Production of foamed polymer structures

Details Production of foamed polymer structures Production of foamed polymer structures

1988-06-20

1989-04-18

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 54, 264DIG5, 521184, 521185, 521189, 521915, C08J 904, B29C 3512

Patent

active

048225371

ABSTRACT:
Described are ways of improving the yields of specification grade polyimide on a consistent basis from one run to the next, by use of improved microwave-based foaming processes. In one such process, during the application of the microwave radiation, the body of polyimide precursor and of the foam structure as it is developing therefrom are maintained under a substantially vapor-impermeable microwave-compatible shroud that does not substantially restrict or impede development of the foam structure; and the microwave radiation is directed upon the top, sides and ends of the body of polyimide precursor and of the foam structure as it is developing, but the extent to which such radiation impinges upwardly into the bottom of said body and said foam structure is curtailed, preferably by means of a metallic shield located below the precursor and developing foam structure. Mechanism by which the shields and shrouds function to provide the improvements of the process are discussed, and methods based thereon are set forth.

REFERENCES:
Gagliani, NAS9-14718, Final Report entitled "Fire Resistant Resilient Foams", (1975).
Gagliani, et al, NAS9-15050, Final Report, entitled "Development of Fire-Resistant, Low Smoke Generating, Thermally Stable End Items for Aircraft & Spacecraft", (1977).
Gagliani, et al, NAS9-15848, Final Report, entitled "Development of Fire-Resistant, Low Smoke Generating, Thermally Stable End Items for Commercial Aircraft & Spacecraft Using a Basic Polyimide Resin", (1980).
Gagliani, et al, NAS9-16009, Final Report, entitled "Formulation & Characterization of Polyimide Resilient Foams of Various Densities for Aircraft Seating Applications", (1981).

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