Method for producing water-swellable hydorphilic polymers, said polymers and use thereof
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United States of America Patent
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May 20, 2003
Grant Date -
N/A
app pub date -
Apr 6, 2001
filing date -
Oct 8, 1998
priority date (Note) -
Expired
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Abstract
Water-swellable hydrophilic polymers are prepared by neutralization of the acidic hydrogel having a degree of neutralization of 0-40 mol % to an ultimate degree of neutralization of 60-85 mol % by mixing with a neutralizing agent in a mincer comprising a system of screw, rotating blade, restricted flow zone and breaker plate, wherein the mincer has a power output of from 1000 to 6000 Wh/m.sup.3 the hydrogel passes through a zone having-an energy dissipation density of from 400 to 800 W/1 of mixing volume the average residence time of the hydrogel in the mincer is from 5 to 30 seconds the breaker plate has an open area of from 20 to 40%.
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