Process for producing polyester resin foam and polyester resin foam sheet
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United States of America Patent
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-
Mar 19, 1991
Grant Date -
N/A
app pub date -
Nov 30, 1989
filing date -
Dec 1, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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