still for framstellning of a alkalimetallkarboxylatsalt of a sterkelse - polyakrylnitrilymppolymer or a sterkelse - polymetakrylnitrilymppolymer

摘要

1325998 Saponified graft polymers GRAIN PROCESSING CORP 21 April 1971 [18 May 1970] 10540/71 Heading C3G [Also in Division A5] A starch-polyacrylonitrile or starch-polymethacrylonitrile graft polymer is saponified in an aqueous medium containing a C 1 to C 5 - alkanol to yield a water-insoluble alkali metal carboxylate salt of said graft polymer. In examples, saponification is carried out in aqueous methanolic-sodium or potassium hydroxide solution or ethanolic-potassium hydroxide solution.