preferably 500 MPa or more, and particularly preferably 700 MPa or more.

  Although the glass transition temperature (Tg) of the polystyrene resin varies depending on the combination of the polyamide thermoplastic elastomer and the polystyrene resin used, from the viewpoint of manufacturability (handleability) at the time of molding the tire skeleton, It is preferable that it is 150-200 degreeC, -130-150 degreeC is still more preferable.

  Similarly, Tan δ of the polystyrene resin itself is preferably 0.01 to 1.0, more preferably 0.01 to 0.8, and particularly preferably 0.01 to 0.7. The Tan δ of the polystyrene-based resin can be measured with a dynamic viscoelasticity measuring apparatus (Dynamic-Mechanical Analysis: DMA).

  The content of the polystyrene resin in the resin material constituting the tire skeleton is preferably 5 to 55% by mass, more preferably 5 to 50% by mass, from the viewpoint of the elastic modulus and solvent resistance of the tire skeleton. ˜50 mass% is particularly preferred.

(Resin material)
In the resin material containing the polyamide-based thermoplastic elastomer and the polystyrene-based resin, the content ratio (x: y) of the polyamide-based thermoplastic elastomer (x) and the polystyrene-based resin (y) is particularly limited. However, from the viewpoint of sea-island structure and solvent resistance and productivity, 95: 5 to 10:90 is preferable, 90:10 to 30:70 is more preferable, and 90:10 to 55:45 is particularly preferable. preferable. In particular, when the sea-island structure of the resin material is configured such that the polyamide-based thermoplastic elastomer forms the sea phase and the polystyrene-based resin forms the island phase, the content of the polyamide-based thermoplastic elastomer is the content of the polystyrene-based resin. It is preferred that it be greater than the amount.

  The melting point (or softening point) of the resin material (tire frame) itself is usually 100 ° C. to 350 ° C., preferably about 100 ° C. to 250 ° C., but 120 ° C. to 250 ° C. from the viewpoint of tire productivity. A degree is preferable and 120 to 200 degreeC is still more preferable. As described above, when a thermoplastic resin material containing a thermoplastic elastomer having a melting point of 120 to 250 ° C. is used, for example, when a skeleton of a tire is formed by fusing the divided bodies (frame pieces), 120 Even in the case of a skeleton body fused in the ambient temperature range of from ℃ to 250 ℃, the adhesion strength between the tire skeleton pieces is sufficient. For this reason, the tire of this invention is excellent in durability at the time of driving | running | working, such as puncture resistance and abrasion resistance. The heating temperature is preferably 10 to 150 ° C., more preferably 10 to 100 ° C. higher than the melting point (or softening point) of the thermoplastic resin material including the thermoplastic elastomer that forms the tire frame piece.

  In the present invention, the total content of the polyamide-based thermoplastic elastomer and the polystyrene-based resin in the resin material (tire frame) is not particularly limited, but is 50% by mass or more based on the total amount of the resin material. Is preferable, and 90 mass% or more is still more preferable. When the total content of the polyamide-based thermoplastic elastomer and the polystyrene-based resin is 50% by mass or more with respect to the total amount of the resin material, the effect of combining the polyamide-based thermoplastic elastomer and the polystyrene-based resin is sufficiently exhibited. Can do. Examples of the resin material include rubber, other thermoplastic elastomers, thermoplastic resins, various fillers (for example, silica, calcium carbonate, clay), anti-aging agents, oils, plasticizers, colorants, and weather resistance. Various additives such as an agent and a reinforcing material may be contained.

  The resin material can be obtained by mixing the thermoplastic elastomer and the polystyrene resin, adding various additives as necessary, and mixing them appropriately by a known method (for example, melt mixing). . The thermoplastic resin material obtained by melt mixing can be used in the form of pellets if necessary.

  As the tensile modulus of elasticity (hereinafter referred to as “elastic modulus” in this specification unless otherwise specified) as defined in JIS K7113: 1995 of the resin material (tire frame) itself is 100. -1000 MPa is preferable, 100-800 MPa is more preferable, and 100-700 MPa is particularly preferable. When the tensile elastic modulus of the resin material is 100 to 700 MPa, the rim can be assembled efficiently while maintaining the shape of the tire frame.

  The tensile yield strength defined in JIS K7113: 1995 of the resin material (tire frame) itself 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 resin material is 5 MPa or more, the resin material can withstand deformation against a load applied to the tire during traveling.

  The tensile yield elongation defined by JIS K7113: 1995 of the resin material (tire frame) itself is preferably 10% or more, preferably 10 to 70%, and more preferably 15 to 60%. When the tensile yield elongation of the resin material is 10% or more, the elastic region is large, and the rim assembly property can be improved.

  The tensile elongation at break specified in JIS K7113: 1995 of the resin material (tire frame) itself 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 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.

