Bayer Aktiengesellschaft

Gerhard Grogler

Richard Kopp

Heinrich Hess

Werner Rasshofer

Jurgen Schwindt

Andreas Ruckes

Holger Meyborg

Klaus Konig

Klaus Recker

Dieter Dieterich

Otto Ganster

Manfred Bock

Hans-Joachim Meiners

Paul Uhrhan

Helmut Hurnik

Gunter Arend

James M Barnes

Eduard Hansel

Gerd Reinecke

Wilhelm Kallert

Kurt Findeisen

Manfred Schmidt

Karlfried Wedemeyer

Thomas Scholl

Helmut Reiff

Walter Meckel

Artur Reischl

Josef Sanders

Ernst Grigat

Rudolf Hombach

Gerhard Balle

Manfred Dollhausen

Robert Eiben

Werner Mormann

Helmut Kleimann

Horst Stepanski

Hans-Albrecht Freitag

Geza Avar

Rainer Welte

Klaus-Peter Heise

Werner Clarenz

Holger Casselmann

Hans-Dieter Ruprecht

Ernst Meisert

Hermann Schafer

Karl J Kraft

Albert Awater

Johannes Koster

Hans-Jurgen Lienert

Lutz Georgias

Werner Drouve

Urs Thiery

Hans Tups

Hans D Thomas

Cornelius Muhlhausen

Max Mann

The present invention relates to a heat curable, one-component polyurethane reactive compositions containing

Heat curable, one-component polyurethane reactive compositions

Polyamines containing primary amino groups are made by hydrolyzing an isocyanate with water in the presence of a solvent which is a carboxylic acid amide. The solvent must be used in a quantity of at least 10% by weight solvent based on 100% by weight of isocyanate. The weight ratio of solvent to water must be from 3 to 200. A homogeneous phase is maintained during the hydrolysis which is carried out at temperatures of from 20.degree. to 210.degree. C. A not incorporable basic and/or metal catalyst particularly alkali metal hydroxides may be employed. The polyamines produced by this process are particularly useful for the production of polyurethanes.

Hydrolysis process for polyamines

The present invention is directed to novel urea group-containing polyisocyanates modified with long chain compounds having molecular weights of 400 to about 10,000. The present invention is also directed to a process for the preparation of modified urea group-containing polyisocyanates by reacting starting polyisocyanates which are free from urea groups with water to form urea groups in an inert reaction medium or in an aqueous mixture containing a dispersion stabilizer, wherein the starting polyisocyanates are mixed or reacted with long chain compounds having molecular weights of 400 to about 10,000 before the reacting the starting polyisocyanates with water and/or the long chain compounds are added to the inert reaction medium and/or to the water.

Urea group-containing polyisocyanates modified with long chain compounds

The present invention relates to a process for the preparation of a modified 1,5-naphthylene diisocyanate containing urea and biuret groups comprising reacting

Process for the preparation of highly elastic plastics

The present invention is directed to a polyurethane reactive adhesive compound comprising:

Polyurethane reactive adhesive compounds containing finely dispersed

The present invention is directed to a reactive polyurethane mixture comprising:

Polyurethane-based one-component reactive adhesives

The invention relates to a process for improving the flowability and preventing the agglomeration of finely divided dimerized 2,4-toluene diisocyanate in which a precipitated silicas and/or pyrogenic silica having a hydrophobic surface is added to the finely divided dimerized 2,4-toluene diisocyanate. The invention also relates to the finely divided dimerized 2,4-toluene diisocyanate prepared by this process.

Process for improving the flowability of dimerized

The present invention relates to heat-curable reaction systems prepared by mixing (a) solid polyisocyanates (optionally deactivated) having melting points above 80.degree. C., (b) OH- and/or NH.sub.2 -terminated polyoxyalkylene polyethers that have molecular weights of 400 to 10,000 and are liquid at room temperature, (c) solid OH- and/or NH.sub.2 -terminated polyesters that have molecular weights of 400 to 20,000 and are solid at room temperature, and which are thoroughly distributed throughout the mixture but are not homogeneously miscible with the polyether, (d) optional low molecular weight chain-extending agents that contain OH and/or NH.sub.2 groups and have a molecular weight of 62 to 399, and (e) optional catalysts and other auxiliaries. The invention further relates to a method for preparing elastomers, coating compounds, sealing compounds, or adhesives by heat-curing the heat-curable systems.

Heat-curing polyether-polyester-polyurethane ureas

The present invention thus relates to new compounds containing aminophenoxy end groups corresponding to the formula ##STR1## wherein R.sub.1 denotes an n-valent group as obtained by the removal of hydroxyl groups from an n-valent polyhydroxyl compound having a molecular weight of about 400 to about 12,000, preferably 400 to about 6,000,

Process for the preparation of aromatic polyamines

The present invention relates to the preparation of powdered heat-curable reaction mixtures in which melt suspension of (a) solid polyisocyanates having melting points above about 60.degree. C., (b) molten high molecular weight isocyanate-reactive compounds having molecular weights of from 400 to 10,000 that have melting or softening points of 50.degree. C. to 150.degree. C., and (c) optionally, solid or liquid low molecular weight chain-extending or crosslinking compounds having molecular weights of from 62 to 399, are added to an inert solvent containing an emulsifier, thereby forming powdered heat-curable reaction mixtures in which components (a), (b), and (c) remain in uncrossedlinked form. The invention further relates to the use of the heat-curing reaction mixtures for the preparation of high-quality polyurethane polyurea plastics.

Heat-curing reactive powders based on polyurethanes

This invention relates to a process for preparing polyurethane urea elastomers by reacting (a) compounds containing at least two isocyanate-reactive groups and having a molecular weight in the range from about 400 to about 10,000; (b) polyisocyanates; and (c) aromatic diamines corresponding to the formula ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen or alkyl.

Process for the preparation of heat-stable polyurethane urea elastomers

The present invention is directed to a process for the preparation of N,N'-bis-(3-aminophenyl)-ureas corresponding to formula (I) ##STR1## wherein R represents a linear or branched C.sub.1 -C.sub.6 alkyl group which is in the 2-, 4- and/or 6-position, characterized in that the corresponding phenylene diamines are reacted with urea in a molar ratio of greater than 2:1 in chlorobenzene as solvent.

Process for the production of N,N'-bis-(3-aminophenyl)-ureas

This invention relates to diaminoarylsulfones of the formula ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are independently C.sub.1 -C.sub.12 alkyl, that are useful as chain extenders in the preparation of polyurethane elastomers.

Diaminoarylsulfones useful for the preparation of polyurethane elastomers

The present invention relates to N,N'-bis-(4-isocyanatocyclohexyl)urea obtained from the reaction with water of cyclohexane-1,4-diisocyanate having a high trans isomer content. This invention further relates to the process for preparing the N,N'-bis(4-isocyanatocyclohexyl)urea and to its use in the synthesis of polyurethanes.

N,N'-bis(trans-4-isocyanatocyclohexyl)urea, a process for its

Polyurethanes containing uretdione rings are produced by reacting a polyisocyanate containing a uretdione ring with a relatively high molecular weight dihydroxyl compound in the presence of a bismuth salt of an organic carboxylic acid and a low molecular weight aromatic diamine. The low molecular weight aromatic diamine is used in a quantity which is 5 to 10 times the quantity of bismuth salt used. These solid polyurethanes are formed in relatively short reaction times and possess outstanding mechanical properties.

Process for the preparation of polyurethanes containing uretdione rings

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Leverkusen, Germany

Gerhard Grogler