IMPROVED METHOD FOR PRODUCING POLYESTER

摘要

PROBLEM TO BE SOLVED: To provide the production of (co) polyester that facilitates control of both of an esterification or ester exchange stage and/or a polycondensation stage in the production of (co) polyester of terephthalic acid.SOLUTION: A method of producing polyester comprises heating of a mixture at least comprising (a) a dicarboxylic acid component comprising a terephthalic acid residue, and (b) a glycol component, the heat performed in the existence of a silicon-containing compound.