| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an aqueous polyester resin fine particle dispersion, capable of extremely decreasing an amount of a residual solvent remained in resin particles and capable of giving excellent storage stability to the dispersion, and to provide an electrophotographic toner containing the residual solvent in an extremely decreased amount. SOLUTION: In this method, a polyester resin containing alkyl radicals and/or alkenyl radicals and carboxy radicals is swelled by an organic solvent by which the polyester resin is not dissolved but swelled and which has a boiling point of <100°C, so as to form a swelled material, then the swelled material is mixed into an aqueous medium containing a basic compound, so as to conduct neutralization of a part or all of the carboxy radicals in the polyester resin with the basic compound and dispersion of the swelled material in the aqueous medium in a state of fine particles, and further the organic solvent is removed therefrom, so that the aqueous polyester resin fine particle dispersion is produced. The electrophotographic toner contains fine particles which are obtained by separating polyester resin fine particles from the aqueous polyester resin fine particle dispersion and drying the separated particles. COPYRIGHT: (C)2004,JPO&NCIPI |
