JP2021014200A - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
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- JP2021014200A JP2021014200A JP2019130263A JP2019130263A JP2021014200A JP 2021014200 A JP2021014200 A JP 2021014200A JP 2019130263 A JP2019130263 A JP 2019130263A JP 2019130263 A JP2019130263 A JP 2019130263A JP 2021014200 A JP2021014200 A JP 2021014200A
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- QXQSYCPFYFZNGY-UHFFFAOYSA-N n,n-diethyl-2-trimethoxysilylethanamine Chemical compound CCN(CC)CC[Si](OC)(OC)OC QXQSYCPFYFZNGY-UHFFFAOYSA-N 0.000 description 1
- BVBBZEKOMUDXMZ-UHFFFAOYSA-N n,n-diethyl-3-triethoxysilylpropan-1-amine Chemical compound CCO[Si](OCC)(OCC)CCCN(CC)CC BVBBZEKOMUDXMZ-UHFFFAOYSA-N 0.000 description 1
- XTOSZDRAGWRSBP-UHFFFAOYSA-N n,n-dimethyl-2-triethoxysilylethanamine Chemical compound CCO[Si](OCC)(OCC)CCN(C)C XTOSZDRAGWRSBP-UHFFFAOYSA-N 0.000 description 1
- RKOBOSOXEJGFTF-UHFFFAOYSA-N n,n-dimethyl-2-trimethoxysilylethanamine Chemical compound CO[Si](OC)(OC)CCN(C)C RKOBOSOXEJGFTF-UHFFFAOYSA-N 0.000 description 1
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- DEQZTKGFXNUBJL-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)cyclohexanamine Chemical compound C1CCCCC1NSC1=NC2=CC=CC=C2S1 DEQZTKGFXNUBJL-UHFFFAOYSA-N 0.000 description 1
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- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
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- 150000002989 phenols Chemical class 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
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- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
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- 150000005691 triesters Chemical class 0.000 description 1
- FPBXRRDHCADTAL-UHFFFAOYSA-N triethoxy(3-nitropropyl)silane Chemical compound CCO[Si](OCC)(OCC)CCC[N+]([O-])=O FPBXRRDHCADTAL-UHFFFAOYSA-N 0.000 description 1
- FJXRKYLOOJTENP-UHFFFAOYSA-N triethoxy-[2-(2-triethoxysilylethyldisulfanyl)ethyl]silane Chemical compound CCO[Si](OCC)(OCC)CCSSCC[Si](OCC)(OCC)OCC FJXRKYLOOJTENP-UHFFFAOYSA-N 0.000 description 1
- ASAOXGWSIOQTDI-UHFFFAOYSA-N triethoxy-[2-(2-triethoxysilylethyltetrasulfanyl)ethyl]silane Chemical compound CCO[Si](OCC)(OCC)CCSSSSCC[Si](OCC)(OCC)OCC ASAOXGWSIOQTDI-UHFFFAOYSA-N 0.000 description 1
