Chain-extending Schiff base terminated polyimides and method of

Details Chain-extending Schiff base terminated polyimides and method of Chain-extending Schiff base terminated polyimides and method of

1975-05-27

1977-10-25

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 465E, 260 47UA, 260 49, 260 63P, 260 65, 260 78UA, 260 78TF, 260 7841, 428474, C08G 7310, C08G 7312

Patent

active

040555437

ABSTRACT:
Aromatic polyimides with Schiff base end groups are chain-extended (molecular weight increase) by heating the polyimides, preferably in the presence of Lewis acid salts as catalyst. Molecular weights are increased with little or no by-product formation. The 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 a Schiff base monoamine such as p-amino-benzylidene-aniline, p-amino-benzylidene-4-vinylaniline and p-aminobenzylidine-4-ethynylaniline.

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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