摘要 |
PROBLEM TO BE SOLVED: To obtain elastomer molded articles having excellent mechanical properties, heat resistance, and resistance to hydrolysis and, in addition, reduced vaporizability upon heating and reduced bleeding. SOLUTION: Thermoplastic polyester elastomer compositions comprise (a) 100 pts.wt. polyester type block copolymer obtained by reacting a crystalline aromatic polyester with a lactone, (b) 0.1-10 pts.wt. di- or higher functional compound whose functional groups are reactive with the terminal group of component (a) and which meets the formula: (W1-W2)/W1<=0.1 (wherein W1 is a sample weight before heat treatment; and W2 is a sample weight after the heat treatment at 200 deg.C for 30 min) and, and (c) 0.1-5 pts.wt. stabilizer having a molecular weight of not smaller than 2,000. |