Color-stable superabsorbent polymer composition
US7504551B2 · kind B2 · utility
13Cited by
3References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2004 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Oct 4, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A color-stable superabsorbent polymer having long-term color stability, and methods of manufacturing the polymer, are disclosed. The superabsorbent polymer is prepared using a sulfinic acid derivative, like 2-hydroxy-2-sulfinatoacetic acid, a salt thereof, or a mixture thereof, as the reducing agent in a polymerization initiator system for the preparation of a superabsorbent polymer from monomers. The resulting superabsorbent polymer resists color degradation during periods of extended storage, even at an elevated temperature and humidity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.