Patent ID: 7795345

Claim:
A particulate superabsorbent polymer composition comprising a polymer consisting of: a) from about 55 to about 99.9 wt. % of polymerizable unsaturated acid group containing monomers; b) from about 0.001 to about 5.0 wt. % based on the weight of a) of internal crosslinking agent; said particulate superabsorbent polymer composition having a particle size of from 150 to 850 μm and a particle surface and further comprising c) from about 0.001 to about 5.0 wt. % based on dry polymer powder weight of surface crosslinking agent applied to the particle surface in a surface crosslinking step; d) from about 0.01% to about 5 wt. % based on dry polymer powder weight of a penetration modifier added immediately prior to or during the surface crosslinking step; e) from about 0.01 wt. % to about 5 wt. % based on dry polymer powder weight of a multivalent metal salt comprising an aluminum cation on the particle surface; f) from 0 to about 5 wt % based on dry polymer powder weight of a water-soluble polymer; and g) from about 0.01 to about 5 wt % based on dry polymer powder weight of an insoluble, inorganic powder, wherein the composition has a degree of neutralization of more than about 25%; and a gel bed permeability of at least about 400×10 −9 cm 2 as determined by the Gel Bed Permeability Test set forth herein.