Process for the production of polyamidocarboxylic acids

Details Process for the production of polyamidocarboxylic acids Process for the production of polyamidocarboxylic acids

1974-11-07

1976-09-21

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 465E, 260 47CP, 260 47P, 260 49, 260 65, C08G 7310

Patent

active

039818470

ABSTRACT:
A process for the producing a polyamidocarboxylic acid, or so-called polyamic acid, which is the prepolymer in forming a polyamide and which requires the reaction of a tetracarboxylic acid dianhydride with a diprimary diamine below about 50.degree.C. in an anhydrous, polar, aprotic organic solvent, characterized by an initial treatment of the dianhydride by only wetting with an inert organic solvent or by at least wetting this dianhydride with the polar, aprotic solvent and thereafter adding to the wetted dianhydride a solution of the diamine in the polar, aprotic solvent under thorough mixing, preferably within a very short period of time after treating the dianhydride. Stable polyamic acid solutions formed in this manner are useful intermediates in preparing films, filaments or other shaped polyimide products.

REFERENCES:
patent: 3190856 (1965-06-01), Lavin et al.
patent: 3542735 (1970-11-01), Lynch
patent: 3861956 (1975-01-01), Schwarcz

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