| abstract |
PROBLEM TO BE SOLVED: To produce a polyester resin foam having excellent cushioning properties, mechanical properties and heat resistance, uniform and fine cells, and a high expansion ratio. SOLUTION: Polyethylene terephthalate resin (A 1) a polyester resin (A) obtained by melt-mixing a polycarboxylic acid (A2) having at least three carboxyl groups, and a compound (B) having two or more oxazoline groups in one molecule. Is melted by an extruder, the obtained melt is mixed with a foaming agent, and the obtained mixture is extruded to a low pressure region to foam and mold. |