Nanoporous superabsorbent particles
US11596924B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2018 |
| Grant date | Mar 7, 2023 |
| Priority date | — |
| Expiry date | Jun 27, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L2400/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Superabsorbent particles have a median size of from about 50 to about 2,000 micrometers and contain a porous network that includes a plurality of nanopores having an average cross-sectional dimension of from about 10 to about 500 nanometers, wherein the superabsorbent particles exhibit a Vortex Time of about 80 seconds or less and a free swell gel bed permeability (GBP) of 5 darcys or more, of 10 darcys or more, of 20 darcys or more, of 30 darcys or more, of 60 darcys or more, or of 90 darcys or more. A method for forming such superabsorbent particles includes forming a composition that contains a superabsorbent polymer and a solvent system; contacting the composition with a non-solvent system to initiate formation of the porous network through phase inversion; removing non-solvent from the composition; and surface crosslinking the superabsorbent particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.