以改进PVC冲击性能为目的而使用的助剂称为抗冲击改性剂。抗冲击改性剂是硬质PVC加工用助剂中用量较大的一类,目前PVC用抗冲击改性剂主要有氯化聚乙烯(CPF)、聚丙烯酸酯类(ACR)、甲基丙烯酸甲酯-丁二烯-苯乙烯三元接枝共聚物(MBS树脂)、ABS树脂和乙烯-醋酸乙烯共聚物(EVA树脂)系列等。在抗冲击改性剂的国际市场上,CPE、MBS、ACR三足鼎立。北美和加拿大1995年 Auxiliaries used for the purpose of improving the impact properties of PVC are called impact modifiers. The impact modifier is a kind of hardener used in the processing of hard PVC. The current impact modifiers for PVC mainly include chlorinated polyethylene (CPF), polyacrylate (ACR), and methacrylic acid. Methyl-butadiene-styrene terpolymer graft copolymer (MBS resin), ABS resin and ethylene-vinyl acetate copolymer (EVA resin) series. In the international market for impact modifiers, CPE, MBS, and ACR are three pillars. North America and Canada 1995