POLYMER COMPOSITION, CROSSLINKED BODY AND TIRE

• Main Authors: KIKUCHI TOSHIMITSU, FUKUMOTO TAKATO, SAKAGAMI YUTO, SENGA HIROFUMI, SANO TAKUYA, HAYAKAWA TOSHIYUKI
• Format: Patent
• Language: English; Japanese
• Published: 16.06.2022
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DEVICES OR ARRANGEMENTS RELATED TO TYRES; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; VEHICLE TYRES; VEHICLES IN GENERAL

To provide a polymer composition capable of obtaining a vulcanized rubber which can improve grip performance on ice while maintaining high wear resistance and suppresses increase in hardness with time.SOLUTION: There is provided a polymer composition comprising (A1) a polymer which comprises (A) a conjugated diene polymer and (B) at least one thermally expandable component selected from the group consisting of a foaming agent, a thermally expandable capsule and a thermally expandable graphite, wherein when the composition ratios (molar ratios) of a structural unit represented by the formula (1), a structural unit represented by the formula (2), a structural unit represented by the formula (3) and a structural unit represented by the formula (4) in a polymer are represented by p, q, r, s, respectively, the conjugated diene polymer (A) is a polymer satisfying the following numerical expression (i): 0.75≤(p+(0.5×r))/(p+q+(0.5×r)+s)≤0.97.SELECTED DRAWING: None 【課題】耐摩耗性を高く維持しながら氷上グリップ性能を改善でき、しかも経時変化による硬度の上昇が抑制された加硫ゴムを得ることができる重合体組成物を提供すること。【解決手段】（Ａ）共役ジエン系重合体、及び（Ｂ）発泡剤、熱膨張性カプセル及び熱膨張性黒鉛よりなる群から選択される少なくとも１種である熱膨張性成分、を含有し、（Ａ）共役ジエン系重合体は、式（１）で表される構造単位、式（２）で表される構造単位、式（３）で表される構造単位、及び式（４）で表される構造単位の重合体中の構成比（モル比）をそれぞれｐ、ｑ、ｒ、ｓとしたとき、数式（ｉ）の条件を満たす重合体である（Ａ１）重合体を含む重合体組成物とする。数式（ｉ）：０．７５≦（ｐ＋（０．５×ｒ））／（ｐ＋ｑ＋（０．５×ｒ）＋ｓ）≦０．９７TIFF2022089381000013.tif3179【選択図】なし