| 摘要 |
PURPOSE:To obtain a water-based dispersion capable of giving coating films with greatly high mechanical strength and also excellent in water resistance, by compatibilizing an epoxy resin and selfdispersible vinyl resin with an organic solvent followed by dispersion in water and then removing the organic solvent at reduced pressures under heating. CONSTITUTION:Firstly, (A) an epoxy resin (pref. of bisphenol type) and (B) a self-dispersible vinyl resin [pref. a copolymer of (meth)acrylic acid ethylene oxide adduct and another vinyl monomer] are compatibilized with (C) an organic solvent (pref. acetone), and an aqueous medium is added to the resultant system (compatibilized product) followed by mixing under agitation into an emulsion. Subsequently, the component C is removed from the emulsion at reduced pressures under heating pref. at 25-50 deg.C under a pressure of 10-250mmHg, thus affording the objective dispersion. The ratio A/B is pref. (1:8) to (8:1) and the amount of the component C to be used is pref. 20-40wt.%. The aqueous medium is preferably used at 2-10vol. times the compatibilized product. |
