Catalysts and their use

A polyisocyanate polyaddition product with good mechanical properties, obtained from

• a) a polyisocyanate and
• b) a NCO-reactive compound
• in the presence of
• c) a latent catalyst
• d) optionally further catalysts and/or activators which differ from c)
• with the addition of
• e) optionally blowing agents
• f) optionally fillers and/or fibre materials
• g) optionally auxiliary substances and/or additives,
• wherein the latent catalyst c) comprises tetravalent mononuclear titanium, zirconium and/or hafnium compounds of the formula I having at least one ligand which is bonded via at least two oxygen or sulfur atoms and contains a single nitrogen atom
• Me(IV)(L1)n1(L2)n2(L3)n3 (I)
• wherein n1 is 1 or 2, n2 and n3 are 0 or 1, Me represents Ti, Zr or Hf and L1 represents a di-, tri- or tetravalent ligand and L2, L3 represent mono- or divalent ligands
• or tetravalent polynuclear titanium, zirconium and/or hafnium compounds based thereon, wherein at least one ligand per Me atom has the following meaning:
• —X—Y
• wherein
• X represents O, S, OC(O), OC(S), O(O)S(O)O, O(O)S(O)
• Y represents —R1-N(R2)(R3) or —R1-C(R4)=NR2
• wherein R1, R2, R3, R4 independently of each other represent saturated or unsaturated, cyclic or acyclic, branched or unbranched, substituted or unsubstituted hydrocarbon moieties which optionally contain hetero atoms, or R2, R3, R4 independently of each other represent hydrogen, R1-X, or R2 and R3 or R2 and R1 or R3 and R1 or R4 and R1 or R4 and R2 form a ring
• and —X—Y is bonded to an Me atom by at least two oxygen or sulfur atoms
• and wherein the remaining ligands independently of each other represent —X—Y with the abovementioned meaning or have the following meaning:
• halides, hydroxide, amide moieties, oxygen, sulfur or XR2.

A latent catalyst comprising tetravalent mononuclear titanium, zirconium, and/or hafnium compounds of the formula I having at least one ligand which is bonded via at least two oxygen or sulfur atoms and contains a single nitrogen atom, or di- or polynuclear tetravalent titanium, zirconium and/or hafnium compounds of the formulae II, III or IV having at least one ligand per metal (Me) atom which is bonded via at least two oxygen or sulfur atoms and contains a single nitrogen atom

• Me(IV)(L1)n1(L2)n2(L3)n3 (I)
• wherein n1 is 1 or 2 and n2 and n3 are 0 or 1, Me represents Ti, Zr or Hf and L′ represents a di-, tri- or tetravalent ligand and L2, L3 represent mono- or divalent ligands
• [(L1)n1(L2)n2Me(IV)]2O (II)
• wherein n1 is 1 and n2 is 0 or 1, Me represents Ti, Zr or Hf and L1 represents a di- or trivalent ligand and L2 represents a monovalent ligand
• [(L1)n1Me(IV)O]n (III)
• [(L1)n1Me(IV)S]n (IV)
• wherein n1 is 1, n is greater than or equal to 2, Me represents Ti, Zr or Hf and L1 represents a divalent ligand,
• wherein at least one ligand per Me atom has the following meaning:
• —X—Y
• Wherein
• X represents O, S, OC(O), OC(S), O(O)S(O)O, O(O)S(O)
• Y represents —R1-N(R2)(R3) or —R1-C(R4)=NR2
• R1, R2, R3, R4 independently of each other represent saturated or unsaturated, cyclic or acyclic, branched or unbranched, substituted or unsubstituted hydrocarbon moieties which optionally contain hetero atoms, or R2, R3, R4 independently of each other represent hydrogen, R1-X, or R2 and R3 or R2 and R1 or R3 and R1 or R4 and R1 or R4 and R2 form a ring
• and —X—Y is bonded to an Me atom by at least two oxygen or sulfur atoms
• and wherein the remaining ligands independently of each other represent —X—Y with the abovementioned meaning or have the following meaning:
• halides, hydroxide, amide moieties, oxygen, sulfur or XR2.