- FBBATURSCRIBHN-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSCCC[Si](OCC)(OCC)OCC FBBATURSCRIBHN-UHFFFAOYSA-N 0.000 description 1
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
- NOPBHRUFGGDSAD-UHFFFAOYSA-N triethoxy-[4-(4-triethoxysilylbutyltetrasulfanyl)butyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCCSSSSCCCC[Si](OCC)(OCC)OCC NOPBHRUFGGDSAD-UHFFFAOYSA-N 0.000 description 1
- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- QPPXVBLDIDEHBA-UHFFFAOYSA-N trimethoxy(3-nitropropyl)silane Chemical compound CO[Si](OC)(OC)CCC[N+]([O-])=O QPPXVBLDIDEHBA-UHFFFAOYSA-N 0.000 description 1
- JQBSHJQOBJRYIX-UHFFFAOYSA-N trimethoxy-[2-(2-trimethoxysilylethyldisulfanyl)ethyl]silane Chemical compound CO[Si](OC)(OC)CCSSCC[Si](OC)(OC)OC JQBSHJQOBJRYIX-UHFFFAOYSA-N 0.000 description 1
- JSXKIRYGYMKWSK-UHFFFAOYSA-N trimethoxy-[2-(2-trimethoxysilylethyltetrasulfanyl)ethyl]silane Chemical compound CO[Si](OC)(OC)CCSSSSCC[Si](OC)(OC)OC JSXKIRYGYMKWSK-UHFFFAOYSA-N 0.000 description 1
- NQRACKNXKKOCJY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSCCC[Si](OC)(OC)OC NQRACKNXKKOCJY-UHFFFAOYSA-N 0.000 description 1
- JTTSZDBCLAKKAY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSSSCCC[Si](OC)(OC)OC JTTSZDBCLAKKAY-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- BNBXBRPOAJZBNB-UHFFFAOYSA-N trimethoxy-[4-(4-trimethoxysilylbutyldisulfanyl)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCSSCCCC[Si](OC)(OC)OC BNBXBRPOAJZBNB-UHFFFAOYSA-N 0.000 description 1
- GSZUEPNJCPXEGU-UHFFFAOYSA-N trimethoxy-[4-(4-trimethoxysilylbutyltrisulfanyl)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCSSSCCCC[Si](OC)(OC)OC GSZUEPNJCPXEGU-UHFFFAOYSA-N 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- KOWVWXQNQNCRRS-UHFFFAOYSA-N tris(2,4-dimethylphenyl) phosphate Chemical compound CC1=CC(C)=CC=C1OP(=O)(OC=1C(=CC(C)=CC=1)C)OC1=CC=C(C)C=C1C KOWVWXQNQNCRRS-UHFFFAOYSA-N 0.000 description 1
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- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- 125000006839 xylylene group Chemical group 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0304—Asymmetric patterns
