JP2018079899A - tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire excellent in high speed durability and side cut resistance while using a resin material in a tire skeleton.SOLUTION: A tire has an annular tire skeleton 10 formed from a resin composition containing 50-100 mass% of a resin material, a reinforcement layer 20 provided outside of the tire radial direction of the tire skeleton 10 and a rubber surface layer 30 which is provided on the outside of the tire radial direction of the reinforcement layer 20 and contains at least a tread rubber 32 and a side rubber 34, where the reinforcement layer 20 is formed by covering a reinforcement member 21 with the resin composition containing 50-100 mass% of the resin material, and the side rubber 34 has a loss tangent tanδ(y) with dynamic distortion of 1% at an initial load of 160 mg, a frequency of 52 Hz and 25°C and a storage elastic modulus E'(x) with dynamic distortion of 1% at 25°C satisfying expression (1): [0.009x+0.0254<y<0.009x+0.27].SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tire.

In recent years, tires using resin materials such as thermoplastic resins and thermoplastic elastomers have been developed because of their light weight and ease of recycling.
For example, in Patent Document 1 below, a tire having a reinforcing cord layer (reinforcing layer) on the outer peripheral portion of an annular tire frame body, the tire frame body being formed of a resin material, and further, a resin material is also used for the reinforcement layer. The tire used is disclosed.

JP 2012-046030 A

However, a tire using a resin material for the tire frame or the reinforcing layer is excellent in low loss properties, etc., but the resin material softens when the tire becomes hot due to heat generation during running, etc. There is room for improvement in durability (hereinafter referred to as “high-speed durability”).
On the other hand, in order to improve the high-speed durability of the tire, a means of using rubber (rubber surface layer) excellent in low loss property for the layer surface layer covering the tire surface can be considered, but the rubber surface layer is simply When the loss is reduced, the storage elastic modulus (E ') of the rubber surface layer is reduced, and the tire shoulder, bead, and their peripheral members are greatly distorted, so the high-speed durability of the tire is sufficiently improved. I couldn't let you.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems of the prior art and to provide a tire that is excellent in high-speed durability and excellent in side cut resistance while using a resin material for a tire frame.

The gist configuration of the present invention for solving the above problems is as follows.
<1> An annular tire skeleton formed of a resin composition containing 50 to 100% by mass of a resin material;
A reinforcing layer provided on the outer side in the tire radial direction of the tire skeleton,
A rubber surface layer provided on the outer side of the reinforcing layer in the tire radial direction and including at least a tread rubber and a side rubber;
With
The reinforcing layer is a resin composition containing a resin material in an amount of 50 to 100% by mass, and covers the reinforcing member.
The side rubber has a loss tangent tanδ at an initial load of 160 mg, a frequency of 52 Hz, and a dynamic strain of 1% at 25 ° C., and an initial load of 160 mg, a storage elastic modulus E ′ at a frequency of 52 Hz and a dynamic strain of 1% at 25 ° C. of the following formula (1 It is a tire satisfying.
0.009x + 0.0254 <y <0.009x + 0.27 (1)
[In the formula (1), x represents the storage elastic modulus E ′ at an initial load of 160 mg, frequency of 52 Hz, and dynamic strain of 1% at 25 ° C., y represents the initial load of 160 mg, frequency of 52 Hz, and dynamic strain of 1% at 25 ° C. Represents the loss tangent tan δ. ]

  Since the side rubber has the above characteristics, even if the tire skeleton is made of a resin composition containing a resin material, the tire has excellent high-speed durability and excellent side cut resistance.

<2> The storage elastic modulus E ′ of the side rubber when the initial load is 160 mg, the frequency is 52 Hz, and the dynamic strain is 1% at 25 ° C., and y is the loss tangent when the initial load is 160 mg, the frequency is 52 Hz and the dynamic strain is 1% when the temperature is 1%. The tire according to <1>, wherein tan δ is less than 0.17.

  Since the side rubber has the above characteristics, the tire is excellent in high speed durability and side cut resistance.

<3> The side rubber is composed of a rubber composition for a side rubber, and the rubber composition for a side rubber contains 0.1 to 5.5 parts by mass of an organic acid with respect to 100 parts by mass of the rubber component <1> or The tire according to <2>.

  Since the amount of organic acid in the rubber composition for the side rubber is within the above range, the migration of the organic acid from the side rubber to the resin material can be suppressed, the deterioration of the reinforcing layer can be suppressed, and the tire has high-speed durability. Excellent side cut resistance.

<4> The side rubber comprises a rubber composition for side rubber, and the rubber composition for side rubber contains 0.1 to 5.5 parts by mass of a vulcanization accelerator with respect to 100 parts by mass of the rubber component <1. The tire according to any one of> to <3>.

  When the amount of the vulcanization accelerator in the rubber composition for the side rubber is within the above range, the transition of the vulcanization accelerator from the side rubber to the resin material can be suppressed, and the deterioration of the reinforcing layer can be suppressed. Superior high-speed durability and side cut resistance.

<5> The tire according to any one of <1> to <4>, wherein the reinforcing member is wound in a tire circumferential direction.

  Since the reinforcing member is wound in the tire circumferential direction, the puncture resistance, cut resistance, and circumferential rigidity of the tire are improved, and the circumferential rigidity is improved, so that the creep of the tire frame body is improved. It can also be suppressed.

<6> The tire according to any one of <1> to <5>, wherein the resin composition used for at least one of the reinforcing layer and the tire skeleton includes at least one of a thermoplastic resin and a thermoplastic elastomer. is there.

  When the resin composition contains at least one of a thermoplastic resin and a thermoplastic elastomer, the tire is lightened and easily recycled.

<7> The tire according to <6>, wherein at least one of the thermoplastic resin and the thermoplastic elastomer is a polyamide, a polyester, a polyolefin, or a polyurethane.

  When at least one of the thermoplastic resin and the thermoplastic elastomer is a polyamide-based, polyester-based, or polyurethane-based material, the reinforcing layer and the tire skeleton can be more easily recycled.

  According to the present invention, it is possible to provide a tire that is excellent in high-speed durability and side cut resistance while using a resin material for the tire frame.

It is sectional drawing of one Embodiment of the tire of this invention. It is the enlarged view to which a part of sectional view of one embodiment of the tire of the present invention was expanded.