  The deflection temperature under load (when loaded with 0.45 MPa) as defined in ISO 75-2 or ASTM D648 of the resin material (tire frame) itself is preferably 50 ° C. or higher, preferably 50 to 150 ° C., 50 to 130 ° C. Is more preferable. When the deflection temperature under load of the resin material is 50 ° C. or higher, deformation of the tire skeleton can be suppressed even when vulcanization is performed in the manufacture of the tire.

(Compatibilizer)
The resin material may include a compatibilizer for the polyamide-based thermoplastic elastomer and the polystyrene-based resin. When a compatibilizer is used in combination with the polyamide-based thermoplastic elastomer and the polystyrene-based resin, the modulus of elasticity can be improved while maintaining Tan δ as compared with the case where the polyamide-based thermoplastic elastomer is used alone, elongation at break, etc. It is possible to improve the destructive properties. Although it is not clear about the mechanism that exerts such an effect, in the sea-island structure formed by the polyamide-based thermoplastic elastomer and the polystyrene-based resin, the compatibilizer exists at the interface between the sea phase and the island phase, and the sea phase and the island phase. It is presumed that this is because the bonding strength is strengthened and the interfacial tension between the polyamide-based thermoplastic elastomer and the styrene-based resin is lowered to refine the island phase.

Here, the “compatibility” means a solvent having a substituent that interacts with one of the polyamide-based thermoplastic elastomer and the polystyrene-based resin in the resin material and can be mixed with the other. To do. The compatibilizer may have a substituent that interacts with each of the polyamide-based thermoplastic elastomer and the polystyrene-based resin.

Examples of the interaction include general ones such as ion-ion interaction, hydrogen bond, dipole interaction, van der Waals force, and the like. Examples of the substituent that interacts with the polyamide-based thermoplastic elastomer include an epoxy group, a carboxyl group, an amino group, and a hydroxyl group. In addition, examples of the substituent that interacts with the polystyrene resin include a benzene group and a methylbenzene group. The compatibilizer is a resin / thermoplastic elastomer / rubber containing the same kind of molecular skeleton as any of the above-mentioned polyamide-based thermoplastic elastomers and polystyrene-based resins, and has a substituent that interacts with the other. Etc. can be used.
Examples of the compatibilizer include an epoxy group-modified acrylic resin, an epoxy group-modified methacrylic acid resin, an epoxy group-modified acrylic ester resin, an epoxy group-modified methacrylate resin, an epoxy group-modified acrylic thermoplastic elastomer, and an epoxy group Epoxy group-modified (meth) acrylic resins such as modified acrylic ester thermoplastic elastomers, epoxy group modified methacrylic acid thermoplastic elastomers, epoxy group modified methacrylic ester thermoplastic elastomers; acid modified polystyrene thermoplastic elastomers, amino groups Modified polystyrene thermoplastic elastomer, epoxy group modified SBR, amino group modified SBR, etc. can be used, epoxy group modified (meth) acrylic resin, acid modified polystyrene thermoplastic elastomer, amino group modified poly Styrene-based thermoplastic elastomers are preferred, epoxy-modified (meth) acrylic resin, acid-modified polystyrene-based thermoplastic elastomer particularly preferred.

  The content of the compatibilizer is preferably 0.1 to 50% by mass, and 0.5 to 45% by mass with respect to the resin material, from the viewpoint of making the polyamide thermoplastic elastomer into a sea structure. More preferably, 0.5-30 mass% is especially preferable.

(Polystyrene thermoplastic elastomer)
The resin material can further include a polystyrene-based thermoplastic elastomer. As the polystyrene-based thermoplastic elastomer, either an acid-modified polystyrene-based thermoplastic elastomer modified with an acid group or an unmodified polystyrene-based thermoplastic elastomer can be used. When the acid-modified or non-modified polystyrene-based thermoplastic elastomer is used in combination with the polyamide-based thermoplastic elastomer and polystyrene-based resin, the modulus of elasticity is improved while maintaining Tanδ as compared with the case where the polyamide-based thermoplastic elastomer is used alone. In addition, it is possible to improve fracture characteristics such as elongation at break. The mechanism that produces these effects is not clear, but it is presumed that some polystyrene thermoplastic elastomer acts on the sea-island structure formed by the polyamide thermoplastic elastomer and the polystyrene resin. That is, the acid-modified polystyrene-based thermoplastic elastomer has the same effect as the above-mentioned compatibilizer, and strengthens the binding force between the sea phase and the island phase by being present at the interface between the sea phase and the island phase. Presumed to be. On the other hand, when an unmodified polystyrene-based thermoplastic elastomer is used and the island phase is formed of a polystyrene-based resin, the unmodified polystyrene-based thermoplastic elastomer is easily mixed with the island phase. In this case, since the island phase is composed of a polystyrene-based thermoplastic elastomer, the elastic modulus is high, but by mixing unmodified polystyrene with the island phase, in some cases, configuring the pond phase within the island phase, It is presumed that the elastic modulus can be reduced and the fracture characteristics such as elongation at break and tensile characteristics can be improved.

