| 摘要 |
PURPOSE:To provide the titled resin particles in a perfectly spherical form, having a narrow particle size distribution, by dispersing a polyamide resin in a particular medium contg. an anionic surfactant by heating, followed by separating. CONSTITUTION:A polyamide resin (A) (e.g., nylon 6), a medium (B) of the formula (wherein R, R' are H, 1-12C straight-chain or branched alkyl; R'' is H, CH3, C2H5; n is 20 or more) having a MW of 900-1,000,000 (e.g., polyoxyethylene), and 0.1-40% one or more anionic surfactants (C) based on said polyamide resin are mixed with stirring at a temp. of at least the m.p. or softening point of components A and B to disperse well, and then cooled to a temp. of at most the m.p. of the component A and at least the m.p. or softening point of the component B. Then, the component A is separated from the component B, etc. by procedures such as filtering and, if necessary, the component B is completely removed by washing with water or low-boiling org. compds., yielding the titled resin particles.
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