WO2013121778A1 - Rubber composition for pneumatic-tire sidewalls, and pneumatic tire - Google Patents

Rubber composition for pneumatic-tire sidewalls, and pneumatic tire Download PDF

Info

Publication number
WO2013121778A1
WO2013121778A1 PCT/JP2013/000775 JP2013000775W WO2013121778A1 WO 2013121778 A1 WO2013121778 A1 WO 2013121778A1 JP 2013000775 W JP2013000775 W JP 2013000775W WO 2013121778 A1 WO2013121778 A1 WO 2013121778A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber composition
tire
pneumatic tire
rubber
pneumatic
Prior art date
Application number
PCT/JP2013/000775
Other languages
French (fr)
Japanese (ja)
Inventor
正起 ▲柳▼岡
Original Assignee
株式会社ブリヂストン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2013121778A1 publication Critical patent/WO2013121778A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0025—Compositions of the sidewalls
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • C08K7/26—Silicon- containing compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
    • B60C2013/005—Physical properties of the sidewall rubber
    • B60C2013/007—Thickness
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/005—Additives being defined by their particle size in general

Definitions

  • the present invention relates to a rubber composition for a sidewall of a pneumatic tire and a pneumatic tire using the same, and in particular, a rubber composition capable of improving the cut resistance of the sidewall portion of the pneumatic tire, and
  • the present invention relates to a pneumatic tire using the rubber composition in a sidewall portion.
  • the crown portion of the outer skin of the tire is protected by providing a particularly thick tread rubber or belt, but the side wall portion has no such protective member, and air leaks due to cut damage. It is known that the possibility is high. Although various attempts have been made in the past as measures for preventing cut damage and air leakage caused by the damage, none of them has achieved satisfactory results.
  • Japanese Patent Application Laid-Open No. 47-651 discloses resistance to penetration and cutting by providing a reinforcing cord layer made of a fiber material outside a carcass layer in a tire sidewall. It is disclosed that the increase of However, such measures can increase the effect to some extent against the occurrence of cut damage itself, but once cut damage has occurred, the progress of the damage growth cannot be suppressed, There is a problem that separation tends to occur from the end of the reinforcing cord layer.
  • Japanese Examined Patent Publication No. SHO 45-40383 compensates for the property of being easily damaged by the side wall by arranging a thick rubber layer inside the carcass layer in the side wall of the tire. It is disclosed that it could be reinforced. However, although such measures are expected to extend the time to air leakage when cut damage occurs, the progress of cut damage growth cannot be fundamentally suppressed, and air leakage is prevented. Suppressing performance is not sufficient. Furthermore, if the rubber layer is made thicker, the amount of rubber increases, the amount of heat generation also increases, the distortion of the bead portion and the end of the belt layer increases, and as a result, the durability of the tire decreases, In addition, there are problems such as increased production due to difficulty in manufacturing.
  • Japanese Patent Application Laid-Open No. 2001-28830 provides a rubber composition that can suppress the growth of cracks by blending a rubber component containing transpolybutadiene and short fibers made of a thermoplastic resin. It is disclosed.
  • a method for improving the durability of the rubber composition against continuous bending For example, the cut resistance of the rubber composition against a single impact assumed by a curb rubbing of a tire or the like. Does not teach or suggest, and there is room for improvement in terms of improving the cut resistance.
  • the thickness of the sidewall portion varies depending on the cross-sectional height of the tire, but by using a lightweight rubber composition, reducing the thickness of the sidewall portion at the position having the maximum width can save fuel. Is at least important to achieve.
  • JP 47-651 A Japanese Examined Patent Publication No. 45-40383 Japanese Patent Laid-Open No. 2001-28830
  • the object of the present invention is to advantageously suppress the growth of such scratches that progress toward the inner surface of the tire even after the sidewall portion has undergone cut damage.
  • An object of the present invention is to provide a rubber composition for a sidewall that can provide a pneumatic tire having a high cut resistance, and a pneumatic tire including a sidewall portion having a high cut resistance.
  • a rubber composition containing hollow fine particles in a predetermined embodiment has high cut resistance, and the rubber composition is used for a pneumatic tire.
  • a highly cut-resistant pneumatic tire is obtained in which the growth of such scratches progressing toward the tire inner surface is advantageously suppressed even after the sidewall portion is cut damaged.
  • the present invention has been completed.
  • the rubber composition for a sidewall of a pneumatic tire of the present invention contains hollow fine particles, and the hollow fine particles are present in the rubber composition at a ratio of 3% by volume to 30% by volume,
  • the frequent particle size (M) is 1 ⁇ m or more and 100 ⁇ m or less
  • the particle size distribution index (PDI) is 1.70 or less.
  • the hollow fine particles contain glass as a main component. Since hollow fine particles mainly composed of glass have a relatively high compressive strength, they are present in the rubber composition or on the surface of the rubber composition in an unbreakable state even after being mixed with the rubber component and kneaded. This can improve the cut resistance.
  • the “main component” refers to a component having the highest content in the substance.
  • the abundance ratio (volume%), mode particle diameter (M), and particle size distribution index (PDI) of the hollow fine particles described above are intended for the rubber composition applied to the sidewall portion of the completed tire. Note that it was measured.
  • the pneumatic tire of the present invention is characterized in that the rubber composition of the pneumatic tire is used for a sidewall portion.
  • the rubber composition of the pneumatic tire is used for a sidewall portion.
  • the thickness of the side rubber using the rubber composition of the present invention in the thickest part of the sidewall part is the same part from the viewpoint of both improvement of cut resistance and fuel saving. Is preferably smaller than the sum of the thicknesses of the inner liner and the carcass ply.
  • ADVANTAGE OF THE INVENTION for a sidewall that can provide a pneumatic tire with high cut resistance, in which the growth of such scratches that progress toward the inner surface of the tire is advantageously suppressed even after the sidewall portion has undergone cut damage.
  • a pneumatic tire provided with a rubber composition and a sidewall portion having high cut resistance can be provided.
  • the rubber composition for a sidewall of a pneumatic tire of the present invention contains hollow fine particles, and the hollow fine particles are present in the rubber composition in a proportion of 3% by volume to 30% by volume, and are the most frequent particles.
  • the diameter (M) is 1 ⁇ m or more and 100 ⁇ m or less, and the particle size distribution index (PDI) is 1.70 or less.
  • a very uniform pore diameter is expressed in the rubber composition due to the blended hollow fine particles.
  • the tip of the protrusion comes into contact with the hollow fine particle shell in the rubber composition to give energy, but the input energy from the tip of the protrusion exceeds a certain value.
  • the hollow fine particle shell breaks.
  • the input energy from the tip of the protrusion is dissipated, and the energy applied to the rubber composition is reduced accordingly.
  • the rubber composition containing the hollow fine particles as compared to the rubber composition not containing the fine particles, continues to disperse energy due to the bursting of the hollow fine particles even after the cracks are generated. It is considered that the cut resistance is improved.
  • the proportion of the hollow fine particles needs to be 3% by volume or more and 30% by volume or less, and preferably 7.5% by volume or more and 15% by volume or less.
  • the density of the hollow microparticles is low, so that the effect of dispersing input energy derived from external substances such as hard protrusions is small, exceeding 30% by volume. This is because the breaking properties of the rubber composition are significantly reduced.
  • the mode particle diameter (M) of the hollow fine particles needs to be 1 ⁇ m or more and 100 ⁇ m or less, and more preferably 5 ⁇ m or more and 50 ⁇ m or less. If the mode particle diameter (M) of the hollow fine particles is less than 1 ⁇ m, the particle size is too small, the dispersion of energy per hollow fine particle is small, and a sufficiently high cut resistance may not be obtained. This is because if it exceeds, the breaking properties of the rubber composition may be significantly reduced.
  • a stereomicroscope VH-6300, manufactured by Keyence Corporation
  • 500 or more hollow fine particles were measured for the test rubber composition.
  • a particle size distribution diagram as shown in FIG. 1 was prepared, and the most frequent particle size in the obtained particle size distribution was defined as the most frequent particle size (M).
  • the particle size distribution index (PDI) of the hollow fine particles needs to be 1.70 or less, and more preferably 1.50 or less.
  • the particle size distribution index of the hollow fine particles exceeds 1.70, it indicates that a relatively large number of hollow fine particles are destroyed in the rubber composition during the kneading. Sex cannot be obtained.
  • the hollow fine particles satisfying the above conditions are not particularly limited, and inorganic materials or organic materials may be used, but it is particularly preferable to use hollow fine particles mainly composed of glass. Since the hollow fine particles mainly composed of glass have a relatively large compressive strength, they are contained in a rubber composition or a rubber composition in a state where they are not destroyed even when an operation such as kneading is performed after being blended with a rubber component. Can exist on the surface.
  • the hollow fine particles mainly composed of glass used in the present embodiment for example, the ratio of the mass of alkaline earth metal oxide to the mass of alkali metal oxide in the glass composition (mass of alkaline earth metal oxide / alkali metal oxide substance) In the range of 1.2 / 1 to 3.0 / 1, and at least 97% by mass of the combined mass of the alkaline earth metal oxide and the alkali metal oxide, SiO 2 is 70% by mass.
  • Glass hollow microparticles containing ⁇ 80 mass%, CaO 8 mass% to 15 mass%, Na 2 O 3 mass% to 8 mass%, and B 2 O 3 2 mass% to 6 mass% are desirable. Glass hollow microparticles can also be prepared in devices such as those described in US Pat. No. 3,230,064 or US Pat. No. 3,129,086.
  • hollow fine particles mainly composed of commercially available glass usable in the present invention for example, Scotchlite (registered trademark of Sumitomo 3M Co., Ltd.) S60 and S32 and microspheres (Matsumoto Yushi Seiyaku Pharmaceutical Co., Ltd.) can be used. (Registered trademark) F100D.
  • the rubber component that can be used in the rubber composition of the present invention includes at least one selected from natural rubber (NR) and various synthetic rubbers.
  • the synthetic rubber include polyisoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), butyl rubber (IIR), halogenated butyl rubber (Br-IIR, Cl-IIR), Examples include ethylene-propylene-diene rubber (EPDM), crosslinked polyethylene rubber, chloroprene rubber, and nitrile rubber.
  • SBR polyisoprene rubber
  • SBR styrene-butadiene copolymer rubber
  • BR polybutadiene rubber
  • IIR butyl rubber
  • Br-IIR halogenated butyl rubber
  • EPDM ethylene-propylene-diene rubber
  • These rubber components may be used individually by 1 type, and 2 or more types may be mixed and used for them.
  • the rubber composition of the present invention may contain a filler.
  • the filler include carbon black, silica, clay, talc, calcium carbonate, aluminum hydroxide and the like.
  • the type of these fillers is not particularly limited, and any of those conventionally used as fillers for rubber can be selected and used.
  • inorganic fillers such as a silica, you may use a silane coupling agent together.
  • the rubber composition of the present invention includes the rubber component, filler such as carbon black, oils such as process oil, vulcanizing agent, vulcanization accelerator, anti-aging agent, softening agent, zinc oxide, ozone.
  • a rubber compounding material usually used in the rubber industry such as a deterioration inhibitor, a colorant, a silane coupling agent, and stearic acid can be appropriately selected and blended within a range that does not impair the object of the present invention.
  • these compounding agents commercially available products can be suitably used.
  • FIG. 2 is a sectional view in the tire width direction of the pneumatic tire 1 according to one embodiment of the present invention, in which 2 is a tread portion, 3 is a sidewall portion, and 4 is a bead portion. Further, a bead core 5 is disposed in the bead portion 4, and a carcass 6 extending in a toroidal shape is provided between the bead cores 5. A bead filler 7 is disposed outside the bead core 5 in the tire radial direction.
  • An inner liner 8 is disposed along the carcass 6 on the tire inner peripheral surface of the carcass 6.
  • the rubber composition is applied to the sidewall portion 3 as a side rubber, dissipating input energy to the sidewall portion from an external substance such as a protrusion, and the sidewall portion is cut and damaged. Even after receiving, the growth of such scratches progressing toward the tire inner surface is advantageously suppressed.
  • the tire of the present invention is not particularly limited except that the rubber composition is applied to the sidewall portion, and can be manufactured by a usual method.
  • the thickness W 1 of the side rubber using the rubber composition of the present invention in the thickest portion of the sidewall portion 3 is larger than the sum W 2 of the thicknesses of the inner liner 8 and the carcass 6 in the same portion.
  • a small size is preferable (see FIG. 2). By satisfying such requirements, it is possible to reduce the fuel consumption of the tire while having high cut resistance.
  • the test tire is assembled to the rim of size 14-5.5J on the left rear wheel of a 2-liter passenger car, the internal pressure is 150 kPa, the load mass is the driver + 60 kg, and the speed is 50 to 80 m / h.
  • the speed at which a cut occurs when the vehicle travels over a 60 mm protrusion installed on the road surface is evaluated as an index.
  • the index values in the table are those obtained by using the value of Comparative Example Tire 1 as a control, and the larger the value, the better the cut resistance.

