Production of foamed polymer structures

Details Production of foamed polymer structures Production of foamed polymer structures

1988-06-20

1989-02-14

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 53, 521 50, 521 505, 521183, 521184, 521185, 521189, 521915, B29C 3500

Patent

active

048045047

ABSTRACT:
Described are ways of improving the yields of specification grade polyimide foam on a consistent basis from one run to the next by use of improvements in microwave-based foaming processes. While a body of polyimide precursor is exposed to microwave radiation, the body of polyimide precursor and of the foam structure as it is developing therefrom are kept under a substantially vapor-impermeable microwave-compatible shroud that does not substantially restrict or impede development of the foam structure. For this purpose use may be made of a shroud composed of a polymer film. Mechanisms by which the shroud produces the improved results are discussed, and methods based thereon are set forth.

REFERENCES:
patent: 4305796 (1981-12-01), Gogliani et al.
patent: 4361453 (1982-11-01), Gogliani et al.
patent: 4439381 (1984-03-01), Gogliani et al.
patent: 4599365 (1986-07-01), Gogliani et al.
patent: 4708972 (1987-11-01), Long et al.
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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