Bayer Aktiengesellschaft

Hans-Joachim Scholl

Dieter Dieterich

Rainer Welte

Josef Pedain

Hanns I Sachs

Armin Zenner

Helmut Reiff

Peter Markusch

Wilhelm Brandes

Paul-Ernst Frohberger

Klaus Grohe

Rolf-Volker Meyer

Gert Jabs

Bernhard Jansen

Volker Paul

Gunther Loew

Ingeborg Hammann

Erich Klauke

Kurt Findeisen

Hanns-Peter Muller

Martin Melchiors

Manfred Dietrich

Josef Sanders

Wieland Hovestadt

Peter Hohlein

Rudolf Fauss

Manfred Kapps

Gundolf Jacobs

Stefan Penninger

Gerhard Mennicken

Hans Hettel

Bernd Riberi

Helmut Woynar

Torsten Heinemann

Ferdinand Grewe

Klaus Jost

Mark R Kratz

Eberhard Kreiss

Peter Markush

Peter Heitk/a/ Mper

Hydroxy-functional polyurethane carbonates, a process for their preparation and their use as binders

A process is described for the preparation of stable, agglomerate-free, low-viscosity graft copolymer dispersions by the free-radical polymerization of olefinic monomers, such as styrene and/or acrylonitrile, with polyol compounds in the presence of a hydroxyl compound modified with castor oil. The use of these graft copolymer dispersions in the manufacture of polyurethane plastics, particularly flexible foams, by the isocyanate polyaddition process is also described.

Polymerizing monomers in presence of polyol and castor oil-polyol product

The present invention relates to a process for preparing polyisocyanates containing isocyanurate groups by trimerizing a portion of the isocyanate groups of an organic polyisocyanate component containing

Polyisocyanates containing isocyanurate groups and prepared by

The present invention relates to mixtures of cycloaliphatic diisocyanates corresponding to formula 1) ##STR1## wherein R represents a saturated, linear, aliphatic hydrocarbon residue having 8 to 15 carbon atoms. The present invention also relates to a process for the preparation of these diisocyanate mixtures and to their use for the production of polyisocyanate addition products.

Mixtures of cycloaliphatic diisocyanates, a process for their

Completely open-celled rigid polyurethane foams are produced by subjecting closed-celled or partially closed-celled rigid polyurethane foams to applied external pressure. These open-celled foams are useful as filling material in insulating panels or as insulating foams.

Process for the production of open-celled rigid polyurethane foams

Substantially closed-cell rigid foams containing urethane, urea and biuret groups are produced by reacting an NCO terminated prepolymer with a compound having at least two isocyanate-reactive hydrogen atoms and a molecular weight of from about 400 to about 10,000 in the presence of a catalyst and water by any of the known techniques. The NCO terminated prepolymer is the reaction product of x parts by weight of an at least difunctional polyol having an OH value of less than 100 with y parts by weight of an at least difunctional polyisocyanate. The ratio of x to y is at least 1:10. The product foams are particularly useful as insulating materials.

Process for the production of substantially closed-cell rigid foams

Organic carbodiimides are produced by carbodiimidization of isocyanate groups with catalysts of the phospholine type. At the end of the carbodiimidization reaction, the catalyst system is removed by introducing carbon dioxide in vacuo at temperatures of from about 100.degree. to about 250.degree. C. The carbodiimides produced by this process are particularly useful as stabilizers for plastics.

Process for the production of organic carbodiimides and their use as

A new process for the standardization and stabilization with simultaneous increase of reactivity of organic polyisocyanates and the polyisocyanates produced by this process. A polyisocyanate is mixed with compounds having at least one epoxide group which are represented by a specified formula. This mixture is then stabilized with a silylating agent and/or alkylating agent represented by specified formula. The polyisocyanate/epoxide mixture may optionally be heated before the stabilizing agents are added. These polyisocyanates are useful in the production of polyisocyanate addition products.

Process for the standardization and stabilization of organic

The present invention relates to a process for the conditioning and/or purification of organic isocyanates by

Process for the conditioning and/or purification of organic isocyanates

The present invention relates to a process for the preparation of oligomeric polyisocyanates in which

Process for the preparation of oligomeric polyisocyanates and their use

The present invention relates to dimerization catalysts which are suitable for the dimerization of organic isocyanates by heterogeneous catalysis, wherein the catalysts contain tertiary phosphines adsorbed onto adsorbent, porous carrier materials having a particle size (90%) of 0.1 to 10 mm, a pore volume of 0.4 to 1.4 ml/g, an average pore diameter of 5 to 50 nm and a specific surface area (BET) of 100 to 700 m.sup.2 /g. The present invention also relates to a process for the preparation of these catalysts by the adsorption of tertiary phosphines onto these carrier materials, optionally in the presence of inert solvents. Finally, the present invention relates to the use of these catalysts for the preparation of polyisocyanates containing uretdione and isocyanurate groups by the dimerization and trimerization of a proportion of the isocyanate groups of organic diisocyanates.

Process for the production of polyisocyanates containing uretdione and

The present invention relates to liquid storable organic isocyanates containing carbodiimide and/or uretone imine groups prepared by

Process for the preparation of liquid storable organic isocyanates

Rigid substantially closed cell foams are made by reacting an organic isocyanate with a mixture of high molecular weight polyols in the presence of water, a catalyst and other optional materials such as chain extenders, crosslinking agents and flameproofing agents. The reactants are used in quantities such that the isocyanate to hydroxyl group index is from about 90 to about 150. The mixture of high molecular weight polyols is composed of (1) a polyester having at least two hydroxyl groups and an OH number greater than 150 and/or a polyether having at least two hydroxyl groups and an OH number greater than 200 and (2) a polyether having at least two hydroxyl groups and an OH number below 100. The foams produced in accordance with this process are useful as insulating materials and as structural reinforcing materials.

Substantially closed-cell rigid foams containing urethane, urea and

The present invention relates to a process for the production of an isocyanurate group-containing polyisocyanate by

Polyisocyanates containing isocyanurate groups and a process for their

The present invention is directed to catalysts obtained by mixing alkali fluorides with quaternary ammonium or phosphonium salts. The present invention is also directed to a process for the production of these catalysts by stirring alkali fluorides and quaternary ammonium or phosphonium salts in alcohol, separating any deposits formed, removing the alcohol and converting the catalyst into useful form by dilution in solvents or absorption onto support materials. Finally, the present invention is directed to the use of the new catalysts as trimerization catalysts for the production of polyisocyanates containing isocyanurate groups.

New catalysts, their use for the production of isocyanurate

Growing community of inventors

Cologne, Germany

Hans-Joachim Scholl