Method of producing water absorbent resin
US9453091B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2011 |
| Grant date | Sep 27, 2016 |
| Priority date | — |
| Expiry date | Dec 9, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/0288
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for producing a water absorbent resin, the method including a polymerization step, a drying step, a classification step, and a surface crosslinking step. The classification step carried out before or after the surface crosslinking step requires use of a metal sieve mesh having stretch tension from 35 to 100 N/cm, in which an air jet cleaner or an air jet brush cleaner and plural tapping balls or tapping blocks are installed below the metal sieve mesh, a classification aid particle having specific gravity different from that of the water absorbent resin powder is added, and a fine powder of the water absorbent resin and the classification aid particle are removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.