| abstract |
A method for producing a polyester capable of producing a polyester resin having a high molecular weight and sufficiently satisfying toner characteristics, which is difficult in the conventional polycondensation polymerization technique of a polyester resin in an aqueous medium, and low energy To provide a polyester particle dispersion obtained thereby. A polyvalent acid component having a hydrophobicity parameter (Log (P)) of −0.5 or more and 20 or less and a polyvalent acid component having a hydrophobicity parameter (Log (P)) of −0.5 or more and 20 or less. An alcohol component and a hydrophobic substance having a hydrophobicity parameter (Log (P)) of −0.5 or more and 20 or less are emulsified or dispersed in an aqueous medium, and then the polyvalent compound is coexisted in the presence of the hydrophobic substance. A polyester is produced by polycondensation of an acid component and the polyhydric alcohol component. Then, this is applied to, for example, an emulsion polymerization aggregation method to produce a toner. [Selection figure] None |