Compounds useful in making crosslinkable polymers having the formula (I): ##STR1## wherein R is hydrogen or methyl; R.sup.1 is cyano or ##STR2## wherein R.sup.2 is alkyl; Z is --X--R.sup.3 --X-- or ##STR3## wherein each --X-- is --O-- or --NR.sup.4 --, provided at least one --X-- is --NR.sup.4 -- wherein R.sup.4 is hydrogen or alkyl, R.sup.3 is divalent hydrocarbon and D.sub.1 and D.sub.2 together are the carbon atoms necessary to complete a 5 to 7 membered ring. These compounds can be homopolymerized or copolymerized with each other or with other polymerizable ethylenically unsaturated monomers to give crosslinkable polymers. Such polymers can be purified by conventional purification techniques such as dialysis, diafiltration, ultrafiltration without losing their capability of crosslinking. The resulting purified polymers are particularly useful in photographic materials as gelatin extenders, binders or polymeric color couplers.
在制备具有以下
化学式(I)的可交联聚合物中有用的化合物:其中R为氢或甲基;R.sup.1为
氰基或其中R.sup.2为烷基;Z为--X--R.sup.3--X--或其中每个--X--为--O--或--NR.sup.4--,至少一个--X--为--NR.sup.4--,其中R.sup.4为氢或烷基,R.sup.3为二价碳氢化合物,D.sub.1和D.sub.2共同构成必要的碳原子以形成5至7元环。这些化合物可以与彼此或其他可聚合的
乙烯不饱和单体共聚或均聚,形成可交联聚合物。这种聚合物可以通过传统的纯化技术(如透析、透析过滤、超滤)进行纯化,而不会失去其交联能力。得到的纯化聚合物在摄影材料中特别适用作明胶延伸剂、粘合剂或聚合物
着色剂。