Abstract

Provided are: a rubber composition for sidewalls that is capable of providing a highly cut-resistant pneumatic tire in which, even after a sidewall part is cut and damaged, the expansion of said damage, which progresses toward the inner surface of the tire, is prevented advantageously; and a pneumatic tire comprising highly cut-resistant sidewall parts. This rubber composition for pneumatic-tire sidewalls comprises hollow particles, the rubber composition for pneumatic-tire sidewalls being characterized in that: the proportion of the hollow particles in the rubber composition is from 3 vol% to 30 vol% inclusive; the modal particle diameter of the hollow particles is from 1 µm to 100 µm inclusive; and the particle size distribution index of the hollow particles is below or equal to 1.70. Also disclosed is a pneumatic tire in which said rubber composition is employed for the sidewall parts thereof.

Description

空気入りタイヤのサイドウォール用ゴム組成物及び空気入りタイヤRubber composition for sidewall of pneumatic tire and pneumatic tire
　本発明は、空気入りタイヤのサイドウォール用ゴム組成物及びそれを用いた空気入りタイヤに関し、特には、空気入りタイヤのサイドウォール部の耐カット性を向上させることが可能なゴム組成物、及び該ゴム組成物をサイドウォール部に用いた空気入りタイヤに関する。 The present invention relates to a rubber composition for a sidewall of a pneumatic tire and a pneumatic tire using the same, and in particular, a rubber composition capable of improving the cut resistance of the sidewall portion of the pneumatic tire, and The present invention relates to a pneumatic tire using the rubber composition in a sidewall portion.
　一般に、タイヤの外皮のうち、クラウン部は特に厚いトレッドゴムやベルトを具えることにより保護されているが、サイドウォール部はそのような保護部材がなく、カット損傷を受けることにより空気洩れに至る可能性が高いことが知られている。カット損傷及びそれによる空気洩れの防止対策として、従来様々な試みがなされてきているものの、いずれも満足する結果を得ることができていない。 In general, the crown portion of the outer skin of the tire is protected by providing a particularly thick tread rubber or belt, but the side wall portion has no such protective member, and air leaks due to cut damage. It is known that the possibility is high. Although various attempts have been made in the past as measures for preventing cut damage and air leakage caused by the damage, none of them has achieved satisfactory results.
　それらの試みのうちの第一の例として、特開昭４７－６５１号公報は、タイヤのサイドウォール部におけるカーカス層の外側に繊維材質の補強コード層を設けることにより、貫通や切断に対する抵抗性の増加を達成できたことを開示している。しかしながら、かかる対策では、カット損傷が発生すること自体に対してはある程度の効果を上げることができるものの、一旦カット損傷が発生した場合には、その損傷の成長進行を抑制することができない上、補強コード層の端部からセパレーションが発生し易いという問題がある。 As a first example of these attempts, Japanese Patent Application Laid-Open No. 47-651 discloses resistance to penetration and cutting by providing a reinforcing cord layer made of a fiber material outside a carcass layer in a tire sidewall. It is disclosed that the increase of However, such measures can increase the effect to some extent against the occurrence of cut damage itself, but once cut damage has occurred, the progress of the damage growth cannot be suppressed, There is a problem that separation tends to occur from the end of the reinforcing cord layer.
　次に、第二の例として、特公昭４５－４０４８３号公報は、タイヤのサイドウォール部におけるカーカス層の内側に厚いゴム層を配置することにより、サイドウォール部の外傷を受けやすい性質を補償及び補強できたことを開示している。しかしながら、かかる対策では、カット損傷を受けた場合に空気洩れに至るまでの時間が延長されることは予想されるものの、カット損傷の成長進行を根本的に抑制することはできず、空気洩れを抑制する性能が十分であるとはいえない。さらには、ゴム層を厚くすれば、ゴム量が増大することにより発熱量も増大し、ビード部及びベルト層の端部の歪が増加し、結果的にタイヤの耐久力が低下することとなり、加えて製造が困難なためにコストアップにもつながる等の問題がある。 Next, as a second example, Japanese Examined Patent Publication No. SHO 45-40383 compensates for the property of being easily damaged by the side wall by arranging a thick rubber layer inside the carcass layer in the side wall of the tire. It is disclosed that it could be reinforced. However, although such measures are expected to extend the time to air leakage when cut damage occurs, the progress of cut damage growth cannot be fundamentally suppressed, and air leakage is prevented. Suppressing performance is not sufficient. Furthermore, if the rubber layer is made thicker, the amount of rubber increases, the amount of heat generation also increases, the distortion of the bead portion and the end of the belt layer increases, and as a result, the durability of the tire decreases, In addition, there are problems such as increased production due to difficulty in manufacturing.
　更に、第三の例として、特開２００１－２８８３０号公報は、トランスポリブタジエンを含むゴム成分と熱可塑性樹脂からなる短繊維とを配合することにより、亀裂の成長を抑制できるゴム組成物が得られることを開示している。しかしながら、かかる方法は、連続的な屈曲に対するゴム組成物の耐久性を向上させるための方法であり、例えばタイヤの縁石こすれ等により想定される、単発的な衝撃に対するゴム組成物の耐カット性については教示も示唆もしておらず、該耐カット性の向上に関して改善の余地がある。 Furthermore, as a third example, Japanese Patent Application Laid-Open No. 2001-28830 provides a rubber composition that can suppress the growth of cracks by blending a rubber component containing transpolybutadiene and short fibers made of a thermoplastic resin. It is disclosed. However, such a method is a method for improving the durability of the rubber composition against continuous bending. For example, the cut resistance of the rubber composition against a single impact assumed by a curb rubbing of a tire or the like. Does not teach or suggest, and there is room for improvement in terms of improving the cut resistance.
