Method for producing particulate water-absorbing agent composed principally of water-absorbing resin
US9051067B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2009 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | May 4, 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 collecting the fine powders generated during the producing process efficiently without worsening working environment, and also the particulate water-absorbing agent produced by the production method thereof. This production method includes (1) a polymerization step for obtaining a polymer gel, (2) a drying step for drying said polymer gel to obtain a particulate water-absorbing resin, (3) a classification step for sieving said particulate water-absorbing resin, (4) a surface cross-linking step for cross-linking the neighborhood of the surface of said particulate water-absorbing resin (5) a packaging step for filling a packaging material container with said particulate water-absorbing agent for packaging and (6) a transportation step for transporting the products produced in each of the steps to the other steps. In this production method, the fine powders contained in gas composed principally of air, in any of the steps, can be collected by use of a trapping material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.