Process for producing foamed articles of aromatic polyesters

Details Process for producing foamed articles of aromatic polyesters Process for producing foamed articles of aromatic polyesters

1980-01-08

1981-08-18

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 50, 264 53, 264 54, 264101, 264257, 264DIG5, B29D 2700

Patent

active

042845963

ABSTRACT:
This invention provides a commercially advantageous process for producing a foamed article of an aromatic polyester, especially a large-sized foamed article of aromatic polyester having a high expansion ratio. The process comprises mixing an aromatic polyester, a polyepoxy compound, a compound of a metal of Group Ia, IIa or IIIa of the periodic table and a blowing agent in a melt extrusion molding machine optionally with a fibrous filler while introducing the blowing agent thereinto under pressure, extruding the molten mixture from the molding machine, further expanding the foamed unsolidified extrudate in an atmosphere maintained at reduced pressure, and solidifying it by cooling in an atmosphere maintained at reduced pressure. The resulting aromatic polyester foamed article has numerous fine cells having uniform volumes, shapes and distribution.

REFERENCES:
patent: 3704083 (1972-11-01), Phipps
patent: 3822331 (1974-07-01), Cogliano
patent: 3927160 (1975-12-01), Medley
patent: 3931379 (1976-01-01), Cruson et al.
patent: 4163037 (1979-07-01), Niznik
McKelvey; James M., "Polymer Processing", New York, John Wiley and Sons, .COPYRGT.1962, pp. 1-5.

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