Chain-extending polyimides with aromatic polyisocyanates

Details Chain-extending polyimides with aromatic polyisocyanates Chain-extending polyimides with aromatic polyisocyanates

1975-03-14

1977-05-31

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 25N, 260 47CB, 260 47CP, 260 49, 260 63N, 260 65, 260 78TF, C08G 7310

Patent

active

040268330

ABSTRACT:
Aromatic polyimides with anhydride end groups are chain-extended (molecular weight increased) by reacting them with aromatic polyisocyanates such as tolylene-2,4-diisocyanate. These polyimides can be shaped and formed prior to chain-extending. Thermally stable, polyimide foams are formed by the reaction.
The aromatic polyimides appropriate for chain-extending are formed by the reaction of aromatic diamines with a molar excess of aromatic dianhydrides.

REFERENCES:
patent: 3300420 (1967-01-01), Frey
patent: 3505295 (1970-04-01), Grundsteidl et al.
patent: 3562189 (1971-02-01), Farrissey, Jr. et al.
patent: 3652500 (1972-03-01), Peterson
patent: 3663510 (1972-05-01), Peterson

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