SURFACE TREATMENT METHOD OF WATER-ABSORBING RESIN AND PRODUCTION METHOD OF WATER-ABSORBING RESIN

The present invention provides a surface treatment method for a water-absorbing resin comprising three steps of: 1) a humidifying and mixing step for mixing a base polymer and a surface cross-linking agent solution to obtain a "humidified substance";2) a pretreatment step for raising tempe...

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Bibliographische Detailangaben
Hauptverfasser:	KAWANO, Takaaki, MATSUMOTO, Makoto, MOTOYAMA, Atsushi, IRIE, Yoshio, KATO, Seiji
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	The present invention provides a surface treatment method for a water-absorbing resin comprising three steps of: 1) a humidifying and mixing step for mixing a base polymer and a surface cross-linking agent solution to obtain a "humidified substance";2) a pretreatment step for raising temperature of said humidified substance to obtain a "pretreated substance"; and 3) a surface cross-linking reaction step for cross-linking said pretreated substance to obtain a surface cross-linked "water-absorbing resin"; wherein dew point in the pretreatment step of the above 2) is from 50°C to 95°C, and temperature of said humidified substance is raised from temperature below the dew point up to a temperature of 10 °C higher than the dew point..