Powdered superabsorbents, containing silica, their preparation process and their use
US5147921A · kind A · utility
12Cited by
1References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1991 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Jun 25, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K3/36
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Hydrophilic, powdered superabsorbents which are insoluble in water, containing by weight, in the dry state, in combination, from 1 to 45% of colloidal silica with an average diameter of non-agglomerated particles of about 9 to about 50 nanometers and 99 to 55% of a cross-linked polymer based on free acrylic acid, partially or totally salified by a sodium or potassium, preparation process and use notably for the absorption of aqueous fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.