Superabsorbent polymeric compositions and process for producing the same
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United States of America Patent
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Apr 3, 1990
Grant Date -
N/A
app pub date -
Nov 17, 1987
filing date -
Nov 17, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Superabsorbent polymeric compositions are prepared from monomer including acrylic acid and an effective amount of a second hydrophilic monomer, which can be a soluble salt of beta-acryloxypropionic acid. Preferably, the pH of the aqueous monomer solution is adjusted to substantially exclude free acid, and the aqueous monomer solution is coated onto a heated surface to both polymerize the monomer and dry the resulting hydrogel. Free acid thermal degradation products are avoided and the superabsorbent product has greater absorption capacity than acrylate homopolymer.
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