Method for preparing a polyurethane polymer

A method for preparing a polyurethane polymer, comprising

• (A) contacting of at least one isophorone diisocyanate (IPDI) monomer with at least one first polyol in the presence of at least one first catalyst to form a urethane prepolymer;
• (B) contacting of the urethane prepolymer with at least one second polyol in the presence of at least one second catalyst to form the polyurethane polymer;
• wherein:
• the first catalyst is selected from a catalyst of the general formula (I) or a catalyst of the general formula (II):
• wherein:
• R0 is a group containing from 1 to 10 carbon atoms, selected from an alkyl group, either linear or branched, or a cycloalkyl or arylalkyl group,
• R1, R2, and R3 each independently represent a group containing from 1 to 10 carbon atoms, selected from an alkyl group, either linear or branched, or a cycloalkyl or arylalkyl group,
• R4 represents a hydrogen atom or a group containing from 1 to 10 carbon atoms, selected from an alkyl group, either linear or branched, or a cycloalkyl or arylalkyl group,
• at least two of R1, R2, R3, and R4 being optionally elements of a ring, and
• M+ represents a monovalent cation;
• and
• the second catalyst is an (organic)metallic catalyst;
• or wherein:
• the first catalyst is an (organic)metallic catalyst;
• and
• the second catalyst is selected from a catalyst of the general formula (I) or a catalyst of the general formula (II).