Super absorbent polyacrylic acid (salt)-based resin powder, method for manufacturing same, and method for evaluating same
US10603653B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2016 |
| Grant date | Mar 31, 2020 |
| Priority date | — |
| Expiry date | Apr 22, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2331/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides polyacrylic acid (salt)-based water-absorbing resin powder having an excellent fluid retention capacity under pressure, an excellent water absorption speed, and an excellent liquid permeability and a method for producing the polyacrylic acid (salt)-based water-absorbing resin powder. The earlier-described objects are attained by: a method for producing water-absorbing resin powder which includes adding an inorganic compound to a crosslinked hydrogel polymer obtained in a polymerization step of polymerizing a polyacrylic acid (salt) and performing crushing in specific gel-crushing conditions; and the resultant water-absorbing resin powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.