| 摘要 |
PURPOSE:To facilitate the formation of a water-dispersible composition in which a high-softening point resin is stably dispersed as fine particles, by cooling a high-temperature W/O emulsion phase comprising an organic synthetic resin, a surfactant, and water to effect its phase inversion into an O/W emulsion phase. CONSTITUTION:An organic synthetic resin of a softening point >=65 deg.C (e.g, epoxy resin, polyester resin, or petroleum resin containing about 0.1meq/g or above polar groups) is mixed with about 0.1-10wt%, based on resin solid, surfactant (e.g., polyethylene nonlyphenyl ether of an HLB>= about 10) and about 30wt% or below, based on the resin, hydrophilic solvent (e.g., lower alcohol) by heating to the transition temperature [at least (the softening point of the resin minus 30 deg.C)], and the mixture is hydrated with agitation. The obtained W/O phase is cooled to the transition temperature or below to effect its phase inversion into an O/W phase. Thus, a water-dispersible resin composition is obtained. |
