Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Bayer Materialscience Ag

Markus Schürmann

Jens Krause

Stephan Reiter

Klaus Jurkschat

Gerrit Bradtmöller

Frank Richter

Stefan Lindner

Raul Pires

Axel Schmidt

Ljuba Iovkova

The present invention relates to new catalysts and production thereof as well as the preferred use thereof in the production of polyisocyanate polyaddition products. The described catalysts are tetravalent tin compounds with at least one ligand bonded via at least one oxygen atom or sulfur atom and containing at least one nitrogen atom.

Catalysts and use thereof in the production of polyurethanes

The present invention relates to the use of specific inorganic Sn(IV) for the production of polyisocyanate polyaddition products from a) at least one aliphatic, cycloaliphatic, araliphatic and/or aromatic polyisocyanate, b) at least one NCO-reactive compound, c) at least one thermolatent inorganic tin-containing catalyst, d) optionally further catalysts and/or activators other than c), e) optionally fillers, pigments, additives, thickeners, antifoams and/or other auxiliary substances and additives, wherein the ratio of the weight of the tin from component c) and the weight of component a) is less than 3000 ppm when component a) is an aliphatic polyisocyanate and less than 95 ppm when component a) is an aromatic polyisocyanate, wherein as thermolatent catalysts cyclic tin compounds of formula I, II or III:  wherein n&#x3e;1, are used.

Use of tin catalysts for the production of polyurethane coatings

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Recklinghausen, Germany

Markus Schürmann