Moisture absorptive and desorptive ultrafine particles and a product using said ultrafine particles
AssigneeJapan Exlan Company Limited
InventorRyosuke Nishida
Life of this patent
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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 μm and saturated moisture absorptive ratios at 65% RH and 90% RH at 20° C. are not less than 20% by weight and not less than 40% by weight, respectively.
Claims9
1-9. (canceled)
Moisture absorptive and desorptive ultrafine particles, wherein the said particles consist of a cross-linked polymer containing 1.0 to 10.0 meq/g of a salt-type carboxyl group and 0.1 to 2.0 meq/g of the sulfonic acid group and/or salt-type sulfonic acid group as polar groups where an average primary particle size is not more than 0.1 μm and saturated moisture absorptive ratios at 65% RH and 90% RH at 20° C. are not less than 20% by weight and not less than 40% by weight, respectively.
Dependencies are inferred from the claim text.