Polysaccharide graft polymers which comprise an acetal-containing or aldehyde-containing homopolymer or copolymer grafted to a polysaccharide base have been prepared. The monomer repeating units in the homopolymer are derived from one or more ethylenically or allylically unsaturated monomers containing an acetal group or aldehyde group; The monomer repeating units in the copolymer are derived from the above monomer and derived from one or more ethylenically or allylically unsaturated monomers other than the acetal-containing or aldehyde-containing monomer. A and A' are independently a lower alkyl or A and A' together form at least a 5-membered cyclic acetal; with the proviso that the graft polymer contain no ##STR1## groups when the aldehyde groups are present. The aldehyde-containing graft polymers are useful for imparting wet strength to paper. Various novel acetal- and aldehyde-containing monomers have also been prepared; they can be graft polymerized to polysaccharide substrates or polymerized by conventional emulsion polymerization techniques with vinyl polymerizable monomers.
已经制备出了包含
缩醛基或醛基的同聚物或共聚物嫁接到
多糖基底上的
多糖嫁接聚合物。同聚物中的单体重复单元来自于一个或多个含有
缩醛基或醛基的
乙烯基或烯丙基不饱和单体;共聚物中的单体重复单元来自于上述单体和来自于一个或多个不含
缩醛基或醛基单体的
乙烯基或烯丙基不饱和单体。A和A'分别是较低的烷基或A和A'一起形成至少一个5元环
缩醛基;但是嫁接聚合物在存在醛基时不包含##STR1##基团。含有醛基的嫁接聚合物对于赋予纸张湿强度很有用。还制备了各种新型含
缩醛基和醛基的单体;它们可以嫁接聚合到
多糖基底上或通过常规乳液聚合技术与
乙烯基可聚合单体共聚合。