| 摘要 |
PURPOSE:To increase bulk density, and to dry the titled granular body easily by evaporating methylene chloride at 1.1-50atm. from the hot water dispersion of a polycarbonate type methylene chloride solution. CONSTITUTION:Polymer concentration in the methylene chloride solution of polycarbonate resin is brought to 3-35wt%. The solution is dispersed to hot water, and methylene chloride is evaporated at pressure of 1.1-50atm. in a granulating device, thus manufacturing polycarbonate resin granules. An agitator normally having an agitator, a methylene chloride solution introducing pipe for a resin and an evaporated methylene chloride drawing-out pipe, to which a valve for adjusting pressure, may be used as the granulating device. A temperature where the vapor pressure of methylene chloride reaches to said pressure or higher may be used as the temperature of hot water. The volume ratio of the methylene chloride solution of the resin to hot water is brought to 1:0.1-4, preferably, approximately 1:0.2-3. |
