JP2012106444A - Tire and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a tire using a thermoplastic resin material to increase elastic modulus and reduce rolling resistance, and to provide the tire produced by the method.SOLUTION: The method for producing the tire comprises: a kneading step of kneading a raw material thermoplastic resin material including thermoplastic elastomer having a hard segment and a soft segment in one molecule thereof, for 10-30 minutes with 100-1,000 J/cmshear energy; and a tire skeletal body formation step of forming a tire skeletal body from the kneaded thermoplastic resin material obtained in the kneading step.

Description

  The present invention relates to a tire and a method for manufacturing a tire.

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

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

  In Patent Document 2, a reinforcing layer in which a reinforcing cord is continuously spirally wound in the tire circumferential direction is provided on the outer surface in the tire radial direction of the tread bottom portion of a tire body (tire frame body), Improves puncture resistance.

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

  In light of the above circumstances, the present invention provides a method for manufacturing a tire that is formed using a thermoplastic resin material, has a high elastic modulus, and has reduced rolling resistance, and a tire manufactured by the manufacturing method. For the purpose.

<1> the raw material thermoplastic resin material comprising a thermoplastic elastomer having a hard segment and soft segment in the ^molecule, at a shear energy of ^{100J / cm 3 ~1000J / cm 3} , a kneading step for 10 to 30 minutes kneading, And a tire frame body forming step of forming a tire frame body with the thermoplastic resin material obtained through the kneading step.

<2> The tire thermoplastic manufacturing method according to <1>, wherein the raw material thermoplastic resin material is kneaded using a twin-screw kneader equipped with a screw having a shear rate of 200 sec ^{−1 to} 3000 sec ⁻¹ .

<3> The tire according to <1> or <2>, wherein the raw material thermoplastic resin material is kneaded at a temperature 5 ° C. to 50 ° C. higher than a melting point of a polymer constituting the hard segment of the thermoplastic elastomer. It is a manufacturing method.

<4> The method for manufacturing a tire according to <2> or <3>, wherein the screw included in the biaxial kneader has a ratio (L / D) of a screw length L to a screw diameter D of 60 to 150. It is.

<5> The tire manufacturing method according to <3> or <4>, wherein the polymer constituting the hard segment of the thermoplastic elastomer has a melting point of 150 ° C to 300 ° C.

<6> The tire manufacturing method according to <4> or <5>, wherein the screw length L of the screw is 1200 mm to 6000 mm.

<7> A tire formed of a thermoplastic resin material and having a tire skeleton,
Said thermoplastic resin material, the raw material thermoplastic resin material comprising a thermoplastic elastomer having a hard segment and soft segment in the ^molecule, at a shear energy of ^{100J / cm 3 ~1000J / cm 3} , to 10 to 30 minutes kneading It is a tire which is a material obtained by this.

<8> The tire according to <7>, wherein the raw material thermoplastic resin material is kneaded using a biaxial kneader equipped with a screw having a shear rate of 200 sec ^{−1 to} 3000 sec ⁻¹ .

<9> The tire according to <7> or <8>, wherein the raw material thermoplastic resin material is kneaded at a temperature 5 ° C. to 50 ° C. higher than a melting point of a polymer constituting the hard segment of the thermoplastic elastomer. It is.

<10> The screw included in the biaxial kneader is the tire according to <8> or <9>, wherein a ratio (L / D) of a screw length L to a screw diameter D is 60 to 150.

<11> The tire according to <9> or <10>, wherein the polymer constituting the hard segment of the thermoplastic elastomer has a melting point of 150 ° C to 300 ° C.

<12> The tire according to <10> or <11>, wherein the screw length L in the screw is 1200 mm to 6000 mm.

  The method for producing a tire of the present invention can produce a tire that is formed using a thermoplastic resin material, has a high elastic modulus, and has a reduced rolling resistance. It is formed using a thermoplastic resin material, has a high elastic modulus, and suppresses rolling resistance.

(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.

<Tire manufacturing method>
The method of manufacturing a tire of the present invention, the raw material thermoplastic resin material comprising a thermoplastic elastomer having a hard segment and soft segment in the ^molecule, at a shear energy of ^{100J / cm 3 ~1000J / cm 3} , 10 to 30 minutes A kneading step of kneading and a tire skeleton forming step of forming a tire skeleton by the thermoplastic resin material obtained through the kneading step.
The tire manufacturing method of the present invention may further include a step of winding a reinforcing cord member around the tire frame body, a step of covering the tire frame body with rubber, and the like.

Here, the “thermoplastic elastomer” is a compound having a hard segment and a soft segment in the molecule. Specifically, it is a high molecular compound having elasticity, and constitutes a hard segment having a high crystalline melting point. It means a thermoplastic resin material made of a copolymer having a polymer and a polymer constituting a soft segment having an amorphous nature and a low glass transition temperature.
The thermoplastic resin in the present invention means a resin having thermoplasticity, and does not include vulcanized rubber such as conventional natural rubber and synthetic rubber. However, the “thermoplastic resin material” means a material containing at least a thermoplastic resin, and a material containing rubber or an inorganic compound in addition to the thermoplastic resin is also included in the “thermoplastic resin material”.

  Further, the time of “10 minutes to 30 minutes kneading”, which is the time condition for kneading the raw material thermoplastic resin material, is also simply referred to as “kneading time”.

The tire manufacturing method of the present invention uses a thermoplastic resin material (raw material thermoplastic resin material) containing a thermoplastic elastomer as a raw material of the thermoplastic resin material when forming a tire skeleton with the thermoplastic resin material. The raw thermoplastic resin material is kneaded with a predetermined shear energy over the kneading time to obtain a thermoplastic resin material for forming a tire skeleton.
By manufacturing the tire in this way, it is possible to manufacture a tire that is formed using a thermoplastic resin material and has a high elastic modulus and suppressed rolling resistance. The reason for this is not clear, but is thought to be due to the following action.

The raw material thermoplastic resin material includes a thermoplastic elastomer having a hard segment and a soft segment in the molecule. The elastic modulus of the thermoplastic resin material mainly depends on the ratio of the hard segment of the thermoplastic elastomer in the thermoplastic elastomer molecule and the mode of the polymer constituting the hard segment (chemical structure, molecular weight, crystallinity, etc.). The place that contributes is considered to be large.
For example, regarding the chemical structure, when the polymer constituting the hard segment is, for example, polyethylene, the polymer is flexible and has a low elastic modulus. However, when the polymer constituting the hard segment is, for example, polypropylene. It is harder and has a higher elastic modulus than polyethylene. As for the molecular weight, as the molecular weight of the polymer constituting the hard segment increases, the elastic modulus tends to increase and become harder.
In this specification, “elastic modulus” refers to the tensile elastic modulus defined in JIS K7113: 1995.

As described above, the hard segment of the thermoplastic elastomer is crystalline and has a high melting point. In addition to the chemical structure and molecular weight described above, the elastic modulus of the hard segment can also be increased by regularly arranging the molecular chains of the polymer constituting the hard segment to further increase the crystallinity of the hard segment.
Here, by giving a predetermined shear energy to the raw material thermoplastic resin material and kneading for a certain period of time or longer, the thermoplastic elastomer molecules contained in the raw material thermoplastic resin material are likely to undergo molecular motion. The molecular chain of the polymer that constitutes can easily take a regular arrangement. That is, it becomes easy to create an environment for increasing the crystallinity of the polymer constituting the hard segment. Furthermore, by giving a mechanical action to the thermoplastic elastomer, the movement of the polymer constituting the hard segment is promoted, and the crystallinity of the polymer is easily increased.
At the same time, the loss coefficient (tan δ) of the thermoplastic resin material obtained by kneading can be reduced.
However, if kneading is continued with a predetermined shear energy applied to the raw material thermoplastic resin material, the raw material thermoplastic resin material may be damaged such as overheating damage, so the kneading time is within the above kneading time range. It is necessary to.

Here, the loss factor (tan δ) of the thermoplastic resin material is considered to correspond to the magnitude of strain generated in the thermoplastic resin material when stress is applied to the thermoplastic resin material. Therefore, a large tan δ of the thermoplastic resin material used as a material for the tire frame means that the tire is likely to be distorted when stress is applied to the tire due to friction between the tire and the road surface when the vehicle is running. . As the tire is distorted, the rolling resistance of the tire increases. That is, tan δ of the thermoplastic resin material is an index indicating the rolling resistance of a tire manufactured using the thermoplastic resin material.
It is considered that the ease of occurrence of such strain in the thermoplastic resin material is largely related to the structural state such as the molecular arrangement of the thermoplastic elastomer which is a constituent component of the thermoplastic resin material. Moreover, when a thermoplastic resin material contains a some structural component, it is thought that interaction between structural components is concerned with the ease of producing the distortion | strain of a thermoplastic resin material.

