Method for producing compounds having oxazolidinone groups

A process for producing moldings comprising oxazolidinone groups,

• wherein:
• a) polyisocyanate is mixed with
• b) at least one organic compound having two or more epoxide groups,
• c) at least one catalyst for the isocyanate/epoxide reaction, and
• d) optionally auxiliary and additive materials
• to form a reaction mixture, which is introduced into or applied to a mold and reacted to give moldings comprising oxazolidinone groups, wherein the at least one catalyst c) for the isocyanate/epoxide reaction comprises a compound of the general formula [M(R1)(R2)(R3)(R4)]+[X In]−, and wherein:
• M is a nitrogen atom or a phosphorus atom,
• R1, R2, R3 and R4 are each an organic radical, in each case selected independently of one another from the group consisting of linear or branched-chain alkyl radicals having 1 to 22 carbon atoms and being optionally substituted by heteroatoms or substituents comprising heteroatoms, and of alkyl-bridged cycloaliphatic or aromatic groups having 3 to 22 carbon atoms and being optionally substituted by heteroatoms or by groups comprising heteroatoms, and of aryl radicals having 6 to 18 carbon atoms and being optionally substituted by alkyl groups having 1 to 10 carbon atoms and/or heteroatoms,
• X is fluoride, chloride, bromide or iodide,
• I is iodine, and
• n stands for a rational number from 0.1 to 10.