Process for producing coarse-particle anion-exchanger gels

Process for producing monodisperse anion-exchanger gels with high stability and purity and grain size greater than 800 μm, comprising:

• a.) forming a suspension of a seed polymer composed of a crosslinked polymer with a swelling index of from 2.5 to 7.5 and with less than 1% by weight of non-vapourizable, extractable fractions in a continuous aqueous phase,
• b.) swelling the suspended seed polymer in a monomer mixture made from vinyl monomer, crosslinker and free-radical initiator,
• c.) polymerizing the monomer mixture in the seed polymer,
• d.) swelling the resultant polymer in a second monomer mixture made from vinyl monomer, crosslinker and free-radical initiator,
• e.) polymerizing the second monomer mixture in the first seed-feed polymer and
• f.) functionalizing the resultant copolymer with swelling index from 1.5 to 3 and average diameter greater than 520 μm by chloromethylation and then amination to give the anion exchanger.