Chain-extending nitrile end-capped polyimides

Details Chain-extending nitrile end-capped polyimides Chain-extending nitrile end-capped polyimides

1975-03-14

1977-11-29

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 47R, 260 47CZ, 260 47CP, 260 47UA, 260 49, 260 50, 260 65, 260 78TF, 260 78UA, 260 7841, C08G 7312

Patent

active

040605159

ABSTRACT:
Aromatic polyimides with nitrile end groups are chain-extended (molecular weight increased) by polymerization using Lewis acid salts as catalyst. Molecular weights are increased with little or no by-product formation. These polyimides can be shaped and formed prior to the polymerization.
The aromatic polyimides appropriate for chain-extending are formed by the reaction of aromatic dianhydrides, aromatic diamines and nitrile compounds such as aminobenzyl cyanide and aminobenzonitrile.

REFERENCES:
patent: 3864309 (1975-02-01), Bilow et al.
patent: 3890274 (1975-06-01), D'Alelio
patent: 3943107 (1976-03-01), Seltzer et al.

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