　さらに、近年は、タイヤの省燃費化を達成する目的で、サイドウォール部のゴムの厚み自体を薄くして軽量化する必要性があるため、サイドウォール部の耐カット性をより一層向上させることが課題となっている。一般に、サイドウォール部の厚みは、タイヤの断面高さによって異なるが、軽量化したゴム組成物を用いることで、最大幅を有する位置でのサイドウォール部の厚みを低減することが、省燃費化を達成するためには少なくとも重要である。 Furthermore, in recent years, it has been necessary to reduce the weight of the sidewall rubber to reduce the weight for the purpose of achieving fuel savings in the tires, so that the cut resistance of the sidewall portion can be further improved. Has become an issue. In general, the thickness of the sidewall portion varies depending on the cross-sectional height of the tire, but by using a lightweight rubber composition, reducing the thickness of the sidewall portion at the position having the maximum width can save fuel. Is at least important to achieve.
特開昭４７－６５１号公報JP 47-651 A 特公昭４５－４０４８３号公報Japanese Examined Patent Publication No. 45-40383 特開２００１－２８８３０号公報Japanese Patent Laid-Open No. 2001-28830
　そこで、本発明の目的は、上述した従来技術の様々な問題点に鑑み、サイドウォール部がカット損傷を受けた後も、タイヤ内面に向かって進行するかかる傷の成長が有利に抑制される、耐カット性の高い空気入りタイヤを提供できるサイドウォール用ゴム組成物、及び、耐カット性の高いサイドウォール部を備える空気入りタイヤを提供することにある。 Therefore, in view of the various problems of the prior art described above, the object of the present invention is to advantageously suppress the growth of such scratches that progress toward the inner surface of the tire even after the sidewall portion has undergone cut damage. An object of the present invention is to provide a rubber composition for a sidewall that can provide a pneumatic tire having a high cut resistance, and a pneumatic tire including a sidewall portion having a high cut resistance.
　本発明者は、上記目的を達成するために鋭意検討した結果、所定の態様で中空微粒子を含有するゴム組成物は耐カット性が高いことを見出し、また、該ゴム組成物を空気入りタイヤのサイドウォール部に適用することで、サイドウォール部がカット損傷を受けた後も、タイヤ内面に向かって進行するかかる傷の成長が有利に抑制される、耐カット性の高い空気入りタイヤが得られることを見出し、本発明を完成させるに至った。 As a result of intensive studies to achieve the above object, the present inventor has found that a rubber composition containing hollow fine particles in a predetermined embodiment has high cut resistance, and the rubber composition is used for a pneumatic tire. By applying to the sidewall portion, a highly cut-resistant pneumatic tire is obtained in which the growth of such scratches progressing toward the tire inner surface is advantageously suppressed even after the sidewall portion is cut damaged. As a result, the present invention has been completed.
　即ち、本発明の空気入りタイヤのサイドウォール用ゴム組成物は、中空微粒子を含有し、該中空微粒子は、該ゴム組成物中において、３体積％以上３０体積％以下の割合で存在し、最頻粒子径（Ｍ）が１μｍ以上１００μｍ以下であり、粒度分布ｉｎｄｅｘ（ＰＤＩ）が１．７０以下であることを特徴とする。上記要件を具備することにより、耐カット性の高い空気入りタイヤのサイドウォール用ゴム組成物が得られる。
　ここで、「最頻粒子径（Ｍ）」とは、後述する粒度分布における最頻の粒子径（モード径）を指し、「粒度分布ｉｎｄｅｘ（ＰＤＩ）」とは、後述の通り、粒度分布における半値幅（ＦＷＨＭ）を最頻粒子径（Ｍ）で除した値を指す。 That is, the rubber composition for a sidewall of a pneumatic tire of the present invention contains hollow fine particles, and the hollow fine particles are present in the rubber composition at a ratio of 3% by volume to 30% by volume, The frequent particle size (M) is 1 μm or more and 100 μm or less, and the particle size distribution index (PDI) is 1.70 or less. By satisfying the above requirements, a rubber composition for a sidewall of a pneumatic tire having high cut resistance can be obtained.
Here, “mode particle size (M)” refers to the mode particle size (mode diameter) in the particle size distribution described later, and “particle size distribution index (PDI)” refers to the particle size distribution in the particle size distribution as described later. It refers to the value obtained by dividing the full width at half maximum (FWHM) by the mode particle size (M).
　本発明の空気入りタイヤのサイドウォール用ゴム組成物の好適例においては、前記中空微粒子はガラスを主成分とする。ガラスを主成分とする中空微粒子は圧縮強度が比較的大きいので、ゴム成分に配合し、混練等の操作が行われた後でも、破壊されない状態でゴム組成物中あるいはゴム組成物の表面に存在することができ、耐カット性をより高めることができる。
　ここで、「主成分」とは、その物質中において含有率が最も高い成分を指す。 In a preferred example of the rubber composition for a sidewall of a pneumatic tire according to the present invention, the hollow fine particles contain glass as a main component. Since hollow fine particles mainly composed of glass have a relatively high compressive strength, they are present in the rubber composition or on the surface of the rubber composition in an unbreakable state even after being mixed with the rubber component and kneaded. This can improve the cut resistance.
Here, the “main component” refers to a component having the highest content in the substance.
　なお、本発明において、上記の中空微粒子の存在割合（体積％）、最頻粒子径（Ｍ）及び粒径分布ｉｎｄｅｘ（ＰＤＩ）は、完成したタイヤのサイドウォール部にかかるゴム組成物を対象として測定したものであることに留意されたい。 In the present invention, the abundance ratio (volume%), mode particle diameter (M), and particle size distribution index (PDI) of the hollow fine particles described above are intended for the rubber composition applied to the sidewall portion of the completed tire. Note that it was measured.
　また、本発明の空気入りタイヤは、上記空気入りタイヤのゴム組成物をサイドウォール部に用いたことを特徴とする。上記ゴム組成物をサイドゴムとして用いることにより、耐カット性の高いサイドウォール部を備える空気入りタイヤを提供することができる。 Further, the pneumatic tire of the present invention is characterized in that the rubber composition of the pneumatic tire is used for a sidewall portion. By using the rubber composition as a side rubber, it is possible to provide a pneumatic tire including a sidewall portion having high cut resistance.
　さらに、本発明の空気入りタイヤは、耐カット性の向上と省燃費化の両立の観点から、サイドウォール部の最厚部分における本発明のゴム組成物を用いたサイドゴムの厚さが、同部分におけるインナーライナーとカーカスプライの厚さの和よりも小さいことが好ましい。 Further, in the pneumatic tire of the present invention, the thickness of the side rubber using the rubber composition of the present invention in the thickest part of the sidewall part is the same part from the viewpoint of both improvement of cut resistance and fuel saving. Is preferably smaller than the sum of the thicknesses of the inner liner and the carcass ply.
