Superabsorbent polymers having a slow rate of absorption

摘要

Superabsorbent polymers having a slow rate of absorption, and a process for their preparation. The superabsorbent polymer has a slow rate of absorption, is crosslinked with a covalent crosslinking agent and the metal of a polyvalent metal salt and has an Absorption Rate Index of at least about 5 minutes. Such polymers are prepared by contacting a substrate water-swellable, water-insoluble polymer particle with a polyvalent metal salt solution under conditions such that there is formed a polymer having an Absorption Rate Index of at least about 5 minutes.