Method for producing polyimides
AssigneeTechnische UniversitäT Wien
InventorsMiriam Margarethe UNTERLASS, Sebastian ESPANA-OROZCO
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Abstract
A method is provided for producing polyimides by polycondensation of previously produced stoichiometric salts from polycarboxylic acids or their polyanhydrides and polyamines by heating the salts for dehydration. In the method, a) an aqueous solution of a water-soluble stoichiometric salt is produced from polycarboxylic acid and polyamine; b) the aqueous solution undergoes a processing step; and c) the salt contained in the solution is simultaneously or subsequently polycondensed, by heating to form a polyimide.
Claims24
-16. (canceled)
1,3-Benzenedimethaneammonium-dihydrogen-3,3′,4,4′-benzophenonetetracarboxylate (1):
1,3-Benzenedimethaneammonium-dihydrogen-1,2,3,4-butanetetracarboxylate (2):
1,3-Benzenedimethaneammonium-dihydrogen-tetrahydrofuran-2,3,4,5-tetracarboxylate (3):
Ethane-1,2-diammonium-dihydrogen-3,3′,4,4′-benzophenonetetracarboxylate (4):
Ethane-1,2-diammonium-dihydrogen-tetrahydrofuran-2,3,4,5-tetracarboxylate (5):
Poly(N,N′-(benzene-1,3-dimethylene)tetrahydrofuran-2,3,4,5-tetracarboxylic acid diimide) (6):
- wherein n≥2.
Poly(N,N′-(1,2-ethylene)tetrahydrofuran-2,3,4,5-tetracarboxylic acid diimide) (7):
- wherein n≥2.
A method for producing polyimides from polycarboxylic acids or their polyanhydrides and polyamines by polycondensation of previously prepared stoichiometric salts by heating the salts for dehydration, wherein:
- a) an aqueous solution of a water-soluble stoichiometric salt of polycarboxylic acid and polyamine is prepared;
- b) the aqueous solution is subjected to a processing step;
- and
- c) the salt contained in the coating is simultaneously or subsequently polycondensed by heating to give a polyimide.
Dependencies are inferred from the claim text.