| 摘要 |
PURPOSE:To facilitate the formation of fine spherical particles of an epoxy resin improved in heat resistance and solvent resistance, by treating said particles cured with an amine curing agent with a polybasic acid. CONSTITUTION:Fine spherical particles of an epoxy resin, average particle diameter of 0.1-100mu, cured with an amine curing agent are treated with a polybasic acid. As processes for preparing said particles, (1) a process in which an uncured epoxy compound is cured after it is dispersed in an aqueous liquid and (2) a process in which an uncured epoxy compound and an amine curing agent are polymerized by static precipitation polymerization in a liquid polyol are particularly preferable from the viewpoint of the uniformity, sphericity, etc., of the particles. Above all, the process (1), especially, that in which an emulsion made by using a surfactant, etc., is used is preferable in respect of the rate of production. As the polybasic acids, mineral acids and compounds having carboxyl groups or sulfonic groups directly bonded to a benzene ring are used desirably. |
