JP2003026931A - Thermoplastic elastomer composition and pneumatic tire using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a thermoplastic elastomer composition which comprises a continuous thermoplastic resin phase and a rubber finely dispersed therein in a high content. SOLUTION: This thermoplastic elastomer composition comprises a continuous phase consisting of a thermoplastic resin (A) alone or together with another thermoplastic resin (B) having the same composition and structure and a lower viscosity and a disperse phase consisting of a rubber (C) or a composition (D) containing a rubber. The viscosity and compounding ratio of the elastomer composition satisfy the following expressions: 0.8<ηd1/ηm1<1.2 (1), 1.2<=ηd/ηm<=1.9 (2), 0<=ϕm2/(ϕm1+ϕm2)<=0.3 (3), and ϕd/ϕm×ηm/ηd<1 (4).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic elastomer composition having a thermoplastic resin component as a continuous phase and a rubber component finely dispersed therein as a dispersed phase, and a pneumatic tire using the same as an air permeation preventive layer.

[0002]

2. Description of the Related Art A thermoplastic elastomer composition in which a thermoplastic resin component is a continuous phase, an elastomer component is a dispersed phase, and at least a part of the elastomer component is crosslinked (vulcanized) is generally crosslinked. It is known that the composition has a rubber elasticity function due to the above-mentioned elastomer component, and because of the thermoplastic resin component forming the continuous phase, it is a composition capable of being thermoplastically molded at a high temperature when it melts and flows. . That is, the thermoplastic elastomer composition having such a dispersion structure is characterized in that it can be molded by a processing technique similar to that of the thermoplastic resin while maintaining the properties of the vulcanized rubber.

Compared with vulcanized rubber, the elastomer composition has the advantages that it does not require a vulcanization step, that the scrap produced during molding can be recycled, and that the weight can be reduced. In particular, a thermoplastic elastomer composition in which an elastomer component forming a dispersed phase and a thermoplastic resin forming a continuous phase and at least a part or all of them are crosslinked (vulcanized) during kneading, that is, dynamically crosslinked (vulcanized) Is
In particular, it is possible to obtain a product having excellent mechanical and physical properties as a rubber elastic body, compression set resistance, oil resistance and the like, and its application is in addition to conventional rubber applications, automobile parts, building materials, medical equipment, It can be applied to general industrial materials.

The above-mentioned thermoplastic resin composition, when used as an air permeation preventive layer of a pneumatic tire,
Since its gas permeability is mainly controlled by the gas permeability of the thermoplastic resin component, it is possible to obtain sufficient air permeation-preventing property, but its flexibility and durability against bending fatigue are not always sufficient, and There is a problem in that the adhesiveness to a rubber layer such as a carcass layer adjacent to the air permeation preventive layer is not sufficient.

[0005]

A method of improving the fatigue resistance of a thermoplastic elastomer composition by dispersing a rubber component as a dispersed phase in a continuous phase of a thermoplastic resin and dynamically crosslinking (vulcanizing) it depending on the case. Are known as described above. In particular, in order to improve the bending fatigue resistance in a low temperature range of −20 ° C. or lower, it is necessary to achieve both fine dispersion of rubber and reduction of elastic modulus.

An example in which the difference in viscosity during kneading of a rubber / resin mixed system and the dispersed particle diameter of rubber are focused has been known in the past.
Above all, it is found that when the melt viscosity of rubber / resin is brought close to 1, the dispersed particle size of rubber becomes the smallest. Wu: Pol
ym, Eng. Sci. 27. vol 5,1987. However, in the rubber / resin mixed system, the viscosity and volume ratio relational expression φd /
From φm × ηm / ηd <1, φd when ηd / ηm = 1
Since it was <0.5, it was difficult to reduce the elastic modulus of the rubber / resin composition. On the other hand, when a rubber and a resin having different viscosities are mixed, the compounding amount of the rubber can be increased and the elastic modulus can be lowered, but there is a problem that the rubber dispersion particle size becomes large and the fatigue resistance decreases. In particular, in a low temperature range of -20 ° C or lower, it is difficult to improve fatigue resistance because the thermoplastic resin has a high elastic modulus.

