Polyurethanes with reduced aldehyde emission

A process for the production of polyurethanes, the process comprising:

• mixing the following compounds to produce a reaction mixture:
• (a) polyisocyanate,
• (b) polymeric compounds having groups reactive toward isocyanates, the polymeric compounds being selected from the group consisting of polyether polyols, polyester polyols, and mixtures thereof with functionality from 2 to 8 and with number-average molar mass from 400 to 15000 g/mol,
• (c) catalysts,
• (d) a CH-acidic compound of the general formula (1):
• wherein
• H— is hydrogen,
• —X— is mutually independently one of oxygen and a —NH— group,
• -A- is mutually independently one of a linear-chain aliphatic, branched-chain aliphatic, and aromatic hydrocarbon moiety having from 2 to 20 carbon atoms,
• —O— is oxygen,
• S is one of an aliphatic, cycloaliphatic, aromatic, linear-chain hydrocarbon, and branched-chain hydrocarbon moiety which can have substitution, —C(O)— is a carbonyl moiety,
• —CH2— is a methylene moiety,
• R1 is mutually independently one of NO2 and an electron-withdrawing moiety of a general formula —C(0)—R2, and R2 is mutually independently a moiety selected from the group consisting of H, —NH2, —NH—R3—NR4R5, OR6 and R7, wherein R3, R4, R5, R6 and R7 independently are selected from the group consisting of aliphatic, araliphatic, and aromatic hydrocarbons, and
• l and n are mutually independently integers from 0 to 200,
• m is an integer from 0 to 7,
• o is an integer from 1 to 8, and
• p is an integer from 0 to 7,
• wherein the sum of m, o and p is not greater than 8;
• and
• allowing the reaction mixture to complete a reaction to produce the polyurethane.