Particulate superabsorbent polymer composition having improved stability
US9302248B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 2013 |
| Grant date | Apr 5, 2016 |
| Priority date | — |
| Expiry date | Dec 30, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2343/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a particulate superabsorbent polymer composition having improved stability comprising a polymer comprising from about 0.01 wt % to about 5 wt % of 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 an original Free Swell Gel Bed Permeability (FSGBP) of about 20×10−8 cm2 to about 200×10−8 cm2 and a compressibility of from about 1.30 mm2/N to about 4 mm2/N prior to subjecting the particulate superabsorbent polymer composition to a Processing Test; 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.