Purification, impregnation and foaming of polymer particles with

Details Purification, impregnation and foaming of polymer particles with Purification, impregnation and foaming of polymer particles with

1990-07-02

1991-09-17

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 37, 264 53, 264DIG9, 521 58, 521 60, 528483, B29C 6722, C08J 918, C08J 922

Patent

active

050493280

ABSTRACT:
A process for making high-purity foam moldings without the use of organic blowing agents involves the use of inorganic gases such as carbon dioxide, nitrogen, air and other pneumatogens.
The process involves the simultaneous impregnation and purification of the polymers with or without foaming. If foaming is not done in the extractor, the polymeric particles can be foamed in pre-expanders or expanded and molded in downstream equipment.

REFERENCES:
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patent: 2531665 (1950-11-01), Booth
patent: 2848427 (1958-08-01), Rubens
patent: 3243485 (1966-03-01), Griffin
patent: 3953558 (1976-04-01), Hatano et al.
patent: 4695621 (1987-09-01), Allada
patent: 4703105 (1987-10-01), Allada
patent: 4911869 (1990-05-01), Meyer et al.
patent: 4925606 (1990-05-01), Francis

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