Therefore, according to the present invention, in the thermoplastic elastomer composition, the rubber component is finely dispersed as a dispersed phase in the continuous phase of the thermoplastic resin, and the compounding amount of the rubber is increased to lower the elastic modulus, It is to provide a rubber composition having sufficient fatigue resistance even in a low temperature range of ℃ or less.

[0008]

According to the present invention, (i)
Thermoplastic resin (A) or (ii) Thermoplastic resin (A) and a mixture of thermoplastic resin (B) having the same composition and structure and low viscosity as the continuous phase, and rubber (C) or a rubber composition containing the same (D) as a dispersed phase, and the viscosity and blending ratio thereof are as follows: 0.8 <ηd1 / ηm1 <1.2 (1) 1.2 ≤ ηd / ηm ≤ 1.9 (2) 0 ≤ φm2 / (φm1 + φm2) ≦ 0.3 (3) φd / φm × ηm / ηd <1 (4) (wherein, ηd1: melt viscosity of rubber (C) ηm1: melt viscosity of thermoplastic resin (A) φm1: Volume fraction of thermoplastic resin (A) φm2: Volume fraction of thermoplastic resin (B) ηd: Melt viscosity of rubber (C) or rubber composition (D) φd: Rubber (C) or rubber composition (D) Volume fraction ηm of): Viscosity ηm1 of the thermoplastic resin (A) or the thermoplastic resin (A) and heat resistance RESIN (B) ηm3 = ηm1 × viscosity Itaemu3 is defined by the following formula of the mixture of the viscosity of the mixture Itaemu3 thermoplastic resin (A) and thermoplastic resin (B) of φm1 / (φm1 + φm2) + ηm2
× φm2 / (φm1 + φm2) φm: Volume fraction of thermoplastic resin (A) φm1 or volume fraction of mixture of thermoplastic resin (A) and thermoplastic resin (B) φm3 Thermoplastic resin (A) and thermoplastic resin The volume fraction φm3 of the mixture of (B) is defined by the following formula: φm3 = φm1 + φm2 φd1: Volume fraction ηd2 of rubber (C): Melt viscosity of rubber composition (D) φd2: Rubber composition (D) Volume fraction ηm2: Melt viscosity of the thermoplastic resin (B) (however, ηm1>
A thermoplastic elastomer composition satisfying ηm2) is provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have added a proper amount of a filler or the like to butyl rubber to increase the viscosity, and blended an appropriate amount of a low-viscosity component with a thermoplastic resin to maintain the fine dispersion of the rubber, It was found that it is possible to increase the compounding amount. According to the present invention, the amount of rubber compounded can be increased while maintaining the fine dispersion of rubber, so that sufficient fatigue resistance can be provided even in a low temperature range of -20 ° C or lower.

In the present invention, (i) the thermoplastic resin (A) or (ii) the thermoplastic resin (B) having the same composition and structure as the thermoplastic resin (A) but different viscosities is used as a continuous phase, and Into the continuous phase (matrix), a general rubber compounding agent such as a reinforcing material, a softening agent (plasticizer, oil), a cross-linking agent, and an antiaging agent is added to the rubber simple substance (C) or the rubber (C) as a rubber component. The obtained rubber composition (D) is uniformly and finely dispersed. The average particle size of the dispersed rubber is preferably 0.1 to 5
μm, and more preferably 0.1 to 3 μm.

In the present invention, the viscosity and volume fraction of the thermoplastic resin (A) are respectively ηm1 and φm1, and the viscosity and volume fraction of the thermoplastic resin (B) are respectively η.
m2 and φm2, the viscosity and the volume fraction of the raw rubber (C) are respectively ηd1 and φd1, and the viscosity and the volume fraction of the rubber composition (D) containing the rubber (C) are respectively ηd2 and φd2. When the above formula (1),
It is necessary to satisfy the relationships (2), (3) and (4).