  For example, it is considered that when the molecular chains of the polymer constituting the hard segment of the thermoplastic elastomer are regularly arranged, the molecular chains interact with each other and become difficult to disperse. Therefore, the thermoplastic elastomer is less likely to be distorted with respect to stress, and as a result, distortion of the thermoplastic resin material can be suppressed. Further, when the thermoplastic resin material includes a plurality of constituent components, it is considered that the constituent components are easy to be compatible with each other, and if the thermoplastic resin material has an affinity for each other, the thermoplastic resin material is hardly distorted.

According to the method for producing a tire of the present invention, the raw material thermoplastic resin material containing a thermoplastic elastomer is kneaded under the above-described conditions, whereby the mobility of the polymer molecular chain constituting the hard segment of the thermoplastic elastomer is increased. It is thought that the arrangement with the regularity can be promoted. Moreover, even when the raw material thermoplastic resin material includes a plurality of types of constituent components, the raw material thermoplastic resin material is kneaded at the above kneading temperature so that the constituent components are mixed while being familiar with each other and have an affinity for each other. It is considered to be.
Therefore, it is considered that a thermoplastic resin material which is hardly distorted can be obtained by kneading the raw material thermoplastic resin material in the kneading step in the tire manufacturing method of the present invention.

As described above, the tire manufactured by the manufacturing method of the present invention has a high elastic modulus and suppresses rolling resistance. Since the tire has a high elastic modulus, the automobile to which the tire is applied is excellent in handling stability. Moreover, since it becomes a tire by which rolling resistance was suppressed, the motor vehicle which applied this tire can suppress a fuel consumption.
Hereinafter, the tire manufacturing method of the present invention will be described in detail.

[Kneading process]
The method of manufacturing a tire of the present invention, the kneading process, the raw material thermoplastic resin material comprising a thermoplastic elastomer having a hard segment and soft segment in the ^molecule, at a shear energy of ^{100J / cm 3 ~1000J / cm 3} , 10 It is a step of kneading for 30 minutes.
The kneading step may further include a drying step for drying the raw thermoplastic resin material before kneading, a cooling step for cooling the thermoplastic resin material obtained by kneading, and the like.

(Shear energy)
In the kneading step, the Ryonetsu plastic resin ^material, is kneaded at a shear energy of ^{100J / cm 3 ~1000J / cm 3} .
If the shear energy applied to the raw material thermoplastic resin material is less than 100 J / cm ^3, it is not sufficient to regularly arrange the molecular chains of the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material. If it is greater than 1000 J / cm ³ , the raw material thermoplastic resin material is overheated and causes thermal decomposition.
Shear energy applied to Ryonetsu thermoplastic resin material ^is preferably ^{100J / cm 3 ~700J / cm 3} , and more preferably ^{100J / cm 3 ~600J / cm 3} .

-Kneading method-
The method of giving shear energy in the above range to the raw material thermoplastic resin material is not limited. For example, by using a kneading apparatus such as a uniaxial kneader, a biaxial multiaxial kneader, or a pressure kneader, the raw material heat What is necessary is just to knead | mix a plastic resin material.
About the kneading machine which has rotary stirring members, such as a screw and a propeller, the shear energy given to a raw material thermoplastic resin material can be adjusted by adjusting the shear rate [sec <^-1> ]. The shear rate [sec ⁻¹ ] is shown as the number of rotations of the rotary stirring member per second. In the present invention, the shear rate ^is preferably 200sec ^-1 ~3000sec ^-1, more preferably 400sec ^-1 ~2500sec ^-1, particularly preferably 400sec ^-1 ~1000sec -1.
Among the above, the kneading method is preferably kneading using a multi-axis kneader because shear energy can be finely adjusted, and more preferably kneading using a bi-axial kneader because adjustment is simple. .

-Spindle kneader-
The biaxial kneader is equipped with two screws.
More specifically, an inlet port for feeding the raw material thermoplastic resin material, a cylindrical kneading unit having a screw for kneading the raw material thermoplastic resin material, and an outlet port for discharging the kneaded raw material thermoplastic resin material, Have.
The shear energy applied to the raw material thermoplastic resin material can be finely adjusted by adjusting the dimensions of the screw of the twin-screw kneader in addition to the above-described shear rate.

For example, the screw included in the biaxial kneader preferably has a ratio (L / D) of the screw length L [mm] to the screw diameter D [mm] of 60 to 150.
Here, “screw length L” in the biaxial kneader means “screw effective length” in JIS B8650: 2006, that is, the axial length of the screw groove, and the unit is [mm]. The “screw diameter D” in the twin-screw kneader means “screw diameter” in JIS B8650: 2006, that is, the nominal outer diameter of the screw, and the unit is [mm]. The “ratio of screw length L [mm] to screw diameter D [mm] (L / D)” is also simply referred to as “screw L / D”.
By making the screw L / D larger than 60, the molecular chains of the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material can be easily arranged regularly, and by making it smaller than 150, the raw material thermoplasticity It is easy to suppress overheating damage of the resin material.
The screw L / D is more preferably 70 to 150, and further preferably 90 to 150.

  From the viewpoint of the arrangement of the molecular chains and the suppression of overheating of the raw material thermoplastic resin material, the screw length L is preferably 1200 mm to 3000 mm, more preferably 1200 mm to 2000 mm, and 1300 mm to 1900 mm. Is more preferable.

  The rotational directions of the two screws may be the same direction or different directions. Further, the form of the two screws may be a meshing shape, a non-meshing shape, or an incomplete meshing shape.

  As the twin-screw kneader, for example, a LABOPLASTOMILL 50MR twin-screw extruder manufactured by Toyo Seiki Seisakusho Co., Ltd. or a twin-screw extruder manufactured by Technobel Co., Ltd. can be used.

(Kneading time)
In the kneading step, the raw material thermoplastic resin material is kneaded for 10 minutes to 30 minutes.
When the kneading time is shorter than 10 minutes, the molecular chains of the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material is insufficient to regularly arrange, and when longer than 30 minutes, The raw material thermoplastic resin material may be overheated and drooped (overheated).
The kneading time is preferably 11 minutes to 28 minutes, and more preferably 12 minutes to 25 minutes.

The kneading time of the raw material thermoplastic resin material refers to the time from the start of kneading of the raw material thermoplastic resin material to the end of kneading to end the kneading. The raw material thermoplastic resin material is composed of two screws. When kneading with the twin-screw kneader provided, the time shown below is the kneading time.
That is, when the raw material thermoplastic resin material is kneaded by the biaxial kneader, the raw material thermoplastic resin material charged in the biaxial kneader is discharged to the discharge section until it is discharged from the biaxial kneader. Time spent staying. The kneading time is from the start of charging the raw thermoplastic resin material to the twin-screw kneader T1, the discharge when the raw thermoplastic resin material charged to the twin-screw kneader is discharged from the twin-screw kneader for the first time When the time is T2, it is calculated as T2-T1.

-Kneading temperature-
In the kneading step, the raw material thermoplastic resin material may be heated and kneaded.
The shear energy applied to the raw material thermoplastic resin material can also be adjusted by heating and kneading the raw material thermoplastic resin material.
The temperature (kneading temperature) at the time of kneading the raw material thermoplastic resin material is preferably 5 ° C. to 50 ° C. higher than the melting point of the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material. . The kneading temperature can be expressed as Tm + 5 ° C. to Tm + 50 ° C., where “Tm” is the melting point of the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material.
By making the kneading temperature higher than Tm + 5 ° C., the molecular chain of the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material can be easily arranged regularly, and by making it lower than Tm + 50 ° C., the raw material thermoplasticity It is easy to suppress overheating damage of the resin material.

  Here, the kneading temperature of the raw material thermoplastic resin material means a set temperature of a container that accommodates the raw material thermoplastic resin material in the raw material thermoplastic resin material kneading apparatus. When a biaxial kneader is used as a kneading apparatus for the raw material thermoplastic resin material, the raw material thermoplastic resin material is put into the biaxial kneader until the kneaded raw material thermoplastic resin material is discharged from the biaxial kneader. The setting temperature of the charging and discharging section of the biaxial kneader, that is, the setting temperature of the kneading part of the biaxial kneader.

The kneading temperature of the raw material thermoplastic resin material is the melting point of the polymer constituting the hard segment of the thermoplastic elastomer A when the raw material thermoplastic resin material contains one kind of thermoplastic elastomer (thermoplastic elastomer A). A temperature (Tma + 5 ° C. to Tma + 50 ° C.) that is higher by 5 ° C. to 50 ° C. than the melting point Tma, based on (Tma).
When the raw material thermoplastic resin material contains two or more kinds of thermoplastic elastomers, the melting point of the polymer constituting the hard segment of each thermoplastic elastomer is 5 based on the highest melting point Tmh. A temperature higher by 50 ° C. to 50 ° C. (Tmh + 5 ° C. to Tmh + 50 ° C.) is set as the kneading temperature of the raw material thermoplastic resin material.

