| abstract |
(57) [Summary] [Object] An object of the present invention is to provide a method for producing a polyethylene terephthalate resin foam by extrusion foaming using a recovered polyethylene terephthalate resin. [Structure] The ratio of the hydroxyl end groups to all the end groups in the polyethylene terephthalate resin and the intrinsic viscosity of the resin are measured, and the product whose product is 0.40 or more is selected, or it is 0.40 or more. The polyethylene terephthalate resin prepared by adjusting Only a compound having at least one acid anhydride group, or this compound and a compound of a metal of Group 1, Group 2 or Group 3 of the periodic table is added and extruded and foamed. |