Additive composition and use thereof, condensation polymer composition, molding compound and molding compounds produced therefrom, and molded parts and use thereof

A method for increasing the hydrolytic degradation of a condensation polymer, the method comprising adding an additive composition comprising

• a) at least one hydroxycarboxylic acid salt and
• b) at least one organic phosphorus compound selected from the group consisting of
• wherein R1 at each occurrence is the same or different and is selected from the group consisting of linear or branched alky groups with 1 to 36 carbon atoms and aryl groups
• to the condensation polymer and the condensation polymer added with the additive composition is exposed to a hydrolysing condition,
• wherein the condensation polymer is selected from the group consisting of:
• polyesters of aliphatic or aromatic dicarboxylic acids and diols or of hydroxycarboxylic acids or their cyclic esters or diesters, and copolymers and mixtures or blends of two or more of the aforementioned polymers;
• polycarbonates or polyester carbonates;
• and mixtures, combinations or blends of two or more of the aforementioned polymers.