JP2016128298A - Tire tread and tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire tread and a tire having improved grip performance.SOLUTION: A tire tread comprises a resin material, and a rubber material dispersed in the resin material, where the content of the rubber material is 5 pts.mass to 50 pts.mass relative to the resin material 100 pts.mass.SELECTED DRAWING: None

Description

  The present invention relates to a tire tread and a tire.

  Conventionally, in a tire tread whose main material is rubber such as natural rubber, additives are often added to the tire tread in order to enhance various performances. The tire having such a tire tread includes, for example, 2-50 parts by mass of ultrafine powder rubber having an average particle size of 10 nm to 500 nm with respect to 100 parts by mass of natural rubber and / or diene synthetic rubber. A pneumatic tire characterized by using a rubber composition in a tread portion has been proposed (see, for example, Patent Document 1).

JP 2006-089552 A

  In addition, development of a resin tire tread whose main material is resin instead of a tire tread whose main material is rubber has been studied. Since the resin tire tread enables tire production by injection molding or the like, improvement in production efficiency is expected. However, it is difficult to improve the grip performance of the resin tire tread as compared with the rubber tread, and development of a technique for improving the grip performance of the resin tire tread is desired.

  An object of the present invention is to provide a tire tread and a tire with improved dry grip performance in consideration of the above facts.

[1] A tire tread that includes a resin material and a rubber material dispersed in the resin material, and the content of the rubber material is 5 parts by mass to 50 parts by mass with respect to 100 parts by mass of the resin material.
[2] The tire tread according to [1], wherein a content of the rubber material is 10 to 30 parts by mass with respect to 100 parts by mass of the resin material.
[3] The tire tread according to [1] or [2], wherein the resin material includes a thermoplastic resin elastomer.
[4] The tire tread according to [3], wherein the thermoplastic resin elastomer is a polyolefin-based thermoplastic resin elastomer or a polyamide-based thermoplastic resin elastomer.
[5] The tire tread according to any one of [1] to [4], further including an adhesive.
[6] The tire tread according to any one of [1] to [5], which is formed by injection molding.
[7] A tire comprising the tire tread according to any one of [1] to [6] and a tire skeleton.

  According to the present invention, it is possible to provide a tire tread and a tire with improved dry grip performance.

(A) is a perspective view showing a section of a part of the tire concerning a 1st embodiment, and (B) is a sectional view of a bead part with which a rim was equipped. 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.

<Tire tread>
The tire tread of the present invention includes a resin material and a rubber material dispersed in the resin material, and the content of the rubber material is 5 to 50 parts by mass with respect to 100 parts by mass of the resin material.

The tire tread of the present invention has a configuration in which a specific amount of rubber material is dispersed and contained in a resin material. Since the tire tread of the present invention has such a configuration, the rubber material exposed on the surface of the tire tread at the time of traveling bites into the road surface, and the dry grip performance is improved as compared with a tire tread simply made using a resin. It is guessed. Hereinafter, the resin tire tread may be simply referred to as “resin tread”.
In addition, when a rubber material smaller than the elastic modulus of the resin material is used, the presence of a specific amount of the rubber material dispersed in the resin material improves the flexibility of the entire tire tread and makes contact with the road surface. It is assumed that the dry grip performance is improved.

  The tire tread of the present invention can be formed by injection molding. In particular, when a thermoplastic resin elastomer is used as the material constituting the tire frame body, the tire tread can be easily formed together with the tire frame body by injection molding, and the production efficiency is excellent. Furthermore, the tire tread of the present invention can be attached to the tire frame body without using an adhesive layer by using a resin for the tire frame body. For this reason, in the manufacturing process of the tire of this invention, the process of apply | coating an adhesive layer can also be skipped and it is excellent in production efficiency.

  In the present specification, “resin” is a concept including a thermoplastic resin and a thermosetting resin, but does not include vulcanized rubber such as natural rubber and synthetic rubber. In addition, “rubber” is a concept including a polymer compound having elasticity, but is distinguished from a thermoplastic resin elastomer in this specification. “Thermoplastic resin elastomer” is a polymer compound having elasticity, a crystalline polymer having a high melting point or a hard segment having a high cohesive force, and an amorphous glass transition temperature. It means a thermoplastic resin material comprising a copolymer having a polymer constituting a low soft segment. In the thermoplastic resin elastomer, the hard segment behaves as a pseudo crosslinking point and develops elasticity (so-called physical crosslinking). On the other hand, rubber has a double bond in the molecular chain, and is crosslinked (vulcanized) by adding sulfur or the like to generate a three-dimensional network structure and develop elasticity (chemical crosslinking). . Therefore, the thermoplastic resin elastomer can be reused because the hard segment is melted by heating and a pseudo crosslinking point is formed again by cooling.

