JP2017141396A - タイヤ用ゴム組成物 - Google Patents
タイヤ用ゴム組成物 Download PDFInfo
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- B60—VEHICLES IN GENERAL
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- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
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- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
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- C08G18/7642—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring containing at least one isocyanate or isothiocyanate group linked to the aromatic ring by means of an aliphatic group containing at least two isocyanate or isothiocyanate groups linked to the aromatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate groups, e.g. xylylene diisocyanate or homologues substituted on the aromatic ring
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Abstract
Description
ポリカーボネートジオール(旭化成社製T6001、数平均分子量が1000)160gおよび4,4′−ジフェニルメタンジイソシアネート(日本ポリウレタン工業社製ミリオネートMT、数平均分子量が250)80gを80℃で5時間反応性させ、末端イソシアネートポリカーボネートウレタンプレポリマーを得た。これにジスルフィド結合をもつポリエーテル(大都産業株式会社製SULBRID12、数平均分子量が2500)を800gとメチルエチルケトン800gとを混合し、さらに70℃で5時間反応させた後、これを室温まで冷却した。このポリカーボネートとジスルフィド結合含有ポリエーテルとの反応物を反応物1とする。
ポリカーボネートジオール(旭化成社製T6001、数平均分子量が1000)200gおよび4,4′−ジフェニルメタンジイソシアネート(日本ポリウレタン工業社製ミリオネートMT、数平均分子量が250)100gを80℃で5時間反応性させ、末端イソシアネートポリカーボネートウレタンプレポリマーを得た。これにメチルエチルケトン(MEK、試薬)1000gとポリイソプレンオリゴマー(出光興産社製Polyip、数平均分子量が2500)1000gを追加混合し、さらに70℃で8時間反応させ反応物2を得た。
ポリカーボネートジオール(旭化成社製T6001、数平均分子量が1000)140gおよび4,4′−ジフェニルメタンジイソシアネート(日本ポリウレタン工業社製ミリオネートMT、数平均分子量が250)70gを80℃で5時間反応性させ、末端イソシアネートポリカーボネートウレタンプレポリマーを得た。これにジスルフィド結合をもつポリエーテル(大都産業株式会社製SULBRID12、数平均分子量が2500)530gとメチルエチルケトン560gとを混合し、さらに80℃で5時間反応させた後、これを室温まで冷却した。このポリカーボネートとジスルフィド結合含有ポリエーテルとの反応物を反応物4とする。
ポリカーボネートジオール(旭化成製T6001、数平均分子量1000)200gと、4,4′−ジフェニルメタンジイソシアネート(日本ポリウレタン工業製ミリオネートMT、数平均分子量250)100gとを、80℃で5時間反応させ、末端イソシアネートポリカーボネートウレタンプレポリマー(反応物5)を得た。
得られた加硫ゴムシートから、JIS K6251に準拠してJIS3号ダンベル型試験片を切り出した。得られた試験片用い、JIS K6251に準拠し100%変形時の引張り応力、300%変形時の引張り応力、引張り破断強度および引張り破断伸度を測定した。得られた結果は、標準例1の値を100とする指数として表1に示した。いずれの指数も値が大きいほど、100%変形時の引張り応力、300%変形時の引張り応力、引張り破断強度および引張り破断伸度が優れることを意味する。
・SBR:水酸基を有するスチレンブタジエンゴム、商品名:タフデンE581(旭化成ケミカルズ社製)、SBR100質量部に対して油展オイル37.5質量部を添加した油展品
・BR:ブタジエンゴム、(Nipol1220、日本ゼオン社製)
・シリカ:1165MP(Solvay社製)
・カーボンブラック:シーストN(東海カーボン社製)
・微粒子1〜3:上記製造例1〜3により得られた微粒子1〜3
・微粒子4:上記製造例4により得られた微粒子4(比較微粒子)
・シランカップリング剤:TESP(Si69、Evonik社製)
・亜鉛華:酸化亜鉛3種(正同化学工業社製)
・ステアリン酸:ビーズステアリン酸(日本油脂社製)
・老化防止剤:6PPD(フレキシス社製)
・硫黄:金華印油入微粉硫黄(鶴見化学工業社製)
・加硫促進剤1:加硫促進剤CBS(ノクセラーCZ−G、大内新興化学工業社製)
・加硫促進剤2:サンセラーD−G(三新化学工業社製)
・オイル:エキストラクト4号S(昭和シェル石油社製)
Claims (7)
- ジエン系ゴム100質量部に、平均粒径が0.001〜100μmで架橋構造を有する有機微粒子が1〜100質量部配合されてなるゴム組成物であって、前記有機微粒子が、繰り返し単位が互いに異なる少なくとも2種のセグメントからなる共重合体の架橋微粒子であり、前記少なくとも2種のセグメントが、官能基を有する分子量500〜20000のオリゴマーまたはプレポリマーからなり、前記官能基が前記少なくとも2種のセグメント間の架橋構造を形成してなることを特徴とするタイヤ用ゴム組成物。
- 前記セグメントの少なくとも1つが、更に硫黄原子、メルカプト基、チオエーテル結合、およびポリスルフィド結合からなる群から選ばれる少なくとも1つを有することを特徴とする請求項1に記載のタイヤ用ゴム組成物。
- 前記ジエン系ゴム100質量部に、更にカーボンブラックおよび/または白色充填剤を1〜100質量部配合してなることを特徴とする請求項1または2に記載のタイヤ用ゴム組成物。
- 前記有機微粒子の架橋構造が、水または有機溶剤からなる分散媒中で、前記官能基が前記少なくとも2種のセグメント間を架橋してなる架橋構造であることを特徴とする請求項1〜3のいずれかに記載のタイヤ用ゴム組成物。
- 前記有機微粒子の架橋構造が、ゴム成分からなる分散媒中で、前記官能基が前記少なくとも2種のセグメント間を架橋してなる架橋構造であることを特徴とする請求項1〜3のいずれかに記載のタイヤ用ゴム組成物。
- 前記ゴム成分が、前記ジエン系ゴムの少なくとも1部と同じ種類であることを特徴とする請求項5に記載のタイヤ用ゴム組成物。
- 請求項1〜6のいずれかに記載のタイヤ用ゴム組成物からなるタイヤトレッドを有する空気入りタイヤ。
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