Bayer Aktiengesellschaft

Covestro Deutschland Ag

Bayer Materialscience Ag

Bayer Intellectual Property Gmbh

Wolfgang Friederichs

Stefan Lindner

Reinhard Strey

Thomas Sottmann

Agnes Dominika Chalbi

Elena Khazova

Verena Dahl

Diana Engelen

Lorenz Kramer

Stefan Wershofen

Hartmut Knofel

Klaus Schulte

Kurt Krippl

Meike Niesten

Stefan Penninger

Paul Heinz

Gunter Hammen

Stephan Moers

Hans-Ulrich Weber

Dirk Steinmeister

Uwe K&uuml;nzel

Juergen Straeter

Niels Becker

Jurgen Strater

Nils Becker

Jürgen STRÄTER

A polyurethane foam, polyisocyanurate foam or polyurea foam is obtainable from the reaction of a mixture comprising A) a compound reactive towards isocyanate ('NCO-reactive compound'); B) a blowing agent selected from the group comprising linear, branched or cyclic C1 to C6 hydrocarbons, linear,branched or cyclic C1 to C6 fluorocarbons, N, O, argon and/or CO, where the blowing agent B) is present in the supercritical or near-critical state; C) a polyisocyanate; D) an amphiphilic isocyanate; and E) optionally a surfactant and F) optionally other auxiliaries and additives. The invention further relates to the production of this polyurethane foam, where the blowing agent is emulsified in the isocyanate component containing amphiphilic isocyanate.

Polyurethane foam and process for producing same

The invention relates to a method for producing a polyurethane foam, wherein a mixture having the following is discharged from a mixing head through a discharge line: A) a component reactive toward isocyanates; B) a surfactant component; C) a blowing agent component selected from the group comprising linear, branched, or cyclic C1 to C6 hydrocarbons, linear, branched, or cyclic C1 to C6 fluorocarbons, N2, O2, argon, and/or CO2, wherein the blowing agent C) is present in the supercritical or near-critical state; and D) a polyisocyanate component. The component A) has a hydroxyl value=100 mg KOH/g and =1000 mg KOH/g. The blowing agent component C) is present at least partially in the form of an emulsion, and means provided with an opening or several openings are arranged in the discharge line in order to increase the flow resistance during the discharge of the mixture comprising A), B), C), and D), wherein the cross-sectional area of the opening or the sum of the cross-sectional areas of all openings is =0.1% and =99.9% of the inner cross-sectional area of the discharge line.

Polyurethane foam and method for producing same

The present invention relates to a process for producing a foamed material, wherein a composition in the form of emulsion with a matrix-forming component, a surfactant component and a near-critical or supercritical blowing agent component is submitted to a lowering of pressure. The blowing agent component further comprises a hydrophobic co-component, which is soluble in supercritical COat a pressure of &#x2267;150 bar, is insoluble in subcritical COat a pressure of &#x2266;40 bar and is insoluble in the matrix-forming component and furthermore is present in a proportion from &#x2267;3 wt % to &#x2266;35 wt % of the blowing agent component. It further relates to a composition in the form of emulsion to be used herein and a foamed material obtainable by the process according to the invention.

Process for producing a foamed material,composition in the form of emulsion used therein and foamed material obtainable therefrom

The present invention relates to a process for producing a polyurethane foam, where the blowing agent used is present in the supercritical or near-critical state. A reaction mixture is introduced into a closed mould, where the closed mould has been set up in such a way that its interior volume and/or the pressure prevailing in its interior can be altered after the introduction of the mixture by external influence. Through the selection of the surfactant it is possible to obtain microemulsions of the blowing agent in the polyol phase. The invention further relates to a nanocellular polyurethane foam obtainable by the process of the invention.

Process for producing a polyurethane foam by means of supercritical or near-critical blowing agent

Process for producing a polyurethane foam and polyurethane foam obtainable therefrom A process for producing a polyurethane foam with bimodal cell size distribution, comprising the following steps:

Process for producing a polyurethane foam and polyurethane foam obtainable therefrom

The present invention is directed to an agitator-free mixing head and a method for agitator-free production of a reaction mixture from an isocyanate and a higher-viscous polyol formulation, wherein both constituents are fed to a mixing zone and mixed with each other therein, whereby a polyol formulation with a viscosity of at least 3000 mPa.s is fed at low pressure into the mixing zone and at least two flows of low-viscosity constituents (isocyanate and optionally low-viscous polyol) are injected into the flow of high-viscous polyol formulation at high pressure.

Method and mixing head for producing a reaction mixture from an isocyanate and a higher-viscous polyol formulation

This invention relates to a process for the preparation of highly pure aromatic diurethanes and/or polyurethanes by reaction of the corresponding aromatic diamines and/or polyamines with unsubstituted carbamates with the release of ammonia. The reaction is carried out in the presence of excess carbamates. The resultant reaction mixture is freed from any solvents used, and the formed aromatic diurethanes and/or polyurethanes are purified by extraction with water.

Process for the preparation of highly pure aromatic diurethanes and/or

Polyisocyanate mixtures are isolated in pure or more concentrated form from isomeric mixtures by liquid-liquid extraction using a two-phase system. The two phases are 1) a non-polar solvent phase and 2) a polar solution in which a hydrogen halide is present. In a preferred embodiment, the extraction is carried out in a countercurrent extractor.

Process for isolating polyisocyanate isomers from polyisocyanate mixtures

The present invention relates to a process for the preparation of a polyisocyanate comprising

Process for the preparation of polyisocyanates

Growing community of inventors

Kö'ln, Germany

Wolfgang Friederichs