| abstract |
PROBLEM TO BE SOLVED: To provide a method for producing a polyester elastomer having good thermal stability, hydrolysis resistance and color tone of a produced polymer and a high melt polymerization rate. SOLUTION: 1,4-butanediol and molecular weight 50 Reaction of 0-6000 polytetramethylene ether glycol-based glycol component with terephthalic acid-based difunctional carboxylic acid or dimethyl terephthalate-based difunctional carboxylic acid lower alkyl ester component In doing so, as a polymerization catalyst, [A] A method for producing a thermoplastic polyester elastomer, comprising melt-polymerizing in the presence of a titanium compound and [B] a magnesium compound in an amount of 0.2 to 3 mol times as magnesium with respect to titanium of the titanium compound. |