丙烯酸酯类系列抗冲改性剂是一种具有典型的核-壳结构的高分子聚合物，其核为玻璃化温度较低的具有轻度交联的丙烯酸酯类共聚物，其壳为与PVC具有良好相容性的甲基丙烯酸酯类共聚物。Acrylic Impact Modifier（AIM）is a copolymer with the structure of core shell，the core can effectively transfer the external impact energy into heat and the shell has the good compatibility with PVC matrix，therefore it shows excellent impact-strength，weather resistance and color durability under long-period exposure to outdoor conditions.