-
- 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
- B60C1/0016—Compositions of the tread
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1272—Width of the sipe
- B60C11/1281—Width of the sipe different within the same sipe, i.e. enlarged width portion at sipe bottom or along its length
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/25—Incorporating silicon atoms into the molecule
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/30—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule
- C08C19/42—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups
- C08C19/44—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups of polymers containing metal atoms exclusively at one or both ends of the skeleton
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
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- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0355—Circumferential grooves characterised by depth
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Tires In General (AREA)
Abstract
Description
前記主溝は、タイヤ赤道よりもタイヤ軸方向の両外側の位置をタイヤ周方向に連続してのびる一対のショルダー主溝と、前記一対のショルダー主溝の間をタイヤ周方向に連続してのびるセンター主溝とを含み、
前記陸部のタイヤ軸方向最外側に配されるショルダー陸部の少なくとも一方に、タイヤ軸方向にのびるショルダーサイプが設けられ、
トレッド幅Wtと、前記主溝の溝深さDとが下記式(I)を満たし、
前記ショルダー陸部の少なくとも一方に設けられたショルダーサイプの長さLsと、前記トレッド幅Wtとが下記式(II)を満たし、
前記ショルダー陸部を構成するショルダー陸部用ゴム組成物は、ゴム成分100質量部に対して、凝固温度−10℃以下の低温可塑剤を4質量部以上、軟化点60〜120℃の樹脂を3質量部以上含むことを特徴とする
空気入りタイヤに関する。
低燃費化のため、フィラーを減量すると、通常、ウェットグリップ性能が低下するが、所定の低温可塑剤と樹脂をバランスよく配合したショルダー陸部用ゴム組成物を用いることで、低燃費性能を悪化させることなく、ウェットグリップ性能を向上することが可能となる。そして、低温可塑剤を配合する場合、熱劣化特性が低下する傾向があるが、前記式(I)、(II)等を満たすパターンを採用することで、ブロック剛性が向上し、ゴムの変形を抑え、蓄熱も抑えることができる。これは、ウェットグリップ性能を向上させるために樹脂を添加すると、ガラス転移温度(Tg)が上昇し、ウェットグリップ性能は向上するものの、低燃費性が悪化する傾向がある一方、更に低温可塑剤を添加することで、ウェットグリップ性能を向上させつつ、Tgの上昇を抑制できるため、低燃費性の悪化が抑制されると推察される。また、低温可塑剤は分子量が小さいため、熱劣化特性が低下する傾向があるものの、前記パターンでブロック剛性を向上させるで、ゴムの変形が抑えられ、蓄熱しにくくなると推察される。従って、低燃費性、ウェットグリップ性能、操縦安定性の総合性能が改善されると推察される。
図1は、本実施形態の空気入りタイヤ(以下、単に「タイヤ」ということがある。)1のトレッド部2の展開図である。図2は、図1のトレッド部2のA−A線断面図である。本実施形態の空気入りタイヤ1は、例えば、乗用車用として好適に使用される。
10≦Wt/2D≦35が好ましく、13≦Wt/2D≦30がより好ましく、15≦Wt/2D≦25が更に好ましい。
なお、ショルダーサイプの長さLsは、図1、7に記載のとおり、各ショルダーサイプのタイヤ軸方向長さである。
なお、タイヤ外径とは、タイヤを適用リムに装着して無負荷とした状態のタイヤの外径をいう。
なお、BRのシス含量は、赤外吸収スペクトル分析法によって測定できる。
なお、本発明において、凝固温度は、下記方法で測定される値である。