　本発明によれば、サイドウォール部がカット損傷を受けた後も、タイヤ内面に向かって進行するかかる傷の成長が有利に抑制される、耐カット性の高い空気入りタイヤを提供できるサイドウォール用ゴム組成物、及び、耐カット性の高いサイドウォール部を備える空気入りタイヤを提供することができる。 ADVANTAGE OF THE INVENTION According to the present invention, for a sidewall that can provide a pneumatic tire with high cut resistance, in which the growth of such scratches that progress toward the inner surface of the tire is advantageously suppressed even after the sidewall portion has undergone cut damage. A pneumatic tire provided with a rubber composition and a sidewall portion having high cut resistance can be provided.
ゴム組成物中における中空微粒子の最頻粒子径（Ｍ）及び粒度分布ｉｎｄｅｘ（ＰＤＩ）の算出方法を説明するための概念図である。It is a conceptual diagram for demonstrating the calculation method of the mode particle diameter (M) and particle size distribution index (PDI) of the hollow microparticles in a rubber composition. 本発明の一実施態様における空気入りタイヤのタイヤ幅方向断面図である。It is a tire width direction sectional view of the pneumatic tire in one embodiment of the present invention.
　以下に、本発明を詳細に説明する。本発明の空気入りタイヤのサイドウォール用ゴム組成物は、中空微粒子を含有し、該中空微粒子は、該ゴム組成物中において、３体積％以上３０体積％以下の割合で存在し、最頻粒子径（Ｍ）が１μｍ以上１００μｍ以下であり、粒度分布ｉｎｄｅｘ（ＰＤＩ）が１．７０以下であることを特徴とする。 Hereinafter, the present invention will be described in detail. The rubber composition for a sidewall of a pneumatic tire of the present invention contains hollow fine particles, and the hollow fine particles are present in the rubber composition in a proportion of 3% by volume to 30% by volume, and are the most frequent particles. The diameter (M) is 1 μm or more and 100 μm or less, and the particle size distribution index (PDI) is 1.70 or less.
　本発明のゴム組成物においては、配合した上記中空微粒子により、ゴム組成物内で極めて均一な細孔径が発現する。このゴム組成物に硬い突起物が突き刺さると、突起物の先端はゴム組成物中の中空微粒子の殻に接触してエネルギーを付与するが、突起物の先端からの入力エネルギーがある値以上になったとき、中空微粒子の殻は割れる。この現象によって、突起物の先端からの入力エネルギーが散逸され、その分ゴム組成物へ付与されるエネルギーが低減される。つまり、中空微粒子を配合したゴム組成物は、配合していないゴム組成物に比べ、亀裂が発生した後においても、中空微粒子の破裂によるエネルギー分散が継続して行われるため、亀裂の進行成長が緩和され、耐カット性が向上すると考えられる。 In the rubber composition of the present invention, a very uniform pore diameter is expressed in the rubber composition due to the blended hollow fine particles. When a hard protrusion is pierced into this rubber composition, the tip of the protrusion comes into contact with the hollow fine particle shell in the rubber composition to give energy, but the input energy from the tip of the protrusion exceeds a certain value. The hollow fine particle shell breaks. By this phenomenon, the input energy from the tip of the protrusion is dissipated, and the energy applied to the rubber composition is reduced accordingly. In other words, the rubber composition containing the hollow fine particles, as compared to the rubber composition not containing the fine particles, continues to disperse energy due to the bursting of the hollow fine particles even after the cracks are generated. It is considered that the cut resistance is improved.
　本発明のゴム組成物中において、前記中空微粒子の存在割合は、３体積％以上３０体積％以下であることが必要であり、７．５体積％以上１５体積％以下であることが好ましい。ゴム組成物中における前記中空微粒子の存在割合が３体積％未満では、中空微粒子の密度が低いため、硬い突起物等の外的物質に由来する入力エネルギーの分散効果が小さく、３０体積％を超えると、ゴム組成物の破断特性が著しく低下するためである。 In the rubber composition of the present invention, the proportion of the hollow fine particles needs to be 3% by volume or more and 30% by volume or less, and preferably 7.5% by volume or more and 15% by volume or less. When the hollow microparticles present in the rubber composition is less than 3% by volume, the density of the hollow microparticles is low, so that the effect of dispersing input energy derived from external substances such as hard protrusions is small, exceeding 30% by volume. This is because the breaking properties of the rubber composition are significantly reduced.
　また、本発明のゴム組成物において、前記中空微粒子の最頻粒子径（Ｍ）は、１μｍ以上１００μｍ以下であることが必要であり、５μｍ以上５０μｍ以下であることがより好ましい。前記中空微粒子の最頻粒子径（Ｍ）が１μｍ未満では、粒子径が小さすぎて中空微粒子１個あたりのエネルギーの分散が小さく、十分に高い耐カット性が得られない場合があり、１００μｍを超えると、ゴム組成物の破断特性が著しく低下するおそれがあるためである。なお、最頻粒子径（Ｍ）を算出するにあたっては、倍率１００倍～４００倍の実体顕微鏡（キーエンス社製、ＶＨ－６３００）を用い、試験ゴム組成物に対して５００個以上の中空微粒子の直径を測定することにより図１に示すような粒度分布図を作成し、ここで得られた粒度分布における最頻の粒子径を最頻粒子径（Ｍ）とした。 In the rubber composition of the present invention, the mode particle diameter (M) of the hollow fine particles needs to be 1 μm or more and 100 μm or less, and more preferably 5 μm or more and 50 μm or less. If the mode particle diameter (M) of the hollow fine particles is less than 1 μm, the particle size is too small, the dispersion of energy per hollow fine particle is small, and a sufficiently high cut resistance may not be obtained. This is because if it exceeds, the breaking properties of the rubber composition may be significantly reduced. In calculating the mode particle diameter (M), a stereomicroscope (VH-6300, manufactured by Keyence Corporation) with a magnification of 100 to 400 times was used, and 500 or more hollow fine particles were measured for the test rubber composition. By measuring the diameter, a particle size distribution diagram as shown in FIG. 1 was prepared, and the most frequent particle size in the obtained particle size distribution was defined as the most frequent particle size (M).
　また、本発明のゴム組成物において、前記中空微粒子の粒度分布ｉｎｄｅｘ（ＰＤＩ）は１．７０以下であることが必要であり、１．５０以下であることがより好ましい。前記中空微粒子の粒度分布ｉｎｄｅｘが１．７０を超えている場合、それは混練時にゴム組成物中で比較的多くの中空微粒子が破壊されていることを示し、従って、この場合には十分高い耐カット性が得られない。ここで、粒度分布ｉｎｄｅｘは、図１に示す通り、上述により求めた粒度分布の半値幅（ＦＷＨＭ）と最頻粒子径（Ｍ）を用い、下式（１）から算出される値である。
