Polymers possessing imide groups are disclosed. These polymers display good impact strength and are obtained by reacting:A. a bis-imide of the formula ##EQU1## in which Y represents a divalent hydrocarbon radical with 2 to 20 carbon atoms which is free from unsaturated bonds other than aromatic bonds, a divalent mono- or bis-heterocyclic radical with 2 to 10 carbon atoms, or a divalent organic radical with 4 to 20 carbon atoms consisting of several of the hydrocarbon radicals defined above connected to one another by --O--, --S--, --CO-- or --SO.sub.2 --, andB. either an adduct (A) obtained by reacting an epoxy resin and a polyamine of the general formula:Z(-- NH.sub.2 ).sub.v (II)in which Z represents an organic radical of valency v and v represents an integer at least equal to 2, or a mixture comprising the adduct (A) and an amine of the formula:X NH.sub.2 ).sub.m (III)in which X represents an organic radical of valency m and m represents an integer at least equal to 1, the proportions of the reagents being such that if n.sub.1 denotes the number of --NH.sub.2 groups of the polyamine of formula (II) and n.sub.2 denotes the number of epoxy groups of the epoxy resin, n.sub.3 denotes the number of carbon-carbon double bonds in the bis-imide of formula (I) and n.sub.4 denotes the total number of --NH.sub.2 groups in component b), the ratio n.sub.1 /n.sub. 2 is greater than 1 and the ratio n.sub.3 /n.sub. 4 is between 1 and 10. The polymers are particularly useful in the preparation of moulded and laminated articles.