Anionic polymer hydrogels and a process for making the same
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United States of America Patent
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Feb 6, 1990
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app pub date -
Jan 26, 1989
filing date -
Jan 26, 1989
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Abstract
Novel anionic polymeric hydrogels based on sulfonated amino aldehyde resins and a process for preparing such hydrogels are described. The hydrogels may include poly(N-vinyl 2-pyrrolidone) and other additives. Such hydrogels may be prepared by a four step process in which melamine and/or urea are reacted with formaldehyde, sulfonated, condensed to form a viscous gel and dried.
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