　　ＰＤＩ＝（ＦＷＨＭ）／（Ｍ）　・・・式（１） In the rubber composition of the present invention, the particle size distribution index (PDI) of the hollow fine particles needs to be 1.70 or less, and more preferably 1.50 or less. When the particle size distribution index of the hollow fine particles exceeds 1.70, it indicates that a relatively large number of hollow fine particles are destroyed in the rubber composition during the kneading. Sex cannot be obtained. Here, the particle size distribution index is a value calculated from the following equation (1) using the half-value width (FWHM) and the mode particle size (M) of the particle size distribution obtained as described above, as shown in FIG.
PDI = (FWHM) / (M) (1)
　前記各条件を満たす中空微粒子としては、特に制限はされず、無機系材料または有機系材料を用いてもよいが、特にガラスを主成分とする中空微粒子を用いることが好ましい。前記ガラスを主成分とする中空微粒子は、比較的大きな圧縮強度を有するので、ゴム成分に配合された後、混練等の操作が行われた場合でも破壊されない状態でゴム組成物中あるいはゴム組成物の表面に存在することができる。本実施形態に用いるガラスを主成分とする中空微粒子としては、例えば、ガラス組成におけるアルカリ金属酸化物質量に対するアルカリ土類金属酸化物の質量の比（アルカリ土類金属酸化物質量／アルカリ金属酸化物質量）を１．２／１～３．０／１の範囲としたものが好ましく、アルカリ土類金属酸化物及びアルカリ金属酸化物の合わせた質量の少なくとも９７質量％において、ＳｉＯ２が７０質量％～８０質量％、ＣａＯが８質量％～１５質量％、Ｎａ２Ｏが３質量％～８質量％、及びＢ２Ｏ３が２質量％～６質量％含まれるガラス製中空微粒子が望ましい。また、ガラス製中空微粒子は、米国特許第３，２３０，０６４号明細書または米国特許第３，１２９，０８６号明細書に記載されるものなどの装置において調製することができる。 The hollow fine particles satisfying the above conditions are not particularly limited, and inorganic materials or organic materials may be used, but it is particularly preferable to use hollow fine particles mainly composed of glass. Since the hollow fine particles mainly composed of glass have a relatively large compressive strength, they are contained in a rubber composition or a rubber composition in a state where they are not destroyed even when an operation such as kneading is performed after being blended with a rubber component. Can exist on the surface. As the hollow fine particles mainly composed of glass used in the present embodiment, for example, the ratio of the mass of alkaline earth metal oxide to the mass of alkali metal oxide in the glass composition (mass of alkaline earth metal oxide / alkali metal oxide substance) In the range of 1.2 / 1 to 3.0 / 1, and at least 97% by mass of the combined mass of the alkaline earth metal oxide and the alkali metal oxide, SiO 2 is 70% by mass. Glass hollow microparticles containing ˜80 mass%, CaO 8 mass% to 15 mass%, Na 2 O 3 mass% to 8 mass%, and B 2 O 3 2 mass% to 6 mass% are desirable. Glass hollow microparticles can also be prepared in devices such as those described in US Pat. No. 3,230,064 or US Pat. No. 3,129,086.
　本発明に使用可能な市販のガラスを主成分とする中空微粒子としては、強度の高い種類のものとして、例えばスコッチライト（住友スリーエム（株）登録商標）Ｓ６０及びＳ３２、並びにマイクロスフェア（松本油脂製薬（株）登録商標） Ｆ１００Ｄを挙げることができる。 As the hollow fine particles mainly composed of commercially available glass usable in the present invention, for example, Scotchlite (registered trademark of Sumitomo 3M Co., Ltd.) S60 and S32 and microspheres (Matsumoto Yushi Seiyaku Pharmaceutical Co., Ltd.) can be used. (Registered trademark) F100D.
　本発明のゴム組成物に使用可能なゴム成分としては、天然ゴム（ＮＲ）及び種々の合成ゴムから選択される少なくとも一種が挙げられる。上記合成ゴムの具体例としては、ポリイソプレンゴム（ＩＲ）、スチレン－ブタジエン共重合ゴム（ＳＢＲ）、ポリブタジエンゴム（ＢＲ）、ブチルゴム（ＩＩＲ）、ハロゲン化ブチルゴム（Ｂｒ－ＩＩＲ、Ｃｌ－ＩＩＲ）、エチレン－プロピレン－ジエンゴム（ＥＰＤＭ）、架橋ポリエチレンゴム、クロロプレンゴム及びニトリルゴム等が挙げられる。これらのゴム成分は、一種単独で用いても良いし、二種以上を混合して用いてもよい。 The rubber component that can be used in the rubber composition of the present invention includes at least one selected from natural rubber (NR) and various synthetic rubbers. Specific examples of the synthetic rubber include polyisoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), butyl rubber (IIR), halogenated butyl rubber (Br-IIR, Cl-IIR), Examples include ethylene-propylene-diene rubber (EPDM), crosslinked polyethylene rubber, chloroprene rubber, and nitrile rubber. These rubber components may be used individually by 1 type, and 2 or more types may be mixed and used for them.
　本発明のゴム組成物は、充填剤を含んでもよい。該充填剤としては、カーボンブラック、シリカ、クレー、タルク、炭酸カルシウム、水酸化アルミニウム等を挙げることができる。これら充填剤の種類としては特に制限されず、従来ゴムの充填剤として慣用されているものの中から任意のものを選択して用いることができる。また、シリカ等の無機充填剤を用いる場合には、シランカップリング剤を併用してもよい。 The rubber composition of the present invention may contain a filler. Examples of the filler include carbon black, silica, clay, talc, calcium carbonate, aluminum hydroxide and the like. The type of these fillers is not particularly limited, and any of those conventionally used as fillers for rubber can be selected and used. Moreover, when using inorganic fillers, such as a silica, you may use a silane coupling agent together.
　さらに、本発明のゴム組成物には、前記ゴム成分、カーボンブラック等の充填剤の他、プロセスオイル等の油分、加硫剤、加硫促進剤、老化防止剤、軟化剤、酸化亜鉛、オゾン劣化防止剤、着色剤、シランカップリング剤及びステアリン酸等のゴム業界で通常使用されるゴム用配合材料を、本発明の目的を害しない範囲内で適宜選択し配合することができる。これら配合剤は、市販品を好適に使用できる。 Further, the rubber composition of the present invention includes the rubber component, filler such as carbon black, oils such as process oil, vulcanizing agent, vulcanization accelerator, anti-aging agent, softening agent, zinc oxide, ozone. A rubber compounding material usually used in the rubber industry such as a deterioration inhibitor, a colorant, a silane coupling agent, and stearic acid can be appropriately selected and blended within a range that does not impair the object of the present invention. As these compounding agents, commercially available products can be suitably used.