As the polystyrene-based thermoplastic elastomer, at least polystyrene constitutes a hard segment, and other polymers (for example, polybutadiene, polyisoprene, polyethylene, hydrogenated polybutadiene, hydrogenated polyisoprene, etc.) are soft segments having a low glass transition temperature. The material which comprises is mentioned. Further, as the polystyrene-based thermoplastic elastomer, synthetic rubber such as vulcanized SBR resin may be used.
As the polystyrene forming the hard segment, for example, those obtained by a known radical polymerization method or ionic polymerization method can be suitably used, and examples thereof include polystyrene having anion living polymerization. Examples of the polymer forming the soft segment include polybutadiene, polyisoprene, poly (2,3-dimethyl-butadiene), and the like. The acid-modified polystyrene-based thermoplastic elastomer can be obtained by acid-modifying an unmodified polystyrene-based thermoplastic elastomer as described later.

  As a combination of the above-mentioned hard segment and a soft segment, each combination of a hard segment and a soft segment mentioned above can be mentioned. Among these, a combination of polystyrene / polybutadiene and a combination of polystyrene / polyisoprene are preferable. Moreover, in order to suppress the unintended cross-linking reaction of the thermoplastic elastomer, the soft segment is preferably hydrogenated.

The number average molecular weight of the polymer (polystyrene) constituting the hard segment is preferably 5,000 to 500,000, and preferably 10,000 to 200,000.
Moreover, as a number average molecular weight of the polymer which comprises the said soft segment, 5000-1 million are preferable, 10000-800000 are more preferable, and 30000-500000 are especially preferable. Furthermore, the volume ratio (x: y) to the hard segment (x) and the soft segment (y) is preferably 5:95 to 80:20, more preferably 10:90 to 70:30, from the viewpoint of moldability. preferable.

The polystyrene-based thermoplastic elastomer can be synthesized by copolymerizing the polymer that forms the hard segment and the polymer that forms the soft segment by a known method.
Examples of the polystyrene-based thermoplastic elastomer include styrene-butadiene copolymer [SBS (polystyrene-poly (butylene) block-polystyrene), SEBS (polystyrene-poly (ethylene / butylene) block-polystyrene)], styrene-isoprene copolymer. Polymer [polystyrene-polyisoprene block-polystyrene), styrene-propylene copolymer [SEP (polystyrene- (ethylene / propylene) block), SEPS (polystyrene-poly (ethylene / propylene) block-polystyrene), SEEPS (polystyrene) -Poly (ethylene-ethylene / propylene) block-polystyrene), SEB (polystyrene (ethylene / butylene) block) and the like are mentioned, and SEBS is particularly preferable.

  As the unmodified polystyrene-based thermoplastic elastomer, for example, “Tough Tech” series manufactured by Asahi Kasei Co., Ltd. (for example, H1031, H1041, H1043, H1051, H1052, H1053, H1062, H1082, H1141, H1221, H1272), SEBS ("Hibler" 5127, 5125, etc.) manufactured by Kuraray Co., Ltd., SEPS ("Septon" 2002, 2063, S2004, S2006, etc.) and the like can be used.

  The content of the unmodified polystyrene-based thermoplastic elastomer is preferably smaller than the content of the polyamide-based thermoplastic elastomer from the viewpoint of making the polyamide-based thermoplastic elastomer into the sea. Specifically, the content of the unmodified polystyrene-based thermoplastic elastomer is preferably 5 to 50% by mass, more preferably 5 to 45% by mass, and particularly preferably 5 to 30% by mass with respect to the resin material. .

-Acid-modified polystyrene-based thermoplastic elastomer-
“Acid-modified polystyrene-based thermoplastic elastomer” is an unmodified polystyrene-based thermoplastic elastomer that is acid-modified by bonding an unsaturated compound having an acidic group such as a carboxylic acid group, a sulfuric acid group, or a phosphoric acid group. It means a plastic elastomer. The acid-modified polystyrene-based thermoplastic elastomer can be obtained, for example, by bonding (for example, graft polymerization) an unsaturated bond site of unsaturated carboxylic acid or unsaturated carboxylic acid anhydride to the polystyrene-based thermoplastic elastomer.

  As the (unsaturated) compound having an acidic group, a compound having a carboxylic acid group which is a weak acid group is preferable from the viewpoint of suppressing deterioration of the polyamide-based thermoplastic elastomer. For example, acrylic acid, methacrylic acid, itaconic acid, croton Examples include acids, isocrotonic acid, maleic acid and the like.

