Basf Aktiengesellschaft

Werner Langer

Bernd Bruchmann

Hans Renz

Wolfgang Heider

Roland Minges

Stefan Wolff

Dietrich Scherzer

Oral Aydin

Gerhard Auchter

Peter Keller

Friedhelm Lehrich

Ulrich Filges

Martin Reif

Michael Schiessl

G&uuml;nter Mohrhardt

Juergen Barwich

Klaus Vorspohl

Hermann Anders

Willy Van Pee

Joachim Jähme

Joachim J&auml;hme

Deitrich Scherzer

Arnold Schmitt

Werner Hofscheuer

A process for the preparation of polyisocyanates which contain one or more biuret groups, by reacting

Preparation of biuret-containing polyisocyanates

A process for preparing biuret-functional polyisocyanates from at least one aliphatic or cycloaliphatic diisocyanate and from at least one amine or water or a mixture thereof as reactants involves mixing the reactants with one another in a mixing unit having a high shear action.

Process for producing polyisocyanates containing biuret groups from (cyclo)aliphatic diisocyanates

The invention is to a process for the preparation of biuret-containing polyisocyanates by catalytic reaction of aliphatic and/or cycloaliphatic diisocyanates with a biuretizing agent, where the biuretizing agent employed is water in finely disperse form and the reaction is carried out in the presence of OH-acidic compounds.

Copolymers which are self-curable with atmospheric humidity and are based on acrylic, methacrylic and/or vinyl esters which have been prepared using silicon-containing regulators, and mixtures of such polymers with crosslinkers, are suitable as adhesive, sealing and coating compositions which are self-curable with atmospheric humidity.

Copolymers and mixtures which are self-curable with atmospheric humidity

Oligomeric carbodiimides having an average degree of condensation of from 2 to 30, obtainable by oligocondensation of

Oligomeric carbodiimides

Mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates (crude MDI) having a reduced iodine color number are prepared by reacting the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylene-polyamines with phosgene in the presence of one or more inert organic solvents at elevated temperatures by a process in which low molecular weight alkanols, polyhydric alcohols, preferably dihydric to octahydric alcohols having a molecular weight of from 60 to 350, or mixtures thereof are incorporated in an effective amount, advantageously in an amount of from 0.01 to 5% by weight, based on the weight of crude MDI, into the reaction mixture after the end of the phosgenation, the phosgene and the inert organic solvent are then separated off, from 0 to 5% by weight, based on the weight of crude MDI, of one or more phenol-based antioxidants and/or aryl phosphite are added to the reaction product, and the reaction mixture is subjected to a thermal treatment.

Preparation of mixtures of diphenylmethane diisocyanates and

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Ludwigshafen, Germany

Werner Langer