Process for producing polyester resin foam and polyester resin f

Details Process for producing polyester resin foam and polyester resin f Process for producing polyester resin foam and polyester resin f

1989-11-30

1991-03-19

Van Balen, William J.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

264 41, 264 468, 264 54, 4283197, 521138, B32B 326

Patent

active

050009915

ABSTRACT:
A process for producing a thermoplastic polyester resin foam comprising melting a thermoplastic polyester resin, mixing the molten resin with a blowing agent and extruding the mixture into a low-pressure zone to carry out expansion molding, characterized in that a compound having two or more acid anhydride groups per molecule, optionally together with a compound of a metal of Group I, II or III elements of the Periodic Table is added to the thermoplastic polyester resin. There is also disclosed a process for producing a thermoplastic polyester resin foam comprising cooling a high-temperature foam immediately after expansion and then re-heating the foam. Further, a thermoplastic polyester resin foam sheet and a food container prepared from the foam sheet are also disclosed.

REFERENCES:
patent: 4119583 (1978-10-01), Filip et al.

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