[Resin material]
The tire tread of the present invention includes a resin material. From the viewpoint of compatibility with the rubber material and injection moldability, the resin material preferably contains a thermoplastic resin elastomer. As the thermoplastic resin elastomer, for example, a polyolefin-based thermoplastic resin elastomer, a polyamide-based thermoplastic resin elastomer, a polyurethane-based thermoplastic resin elastomer, or a polyester-based thermoplastic resin elastomer can be used. From the viewpoint of compatibility with the rubber material, it is preferable to use a polyolefin-based thermoplastic resin or a polyamide-based thermoplastic resin elastomer. The said thermoplastic resin elastomer may be used individually by 1 type, and may be used in combination of 2 or more type as appropriate.
The content of the resin material in the tire tread is preferably 65% by mass to 95% by mass, more preferably 75% by mass to 95% by mass, from the viewpoint of the elastic modulus and strength of the tire tread. It is especially preferable that it is mass%-95 mass%.

-Polyolefin thermoplastic elastomer-
The polyolefin-based thermoplastic resin elastomer comprises a hard segment having a high melting point and at least a polyolefin is crystalline, and other polymers (for example, the polyolefin, other polyolefins, and polyvinyl compounds) are amorphous and have a low glass transition temperature. It means a material constituting a soft segment, and examples thereof include a polyolefin-based thermoplastic elastomer (TPO) defined in JIS K6418: 2007.

  Examples of the polyolefin forming the hard segment include polyethylene, polypropylene, isotactic polypropylene, polybutene, and the like. Examples of the soft segment of the polyolefin-based thermoplastic resin elastomer include polyolefins and polyvinyl compounds. For example, rubber-like copolymers (EPM) of ethylene and propylene and rubber-like materials of ethylene, propylene and diene compounds. An ethylene propylene rubber such as a copolymer (EPDM) may be used as the soft segment.

Examples of the polyolefin-based thermoplastic resin elastomer include olefin-α-olefin random copolymers, olefin block copolymers, and the like. For example, propylene block copolymers, ethylene-propylene copolymers, 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, 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.
The polyolefin content in the polyolefin-based thermoplastic resin elastomer is preferably 50% by mass or more and 100% by mass or less.

  The polyolefin-based thermoplastic resin elastomer is preferably a homopolymer of polypropylene or polyethylene, or a copolymer of polypropylene and polyethylene (ethylene-propylene copolymer). Examples of the copolymer of polypropylene and polyethylene include a random copolymer or a block copolymer.

The number average molecular weight of the polyolefin-based thermoplastic resin elastomer is preferably 5,000 to 10,000,000. When the number average molecular weight of the polyolefin-based thermoplastic resin elastomer is 5,000 to 10,000,000, the mechanical properties of the tire tread are sufficient, and the workability when producing the tire tread is also excellent. From the same viewpoint, the number average molecular weight of the polyolefin-based thermoplastic resin elastomer 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 thermoplastic resin material can be further improved.
From the viewpoint of moldability, the mass ratio (x: y) of the hard segment (x) and the soft segment (y) in the polyolefin-based thermoplastic resin elastomer is preferably 50:50 to 95: 5, and 50:50. ~ 90: 10 is more preferred.

  The polyolefin-based thermoplastic resin elastomer can be synthesized by copolymerization by a known method.

Examples of the polyolefin-based thermoplastic elastomer include, for example, a commercially available “INFUSE” series (for example, 9507) manufactured by Dow Corning and a “Toughmer” series (for example, A0550S, A1050S, A4050S, A1070S, A4070S) manufactured by Mitsui Chemicals. , A35070S, A1085S, A4085S, A7090, A70008, MH7007, MH7010, XM-7070, XM-7080, BL4000, BL2481, BL3110, BL3450, P-0275, P-0375, P-0775, P-0180, P-0280 , P-0480, P-0680), Mitsui DuPont Polychemical Co., Ltd. “Nuclele” series (for example, AN4214C, AN4225C, AN42115C, N0903HC, N 908C, AN42012C, N410, N1050H, N1108C, N1110H, N1207C, N1214, AN4221C, N1525, N1560, N0200H, AN4228C, AN4213C, N035C, “Elvalloy AC” series (for example, 1125AC, 1209AC, 1218AC, 1609AC, 1820 2112AC, 2116AC, 2615AC, 2715AC, 3117AC, 3427AC, 3717AC), Sumitomo Chemical Co., Ltd. “ACRIFT” series, “Evertate” series, Tosoh Corporation “Ultrasen” series, and the like.
Furthermore, examples of the polyolefin-based thermoplastic resin elastomer include, for example, “Prime TPO” series (for example, E-2900H, F-3900H, E-2900, F-3900, J-manufactured by Prime Polymer Co., Ltd.). 5710, J-5900, E-2910, F-3910, J-5910, E-2710, F-3710, J-5910, E-2740, F-3740, R110MP, R110E, T310E, M142E, etc.) are also used. be able to.