　本発明の空気入りタイヤは、上記ゴム組成物をサイドウォール部に適用したことを特徴とする。以下に、図を参照しながら本発明の空気入りタイヤについて説明する。図２は、本発明の一実施態様における空気入りタイヤ１のタイヤ幅方向断面図を示し、２はトレッド部、３はサイドウォール部、４はビード部である。また、ビード部４には、ビードコア５が配設されており、このビードコア５間には、トロイダル状に延びるカーカス６が設けられており、ビードコア５のタイヤ径方向外側には、ビードフィラー７が配設されており、カーカス６のタイヤ内周面には、カーカス６に沿うようにして、インナーライナー８が配設されている。本発明の空気入りタイヤは、前記ゴム組成物をサイドゴムとしてサイドウォール部３に適用し、突起物等の外的物質からのサイドウォール部に対する入力エネルギーを散逸し、該サイドウォール部がカット損傷を受けた後も、タイヤ内面に向かって進行するかかる傷の成長が有利に抑制される。なお、本発明のタイヤは、サイドウォール部に上記ゴム組成物を適用する以外、特に制限は無く、通常の方法で製造することができる。 The pneumatic tire according to the present invention is characterized in that the rubber composition is applied to a sidewall portion. The pneumatic tire of the present invention will be described below with reference to the drawings. FIG. 2 is a sectional view in the tire width direction of the pneumatic tire 1 according to one embodiment of the present invention, in which 2 is a tread portion, 3 is a sidewall portion, and 4 is a bead portion. Further, a bead core 5 is disposed in the bead portion 4, and a carcass 6 extending in a toroidal shape is provided between the bead cores 5. A bead filler 7 is disposed outside the bead core 5 in the tire radial direction. An inner liner 8 is disposed along the carcass 6 on the tire inner peripheral surface of the carcass 6. In the pneumatic tire of the present invention, the rubber composition is applied to the sidewall portion 3 as a side rubber, dissipating input energy to the sidewall portion from an external substance such as a protrusion, and the sidewall portion is cut and damaged. Even after receiving, the growth of such scratches progressing toward the tire inner surface is advantageously suppressed. The tire of the present invention is not particularly limited except that the rubber composition is applied to the sidewall portion, and can be manufactured by a usual method.
　特に、上記構成において、サイドウォール部３の最厚部分における本発明のゴム組成物を用いたサイドゴムの厚さＷ１が、同部分におけるインナーライナー８とカーカス６の厚さの和Ｗ２よりも小さいことが好ましい（図２参照）。かかる要件を満たすことにより、高い耐カット性を有しつつタイヤの省燃費化をもたらすことができる。 In particular, in the above configuration, the thickness W 1 of the side rubber using the rubber composition of the present invention in the thickest portion of the sidewall portion 3 is larger than the sum W 2 of the thicknesses of the inner liner 8 and the carcass 6 in the same portion. A small size is preferable (see FIG. 2). By satisfying such requirements, it is possible to reduce the fuel consumption of the tire while having high cut resistance.
　以下に、実施例を挙げて本発明を更に詳しく説明するが、本発明は下記の実施例に何ら限定されるものではない。 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.
　表１の通りに成分を配合し、混練及び成型を行って、中空微粒子を配合してなるゴム組成物を調製した。次に、該ゴム組成物をサイドウォール部に適用して従来法により試験用タイヤ（サイズ：１７５／７０Ｒ１４）を試作し、下記の方法で耐カット性及び破断強度を評価した。それぞれの評価結果を表２に示す。 As shown in Table 1, the components were blended, kneaded and molded to prepare a rubber composition blended with hollow fine particles. Next, the rubber composition was applied to the sidewall portion, and a test tire (size: 175 / 70R14) was produced by a conventional method, and cut resistance and breaking strength were evaluated by the following methods. The respective evaluation results are shown in Table 2.
（１）耐カット性
排気量２リットルの乗用車の左後輪に試験タイヤをサイズ１４－５．５Ｊのリムに組み付け、内圧１５０ｋＰａ、負荷質量をドライバー＋６０ｋｇとし、速度を５０～８０ｍ／ｈで速度を変化させて走行し、路面に設置した６０ｍｍの突起を乗り越えたときにカットが発生する速度を指数評価した。表中の指数値は、比較例タイヤ１の値をコントロールとして求めたものであり、数値が大きいほど耐カット性が良好であることを示す。 (1) Cut resistance The test tire is assembled to the rim of size 14-5.5J on the left rear wheel of a 2-liter passenger car, the internal pressure is 150 kPa, the load mass is the driver + 60 kg, and the speed is 50 to 80 m / h. The speed at which a cut occurs when the vehicle travels over a 60 mm protrusion installed on the road surface is evaluated as an index. The index values in the table are those obtained by using the value of Comparative Example Tire 1 as a control, and the larger the value, the better the cut resistance.
（２）破断強度
　上記ゴム組成物から、ダンベル状３号形試験片を打ち抜き、ＪＩＳ　Ｋ６２５１：２０１０に準拠して、該ゴム組成物片の破断強度（単位：ＭＰａ）を測定し、比較例１の破断強度を１００として指数表示した。数値が大きいほど、破断強度が良好であることを表す。 (2) Breaking strength A dumbbell-shaped No. 3 test piece was punched from the rubber composition, and the breaking strength (unit: MPa) of the rubber composition piece was measured in accordance with JIS K6251: 2010. Comparative Example 1 The rupture strength was indicated as an index. The larger the value, the better the breaking strength.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　*1　宇部興産株式会社製「１５０Ｌ」
　*2　東海カーボン株式会社製「シーストＦ」
　*3　ゴム組成物中における存在割合（体積％）として、表２に示す
　*4　日本精蝋製株式会社製、マイクロクリスタリンワックス「オゾエース０７０１」
　*5　大内新興化学工業株式会社製、６ＰＰＤ「ノクラック６Ｃ」
　*6　大内新興化学工業株式会社製「ノクセラーＤ」
　*7　大内新興化学工業株式会社製「ノクセラーＤＭ」
　*8　三新化学工業株式会社製「サンセラーＣＭ－Ｇ」 * 1 "150L" manufactured by Ube Industries, Ltd.
* 2 “Seast F” manufactured by Tokai Carbon Co., Ltd.
* 3 The ratio (volume%) in the rubber composition is shown in Table 2. * 4 Microcrystalline wax “Ozoace 0701” manufactured by Nippon Seiwa Co., Ltd.
* 5 Ouchi Shinsei Chemical Co., Ltd., 6PPD “NOCRACK 6C”
* 6 “Noxeller D” manufactured by Ouchi Shinsei Chemical Co., Ltd.
* 7 "Noxeller DM" manufactured by Ouchi Shinsei Chemical Co., Ltd.
* 8 "Sunseller CM-G" manufactured by Sanshin Chemical Industry Co., Ltd.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表２から明らかなように、所定の態様で中空微粒子を含有する実施例１～５のゴム組成物は、比較例に比べて高い耐カット性を有し、また、破断強度も十分に維持されることがわかった。 As is apparent from Table 2, the rubber compositions of Examples 1 to 5 containing hollow fine particles in a predetermined manner have higher cut resistance than the comparative examples, and the breaking strength is sufficiently maintained. I found out.
　１　　空気入りタイヤ
　２　　トレッド部
　３　　サイドウォール部
　４　　ビード部
　５　　ビードコア
　６　　カーカス
　７　　ビードフィラー
　８　　インナーライナー
  DESCRIPTION OF SYMBOLS 1 Pneumatic tire 2 Tread part 3 Side wall part 4 Bead part 5 Bead core 6 Carcass 7 Bead filler 8 Inner liner

