Patent ID: 7354984
Filing Date: 2008-04-08
Classification: C08G,Y10T

Abstract:
1. A method for drying a nonionic alkylene oxide polymer water-soluble resin, which comprises putting a nonionic alkylene oxide polymer water-soluble resin into a container, degassing the container to a vacuum degree of at most 150 mmHg inside the container, and, with the vacuum degree in the container kept as such, introducing a dry gas having a dew point not higher than the dew point DP calculated according to the following formula (1), into the container at an introduction rate not lower than the introduction rate V calculated according to the following formula (2): wherein Vac, T and V 0 have the following meanings: Vac indicates the vacuum degree (mm Hg), T indicates the temperature inside the container (° C.), V