| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a production method of composite type microparticles which have a uniform particle diameter and shape and smoothness and are produced in a relatively simple manner by incorporating a fine powder in a step for forming polyamide microparticles. <P>SOLUTION: The production method of composite type microparticles composed of polyamide and fine powder comprises preparing a mixed liquid by mixing a crystalline polyamide, a solvent which acts as a solvent to the crystalline polyamide at a temperature not lower than the phase-separation temperature and acts as a nonsolvent at a temperature not higher than the phase-separation temperature, and a fine powder dispersible in the solvent, then preparing a polyamide solution by heating the mixed liquid until the polyamide is dissolved, and precipitating the polyamide by cooling the polyamide solution to a temperature of not higher than the phase-separation temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
