| 摘要 |
PURPOSE:The titled composition capable of providing a rubbery elastomer having a vibration damping effect, etc., prepared by forming microcapsules each containing a thermoplastic substance as a shell wall material and a heat-expandable core substance, mixing the microcapsules with a rubber or a rubbery elastomer substance. CONSTITUTION:1-30pts.wt. microcapsules each containing a thermoplastic substance such as polypropylene as a shell wall material and a core substance capable of expanding the cell wall material by heat (e.g., isobutane or sodium bicarbonate) are added to 100pts.wt. rubber or rubbery elastomer substance (e.g., polyisoprene rubber) to obtain the purpose expansion molding rubber composition. When this composition is molded by heating, the microcapsules expand and the core substance gasifies to leave cell structures in the mold. It is therefore possible to obtain a rubber sheet-like molding having excellent properties.
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