JP2013249019A - Tire - Google Patents

Abstract

[PROBLEMS] To provide a tire having excellent heat resistance, chevron cut resistance, and chipping resistance, and improved wear resistance in a high severity region as compared with conventional tires.
A tire according to the present invention comprises a rubber composition in which 40 to 90% by mass of a rubber component is natural rubber and / or polyisoprene rubber, and a dynamic storage elastic modulus (E ′) measured at a strain of 2%. ) Is provided with a tread rubber having an inflection point of 170 ° C. or higher at 100 ° C. or higher.
[Selection] Figure 1

Description

  The present invention relates to a tire.

  Conventional tires, especially tread rubber for high-speed and high-load tires such as aircraft tires and linear motor car tires, have high wear resistance and heat resistance in high severity areas such as high load and high sliding speed. The compatibility with various performances such as chevron cut resistance and chipping resistance has been an issue. Note that chevron cut resistance is, for example, in the case of aircraft tires, when the aircraft is landing, a pine cone-shaped or sacrificial cut scratch received by the edge of a drainage runway groove formed in a direction crossing the runway, It refers to the ability to suppress the occurrence of so-called chevron cuts.

  On the other hand, Patent Document 1 below proposes a technique of using a rubber composition containing an organic thiosulfate compound in a tread as a technique for improving the wear resistance and durability of a tire for a linear motor car. Yes.

Patent Document 2 listed below discloses nitrogen adsorption specific surface area (N ₂ SA), dibutyl phthalate (DBP) oil absorption as a technique for improving the wear resistance, durability and chipping resistance of high-speed and high-load pneumatic tires. Has been proposed in which a rubber composition containing a carbon black having a specific range is used, and a rubber composition having a specific ratio of sulfenamide-based vulcanization accelerator and sulfur is used in the specific range.

  Patent Document 3 below discloses a technique for using a rubber composition containing high-cis polybutadiene, silica and carbon black, and a coupling agent in a tread as a technique for improving the wear resistance of an aircraft tire. Proposed.

  Furthermore, Patent Document 4 listed below discloses a dynamic storage elastic modulus as a tire that achieves a balance between wear resistance in a high severity region and various performances such as heat resistance, chevron cut resistance, and chipping resistance. There has been proposed a tire having a tread in which the minimum point of E ′ (dynamic strain 2%) at 180 ° C. or more is 70% or more of the dynamic storage elastic modulus E ′ (dynamic strain 2%) at 150 ° C.

JP 2000-301908 A JP 2001-253974 A JP 2006-97024 A JP 2009-102469 A

  The tires disclosed in Patent Documents 1 to 4 have high wear resistance and the like, but high-speed and high-load tires are required to have a longer life and high load resistance, and are resistant to high temperatures and high speeds. There is a demand for further improving wear resistance, heat resistance, chevron cut resistance, and chipping resistance.

  Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, have excellent heat resistance, chevron cut resistance and chipping resistance, and improve wear resistance in a high severity region as compared with conventional tires. Is to provide tires.

  In order to achieve the above object, the gist of the present invention is as follows.

  That is, the tire of the present invention comprises a rubber composition in which 40 to 90% by mass of the rubber component is natural rubber and / or polyisoprene rubber, and has a dynamic storage elastic modulus (E ′) measured at a strain of 2%. The tread portion is provided with tread rubber having an inflection point of 170 ° C. or higher at 100 ° C. or higher.

In a preferred example of the tire of the present invention, the rubber composition used for the tread rubber contains carbon black. Here, the nitrogen adsorption method specific surface area of the carbon black (N ₂ SA) of preferably from 140~200m ² / g, more preferably in the range of 140~160m ² / g, the carbon black of dibutyl phthalate (DBP ) The oil absorption is preferably in the range of 120 to 200 mL / 100 g, more preferably in the range of 130 to 160 mL / 100 g. Moreover, it is preferable that the said rubber composition for tread rubber mix | blends 40-60 mass parts of said carbon black with respect to 100 mass parts of said rubber components.

In another preferred embodiment of the tire of the present invention, the rubber component of the rubber composition for tread rubber further has a cis-1,4-bond content of 95% or more and a weight average molecular weight (Mw) of 3 × 10 ^5. Includes polybutadiene rubber that is ˜20 × 10 ⁵ .