The kneading temperature is preferably a temperature (Tm + 5 ° C. to Tm + 50 ° C.) higher by 5 ° C. to 50 ° C. than the melting point of the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material. It is more preferable that the temperature be higher by T ° C. (Tm + 10 ° C. to Tm + 30 ° C.).
Moreover, it is preferable that it is 150 to 300 degreeC, and, as for melting | fusing point of the polymer which comprises the hard segment which the thermoplastic elastomer which the raw material thermoplastic resin material has, ie, Tm, is more preferable that it is 180 to 270 degreeC. .

“The melting point (Tm) of the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material” is the same type as the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material, and The melting point measured using a polymer having the same number average molecular weight. The “same kind as the polymer” refers to a polymer having the same skeleton (repeating unit, amide bond, ester bond, etc.) constituting the main chain of the polymer.
Therefore, for example, when the raw material thermoplastic resin material includes a polyolefin-based thermoplastic elastomer and the polymer constituting the hard segment of the polyolefin-based thermoplastic elastomer is polypropylene having a number-average molecular weight of 8,000, the number-average molecular weight is 8, The melting point of 000 polypropylene is the standard for kneading temperature.
In addition, the melting point of the polymer refers to a temperature at which an endothermic peak is obtained in a curve (DSC curve) obtained by differential scanning calorimetry (DSC). Details of the method for measuring the melting point will be described later.

(Thermoplastic resin material)
In the kneading step, a raw material thermoplastic resin material containing a thermoplastic elastomer having a hard segment and a soft segment in the molecule is kneaded to obtain a thermoplastic resin material necessary for forming a tire skeleton.
The raw material thermoplastic resin material is not particularly limited as long as it contains a thermoplastic elastomer having a hard segment and a soft segment in the molecule. From the viewpoint of adjusting the shear energy given to the raw material thermoplastic resin material, the material thermoplastic resin is used. The resin material preferably has a viscosity of 100 Pa · sec to 300 Pa · sec at a melting point + 15 ° C. and a shear rate of 100 sec−1.
When the viscosity of the raw material thermoplastic resin material is smaller than 100 Pa · sec, it is difficult to regularly arrange the molecular chains of the polymer constituting the hard segment of the thermoplastic elastomer contained in the raw material thermoplastic resin material, and the viscosity is more than 300 Pa · sec. If it is too large, a load is applied to the apparatus for kneading the raw material thermoplastic resin material, and damage to the polymer increases.

In the present invention, the viscosity of the raw material thermoplastic resin material means a viscosity based on shear deformation under the kneading conditions (kneading temperature and shear rate) of the raw material thermoplastic resin material, and is measured using a capillograph manufactured by Toyo Seiki Co., Ltd. Can do.
The viscosity of the raw material thermoplastic resin material is preferably 100 Pa · sec to 300 Pa · sec at a melting point of + 15 ° C. and a shear rate of 100 sec−1.
Next, a thermoplastic elastomer that can be included in the raw thermoplastic resin material will be described.

(Thermoplastic elastomer)
“Thermoplastic elastomer” is a compound having a hard segment and a soft segment in the molecule, and more specifically, a high molecular compound having elasticity, which is a crystalline polymer having a high melting point, It means a thermoplastic resin material comprising a copolymer having an amorphous polymer having a soft glass transition temperature and constituting a soft segment.
Examples of the thermoplastic elastomer include polyamide-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, polystyrene-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, and the like.

[Polyamide thermoplastic elastomer]
A polyamide-based thermoplastic elastomer is a high-molecular compound having elasticity, and is a co-polymer having a polymer that forms a crystalline hard segment with a high melting point and a polymer that forms an amorphous soft segment with a low glass transition temperature. It means a thermoplastic resin material made of a coalescence having an amide bond (—CONH—) in the main chain of the polymer constituting the hard segment. Examples of the polyamide-based thermoplastic elastomer include amide-based thermoplastic elastomer (TPA) defined in JIS K6418: 2007, polyamide-based thermoplastic elastomer described in JP-A-2004-346273, and the like. .

  Polyamide-based thermoplastic elastomers consist of hard segments with at least polyamide crystalline and high melting point, and soft segments with other polymers (eg polyester or polyether) amorphous and low glass transition temperature. Material. 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).

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.

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 molecular 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.

The ω-aminocarboxylic acid has 6 to 20 carbon atoms such as 6-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 10-aminocapric acid, 11-aminoundecanoic acid, 12-aminododecanoic acid. Aliphatic omega-aminocarboxylic acid etc. can be mentioned. 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 ethylene diamine, trimethylene diamine, tetramethylene diamine, hexamethylene diamine, heptamethylene diamine, octamethylene diamine, nonamethylene diamine, decamethylene diamine, undecamethylene diamine, dodecamethylene diamine, 2, 2, 4 Examples include diamine compounds such as aliphatic diamines having 2 to 20 carbon atoms such as trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, 3-methylpentamethylenediamine, and metaxylenediamine. Further, dicarboxylic ^{acids, HOOC- (R 3) m-} COOH (R 3: the molecular chain of a hydrocarbon of 3 to 20 carbon atoms, m: 0 or 1) can be represented by, 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 that forms 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).

  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), each of x and z is 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. .

  As a combination of a hard segment and a soft segment, each combination of the hard segment and the soft segment mentioned above can be mentioned. 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 a soft segment, 200-6000 are preferable from a viewpoint of toughness and low temperature flexibility. Furthermore, the mass ratio (Ha: Sa) to the hard segment (Ha) and the soft segment (Sa) is preferably 50:50 to 90:10, and more preferably 50:50 to 80:20, from the viewpoint of moldability. preferable.

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

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

[Polyolefin thermoplastic elastomer]
A polyolefin-based thermoplastic elastomer is a polymer compound having elasticity, and is a co-polymer having a polymer that forms a crystalline hard segment with a high melting point and a polymer that forms an amorphous soft segment with a low glass transition temperature. A thermoplastic resin material made of a polymer, wherein the polymer constituting the hard segment is a polyolefin such as polypropylene or polyethylene.

  The polyolefin-based thermoplastic elastomer is a material in which at least the polyolefin is crystalline and constitutes a hard segment having a high melting point, and the polyolefin and the olefin other than the polyolefin are amorphous and constitute a soft segment having a low glass transition point. Can be mentioned.

Examples of the polyolefin forming the hard segment include polypropylene, isotactic polypropylene, polyethylene, and 1-butene.
Examples of the polyolefin-based thermoplastic elastomer include ethylene-propylene copolymer, propylene-1-hexene copolymer, propylene-4-methyl-1-pentene copolymer, propylene-1-butene copolymer, and ethylene- 1-hexene copolymer, ethylene-4-methyl-pentene copolymer, ethylene-1-butene copolymer, 1-butene-1-hexene copolymer, 1-butene-4-methyl-pentene, ethylene- Methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene -Butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene -Methyl methacrylate copolymer, propylene-ethyl methacrylate copolymer, propylene-butyl methacrylate copolymer, propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer , Ethylene-vinyl acetate copolymer, propylene-vinyl acetate copolymer and the like.

  Examples of the polyolefin-based thermoplastic elastomer include ethylene-propylene copolymer, propylene-1-hexene copolymer, propylene-4-methyl-1-pentene copolymer, propylene-1-butene copolymer, ethylene -1-hexene copolymer, ethylene-4-methyl-pentene copolymer, ethylene-1-butene copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate Copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene-methyl methacrylate Copolymer, propylene-ethyl methacrylate copolymer Preferred are propylene-butyl methacrylate copolymer, propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, propylene-vinyl acetate copolymer. More preferred are ethylene-propylene copolymer, propylene-1-butene copolymer, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, and propylene-1-hexene copolymer.

  The number average molecular weight of the polyolefin-based thermoplastic elastomer is preferably 5,000 to 10,000,000. If it is less than 5,000, the mechanical properties of the resin composite material may be reduced. When it exceeds 10,000,000, there is a possibility that a problem may occur in the workability of the resin composite material. For the same reason as described above, the number average molecular weight of the polyolefin-based thermoplastic elastomer is 7,000 to 1,000,000. Particularly preferably, the polyolefin-based thermoplastic elastomer has a number average molecular weight of 10,000 to 1,000,000. Thereby, the mechanical properties and workability of the resin composite material can be further improved.

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

  As the polyolefin-based thermoplastic elastomer as described above, for example, commercially available Prime TPO (registered trademark) manufactured by Prime Polymer Co., Ltd., Tuffmer (registered trademark) manufactured by Mitsui Chemicals, Inc. can be used.