The above formula (1) is a range in which the viscosity ratio of the resin A / raw material rubber C is close to 1.0, and the formula (2) is the same as the rubber (C) or the rubber composition (D). It is the limit range of the viscosity ratio of the resin (A) or the mixture of the thermoplastic resin (A) and the thermoplastic resin (B), and the formula (3) is a case where a part of the resin (A) is replaced with the resin (B). Thus, resin B can be blended up to 30% of resin A. If it is out of the range of (1) to (3), the rubber dispersed particle size becomes large and the durability tends to decrease, which is not preferable.

On the other hand, in the formula (4), the rubber (C) or the rubber composition (D) is used as the dispersed phase to form the resin (A) (or the resin (A)).
And (B) if this formula is not satisfied under the conditions necessary for taking the structure of the thermoplastic elastomer composition dispersed in the continuous phase, the rubber or the rubber composition becomes the continuous phase (matrix) and has the desired thermoplasticity. Is not preferable because it does not show. In the present invention, the viscosity ratio of the original rubber (C) and the thermoplastic resin (A) should be close to 1, and the compounding amounts of the reinforcing material and other compounding agents and the low-viscosity resin (B) should be adjusted appropriately. This makes it possible to increase the rubber compounding amount while ensuring the fine dispersion of the rubber.

The thermoplastic resin composition (A) or (B) used in the thermoplastic elastomer composition of the present invention is, for example, a polyamide resin (for example, nylon 6 (N
6), nylon 66 (N66), nylon 46 (N4
6), nylon 11 (N11), nylon 12 (N1
2), nylon 610 (N610), nylon 612
(N612), nylon 6/66 copolymer (N6 / 6
6), nylon 6/66/610 copolymer (N6 / 66
/ 610), nylon MXD6 (MXD6), nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP
Copolymer, nylon 66 / PPS copolymer, polyester resin (eg polybutylene terephthalate (PB)
T), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), PET / PEI copolymer, polyarylate (PAR), polybutylene naphthalate (PBN), liquid crystal polyester, polyoxyalkylene diimidic acid / polybutyrate terephthalate Aromatic polyesters such as copolymers), polynitrile resins (for example, polyacrylonitrile (PAN), polymethacrylonitrile, acrylonitrile / styrene copolymer (AS), methacrylonitrile / styrene copolymer, methacrylonitrile / styrene) / Butadiene copolymer),
Polymethacrylate resin (for example, polymethyl methacrylate (PMMA), polyethyl methacrylate), polyvinyl resin (for example, vinyl acetate (EVA), polyvinyl alcohol (PVA), vinyl alcohol / ethylene copolymer (EVOH), polychlorination Vinylidene (PVD
C), polyvinyl chloride (PVC), vinyl chloride / vinylidene chloride copolymer, vinylidene chloride / methyl acrylate copolymer), cellulose resin (eg cellulose acetate, cellulose acetate butyrate), fluorine resin (eg polyvinylidene fluoride). (PVDF), polyvinyl fluoride (P
VF), polychlorofluoroethylene (PCTFE),
Tetrafluoroethylene / ethylene copolymer (ETF
E)), imide resin (for example, aromatic polyimide (P
I)) etc. can be mentioned.

The preferred thermoplastic resin (A) or (B) of the thermoplastic elastomer composition of the present invention has a melting point of 1
Nylon resin at 50 to 250 ° C, for example, nylon 6
(N6), Nylon 11 (N11), Nylon 12 (N
12), nylon 6/66 copolymer (N6 / 66), nylon 610 (N610) and nylon 612 (N6)
12) and the like.