  In another preferred embodiment of the tire of the present invention, when the content of the polybutadiene rubber and the polybutadiene rubber in the rubber component of the rubber composition is A mass%, of the total amount of carbon black contained in the rubber composition ( A-5) to (A + 15)% by mass of carbon black pre-kneaded, and natural rubber and / or isoprene rubber, and carbon contained in the pre-kneaded from the total amount of carbon black contained in the rubber composition A tread rubber obtained by kneading a material containing a pre-kneaded material obtained by previously kneading carbon black in an amount excluding black is provided in the tread portion.

  The tire of the present invention is preferable as a tire for high speed and high load, and is particularly preferable as an aircraft tire. In the present specification, the high speed and high load refers to traveling conditions of a speed of 100 km / h to 380 km / h and a load of 10 to 30 tons.

  According to the present invention, a tire that solves the problems of the prior art, has excellent heat resistance, chevron cut resistance, and chipping resistance, and has improved wear resistance in a high severity region compared to conventional tires. Can be provided.

It is a fragmentary sectional view showing one embodiment of a tire of the present invention. Temperature-dynamic storage elastic modulus (E ′) curve (a) and dynamic storage elastic modulus (E ′) of a tread rubber having an inflection point of less than 170 ° C. at 100 ° C. or higher of the dynamic storage elastic modulus (E ′). ) Is a temperature-dynamic storage elastic modulus (E ′) curve (b) of a tread rubber having an inflection point at 100 ° C. or higher of 170 ° C. or higher.

  Below, the tire of the present invention is explained in detail, referring to drawings. FIG. 1 is a partial cross-sectional view showing an embodiment of a tire of the present invention. The tire shown in FIG. 1 extends in a toroidal shape between a pair of bead portions 1, a pair of side portions 2, a tread portion 3 connected to both side portions 2, and a bead core 4 embedded in each bead portion 1. A radial carcass 5 is provided, and a belt 6 disposed on the outer side in the tire radial direction of the crown portion of the carcass 5.

  The radial carcass 5 of the illustrated tire includes a main body part that extends from the tread part 3 through the side part 2 to the bead core 4 of the bead part 1 and a folded part that is folded back around the bead core. ) 5a is folded around the bead core from the inside of the tire to the outside of the tire and reaches the vicinity of the side portion 2, and the other portion (the other one ply) 5b of the carcass 5 It is turned around the bead core to the inside of the tire so as to cover, and stops near the bead core 4. In the tire of the present invention, the structure of the carcass 5 and the number of plies are not limited thereto. Moreover, although the belt 6 of the tire in the illustrated example is composed of a plurality of belt layers, the number of belt layers constituting the belt 6 and the structure of the belt 6 are not particularly limited.

  In the tire of the present invention, a tread rubber composed of a rubber composition containing 40 to 90% by mass of a natural rubber and / or polyisoprene rubber is applied to the tread portion 3, and the tread rubber is The inflection point of the dynamic storage elastic modulus (E ′) measured at a strain of 2% at 100 ° C. or higher is 170 ° C. or higher. More preferably, the tire of the present invention is formed by applying a tread rubber made of a rubber composition containing 50 to 80% by mass of a natural rubber and / or polyisoprene rubber to the tread portion 3. Here, the action of the tread rubber of the tire of the present invention will be described in detail with reference to FIG. (A) of FIG. 2 shows the temperature-dynamic storage elastic modulus (E ′) of a tread rubber of a conventional tire having an inflection point temperature of 100 ° C. or higher of the dynamic storage elastic modulus (E ′) of less than 170 ° C. FIG. 2 (b) shows the temperature-dynamic storage of the tread rubber of the tire according to the present invention in which the temperature of the inflection point at 100 ° C. or higher of the dynamic storage modulus (E ′) is 170 ° C. or higher. It is an elastic modulus (E ') curve.

  As shown in FIG. 2 (a), the tread rubber of the conventional tire has an inflection point temperature of less than 170 ° C. when the dynamic storage elastic modulus (E ′) is 100 ° C. or higher (in this example, 160 ° C. Therefore, the dynamic storage elastic modulus (E ′) at a high temperature, for example, at 220 ° C. was low. When the tread rubber contains a diene rubber such as natural rubber (NR) or polyisoprene rubber (IR), at such high temperatures, the main chain and network structure of the diene rubber are abruptly cut and free ends are Because of the increase, the reinforcing property of the tread rubber was significantly lowered, and the wear resistance and heat resistance were greatly deteriorated. In particular, a tread of a conventional tire using a rubber composition containing a diene rubber such as natural rubber (NR) or polyisoprene rubber (IR) as a rubber component has a dynamic storage elastic modulus (E ′) of less than 170 ° C. The main chain and network structure of the diene rubber were easily cut at a high temperature exceeding 200 ° C. having an inflection point.

