| abstract |
PROBLEM TO BE SOLVED: To provide a thermoplastic polyester resin having a uniform resin composition, excellent in buffering properties, mechanical properties and heat resistance, suitably used in applications requiring high-temperature stability and heat insulating properties. Provide a resin foam. SOLUTION: A molten mixture of a thermoplastic polyester resin having a branching parameter of 0.8 or less, a phosphite compound, and a foaming agent is extruded and foamed. |