Below, the tire of this invention is illustrated and demonstrated in detail based on the embodiment.
FIG. 1 is a cross-sectional view of an embodiment of a tire according to the present invention. FIG. 2 shows an enlarged view of a part of FIG. The reference numerals in FIG. 2 are the same as the reference numerals in FIG. Hereinafter, description will be made with reference to FIG.
The tire shown in FIG. 1 is a toroid between a pair of bead cores 14, a tire skeleton 10, a reinforcing layer 20 provided outside the tire skeleton 10 in the tire radial direction, and a tire radial outside of the reinforcing layer 20. A carcass layer 40 extending in a shape, and a rubber surface layer 30 provided outside the carcass layer 40 in the tire radial direction.

A tire skeleton 10 of the tire shown in FIG. 1 is formed in an annular shape, and in a cross section in the tire width direction, a pair of bead portions 11 and a pair of side portions 12 connected to the outside in the tire radial direction of the bead portion 11. And the crown portion 13 that is connected to the inner side in the tire width direction of the side portion 12 and connects the outer ends in the tire radial direction of the side portions 12, and the reinforcing layer 20 is disposed on the outer side in the tire radial direction of the crown portion 13. Is provided. The tire frame 10 is made of a resin composition containing 50 to 100% by mass of a resin material. Here, when simply expressed as “resin”, the “resin” is a concept including a thermoplastic resin, a thermoplastic elastomer, and a thermosetting resin, and does not include vulcanized rubber. The same applies to the resin composition constituting the coating layer 22 described later. When the tire skeleton 10 is made of the resin composition, the tire can be reduced in weight, and the tire can be easily recycled.
An annular bead core 14 similar to a general tire is embedded in the bead portion 11, and a steel cord or the like can be used for the bead core 14.

The tire reinforcing layer 20 shown in FIGS. 1 and 2 includes a reinforcing member 21 and a covering layer 22 covering the reinforcing member 21. Here, a resin composition containing 50 to 100% by mass of a resin material is used for the covering layer 22 of the reinforcing layer 20. The resin composition used for the coating layer 22 and the resin composition used for the tire skeleton 10 may be the same or different.
The reinforcing member 21 is preferably wound in the tire circumferential direction. Since the reinforcing member 21 is wound in the tire circumferential direction, the puncture resistance, cut resistance, and circumferential rigidity of the tire are improved, and the circumferential rigidity is improved, so that the creep of the tire frame body is improved. Can also be suppressed.

The rubber surface layer 30 in FIG. 1 includes a tread rubber 32 that is a rubber of a tread portion that is in contact with a road surface, and a side rubber 34 that is a rubber of a sidewall portion that particularly requires bending resistance among the rubbers constituting the rubber surface layer 30. And a gum chafer 36 that is a rubber of the chafer portion that protects the tire frame from friction with the rim.
The rubber surface layer 30 is provided on the outer side in the tire radial direction of the reinforcing layer 20 in the tread portion, and on the outer side in the tire radial direction of the tire frame body 10 in the sidewall portion and the chafer portion.

A carcass layer 40 extending in a toroidal shape between the pair of bead cores 14 is provided between the tire frame body 10 and the rubber surface layer 30 outside the reinforcing layer 20 in the tire radial direction.
1 and 2, the carcass layer 40 includes a carcass layer 40a and a carcass layer 40b that overlap in a band including a tire equator (a line that is perpendicular to the tire rotation axis and passes through the center of the tire tread). However, the carcass layer 40 may be composed of one continuous layer.
The carcass layer 40 includes a carcass ply and a carcass ply coating rubber that covers the carcass ply. The carcass ply is usually formed using a cord such as an organic fiber cord (polyester, rayon, etc.) or a steel cord.
Hereinafter, description will be made with the reference numerals omitted.

<Rubber surface layer>
In the present invention, the rubber surface layer includes at least a tread rubber and a side rubber, and may further include a gum chafer.
Tread rubber, side rubber, gum chafer, and carcass ply coating rubber are all vulcanized rubber. The rubber composition constituting the side rubber before vulcanization is referred to as a rubber composition for side rubber. That is, the rubber obtained by vulcanizing the rubber composition for side rubber is the side rubber. The same applies to tread rubber, gum chafer, and carcass ply coating rubber.
Unless otherwise specified, the “rubber” means vulcanized rubber, and the rubber composition is in an unvulcanized or semi-vulcanized state. Here, vulcanized means a state where the degree of vulcanization required for the final product has been reached, and a semi-vulcanized state has a higher degree of vulcanization than the unvulcanized state, A state where the required degree of vulcanization has not been reached.

[Side rubber]
The side rubber has a storage elastic modulus E ′ (x) under the same conditions as a loss tangent tan δ (y) at an initial load of 160 mg, a frequency of 52 Hz, and a dynamic strain of 1% at 25 ° C., with the formula (1) [0.009x + 0.0254 < y <0.009x + 0.27] is satisfied.
Hereinafter, when simply referred to as “tan δ” and “E ′”, the “loss tangent tan δ at an initial load of 160 mg, a frequency of 52 Hz and a dynamic strain of 1% at 25 ° C.” and the “initial load of 160 mg, a frequency of 52 Hz and a temperature of 25 ° C., respectively. It refers to the storage elastic modulus E ′ when the dynamic strain is 1%.
By using the side rubber satisfying tan δ, E ′ and the formula (1), the high speed durability and side cut resistance of the tire using the resin composition containing 50 to 100% by mass of the resin material for the reinforcing layer and the tire frame body are obtained. Can be improved.

  The tire frame forms the basic shape of the tire, and the reinforcing layer plays a role of improving the circumferential rigidity of the tire frame. In the present invention, a resin composition containing 50 to 100% by mass of a resin material is used for the tire frame and the reinforcing layer. By using a resin material for the tire skeleton and the reinforcing layer, the tire is lighter and has a lower loss and the like than a conventional rubber tire. On the other hand, when the tire rotates at a high speed and the tire becomes high temperature due to friction between the tire and the road surface, the resin material softens, so that the high-speed durability tends to be low. In order to improve the high-speed durability of the tire, a means of applying a low loss rubber with low tan δ to the side rubber can be considered. However, if the low loss rubber is simply applied to the side rubber, the storage elastic modulus (E ′) of the side rubber is likely to decrease. It was. Therefore, when the tire receives an impact from the axial direction of the tire, the side rubber may be damaged (side cut) such as a crack.