  On the other hand, as shown in FIG. 2B, the tread rubber of the tire according to the present invention has a temperature at the inflection point of the dynamic storage elastic modulus (E ′) of 170 ° C. or more (in this example, Therefore, the difference between the dynamic storage modulus (E ′) at 220 ° C. and the dynamic storage modulus (E ′) at the inflection point is relatively small. In addition, the molecular chain of diene rubber such as natural rubber (NR) and polyisoprene rubber (IR) is shifted to higher temperature, so the molecular chain of diene rubber is broken even at high temperatures. Therefore, the decrease in the reinforcing property of the tread rubber is small, and the wear resistance, heat generation resistance, chevron cut resistance, and chipping resistance can be sufficiently maintained.

  In addition, when the temperature of the inflection point at 100 ° C. or higher of the dynamic storage elastic modulus (E ′) measured at 2% strain is less than 170 ° C., including the temperature region of 200 ° C. or lower in addition to the high temperature region, The wear resistance of the tread rubber is lowered, and even if the wear resistance in the temperature range of 200 ° C. or lower is improved, the effect of improving the wear resistance at 200 ° C. or higher is very small.

  Here, as a method of setting the inflection point temperature at 100 ° C. or higher of the dynamic storage modulus (E ′) measured at 2% strain of the tire tread rubber to 170 ° C. or higher, polybutadiene rubber (BR having a high molecular weight) is used. ), A pre-kneaded product of polybutadiene rubber previously kneaded with a predetermined mass% of carbon black, and natural rubber and / or isopropylene rubber previously kneaded with a predetermined mass% of carbon black. And a method obtained by kneading a material containing the preliminary kneaded material.

  Further, when the content of the natural rubber (NR) and / or polyisoprene rubber (IR) in the rubber component of the rubber composition for a tread rubber of a tire is less than 40% by mass, the tread has chevron cut resistance and chipping resistance. Sexually deteriorates. Furthermore, when the content of natural rubber (NR) and / or polyisoprene rubber (IR) in the rubber component exceeds 90% by mass, the wear resistance is deteriorated.

The rubber component of the rubber composition for a tread rubber of the tire of the present invention has a high cis-1,4-bond content of 95% or more and a weight average molecular weight (Mw) of 3 × 10 ^{5 to} 20 × 10 ^5. It is preferable to contain 60% by mass or less of cis-polybutadiene rubber. Abrasion resistance can be improved by including 60 mass% or less of high cis polybutadiene rubber. By using a high cis polybutadiene rubber having a cis-1,4-bond content of 95% or more and a weight average molecular weight (Mw) of 3 × 10 ^{5 to} 20 × 10 ^5, at a high temperature exceeding 200 ° C., and The wear resistance of the tread rubber can be further improved including the temperature range of 200 ° C. or lower. When the cis-1,4-bond content is less than 95%, the effect of improving the wear resistance of the tread rubber at a high temperature and in a temperature range of 200 ° C. or less is small.

If the rubber component of the rubber composition for a tread rubber of the tire of the present invention further has a weight average molecular weight (Mw) of the high cis polybutadiene rubber of 3.0 × 10 ⁵ or more, the wear resistance of the tread rubber composition is high. It becomes more favorable and is more preferably 5.0 × 10 ⁵ or more. Although there is no restriction | limiting in particular in this weight average molecular weight, Usually, about 20 * 10 < ⁵ > is an upper limit.

  As the rubber component of the rubber composition for a tread rubber of the tire of the present invention, it is also possible to use a rubber component other than the above-mentioned natural rubber (NR), polyisoprene rubber (IR), and high cis polybutadiene rubber. The rubber component may be used alone or in a blend of two or more.

  The rubber composition for a tread rubber of a tire of the present invention preferably contains carbon black as a reinforcing filler. When the rubber composition contains carbon black, the reinforcing property of the tread rubber is improved, and the wear resistance, chevron cut resistance, and chipping resistance can be further improved.

