Patent ID: 8252873

Claim:
A superabsorbent polymer comprising the free radical polymerization product of an aqueous monomer mixture containing at least one α,β-ethylenically unsaturated monomer comprises acrylic acid that is at least partially neutralized and polymerizable into a water-soluble polymer; at least one monomer having at least two α,β-ethylenically unsaturated groups; from about 0.0005 to 5 parts by weight per 100 parts of the α,β-ethylenically unsaturated monomer of a crosslinking agent having at least two polymerizable double bonds in the molecular unit to covalently crosslink the resulting water-soluble polymer; iron ions in an amount of from about 0.1 to about 3 wppm based on the total weight of the aqueous monomer mixture; and at least one chelating agent in an amount to provide a molar ratio of chelating agent to iron ion of from about 0.8 to about 4.0.