On the other hand, the rubber surface layer covering at least a part of the tire includes the side rubber having the characteristic satisfying the above formula (1), so that the distortion of the side rubber can be suppressed while suppressing the heat generation of the tire. . Therefore, the strength of the side rubber can be maintained while suppressing the softening of the resin material contained in the tire frame body and the reinforcing layer. As a result, it is considered that the tire is excellent in high-speed durability and further improved in side cut resistance.
In the side rubber, when E ′ (x) is taken on the horizontal axis and tan δ (y) is taken on the vertical axis, if the tan δ (y) of the side rubber becomes “0.009x + 0.0254” or less, the side rubber is reduced in loss. , E ′ also decrease and the distortion of the side rubber increases, so that the high-speed durability and side cut resistance of the tire cannot be improved. When the tan δ (y) of the side rubber is equal to or greater than “0.009x + 0.27”, the distortion of the side rubber is suppressed, but it is difficult to suppress the heat generation of the side rubber, and the softening of the resin material included in the tire frame and the reinforcing layer is suppressed. I can't.
The side rubber preferably satisfies the formula (2).
0.009x + 0.070 ≦ y ≦ 0.009x + 0.180 (2)

In the present invention, it is further preferable that the tan δ of the side rubber is less than 0.17. When the tan δ of the side rubber is less than 0.17, the heat generation of the tire is further suppressed, and the high speed durability of the tire is more excellent.
It is preferable that E ′ of the side rubber is 1 to 10 MPa. When the side rubber E ′ is 1 MPa or more, the distortion of the side rubber is reduced, the side cut resistance is excellent, and when it is 10 MPa or less, the side rubber becomes too hard, and a load is applied to the tire frame. It is possible to suppress a load from being applied to a surface rubber layer such as a tread rubber adjacent to the tire, and it is difficult to impair the durability of the tire.
From the viewpoint of further improving the high speed durability and side cut resistance of the tire, the tan δ of the side rubber is more preferably 0.05 to 0.25, and E ′ is more preferably 4 to 7 MPa.

  As the side rubber, a rubber composition (a rubber composition for a side rubber) in which the type or blend ratio of the rubber component and the type or blending amount of the compounding agent are adjusted so as to satisfy the formula (1) can be used. Similarly, the rubber composition in which the type or blend ratio of the rubber component and the type or amount of the compounding agent are adjusted so that the tread rubber, the gum chafer, and the carcass ply coating rubber have the characteristics corresponding to each function. Things can be used.

[Rubber component]
Here, as the rubber component, in addition to isoprene-based rubbers such as natural rubber (NR), high-purity natural rubber (HPNR), synthetic isoprene rubber (IR), liquid isoprene rubber (L-IR), etc. Synthetic diene rubbers such as polybutadiene rubber (BR), high cis polybutadiene rubber (high cis BR), styrene-butadiene copolymer rubber (SBR), styrene-isoprene copolymer rubber (SIR) can be used. Synthetic rubber can also be used. These rubber components may be used alone or in a blend of two or more.
In particular, in the rubber composition for side rubber, it is preferable to use a mixture of natural rubber (NR) and synthetic rubber from the viewpoint of obtaining a side rubber satisfying the formula (1). Among the synthetic rubbers, polybutadiene rubber (BR) is preferable.
In this case, the content of the natural rubber in the rubber component is preferably 20 to 80% by mass. When the content of the natural rubber (NR) is in the above range, the side rubber easily satisfies the formula (1) in combination with the content of the filler described later. The content of the natural rubber in the rubber component is more preferably 20% by mass or more and less than 50% by mass.

[filler]
Examples of the filler include carbon black and silica.
In the side rubber composition, the filler is preferably contained in an amount of 20 to 60 parts by mass, and preferably 30 to 60 parts by mass with respect to 100 parts by mass of the rubber component. By being in this range, the side rubber can easily satisfy the formula (1).

(Carbon black)
Examples of the carbon black used in the rubber composition for the side rubber include HAF (nitrogen adsorption specific surface area: 75 to 80 m ² / g), HS-HAF (nitrogen adsorption specific surface area: 78 to 83 m ² / g), and LS-HAF. (Nitrogen adsorption specific surface area: 80 to 85 m ² / g), FEF (nitrogen adsorption specific surface area: 40 to 42 m ² / g), GPF (nitrogen adsorption specific surface area: 26 to 28 m ² / g), N339 (nitrogen adsorption specific surface area) : 88 to 96 m ² / g), LI-HAF (nitrogen adsorption specific surface area: 73 to 75 m ² / g), IISAF (nitrogen adsorption specific surface area: 97 to 98 m ² / g), HS-IISAF (nitrogen adsorption specific surface area: 98-99m < ² > / g) etc. are mentioned.
These carbon blacks may be used alone or in combination of two or more.
The side rubber is required to be flexible because it is repeatedly bent and strained, and it is desirable that the heat generated by the deformation is small. From this viewpoint, it is preferable to use carbon black having a relatively large particle size (small nitrogen adsorption specific surface area).
In particular, from the viewpoint of satisfying the formula (1) because the side rubber easily satisfies the high speed durability and the side cut resistance of the tire, among the above carbon blacks, it is preferable to use FEF and HAF as the rubber composition for the side rubber. .

(silica)
In addition to carbon black, if desired, silica may be added to the rubber composition for the side rubber, and 10 parts by mass or less of silica can be included with respect to 100 parts by mass of the rubber component of the rubber composition for the side rubber.
As silica, wet silica, dry silica, and colloidal silica are preferably used, and wet silica is particularly preferably used. The BET specific surface area (measured in accordance with ISO 5794/1) of silica is preferably 40 to 350 m ² / g. Silica having a BET surface area within this range has an advantage that both rubber reinforcement and dispersibility in a rubber component can be achieved. In this respect, BET surface area is more preferably silica in the range of 80~350m ² / g, silica BET surface area in the range of 120~350m ² / g is particularly preferred. Examples of such silica include Tosoh Silica Co., Ltd., trade name “Nipsil AQ” (BET specific surface area = 220 m ² / g), “Nipsil KQ”, Degussa trade name “Ultra Gil VN3” (BET specific surface area = 175 m ^2. / G) and other commercial products can be used.

[Vulcanizing agent]
Examples of the vulcanizing agent include sulfur.
Side rubber is particularly required to have bending resistance among the rubbers constituting the rubber surface layer, and the rubber composition for side rubber has strength against bending while being required to have strength against bending. From the viewpoint of having excellent side cut resistance and high-speed durability, the vulcanizing agent is preferably contained in an amount of 0.1 to 5 parts by mass with respect to 100 parts by mass of the rubber component. If the content of the vulcanizing agent is 0.1 parts by mass or more, it can be sufficiently vulcanized, and if it is 5 parts by mass or less, the overvulcanized state can be prevented and the rubber composition can be prevented from being hard and brittle. . From the above viewpoint, the vulcanizing agent is more preferably 0.5 to 2.5 parts by mass, and still more preferably 0.7 to 2.2 parts by mass.