-Acid modification of polyolefin-based thermoplastic resin elastomers-
As said polyolefin-type thermoplastic resin elastomer, the polyolefin-type thermoplastic resin elastomer (acid modified polyolefin-type thermoplastic resin elastomer) which has an acidic group can also be used, for example.

Examples of the acid group possessed by the acid-modified polyolefin-based thermoplastic resin elastomer include a carboxylic acid group, a sulfuric acid group, and a phosphoric acid group, which are weak acid groups, from the viewpoint of suppressing deterioration of the thermoplastic resin material. Is particularly preferred.
Here, “acid-modified” refers to bonding an unsaturated compound having an acidic group such as a carboxylic acid group, a sulfuric acid group, or a phosphoric acid group to an olefinic thermoplastic resin elastomer. For example, when an unsaturated carboxylic acid (generally maleic anhydride) is used as an unsaturated compound having an acidic group, an unsaturated bond site of the unsaturated carboxylic acid is bonded to the olefinic thermoplastic elastomer (for example, , Graft polymerization).

In general, acid modification of a polyolefin-based thermoplastic resin elastomer is performed using a twin screw extruder or the like, and an olefin-based thermoplastic resin elastomer, an unsaturated compound having an acidic group (for example, an unsaturated carboxylic acid), and an organic peroxide. It can be carried out by kneading and graft copolymerization. The addition amount of the unsaturated compound having an acidic group is preferably 0.1 part by mass to 20 parts by mass, and more preferably 0.5 part by mass to 10 parts by mass with respect to 100 parts by mass of the olefinic thermoplastic resin elastomer. .
If the amount of the unsaturated compound having an acidic group is too small, the amount of grafting to the olefinic thermoplastic resin elastomer is lowered. On the other hand, if the amount added is excessive, the amount of unreacted unsaturated carboxylic acid in the resin increases, and sufficient adhesive strength cannot be obtained, resulting in poor workability.
The organic peroxide may be added in an amount sufficient to carry out the grafting reaction. For example, 0.01 to 5 parts by weight is preferable, and 0.03 to 1 part by weight is further added. preferable.
Examples of the organic peroxide include 1,1-bis (t-butylperoxy) cyclohexane, 2,2-bis (4,4-di-t-butylperoxycyclohexyl) propane, and 1,1-bis. (T-butylperoxy) cyclododecane, t-hexylperoxyisopropyl monocarbonate, t-butylperoxy-3,5,5-trimethylhexanoate, t-butylperoxylaurate, 2,5-dimethyl- 2,5-di (benzoylperoxy) hexane, t-butylperoxyacetate, 2,2-bis (t-butylperoxy) butene, t-butylperoxybenzoate, n-butyl-4,4-bis ( t-peroxy) valerate, di-t-butylperoxyisophthalate, dicumyl peroxide, α, α′-bis (t-butyl) Peroxy-m-isopropyl) benzene, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 1,3-bis (t-butylperoxydiisopropyl) benzene, t-butylcumyl peroxide, Di-t-butyl peroxide, p-menthane hydroperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, di-3-methoxybutyl peroxydicarbonate, di- 2-ethylhexylperoxydicarbonate, bis (4-t-butylcyclohexyl) peroxydicarbonate, diisopropylperoxydicarbonate, t-butylperoxyisopropylcarbonate, dimyristylperoxycarbonate, 1,1,3,3 -Tetramethylbutyl neodecanoate, α-kumi Luperoxyneodecanoate, t-butylperoxyneodecanoate and the like can be mentioned, and these may be used alone or in combination of two or more.

Examples of the acid-modified polyolefin-based thermoplastic resin elastomer include those obtained by graft-polymerizing acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc. to an olefin-based thermoplastic resin elastomer. In particular, it is preferable to use maleic anhydride.
Examples of the acid-modified polyolefin-based thermoplastic resin elastomer include, for example, commercially available “Tuffmer” series (MA8510, MH7007, MH7010, MA7020, MP0610, MP0620, etc.) manufactured by Mitsui Chemicals, Inc., “Admer” series (for example, LB548, QB510, QF500, QF551, QE060, QE840, NE065, etc.) can be used.

-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. As a polyamide which forms the said hard segment, the polyamide produced | generated by the monomer represented by the following general formula (1) or general formula (2) can be mentioned, for example.

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 copolycondensation 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 forming the hard segment, a polyamide obtained by ring-opening polycondensation of lauryl lactam, ε-caprolactam or udecan lactam can be preferably used.

