MANUFACTURING METHOD OF POLYCARBONATE RESIN POWDER

PROBLEM TO BE SOLVED: To provide a manufacturing method of polycarbonate resin powder containing extremely little residual organic solvent and having an uniform particle size, and produced by a simple process with stability and good productivity. SOLUTION: It is characteristic that organic solvent o...

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Hauptverfasser:	TSURUKI SHIGENORI, FUJITA TETSUYA, SASAI MASAATSU, ISHIDA MASAHIRO, EZAKI MASANOBU
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MAKING GRANULES OR PREFORMS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a manufacturing method of polycarbonate resin powder containing extremely little residual organic solvent and having an uniform particle size, and produced by a simple process with stability and good productivity. SOLUTION: It is characteristic that organic solvent of polycarbonate resin is heated and condensed under pressure at 40 to 120 deg.C and its concentration becomes 23 to 50% by weight and by using extrusion type evaporator which has an ability of transporting unidirectly contents from entrance to exit, the concentrated solution is flashed at the entrance and supplied as paste and solvent is removed under normal or reduced pressure at a temperature maintaining solid state and polycarbonate powder particle is obtained at the exit.