Nippon Shokubai Co., Ltd.

Dai-ichi Kogyo Seiyaku Co., Ltd.

Masaki Tezuka

Michiyuki Kono

Manabu Kikuta

Fumihide Tamura

Taketo Toba

Ritsuo Kitada

Kazuhiko Murata

Hiroshi Tanaka

Takao Yokohashi

Takao Nishihata

To efficiently dry it, a nonionic alkylene oxide-type water-soluble resin is put into a container, then the container is degassed to a prescribed vacuum degree which is maintained while a dry gas having a dew point not higher than prescribed is introduced into the container at a rate not lower than prescribed. Minor volatiles are efficiently removed from the resin in an evaporation tank having a stirring blade. For protecting the dried resin from water, a dry gas is introduced into and air is purged from an empty packaging container whereafter the resin is charged into the container is sealed. By controlling solvent content and visocity of the resin and loading it into a temperature-controlled transportation container and/or unloading it out of the transportation container by the use of a pump, good subsquent processability of the resin and prevention of deterioration thereof are ensured.

Method for drying nonionic alkylene oxide-type water-soluble resin, method for packaging it, and method for transporting it

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Kusatsu, Japan

Masaki Tezuka