Claims (4)

  1. 　中空微粒子を含有する空気入りタイヤのサイドウォール用ゴム組成物であって、
    　該中空微粒子は、該ゴム組成物中において、
    　　３体積％以上３０体積％以下の割合で存在し、
    　　最頻粒子径が１μｍ以上１００μｍ以下であり、
    　　粒度分布ｉｎｄｅｘが１．７０以下である
    　ことを特徴とする空気入りタイヤのサイドウォール用ゴム組成物。     A rubber composition for a sidewall of a pneumatic tire containing hollow fine particles,
    The hollow fine particles are contained in the rubber composition.
    Present in a proportion of 3% to 30% by volume,
    The mode particle diameter is 1 μm or more and 100 μm or less,
    A rubber composition for a sidewall of a pneumatic tire, wherein the particle size distribution index is 1.70 or less.
  2. 　前記中空微粒子はガラスを主成分とする、請求項１に記載の空気入りタイヤのサイドウォール用ゴム組成物。 The rubber composition for a sidewall of a pneumatic tire according to claim 1, wherein the hollow fine particles are mainly composed of glass.
  3. 　請求項１または２に記載の空気入りタイヤのゴム組成物をサイドウォール部に適用した空気入りタイヤ。 A pneumatic tire in which the rubber composition for a pneumatic tire according to claim 1 or 2 is applied to a sidewall portion.
  4. 　サイドウォール部の最厚部分における本発明のゴム組成物を用いたサイドゴムの厚さが、同部分におけるインナーライナーとカーカスプライの厚さの和よりも小さいことを特徴とする請求項３に記載の空気入りタイヤ。
          The thickness of the side rubber | gum using the rubber composition of this invention in the thickest part of a sidewall part is smaller than the sum of the thickness of the inner liner and carcass ply in the said part. Pneumatic tire.
PCT/JP2013/000775 2012-02-13 2013-02-13 Rubber composition for pneumatic-tire sidewalls, and pneumatic tire WO2013121778A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012028789A JP2013163790A (en) 2012-02-13 2012-02-13 Rubber composition for sidewall of pneumatic tire, and pneumatic tire
JP2012-028789 2012-02-13

