Abstract: Hypercrosslinked polymeric adsorbents exhibiting improved porosity, namely, a combination of micropores, mesopores and macropores, with an enhanced portion of mesopores, are produced by radical suspension polymerization of divinylbenzene or copolymerization of styrene with more than 40 mol % of the aromatic divinyl compound in the monomer mixture, in the presence of diluents or mixtures thereof, which properties are close to those of &thgr;-solvents, so that the divinyl compounds form bridges in sufficient numbers to produce a stable porous polymer network without additional subsequent bridging.