The carbon black preferably has a nitrogen adsorption method specific surface area (N ₂ SA) of 140 to 200 m ² / g, and more preferably 140 to 160 m ² / g. When the nitrogen adsorption method specific surface area (N ₂ SA) of carbon black is 140 to 200 m ² / g, since the dispersibility of carbon black in the rubber component is good, the wear resistance of the tread rubber is further improved. The heat resistance is also better. In addition, when the nitrogen adsorption method specific surface area (N ₂ SA) of carbon black is less than 140 m ² / g, the effect of improving the wear resistance of the tread rubber is small, while the nitrogen adsorption method specific surface area (N _{2 of} carbon black) is small. When SA) exceeds 200 m ² / g, the dispersibility of carbon black in the rubber component decreases, and the effect of improving the wear resistance and heat resistance of the tread rubber is small. Further, when the nitrogen adsorption method specific surface area (N ₂ SA) of carbon black is 140 to 160 m ² / g, the dispersibility of carbon black in the rubber component is further improved, and the wear resistance is further improved. The exothermic property is further improved.

  The carbon black preferably has a dibutyl phthalate (DBP) oil absorption of 120 to 200 mL / 100 g, more preferably 130 to 160 mL / 100 g. When the carbon black has a dibutyl phthalate (DBP) oil absorption of 120 to 200 mL / 100 g, the wear resistance of the tread rubber is further improved and the heat generation resistance is also better. Further, when the carbon black has a dibutyl phthalate (DBP) oil absorption of 130 to 160 mL / 100 g, the wear resistance of the tread rubber is further improved and the heat resistance is further improved. In addition, when the dibutyl phthalate (DBP) oil absorption amount of carbon black is less than 120 mL / 100 g, the effect of improving the wear resistance of the tread rubber is high, including at a high temperature exceeding 200 ° C. and a temperature range of 200 ° C. or less. On the other hand, when the dibutyl phthalate (DBP) oil absorption of carbon black exceeds 200 mL / 100 g, the effect of improving the heat resistance is not so great.

  When the rubber composition for a tread rubber of the tire of the present invention contains carbon black, the amount of the carbon black is preferably in the range of 40 to 60 parts by mass with respect to 100 parts by mass of the rubber component. By making the compounding quantity of carbon black into the range of 40-60 mass parts, the abrasion resistance and heat resistance of a tread rubber can be improved more. In addition, when the blending amount of the carbon black is less than 40 parts by mass, the effect of improving the wear resistance of the tread rubber is small including a high temperature exceeding 200 ° C. and a temperature range of 200 ° C. or less. When the blending amount exceeds 60 parts by mass, the effect of improving the heat resistance of the tread rubber is small.

  The rubber composition for a tread rubber of the tire according to the present invention includes a polybutadiene rubber and a total amount of carbon black contained in the rubber composition when the content of the polybutadiene rubber in the rubber component of the rubber composition is A mass%. (A-5) to (A + 15) Pre-kneaded product obtained by preliminarily kneading carbon black of (%) and (A + 15)% by mass, natural rubber and / or isoprene rubber, and the total amount of the carbon black contained in the rubber composition. It is preferable to knead a material containing a pre-kneaded material obtained by previously kneading carbon black in an amount excluding the carbon black contained in. Dynamic storage elastic modulus measured at 2% by constituting a rubber composition with a pre-kneaded product of polybutadiene rubber and a pre-kneaded product of natural rubber and / or isoprene rubber, which were previously kneaded with the above-mentioned proportion of carbon black. The inflection point of (E ′) at 100 ° C. or higher can be shifted to the high temperature side. When the polybutadiene rubber is kneaded with less than (A-5)% by weight of the total amount of carbon black contained in the rubber composition, the wear resistance is lowered. In addition, when kneaded with cis-polybutadiene rubber and (A + 15)% by mass of carbon black in the total amount of carbon black contained in the rubber composition, wear resistance, chevron cut resistance, and chipping resistance are reduced.

  The above-described tire of the present invention is excellent in wear resistance, heat resistance, chevron cut resistance, and chipping resistance in a high severity region. Therefore, as a tire for aircraft and linear motor car, etc. It is particularly preferable as an aircraft tire. The tire of the present invention comprises a rubber composition in which 40 to 90% by mass of the rubber component is natural rubber and / or polyisoprene rubber, and has a dynamic storage elastic modulus (E ′) measured at a strain of 2%. There is no particular limitation except that a tread rubber having an inflection point of 100 ° C. or higher at 170 ° C. or higher is disposed in the tread portion 3, and can be manufactured in the same manner as a conventional tire.

