Superabsorbent polymer having improved absorption rate and absorption under pressure
US5462972A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1995 |
| Grant date | Oct 31, 1995 |
| Priority date | — |
| Expiry date | May 18, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2013/530656
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A carboxylic containing superabsorbent polymer having a swell rate of at least 0.3 g./g.sec., a gel strength of about 40,000 to about 150,000 dynes/cm.sup.2, a centrifuge capacity at 30 minutes of about 20 to about 50 g/g, an absorption permeability under pressure at 60 minutes of at least 5 g/g at wherein the ratio of the absorption permeability under pressure at 15 minutes is at least 25% of the absorption permeability under pressure at 60 minutes is disclosed. The superabsorbent polymer is prepared from a solution of carboxylic containing monomers, a cross linking agent, and a blowing agent. The polymer is subsequently treated with a surface crosslinking agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.