Examples of the polymer that forms the soft segment include polyesters and polyethers, such as polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, ABA type triblock polyether, and the like. Or two or more can be used. Moreover, polyether diamine etc. which are obtained by making ammonia 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 above general formula (3), x and z are each preferably an integer of 1 to 18, more preferably an integer of 1 to 16, particularly preferably an integer of 1 to 14, and most preferably an integer of 1 to 12. . In the general formula (3), 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 that forms the hard segment and the polymer that forms the soft segment by a known method.

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

[Rubber material]
The tire tread of the present invention includes a rubber material. The tire tread of the present invention has a so-called sea-island structure in which a rubber material is dispersed as a dispersed phase (domain) in a matrix of a resin material forming a continuous phase. As described above, when the tire material has a sea-island structure in which the resin material forms a matrix (continuous phase) and the rubber material becomes a domain (dispersed phase) in the tire tread, the domain is dispersed and exposed on the matrix surface, It seems that dry grip performance can be improved by biting into the road surface. In addition, rubber materials that tend to be softer than resin materials are dispersed in the resin material, which improves the flexibility of the entire tire tread and improves contact with the road surface, improving dry grip performance. Seems to be able to.

  The dispersion of the rubber material in the resin material can be confirmed by photographic observation using an SEM (scanning electron microscope).

  The type of rubber material is not particularly limited. For example, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer. Examples thereof include diene rubbers such as rubber (NBR).

  The diene rubber may be a vulcanized rubber. The rubber may be vulcanized by a known method, for example, by the methods described in JP-A-11-048264, JP-A-11-029658, JP-A-2003-238744, and the like. . For rubber vulcanization, for example, a reinforcing material such as carbon black, a filler, a vulcanizing agent, a vulcanization accelerator, a fatty acid or a salt thereof, a metal oxide, a process oil, an antiaging agent, and the like are appropriately blended with the rubber. And after kneading | mixing using a Banbury mixer, it can carry out by heating.

  The rubber material may be ethylene propylene rubber. The ethylene-propylene rubber includes a rubbery copolymer (EPDM) of ethylene, propylene, and a diene compound, or a rubbery copolymer (EPM) of ethylene and propylene, and a modified product thereof (for example, maleic acid). Modified ethylene propylene rubber) is also included.

Examples of the diene compound contained in EPDM include ethylidene norbornene (ENB), 1,4 hexadiene (1,4-HD), dicyclopentadiene (DCP), and the like. Examples of the modified ethylene propylene rubber include maleic acid-modified EPDM. The maleic acid-modified EPDM can be obtained by treating EPDM with maleic anhydride.
As the ethylene propylene rubber, EPDM or a modified product thereof is preferable from the viewpoint of easily increasing the strength by vulcanization.
Although there is no limitation in particular as said ethylene propylene rubber, For example, Mitsui Chemicals Co., Ltd. commercial item "EPT X-3012P" etc. can be used.

  The number average molecular weight of the rubber is preferably 100,000 to 300,000, more preferably 120,000 to 160,000 from the viewpoint of injection moldability.

  The rubber material may be a recycled rubber obtained by physically and / or chemically treating a vulcanized rubber product. Examples of the recycled rubber include rubber particles (powder rubber) obtained by pulverizing a vulcanized rubber product, and reclaim rubber imparted with plasticity and tackiness by chemically treating the vulcanized rubber product.

  The rubber material contained in the tire tread may be used alone or in combination of two or more as appropriate. However, the rubber material included in the tire tread is preferably selected as appropriate from the viewpoint of compatibility with the above-described resin material.

The rubber material may be rubber particles themselves or a dispersion of a rubber composition.
When the rubber material is rubber particles, the average particle diameter of the rubber particles is preferably 0.01 mm to 1 mm, from 0.01 mm to 0.1 mm, from the viewpoint of improving dry grip performance and improving injection moldability. More preferably it is. The average particle size of the rubber particles can be measured with a particle size distribution meter such as a light scattering photometer “DLS-7000DL” manufactured by Otsuka Electronics Co., Ltd.
As the rubber particles, for example, commercially available products “TB30” and “TB200” manufactured by Muraoka Rubber Industry Co., Ltd. can be used.
When the rubber material is a dispersion of a rubber composition, for example, by kneading the rubber composition containing the rubber with the resin material, the rubber composition is dispersed in a continuous phase made of the resin material, can do.

  Content of the rubber material in the said tire tread is 5 mass parts-50 mass parts with respect to 100 mass parts of resin materials. Further, from the viewpoint of the elastic modulus of the tire tread, the content of the rubber material in the tire tread is preferably 10 parts by mass to 30 parts by mass with respect to 100 parts by mass of the resin material. Part is more preferable, and 15 parts by weight to 25 parts by weight is particularly preferable.

