Patent · US Expired

Polyetherimide foam precursors and foams having improved physical properties and methods of making them

US4980389A · kind A · utility

12Cited by

4References

12Claims

0Family size

Assignee

Irbit Research & Consulting AG · CH

Inventors

Francis U. Hill · San Diego, US
Paul F. Schoenzart · Leverkusen, DE
Werner Frank · Bensberg, DE

Key dates

Filing date	Apr 3, 1990
Grant date	Dec 25, 1990
Priority date	—
Expiry date	Apr 3, 2010

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G73/1053
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.