METHOD FOR PRODUCING CRYSTALLINE POLYAMIDE FINE PARTICLE

• Main Authors: KONDO YOKO, NAKAJIMA HIROSHI, TAKIYAMA KEIICHI
• Format: Patent
• Language: English
• Published: 18.12.2008
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for producing polyamide fine particles by which fine particles of a crystalline polyamide can be produced in a tank having a large capacity, and hence the deposition can be performed in a dissolution tank, variation in particle diameter is made small, and the occurrence of fine particles having irregular shapes is almost suppressed, and which is simple and excellent in reproducibility. SOLUTION: The method for producing crystalline polyamide fine particles comprises mixing a polyamide with a solvent acting to the polyamide as a solvent at a temperature of not lower than the phase-separation temperature and as a nonsolvent at a temperature not higher than the phase-separation temperature, then heating the resulting mixture to form a polyamide solution, and cooling the solution while stirring it so that the fine particles do not deposit on the inner wall of a phase separation tank. COPYRIGHT: (C)2009,JPO&INPIT