[Polystyrene thermoplastic elastomer]
A polystyrene-based thermoplastic elastomer is a high-molecular compound having elasticity, and is a thermoplastic comprising a copolymer having a polymer constituting a hard segment and a polymer constituting a soft segment having an amorphous property and a low glass transition temperature. A resin material, in which the polymer constituting the hard segment contains polystyrene.

The polystyrene-based thermoplastic elastomer is not particularly limited, but at least polystyrene constitutes a hard segment, and an amorphous polymer is a soft segment having a low glass transition temperature (for example, polyethylene, polybutadiene, polyisoprene, water). Examples thereof include copolymers constituting hydrogenated polybutadiene, hydrogenated polyisoprene, poly (2,3-dimethyl-butadiene) and the like.
Examples of the polymer constituting the soft segment include polyethylene, polybutadiene, polyisoprene, hydrogenated polybutadiene, hydrogenated polyisoprene, poly (2,3-dimethyl-butadiene), and the like.

The number average molecular weight of the polymer (polystyrene) constituting the hard segment is preferably 5,000 to 500,000, and more preferably 10,000 to 200,000.
As a number average molecular weight of the polymer which comprises the said soft segment, 5,000-1,000,000 are preferable, More preferably, it is 10,000-800,000, More preferably, it is 30,000-500,000.
Furthermore, the mass ratio (Hs: Ss) between the hard segment (Hs) and the soft segment (Ss) is preferably 5:95 to 80:20, and more preferably 10:90 to 70:30, from the viewpoints of moldability and physical properties. preferable.

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

As the above-mentioned polystyrene-based thermoplastic elastomer, for example, commercially available products such as TUFPRENE (registered trademark) and TUFTEC (registered trademark) manufactured by Asahi Kasei Co., Ltd., Septon (registered trademark) manufactured by Kuraray Co., Ltd. can be used.
The polystyrene-based thermoplastic elastomer (including the acid-modified product) is preferably hydrogenated in order to suppress unintended crosslinking reaction of the thermoplastic resin material. Examples of other thermoplastic elastomers and acid-modified elastomers of hydrogenated type (SEBS, SEPS) include Tuftec (registered trademark) manufactured by Asahi Kasei Co., Ltd. and Septon (registered trademark) manufactured by Kuraray.

[Polyester thermoplastic elastomer]
The polyester-based thermoplastic elastomer in the present invention is a polymer compound having elasticity, and includes a polymer that forms a crystalline hard segment with a high melting point and a polymer that forms an amorphous soft segment with a low glass transition temperature. A thermoplastic resin material comprising a copolymer having a polyester resin as a polymer constituting a hard segment. Examples of the polyester-based thermoplastic elastomer include ester-based thermoplastic elastomers defined in JIS K6418: 2007.

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

An aromatic polyester can be used as the crystalline polyester that forms the hard segment. The aromatic polyester can be formed, for example, from an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic diol.
Examples of the aromatic polyester that forms the hard segment include polyethylene terephthalate, polybutylene terephthalate, polystyrene terephthalate, polyethylene naphthalate, and polybutylene naphthalate. Polybutylene terephthalate is preferable.

  One suitable aromatic polyester that forms the hard segment includes terephthalic acid and / or polybutylene terephthalate derived from dimethyl terephthalate and 1,4-butanediol, and further includes isophthalic acid, phthalic acid, naphthalene. Dicarboxylic acids such as -2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4'-dicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sulfoisophthalic acid, or ester-forming derivatives thereof Ingredients and diols having a molecular weight of 300 or less [for example, aliphatic diols such as ethylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentyl glycol, decamethylene glycol, 1,4-cyclohexane dimeta , Cycloaliphatic diols such as tricyclodecane dimethylol, xylylene glycol, bis (p-hydroxy) diphenyl, bis (p-hydroxyphenyl) propane, 2,2-bis [4- (2-hydroxyethoxy) Phenyl] propane, bis [4- (2-hydroxy) phenyl] sulfone, 1,1-bis [4- (2-hydroxyethoxy) phenyl] cyclohexane, 4,4′-dihydroxy-p-terphenyl, 4,4 It may be a polyester derived from an aromatic diol such as' -dihydroxy-p-quarterphenyl], or a copolymer polyester in which two or more of these dicarboxylic acid components and diol components are used in combination. It is also possible to copolymerize a trifunctional or higher polyfunctional carboxylic acid component, polyfunctional oxyacid component, polyfunctional hydroxy component, and the like in a range of 5 mol% or less.

Examples of the polymer forming the soft segment include polymers selected from aliphatic polyesters and aliphatic polyethers.
Aliphatic polyethers include poly (ethylene oxide) glycol, poly (propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol, copolymers of ethylene oxide and propylene oxide, poly (propylene oxide) Examples thereof include ethylene oxide addition polymers of glycol and copolymers of ethylene oxide and tetrahydrofuran.
Examples of the aliphatic polyester include poly (ε-caprolactone), polyenantlactone, polycaprylolactone, polybutylene adipate, and polyethylene adipate.

  Among these aliphatic polyethers and aliphatic polyesters, poly (tetramethylene oxide) glycol, poly (propylene oxide) glycol ethylene oxide adduct, poly (ε-caprolactone) from the viewpoint of the elastic properties of the resulting copolymer Polybutylene adipate, polyethylene adipate and the like are preferable.

  The number average molecular weight of the polymer (polyester) forming the hard segment is preferably 300 to 6000 from the viewpoint of toughness and low temperature flexibility. Moreover, as a number average molecular weight of the polymer which forms a soft segment, 300-6000 are preferable from a viewpoint of toughness and low temperature flexibility. Furthermore, the mass ratio (He: Se) to the hard segment (He) and the soft segment (Se) is preferably 99: 1 to 20:80, and more preferably 98: 2 to 30:70, from the viewpoint of moldability. .

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

  As the polyester-based thermoplastic elastomer, commercially available products can also be used. For example, “Hytrel” series (for example, 3046, 5557, 6347, 4047, 4767, 7247) manufactured by Toray DuPont Co., Ltd., Toyobo Co., Ltd. “Perprene” series (for example, P30B, P40B, P40H, P55B, P70B, P150B, P250B, E450B, P150M, S1001, S2001, S5001, S6001, S9001, etc.) can be used.

[Polyurethane thermoplastic elastomer]
Polyurethane-based thermoplastic elastomers consist of hard segments in which at least polyurethane forms pseudo-crosslinks due to physical aggregation, and other polymers are amorphous and have soft segments with low glass transition temperatures. For example, it can be expressed as a copolymer containing a soft segment containing a unit structure represented by the following formula A and a hard segment containing a unit structure represented by the following formula B.

  In formula A, P represents a long-chain aliphatic polyether or a long-chain aliphatic polyester. In formula A and formula B, R represents an aliphatic hydrocarbon, an alicyclic hydrocarbon, or an aromatic hydrocarbon. In Formula B, P ′ represents a short-chain aliphatic hydrocarbon, alicyclic hydrocarbon, or aromatic hydrocarbon.

In formula A, examples of the long-chain aliphatic polyether or long-chain aliphatic polyester represented by P include a long-chain aliphatic polyether or long-chain aliphatic polyester having a molecular weight of 500 to 5,000. The P is derived from a diol compound containing a long-chain aliphatic polyether or a long-chain aliphatic polyester represented by the P. Examples of such a diol compound include polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, poly (butylene abido) diol, poly-ε-caprolactone diol, poly (hexamethylene carbonate) having a molecular weight within the above range. ) Diol, the ABA triblock polyether, and the like.
These diol compounds may be used alone or in combination of two or more.

In Formula A or Formula B, R is derived from a diisocyanate compound containing an aliphatic hydrocarbon, alicyclic hydrocarbon, or aromatic hydrocarbon represented by R.
Examples of the aliphatic diisocyanate compound containing an aliphatic hydrocarbon represented by R include 1,2-ethylene diisocyanate, 1,3-propylene diisocyanate, 1,4-butane diisocyanate, and 1,6-hexamethylene diisocyanate. Is mentioned.
Examples of the diisocyanate compound containing an alicyclic hydrocarbon represented by R include 1,4-cyclohexane diisocyanate and 4,4-cyclohexane diisocyanate.
Furthermore, examples of the aromatic diisocyanate compound containing an aromatic hydrocarbon represented by R include 4,4′-diphenylmethane diisocyanate and tolylene diisocyanate.
These diisocyanate compounds may be used alone or in combination of two or more.