  Examples of the acid-modified polystyrene-based thermoplastic elastomer include Asahi Kasei Corporation, Tuftec, for example, M1943, M1911, M1913, Kraton, FG19181G, and the like.

As described above, the resin material has a sea-island structure including a sea phase that is a matrix phase composed of a polyamide-based thermoplastic elastomer and an island phase that is a dispersed phase composed of the polystyrene-based resin. Embodiments are preferred.
On the other hand, in the sea-island structure, the island phase tends to be smaller as the acid value of the acid-modified polystyrene-based thermoplastic elastomer is higher, and the island phase tends to be larger as the acid value is lower. Thus, when the island phase is finely dispersed in the resin material, the impact resistance is particularly improved. Moreover, the higher the oxidation of the acid-modified polystyrene-based thermoplastic elastomer, the greater the interaction with the polyamide-based thermoplastic elastomer, and the melt viscosity of the resin material increases. By using a combination of an acid-modified polystyrene-based thermoplastic elastomer and a polystyrene-based thermoplastic elastomer, the melt viscosity of the resin material does not increase excessively and the resin material is excellent in injection moldability by adjusting the oxidation. Accordingly, when the tire skeleton is produced using the resin material, it is not necessary to heat the resin material to a high temperature, so that the occurrence of overheating damage to the resin material can be suppressed.
In addition, it can confirm from the photograph observation using SEM (scanning electron microscope) that the island phase of the acid-modified elastomer is finely dispersed in the thermoplastic resin.

The acid value of the acid-modified polystyrene thermoplastic _{elastomers, 0mg (CH 3 ONa) /} g , greater 20mg _(CH 3 ONa) / g is preferably less _{that, 0mg (CH 3 ONa) /} g and beyond 17 mg (CH ₃ ONa) / g or less, more preferably 0 mg (CH ₃ ONa) / g and particularly preferably 15 mg (CH ₃ ONa) / g or less.

  The content of the acid-modified polystyrene-based thermoplastic elastomer is preferably less than the content of the polyamide-based thermoplastic elastomer, from the viewpoint of making the polyamide-based thermoplastic elastomer into the sea. Specifically, the content of the acid-modified polystyrene-based thermoplastic elastomer is preferably 5 to 50% by mass, more preferably 5 to 40% by mass, and particularly preferably 5 to 30% by mass with respect to the resin material. .

[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 (for example, UBESTA, “XPA9048X1”: elastic modulus 183 MPa, manufactured by Ube Industries, Ltd.) and an ABS resin (for example, Technopolymer Co., Ltd.) as a styrene-based resin. “Techno ABS170”: elastic modulus of 1373 MPa), and further, unmodified SEBS (for example, “Tuftec H1041” manufactured by Asahi Kasei Chemicals) is used as the styrene elastomer.

  In the present embodiment, the tire case 17 is formed of a single thermoplastic resin material (polyamide thermoplastic elastomer + ABS resin + unmodified SEBS). However, the present invention is not limited to this configuration, and a conventional general rubber is used. Similarly to the manufactured pneumatic tire, a thermoplastic resin material having different characteristics for each part of the tire case 17 (side portion 14, crown portion 16, bead portion 12, etc.) may be used. 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 obtained by bonding a pair of tire case halves (tire frame pieces) 17A formed of a resin material containing a polyamide-based thermoplastic elastomer, an ABS resin, and unmodified SEBS. . 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 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 the resin material can be formed by, for example, vacuum forming, pressure forming, 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 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, rubber An annular seal layer 24 made of 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 better sealing properties than the resin material constituting the tire case 17, a softer material than the resin material constituting the tire case 17 can be used. 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 by the resin material forming the tire case 17, the rubber seal layer 24 may be omitted, and other thermoplastic resins having a sealing property superior to the resin material. (Thermoplastic elastomer) may be used. Examples of such other thermoplastic resins include resins such as polyurethane resins, polyolefin resins, polystyrene resins, and polyester resins, 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 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. On the outer circumferential side of the reinforcing cord layer 28 in the tire radial direction, a tread 30 made of a material having higher wear resistance than the resin material constituting the tire case 17, for example, rubber, is disposed.

  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 the crown portion of the tire case of the tire of 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 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 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 (or softening 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. Or softened or melted beforehand by hot air, infrared irradiation, etc., and pressed by a joining mold. The tire case halves may be joined.

