Adducts, containing epoxide groups, based on polyesterdicarboxylic acids

An epoxide resin composition consisting essentially of advanced adducts containing epoxide groups, and advanced adducts being formed from ( 1) an adduct containing epoxide groups, which has been obtained by reaction of (a) a polyepoxide compound with (b) 0.3-0.5 carboxyl group equivalent, per 1 epoxide equivalent of the polyepoxide compound (a), of a long-chain aliphatic polyesterdicarboxylic acid of the formula I ##EQU1## wherein A denotes a long-chain polyester residue in which unsubstituted or substituted alkylene and/or alkenylene chains alternate with carboxylic acid ester groups and the quotient Z/Q, wherein Z is the number of carbon atoms present in the recurring structural element of the residue A and Q is the number of oxygen bridges present in the recurring structural element of the residue A, must be at least 4 and wherein, furthermore, the total number of carbon atoms present in the residue A is at least 50, and (2) 0.3-0.5 carboxyl group equivalent per 1 epoxide equivalent of the adduct (1) containing epoxide groups, of a polyester-dicarboxylic acid of the formula II ##EQU2## which is different from the polyester of formula I wherein R.sub.1 and R.sub.2 each is a member selected from the group consisting of divalent aliphatic residue, divalent araliphatic residue, divalent cycloaliphatic residue, divalent cycloaliphatic-aliphatic residue, divalent aromatic residue and divalent heterocyclic-aliphatic residue and at least one of the two residues R.sub.1 and R.sub.2 must contain a carbocyclic or heterocyclic ring or a ring system of this type and the recurring structural element of the formula ##EQU3## does not contain more than 3 methylene groups per ring and n denotes a number from 1 to 30.