| 摘要 |
PURPOSE:To obtain water-insoluble fine particles low in water soluble content, smooth in surface luit with partly depressed portions, useful as coating filler, by homogeneously dissolving or dispersing a reactive resin in a granulating stock solution in advance. CONSTITUTION:The objective fine particles is obtained by spray drying of an aqueous solution prepared by dissolving (A) a water-soluble polysaccharide (e.g. starch) and (B) a reactive resin (e.g. melamine resin) or (C) a water-soluble crosslinking agent (e.g. ethylene glycol diglycidyl ether) in water to effect granulation followed by heat treatment (pref. at 60-200 deg.C) of the resultant particles to effect crosslinking and insolubilize the particles to water. |