From the viewpoint of improving dry grip performance and improving wear resistance, the elastic modulus of the rubber material is preferably smaller than the elastic modulus of the resin material.
The elastic modulus in the present invention is implemented by a method according to JIS K6251: 2010, and tensile elastic modulus (20N and 40N) measured under the measurement condition of pulling a sample piece of dumbbell No. 5 size at a pulling speed of 100 mm / min. Calculated from the slope).

[Other ingredients]
The tire tread of the present invention may further contain an adhesive from the viewpoint of improving the adhesion between the resin material and the rubber material. It does not specifically limit as an adhesive agent, A well-known adhesive agent in the said technical field can be used. For example, by kneading a resin material, a rubber material, and an adhesive, the adhesive can be interposed between the resin material that is a continuous phase and the rubber material that is a dispersed phase.
Moreover, in order to improve the adhesiveness between the tire tread and other tire members, an adhesive may be applied to the tire tread surface.

For tire treads, various fillers (for example, silica, calcium carbonate, clay), anti-aging agents, vulcanizing agents, vulcanization accelerators, metal oxides, process oils, plasticizers are used depending on the materials used. Various additives such as a colorant, a weathering agent, and a reinforcing material may be contained. The content of the additive in the tire tread is not particularly limited, and can be appropriately used as long as the effects of the present invention are not impaired.
If some specific examples are mentioned among the above-mentioned various additives, as said anti-aging agent, the anti-aging agent described in international publication WO2005 / 063482 is mentioned, for example. Specifically, for example, naphthylamines such as phenyl-2-naphthylamine and phenyl-1-naphthylamine, 4,4′-bis (α, α-dimethylbenzyl) diphenylamine, p- (p-toluenesulfonylamide) diphenylamine and the like. Amine-based antioxidants such as diphenylamine, N, N′-diphenyl-p-phenylenediamine, p-phenylenediamine such as N-isopropyl-N′-phenyl-p-phenylenediamine, and derivatives or mixtures thereof. Is mentioned.
Moreover, as said vulcanizing agent, a well-known vulcanizing agent, for example, sulfur, an organic peroxide, a resin vulcanizing agent, etc. can be used. Examples of the vulcanization accelerator include known vulcanization accelerators such as aldehydes, ammonia, amines, guanidines, thioureas, thiazoles, sulfenamides, thiurams, dithiocarbamates, and xanthates. Can be used. Examples of the fatty acid include stearic acid, palmitic acid, myristic acid, lauric acid and the like, and these may be blended in a salt state like zinc stearate. Of these, stearic acid is preferred. In addition, examples of the metal oxide include zinc white (ZnO), iron oxide, magnesium oxide, and the like. Among these, zinc white is preferable. The process oil may be any of aromatic, naphthenic and paraffinic.

[Tire tread manufacturing method]
The tire tread of the present invention can be produced by kneading and molding the tread composition containing the above-described resin material and rubber material, and optionally other components. A known method can be used for kneading each material. Examples of the kneader that can be used for the kneading include a screw extruder, a kneader, a Banbury mixer, a biaxial kneading extruder, and the like. The molding method is not particularly limited, but it is preferable to use injection molding from the viewpoint of improving productivity. In the present invention, since it contains a resin material, it tends to be easily injection-molded. Moreover, when using an unvulcanized rubber as a material of the rubber material, the rubber material can be vulcanized by heating at the time of injection molding.
For example, when forming the tire tread of the present invention, a belt-like tread member having a tread pattern composed of a plurality of grooves on the contact surface with the road surface can be formed by injection molding. In this case, one tread member is wound around the tire frame body, the temperature on the tread member side is set higher than the temperature on the tire frame body side using a hot runner or the like, and the tread member is formed on the crown portion surface of the tire frame body by heating. Can be welded. Thereby, the tire by which the tread part was welded to the crown part surface of a tire frame can be formed. In addition, after forming the tire frame body, the tire frame body is placed in a mold, a composition containing a resin material or a rubber material is injected into the mold, and then cooled, and then the crown surface of the tire frame body A tire having a tread portion welded thereto may be formed. However, the manufacturing method of the tire tread of the present invention is not limited to these methods, and any known method can be used in appropriate combination.

<Tire>
The tire of the present invention includes the above-described tire tread of the present invention and a tire skeleton. Since the tire of the present invention includes the above-described tire tread of the present invention, the tire has excellent dry grip performance.

