Preparation method of spherical melamine resin particulates having crosslinked structure

摘要

According to the present invention, spherical melamine resin particulates having a uniform particle size and crosslinked structure can be prepared by adding an acid catalyst to an aqueous solution containing at least 0.5 to less than 5% by weight of a melamine derivative which is polymerizable in the acid region, to adjust the pH of the aqueous solution to at least 4 to less than 5, and carrying out heat-treatment of the aqueous solution. The spherical melamine resin particulates thus obtained are useful as additives for coating compositions, pigments and other materials.