A thermoplastic elastomer composition obtained by dynamically heat-treating a mixture containing a thermoplastic resin (A) having a melting point of not less than 200°C and an elastomer (B) having a constitutional unit derived from an ester group-containing monomer in the presence of, as a crosslinking agent (C), a polymer (C-1) comprising a (meth)acrylate (c-1) unit having a weight average molecular weight (Mw) of 1,000 to 30,000 and a molecular weight distribution (Mw/Mn) of 1.0 to 4.0 and/or a polymer (C-2) which comprises 5 to 35 mass% of the (meth)acrylate (c-1) unit and 65 to 95 mass% of an aromatic vinyl monomer (c-2) unit, the polymer (C-2) having a weight average molecular weight (Mw) of 1,000 to 30,000 and a molecular weight distribution (Mw/Mn) of 1.0 to 4.0. The composition has a good sea-island structure as a whole and excellent cold resistance, and is useful as a substitute for acrylic rubbers.
一种热塑性弹性体组合物,通过动态热处理含有熔点不低于 200°C 的热塑性
树脂 (A) 和弹性体 (B) 的混合物而获得,弹性体 (B) 的结构单元来自含酯基的单体,作为
交联剂 (C),聚合物 (C-1) 包括(甲基)
丙烯酸酯 (c-1)单元,其重量平均分子量 (Mw) 在 1,000 至 30,000 之间,分子量分布 (Mw/Mn) 在 1.0 至 4.0 之间,和/或聚合物 (C-2),其包括 5 至 35 质量%的(甲基)
丙烯酸酯 (c-1) 单元和 65 至 95 质量%的芳香族
乙烯基单体 (c-1)。该聚合物(C-2)具有 1,000 至 30,000 的重量平均分子量(Mw)和 1.0 至 4.0 的分子量分布(Mw/Mn)。该组合物具有良好的整体海岛结构和优异的耐寒性,可用作
丙烯酸橡胶的替代品。