Rheology modification by porous gel particles

A method comprising adding crosslinked polymer particles (p) to a liquid medium, the crosslinked polymer particles (p) obtained by grinding a macrogel prepared by a process comprising a radical polymerization step (E) which comprises reacting, within a reaction medium M comprising pore formers:

• ethylenically unsaturated monomers, containing monomers m1 bearing at least two ethylenic unsaturations;
• at least one radical polymerization initiator;
• optionally at least one radical polymerization control agent
• to modify the rheology of said liquid medium,
• wherein:
• the crosslinked polymer particles (p) have in a dry state, an average diameter ranging between 0.5 to 250 microns when measured using a sieve;
• and
• the macrogel has an average pore size greater than or equal to 500 nm.