In the formula B, as the short chain aliphatic hydrocarbon, alicyclic hydrocarbon, or aromatic hydrocarbon represented by P ′, for example, a short chain aliphatic hydrocarbon having a molecular weight of less than 500, an alicyclic hydrocarbon, Or an aromatic hydrocarbon is mentioned.
P ′ is derived from a diol compound containing P ′.
Examples of the aliphatic diol compound containing a short-chain aliphatic hydrocarbon represented by P ′ include glycol and polyalkylene glycol, such as ethylene glycol, propylene glycol, trimethylene glycol, 1,4-butanediol, 1 , 3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol and 1,10-decanediol. .
Examples of the alicyclic diol compound containing an alicyclic hydrocarbon represented by P ′ include cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane-1,3-diol, Examples include cyclohexane-1,4-diol and cyclohexane-1,4-dimethanol.
Furthermore, examples of the aromatic diol compound containing an aromatic hydrocarbon represented by P ′ include hydroquinone, resorcin, chlorohydroquinone, bromohydroquinone, methylhydroquinone, phenylhydroquinone, methoxyhydroquinone, phenoxyhydroquinone, 4,4′- Dihydroxybiphenyl, 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxydiphenyl sulfide, 4,4′-dihydroxydiphenylsulfone, 4,4′-dihydroxybenzophenone, 4,4′-dihydroxydiphenylmethane, bisphenol A, 1, Examples include 1-di (4-hydroxyphenyl) cyclohexane, 1,2-bis (4-hydroxyphenoxy) ethane, 1,4-dihydroxynaphthalene, and 2,6-dihydroxynaphthalene.
These diol compounds may be used alone or in combination of two or more.

The number average molecular weight of the polymer (polyurethane) constituting the hard segment is preferably 300 to 1500 from the viewpoint of melt moldability. Further, the number average molecular weight of the polymer constituting the soft segment is preferably 500 to 20000, more preferably 500 to 5000, and particularly preferably 800 to 5000, from the viewpoints of flexibility and thermal stability of the polyurethane-based thermoplastic elastomer. 2500. The mass ratio (Hu: Su) to the hard segment (Hu) and the soft segment (Su) is preferably 50:50 to 90:10, and more preferably 50:50 to 80:20, from the viewpoint of moldability. preferable.
The polyurethane-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. As the polyurethane-based thermoplastic elastomer, for example, thermoplastic polyurethane described in JP-A-5-331256 can be used.

The raw material thermoplastic resin material may contain only one kind of the above-mentioned various thermoplastic elastomers, or may use two or more kinds in combination.
The content of the thermoplastic elastomer in the raw material thermoplastic resin material is preferably 50% by mass to 100% by mass, and preferably 70% by mass to 100% by mass with respect to the total mass of the raw material thermoplastic resin material. More preferably, it is more preferably 85% by mass to 100% by mass.

  Raw material thermoplastic resin materials include resins other than thermoplastic elastomers, various fillers (eg, silica, calcium carbonate, clay), anti-aging agents, oils, plasticizers, colorants, weathering agents, and reinforcements, as desired. Various additives such as materials may be included. The resin other than the thermoplastic elastomer may be a thermoplastic resin or a thermosetting resin.

In order to obtain a raw material thermoplastic resin material, one of the above-mentioned thermoplastic elastomers may be used as it is, or added to the thermoplastic elastomer so that the content of the thermoplastic elastomer becomes the above-mentioned ratio. An agent or the like may be added, or two or more thermoplastic elastomers may be mixed.
The biaxial kneader may be charged with a finely pulverized thermoplastic elastomer or additive which is a component of the raw material thermoplastic resin material, or the thermoplastic elastomer and additive are previously kneaded with a Banbury mixer or the like. Then, it may be put into a biaxial kneader.

As described above, in the kneading step in the tire manufacturing method of the present invention, the raw material thermoplastic resin material is kneaded for a predetermined time with a predetermined shearing energy to have a high elastic modulus and a small tan δ. Material can be obtained.
The shear energy can be calculated by various calculation formulas according to the kneading conditions when kneading the raw material thermoplastic resin material.

First, the shear rate γ [sec ⁻¹ ] is calculated from the following formula (I).

In the formula (I), D, N, and h are as follows.
D: Screw diameter (diameter) [mm]
N: Screw rotation speed [rpm]
h: Clearance (distance) between screw and cylinder [mm]

The shear energy E [J / cm ³ ] is obtained from the shear rate γ [sec ⁻¹ ] obtained from the formula (I), the viscosity η of the raw thermoplastic resin material, and the kneading time [sec], or the shear stress τ From [N / m ² ] and kneading time [sec], it can be calculated by the following formula (II).

In the formula (II), η, γ, T, and τ are as follows.
τ: Shear stress [N / m ² ]
η: viscosity of raw material thermoplastic resin material [Pa · sec = (N / m ² ) × sec]
γ: Shear rate [sec ⁻¹ ]
T: Kneading time [sec]

  The “viscosity η of the raw material thermoplastic resin material” is a viscosity based on shear deformation under the kneading conditions (kneading temperature and shear rate) of the raw material thermoplastic resin material, and the measuring method is as described above.

  The thermoplastic resin material obtained by kneading the raw thermoplastic resin material in the kneading step preferably has the following characteristics.

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

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

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

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

  As a deflection temperature under load (at the time of 0.45 MPa load) specified in ISO75-2 or ASTM D648 of the thermoplastic resin material, 50 ° C. or more is preferable, 50 to 150 ° C. is preferable, and 50 to 130 ° C. is more preferable. If the deflection temperature under load of the thermoplastic resin material is 50 ° C. or higher, deformation of the tire frame body can be suppressed even when vulcanization is performed in the manufacture of the tire.

[Tire frame formation process]
The method for producing a tire of the present invention includes a step of forming a tire frame body with a thermoplastic resin material obtained through a kneading step.
The tire skeleton forming step is a step of forming a tire skeleton using the thermoplastic resin material obtained through the kneading step, and the shape of the tire skeleton and the method of forming the tire skeleton are not particularly limited.

For example, injection molding using a thermoplastic resin material in which a tire frame (tire case) composed of a pair of bead parts, side parts, and crown parts is heated to a temperature higher than the melting point of the thermoplastic resin material. Can be formed. The tire frame body may be completed by obtaining a half-symmetrical half body by injection molding and then joining the two.
The tire skeleton forming step will be described in detail according to the embodiment of the tire of the present invention described later.

-Reinforcement cord member winding process-
The tire manufacturing method of the present invention may further include a reinforcing cord member winding step of forming a reinforcing cord layer by winding the reinforcing cord member in the circumferential direction around the outer periphery of the tire frame body.
Examples of the method of winding the reinforcing cord member in the circumferential direction around the outer peripheral portion of the tire frame body include a method of winding the heated reinforcing cord member in a spiral manner around the outer peripheral surface of the crown portion of the tire case with a certain tension. It is done. By winding the heated reinforcing cord member around the outer peripheral surface of the crown portion of the tire case, the tire case is melted or softened, and part or all of the heated reinforcing cord member is embedded in the tire case. The member is fixed to the tire case.
The reinforcing cord member winding step will be described in detail according to an embodiment of the tire of the present invention described later.

The reinforcing cord layer can be configured to include a resin material. As described above, when a tire skeleton body in which a reinforcing cord layer is formed by including a resin material in the reinforcing cord layer, the hardness of the tire and the reinforcing cord layer is compared with the case where the reinforcing cord is fixed with cushion rubber. Therefore, a tire in which the reinforcing cord member is in close contact with and fixed to the tire frame body can be manufactured.
The “resin material” is a concept including a thermoplastic resin (including a thermoplastic elastomer) and a thermosetting resin, and does not include vulcanized rubber.

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

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

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

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

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

  As described above, according to the method for manufacturing a tire of the present invention, the kneading step can provide a thermoplastic resin material that has a high elastic modulus and hardly generates strain even when stress is applied. A tire provided with a tire skeleton obtained by using such a thermoplastic resin material has a high elastic modulus and suppresses rolling resistance. Therefore, an automobile to which such a tire is applied is excellent in handling stability and fuel consumption.

<Tire>
The tire of the present invention is a tire formed of a thermoplastic resin material and having a tire skeleton, wherein the thermoplastic resin material has the hard segment and the soft segment in the molecule. the raw thermoplastic material comprising a thermoplastic ^elastomer, a shear energy of ^{100J / cm 3 ~1000J / cm 3} , a tire is a material obtained by 10 to 30 minutes kneading.
That is, the tire has a tire skeleton obtained by using a thermoplastic resin material obtained by kneading through the kneading step in the tire production method of the present invention described above. Specific aspects of kneading conditions such as shear energy and kneading time in the kneading step, raw material thermoplastic resin material, a kneading apparatus such as a biaxial kneader, and preferred aspects are as described above.
Hereinafter, specific embodiments of the tire of the present invention will be described with reference to the drawings.

[First Embodiment]
First, the tire 10 which concerns on 1st Embodiment of the tire of this invention is demonstrated.
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 portion 21 and the rim flange 22 of the rim 20 shown in FIG. A tire case 17 including a side portion 14 that extends outwardly, and a crown portion 16 (outer peripheral portion) that connects a tire radial direction outer end of one side portion 14 and a tire radial direction outer end of the other side portion 14. I have.

