Cured resins of high fracture toughness are prepared from N,N'-bisimides of formula I ##STR1## and alkenyl compounds of formula II D(G).sub.m II in which D is an m-valent group and G represents a phenyl ring having at least one alkenyl (e.g. allyl or 1-propenyl) substituent.
高断裂韧性的固化
树脂是由式I的N,N'-双亚酰胺和式II D(G).sub.m II的烯基化合物制备而成,其中D是m价基团,G代表至少有一个烯基(例如Allyl或
1-丙烯基)取代的苯环。