Process for the production of highly water absorptive polymers
US5548047A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1995 |
| Grant date | Aug 20, 1996 |
| Priority date | — |
| Expiry date | May 16, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/32
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing a highly water absorptive polymer comprising the steps of subjecting a water-soluble ethylenically unsaturated monomer comprising as the main component acrylic acid and/or an alkali metal or ammonium salt thereof, and optionally containing a crosslinking agent to a water-in-oil type of reverse-phase polymerization in the presence of water, a water-soluble radical polymerization initiator, a dispersant and a hydrophobic hydrocarbon solvent to form a slurry of water-containing particles of a highly water absorptive polymer in the solvent, adding a polymerizable monomer to the slurry, and polymerizing the polymerizable monomer to obtain agglomerates of the particles of the highly water absorptive polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.