(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. In the present embodiment, the surface of the first roller 60 or the second roller 64 is made of fluororesin (in this embodiment, Teflon (registered trademark)) in order to suppress adhesion of a molten or softened resin material. It is coated. 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 reinforcing cord 26 passes through an internal space in which hot air is supplied, and a discharge port 76 for discharging the heated reinforcing 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 resin material at the contact portion is melted or softened, and at least a part of the heated reinforcing cord 26 is embedded in the outer peripheral surface of the crown portion 16. Is done. At this time, since the heated reinforcing cord 26 is embedded in the molten or softened resin material, there is no gap between the resin material and the reinforcing cord 26, that is, a tight 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 (or softening point) of the resin material of the tire case 17, melting or softening of the 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 a resin material including a polyamide-based thermoplastic elastomer, an ABS resin, and unmodified SEBS, the loss factor (Tanδ) of the tire frame body is maintained low. As it is, the elastic modulus is improved as compared with the case where the polyamide-based thermoplastic elastomer is used alone. For this reason, the rolling resistance of the tire 10 is reduced while the elastic modulus is in a range of 100 to 700 MPa. The tire 10 is light in weight because it has a simple structure as compared with a conventional rubber tire. For this reason, the tire 10 of this embodiment has high friction resistance and durability.

  Furthermore, since the tire 10 of the present embodiment contains unmodified SEBS, the fracture characteristics are improved as compared with the case where only the polyamide-based thermoplastic elastomer and the ABS resin are used.

  Further, in the tire 10 of the present embodiment, a reinforcing cord 26 having a rigidity higher than that of the 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 a 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 embedded in the outer peripheral surface of the crown portion 16 of the tire case 17 made of a resin material in a cross-sectional view along the axial direction of the tire case 17 (cross section shown in FIG. 1). In addition, since it is in close contact with the 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 reinforcement cord 26, tire case 17, and tread 30, and durability of tire 10 improves.

When the reinforcing cord layer 28 is configured to include a resin material in this way, the difference in hardness between the tire case 17 and the reinforcing cord layer 28 is reduced as compared with 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 26 is a steel cord, the reinforcing cord 26 can be easily separated and collected from the resin material by heating at the time of disposal of the tire, which is advantageous in terms of recyclability of the tire 10. Further, since the resin material has a lower loss coefficient (Tan δ) than vulcanized rubber, if the reinforcing cord layer 28 contains a large amount of the resin material, the rolling property of the tire can be improved. Furthermore, the resin material has an advantage that the in-plane shear rigidity is larger than that of the vulcanized rubber, and the handling property and wear resistance during running of the tire are excellent.

  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.

In addition, since the tread 30 that comes into contact with the road surface is made of a rubber material that is more resistant to wear than the resin material constituting the tire case 17, 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 than the resin material constituting the tire case 17 is provided at a portion of the bead portion 12 that contacts the rim 20, the tire 10 and the rim 20 The sealing performance between the two is improved. For this reason, compared with the case where it seals only with the rim | limb 20 and the resin material which comprises the tire case 17, the air leak in a tire is suppressed further. 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 surface of the tire case 17 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 It is also possible to use a hot air generating device without heating 26 and heat the outer peripheral surface of the crown portion 16 in which the reinforcing cord 26 is embedded, and then embed the reinforcing cord 26 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 may be directly heated by radiant heat (for example, infrared rays). 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. However, the present invention has this configuration. It is not limited, It is good also as a structure which forcibly cools and solidifies the melt | dissolved or softened part of the thermoplastic resin material by spraying cold air directly on the part where the thermoplastic resin material was melted or softened.

  In the first embodiment, the reinforcing cord 26 is heated. However, for example, the outer periphery of the reinforcing cord 26 may be covered with the same resin material as the tire case 17. In this case, the covering reinforcing cord is used. When the wire is wound around the crown portion 16 of the tire case 17, the resin material covered with the reinforcing cord 26 is also heated, so that the air can be effectively suppressed when being embedded in the crown portion 16.

  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 can be considered.

  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 is limited to this configuration. It may be a complete tube shape.

  As shown in FIG. 4, the complete tube-shaped tire may have a configuration in which three annular tire frames are 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 body) 88 made of a resin material similar to that of the first embodiment, and a belt (reinforcing cord) 89. And a rim 90. 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.

[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 a cross-sectional shape substantially similar to 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 tire in a bead portion in a state where a rim is fitted to the tire of the second embodiment. It is an enlarged view of the cross section along the 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 made of a polyamide-based thermoplastic elastomer (for example, UBESTA, “XPA9048X1”: elastic modulus 183 MPa, manufactured by Ube Industries, Ltd.) and ABS resin (like the first embodiment described above). For example, “Techno ABS130” manufactured by Techno Polymer Co., Ltd., and an elastic modulus of 1853 MPa) are used using an acid-modified polystyrene-based thermoplastic elastomer (for example, “Tuftec M1913” manufactured by Asahi Kasei Chemicals Corporation) as a compatibilizer.

  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 separate from the resin material forming the tire case 17 on the cord member 26A having higher rigidity than the resin material forming the tire case 17. . In addition, the covering cord member 26B is joined (for example, welded or bonded with an adhesive) to the covering cord member 26B and the crown portion 16 at the contact portion with the crown portion 16.

