Patent ID: 6884854

Claim:
A thermally curable composition comprising: (A) at least one epoxy resin having on average more than one epoxy group per molecule; (B) a copolymer having a glass transition temperature of −30° C. or lower and epoxy-reactive groups or a reaction product of such copolymer with a stoichiometric excess of at least one epoxy resin according to (A); (C) at least one latent hardener activatable at elevated temperature, for component (A); and either (D) a reaction product obtained from a difunctional amino-terminated polymer and a tri- or tetra-carboxylic acid anhydride having on average more than one imide group and carboxyl group per molecule; or (E) a reaction product produced from a tri- or poly-functional polyol or a tri- or poly-functional amino-terminated polymer and a cyclic carboxylic anhydride, which reaction product contains on average more than one carboxyl group per molecule, or (F) a mixture of the reaction products according to (D) and (E).