METHOD FOR PRODUCING HIGH-MOLECULAR WEIGHT POLYBUTYLENE SUCCINATE

摘要

PROBLEM TO BE SOLVED: To efficiently produce a high-molecular weight polybutylene succinate from 1,4-butanediol and succinic acid or its derivative. SOLUTION: A prepolymer formed by a prepolymerization process is further subjected to polycondensation by using a polymerizer equipped with a mixing blade, in a cylindrical vessel or a vessel having a conical lower part arranged in the vertical direction, comprising plural vertically piled twisted rectangular frame structures which are composed of two horizontal members A and B and two vertical members C and D arranged with keeping a very small gap from the wall surface of the vessel in which the lower horizontal member B is shifted from the upper horizontal member A by a phase ofθ2 in the rotation direction or in the opposite direction and a horizontal member B1 below a frame structure positioned above is intersected with a horizontal member A2 above a frame structure adjacent to the frame structure positioned below at an angle ofθ1 at the center of rotation and connected.