Patent ID: 7169843

Claim:
A superabsorbent polymer composition comprising a polymer consisting essentially 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 superabsorbent polymer composition 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; d) from about 0.01% to about 5 wt. % based on dry polymer powder weight of a penetration modifier added immediately before, during or immediately after the surface crosslinking step; e) from 0 to about 5 wt. % based on dry polymer powder weight of a multivalent metal salt on the surface; f) from 0 to 2 wt % based on dry polymer powder weight of a surfactant on the surface; 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 numeric value GBP is at least about [54000 e −0.18x +75]×10 −9 cm 2 where x is the numeric value of centrifuge retention capacity; and a shear modulus G′ is less than about 9,500 dynes/cm 2 and an absorption against pressure at 0.7 psi of less than about 23 g/g.