  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, a material similar to the resin material forming the tire frame is used as the coating resin material 27.

  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.
(Skeleton formation process)
First, in the same manner as in the first embodiment described above, the tire case half 17A is formed, and this is heated and pressed by a joining mold to form the tire case 17.

(Reinforcement cord member winding process)
The tire manufacturing apparatus according to the present embodiment is the same as that of 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 with the coating resin material 27. In this embodiment, the one in which the covering cord member 26B having a substantially trapezoidal cross-sectional shape covered with (the same resin material as the tire case) is used 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 a 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 set to the melting point of the coating resin material 27 (or Softening point) or more). 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. The melted 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)
Next, a blasting device (not shown) emits a projection material at a high speed toward 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)
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 triazine thiol adhesive, chlorinated rubber adhesive, phenolic resin adhesive, isocyanate adhesive, halogenated rubber adhesive, rubber adhesive, etc. It is preferable to react at a temperature (90 ° C. to 140 ° C.) at which the rubber 29 can be vulcanized.

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

(Vulcanization process)
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.

  And if the sealing layer 24 which consists of a soft material softer than a resin material is adhere | attached on the bead part 12 of the tire case 17 using an adhesive agent etc., the tire 200 will be completed.

(Function)
In the tire 200 of the present embodiment, since the tire case 17 is formed of a resin material containing a polyamide-based thermoplastic elastomer, an ABS resin, and acid-modified SEBS, the loss factor (Tanδ) of the tire frame body is kept low. As it is, the elastic modulus is improved as compared with the case where the polyamide-based thermoplastic elastomer is used alone. For this reason, the rolling resistance of the tire 200 is reduced while the elastic modulus is in the range of 100 to 700 MPa. The tire 200 is light in weight because it has a simple structure as compared with a conventional rubber tire. For this reason, the tire 200 of this embodiment has high friction resistance and durability.

  Furthermore, since the tire 200 of the present embodiment contains acid-modified SEBS, the fracture characteristics are improved as compared with the case where only the polyamide-based thermoplastic elastomer and the ABS resin are used.

  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 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, 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 something 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.

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 when the cord member 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.
Furthermore, when the cord member 26A is a steel cord, the cord member 26A can be easily separated and collected from the coated cord member 26B by heating at the time of disposal of the tire, which is advantageous in terms of recyclability of the tire 200. Further, since the resin material has a lower loss coefficient (Tan δ) than vulcanized rubber, if the reinforcing cord layer 28 contains a large amount of the resin material, the rolling property of the tire can be improved. Furthermore, the resin material has an advantage that the in-plane shear rigidity is larger than that of the vulcanized rubber, and the handling property and wear resistance during running of the tire are excellent.

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 case 17 (the tire case half 17A) is joined to form the tire case 17. However, the present invention is not limited to this configuration, and the tire case is formed using a mold or the like. 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 is limited to this configuration. Instead, the tire 200 may have, 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 thereto, 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 up.

In the second embodiment, the covering resin material 27 forming the covering cord member 26B is made of a thermoplastic material, and the covering resin material 27 is heated to be melted or softened to be coated on the outer peripheral surface of the crown portion 16. Although the member 26B is welded, the present invention is not limited to this structure, 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 covering resin material 27. It is good also as a structure.
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 adhered to the outer peripheral surface of the crown portion 16 by 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 adhered to the outer peripheral surface of the crown portion 16 by 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 and melted or softened 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 further roughening treatment may be applied with corona treatment, plasma treatment or the like to activate the surface of the outer peripheral surface 17S and increase the hydrophilicity, and then apply the adhesive.

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.

Moreover, the tire of this invention can be comprised as follows as shown by 1st Embodiment.
(1-1) In the tire according to the present invention, at least a part of the reinforcing cord member is embedded in the outer peripheral portion of the tire frame formed of a thermoplastic resin material in a cross-sectional view along the axial direction of the tire frame. It can be constituted as follows.
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 of the present invention has a tire skeleton piece forming step of forming a tire skeleton piece constituting a part of an annular tire skeleton body with at least the thermoplastic resin material, and a joining surface of the tire skeleton piece. A tire skeleton piece joining step of forming two or more tire skeleton pieces to which heat is applied and paired to form the tire skeleton body, and a reinforcing cord member is wound in a circumferential direction on an outer peripheral portion of the tire skeleton body And a reinforcing cord member winding step for forming a reinforcing cord layer.