As the rubber component of the rubber (C) or the rubber composition (D) of the thermoplastic elastomer composition, a diene rubber and its hydrogenated product (eg, NR, IR, epoxidized natural rubber, SBR, BR) are used. (High cis BR and low cis BR), NBR, hydrogenated NBR, hydrogenated SBR, olefin rubber (for example, ethylene propylene rubber (E
PDM, EPM), maleic acid-modified ethylene propylene rubber (M-EPM), IIR, isobutylene and aromatic vinyl or diene monomer copolymer, acrylic rubber (ACM), ionomer), halogen-containing rubber (for example, Br-IIR). , Cl-IIR, bromide of isobutylene paramethylstyrene copolymer (Br-IPMS),
Chloroprene rubber (CR), hydrin rubber (CHR),
Chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), maleic acid modified chlorinated polyethylene (M-CM), silicone rubber (for example, methyl vinyl silicone rubber, dimethyl silicone rubber, methylphenyl vinyl silicone rubber), sulfur-containing rubber (For example,
Polysulfide rubber), fluororubber (for example, vinylidene fluoride rubber, fluorovinyl ether rubber, tetrafluoroethylene-propylene rubber, fluorosilicone rubber, fluorophosphazene rubber)
In particular, as a modified polyisobutylene-based rubber, an isobutylene-isoprene copolymer rubber having a halogen group introduced, and / or an isomonoolefin such as an isobutylene-paramethylstyrene copolymer rubber having a halogen group introduced. A halogen-containing copolymer rubber of p-alkylstyrene is effectively used. For the latter, "Exxpro" manufactured by Exxon Corporation is preferably used.

According to the present invention, the amount of the rubber dispersed as the dispersed phase in the continuous phase of the thermoplastic resin component is not particularly limited, but it is preferably large in order to reduce the elastic modulus of the obtained thermoplastic elastomer composition. Specifically, the rubber or the rubber composition is 50% by volume or more, preferably 52.5% by volume or more, based on the total amount of the rubber or the rubber composition and the resin.
More preferably, it is 55 to 70% by volume.

The thermoplastic resin constituting the matrix of the above-mentioned thermoplastic elastomer composition generally contains plasticizers and softeners for improving processability, dispersibility, heat resistance and antioxidant properties. A filler, a reinforcing material, a processing aid, a stabilizer, an antioxidant and the like may be appropriately blended as necessary.

In the present invention, the method for producing the thermoplastic elastomer composition in which the elastomer is finely dispersed in the matrix resin is not particularly limited, but it can be produced, for example, as follows. That is, first, the elastomer component and the compounding agent component are kneaded in advance using a general kneader, Banbury mixer or the like until a homogeneous mixed state is obtained to produce an elastomer composition. At this time, it is possible to add an appropriate amount of a filler such as carbon black, oil, or calcium carbonate to the elastomer composition. If necessary, a vulcanizing agent or a crosslinking agent for the elastomer, a vulcanization aid, a vulcanization accelerator, etc. may be added.
The elastomer composition and the matrix resin composition thus produced are put into a biaxial kneader or the like and melt-kneaded. When the elastomer composition excluding the vulcanizing compounding agent is used in the elastomer composition, the vulcanizing compounding agent is added at the stage of kneading the elastomer composition and the matrix resin composition and further kneaded to obtain the elastomer composition. The product is dynamically crosslinked to obtain the desired thermoplastic elastomer composition.

Further, various compounding agents for the thermoplastic resin component or the elastomer component may be mixed in advance before the above-mentioned biaxial kneading, but may be added during the above-mentioned biaxial kneading. As the melt-kneading conditions for kneading with the elastomer composition and the matrix resin composition and for dynamic vulcanization of the elastomer composition, the temperature may be equal to or higher than the temperature at which the thermoplastic resin melts. The shear rate during kneading is 500 to 7500 sec.
^-1 is preferable, and the kneading time is preferably about 30 seconds to 10 minutes.

The thermoplastic elastomer composition thus obtained is subsequently used in a sheet, film or sheet using a T-type sheeting die at the tip of a single-screw extruder, a tubing die having a straight or crosshead structure, a cylindrical die for blow molding, or the like. If formed into a tube shape, it can be used as an air permeation preventive layer for pneumatic tires, hoses and the like. The obtained thermoplastic elastomer composition, once taken into a strand shape and pelletized,
You may make it shape | mold with the said single screw extruder for resins.

