Polyimide foam precursor and its use in reinforcing open-cell ma

Details Polyimide foam precursor and its use in reinforcing open-cell ma Polyimide foam precursor and its use in reinforcing open-cell ma

1988-06-22

1989-05-16

Foelak, Morton

Coating processes

Foraminous product produced

Filter, sponge, or foam

521 53, 521 54, 521126, 521127, 521157, 521183, 528 73, C08J 940

Patent

active

048308838

ABSTRACT:
Open-cell structures are filled with polyimide foam formed in place by the use of a foam precursor in powdered form comprised of a combination of (a) the reaction product of an excess of organic polyisocyanate and a member selected from the group consisting of furfuryl alcohol and condensation products thereof, and (b) an organic polycarboxylic compound containing two carboxylic anhydride groups. The precursor is prepared by combining the species under conditions which favor the reaction of the furfuryl alcohol with the polyisocyanate, but not the polyimide-forming reaction. The polyimide-forming reaction itself is then performed by adding preselected amounts of the powdered precursor, depending on the desired ultimate density of the foam, to each cell of the open-cell structure, then heating to initiate the polyimide reaction, and permitting the carbon dioxide generated by the reaction to escape while confining the resulting foam to the cells.

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patent: 4525386 (1985-06-01), Weisman
patent: 4663359 (1987-05-01), Rei
N. D. Ghatge et al., "Polyimides from Diisocyanates and Dianhydride", Jour. Polymer Science, vol. 18, 1980.
William M. Alvino et al., "Polyimides from Diisocyanates, Dianhydrides, and Tetracarboxylic Acids", Jour. Applied Polymer Science, vol. 19, 1975.
R. A. Meyers, "The Polymerization of Pyromellitic Dianhydride with Diphenylmethane Diisocyanate", Jour. Polymer Science, vol. 7, 1969.

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