In addition to the fillers and vulcanizing agents described above, compounding agents commonly used in the rubber industry, such as organic acids, softeners, anti-aging agents, zinc oxide, are included in the rubber composition. (Zinc flower), a vulcanization accelerator, etc. are mentioned.
Examples of the organic acid include carboxylic acids such as stearic acid.
Examples of the softener include mineral-derived mineral oil, petroleum-derived aromatic oil, paraffin oil, naphthenic oil, natural product-derived palm oil, and the like.
As the vulcanization accelerator, 2-mercaptobenzothiazole (M), dibenzothiazolyl disulfide (DM), N-cyclohexyl-2-benzothiazolylsulfenamide (CZ), N-tert-butyl-2-benzo Examples include thiazole vulcanization accelerators such as thiazolylsulfenamide (NS), and guanidine vulcanization accelerators such as 1,3-diphenylguanidine (DPG).

  The rubber composition can be produced, for example, by using a Banbury mixer, a roll or the like, kneading the rubber component with various compounding agents appropriately selected as necessary, followed by heating, extruding, and the like. it can. By molding the rubber composition into a desired shape and vulcanizing it, a tread rubber, a side rubber, a gum chafer, and a carcass ply coating rubber can be produced. Vulcanization of each rubber composition includes, for example, a tire skeleton body and a reinforcing layer, a carcass ply coated with a rubber composition for carcass ply coating rubber, a rubber composition for tread rubber, a rubber composition for side rubber, and a chain. The rubber composition for fur can be carried out after molding an unvulcanized tire arranged at the position shown in FIG. Further, by carving a carcass ply having a fiber cord, a carcass layer composed of a fiber cord / rubber composite, a vulcanized rubber surface layer, a tire frame body, and a reinforcing layer can be assembled. Good.

[Organic acid]
The side rubber is composed of a rubber composition for side rubber, and the rubber composition for side rubber preferably contains 0.1 to 5.5 parts by mass of an organic acid with respect to 100 parts by mass of the rubber component.
From the viewpoint of accelerating the vulcanization of the rubber composition, the rubber composition for a side rubber usually contains 0.1 part by mass or more of an organic acid with respect to 100 parts by mass of the rubber component, and the organic acid remains in the side rubber. Tend to. Since the organic acid is usually a low-molecular carboxylic acid typified by stearic acid, if the amount of the organic acid in the side rubber is large, the organic acid may ooze out from the side rubber. The amount of the organic acid in the rubber composition for the side rubber is 5.5 parts by mass or less with respect to 100 parts by mass of the rubber component, so that the exudation of the organic acid from the side rubber can be suppressed. It is possible to suppress deterioration of the resin material due to the organic acid, and to further improve the high speed durability and side cut resistance of the tire.

The amount of organic acid in the rubber composition for side rubber is more preferably 0.5 to 5.0 parts by mass with respect to 100 parts by mass of the rubber component. It can be said that the amount of organic acid in the rubber composition for a side rubber is 0.5 parts by mass or more with respect to 100 parts by mass of the rubber component, the vulcanized state of the side rubber is higher, and the durability of the tire is excellent. Since the amount of the organic acid in the rubber composition for the side rubber is 5.0 parts by mass or less with respect to 100 parts by mass of the rubber component, the amount of the organic acid oozing out from the side rubber can be further reduced. Deterioration can be further suppressed, and high-speed durability of the tire can be further improved.
The organic acid in the rubber composition is contained in, for example, natural rubber that can be used as a rubber component, in addition to stearic acid as a compounding agent.

[Vulcanization accelerator]
The side rubber is composed of a rubber composition for side rubber, and the rubber composition for side rubber preferably contains 0.1 to 5.5 parts by mass of a vulcanization accelerator with respect to 100 parts by mass of the rubber component.
From the viewpoint of accelerating the vulcanization of the rubber composition, the rubber composition for the side rubber usually contains 0.1 part by mass or more of a vulcanization accelerator with respect to 100 parts by mass. The vulcanization accelerator remains. As already exemplified, vulcanization accelerators are usually low molecular weight compounds typified by 1,3-diphenylguanidine. Therefore, if the amount of vulcanization accelerator in the side rubber is large, vulcanization acceleration from the side rubber is promoted. The agent may ooze out. The amount of the vulcanization accelerator in the rubber composition for the side rubber is 5.5 parts by mass or less with respect to 100 parts by mass of the rubber component, so that the bleeding of the vulcanization accelerator from the side rubber can be suppressed. Deterioration of the resin material due to the vulcanization accelerator that oozes out from the side rubber can be suppressed, and the high-speed durability and side cut resistance of the tire can be further improved.

  The amount of vulcanization accelerator in the rubber composition for side rubber is preferably 1.0 to 5.0 parts by mass with respect to 100 parts by mass of the rubber component. If the amount of the vulcanization accelerator in the rubber composition for the side rubber is 1.0 part by mass or more with respect to 100 parts by mass of the rubber component, it can be said that the vulcanized state of the side rubber is higher and the tire has excellent durability. Since the amount of the vulcanization accelerator in the rubber composition for the side rubber is 5.0 parts by mass or less with respect to 100 parts by mass of the rubber component, the amount of the vulcanization accelerator exuded from the side rubber can be further reduced. The deterioration of the resin material can be further suppressed, and the high-speed durability of the tire can be further improved.

<Reinforcing layer>
A reinforcement layer consists of a reinforcement member and the coating layer coat | covered with the resin composition containing 50-100 mass% of resin materials. The reinforcing layer may be used in combination with other reinforcing members, for example, a two-layer cross belt member or the like, but is preferably used alone from the viewpoint of weight reduction.
In addition, a reinforcement layer is producible by coat | covering a reinforcement member with a resin composition and arrange | positioning the reinforcement member coat | covered with the resin composition on the tire radial direction outer side of a tire frame body, for example.

  Examples of the reinforcing member used for the reinforcing layer include a steel cord, an organic fiber cord, a carbon fiber cord, and the like. Among these, a steel cord is preferable in that it has an excellent effect of improving the circumferential rigidity of the tire.