試料をアルミニウムセルの中に密閉し、当該アルミニウムセルを示差走査熱量測定器((株)島津製作所製、DSC−60A)のサンプルホルダーに挿入した後、当該サンプルホルダーを窒素雰囲気下10℃/分で150℃まで加熱しながら吸熱ピークを観察し、得られた吸熱ピークを凝固点とした。
なお、動粘度は、JIS K2283−2000に準拠し、40℃の条件で測定される値である。
前記軟化点の下限は、70℃以上が好ましく、75℃以上がより好ましい。上限は、110℃以下が好ましく、100℃以下がより好ましく、95℃以下が更に好ましい。上記範囲内にすることで、良好な低燃費性、ウェットグリップ性能、操縦安定性の総合性能が得られる傾向がある。
なお、本明細書において、軟化点は、JIS K 6220−1:2001に規定される軟化点を環球式軟化点測定装置で測定し、球が降下した温度である。
ポリテルペンは、テルペン化合物を重合して得られる樹脂である。テルペン化合物は、(C5H8)nの組成で表される炭化水素及びその含酸素誘導体で、モノテルペン(C10H16)、セスキテルペン(C15H24)、ジテルペン(C20H32)などに分類されるテルペンを基本骨格とする化合物であり、例えば、α−ピネン、β−ピネン、ジペンテン、リモネン、ミルセン、アロオシメン、オシメン、α−フェランドレン、α−テルピネン、γ−テルピネン、テルピノレン、1,8−シネオール、1,4−シネオール、α−テルピネオール、β−テルピネオール、γ−テルピネオールなどが挙げられる。
なお、カーボンブラックのN2SAは、JIS K 6217−2:2001によって求められる。
なお、シリカのN2SAは、ASTM D3037−93に準じてBET法で測定される値である。
シランカップリング剤としては、ゴム工業において、従来からシリカと併用される任意のシランカップリング剤を使用することができ特に限定されず、例えば、ビス(3−トリエトキシシリルプロピル)テトラスルフィド、ビス(2−トリエトキシシリルエチル)テトラスルフィド、ビス(4−トリエトキシシリルブチル)テトラスルフィド、ビス(3−トリメトキシシリルプロピル)テトラスルフィド、ビス(2−トリメトキシシリルエチル)テトラスルフィド、ビス(2−トリエトキシシリルエチル)トリスルフィド、ビス(4−トリメトキシシリルブチル)トリスルフィド、ビス(3−トリエトキシシリルプロピル)ジスルフィド、ビス(2−トリエトキシシリルエチル)ジスルフィド、ビス(4−トリエトキシシリルブチル)ジスルフィド、ビス(3−トリメトキシシリルプロピル)ジスルフィド、ビス(2−トリメトキシシリルエチル)ジスルフィド、ビス(4−トリメトキシシリルブチル)ジスルフィド、3−トリメトキシシリルプロピル−N,N−ジメチルチオカルバモイルテトラスルフィド、2−トリエトキシシリルエチル−N,N−ジメチルチオカルバモイルテトラスルフィド、3−トリエトキシシリルプロピルメタクリレートモノスルフィド、などのスルフィド系、3−メルカプトプロピルトリメトキシシラン、2−メルカプトエチルトリエトキシシラン、Momentive社製のNXT、NXT−Zなどのメルカプト系、ビニルトリエトキシシラン、ビニルトリメトキシシランなどのビニル系、3−アミノプロピルトリエトキシシラン、3−アミノプロピルトリメトキシシランなどのアミノ系、γ−グリシドキシプロピルトリエトキシシラン、γ−グリシドキシプロピルトリメトキシシラン、などのグリシドキシ系、3−ニトロプロピルトリメトキシシラン、3−ニトロプロピルトリエトキシシランなどのニトロ系、3−クロロプロピルトリメトキシシラン、3−クロロプロピルトリエトキシシランなどのクロロ系などが挙げられる。市販品としては、デグッサ社、Momentive社、信越シリコーン(株)、東京化成工業(株)、アヅマックス(株)、東レ・ダウコーニング(株)等の製品を使用できる。これらは、単独で用いてもよく、2種以上を併用してもよい。なかでも、スルフィド系、メルカプト系が好ましい。
硫黄としては、ゴム工業において一般的に用いられる粉末硫黄、沈降硫黄、コロイド硫黄、不溶性硫黄、高分散性硫黄、可溶性硫黄などが挙げられる。市販品としては、鶴見化学工業(株)、軽井沢硫黄(株)、四国化成工業(株)、フレクシス社、日本乾溜工業(株)、細井化学工業(株)等の製品を使用できる。これらは、単独で用いてもよく、2種以上を併用してもよい。
加硫促進剤としては、例えば、2−メルカプトベンゾチアゾール、ジ−2−ベンゾチアゾリルジスルフィド(DM(2,2’−ジベンゾチアゾリルジスルフィド))、N−シクロヘキシル−2−ベンゾチアジルスルフェンアミド等のチアゾール系加硫促進剤;テトラメチルチウラムジスルフィド(TMTD)、テトラベンジルチウラムジスルフィド(TBzTD)、テトラキス(2−エチルヘキシル)チウラムジスルフィド(TOT−N)等のチウラム系加硫促進剤;N−シクロヘキシル−2−ベンゾチアゾールスルフェンアミド、N−t−ブチル−2−ベンゾチアゾリルスルフェンアミド、N−オキシエチレン−2−ベンゾチアゾールスルフェンアミド、N−オキシエチレン−2−ベンゾチアゾールスルフェンアミド、N,N’−ジイソプロピル−2−ベンゾチアゾールスルフェンアミド等のスルフェンアミド系加硫促進剤;ジフェニルグアニジン、ジオルトトリルグアニジン、オルトトリルビグアニジン等のグアニジン系加硫促進剤を挙げることができる。これらは、単独で用いてもよく、2種以上を併用してもよい。なかでも、スルフェンアミド系、グアニジン系加硫促進剤が好ましい。