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. In the following examples, (1) cis-1,4-bond content and weight average molecular weight (Mw) of polybutadiene rubber, (2) nitrogen adsorption method specific surface area (N ₂ SA) of carbon black, and dibutyl phthalate (DBP) oil absorption, (3) chevron cut resistance, heat generation resistance, temperature of inflection point of dynamic storage elastic modulus (E ′) at 100 ° C. or higher, and wear resistance, (4) The tire overload drum durability and chipping resistance were measured by the following methods, respectively.

(1-1) Cis-1,4-bond content of polybutadiene rubber The cis-1,4-bond content was calculated by the MORERO method using an infrared spectrophotometer.

(1-2) Weight average molecular weight of polybutadiene rubber (Mw)
The weight average molecular weight (Mw) is measured by gel permeation chromatography [GPC: Tosoh HLC-8020, column: Tosoh GMH-XL (two in series)], and using the differential refractive index (RI). The measurement was performed in terms of polystyrene using monodisperse polystyrene as a standard.

(2-1) Nitrogen adsorption specific surface area of carbon black (N ₂ SA)
It measured based on JISK6217-2: 2001.

(2-2) Dibutyl phthalate (DBP) oil absorption of carbon black Measured according to JIS K 6217-4: 2001.

(3-1) Chevron cut resistance of rubber composition A sheet having a thickness of 2 mm prepared from an unvulcanized rubber composition is vulcanized at 135 ° C for 60 minutes (hereinafter, the vulcanization conditions of the samples are the same). Furthermore, the tensile stress (M300) at 300% elongation was measured in accordance with JIS K 6251: 2004 for a sample piece produced by punching with a JIS-3 dumbbell, and indexed with Comparative Example 1 as 100. It was used as an index of chevron cut resistance of tire treads. The larger the index value, the better the chevron cut resistance.

(3-2) Heat resistance of rubber composition Rebound resilience of a sample piece was measured from a trypso rebound resilience test conducted according to JIS K 6255-1996, and indexed with Comparative Example 1 as 100 by the following formula. .
Heat resistance index = (rebound resilience of the test specimen (resilience) / rebound resilience of the sample piece of Comparative Example 1) × 100 The larger the heat resistance index, the better the heat resistance and the smaller the amount of heat generated. .

(3-3) Temperature of inflection point at 100 ° C. or higher of dynamic storage elastic modulus (E ′) of rubber composition A sheet having a width of 5 mm and a length of 40 mm is cut out from a slab sheet having a thickness of 2 mm. A sample was prepared. Using a spectrometer manufactured by Ueshima Seisakusho Co., Ltd., the distance between chucks is 10 mm, the initial strain is 5%, the dynamic strain is 2%, the frequency is 52 Hz, the measurement start temperature is room temperature, the temperature rise rate is 3 ° C./min, and the measurement end temperature is 250. The dynamic storage elastic modulus (E ′) was measured under the measurement condition of ° C., and the temperature at the inflection point was read.

(3-4) Abrasion Resistance of Rubber Composition A test piece was prepared by vulcanizing a rubber piece having a diameter of 49.0 mm and a thickness of 5.0 mm prepared from an unvulcanized rubber composition at 135 ° C. for 60 minutes. .
The amount of wear of the test piece was tested at 220 ° C. by a Lambourne wear test in accordance with JIS K 6264-1993, and then calculated according to the following formula.
Abrasion resistance index = (Abrasion amount of Comparative Example 1 / Amount of test piece wear) × 100
The larger the wear resistance index, the better the wear resistance.
“Tested at 220 ° C.” means that the test was performed under the following conditions where the maximum surface temperature of the test piece was 220 ± 10 ° C.
Specimen size: Diameter x thickness = 49.0 mm x 5.0 mm
Test piece rotation speed: 200 rpm
Test road rotation speed: 20rpm
Test load: 7kgf
Test time: 16 seconds Ambient temperature: 60 ° C

(4-1) Tire Overload Drum Durability Tire size: 50 × 20.0R22 32PR aircraft radial tire in which the rubber composition according to each example and comparative example was applied to a tread rubber was tested. Carried out. Specifically, a rim assembly in which a radial tire for aircraft of 50 × 20.0R22 32PR is assembled to a rim is run for 366 seconds at a speed of 48.3 km / h under a load of 508 kN on the drum. After stopping for 2 seconds, the test was carried out under the condition of accelerating at a speed of 0 km / h to 1.5727 m / s ² and taking off at 105.06 m / s to evaluate whether or not a failure occurred in the tread.