  Here, the tire case 17 of the present embodiment is a thermoplastic resin composed of a polyamide-based thermoplastic elastomer (“UBESTA, XPA9055X1” manufactured by Ube Industries, Ltd.) obtained through the kneading step in the tire manufacturing method of the present invention. It is made of material. In the present embodiment, the tire case 17 is formed of only the thermoplastic resin material according to the present invention. However, the present invention is not limited to this configuration, and the tire case is similar to a conventional general rubber pneumatic tire. You may use the other thermoplastic resin material which has a different characteristic for every 17 site | parts (side part 14, crown part 16, bead part 12, etc.). Further, a reinforcing material (polymer material, metal fiber, cord, nonwoven fabric, woven fabric, etc.) is embedded in the tire case 17 (for example, the bead portion 12, the side portion 14, the crown portion 16 and the like), and the reinforcing material is provided. The tire case 17 may be reinforced.

The tire case 17 of the present embodiment is obtained by joining a pair of tire case halves (tire frame pieces) 17A formed of a thermoplastic resin material obtained through the kneading step in the tire manufacturing method of the present invention. It is. The tire case half 17A is formed by injection molding or the like so that one bead portion 12, one side portion 14, and a half-width crown portion 16 are integrated with each other so as to face each other. It is formed by joining at the tire equator part. The thermoplastic resin material obtained through the kneading step in the tire manufacturing method of the present invention is composed of a polyamide-based thermoplastic elastomer.
The tire case 17 is not limited to the one formed by joining two members, and may be formed by joining three or more members.

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

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

  In the present embodiment, a material having a better sealing property than a thermoplastic resin material constituting the tire case 17 at a portion that contacts the rim 20 of the bead portion 12 or at least a portion that contacts the rim flange 22 of the rim 20, for example, An annular seal layer 24 made of rubber is formed. The seal layer 24 may also be formed at a portion where the tire case 17 (beat portion 12) and the bead sheet 21 are in contact with each other. As a material having a better sealing property than the thermoplastic resin material constituting the tire case 17, a softer material can be used as compared with the thermoplastic resin material constituting the tire case 17. As the rubber that can be used for the seal layer 24, it is preferable to use the same type of rubber as that used on the outer surface of the bead portion of a conventional general rubber pneumatic tire. Further, if the sealing property between the rim 20 can be ensured only with the thermoplastic resin material, the rubber seal layer 24 may be omitted, and the thermoplastic resin (thermoplastic elastomer) having better sealing property than the thermoplastic resin material. May be used. Examples of such 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 thermoplastic resin material constituting the tire case 17 is wound around the crown portion 16 in the circumferential direction of the tire case 17. The reinforcing cord 26 is wound spirally in a state in which at least a part thereof is embedded in the crown portion 16 in a cross-sectional view along the axial direction of the tire case 17, thereby forming a reinforcing cord layer 28. A tread 30 made of a material having higher wear resistance than the thermoplastic resin material constituting the tire case 17, for example, rubber, is disposed on the outer circumferential side of the reinforcing cord layer 28 in the tire radial direction.

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

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

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

  The tire according to the first embodiment uses a thermoplastic resin material obtained through the kneading step in the tire manufacturing method of the present invention, and the tire skeleton system step and the reinforcing cord member winding step described below. Can be obtained.

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

(Reinforcement cord member winding process)
Next, the reinforcing cord winding process will be described with reference to FIG. FIG. 3 is an explanatory diagram for explaining an operation of embedding a reinforcing cord in a crown portion of a tire case using a cord heating device and rollers. In FIG. 3, the cord supply device 56 includes a reel 58 around which the reinforcing cord 26 is wound, a cord heating device 59 arranged on the downstream side of the reel 58 in the code conveyance direction, and a first code arranged on the downstream side of the cord 26 in the conveyance direction. 1 roller 60, a first cylinder device 62 that moves the first roller 60 in a direction of moving toward and away from the outer peripheral surface of the tire, and a first roller 60 disposed downstream of the cord 26 in the conveying direction. 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 into contact with or separates from the tire outer peripheral surface. The second roller 64 can be used as a metal cooling roller. Further, in the present embodiment, the surface of the first roller 60 or the second roller 64 is made of a fluororesin (in this embodiment, Teflon (registered trademark)) in order to suppress adhesion of a molten or softened thermoplastic resin material. ). In the present embodiment, the cord supply device 59 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 either one of the rollers. It is also possible to have only one (that is, one roller).

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

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

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

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

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

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

(Function)
In the tire 10 of the present embodiment, the tire case 17 is formed of the thermoplastic resin material obtained through the kneading step in the tire manufacturing method of the present invention, and thus has a high tensile elastic modulus. In the tire 10 of the present embodiment, tan δ can be reduced and rolling resistance is suppressed. For this reason, when the tire 10 of the present embodiment is applied to an automobile, the steering stability is excellent, and fuel consumption can be suppressed.
Furthermore, since the structure of the tire can be further simplified, the weight is lighter than that of a conventional rubber tire, so that the automobile can be further reduced in fuel consumption.

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

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

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

And since the embedding amount L of the reinforcement cord 26 is 1/5 or more of the diameter D as shown in FIG. 2, the air entry at the time of manufacture is suppressed effectively, the input at the time of driving, etc. This further suppresses the movement of the reinforcing cord 26.
When the reinforcing cord layer 28 is configured to include the thermoplastic resin material as described above, the difference in hardness between the tire case 17 and the reinforcing cord layer 28 compared to the case where the reinforcing cord 26 is fixed with cushion rubber. Therefore, the reinforcing cord 26 can be further adhered and fixed to the tire case 17. Thereby, the above-mentioned air entering can be prevented effectively, and it can control effectively that a reinforcement cord member moves at the time of driving. Furthermore, when the reinforcing cord is a steel cord, the reinforcing cord 26 can be easily separated and recovered from the thermoplastic resin material by heating at the time of disposal of the tire, which is advantageous in terms of recyclability of the tire 10. In addition, the resin material usually has a lower loss coefficient (Tan δ) than vulcanized rubber. For this reason, if the reinforcing cord layer contains a large amount of resin material, the rolling property of the tire can be improved. Furthermore, a resin material having a relatively high elastic modulus as compared with vulcanized rubber has an advantage that the in-plane shear rigidity is large and the stability and wear resistance during running of the tire are excellent.

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

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

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

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

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

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

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

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

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

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

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

  In the tire of the second embodiment, as in the first embodiment, the tire case 17 is a polyamide-based thermoplastic elastomer (manufactured by Ube Industries, Ltd.) obtained through the kneading step in the tire manufacturing method of the present invention. "UBESTA, XPA9055X1"). In the present embodiment, as shown in FIGS. 5 and 6, the tire 200 includes a reinforcing cord layer 28 (indicated by a broken line in FIG. 6) formed by winding a covering cord member 26 </ b> B around the crown portion 16 in the circumferential direction. Are stacked). The reinforcing cord layer 28 constitutes the outer peripheral portion of the tire case 17 and reinforces the circumferential rigidity of the crown portion 16. The outer peripheral surface of the reinforcing cord layer 28 is included in the outer peripheral surface 17S of the tire case 17.

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

  The elastic modulus of the coating resin material 27 is preferably set in the range of 0.1 to 10 times the elastic modulus of the resin material forming the tire case 17. When the elastic modulus of the coating resin material 27 is 10 times or less than the elastic modulus of the thermoplastic resin material forming the tire case 17, the crown portion does not become too hard and rim assembly is facilitated. When the elastic modulus of the coating resin material 27 is 0.1 times or more of the elastic modulus of the thermoplastic resin material forming the tire case 17, the resin constituting the reinforcing cord layer 28 is not too soft and the belt surface Excellent internal shear rigidity and improved cornering force. In the present embodiment, a material similar to the thermoplastic resin material (in this embodiment, “UBESTA, XPA9055X1” manufactured by Ube Industries, Ltd.) 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.

  The tire according to the second embodiment uses a thermoplastic resin material obtained through the kneading step in the tire manufacturing method of the present invention, and the tire skeleton system step and the reinforcing cord member winding step described below. Can be obtained.

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

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

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

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

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

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

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

(Vulcanization process)
(6) Next, the raw tire case is accommodated in a vulcanizing can or mold and vulcanized. At this time, the unvulcanized cushion rubber 29 flows into the roughened irregularities 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, and the bonding strength between the tire case 17 and the cushion rubber 29 is improved. That is, the bonding strength between the tire case 17 and the tread 30 is improved via the cushion rubber 29.