(Resin composition)
A resin composition containing 50 to 100% by mass of a resin material is used for the coating layer of the reinforcing layer. In the resin composition used for the reinforcing layer, if the content ratio of the resin material is 50% by mass or more, the effect of reducing the weight of the tire is increased, and the tire is easily recycled. When the reinforcing member is covered with rubber, it is difficult to separate the reinforcing member and rubber only by heating. However, if the coating layer is made of a resin composition containing 50 to 100% by mass of a resin material, only heating is required. The reinforcing member and the coating layer can be separated, which is advantageous in recycling the tire. Here, from the viewpoint of ease of recycling, the resin composition used for the coating layer of the reinforcing layer preferably contains 60 to 100% by mass of the resin material, and more preferably 70 to 100% by mass. Moreover, if it is a coating layer using the resin composition containing 50-100 mass% of resin materials, a reinforcement member can be hardened and the high-speed durability of a tire can be improved more.
The reinforcing layer of the tire of the present invention is different from a carcass layer formed by coating a reinforcing member with a resin composition containing 50 to 100% by mass of a resin material and covering the reinforcing member with rubber.
Here, the resin material does not include rubber, and examples of the resin material include thermoplastic resins, thermoplastic elastomers, and thermosetting resins.

The resin composition used for the reinforcing layer preferably contains at least one of a thermoplastic resin and a thermoplastic elastomer, and more preferably contains a thermoplastic elastomer. By forming the reinforcing layer using a thermoplastic resin and / or a thermoplastic elastomer, it becomes easier to recycle the reinforcing layer. Moreover, durability with respect to the strain input of a reinforcement layer improves by forming a reinforcement layer using a thermoplastic elastomer.
Here, the thermoplastic resin and the thermoplastic elastomer are high molecular compounds that soften and flow as the temperature rises, and become relatively hard and strong when cooled. In this specification, as the temperature rises, When the material softens, flows, and cools, it becomes a relatively hard and strong state, and a high-molecular compound having rubber-like elasticity becomes a thermoplastic elastomer. The material softens and flows as the temperature rises, and when cooled, it becomes relatively hard and strong. A high molecular compound that is in a certain state and does not have rubbery elasticity is distinguished as a thermoplastic resin.

[Thermoplastic resin]
Examples of the thermoplastic resin include polyolefin-based thermoplastic resins, polystyrene-based thermoplastic resins, polyamide-based thermoplastic resins, polyester-based thermoplastic resins, polyurethane-based thermoplastic resins, and the like.
From the viewpoint of facilitating recycling of the reinforcing layer, at least one of the thermoplastic resin and the thermoplastic elastomer contained in the resin composition is preferably a polyamide, polyester, polyolefin, or polyurethane. That is, in the thermoplastic resin, a polyamide-based thermoplastic resin, a polyester-based thermoplastic resin, a polyolefin-based thermoplastic resin, or a polyurethane-based thermoplastic resin is preferable.
Among these, from the viewpoint of durability against strain input, polyamide-based thermoplastic resins, polyester-based thermoplastic resins, and polyurethane-based thermoplastic resins are preferable.

[Thermoplastic elastomer]
As thermoplastic elastomers, polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), polyester-based thermoplastic elastomer (TPC) And dynamic crosslinkable thermoplastic elastomer (TPV).
As described above, from the viewpoint of facilitating recycling of the reinforcing layer, at least one of the thermoplastic resin and the thermoplastic elastomer contained in the resin composition may be polyamide, polyester, polyolefin, or polyurethane. preferable. That is, in the thermoplastic elastomer, polyamide-based thermoplastic elastomer (TPA), polyester-based thermoplastic elastomer (TPS), polyolefin-based thermoplastic elastomer (TPO), or polyurethane-based thermoplastic elastomer (TPU) is preferable.
Among these, polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), and polyester-based thermoplastic elastomer (TPC) are preferable from the viewpoint of durability against strain input.

  The thermoplastic resin and the thermoplastic elastomer may be used alone or in a combination of two or more. Further, the melting point (or softening point) of the resin material itself is usually 100 ° C. to 350 ° C., preferably about 100 ° C. to 250 ° C., but 120 ° C. to 250 ° C. from the viewpoint of compatibility between tire productivity and durability. C. is preferably about 120.degree. C. to 200.degree. By using a material having a melting point (or softening point) within the above temperature range, suitable productivity can be ensured.

(Polyamide thermoplastic elastomer)
The polyamide-based thermoplastic elastomer (TPA) is a polymer compound having elasticity, a polymer that forms a crystalline hard segment with a high melting point, and a polymer that forms an amorphous soft segment with a low glass transition temperature, It means a thermoplastic resin material made of a copolymer having a amide bond (—CONH—) in the main chain of the polymer constituting the hard segment.
As polyamide-based thermoplastic elastomers, at least polyamide is a crystalline hard segment with a high melting point, and other polymers (eg polyester, polyether, etc.) are amorphous and have a soft glass transition temperature low segment. Materials. Further, in the polyamide-based thermoplastic elastomer, a chain extender such as dicarboxylic acid may be used in addition to the hard segment and the soft segment.

Examples of the polyamide forming the hard segment of the polyamide-based thermoplastic elastomer (TPA) include a polycondensate of ω-aminocarboxylic acid and lactam, and a co-condensation polymer of diamine and dicarboxylic acid.
Examples of the ω-aminocarboxylic acid include 6-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 10-aminocapric acid, 11-aminoundecanoic acid, 12-aminododecanoic acid and the like.
Examples of the lactam include lauryl lactam, ε-caprolactam, ω-enantolactam, 2-pyrrolidone and the like.
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-trimethyl. Hexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, 3-methylpentamethylenediamine, metaxylenediamine and the like can be mentioned.
Examples of the dicarboxylic acid include oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid and the like.

  Moreover, as a polymer which forms the soft segment of a polyamide-type thermoplastic elastomer (TPA), polyether, such as polyester, polyethyleneglycol, polypropylene glycol, polytetramethylene ether glycol, ABA type | mold triblock polyether, is mentioned.

  The combination of the hard segment and the soft segment of the polyamide-based thermoplastic elastomer (TPA) includes a lauryl lactam ring-opening polycondensate / polyethylene glycol combination, a lauryl lactam ring-opening polycondensate / polypropylene glycol combination, and lauryl lactam. A ring-opening polycondensate / polytetramethylene ether glycol combination, a lauryl lactam ring-opening polycondensate / ABA type triblock polyether combination, and a lauryl lactam ring opening polycondensate / ABA type triblock poly are preferable. A combination of ethers is particularly preferred.

  The polyamide-based thermoplastic elastomer can be synthesized by copolymerizing a polymer forming a hard segment and a polymer forming a soft segment by a known method. Moreover, as a polyamide-type thermoplastic elastomer, a commercial item can be utilized, for example, "UBESTA XPA" series (For example, XPA9063X1, XPA9055X1, XPA9048X2, XPA9040X1, XPA9040X2, XPA9040X2, XPA9044, etc.) manufactured by Ube Industries, Ltd. “Vestamide” series (for example, E40-S3, E47-S1, E47-S3, E55-S1, E55-S3, EX9200, E50-R2) manufactured by Daicel Eponic Corporation.