Publications (1)

Publication Number Publication Date
WO2013121778A1 true WO2013121778A1 (en) 2013-08-22

Family

ID=48983911

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/000775 WO2013121778A1 (en) 2012-02-13 2013-02-13 Rubber composition for pneumatic-tire sidewalls, and pneumatic tire

Country Status (2)

Country Link
JP (1) JP2013163790A (en)
WO (1) WO2013121778A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6180948B2 (en) * 2014-01-23 2017-08-16 横浜ゴム株式会社 Vulcanized rubber composition for tires

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04362405A (en) * 1991-06-06 1992-12-15 Sumitomo Rubber Ind Ltd Pneumatic tire
JPH07215018A (en) * 1994-02-02 1995-08-15 Sumitomo Rubber Ind Ltd Pneumatic tire
JP2002301902A (en) * 2001-04-03 2002-10-15 Ohtsu Tire & Rubber Co Ltd :The Pneumatic tire
JP2005280407A (en) * 2004-03-29 2005-10-13 Sumitomo Rubber Ind Ltd Pneumatic tire
US7406990B2 (en) * 2005-08-10 2008-08-05 The Goodyear Tire & Rubber Company Runflat tire with sidewall component containing high strength glass bubbles
JP2011046775A (en) * 2009-08-25 2011-03-10 Bridgestone Corp Rubber composition for tire tread and pneumatic tire

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04362405A (en) * 1991-06-06 1992-12-15 Sumitomo Rubber Ind Ltd Pneumatic tire
JPH07215018A (en) * 1994-02-02 1995-08-15 Sumitomo Rubber Ind Ltd Pneumatic tire
JP2002301902A (en) * 2001-04-03 2002-10-15 Ohtsu Tire & Rubber Co Ltd :The Pneumatic tire
JP2005280407A (en) * 2004-03-29 2005-10-13 Sumitomo Rubber Ind Ltd Pneumatic tire
US7406990B2 (en) * 2005-08-10 2008-08-05 The Goodyear Tire & Rubber Company Runflat tire with sidewall component containing high strength glass bubbles
JP2011046775A (en) * 2009-08-25 2011-03-10 Bridgestone Corp Rubber composition for tire tread and pneumatic tire

Also Published As

Publication number Publication date
JP2013163790A (en) 2013-08-22

Similar Documents

Publication Publication Date Title
EP2147951B1 (en) Rubber composition for tire and pneumatic tire
EP2292451B1 (en) Run-flat tire
JP5443455B2 (en) Pneumatic tire
JP5041515B2 (en) Pneumatic tire
JP2009286317A (en) Tire
JP5364259B2 (en) tire
JP6392748B2 (en) Pneumatic radial tire for passenger cars
JP5038637B2 (en) Pneumatic tire
JP2006063284A (en) Rubber composition for tire side wall and pneumatic tire
JP2000079807A (en) Steel code reinforced-pneumatic tire
JP4515484B2 (en) Run flat tire
EP2692544B1 (en) Tire casing
JP4012160B2 (en) Rubber composition for base tread and pneumatic tire
JP2010115958A (en) Pneumatic tire
WO2010137143A1 (en) Tire
WO2013121778A1 (en) Rubber composition for pneumatic-tire sidewalls, and pneumatic tire
JP4796454B2 (en) Side reinforcing rubber composition and run-flat tire using the same
JP2011005894A (en) Pneumatic tire
JP5528161B2 (en) tire
JP2005126555A (en) Rubber composition for tire sidewall reinforcing layer
JP4956810B2 (en) Run flat tire
JPS60131303A (en) Pneumatic tire
JP2008308575A (en) Rubber composition for tread and pneumatic tire using the same
JP4917348B2 (en) Pneumatic tire
EP3988333B1 (en) Pneumatic tire

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13748928

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13748928

Country of ref document: EP

Kind code of ref document: A1