Patent ID: 8177982

Claim:
A method for producing monodisperse chelate exchanger comprising: aminomethyl nitrogen heterocyclic groups as functional groups thereof, comprising: a) reacting monomer droplets of (i) at least one monovinylaromatic compound, (ii) at least one polyvinylaromatic compound in the presence of one initiator or an initiator combination, thereby forming monodisperse crosslinked polymer beads, b) amidomethylating the monodisperse crosslinked polymer beads with one or more phthalimide derivatives, thereby forming amidomethylated polymer beads, c) converting the amidomethylated polymer beads to aminomethylated polymer beads, and d) reacting the aminomethylated polymer beads with halomethyl nitrogen heterocycles, without post-crosslinking, maintaining a pH in the range 4 to 9, to form the monodisperse chelate exchanger comprising aminomethyl nitrogen heterocyclic groups as functional groups thereof.