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

(Function)
In the tire 200 of the present embodiment, the tire case 17 is formed of the thermoplastic resin material obtained through the kneading step in the tire manufacturing method of the present invention, and therefore has a high tensile elastic modulus. Further, tan δ can be reduced, and rolling resistance is suppressed. For this reason, when the tire 200 of the present embodiment is applied to an automobile, the steering stability is excellent and fuel consumption can be suppressed. Furthermore, since the structure of the tire can be further simplified, the weight is lighter than that of a conventional rubber tire, so that the automobile can be further reduced in fuel consumption.

  Further, when the reinforcing cord layer 28 includes the covering cord member 26B, the hardness of the tire case 17 and the reinforcing cord layer 28 is higher than that in the case where the reinforcing cord 26A is simply fixed by the cushion rubber 29. Since the difference can be reduced, the covering cord member 26B can be further adhered and fixed to the tire case 17. Thereby, the above-mentioned air entering can be prevented effectively, and it can control effectively that a reinforcement cord member moves at the time of driving. Furthermore, when the reinforcing cord 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 the recyclability of the tire 200. In addition, the resin material usually has a lower loss coefficient (Tan δ) than vulcanized rubber. For this reason, if the reinforcing cord layer contains a large amount of resin material, the rolling property of the tire can be improved. Furthermore, a resin material having a relatively high elastic modulus as compared with vulcanized rubber has an advantage that the in-plane shear rigidity is large and the stability and wear resistance during running of the tire are excellent.

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

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

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

  In the vulcanization step, when the cushion rubber 29 is vulcanized, the cushion rubber 29 flows into the roughened irregularities 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 other than the reinforcing cord layer 28. To do.

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

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

  In the second embodiment described above, the tire case 17 is formed by joining the case divided bodies 17A. However, the present invention is not limited to this configuration, and the tire case 17 is integrally formed using a mold or the like. It may be formed.

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

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

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

In the second embodiment, the coating resin material 27 forming the coating cord member 26B is made of a thermoplastic material, and the coating resin material 27 is heated to be melted or softened so that the outer peripheral surface of the crown portion 16 is coated. Although the cord member 26B is welded, the present invention is not limited to this configuration, and the covering cord member 26B is bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like without heating the coating resin material 27. It is good also as composition to do.
The covering resin material 27 for forming the covering cord member 26B may be a thermosetting resin, and the covering cord member 26B may be bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like without being heated.

  Further, the covering resin material 27 for forming the covering cord member 26B may be a thermosetting resin, and the tire case 17 may be formed of a thermoplastic resin material. In this case, the covering cord member 26B may be bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like, and the portion of the tire case 17 where the covering cord member 26B is disposed is heated to be melted or softened. The covering cord member 26 </ b> B may be welded to the outer peripheral surface of the crown portion 16 in a state.

Further, the covering resin material 27 for forming the covering cord member 26B may be made of a thermoplastic material, and the tire case 17 may be made of a thermoplastic resin material. In this case, the covering cord member 26B may be bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like, and the portion of the tire case 17 where the covering cord member 26B is disposed is heated to be melted or softened. The coating resin material 27 may be heated to a molten or softened state while the coating cord member 26 </ b> B is welded to the outer peripheral surface of the crown portion 16.
In addition, when both the tire case 17 and the covering cord member 26B are heated and melted or softened, the two are mixed well, so that the bonding strength is improved. When both the resin material forming the tire case 17 and the covering resin material 27 forming the covering cord member 26B are thermoplastic resin materials, the same kind of thermoplastic material, particularly the same thermoplastic material is used. It is preferable.

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

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

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

As shown in the first embodiment, the tire of the present invention can be configured as follows.
(1-1) The tire of the present invention, the raw material thermoplastic resin material comprising a thermoplastic elastomer having a hard segment and soft segment in the ^molecule, at a shear energy of ^{100J / cm 3 ~1000J / cm 3} , 10 minutes to Using a thermoplastic resin material obtained by kneading for 30 minutes, in a cross-sectional view along the axial direction of the tire frame body, at least one of the reinforcing cord members is formed on the outer periphery of the tire frame body formed of the thermoplastic resin material. The part can be configured to be embedded.
As described above, when a part of the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body, it is possible to further suppress a phenomenon (air entering) in which air remains around the cord when the reinforcing cord member is wound. When the entry of air into the periphery of the reinforcement cord member is suppressed, the movement of the reinforcement cord member due to input during traveling is suppressed. Thereby, for example, when the tire constituent member is provided on the outer peripheral portion of the tire skeleton body so as to cover the entire reinforcement cord member, the movement of the reinforcement cord member is suppressed. ) Is prevented from being peeled off and the durability is improved.

(1-2) The tire of the present invention may be provided with a tread formed of a material that is more resistant to abrasion 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.

The tire manufacturing method (1-6) The present invention, the raw material thermoplastic resin material comprising a thermoplastic elastomer having a hard segment and soft segment in the ^molecule, at a shear energy of ^{100J / cm 3 ~1000J / cm 3} , A kneading step for kneading for 10 minutes to 30 minutes and a tire skeleton body forming step for forming a tire skeleton body by the thermoplastic resin material obtained through the kneading step are included.
Thus, a thermoplastic resin material having a high elastic modulus and a small tan δ can be obtained by kneading the raw material thermoplastic resin material with the above shear energy for a predetermined time. Therefore, a tire provided with a tire frame obtained using such a thermoplastic resin material has a high elastic modulus, and rolling resistance is suppressed. Therefore, if such a tire is applied to an automobile, an automobile having excellent steering stability and reduced fuel consumption can be obtained.

(1-7) In the tire manufacturing method of the present invention, the tire skeleton forming step includes a tire skeleton piece that constitutes a part of the annular tire skeleton by the thermoplastic resin material obtained through the kneading step. A tire skeleton piece forming step to form, and a tire skeleton piece joining step for forming the tire skeleton by fusing two or more tire skeleton pieces to be paired by applying heat to the joint surfaces of the tire skeleton pieces; Can be configured.
By making the tire frame body a frame body composed of a plurality of tire frame bodies, the production line of the tire frame body can be reduced to a small scale.

(1-8) The tire manufacturing method according to the present invention further includes a reinforcing cord in which a reinforcing cord layer is formed by winding a reinforcing cord member around the outer periphery of the tire frame body in the circumferential direction after the tire frame body forming step. It can be set as the structure including a member winding process.
Thus, a stronger tire can be manufactured by winding the reinforcing cord member around the outer periphery of the tire frame to form the reinforcing cord layer.

(1-9) The method for manufacturing the tire is configured such that, in the tire frame piece bonding step, the bonding surface of the tire frame piece is heated to a temperature equal to or higher than a melting point of the thermoplastic resin material forming the tire frame piece. Can do.
As described above, when the joining surface of the divided body is heated to a temperature equal to or higher than the melting point of the thermoplastic resin material constituting the tire frame piece, the tire frame pieces can be sufficiently fused with each other. The productivity of the tire can be increased while improving.

(1-10) In the tire manufacturing method, in the reinforcing cord member winding step, at least one of the reinforcing cord members while melting or softening an outer peripheral portion of the tire frame body formed in the tire frame piece joining step. The reinforcing cord member can be wound around the outer peripheral portion of the tire frame body by burying the portion.
In this way, at least a part of the reinforcing cord member was embedded while melting or softening the outer peripheral portion of the tire frame body, and the reinforcing cord member was wound around the outer peripheral portion of the tire frame body. At least a part of the reinforcing cord member can be welded to the molten or softened thermoplastic resin material. Thereby, the air entering between the outer peripheral part of the tire frame and the reinforcing cord member can be further suppressed in a cross-sectional view along the axial direction of the tire frame. Moreover, when the portion in which the reinforcing cord member is embedded is cooled and solidified, the fixing degree of the reinforcing cord member embedded in the tire frame body is improved.

(1-11) 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 sectional view along the axial direction of the tire frame body. It can comprise so that it may embed | buy in an outer peripheral part.
As described above, when the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body by 1/5 or more of the diameter in a cross-sectional view along the axial direction of the tire frame body, it is effective for the air to enter the periphery of the reinforcement cord during manufacturing In addition, the embedded reinforcing cord member can be made difficult to come off from the tire frame body.

(1-12) The tire manufacturing method may be configured to embed the heated reinforcing cord member in the tire frame body in the reinforcing cord member winding step.
Thus, in the reinforcing cord winding step, when the reinforcing cord member is embedded in the tire frame body while heating, the contact portion melts or softens when the heated reinforcing cord member contacts the outer periphery of the tire frame body. Therefore, the reinforcing cord member can be easily embedded in the outer peripheral portion of the tire frame body.

(1-13) The tire manufacturing method may be configured to heat a portion of the outer periphery of the tire frame body where the reinforcing cord member is embedded in the cord member winding step.
Thus, by heating the portion where the reinforcement cord member is embedded in the outer peripheral portion of the tire frame body, the heated portion of the tire frame body is melted or softened, so that the reinforcement cord member is easily embedded.

