Ambient cure polyimide foams prepared from aromatic polyisocyana

Details Ambient cure polyimide foams prepared from aromatic polyisocyana Ambient cure polyimide foams prepared from aromatic polyisocyana

1978-10-31

1980-01-15

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521114, 521119, 521120, 521129, C08G 1814

Patent

active

041840216

ABSTRACT:
Flame and temperature resistant polyimide foams are prepared by the reaction of an aromatic dianhydride, e.g., pyromellitic dianhydride, with an aromatic polyisocyanate, e.g., polymethylene polyphenylisocyanate (PAPI) in the presence of an inorganic acid and a lower molecular weight alcohol, e.g., dilute sulfuric acid or phosphoric acid and furfuryl alcohol.
The exothermic reaction between the acid and the alcohol provides the heat necessary for the other reactants to polymerize without the application of any external heat. Such mixtures, therefore, are ideally suited for in situ foam formation, especially where the application of heat is not practical or possible.

REFERENCES:
patent: 3620987 (1971-11-01), McLaughlin et al.
patent: 3644234 (1972-02-01), Grieve
patent: 3772216 (1973-11-01), Rosser
patent: 3849972 (1974-11-01), Pepmeier et al.
patent: 3865757 (1975-02-01), Wade

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