| 摘要 |
PURPOSE:To provide the titled resin particles having a dense structure in a spherical form, with strictly controlled particle sizes, by dispersing a polyamide resin in a particular medium contg. a polybasic acid by heating, followed by separating. CONSTITUTION:10pts.wt. or less one or more polybasic acids (e.g., sulfuric acid) are added to 100pts.wt. mixture of a polyamide resin (A) (e.g., nylon 6) with a medium (B) of the formula (wherein R, R' are H, 1-12C straight-chain or branched alkyl; R'' is H, CH3, C2H5) are mixed with stirring at a temp. not less than the m.p. or softening point of components A and B to disperse well. Thereafter, by cooling to a temp. not more than the deposition temp. of said polyamide and operating filtration and the like, the component A is separated from the component B and, if necessary, the component B is completely removed by washing with water or low-boiling org. compds., yielding the titled resin particles with a particle size of 10mum or below.
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