Enhancing absorption rates of superabsorbents by incorporating a blowing agent
US5118719A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1991 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Oct 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2300/10
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An improved superabsorbent polymer having increased rate of water absorption is obtained by the addition, preferably prior to polymerization, of a carbonate blowing agent to a monomer solution of the monomers used to form the superabsorbent polymer. Preferred monomers include (meth)acrylic acids, preferably partially neutralized prior to polymerization and appropriate cross-linking agents. The carbonate cross-linking agents are any carbonate salt soluble or dispersible in the monomer solution, prior to polymerization. The multi-valent cationic salts of carbonate are preferred, especially the complex carbonates, for example, of magnesium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.