Polyacrylate superabsorbent post-polymerization neutralized with solid, non-hydroxyl neutralizing agent.
US5856410A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1997 |
| Grant date | Jan 5, 1999 |
| Priority date | — |
| Expiry date | Aug 20, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2810/20
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A new and improved method of manufacturing an acrylic acid superabsorbent polymer, that is manufactured by any known technique, except that the acrylic acid monomer is polymerized to substantial completion before neutralization, and neutralization is accomplished by admixing a solid, e.g., powdered or granular, neutralizing agent into the acrylic acid polymer. Preferably, the neutralizing agent is a solid, non-hydroxide neutralizing agent, such as sodium carbonate, potassium carbonate, ammonium carbonate or mixtures thereof. Cross-linking may be accomplished during polymerization, simultaneously with neutralization, or cross-linking may be carried out in a separate processing step subsequent to neutralization, or both.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.