Unsaturated hydantoin derivatives of the formula ##STR1## where R.sub.1 and R.sub.2 are alkyl, R.sub.3 is vinyl, allyl, alkylene, substituted alkylene or polyvalent aralkyl, R.sub.4 is vinyl or allyl and n is 1 to 3, are coagents for curing polymeric compositions to improve their physical, chemical and electrical properties. These coagents are particularly useful in crosslinking PVC, polyethylene, chlorinated polyethylene and poly(ethylene/vinyl acetate) compositions.
式为##STR1##的不饱和
肟衍
生物,其中R.sub.1和R.sub.2是烷基,R.sub.3是
乙烯基,烯丙基,烷基,取代烷基或多价芳基烷基,R.sub.4是
乙烯基或烯丙基,n为1至3,是用于固化聚合物组合物以改善其物理,
化学和电气性能的共同剂。这些共同剂在交联P
VC,聚
乙烯,
氯化聚乙烯和聚(
乙烯/
醋酸乙烯)组合物中特别有用。