Method for producing particulate water—absorbing agent composed principally of water absorbing resin
US8138292B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2009 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Mar 13, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29B2009/125
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Provided is a production method for the particulate water-absorbing agent, which can contribute to property enhancement, and further improvement of productivity or the like, as well. One example of the production method for the particulate water-absorbing agent relevant to the present invention includes the polymerization step for obtaining a polymer gel; the drying step for drying the polymer gel to obtain a dried substance; the pulverization step for pulverizing the dried substance or the polymer gel to obtain the particulate water-absorbing resin; the classification step for sieving the particulate water-absorbing resin; the granule sizing step for granule sizing the particulate water-absorbing agent obtained from the particulate water-absorbing resin; and the transporting step for transporting the products produced in each of the steps to other steps. Preferably, one or more steps selected from the pulverization step, the classification step, the granule sizing step and the transporting step after the pulverization step are set under reduced pressure state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.