(1-7) In the manufacturing method, in the tire frame piece bonding step, the bonding surface of the tire frame piece is equal to or higher than the melting point (or softening point) of the resin material constituting the tire frame piece (for example, the melting point (or (Softening point) + 10 ° C. to + 150 ° C.).
As described above, when the joining surfaces of the divided bodies are heated to a temperature equal to or higher than the melting point (or softening point) of the resin material constituting the tire frame piece, the tire frame pieces can be sufficiently fused to each other. The productivity of the tire can be increased while improving the durability.

(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 skeleton body, and the reinforcing cord member was wound around the outer peripheral portion of the tire skeleton 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 be configured to be embedded in the outer periphery.
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 air to enter the periphery of the reinforcement cord at the time of manufacture. 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.
In this way, in the reinforcing cord winding process, if 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 reinforcing 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 reinforcing 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 an outer peripheral portion of the tire frame body is cooled. Can be configured to.
Thus, after the reinforcement 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 the outer peripheral surface is finely roughened. Unevenness 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 into 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, the roughening formed on the outer peripheral surface of the tire frame body by the roughening treatment. 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 formed using the resin material, and an annular tire skeleton body in which the outer peripheral surface is roughened by colliding a particulate projection material on the outer peripheral surface, and the roughening treatment And a tire constituting rubber member laminated on the 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.

  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.

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. Under the present circumstances, the material of the following Tables 1-6 was used about the material which forms a tire case. Moreover, about each Example and the comparative example, the physical-property evaluation of the material and evaluation of the tire performance were performed according to the following.

[Preparation of pellets]
About the resin material used for the tire case in each Example and comparative example, each material was mixed by the composition (mass basis) shown in Tables 1-6. Subsequently, the resin material was kneaded (mixing temperature: 180 to 200 ° C.) by a Toyo Seiki Seisakusho “LABOPLASTOMILL 50MR” twin screw extruder to obtain pellets. In some comparative examples, pellets of polyamide thermoplastic elastomer were prepared without using a mixed system.

<Evaluation of tensile strength, elongation at break, tensile modulus, loss factor (Tanδ)>
Using the produced pellets, injection molding is performed using SE30D manufactured by Sumitomo Heavy Industries, Ltd., a molding temperature of 215 ° C. to 225 ° C., a mold temperature of 50 ° C., and a sample of 12.7 mm × 127 mm, thickness 1.6 mm Obtained.
Each sample was punched out to produce a dumbbell-shaped sample piece (No. 5 type sample piece) defined in JISK6251: 1993.

Next, using a Shimadzu Autograph AGS-J (5KN) manufactured by Shimadzu Corporation, the tensile speed was set to 200 mm / min, and the tensile strength, breaking elongation, and tensile modulus of each dumbbell-shaped sample piece at 23 ° C. The loss factor (Tan δ) was measured. Tensile strength and elongation at break were used as indices for evaluating the fracture characteristics of the tire.
The loss factor (Tanδ) was measured using ARES III manufactured by Ometrics under the conditions of 30 ° C., 20 Hz, and shear strain of 1%. The results are shown in Table 1.
FIG. 7 shows the relationship between the elastic modulus and Tan δ for each example and comparative example. FIG. 7 is a graph showing the relationship between the elastic modulus and Tan δ for each example and comparative example.

The explanation of the abbreviations in the above tables is shown below.
* Polyamide elastomer UBESTA “XPA9040X1” manufactured by Ube Industries, Ltd. (elastic modulus 91 MPa)
・ UBESTA “XPA9048X1” manufactured by Ube Industries, Ltd. (elastic modulus 183 MPa)
・ UBESTA “XPA9055X1” manufactured by Ube Industries, Ltd. (elastic modulus: 303 MPa)
・ UBESTA “XPA9063X1” manufactured by Ube Industries, Ltd. (elastic modulus 626 MPa)
* Polystyrene resin, Techno ABS “ABS130” manufactured by Technopolymer Co., Ltd. (ABS resin: elastic modulus: 1853 MPa)
・ Techno ABS “ABS170” manufactured by Technopolymer Co., Ltd. (ABS resin: elastic modulus 1373 MPa)
・ Techno AES “W245” manufactured by Techno Polymer Co., Ltd. (AES resin: elastic modulus 1665 MPa)
-EXELOY “TK10” manufactured by Techno Polymer Co., Ltd. (ABS / PBT / PC resin: elastic modulus> 1000 MPa)
PSJ-polystyrene “PS680” manufactured by PS Japan Co., Ltd. (PS resin: elastic modulus> 2000 MPa)
-Stylac AS "T8707" manufactured by Asahi Kasei Chemicals Corporation (AS resin: elastic modulus> 2000 MPa)
-Stylac AS "769" manufactured by Asahi Kasei Chemicals Corporation (AS resin: elastic modulus> 2000 MPa)
* Styrene elastomer (SEBS)
-Tuftec "M1913" manufactured by Asahi Kasei Chemicals Corporation (acid-modified SEBS (compatibility): acid value 10 mg (CH ₃ ONa) / g)
・ Tuftec "H1041" manufactured by Asahi Kasei Chemicals Corporation (unmodified SEBS)
* Solvent / reseda “GP-301” manufactured by Toagosei Co., Ltd. (epoxy group-modified acrylic resin)

