Patent ID: 7381552

Claim:
A macroporous plastics bead material with an average particle diameter from 10 to 1000 μm, comprising a copolymer of: a) 5-60 wt. % vinylically polymerizable monomers with a water solubility of at least 1% at 20° C. selected from the group consisting of acrylamide, methacrylamide, hydroxyalkyl esters of unsaturated polymerizable carboxylic acids, N-vinylpyrrolidone, methyl methacrylate, 3-allyloxy-1,2-propanediol, methoxypolyethyleneglycol methacrylate and polyethyleneglycol methacrylate, b) 1-40 wt. % vinylically polymerizable monomers with an additional functional group, which can enter into covalent bonds in a reaction with nucleophilic groups of ligands, c) 10-40 wt. % hydrophilic, crosslinking radical-polymerizable monomers with two or more ethylenically unsaturated polymerizable groups, and d) 10-60 wt .% vinylically polymerizable monomers with a water solubility of at most 1% at 20° C. selected from the group consisting of isobutyl methacrylate, n-butyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate and 2-ethylhexyl methacrylate, wherein the wt. % of monomers a) to d) add up to 100%.