(Polyolefin thermoplastic elastomer)
Polyolefin thermoplastic elastomer (TPO) is a hard segment with at least polyolefin crystalline and high melting point, and other polymer (for example, polyolefin or other polyolefin) is amorphous and has soft segment with low glass transition temperature. The material which comprises is mentioned. Examples of the polyolefin forming the hard segment include polyethylene, polypropylene, isotactic polypropylene, polybutene, and the like.

The polyolefin-based thermoplastic elastomer is not particularly limited. However, a crystalline polyolefin 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.
Examples of polyolefin-based thermoplastic elastomers include olefin-α-olefin random copolymers, olefin block copolymers, and the like, for example, propylene block copolymers, ethylene-propylene copolymers, propylene-1-hexene copolymers. Polymer, propylene-4-methyl-1-pentene copolymer, propylene-1-butene copolymer, 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, Examples include a propylene-methyl acrylate copolymer, a propylene-ethyl acrylate copolymer, a propylene-butyl acrylate copolymer, an ethylene-vinyl acetate copolymer, and a propylene-vinyl acetate copolymer.

Examples of polyolefin-based thermoplastic elastomers include propylene block copolymers, ethylene-propylene copolymers, propylene-1-hexene copolymers, propylene-4-methyl-1-pentene copolymers, and propylene-1-butene copolymers. , Ethylene-1-hexene copolymer, ethylene-4-methyl-pentene copolymer, ethylene-1-butene copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-methacrylic acid Ethyl acid copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene-methacrylic acid Methyl acid copolymer, propylene-meta Ethyl laurate copolymer, propylene-butyl methacrylate copolymer, propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, propylene- Vinyl acetate copolymers are preferred, ethylene-propylene copolymers, propylene-1-butene copolymers, ethylene-1-butene copolymers, ethylene-methyl methacrylate copolymers, ethylene-methyl acrylate copolymers, More preferred are ethylene-ethyl acrylate copolymers and ethylene-butyl acrylate copolymers.
Moreover, you may use combining 2 or more types of polyolefin resin like ethylene and propylene. The polyolefin content in the polyolefin-based thermoplastic elastomer is preferably 50% by mass or more and 100% by mass or less.

  The number average molecular weight of the polyolefin-based thermoplastic elastomer is preferably 5,000 to 10,000,000. When the number average molecular weight of the polyolefin-based thermoplastic elastomer is in the range of 5,000 to 10,000,000, the mechanical properties of the resin material are sufficient and the processability is also excellent. From the same viewpoint, it is more preferably 7,000 to 1,000,000, and particularly preferably 10,000 to 1,000,000. Thereby, the mechanical properties and processability of the resin material can be further improved. 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 (x: y) of the hard segment (x) and the soft segment (y) is preferably 50:50 to 95: 5, and more preferably 50:50 to 90:10, from the viewpoint of moldability.

The polyolefin-based thermoplastic elastomer can be synthesized by copolymerizing a polymer forming a hard segment and a polymer forming a soft segment by a known method.
Also, commercially available polyolefin-based thermoplastic elastomers can be used, such as “Tuffmer” series manufactured by Mitsui Chemicals, “Nucleel” series, “Elvalloy AC” series, Mitsui-DuPont Polychemical Co., Ltd., Sumitomo Chemical "ACRlift" series, "Evertate" series, Tosoh Corporation "Ultrasen" series, "Prime TPO" series made by Prime Polymer, etc. can be used.

(Polyurethane thermoplastic elastomer)
As polyurethane-based thermoplastic elastomer (TPU), at least polyurethane forms pseudo-crosslinks by physical agglomeration to form hard segments, and other polymers form amorphous and low glass transition temperature soft segments. Material.

  Polyurethane thermoplastic elastomer (TPU) soft segments include polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, poly (butylene absibate) diol, poly-ε-caprolactone diol, poly (hexamethylene carbonate) diol, etc. Polymer diol compound, 1,2-ethylene diisocyanate, 1,3-propylene diisocyanate, 1,4-butane diisocyanate, 1,6-hexamethylene diisocyanate, 1,4-cyclohexane diisocyanate, 4,4-cyclohexane diisocyanate, 4 , 4′-diphenylmethane diisocyanate, tolylene diisocyanate and other diisocyanate compounds can be used.

  In addition, the hard segment of the polyurethane-based thermoplastic elastomer (TPU) includes 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, 1,10-decanediol, cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane -1,3-diol, cyclohexane-1,4-diol, cyclohexane-1,4-dimethanol, hydroquinone, resorcin, chlorohydroquinone, bromohydroquinone, methylhydroquinone, phenylhydroquinone, methoxyhydroquinone, phenoxyhydroquino 4,4′-dihydroxybiphenyl, 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxydiphenyl sulfide, 4,4′-dihydroxydiphenyl sulfone, 4,4′-dihydroxybenzophenone, 4,4′-dihydroxydiphenylmethane Low molecular diol compounds such as bisphenol A, 1,1-di (4-hydroxyphenyl) cyclohexane, 1,2-bis (4-hydroxyphenoxy) ethane, 1,4-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, and the like 1,2-ethylene diisocyanate, 1,3-propylene diisocyanate, 1,4-butane diisocyanate, 1,6-hexamethylene diisocyanate, 1,4-cyclohexane diisocyanate, 4,4-cyclohexane diisocyanate Sulfonate, 4,4'-diphenylmethane diisocyanate, and a diisocyanate compound such as tolylene diisocyanate, may be used.

  The polyurethane-based thermoplastic elastomer can be synthesized by copolymerizing a polymer forming a hard segment and a polymer forming a soft segment by a known method. In addition, as the polyurethane-based thermoplastic elastomer, commercially available products can be used. "U" series (for example, 2000 series, 3000 series, 8000 series, 9000 series), "Milactolan" series (for example, XN-2001, XN-2004, P390RSUP, P480RSUI, P26MRNAT, E490, E590, manufactured by Japan Miractolan Co., Ltd. P890).

(Polyester thermoplastic elastomer)
A polyester-based thermoplastic elastomer (TPC) is a polymer compound having elasticity, a polymer that forms a crystalline hard segment with a high melting point, and a polymer that forms an amorphous soft segment with a low glass transition temperature, And a polyester resin as a polymer constituting the hard segment.