The sheet-shaped or tube-shaped molded product thus obtained is a thermoplastic elastomer composition in which the morphology of the rubber elastomer / matrix resin blend of the present invention is controlled, and is crosslinked (vulcanized) in the matrix resin. Since it is composed of a composition having a phase structure in which rubber is finely dispersed, it has very soft characteristics as compared with a resin. By making the matrix resin excellent in gas permeation resistance, it can be made to have low-temperature durability and excellent gas permeation resistance. It can be effectively used for hose tubes and hose covers of gas permeable hoses.

[0023]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but it goes without saying that the present invention is not limited to the following Examples.

Examples 1 to 10 and Comparative Examples 1 to 9 The raw materials used in the following examples are as follows.

──────────────────────────────────── Material Name Compound Manufacturer Grade IPMS-1 Modified Isomono Olefin ・ Exxon Mobil Exxpro MDX 89-4 Paraalkylstyrene Chemical IPMS-2 Modified isomonoolefin ・ Exxon Mobil Exxpro MDX 89-1 Paraalkylstyrene Chemical Ny666-1 6, 66 Copolymer Nylon Mitsubishi Chemical Novamid 2010R Ny666-2 6 , 66 Copolymer Nylon Toray Amilan CM6001FS Ny11-1 11 Nylon ATOFINA Rilsan BMN O Ny11-2 11 Nylon ATOFINA Rilsan BESN O TL Silica Silicon dioxide Nippon Silica Nipseal AQ Si69 Bis- (3-triethoxysilyl) Degussa Hulls Si69-Propyl Tetra Sulfide Carbon FEF Nippon Carbon HTC # 100 Plasticizer Alkylbenzene Sulfone Daihachi Chemical Co., Ltd. BM-4 Zinc Amido Oxide ZnO Shodo Chemical Zinc Hua No. 3 Zinc Stearate St- Zn Shodo Kagaku Zinc stearate Stearic acid St-acid Nippon Oil & Fats Stearic acid ────────────────────────────────── ───

The melt viscosity of the above resin is as follows. Resin melt viscosity unit (poise) Ny11-1 2000 Ny11-2 400 Ny11-1 (plasticizer 10%) 1700 Ny11-2 (plasticizer 10%) 300 Ny666-1 1800 Ny666-2 500 Ny666-1 (plasticizer 7) %) 1300 Ny666-2 (plasticizer 7%) 230

Preparation of Rubber Components (Rubber 1 to Rubber 8) The raw rubbers shown in Table I and their compounding agents (parts by weight) were mixed in a Banbury mixer at 110 ° C. for 4 minutes, and the resulting rubber composition was a rubber. Pelletized with a pelletizer.
In order to obtain a good dispersion state in the case where the reinforcing material was blended, first, the rubber and the reinforcing material were mixed at 180 ° C. for 5 minutes, cooled, and then the remaining compounding agent was added and mixed at 110 ° C. for 4 minutes.

[0028]

[Table 1]

Preparation of Thermoplastic Elastomer Composition The pellets of the rubber composition and the pellets (part by weight) of the resin component shown in Tables II and III are put into a twin-screw kneader (TEX44, manufactured by Japan Steel Works) and melt-kneaded. I went. Kneading condition is 2
The shear rate was 1200 s ⁻¹ at 40 ° C. for 3 minutes. The cross-linking is done dynamically in the extruder. The material was continuously discharged from the extruder in the form of a strand, cooled with water and then cut with a cutter to obtain a pellet-shaped thermoplastic elastomer composition. In order to obtain a sheet for a physical property test, the formed pellets of the thermoplastic elastomer composition were put into a single-screw extruder equipped with a sheeting die and processed into a sheet.

Evaluation Method of Generated Thermoplastic Elastomer Material Physical Property Test A tensile test was conducted according to JIS K 6251 and JIS K 7161 to measure the elastic modulus (Young's modulus).

Melt viscosity Here, the melt viscosity means the melt viscosity of an arbitrary temperature and component during kneading, and the melt viscosity of each rubber or polymer material is
Since there is a dependency of temperature, shear rate and shear stress, the temperature and the shear rate of rubber and polymer materials are generally measured at an arbitrary temperature in a molten state flowing in a thin tube, especially in the temperature range at the time of kneading. More melt viscosity is measured.

