Method for producing polyacrylic acid (salt)-based water absorbent resin powder
US9567414B2 · kind B2 · utility
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28References
4Claims
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Key dates
| Filing date | Jan 30, 2012 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | May 23, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2333/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
From a view point of reduction in an out of spec product after surface crosslinking, particularly, when an alkylene carbonate compound is used as a surface crosslinking agent, influence by an air temperature is great, and it is necessary to reduce ethylene glycol which is produced as a byproduct, and there is provided a process for producing a polyacrylic acid (salt)-based water absorbent resin powder, comprising
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.