| 摘要 |
PROBLEM TO BE SOLVED: To provide a method which is more conveniently used to produce non-solid products (e.g., polyester coatings) initially before employing pelletized solid polyester resins in consideration of: shortening the cycle time of polyester production; obtaining products in a syrup form; and containing a polymer and a nonreactive carrier.SOLUTION: An oligomer is converted into a polymer by polycondensation at high temperature under high pressure in a nonreactive carrier capable of forming an azeotrope with water, and medium and high molecular weight polyester polymers are produced in a syrup form from an ester oligomer. The oligomerization and polycondensation reactions are monitored using a non-viscometric measurement method. |
