To provide a compounding agent which further improves wet grip performance, modulus and elongation at break when used in a rubber composition for a tire and to provide a rubber composition for a tire containing the compounding agent.SOLUTION: There is provided a method for producing polyurethane foam particulates, which comprises: a dispersion step of dispersing water, at least one of a non-ionic surfactant and a silicone-based foam stabilizer, a polyol having a hydroxyl group value of 40 to 350 mgKOH/g and a catalyst in a liquid containing at least one selected from the group consisting of an unmodified liquid diene-based polymer, mineral oil and vegetable oil to obtain a dispersion system; and a polymerization step of polymerizing a polyol and a polyisocyanate by mixing the polyisocyanate with the dispersion system so that the molar ratio of isocyanate groups to active hydrogen groups is 1.5 to 6.0 and generating carbon dioxide to obtain polyurethane foam particulates having an apparent density of 1.00 g/cm3 or less dispersed in the liquid.SELECTED DRAWING: Figure 1
【課題】タイヤ用ゴム組成物に用いたときに、ウェットグリップ性能やモジュラス及び破断伸びをさらに向上させる配合剤、及び、上記配合剤を含有するタイヤ用ゴム組成物を提供する。【解決手段】未変性の液状ジエン系重合体、鉱物油及び植物油からなる群より選択される少なくとも1種を含む液状物に、水と、非イオン系界面活性剤及びシリコーン系整泡剤の少なくとも一方と、水酸基価が40~350mgKOH/gのポリオールと、触媒とを分散させることで、分散系を得る、分散工程と、活性水素基に対するイソシアネート基のモル比が1.5~6.0となるように分散系にポリイソシアネートを混合することで、ポリオールとポリイソシアネートとを重合させるとともに二酸化炭素を発生させて、液状物中に分散した見かけ密度が1.00g/cm3以下のポリウレタン発泡微粒子を得る、重合工程とを備える、ポリウレタン発泡微粒子の製造方法。【選択図】図1
METHOD FOR PRODUCING POLYURETHANE FOAM PARTICULATES, POLYURETHANE FOAM PARTICULATES AND RUBBER COMPOSITION FOR TIRE
ポリウレタン発泡微粒子の製造方法、ポリウレタン発泡微粒子、及び、タイヤ用ゴム組成物
2024-03-07
Patent
Electronic Resource
Japanese
IPC: | C08G MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS , Makromolekulare Verbindungen, anders erhalten als durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind / B60C VEHICLE TYRES , Fahrzeugreifen |
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