A water-soluble and/or water-swellable hybrid polymer comprising:(i) from 5 wt.-% to 95 wt.-% water-soluble and/or water-swellable polysaccharide polymer；(ii) from 5 wt.-% to 95 wt.-% synthetic polymer comprising: (a) from 90 mol-% to 99.9 mol-%, preferably 95 mol-% to 99.5 mol-% of repeating units according to Formula (1)(b) from 0.01 mol-% to 10 mol-%, preferably to 5 mol-%, more preferably to 3 mol-% of crosslinking or branching units, wherein the crosslinking or branching units result from the incorporation of a monomer comprising at least two olefinically unsaturated double bonds；characterised in that the components (i) and (ii) are polymerised by radical precipitation polymerisation in a polar solvent.
