Superabsorbent polymers and products therefrom
AssigneeHoechst Celanese Corporation
InventorsDouglas R. Chambers, William G-J Chiang, Guy T. Woodrum
Life of this patent
Estimating the term…
Abstract
A surface crosslinked superabsorbent polymer composition, a process for its preparation and articles made therefrom wherein said superabsorbent composition is prepared by surface crosslinking the polymerization product of a carboxyl or carboxylate group containing monomer with a crosslinker solution comprising water, C.sub.3 -C.sub.6 diol and a crosslinking compound having at least two functional reactive groups with the carboxyl or carboxylate groups of said polymerization product.
Claims20
A superabsorbent polymer having a 0.6 psi AUL value of at least 25 g/g and a centrifuge retention value of at least 35 g/g wherein said superabsorbent polymer is the product of a process which comprises dispersing an aqueous solution of C.sub.3 -C.sub.6 diol and a crosslinking compound having at least two reactive, functional groups onto a crosslinked, partially neutralized, carboxyl or carboxylate group base polymer having a 0.3 psi AUL value of 15 g/g or less and heating said dispersion to crosslink said polymer wherein said aqueous solution has a surface tension not greater than about 55 dynes per cm.
A process for preparing a superabsorbent polymer which comprises dispersing an aqueous solution of a C.sub.3 -C.sub.6 diol and a crosslinking compound onto the surface of a crosslinked, partially neutralized, carboxyl or carboxylate base polymer having a 0.3 psi AUL value of 15 g/g or less and heating the mixture to crosslink said polymer wherein said aqueous solution has a surface tension not greater than about 55 dynes per cm and wherein said aqueous solution comprises from about 0.5 to about 3.5 weight percent water and from about 1.0 to about 2.5 weight percent of said C.sub.3 -C.sub.6 diol.
Dependencies are inferred from the claim text.