老化防止剤としては特に限定されず、例えば、フェニル−α−ナフチルアミン等のナフチルアミン系老化防止剤;オクチル化ジフェニルアミン、4,4’−ビス(α,α’−ジメチルベンジル)ジフェニルアミン等のジフェニルアミン系老化防止剤;N−イソプロピル−N’−フェニル−p−フェニレンジアミン、N−(1,3−ジメチルブチル)−N’−フェニル−p−フェニレンジアミン、N,N’−ジ−2−ナフチル−p−フェニレンジアミン等のp−フェニレンジアミン系老化防止剤;2,2,4−トリメチル−1,2−ジヒドロキノリンの重合物等のキノリン系老化防止剤;2,6−ジ−t−ブチル−4−メチルフェノール、スチレン化フェノール等のモノフェノール系老化防止剤;テトラキス−[メチレン−3−(3’,5’−ジ−t−ブチル−4’−ヒドロキシフェニル)プロピオネート]メタン等のビス、トリス、ポリフェノール系老化防止剤などが挙げられる。市販品としては、精工化学(株)、住友化学(株)、大内新興化学工業(株)、フレクシス社等の製品を使用できる。これらは単独で用いてもよいし、2種類以上を組み合わせて用いてもよい。なかでも、p−フェニレンジアミン系老化防止剤(より好ましくは、N−(1,3−ジメチルブチル)−N’−フェニル−p−フェニレンジアミン)が好ましい。
ステアリン酸としては、従来公知のものを使用でき、例えば、日油(株)、NOF社、花王(株)、富士フイルム和光純薬(株)、千葉脂肪酸(株)等の製品を使用できる。
酸化亜鉛としては、従来公知のものを使用でき、例えば、三井金属鉱業(株)、東邦亜鉛(株)、ハクスイテック(株)、正同化学工業(株)、堺化学工業(株)等の製品を使用できる。
装着リム:18×5JJ
タイヤ内圧:260kPa
テスト車両:排気量2400cc、前輪駆動車
テストタイヤ装着位置:全輪
SBR1:下記製造例1で作製したSBR1
SBR2:下記製造例2で作製したSBR2
BR:宇部興産(株)製のBR150B(シス含量98質量%)
シリカ:エボニック・デグサ社製のウルトラシルVN3(N2SA175m2/g)
カーボンブラック:三菱ケミカル(株)製のダイアブラックI(N2SA114m2/g)
シランカップリング剤:エボニック・デグサ社製のSi69(ビス(3−トリエトキシシリルプロピル)テトラスルフィド)
可塑剤1:出光興産(株)製のダイアナプロセスAH−24(アロマ系プロセスオイル、凝固温度5℃、40℃における動粘度2000mm2/s)
可塑剤2:出光興産(株)製のプロセスオイルPW−32(パラフィン系プロセスオイル凝固温度−18℃、40℃における動粘度30mm2/s)
可塑剤3:大八化学(株)製のDOS(ビス(2−エチルヘキシル)セバケート、凝固温度−62℃、40℃における動粘度10mm2/s)
可塑剤4:大八化学(株)製のTOP(トリス(2−エチルヘキシルホスフェート)、凝固温度−70℃以下、40℃における動粘度12mm2/s)
樹脂1:アリゾナケミカル社製のSYLVARES SA85(αメチルスチレン系樹脂(α−メチルスチレンとスチレンとの共重合体)、軟化点85℃)
樹脂2:Rutgers Chemicals社製のNOVARES C30(クマロンインデン樹脂、軟化点30℃)
ワックス:日本精蝋(株)製のオゾエース0355
老化防止剤:大内新興化学工業(株)製のノクラック6C(N−フェニル−N′−(1,3−ジメチルブチル)−p−フェニレンジアミン)
ステアリン酸:日油(株)製のステアリン酸「椿」
酸化亜鉛:ハクスイテック(株)製の酸化亜鉛3種
硫黄:鶴見化学(株)製の粉末硫黄
加硫促進剤1:大内新興化学工業(株)製のノクセラーNS(N−t−ブチル−2−ベンゾチアジルスルフェンアミド)
加硫促進剤2:大内新興化学工業(株)製のノクセラーD(N,N′−ジフェニルグアニジン)
窒素雰囲気下、100mlメスフラスコに3−(N,N−ジメチルアミノ)プロピルトリメトキシシラン(3−ジメチルアミノプロピルトリメトキシシラン)(アヅマックス(株)製)を23.6g入れ、さらに無水ヘキサン(関東化学(株)製)を加え、全量を100mlにして作製した。
充分に窒素置換した30L耐圧容器にn−ヘキサンを18L、スチレン(関東化学(株)製)を540g、ブタジエンを1460g、テトラメチルエチレンジアミンを17mmol加え、40℃に昇温した。次に、ブチルリチウムを10.5mL加えた後、50℃に昇温させ3時間撹拌した。次に0.4mol/Lの四塩化ケイ素/ヘキサン溶液を3.5mL加え、30分撹拌を行った。次に、上記末端変性剤を30mL追加し30分間撹拌を行った。反応溶液に2,6−tert−ブチル−p−クレゾール(大内新興化学工業(株)製)0.2gを溶かしたメタノール(関東化学(株)製)2mLを添加後、反応溶液を18Lのメタノールが入ったステンレス容器に入れて凝集体を回収した。得られた凝集体を24時間減圧乾燥させ、SBR1を得た。得られたSBR1のスチレン含有量は28質量%であった。Mwは717,000であり、ビニル含量は60モル%であった。
