Process for producing aromatic polyimides
AssigneeRhodia Operations
InventorThomas Ternisien
Life of this patent
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Abstract
The invention relates to a process for producing an aromatic polyimide, comprising the following steps: (a) preparing one or more salt(s) by reacting one or more aromatic tetracarboxylic acid(s) in the solid state and one or more diamine(s), optionally in the presence of one or more chain limiter(s), in the presence of one or more binder(s), comprising one or more organic liquid(s), in an amount of from 1% to 25% by weight relative to the total weight of the aromatic tetracarboxylic acid(s), of the diamine(s) and of the optional chain limiter(s), then; (b) polymerising the salt(s) obtained in step (a).
Claims16
A process for manufacturing an aromatic polyimide, characterized in that it comprises the following steps:
- (a) preparation of one or more salts by reacting one or more aromatic tetracarboxylic acids in the solid state and one or more diamines, in the presence of one or more binders in an amount of from 1% to 25% by weight relative to the total weight of the aromatic tetracarboxylic acid(s) and the diamine(s), wherein the one or more binders is/are selected from organic liquids which do not react chemically with the aromatic tetracarboxylic acid(s) and the diamine(s);
- and then
- (b) polymerization of the salt(s) obtained in step (a).
Dependencies are inferred from the claim text.