| abstract |
(57) [Summary] [PROBLEMS] To significantly reduce the amount of organic solvents used, to provide easy and inexpensive storage stability, excellent storage stability, biodegradability and water resistance without the need for special equipment or complicated operations. Provided is a method for producing an aqueous dispersion composition capable of forming an excellent coating film. A method for producing an aqueous dispersion of a biodegradable polyester resin containing a biodegradable polyester (A), a basic compound (B), an organic solvent (C), and (D) water. It comprises a dispersion step, a heating step, an emulsification step and a cooling step. In the dispersion step, all of the following components (A) and components (B) and (C) are stirred under stirring. All or a part of the mixture is roughly dispersed in an aqueous medium, and in the heating step and the emulsifying step, before the emulsifying step is completed, The remaining components are added with stirring, and the mixture is heated to 60 ° C. or the higher of the glass transition temperatures of component (A), and coarse biodegradable polyester resin particles having a particle size of 20 μm or more are 1% by mass or less. It is characterized by stirring continuously until it becomes. |