PULVERIZATION OF POLY-BETA-ALANINE COPOLYMER

PURPOSE:To easily obtain the subject uniform copolymer having small average particle diameter and narrow particle size distribution at a low cost by carrying coarse particles of poly-beta-alanine copolymer on a jet stream and subjecting the particles to collision and pulverization. CONSTITUTION:Coar...

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Bibliographische Detailangaben
Hauptverfasser:	HANEZAWA HIROSHI, OTAKE JUNZO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CRUSHING, PULVERISING, OR DISINTEGRATING CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MILLING GRAIN ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PREPARATORY TREATMENT OF GRAIN FOR MILLING THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To easily obtain the subject uniform copolymer having small average particle diameter and narrow particle size distribution at a low cost by carrying coarse particles of poly-beta-alanine copolymer on a jet stream and subjecting the particles to collision and pulverization. CONSTITUTION:Coarse particles of a poly-beta-alanine copolymer having a reduced viscosity (etaSP/C) of 0.2-15dl/g are pulverized in a jet mill pulverizer, etc., using a dehumidified air, inert gas, etc., having a water content of 1,000 to 500ppm or less at a jet stream velocity of Mach 0.5 to 5.0 (preferably Mach 1 to 3) and classified with a classifier to obtain the objective copolymer having an average particle diameter of 1.0 to 10.0mum. The pulverization and classification are repeated until the particle size reaches the target level.