As can be seen from the results of Comparative Examples 1 to 4 in Table 1, when the polyamide elastomer is used alone, it can be seen that the loss factor (Tan δ) increases with the improvement of the tensile modulus. Particularly, in Comparative Examples 3 and 4 in which the tensile elastic modulus was 300 MPa or more, Tan δ was a very high value of 0.121 or more.
On the other hand, as shown in Tables 2 to 6, in each example, the tensile elastic modulus is approximately in the range of 200 MPa to 500 MPa, but at most 0.093, and the increase in Tan δ can be suppressed while increasing the elastic modulus. I understand that.

  As can be seen from the results of Examples 2, 7, 10, 12, 15, 17, and 20, in the examples in which acid-modified polystyrene elastomer was added in addition to polyamide elastomer and styrene resin, the polyamide elastomer was used alone. It can be seen that the modulus of elasticity is improved while maintaining Tan δ as low as compared to Comparative Example 2. Furthermore, in these examples, it can be seen that the values of elongation at break are higher than those of Examples 1, 5, 9, 11, 14, 16 and 19 which do not contain an acid-modified polystyrene elastomer.

  As can be seen from the results of Examples 3, 8, 13, 18 and 21, in Examples where unmodified polystyrene elastomer was added in addition to polyamide elastomer and styrene resin, Comparative Example 2 using polyamide elastomer alone was used. In comparison, it can be seen that the elastic modulus is improved while Tan δ is kept low. Furthermore, it can be seen that also in these examples, the values of elongation at break are higher than those of Examples 1, 5, 9, 11, 14, 16 and 19 which do not contain an unmodified polystyrene elastomer.

  As can be seen from the results of Examples 21 to 25, in the examples in which the compatibilizer was added in addition to the polyamide elastomer and the styrenic resin, the elastic modulus was higher and the increase in Tan δ was remarkably higher than in the examples not containing the compatibilizer. It turns out that it is suppressed.

  Further, as can be seen from FIG. 7, it can be seen that in each example, Tan δ is kept low (an increase in Tan δ is low) even when the elastic modulus is increased as compared with each comparative example.

  Furthermore, the tires of the examples had low rolling resistance and excellent heat resistance.

10,200 tire 12 bead part 16 crown part (outer peripheral part)
18 Beadcore
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 (9)

A tire formed of at least a resin material and having an annular tire frame,
The resin material includes a polyamide-based thermoplastic elastomer having a hard segment and a soft segment in a molecule, and a polystyrene-based resin,
The tensile elastic modulus (E _PAE ) of the polyamide-based thermoplastic elastomer and the tensile elastic modulus (E _PS ) of the polystyrene resin satisfy the following formula (1),
There is a reinforcing cord member that is wound in the circumferential direction around the outer periphery of the tire frame to form a reinforcing cord layer, and only the layer that has the reinforcing cord member wound in the circumferential direction is provided as the reinforcing cord layer. And
The tire in which the total content of the polyamide-based thermoplastic elastomer and the polystyrene-based resin in the resin material is 50% by mass or more with respect to the total amount of the resin material.
Formula (1): E _PAE <E _PS   The tire according to claim 1, wherein the resin material further includes a compatibilizer for the polyamide-based thermoplastic elastomer and the polystyrene-based resin.   The tire according to claim 2, wherein the compatibilizer is an acid-modified polystyrene-based thermoplastic elastomer or an epoxy group-modified (meth) acrylic resin.   The tire according to any one of claims 1 to 3, wherein the polystyrene-based resin is a polymer containing a styrene molecular skeleton or a copolymer of styrene and acrylonitrile.   The polystyrene resin is an acrylonitrile / butadiene / styrene copolymer or a hydrogenated product thereof; or a blend of acrylonitrile / styrene copolymer and polybutadiene or a hydrogenated product thereof. The tire according to claim 1.   The tire according to any one of claims 1 to 5, wherein the resin material further includes a styrene-based thermoplastic elastomer.   The tire according to claim 6, wherein the styrenic thermoplastic elastomer is polystyrene-poly (ethylene / butylene) block-polystyrene).   In the reinforcing cord layer, at least a part of the reinforcing cord member is embedded in an outer peripheral portion of the tire frame body, or the reinforcing cord member is covered with a resin material that is the same as or different from the resin material forming the tire frame body. The tire according to any one of claims 1 to 7.   The tire according to any one of claims 1 to 8, wherein the reinforcing cord member is coated with a coating resin material that is separate from the resin material forming the tire skeleton on the cord member.