Method of producing water absorbent resin
US9624322B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2011 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Nov 6, 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 tapping material and a metal sieve mesh, in which the tapping material being heated at 40° C. to 100° C. is installed below the metal sieve mesh, and the metal sieve mesh has an area of 1 to 10 m2/sheet. The classification step further requires introducing a classification aid particle, which has a specific gravity different from that of the water absorbent resin, to the metal sieve mesh; and monitoring the presence or absence of damage to the metal sieve mesh.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.