Production method for water-absorbing resin powder
US9102804B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2010 |
| Grant date | Aug 11, 2015 |
| Priority date | — |
| Expiry date | Oct 7, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2300/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing a water-absorbing resin comprises circulation of the water-absorbing resin in a predetermined amount in a pulverization step before a surface cross-linking step. At least a part of a classified polymer is supplied again to the same or a different pulverization step before the surface cross-linking step, wherein the circulation pulverization ratio in the pulverization step, represented by the following equation, is 1.10 to 1.50:(Circulation pulverization ratio)=(total supply amount of the water-absorbing resin to the pulverization step)/(total discharge amount of the water-absorbing resin at the drying step)wherein (total supply amount of the water-absorbing resin to the pulverization step)=(total discharge amount of the water-absorbing resin at the drying step)+(amount of the classified polymer supplied again to the same or a different pulverization step).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.