Surface-crosslinking process for water-absorbent resin
US6254990A · kind A · utility
55Cited by
14References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Feb 14, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a surface-crosslinking process of a water-absorbent resin to obtain a water-absorbing agent which has high absorption speed and excellent absorption capacity under a load (a water-absorbent resin which has specific or larger values of properties). In a process comprising the step of adding a crosslinking agent to a dry water-absorbent resin powder to thereby crosslink the neighborhood of its surface, the surface-crosslinking is carried out while the resin powder having a weight-average particle diameter of 200 to 1,000 .mu.m is pulverized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.