Patent ID: 7786222

Claim:
A polyamide oligomer with linear or branched chain structure with a number average molar mass of 800 to 5000 g/mol, with end groups which are formed partially by basic end groups which are at least partially NH 2 end groups, and CO 2 H end groups, produced by condensation of polyamide-forming monomers and an additional monofunctionally acting structural element, the polyamide-forming monomer including at least one of diamine and dicarboxylic acid or amino acid or lactam, and the additional monofunctionally acting structural element comprising at least one of amine or carboxylic acids, wherein 60 to 80% of the end groups are formed by the additional monofunctionally acting structural element, wherein the concentration of NH 2 end groups is at most 300 mmol/kg and the NH 2 end groups are present in excess in a ratio to the CO 2 H end groups, with the proviso that the sum of the NH 2 and CO 2 H end group concentration is smaller than the concentration of all end groups, and the condensation of polyamide-forming monomers and additional monofunctionally acting structural element avoids acetamide end groups.