Particulate superabsorbent polymer composition having improved stability

摘要

The present invention relates to a 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 the particulate superabsorbent polymer composition has a mean particle size distribution of from 300 to 400 μm, an original Free Swell Gel Bed Permeability (FSGBP) of about 20×10−8 cm2 to about 200×10−8 cm2; 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 having particles having a particle diameter of larger than 600 μm in an amount of less than about 15 wt % of the particulate superabsorbent polymer composition and as specified by standard sieve classification.

主权项

1. A particulate superabsorbent polymer composition comprising a particulate superabsorbent polymer 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 original Free Swell Gel Bed Permeability (FSGBP) of from about 20×10−8 cm2 to about 200×10−8 cm2 prior to subjecting the particulate superabsorbent polymer composition to the Processing Test; and a compressibility of from about 1.30 mm2/N to 4 mm2/N, and has a permeability stability index of from 0.60 to about 0.99 when subjecting the particulate superabsorbent polymer composition to a Processing Test, and having particles having a particle diameter of larger than 600 μm in an amount of from about 12 wt % to about 25 wt % of the particulate superabsorbent polymer composition and as specified by standard sieve classification.