Particulate superabsorbent polymer composition having improved stability
US9375507B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2014 |
| Grant date | Jun 28, 2016 |
| Priority date | — |
| Expiry date | Jan 17, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L33/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.