PARTICULATE SUPERABSORBENT POLYMER COMPOSITION HAVING IMPROVED STABILITY AND FAST ABSORPTION

摘要

The present invention relates to a fast particulate superabsorbent polymer composition comprising a polymer comprising a neutralized aluminum salt solution applied to the surface of a particulate superabsorbent polymer; wherein an aqueous solution of the neutralized aluminum salt has a pH value from about 5.5 to about 8; and subsequent to subjecting the particulate superabsorbent polymer composition to the Processing Test, the particulate superabsorbent polymer composition has a permeability stability index of from about 0.60 to about 0.99, and a compressibility from 1.30 mm2/N to about 4 mm2/N as measured by the Compression Test, and wherein the particulate superabsorbent polymer composition may have a Vortex time of from 25 to 60 seconds and absorbency under load at 0.9 psi of from 15 to 21 g/g.

主权项

1. A particulate superabsorbent polymer composition comprising a particulate superabsorbent polymer comprising from about 0.05 to about 2.0 wt. % based on the total amount of the polymerizable unsaturated acid group containing monomer solution of a foaming agent, and from about 0.001 to about 1.0 wt. % based on the total amount of the polymerizable unsaturated acid group containing monomer solution of a mixture of a lipophile surfactant and a polyethoxylated hydrophilic surfactant, and from 0.01 wt % to about 5 wt % based on the particulate superabsorbent polymer composition weight of a neutralized aluminum salt applied to the surface of the particulate superabsorbent polymer, in the form of an aqueous neutralized aluminum salt solution having a pH value from about 5.5 to about 8; wherein the particulate superabsorbent polymer composition has a Centrifuge Retention Capacity (CRC) of from about 25 grams to about 40 grams of 0.9 weight percent sodium chloride aqueous per gram of the particulate superabsorbent polymer composition, wherein the CRC is measured either before or after subjecting the superabsorbent polymer composition to a Processing Test, and an absorbency under load at 0.9 psi prior to subjecting the particulate superabsorbent polymer composition to the Processing Test of from 15 g/g to 21 g/g; and a Free Swell Gel Bed Permeability (FSGBP) of from about 30×10−8 cm2 to about 200×10−8 cm2 prior to subjecting the particulate superabsorbent polymer composition to the Processing Test; wherein the particulate superabsorbent polymer composition has a Vortex time of from 25 to 60 seconds as measured by the Vortex Test, and has a permeability stability index of from about 0.60 to about 0.99 when subjecting the particulate superabsorbent polymer composition to a Processing Test and a compressibility of from 1.30 mm2/N to about 4 mm2/N as measured by the Compression Test.