0 0. Polymer particles according to claim 0, wherein the polymer particles have a change of characteristic swelling time of less than 0.0. 0. Polymer particles according to claim 0, wherein the polymer particles have a centrifuge retention capacity of at least 00 g/g. 0. Polymer particles according to claim 0, wherein the polymer particles have a mean sphericity from 0.00 to 0.00. 00. Polymer particles according to claim 0, wherein the polymer particles have a 