Superabsorbent polymers having a slow rate of absorption
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United States of America Patent
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Aug 13, 2002
Grant Date -
N/A
app pub date -
Dec 7, 1999
filing date -
Dec 7, 1999
priority date (Note) -
Expired
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Abstract
Superabsorbent polymers having a slow rate of absorption, and a process for their preparation. The superabsorbent polymer has a slow rate of absorption, is crosslinked with a covalent crosslinking agent and the metal of a polyvalent metal salt and has an Absorption Rate Index of at least about 5 minutes. Such polymers are prepared by contacting a substrate water-swellable, water-insoluble polymer particle with a polyvalent metal salt solution under conditions such that there is formed a polymer having an Absorption Rate Index of at least about 5 minutes.
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