[Tire frame]
The material of the tire frame body in the present invention is not particularly limited and may be either rubber or resin, but from the viewpoint of compatibility with the tire tread and the like, the tire frame body is a tire frame body formed of resin (hereinafter, It is preferably simply referred to as “resin skeleton”. Examples of the resin material used for the resin skeleton include the same resin as the resin material included in the tire tread of the present invention. The resin materials contained in the tire skeleton and the tire tread may be the same or different, but are preferably the same from the viewpoints of improving moldability and improving production efficiency. Further, the tire tread and the tire frame body may be directly bonded, or may be interposed via an adhesive layer or the like.
When the tire skeleton is formed using the acid-modified polyolefin-based thermoplastic elastomer, the reinforcement cord is wound around the outer periphery of the tire skeleton, or the reinforcement cord layer attaches the reinforcement cord to the outer periphery of the tire skeleton. When it is formed by being embedded in the part, it is possible to improve the adhesion with the reinforcing cord.

[Tire manufacturing method]
The manufacturing method of the tire of this invention is not specifically limited, A well-known manufacturing method can be used. For example, the tire tread of the present invention and a separately manufactured tire frame may be heat-sealed, or may be bonded via an adhesive layer. Further, from the viewpoint of improving productivity, the tire tread and the tire frame of the present invention can be formed in a lump. In this case, for example, the tire can be manufactured by injection molding using a resin material of the same type as the resin material that is a continuous phase of the tire tread for the tire frame.

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

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

  Here, the tire case 17 of this embodiment can use what added each additive to the resin composition containing the polyolefin-type thermoplastic resin elastomer as a resin material, for example.

  In the present embodiment, the tire case 17 is formed of a single resin material. However, the present invention is not limited to this configuration, and each part of the tire case 17 is similar to a conventional general rubber pneumatic tire. You may use the thermoplastic resin material which has a different characteristic for every (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.

  In the present embodiment, the tire frame is formed of a single resin material. However, the tire frame may be configured by combining a plurality of materials for the crown portion, the side portion, and the like of the tire frame in the present invention. it can.

  At this time, the thickness of the crown portion of the tire skeleton can be appropriately selected in order to adjust the elastic modulus of the tire. However, in consideration of the tire weight and the like, 0.5 mm to 10 mm is preferable, and 1 mm to 5 mm is preferable. Further preferred is 1 mm to 4 mm. Similarly, the thickness of the side portion of the tire skeleton is more preferably 0.5 mm to 10 mm, and particularly preferably 1 mm to 5 mm. About the thickness of the crown part and side part of these tire frame bodies, it can be based on the average thickness of the test piece at the time of measuring the above-mentioned elastic modulus. In addition, you may measure the thickness of a tire frame body suitably using a well-known method and apparatus.

  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 resin material. The tire case half 17A is formed by injection molding or the like so that one bead portion 12, one side portion 14, and a half-width crown portion 16 are integrated with each other so as to face each other. It is formed by joining at the tire equator part. The tire case 17 is not limited to the one formed by joining two members, and may be formed by joining three or more members.

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

  As shown in FIG. 1, a reinforcing cord 26 having higher rigidity than the resin material constituting the tire case 17 is wound around the crown portion 16 in the circumferential direction of the tire case 17. The reinforcing cord 26 is wound spirally in a state in which at least a part thereof is embedded in the crown portion 16 in a cross-sectional view along the axial direction of the tire case 17, thereby forming a reinforcing cord layer 28. A tread 30 in which a rubber material is dispersed in a polyolefin-based thermoplastic resin elastomer 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 the crown portion of the tire case of the tire of the first embodiment. As shown in FIG. 2, the reinforcing cord 26 is spirally wound in a state in which at least a part is embedded in the crown portion 16 in a sectional view along the axial direction of the tire case 17. A reinforcing cord layer 28 indicated by a broken line portion in FIG. 2 is formed together with a part of the outer peripheral portion 17. The portion embedded in the crown portion 16 of the reinforcing cord 26 is in close contact with the resin material constituting the crown portion 16 (tire case 17). As the reinforcing cord 26, a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (twisted wire) obtained by twisting these fibers such as a steel cord twisted with a steel fiber can be used. In the present embodiment, a steel cord is used as the reinforcing cord 26.

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

A tread 30 is disposed on the outer circumferential side of the reinforcing cord layer 28 in the tire radial direction. The tread 30 is made of a polyolefin-based thermoplastic resin elastomer in which a rubber material is dispersed. As shown in FIG. 2, in the present embodiment, the tread 30 is in direct contact with the crown portion 16 of the tire case 17. The tread 30 and the crown portion 16 are welded at the interface. The tread 30 is preferably superior in wear resistance to the resin material constituting the tire case 17. Further, the tread 30 is formed with a tread pattern including a plurality of grooves on the ground contact surface with the road surface in the same manner as a conventional rubber pneumatic tire.
Hereinafter, the manufacturing method of the tire of this embodiment is explained.

