Method of preparing polyimide foam with excellent flexibility pr

Details Method of preparing polyimide foam with excellent flexibility pr Method of preparing polyimide foam with excellent flexibility pr

1999-06-23

2000-05-02

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521185, 521189, C08J 900, C08J 902

Patent

active

060573791

ABSTRACT:
A method of preparing polyimide foam produces a foam with excellent flexibility properties. The method of preparing polyimide foam is performed by foaming polyimide percursor which is prepared by employing linear aliphatic diamine and aromatic diamine containing 4 to 12 carbon atoms, at specific weight ration into the esterified reaction mixture prepared by reacting an aromatic carboxylic acid or its anhydride with excess amount of an alcohol compound. The polyimide foam produced by the method described retins superior characteristics of conventional polyimide foams and in addition have excellent flexibility so that it is used widely as adiabatic material, acoustical absorbent and cushion material in the aerospace industry, submarine and express trains etc.

REFERENCES:
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patent: 4656198 (1987-04-01), Shulman et al.
patent: 4670478 (1987-06-01), Shulman et al.
patent: 4897432 (1990-01-01), Lee et al.
patent: 4994501 (1991-02-01), Shulman

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