Process for preparing dry solid water absorbing polyacrylate resin
US4703067A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1987 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | Feb 19, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing a solid, water absorbing, cross-linked polyacrylate resin including combining potassium acrylate and a polyvinyl monomer, such as N,N-methylene bisacrylamide, with water in an amount of 55 to 80 combined weight percent of potassium acrylate and polyvinyl monomer based on the total weight of potassium acrylate, polyvinyl monomer and water to form a monomer mixture, and adding a polymerization initiator to the monomer mixture to initiate polymerization of the monomer mixture. The monomer mixture then is polymerized without external heating by utilizing the exothermic heat of reaction as substantially the only non-ambient energy source to drive water away from said polyacrylate resin to form the cross-linked polyacrylate resin having a water content sufficiently low (i.e. 15% or less) to be powdered, such as by pulverization, without an intermediate drying step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.