(Tire case molding process)
First, a tire case half is formed using a resin material containing a polyolefin-based thermoplastic resin elastomer as described above. These tire cases are preferably formed by injection molding. Next, the tire case halves supported by the 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 junction part (butting part) periphery of the tire case half body 17A may be pressed with a predetermined pressure. Next, the periphery of the joint portion of the tire case half is pressed at a temperature equal to or higher than the melting point (or softening point) of the resin material constituting the tire case. When the joining portion of the tire case half is heated or 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 the joining mold, but the present invention is not limited to this, and the joining portion is heated by, for example, a separately provided high-frequency heater. 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, although not shown in the drawings, the heated reinforcing cord 26 is wound while being embedded in the outer peripheral surface of the crown portion 16 using a reel, a cord heating device, and a cord supply device provided with various rollers. Thus, the reinforcing cord layer 28 can be formed on the outer peripheral side of the crown portion 16 of the tire case 17.

(Exterior member installation process)
Next, the tread 30 is installed on the outer peripheral surface of the tire case 17. There is no particular limitation on the method of forming the tread 30 and the method of mounting on the tire case 17, but for example, the belt-shaped tread 30 having a tread pattern composed of a plurality of grooves is formed in advance on the ground contact surface with the road surface by injection molding, The tread 30 can be welded to the outer peripheral surface of the tire case 17 by winding the tread 30 around the tire case 17 and heating the tread 30 using a hot runner or the like. The tread 30 may be vulcanized after injection molding.

  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 a resin material, and the tread 30 is formed using a polyolefin-based thermoplastic resin elastomer in which a rubber material is dispersed. Will improve. The tire 10 is light in weight because it has a simple structure as compared with a conventional rubber tire. Furthermore, since the tire case 17 and the tread 30 can be injection-molded, and the tread 30 is directly welded to the tire case 17, the step of applying an adhesive when the tread 30 is attached to the tire case 17 is omitted. be able to. For this reason, the tire 10 of this embodiment is very excellent in productivity.

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

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

  Further, since an annular bead core 18 made of a metal material is embedded in the bead portion 12, the tire case 17, that is, the tire 10 is strong against the rim 20 like the conventional rubber pneumatic tire. Retained.

  Furthermore, since a seal layer 24 made of a rubber material having a sealing property than the resin material constituting the tire case 17 is provided at a portion of the bead portion 12 that contacts the rim 20, the tire 10 and the rim 20 The sealing performance between the two is improved. For this reason, compared with the case where it seals only with the rim | limb 20 and the resin material which comprises the tire case 17, the air leak in a tire is suppressed further. Further, the rim fit property is improved by providing the seal layer 24.

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

  Further, although it is easy to manufacture the reinforcing cord 26 in a spiral manner, a method of making the reinforcing cord 26 discontinuous in the width direction 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 is limited to this configuration. It may be a complete tube shape.

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

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

<Example 1>
First, the materials for the continuous phase and the dispersed phase shown in Table 1 below were kneaded for 5 minutes with a lab plast mill apparatus (manufactured by Toyo Seiki Co., Ltd.) to prepare a tread composition.
A tire having the structure shown in FIG. 1 including a tire tread and a tire skeleton was manufactured by injection molding using the tread composition.
A polyolefin-based thermoplastic elastomer ("Prime TPO F-3740" manufactured by Prime Polymer Co., Ltd .; ethylene-propylene copolymer) was used as the material for the tire frame. Further, a steel cord as a reinforcement cord was welded to a tire frame body using an acid-modified polyolefin-based thermoplastic elastomer (“Admer QE060” manufactured by Mitsui Chemicals, Inc., an acid-modified product of an ethylene-propylene copolymer). .

[Evaluation of dry grip properties]
The dry grip properties of the manufactured tires were evaluated using an indoor drum tester.
In the drum testing machine, the test tire mounted on the drum testing machine is rolled at a constant speed, and the front tire in the state where the vehicle is being steered while gradually giving a slip angle is simulated. The side force to be measured was measured. In addition, a vehicle equipped with test tires was turned on a certain round course in a dry state, and the maximum lateral acceleration (G) that could be cornered was measured. In addition, a test result is set as the index display which made the index display which set the tire provided with the resin tread of the comparative example 1 as 100, and shows that it is so favorable that a numerical value is large. The results are shown in Table 1.

[Evaluation of wear resistance]
Abrasion resistance was displayed as an index with the value in Comparative Example 1 being 100, using a Lambone-type wear tester, measuring the wear amount at a slip rate of 25% at room temperature, and using the reciprocal value. Therefore, it shows that abrasion resistance is so favorable that a numerical value is large. The results are shown in Table 1.

[Evaluation of injection moldability]
The injection moldability was evaluated as “A” in which tire treads could be produced by injection molding through Examples and Comparative Examples, and “C” in which tire treads could not be produced by injection molding. The results are shown in Table 1.

