Patent ID: 7429632

Claim:
A method of surface cross-linking a superabsorbent polymer comprising the steps of: (a) providing superabsorbent polymer particles; (b) forming a surface-crosslinker composition comprising ethylene glycol diglycidyl ether, water, and 20 to 35 wt % of 1,3-propanediol as a cosolvent; (c) applying the solution of (b) to the surfaces of (a) to provide surface-treated superabsorbent polymer particles; and (d) heating the surface-treated superabsorbent polymer particles at 25° C. to 150° C. for 15 to 180 minutes to form surface crosslinks in the vicinity of the surface of the surface-treated superabsorbent polymer particles, wherein the amount of ethylene glycol diglycidyl ether in (b) is at least 5 wt % less than the ethylene glycol diglycidyl ether used when propylene glycol is a cosolvent to achieve a predetermined degree of surface crosslinking.