[0032]

[Equation 1]

A capillary rheometer Capirograph 1C manufactured by Toyo Seiki Co., Ltd. was used for measuring the melt viscosity. The measurement temperature was 240 ° C. and the shear rate was 1200 sec ⁻¹ according to the kneading conditions.

Permeability (Air Permeability Coefficient) Measurement Method According to JIS K 7126 "Plastic Film and Sheet Gas Permeability Test Method (Method A)" (unit: cm)
³・ cm / cm ²・ sec ・ cmHg). Test piece: The film sample prepared in each example was used. Test gas: Air (N ₂ : O ₂ = 8: 2) Test temperature: 30 ° C. In order to use the thermoplastic elastomer composition in the air permeation preventive layer (inner liner), the lower the gas permeability, the better, and preferably 50. × 10 ^-12 cm ³ · cm / cm ² · sec ·
cmHg or less, more preferably 30 × 10 ^-12 cm ³ · cm / cm
² -sec-cmHg or less is recommended.

Method for Measuring Dispersed Rubber Particle Size Ultrathin sections of the above film were prepared using a microtome and then stained with RuO ₄ or the like, followed by transmission electron microscopy (Hitachi H
-800 type) was used for direct observation.

-20 ° C. constant strain test A thermoplastic elastomer composition sheet-molded with a sheeting die was laminated with the following adhesive layer and rubber sheet to prepare a sample.

Adhesive layer blending component parts by weight manufacturer, grade epoxy modified SBS 50 manufactured by Daicel Chemical, Epofriend AT1020 SBS 50 Kraton polymer, D1102JS terpene resin 50 Yasuhara Chemical, YS resin D105 rubber layer blending component part by weight manufacturer, grade natural rubber 80 RSS # 1 SBR1502 20 Nippon Zeon, Nipol 1502 FEF Carbon Black 50 Chubu Carbon, HTC100 Stearic Acid 2 Kao, Lunak YA Zinc Oxide 3 Shodo Kagaku, Zinc Hua No. 3 Sulfur 3 Karuizawa Smelting Co., Powder Sulfur Vulcanization accelerator 1 Ouchi Shinko Chemical Co., Nox Cellar NS-P Aroma Oil 2 Nippon Oil Co., Ltd.

The obtained laminated test sheets were punched out according to JIS dumbbell No. 2 type (JIS K 6251), and then a dumbbell-shaped sample was attached to a fatigue tester to conduct a constant strain fatigue test. The test was completed when the distance between chucks was 54 mm, the tensile strain rate was 40%, the repeated tensile frequency was 6.67 Hz, and the test temperature was -20 ° C. When the thermoplastic elastomer composition on the sample surface cracked. The judgment was evaluated as ◯ when the number of repetitions before cracking was 5 million times or more, and as x when 5 million times or less. In addition, when the number of repetitions was 10 million times or more and no cracks were formed, it was discontinued.

-20 ° C Tire Durability Test The laminated sheet with the adhesive is used as a tire member such as a carcass, a belt, a side tread, and a cap tread with the thermoplastic elastomer composition on the inner side (the adhesive layer is on the rubber side). A test tire was produced by molding and vulcanizing by a normal tire molding method. The size is 175 / 80R14
And The test was performed by applying an internal pressure of 175 kPa to the tire assembled on the rim, a load of 4.5 kN, a speed of 80 km / h on a φ1707 mm drum, and an ambient temperature of -20 ° C. 10,000
The inner surface of the tire after running for km was inspected, and the presence or absence of cracks was visually observed and evaluated.

The results are shown in Tables II and III.