(Evaluation of low loss)
Using a viscoelasticity measuring device (Rheometrics), loss tangent (tan δ) was measured at a temperature of 60 ° C., a strain of 0.3%, and a frequency of 35 Hz, and evaluated according to the following criteria. In addition, it is excellent in low-loss property (low rolling resistance), so that tan-delta is small.
A: tan δ is 0.12 or less B: tan δ is greater than 0.12 and 0.15 or less C: tan δ is greater than 0.15 Calculation was performed according to the following formula so that the measured value (tan δ _C2 ) of Comparative Example 2 which was a low-loss material was 100, and a converted value was obtained. The results are also shown in Table 1. In addition, it is excellent in low-loss property, so that this conversion value is large.
Formula: Conversion value = (tan δ _C2 / tan δ) × 100

<Examples 2 to 4>
A tire was produced in the same manner as in Example 1 except that the type or content of the dispersed phase was changed as shown in Table 1, and dry grip properties, wear resistance, and injection moldability were evaluated. The results are shown in Table 1.

<Example 5>
A tire was produced in the same manner as in Example 2 except that an adhesive (Toagosei Co., Ltd., “Aron Melt PPET”) was further added to the tread composition in the content shown in Table 1, and dry grip properties were obtained. The wear resistance and injection moldability were evaluated. The results are shown in Table 1.

<Comparative Example 1>
A tire was manufactured in the same manner as in Example 1 except that the tire tread was formed using rubber A shown in Table 1, and dry grip properties, wear resistance, and injection moldability were evaluated. The results are shown in Table 1.

<Comparative example 2>
A tire was manufactured in the same manner as in Example 1 except that the tire tread was formed using the resin A shown in Table 1, and dry grip properties, wear resistance, and injection moldability were evaluated. The results are shown in Table 1.

<Comparative Examples 3-4>
A tire was produced in the same manner as in Example 1 except that the content of the rubber particles A used in the dispersed phase was changed as shown in Table 1, and dry grip properties, wear resistance, and injection moldability were evaluated. The results are shown in Table 1.

<Comparative Example 5>
A tire was produced in the same manner as in Example 1 except that the continuous phase was changed to rubber A shown in Table 1, and dry grip properties, wear resistance, and injection moldability were evaluated. The results are shown in Table 1.

Abbreviations in Table 1 mean the following. In Table 1, the numerical value indicating each component means “part by mass”.
Resin A: Olefin block copolymer resin, manufactured by Dow Corning (product name “INFUSE 9507”)
・ Rubber A: Rubber composition produced by the following formulation

* 1: “# 1500”, manufactured by JSR Co., Ltd. * 2: “Nipseal AQ”, manufactured by Tosoh Silica Co., Ltd. * 3: Trademark “Si69” manufactured by Degussa, bis (3-triethoxysilylpropyl) tetra Sulfide * 4: N- (1,3-dimethylbutyl) -N′-phenyl-p-phenylenediamine * 5: N, N′-dicyclohexyl-2-benzothiazolylsulfenamide * 6: Diphenylguanidine * 7: Dibenzothiazyl disulfide

Rubber particles A: Muraoka Rubber Industry Co., Ltd. (trade name “TB30”)
・ Reclaim rubber A: manufactured by Muraoka Rubber Co., Ltd. (trade name “Tire Riku White Line”)

10 tires, 12 bead parts, 14 side parts, 16 crown parts (peripheral parts), 17 tire cases (tire frame bodies), 18 bead cores, 20 rims, 21 bead seats, 22 rim flanges, 24 seal layers (seal parts), 26 Reinforcement cord (reinforcement cord member), 28 Reinforcement cord layer, 30 tread, D Reinforcement cord diameter (reinforcement cord member diameter), L Reinforcement cord embedding amount (reinforcement cord member embedding amount)

Claims (7)

Resin material,
A rubber material dispersed in the resin material,
A tire tread in which the content of the rubber material is 5 parts by mass to 50 parts by mass with respect to 100 parts by mass of the resin material.   The tire tread according to claim 1, wherein a content of the rubber material is 10 parts by mass to 30 parts by mass with respect to 100 parts by mass of the resin material.   The tire tread according to claim 1 or 2, wherein the resin material includes a thermoplastic resin elastomer.   The tire tread according to claim 3, wherein the thermoplastic resin elastomer is a polyolefin-based thermoplastic resin elastomer or a polyamide-based thermoplastic resin elastomer.   The tire tread according to any one of claims 1 to 4, further comprising an adhesive.   The tire tread according to any one of claims 1 to 5, which is formed by injection molding. A tire comprising the tire tread according to any one of claims 1 to 6 and a tire skeleton.