(1-14) In the tire manufacturing method, in the cord member winding step, the reinforcement 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.

(1-15) According to the manufacturing method, in the cord member winding step, after the reinforcing cord member is wound around the tire frame body, the melted or softened portion of the outer peripheral portion of the tire frame body is cooled. Can be configured to.
As described above, after the reinforcing cord member is embedded, the melted or softened portion of the outer peripheral portion of the tire frame body is forcibly cooled, so that the molten or softened portion of the outer peripheral portion of the tire frame body is naturally cooled. It can be quickly cooled and solidified. By cooling the tire outer peripheral portion faster than natural cooling, it is possible to suppress deformation of the outer peripheral portion of the tire frame body and to suppress movement of the reinforcing cord member.

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

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

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

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

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

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

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

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

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

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to this.
First. According to the first embodiment described above, tires of examples and comparative examples were molded. At this time, the materials described in Table 1 below were used as materials for forming the tire case. The thermoplastic resin material used for forming the tire case (tire frame) was obtained by kneading the raw material thermoplastic resin material containing the thermoplastic elastomer shown in Table 1 below under the kneading conditions shown in Table 1 below. A thermoplastic resin material was used.
In addition, a sample piece of 40 mm × 80 mm and a thickness of 2 mm having the same component composition as the tire case formed under the same conditions as in the examples and comparative examples was prepared, and the tensile strength, breaking elongation, tensile modulus, breaking state, and tan δ Was evaluated. The preparation method of each sample piece, each evaluation method, and evaluation conditions are as follows.

<Preparation of sample piece>
The following thermoplastic elastomer was prepared as a constituent component of the raw material thermoplastic resin material.
1. Polyamide-based thermoplastic elastomer UBESTA, XPA9048X1 manufactured by Ube Industries, Ltd.
2. Polyamide-based thermoplastic elastomer Ube Industries, UBESTA, XPA9055X1
3. Polyester thermoplastic elastomer, made by Toray DuPont, Hytrel 5557

  The thermoplastic elastomer having the composition shown in Table 1 was put into a twin screw extruder manufactured by Technobel Co., Ltd. and kneaded under the conditions shown in Table 1 to obtain pellets.

“Shear energy E” [J / cm ³ ] in the “Kneading conditions” column of Table 1 is the viscosity η, shear rate γ [sec ⁻¹ ] and kneading time [min] of the raw thermoplastic resin material shown in Table 1. From the above, it is a value calculated based on the above-mentioned formula (I) and formula (II).

  Moreover, the viscosity (η) of each raw material thermoplastic resin material having the composition shown in Table 1 was measured as a viscosity based on shear deformation in each kneading condition (kneading temperature and shear rate) of each raw material thermoplastic resin material. For the measurement, a capillograph manufactured by Toyo Seiki Co., Ltd. was used. The results are shown in Table 1.

  Next, using the pellets of the prepared examples and comparative examples, with an injection molding machine (SE30D injection molding machine manufactured by Sumitomo Heavy Industries, Ltd.), a molding temperature (cylinder temperature) of 180 ° C. to 270 ° C., a mold temperature of 60 ° C., A plate-like sample having a thickness of 2 mm, a width of 30 mm, and a length of 100 mm was formed, and the obtained plate-like sample was punched into a circular test piece having a diameter of 6 and a No. 5 dumbbell shape defined in JIS K6251-1993. A shape test piece was prepared.

[1. (Evaluation of tensile strength, elongation at break, tensile modulus, and breakability)
A sample piece obtained by the above hot press was punched out to produce a dumbbell-shaped test piece (No. 5 type test piece) defined in JIS K6251-1993.
By using Shimadzu Corporation, Shimadzu Autograph, AGS-J (5KN) and pulling the obtained dumbbell-shaped test piece at a tensile speed of 200 mm / min, the tensile strength, breaking elongation, and tensile modulus of the sample piece are obtained. And, the breaking state (breakability) was investigated.

The breaking property was evaluated based on the following evaluation criteria by visually observing the broken state of the cross section of the sample piece.
-Evaluation criteria-
Ductility: The sample piece was broken by ductile fracture (◯).
Layered: The sample piece was broken by layered fracture (Δ).
Brittleness: The sample piece was broken by brittle fracture (x).

[2. tan δ measurement)
The sample piece obtained by the hot press was punched out to produce a circular test piece having a diameter of 6 mm.
Using the obtained circular test piece, a loss tangent at a temperature of 20 ° C., a measurement frequency of 35 Hz, and a dynamic strain of 1% using a dynamic viscoelasticity measurement tester “ARES III” manufactured by Rheometrics Co., Ltd. tan δ) was measured.

Table 1 shows the results of tensile strength, elongation at break, tensile modulus, rupture state, and tan δ evaluated as described above.
In Table 1, “Tm” in the “Raw material thermoplastic resin” column is a numerical value obtained as follows.

[3. Measurement of melting point (Tm) of polymer constituting hard segment of thermoplastic elastomer as component of raw material thermoplastic resin material]
"Ube Industries, UBESTA, XPA9048X1", "Ube Industries, UBESTA, XPA9055X1" and "Toray DuPont, Hytrel 5557" The polymer that constitutes the hard segment of the polymer that constitutes the hard segment The melting point was measured based on ASTM D3418-8 using a differential scanning calorimeter DSC manufactured by Rigaku Corporation. The temperature of the detection part of the apparatus was corrected using the melting points of indium and zinc, and the heat quantity was corrected using the heat of fusion of indium. The polymer to be measured was placed on an aluminum pan, an empty pan was set for control, and the measurement was performed at a heating rate of 10 ° C./min.

As can be seen from Table 1, the sample piece of the example using the thermoplastic resin material that has undergone the kneading step in the tire manufacturing method of the present invention has a higher elastic modulus and tan δ than the sample piece of the comparative example. It was small.
Therefore, a tire made using the same thermoplastic resin material as the sample piece shown in the examples has a high elastic modulus, a rolling resistance is suppressed, and when such a tire is applied to an automobile, it has excellent steering stability. It is understood that low fuel consumption can be expressed.
In addition, when the drum running test was done about each tire formed using each thermoplastic resin material of an Example and a comparative example, the safety | security on driving | running | working did not have any problem.

10,200 tire 12 bead part 16 crown part (outer peripheral part)
17 Tire case (tire frame)
18 Beadcore
20 Rim 21 Bead sheet 22 Rim flange 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 (12)

The raw thermoplastic material comprising a thermoplastic elastomer having a hard segment and soft segment in the ^molecule, at a shear energy of ^{100J / cm 3 ~1000J / cm 3} , a kneading step for 10 to 30 minutes kneading,
With the thermoplastic resin material obtained through the kneading step, a tire skeleton forming step for forming a tire skeleton,
The manufacturing method of the tire containing this. 2. The tire manufacturing method according to claim 1, wherein the raw thermoplastic resin material is kneaded using a biaxial kneader equipped with a screw having a shear rate of 200 sec ^{−1 to} 3000 sec ⁻¹ .  The tire manufacturing method according to claim 1 or 2, wherein the raw material thermoplastic resin material is kneaded at a temperature higher by 5 ° C to 50 ° C than a melting point of a polymer constituting a hard segment of the thermoplastic elastomer.   The method for manufacturing a tire according to claim 2 or 3, wherein the screw included in the biaxial kneader has a ratio (L / D) of a screw length L to a screw diameter D of 60 to 150.   The method for manufacturing a tire according to claim 3 or 4, wherein the polymer constituting the hard segment of the thermoplastic elastomer has a melting point of 150 ° C to 300 ° C.   The tire manufacturing method according to claim 4 or 5, wherein the screw length L in the screw is 1200 mm to 6000 mm. A tire formed of a thermoplastic resin material and having a tire skeleton,
Said thermoplastic resin material, the raw material thermoplastic resin material comprising a thermoplastic elastomer having a hard segment and soft segment in the ^molecule, at a shear energy of ^{100J / cm 3 ~1000J / cm 3} , to 10 to 30 minutes kneading The tire which is a material obtained by this. The tire according to claim 7, wherein the raw material thermoplastic resin material is kneaded using a biaxial kneader equipped with a screw having a shear rate of 200 sec ^{−1 to} 3000 sec ⁻¹ .  The tire according to claim 7 or 8, wherein the raw material thermoplastic resin material is kneaded at a temperature higher by 5 ° C to 50 ° C than a melting point of a polymer constituting a hard segment of the thermoplastic elastomer.   10. The tire according to claim 8, wherein a screw included in the biaxial kneader has a ratio between a screw length L and a screw diameter D (L / D is 60 to 150).   The tire according to claim 9 or 10, wherein a melting point of a polymer constituting a hard segment of the thermoplastic elastomer is 150 ° C to 300 ° C.   The tire according to claim 10 or 11, wherein the screw length L of the screw is 1200 mm to 6000 mm.