Polyetherimide foam precursors and foams having improved physica

Details Polyetherimide foam precursors and foams having improved physica Polyetherimide foam precursors and foams having improved physica

1990-04-03

1990-12-25

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521182, 521183, 525179, 525183, 525188, 525351, 525353, C08G 6344, C08G 6944, C08G 7310

Patent

active

049803891

ABSTRACT:
A method of making polyetherimide foam precursors and flexible polyetherimide foams having improved specific tensile strength, resistance to high temperatures and flame, low density and flexibility at both high and cryogenic temperatures. 4,4'-oxydiphthalic anhydride (ODPA) is reacted with an alcohol to produce a diester, which is then reacted with a suitable monomeric polyamine such as meta phenylene diamine to produce a precursor. This material is dried to a solid block or powder. Upon heating, foaming occurs, resulting in a fine celled white friable mass. The foam is cured by heating for a suitable period and is ready for use.

REFERENCES:
patent: 3554939 (1971-01-01), Lavin et al.
patent: 4394464 (1983-07-01), Gagliani et al.
patent: 4407980 (1983-10-01), Gagliani et al.
patent: 4476254 (1984-09-01), Long et al.

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