Ion exchange resin beads having aminoalkylphosphonic groups and

Details Ion exchange resin beads having aminoalkylphosphonic groups and Ion exchange resin beads having aminoalkylphosphonic groups and

1989-07-14

1994-01-11

Page, Thurman K.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Ion-exchange polymer or process of preparing

521 30, C08F 824

Patent

active

052781933

ABSTRACT:
The ion exchange resin beads have functional groups of formula I wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, m, r and q have the meanings stated in claim 1 and which have a matrix of a cross-linked polymer wherein the level of cross-linkages is decreased in the shell area is compared to the core area.
These ion exchange resin beads are prepared by reacting resin beads which have primary or secondary amino groups and the mentioned matrix of a cross-linked polymer with a1) a hypophosphite salt in the presence of an acid, or a2) a hypophosphorous acid and b) formaldehyde or a formaldehyde releasing compound.

REFERENCES:
patent: 4895905 (1990-01-01), Schneider et al.

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