Cation-exchange resins having cross-linked vinyl aromatic polymer matrix with attached amino alkylene phosphonic acid groups, their use, and preparation

摘要

Described is an ion exchange resin prepared from a cross- linked vinyl- aromatic polymer carrying recurring active units of the formula --CH.sub. 2 NHRPO(OH).sub.2 wherein R is a lower alkylene radical. Such resins are useful in selectively removing metal ions from solutions, and may be prepared, e. g., by reaction of a primary amino-substituted cross-linked copolymer with a phosphorus trihalide and a simple (C.sub.1 - C.sub.3) aldehyde.