Foamed polymeric materials
AssigneeThe Dow Chemical Company
InventorsLaurie J. Scott, Robert E. Erickson, Theodore C. Wallace
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Abstract
Foamed water-swellable polymeric water absorbent materials are prepared by contacting a polymer capable of having a water-swellable character and containing acid moieties in acid form with a blowing agent such as sodium bicarbonate, which blowing agent is capable of neutralizing the acid moieties of the polymer. The foamed polymers are useful in a wide variety of water absorbent applications.
Claims10
A process for preparing a foamed water-swellable polymeric water absorbent material, said process comprising contacting an aqueous polymer dispersion said polymer capable of having a water-swellable character and containing a functionally effective amount of pendant acid moieties in acid form with a carbon dioxide yielding compound decomposeable blowing agent which is capable of neutralizing an effective amount of pendant acid moieties.
A process for preparing a foamed water-swellable polymeric water absorbent material, said process comprising contacting an aqueous polymer dispersion said polymer capable of having a hydrophilic character and containing a functionally effective amount of pendant acid moieties in acid form with a carbon dioxide yielding decomposable compound blowing agent which is capable of neutralizing an effective amount of pendant acid moieties and said polymer is simultaneously subjected to crosslinking.
Dependencies are inferred from the claim text.