Superabsorbent polymers having improved processability
US6323252A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Jan 10, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2300/14
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A composition comprising aqueous fluid absorbent polymer particles which have been heat-treated at temperatures greater than 170.degree. C. for more than 10 minutes, wherein the composition has been remoisturized, after the heat-treatment, with an aqueous additive solution, in the absence of an organic solvent or water-insoluble, non-swellable powder, and comprises 1 to 10 percent by weight, based on the total weight of the composition, water and wherein the composition is characterized by the ability to absorb at least 20 grams of a 0.9 weight percent aqueous saline solution under a pressure of 0.3 psi (21,000 dynes/cm.sup.2), that is, a 60 minute 0.3 psi (21,000 dynes/cm.sup.2) AUL greater than 20 grams/gram. A process for preparing such a composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.