Foamed polymeric materials
First Claim
1. 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.
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Accused Products
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.
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Citations
10 Claims
- 1. 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.
- 6. 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.
Specification