| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a resorcine resin with reduced content of unreacted resorcine and excellent in flowability. SOLUTION: The invention relates to the method for reducing amount of the unreacted resorcine comprising heating the resorcine resin to a molten state and removing sufficient amount of the vaporized unreacted resorcine to outside by feeding an inert gas to the surface of the resorcine resin and discharging the gas with the unreacted resorcine to outside of the system. The invention relates to the method for reducing amount of the unreacted resorcine which comprises following steps for improving efficiency, a dividing step to divide the resorcin resin into a comparatively high molecular weight component and a comparatively low molecular weight component and then heating the low molecular weight component to a molten state and removing the vaporized unreacted resorcine to outside by feeding an inert gas to the surface of the resorcine to remove sufficient amount of the unreacted resorcine and joining it with the high molecular weight polymer component. COPYRIGHT: (C)2007,JPO&INPIT
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