Preparing powder of superabsorbent polymer particles useful to produce hygiene articles, comprises

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The present invention milked with a method of preparation of a powder of particles of polymers superabsorbants to structure “heart-shell” in which a stage of post-reticulation is carried out using a reticulating system including/understanding a (a)-oxazoline not substituted on the cycles oxazoline and a catalyst answering the formula M (X) N in which X is BF4, PF6, SbF6, AsF6 or ClO4 and M is an alkaline or alkaline-earth metal and N = 1 or 2.