Moisture absorptive and desorptive ultrafine particles and a product using said ultrafine particles
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United States of America Patent
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Dec 23, 2008
Grant Date -
Aug 9, 2007
app pub date -
Nov 18, 2004
filing date -
Mar 19, 2004
priority date (Note) -
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Abstract
To provide moisture absorptive and desorptive ultrafine particles having high moisture absorptive and moisture desorptive properties and particularly having an excellent moisture absorptive rate and also a product using said ultrafine particles. Moisture absorptive and desorptive ultrafine particles, characterized in that, the said particles consist of a cross-linked polymer containing 1.0 to 10.0 meq/g of a salt-type carboxyl group as a polar group where an average primary particle size is not more than 0.2 .mu.m and saturated moisture absorptive ratios at 65% RH and 90% RH at 20.degree. C. are not less than 20% by weight and not less than 40% by weight, respectively.
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