(4-2) Tire Chipping Resistance After the above-described overload drum durability test, the presence or absence of chipping was visually evaluated.

* 1 RSS # 3
* 2 "IR2200" manufactured by JSR

* 3 Polybutadiene rubber used: “UBEPOL-150L” manufactured by Ube Industries

* 4 Carbon black used in Examples 1 to 4 and Comparative Examples 1 to 4 and 6: “Asahi AX-015” manufactured by Asahi Carbon
Carbon black used in Examples 5 and 6: “Seast 9H” manufactured by Tokai Carbon
Carbon black used in Comparative Example 5: “Asahi # 78” manufactured by Asahi Carbon
Carbon black used in Comparative Example 7: “Asahi F-200” manufactured by Asahi Carbon

* 6 Each rubber composition contains the following compounding agents as other components.
-Stearic acid: 3.0 parts by mass-Zinc flower: 5.0 parts by mass-Anti-aging agent 6C, "Nocrack 6C" manufactured by Ouchi Shinsei Chemical Co., Ltd., N- (1,3-dimethylbutyl) -N '-Phenyl-p-phenylenediamine: 2.0 parts by mass-Vulcanization accelerator CZ, "Noxeller CZ" manufactured by Ouchi Shinsei Chemical Co., Ltd., N-cyclohexyl-2-benzothiazylsulfenamide: 1. 5 parts by mass-Sulfur: 1.5 parts by mass

  From Table 1, the tread rubber of the example according to the present invention has a sufficient improvement in wear resistance while maintaining sufficient chevron cut resistance and heat resistance, and also includes the tread rubber. It can be seen that the tire of No. 1 has good durability and chipping resistance in a high severity region.

  On the other hand, in the tread rubber of Comparative Example 1, the inflection point of the dynamic storage elastic modulus (E ′) at 100 ° C. or more was less than 170 ° C. Therefore, the tire using the tread rubber of Comparative Example 1 had poor wear resistance.

1 Bead part 2 Side part 3 Tread part 4 Bead core 5 Carcass 5a, 5b Part of carcass 6 Belt

Claims (11)

  The inflection point at 100 ° C. or higher of the dynamic storage elastic modulus (E ′) measured at 2% strain is composed of a rubber composition in which 40 to 90% by mass of the rubber component is natural rubber and / or polyisoprene rubber. A tire comprising tread rubber having a temperature of 170 ° C. or higher in a tread portion.   The tire according to claim 1, wherein the rubber composition contains carbon black. The tire according to claim 2, wherein the carbon black has a nitrogen adsorption method specific surface area (N ₂ SA) of 140 to 200 m ² / g. The tire according to claim 3, wherein the carbon black has a nitrogen adsorption specific surface area (N ₂ SA) of 140 to 160 m ² / g.   The tire according to any one of claims 2 to 4, wherein the carbon black has a dibutyl phthalate (DBP) oil absorption of 120 to 200 mL / 100 g.   The tire according to claim 5, wherein the carbon black has a dibutyl phthalate (DBP) oil absorption of 130 to 160 mL / 100 g.   The tire according to any one of claims 2 to 6, wherein the rubber composition is formed by blending 40 to 60 parts by mass of the carbon black with respect to 100 parts by mass of the rubber component. The rubber component of the rubber composition further comprises a polybutadiene rubber having a cis-1,4-bond content of 95% or more and a weight average molecular weight of 3 × 10 ^{5 to} 20 × 10 ^5. The tire according to any one of 1 to 7. (A-5) to (A + 15) out of the total amount of the carbon black contained in the rubber composition when the content of the polybutadiene rubber and the content of the polybutadiene rubber in the rubber component of the rubber composition is A mass%. ) Preliminarily kneaded with mass% of carbon black, and the natural rubber and / or isoprene rubber, and carbon black contained in the preliminarily kneaded product from the total amount of the carbon black contained in the rubber composition A material containing a pre-kneaded material previously kneaded with an amount of carbon black,
The tire according to claim 8, wherein tread rubber formed by kneading is provided in a tread portion.   The tire according to any one of claims 1 to 9, wherein the tire is a tire for high speed and high load. The tire according to claim 10, wherein the tire is an aircraft tire.

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