Process for preparing aminomethylated bead polymers

A process for preparing aminomethylated bead polymers, the process comprising:

• a) converting monomer droplets composed of a mixture comprising at least one monoethylenically unsaturated aromatic compound, at least one multiethylenically unsaturated compound, and at least one initiator to bead polymer;
• b) contacting the bead polymer with:
• compounds of the formula (I) or salts thereof
• where R1=C1-C3-alkyl or H, and
• compounds of the formula (II)
• where n=1 to 100,
• in the presence of a swelling agent and solvent comprising 1,3-dichloropropane, and
• in the presence of protic acids, to give a phthalimidomethylated bead polymer;
• and
• c) hydrolysing the phthalimidomethylated bead polymer to produce aminomethylated bead polymer.