An aromatic polyester can be used as the crystalline polyester forming the hard segment of the polyester-based thermoplastic elastomer (TPC). 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 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 Acid component, ethylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentyl glycol, decamethylene glycol, 1,4-cyclohexanedimethanol, 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, Polyesters derived from diol components such as 1-bis [4- (2-hydroxyethoxy) phenyl] cyclohexane, 4,4′-dihydroxy-p-terphenyl, and 4,4′-dihydroxy-p-quaterphenyl Alternatively, it may be a copolyester in which two or more of these dicarboxylic acid components and diol components are used in combination.

Examples of the polymer forming the soft segment of the polyester-based thermoplastic elastomer (TPC) include polymers selected from aliphatic polyethers and aliphatic polyesters.
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 addition polymer, and poly (ε-caprolactone) from the viewpoint of the elastic properties of the resulting copolymer ), Polybutylene adipate, polyethylene adipate and the like are preferred.

  The polyester-based thermoplastic elastomer can be synthesized by copolymerizing a polymer forming a hard segment and a polymer forming a soft segment by a known method. Moreover, as a polyester-type thermoplastic elastomer, a commercial item can be utilized, for example, "Hytrel" series (for example, 3046, 5557, 5577, 6347, 4047, 4767, 4777, etc.) manufactured by Toray DuPont Co., Ltd. And “BELPLEN” series (P30B, P40B, P40H, P55B, P70B, P150B, P280B, P450B, P150M, S1001, S2001, S5001, S6001, S9001, etc.) manufactured by Toyobo Co., Ltd., and the like.

[Thermosetting resin]
Moreover, as a thermosetting resin, a phenol resin, an epoxy resin, a melamine resin, a urea resin, etc. are mentioned.

  In addition to resin materials, resin compositions include rubber, various fillers (for example, silica, calcium carbonate, clay), anti-aging agents, oils, plasticizers, colorants, weathering agents, reinforcing materials as desired. You may contain additives, such as.

  In order to further improve the adhesion performance between the covering layer of the reinforcing layer and the reinforcing member, an adhesive layer may be provided between the covering layer and the reinforcing member, and the covering layer is formed by stacking a plurality of different materials. It may be what you did. Here, for the adhesive layer, for example, a thermoplastic resin or a thermoplastic elastomer, a solvent-based adhesive, a water-based adhesive, a thermosetting resin, or the like can be used.

<Tire frame>
As described with reference to FIG. 1, the tire frame (tire case) is formed of a resin composition that is annular and contains 50 to 100% by mass of a resin material.
The resin composition used for the tire frame body may be the same as or different from the resin composition used for the coating layer of the reinforcing layer, but is the same in consideration of differences in adhesion and physical properties between the coating layer and the tire frame body. It is preferable.
The thickness of the tire frame at the maximum tire width when no load is applied is usually 0.5 to 2.5 mm, preferably 1 to 2 mm. The tire frame is formed on the tire inner surface of a tire case mainly made of rubber. This is different from the inner liner made of resin having a thickness of usually 100 μm or less.

  In the resin composition that can be used for the tire skeleton, if the content ratio of the resin material is 50% by mass or more, the tire can be easily recycled. Here, from the viewpoint of ease of recycling, the resin composition that can be used for the tire skeleton preferably includes 90 to 100% by mass of a resin material.

  It is preferable that the resin composition that can be used for the tire frame includes at least one of a thermoplastic resin and a thermoplastic elastomer. By forming a tire frame using a thermoplastic resin and / or thermoplastic elastomer, it becomes easier to recycle. In addition, the structure can be simplified and the weight of the tire can be further reduced compared to conventional rubber tires. can do.

As the resin composition that can be used for the tire frame, the thermoplastic resin and the thermoplastic elastomer described as the resin composition used for the coating layer of the reinforcing layer can be used.
Similarly, from the viewpoint of facilitating recycling of the tire skeleton, at least one of the thermoplastic resin and the thermoplastic elastomer contained in the resin composition is preferably polyamide, polyester, polyolefin or polyurethane. . That is, in the thermoplastic resin, a polyamide-based thermoplastic resin, a polyester-based thermoplastic resin, a polyolefin-based thermoplastic resin, or a polyurethane-based thermoplastic resin is preferable. Of the thermoplastic elastomers, polyamide-based thermoplastic elastomers (TPA), polyester-based thermoplastic elastomers (TPS), polyolefin-based thermoplastic elastomers (TPO), or polyurethane-based thermoplastic elastomers (TPU) are preferable.
Furthermore, from the viewpoint of durability against strain input, polyamide-based thermoplastic resin, polyester-based thermoplastic resin, polyurethane-based thermoplastic resin, polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), and polyester-based It is preferable to use at least one selected from the group consisting of thermoplastic elastomers (TPC).
The additives that can be added in addition to the resin material are the same as those of the resin composition used for the covering layer of the reinforcing layer.

  The tire skeleton using the resin composition can be manufactured according to the second embodiment of Japanese Patent Application Laid-Open No. 2012-046030 (Patent Document 1). For example, a half of the tire skeleton is manufactured by injection molding. The halves can be manufactured by facing each other and bonded, and it is preferable to press at a temperature equal to or higher than the melting point of the resin material in the resin composition used.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

[Examples 1 to 15 and Comparative Examples 1 to 8]
According to the second embodiment of JP 2012-046030 A (Patent Document 1), a polyamide-based thermoplastic elastomer (polyamide-based thermoplastic elastomer, Ube Industries, Ltd., trade name “UBESTA XPA9055X1”) is used as a resin material. Tire halves are produced by injection molding, the halves face each other, and pressed and joined at a temperature equal to or higher than the melting point of the polyamide-based thermoplastic elastomer used to produce a tire skeleton (tire case). did.
Next, a steel cord covered with a polyamide-based thermoplastic elastomer was spirally wound in the circumferential direction of the tire on the outer side in the tire radial direction of the tire skeleton to dispose a reinforcing layer. In addition, a carcass layer formed by coating a polyester organic fiber cord with a rubber composition for carcass ply coating rubber prepared by a conventional method was disposed so that the organic fiber cords were arranged in the tire radial direction.
Further, a rubber surface layer composed of a rubber composition for side rubber having a formulation shown in Tables 1 to 2, a rubber composition for tread rubber prepared by a conventional method, and a rubber composition for gum chafer is used as a reinforcing layer. After disposing on the outer side in the tire radial direction, it was vulcanized to produce a tire (pneumatic tire).

In addition, the thickness in the tire maximum width part at the time of no load of the produced tire frame body was 2 mm.
In addition, the tire frame body of the manufactured tire and the coating layer of the steel cord are made of a polyamide-based thermoplastic elastomer, and the ratio of the resin material is 100% by mass.

