Abstract: Polymers possessing imide groups having excellent heat resistance and chemical inertness are disclosed. They are prepared by reacting cyanamide and a product possessing imide groups selected from:A. a bis-imide of the general formula: ##STR1## in which Q represents a divalent radical of the formula: ##STR2## WHEREIN Y represents H, CH.sub.3 or Cl and m is 0 or 1, and A represents a divalent organic radical containing 2 to 30 carbon atoms; andB. a mixture comprising a said bis-imide and a mono-imide of the general formula: ##STR3## in which Q is as defined above and R represents a hydrogen atom or a monovalent organic radical containing 1 to 20 carbon atoms.

Abstract: 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.