Curable mixtures based on polyimides of unsaturated dicarboxylic acids and indole compounds
AssigneeCiba-Geigy Corporation
InventorAlbrecht Muller
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Abstract
Mixtures which can be cured to give crosslinked copolymerisates having valuable mechanical properties, characterized in that they comprise A. polyimides of certain unsaturated dicarboxylic acids, such as maleic acid or citraconic acid, B. indole or indole derivatives and optionally C. a curing catalyst.
Claims10
A curable composition of matter which comprises
- a. polyimides of the formula III ##STR7## in which A denotes a x-valent organic radical with 2 to 30 carbon atoms, R denotes hydrogen or methyl, and x denotes the number 2 or 3;
- b. indole or indole derivatives of the general formula II ##STR8## in which R.sub.1 denotes hydrogen, alkyl with 1 to 4 carbon atoms or acyl with 2 to 5 carbon atoms, and R.sub.2 denotes hydrogen or alkyl with 1 to 4 carbon atoms;
- and the ratio of components (a) and (b) being chosen to provide 0.005 to 1.0 mol of indole derivative (b) of formula II per each 1 equivalent of imide group in component (a).
A composition according to claim 11 wherein additionally 0.001 to 15% of a curing catalyst is present by weight of the total curable mixture, said catalyst being selected from the group consisting of Friedel-Crafts catalysts and basic catalysts, said basic catalysts being selected from the group consisting of primary, secondary and tertiary amines, quaternary ammonium compounds, alkali metal alcoholates and alkali metal hydroxides.
Dependencies are inferred from the claim text.