[0041]

[Table 2]

[0042]

[Table 3]

[0043]

[Table 4]

[0044]

INDUSTRIAL APPLICABILITY As shown in the results of Tables II and III, according to the present invention, it is possible to obtain a thermoplastic elastomer composition having excellent bending fatigue property at low temperature and low gas permeability. It can be suitably used for low gas permeable layers such as tires and hoses.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuhiro Ikawa             2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Co., Ltd.             Ceremony Company Hiratsuka Factory (72) Inventor Daisuke Kanari             2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Co., Ltd.             Ceremony Company Hiratsuka Factory (72) Inventor Kazuo Arakawa             2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Co., Ltd.             Ceremony Company Hiratsuka Factory F-term (reference) 4J002 AC012 AC032 AC062 AC082                       AC092 AC112 AC122 BB152                       BB242 BC052 BC061 BD041                       BD101 BD122 BD141 BD151                       BE021 BF021 BG051 BG061                       BG101 BN151 CF041 CF061                       CF071 CF081 CF161 CL031                       CL091 CM041 CP032 GN01

Claims (7)

[Claims] 1. A mixture of (i) a thermoplastic resin (A) or (ii) a thermoplastic resin (A) and a thermoplastic resin (B) having the same composition and structure and a low viscosity as a continuous phase, and a rubber ( C) or a rubber composition (D) containing the same as a dispersed phase, and the viscosity and blending ratio thereof are represented by the following formula: 0.8 <ηd1 / ηm1 <1.2 (1) 1.2 ≦ ηd / ηm ≦ 1.9 (2) 0 ≦ φm2 / (φm1 + φm2) ≦ 0.3 (3) φd / φm × ηm / ηd <1 (4) (wherein, ηd1: melt viscosity of rubber (C) ηm1: thermoplastic resin (A) melt viscosity φm1: thermoplastic resin (A) volume fraction φm2: thermoplastic resin (B) volume fraction ηd: rubber (C) or rubber composition (D) melt viscosity φd: rubber ( C) or rubber composition (D) volume fraction ηm: viscosity of thermoplastic resin (A) ηm1 or thermoplasticity Viscosity ηm3 of mixture of resin (A) and thermoplastic resin (B) The viscosity ηm3 of mixture of thermoplastic resin (A) and thermoplastic resin (B) is defined by the following formula: ηm3 = ηm1 × φm1 / (φm1 + φm2) + Ηm2
× φm2 / (φm1 + φm2) φm: Volume fraction of thermoplastic resin (A) φm1 or volume fraction of mixture of thermoplastic resin (A) and thermoplastic resin (B) φm3 Thermoplastic resin (A) and thermoplastic resin The volume fraction φm3 of the mixture of (B) is defined by the following formula: φm3 = φm1 + φm2 φd1: Volume fraction ηd2 of rubber (C): Melt viscosity of rubber composition (D) φd2: Rubber composition (D) Volume fraction ηm2: Melt viscosity of the thermoplastic resin (B) (however, ηm1>
A thermoplastic elastomer composition satisfying ηm2). 2. The rubber composition (D) comprises at least one of a rubber (C), a reinforcing material, a plasticizer, an oil and a crosslinking agent.
The thermoplastic elastomer composition according to claim 1, which comprises a seed compounding agent. 3. The thermoplastic elastomer composition according to claim 1 or 2, wherein the thermoplastic resin (A) or the thermoplastic resins (A) and (B) is a polyamide resin. 4. The thermoplastic elastomer composition according to claim 1, wherein the rubber (C) is a halogen-containing copolymer of isomonoolefin / paraalkylstyrene. 5. The thermoplastic elastomer according to claim 1, wherein the thermoplastic resin (A) or the thermoplastic resins (A) and (B) is 6/66 copolymer nylon or 11 nylon. Composition. 6. A nylon plasticizer is added to nylon,
Formulas (2) and (4) are 1.2 ≤ ηd / ηm4 ≤ 1.9 (5) φd / φm4 x ηm4 / ηd <1 (6) (wherein, ηm4 and φm4 are thermoplastic resins (A), respectively) The thermoplastic elastomer composition according to claim 3, which is a melt viscosity and a volume fraction of the resin composition (E) obtained by adding a plasticizer to the resin composition. 7. A pneumatic tire using the thermoplastic elastomer composition according to claim 1 as an inner liner.