Patent ID: 8236876

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 thermal initiator is selected from sodium persulfate, potassium persulfate or ammonium persulfate; wherein the superabsorbent polymer has a degree of neutralization of from about 50 mol % to about 80 mol %; 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 comprising 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; 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 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, and iii) from about 0.1% to about 1% by weight of the dry superabsorbent polymer composition of a chelating agent.