Further, the amount of organic acid in the rubber composition for side rubber and the side rubbers tan δ and E ′ were measured by the following methods.
Furthermore, high-speed durability (high-speed drum durability) was evaluated by the following method with respect to the obtained tire.

(1) Measurement of amount of organic acid in rubber composition for side rubber The amount of organic acid in the rubber composition for side rubber was determined according to JIS K6237: 2012. The results are shown in the “Organic acid” column of the “Formulation” column of Tables 1 and 2.

(2) Measurement of tan δ and E ′ Using the rubber composition used for the side rubber, a rubber sheet having a length of 50 mm, a width of 5 mm, and a thickness of 2 mm was cut out from the rubber obtained under the same vulcanization conditions as the prepared tire. Using a dynamic viscoelasticity measuring device manufactured by Kamishima Seisakusho, under a condition of an initial load of 160 mg and a frequency of 52 Hz, a loss tangent tanδ at a dynamic strain of 1% at 25 ° C. and a storage elastic modulus E ′ under the same conditions are measured. did. The results are shown in the “tan δ” column and the “E ′” column of Tables 1 and 2.

(3) Durability of high-speed drum Each test tire was adjusted to an internal pressure of 300 kPa in a room at 25 ° C ± 2 ° C and left for 24 hours. Then, on a drum having a diameter of about 3 m, the speed was increased by 10 km every 10 minutes at a speed of 100 km / h. The distance when the tire broke down was regarded as the durability distance, and the value of Example 1 was indexed as 100, and the high speed durability of the tire was evaluated from the magnitude of the index value according to the following evaluation criteria.
(Evaluation criteria)
◎: Index is 100 or more ○: Index is 95 or more and less than 100 Δ: Index is 90 or more and less than 95 ×: Index is less than 90

(4) Side cut resistance Each tire is mounted on a specified rim, the air pressure is 220 kPa, a load of 3.00 kPa is applied, the tire is rolled, and the side rubber has a curvature radius R = 10 (mm) at the tip. A certain convex protrusion was pressed, and it was investigated whether or not the side rubber was cut depending on whether or not air leakage occurred. If no air leak occurred, the test was repeated until the load on the tire was increased and a side cut occurred. The number of times until the side cut occurs was indexed with the value of Example 1 being 100, and the side cut resistance of the tire was evaluated according to the following evaluation criteria from the magnitude of the index value.
(Evaluation criteria)
◎: Index is 100 or more ○: Index is 95 or more and less than 100 Δ: Index is 90 or more and less than 95 ×: Index is less than 90

Details of the ingredients in Tables 1 and 2 are as follows.
[Rubber component]
NR: Natural rubber, made in Indonesia, trade name “SIR20”
BR: Butadiene rubber, manufactured by JSR Corporation, trade name “BR01”
IIR: Butyl rubber, manufactured by JSR Corporation, trade name “2255”

〔Carbon black〕
CB ISAF: Asahi Carbon Co., Ltd., trade name “# 80 (ISAF)”
CB HAF: Asahi Carbon Co., Ltd., trade name “# 70 (HAF)”
CB GPF: Asahi Carbon Co., Ltd., trade name “# 55 (GPF)”

[Various ingredients]
Organic acid: Stearic acid vulcanization accelerator: N- (1,3-dimethylbutyl) -N′-phenyl-p-phenylenediamine, manufactured by Ouchi Shinsei Chemical Co., Ltd., trade name “NOCRACK 6C”
The organic acid uses stearic acid as a compounding component, and the amount in the “organic acid” column in the table indicates the total amount of organic acid in the rubber composition for side rubber including the amount of organic acid contained in natural rubber and the like. Represent.

  From Table 1 to Table 2, a rubber surface layer including a side rubber satisfying the tread rubber and the formula (1), in which the covering layer of the reinforcing member of the reinforcing layer and the tire skeleton are made of a resin composition (resin material 100% by mass). It turns out that the tire of the example which has has the outstanding high-speed durability and side cut resistance.

  According to the present invention, it is possible to provide a tire excellent in high-speed durability and side cut resistance while using a resin material.

DESCRIPTION OF SYMBOLS 10 Tire frame body 11 Bead part 12 Side part 13 Crown part 14 Bead core 20 Reinforcement layer 21 Reinforcement member 22 Cover layer 30 Rubber surface layer 32 Tread rubber 34 Side rubber 36 Gum chafer 40 Carcass layer

Claims (7)

An annular tire frame made of a resin composition containing 50 to 100% by mass of a resin material;
A reinforcing layer provided on the outer side in the tire radial direction of the tire skeleton,
A rubber surface layer provided on the outer side of the reinforcing layer in the tire radial direction and including at least a tread rubber and a side rubber;
With
The reinforcing layer is a resin composition containing a resin material in an amount of 50 to 100% by mass, and covers the reinforcing member.
The side rubber has a loss tangent tanδ at an initial load of 160 mg, a frequency of 52 Hz, and a dynamic strain of 1% at 25 ° C., and an initial load of 160 mg, a storage elastic modulus E ′ at a frequency of 52 Hz and a dynamic strain of 1% at 25 ° C. of the following formula (1 Tires satisfying).
0.009x + 0.0254 <y <0.009x + 0.27 (1)
[In the formula (1), x represents the storage elastic modulus E ′ at an initial load of 160 mg, frequency of 52 Hz, and dynamic strain of 1% at 25 ° C., y represents the initial load of 160 mg, frequency of 52 Hz, and dynamic strain of 1% at 25 ° C. Represents the loss tangent tan δ. ]   2. The tire according to claim 1, wherein a loss tangent tan δ at an initial load of 160 mg, a frequency of 52 Hz, and a dynamic strain of 1% at 25 ° C. is less than 0.17.   The said side rubber consists of a rubber composition for side rubbers, and this rubber composition for side rubbers contains 0.1-5.5 mass parts organic acid with respect to 100 mass parts of said rubber components. Tire described in.   The said side rubber consists of a rubber composition for side rubbers, and this rubber composition for side rubbers contains 0.1-5.5 mass parts vulcanization accelerator with respect to 100 mass parts of said rubber components. Item 4. The tire according to any one of Items 3.   The tire according to any one of claims 1 to 4, wherein the reinforcing member is wound in a tire circumferential direction.   The resin composition used for the said reinforcement layer and at least one of the resin composition used for the said tire frame | skeleton body contain at least one of a thermoplastic resin and a thermoplastic elastomer, The any one of Claims 1-5. tire.   The tire according to claim 6, wherein at least one of the thermoplastic resin and the thermoplastic elastomer is a polyamide, polyester, polyolefin, or polyurethane system.