Patent ID: 7816426

Claim:
A superabsorbent polymer composition comprising a superabsorbent polymer comprising: a) from about 55% to about 99.9% by weight of the superabsorbent polymer of polymerizable unsaturated acid group containing monomer based on the superabsorbent polymer; and b) from about 0.001% to about 5% by weight of internal crosslinking agent based on the polymerizable unsaturated acid group containing monomer; c) from about 50 to 1000 ppm of a thermal initiator based on the polymerizable unsaturated acid group containing monomer; wherein the superabsorbent polymer has a degree of neutralization of greater than about 25%; wherein elements a), b) and c) are polymerized into a crosslinked hydrogel, which is then prepared into superabsorbent polymer particles; the superabsorbent polymer composition further consisting essentially of the following surface additives to form superabsorbent polymer composition particles i) from about 0.001% to about 5% by weight of surface crosslinking agent based on the superabsorbent polymer composition; and ii) from about 0.01% to about 5% by weight of an antioxidant based on the superabsorbent polymer composition is added to the polymerized product whether in crosslinked hydrogel or subsequent superabsorbent polymer particles or superabsorbent polymer composition particle form, wherein the antioxidant is selected from the group consisting of a sulfinic acid, 2-hydroxy-2-sulfinatoacetic acid, 2-hydroxy-2-sulfonatoacetic acid, sulfamic acid, and sulfonic acid, and salts and derivatives of the foregoing and mixtures thereof, iii) from about 0.01% to about 0.5% by weight of a thermoplastic polymer based on the superabsorbent polymer composition wherein the thermoplastic polymer is selected from the group consisting of polyolefin, polyethylene, styrene polybutadiene, linear low density polyethylene (LLDPE), ethylene acrylic acid copolymer (EAA), ethylene alkyl methacrylate copolymer (EMA), polypropylene (PP), maleated polypropylene, ethylene vinyl acetate copolymer (EVA), polyester, polyamide, and blends of all families of polyolefins, and wherein the superabsorbent polymer composition has a free swell gel bed permeability of at least about 6 Darcy as measured by the Free Swell Gel Bed Permeability Test.