攪拌機付きオートクレーブに、シクロヘキサン6000g、スチレン150g、1,3−ブタジエン450gおよび使用するn−ブチルリチウムに対して1.5倍モル量に相当するテトラメチルエチレンジアミンを仕込んだ後、n−ブチルリチウム9.5ミリモルを加え、50℃で重合を開始した。重合を開始してから20分経過後、スチレン60g及び1,3−ブタジエン340gの混合物を60分間かけて連続的に添加した。重合反応中の最高温度は70℃であった。
連続添加終了後、さらに40分間重合反応を継続し、重合転化率が100%になったことを確認してから、少量の重合溶液をサンプリングした。サンプリングした少量の重合溶液は、過剰のメタノールを添加して、反応停止した後、風乾して、重合体を取得し、ゲル・パーミエーション・クロマトグラフ分析の試料とした。
少量の重合溶液をサンプリングした直後に、使用したn−ブチルリチウムの0.03倍モルに相当する量のポリオルガノシロキサンA(下記式で表される化合物、日本化学会編 第4版 実験化学講座 第28巻及びその参考文献に記載されている方法により合成することができる。)を10%トルエン溶液の状態で添加し、30分間反応させた後、重合停止剤として、使用したn−ブチルリチウムの2倍モルに相当する量のメタノールを添加して共役ジエン系ゴムIを含有する重合溶液を得た。ゴム分100質量部に対して、老化防止剤として、イルガノックス1520(チバガイギー社製)0.2質量部を、上記の重合溶液に添加した後、スチームストリッピングにより、重合溶媒を除去し、60℃で24時間真空乾燥して、固形状のSBR2を得た。得られたSBR2のスチレン含有量は42質量%であった。Mwは約100万であり、ビニル含量は32モル%であった。
転がり抵抗試験機を用い、テストタイヤを、リム(18×5JJ)、内圧(260kPa)、荷重(3.43kN)、速度(80km/h)で走行させたときの転がり抵抗を測定し、低転がり抵抗性を指数で表示した。指数が大きいほど低燃費性に優れている。なお、指数は、以下の式で示される。
(低燃費性)=(基準比較例のタイヤの低転がり抵抗)/(各配合のタイヤの低転がり抵抗)×100
上記テスト車両で、水深5mmかつ長さ20mの水たまりが設けられた半径100mのアスファルト路面を走行し、前輪の横加速度(横G)が計測された。結果は、速度50〜80km/hの平均横Gであり、基準比較例を100とする指数で示されている。数値が大きい程、ウェットグリップ性能が優れていることを示す。
上記テスト車両でアスファルトの周回コースを走行したときの操縦安定性が、運転者の官能により評価された。結果は、基準比較例を100とする評点であり、数値が大きい程、操縦安定性が優れていることを示す。
3 主溝
4 陸部
8 ショルダー陸部
8A 外側ショルダー陸部
8B 内側ショルダー陸部
34 外側ショルダー横溝
35 外側ショルダーサイプ
38 内側ショルダー横溝
39 内側ショルダーサイプ
Wt トレッド幅
D 主溝の溝深さ
D1 外側ショルダー主溝の溝深さ
D2 内側ショルダー主溝の溝深さ
D3 センター主溝の溝深さ
Ls ショルダーサイプの長さ
Ls1 外側ショルダーサイプ35の長さ
Ls2 内側ショルダーサイプ39の長さ
Te1 外側トレッド端
Te2 内側トレッド端
Po トレッド軸方向外側端
Pi トレッド軸方向内側端
Claims (2)
- トレッド部に、タイヤ周方向に連続してのびる3本以上の主溝と、前記主溝に区分された陸部とが設けられた空気入りタイヤであって、
前記主溝は、タイヤ赤道よりもタイヤ軸方向の両外側の位置をタイヤ周方向に連続してのびる一対のショルダー主溝と、前記一対のショルダー主溝の間をタイヤ周方向に連続してのびるセンター主溝とを含み、
前記陸部のタイヤ軸方向最外側に配されるショルダー陸部の少なくとも一方に、タイヤ軸方向にのびるショルダーサイプが設けられ、
トレッド幅Wtと、前記主溝の溝深さDとが下記式(I)を満たし、
前記ショルダー陸部の少なくとも一方に設けられたショルダーサイプの長さLsと、前記トレッド幅Wtとが下記式(II)を満たし、
前記ショルダー陸部を構成するショルダー陸部用ゴム組成物は、ゴム成分100質量部に対して、凝固温度−10℃以下の低温可塑剤を4質量部以上、軟化点60〜120℃の樹脂を3質量部以上含むことを特徴とする
空気入りタイヤ。
- 前記低温可塑剤は、40℃における動粘度が60mm2/s以下である請求項1記載の空気入りタイヤ。
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JP2019130263A JP2021014200A (ja) | 2019-07-12 | 2019-07-12 | 空気入りタイヤ |
EP20182986.8A EP3763546B1 (en) | 2019-07-12 | 2020-06-29 | Pneumatic tire |
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