Bayer Aktiengesellschaft

Bayer Corporation

Mobay Chemical Corporation

Rudolf Sundermann

Ernst Grigat

Gunther Rottloff

Rolf Putter

Klaus Konig

William E Slack

Kurt Findeisen

Rick L Adkins

Harald Horstmann

Siegfried Raddatz

Rudolf Fauss

Theodor Engbert

Peter Heitkamper

Friedrich Hoffmeister

Mithat Mardin

Thomas Schieb

Axel Vogel

Gerhard Wiechers

Friedrich Durholz

Wolf-Dieter Busse

Uwe J Zarnack

Gunter Hammen

Klaus Jost

Guido Skipka

Ulrich Kappler

Gernot Becker

Gunther Hammen

Process for the preparation of isocyanates

Ether-linked amine-terminated polyesters are produced by reacting (1) a polyester polyol in which substantially all of the hydroxyl groups have been replaced with good leaving groups with (2) an aminoalcohol and/or aminothiol and (3) a deprotonating agent. The aminopolyesters obtained by this process are characterized by excellent reactivities over a wide range of molecular weights and functionalities.

Ether-linked amine-terminated polyesters and a process for their

A continuous process for the preparation of isomeric mixtures of dinitrotoluene by a single stage nitration of toluene under adiabatic conditions. The reaction enthalpy is used for the removal by distillation of the water of reaction formed during nitration. In this process, toluene is reacted with a nitrating acid having from about 80 to about 100% by weight of an inorganic component having a specified composition and from about 0 to about 20% by weight of an organic component having a specified composition.

Process for the preparation of dinitrotoluene

The invention relates to pyrazolooxazines, pyrazolothiazines and pyrazoloquinolines defined herein by Formula I. The invention also includes compositions containing said Formula I compounds and methods for the use of said compounds and compositions for their lipoxygenase-inhibiting properties. Also included in the invention are methods for the manufacture of said compounds of Formula I.

Pyrazolooxazines, pyrazolothiazines, and pryazoloquinolines and their

A process for the preparation of N,O-disubstituted urethanes. Urea or polyurets, primary amines and alcohols are reacted at 120.degree.-350.degree. C. in the presence of N-substituted urethanes and/or N-mono- or N,N'-disubstituted ureas or polyureas. In a preferred embodiment, the reactants further include catalysts known to be useful in esterification of carboxylic acids. The urethanes produced in accordance with this process are particularly useful as starting materials for preparation of isocyanates.

Process for the preparation of N,O-disubstituted urethanes useful for

Polyisocyanates are prepared by thermally splitting a carbamate corresponding to the formula:

Process for the preparation of polyisocyanates

The present invention relates to novel, substantially insoluble and infusible plastics which are cross-linked by way of triazine rings and, optionally, by way of tri-substituted bis-oxymethylene urea groups or urethane groups.

Cross-linked plastics based on cyanic acid esters and method of

The instant invention is directed to storage stable liquid, partially carbodiimidized methylenebis(phenyl isocyanate) and to the method of manufacture thereof. The products of the instant invention are produced by heating methylenebis(phenyl isocyanate) at a temperature of from 150.degree. to 300.degree. C. in the presence of from 1 ppb to 10 ppm of a phospholine oxide catalyst. The reaction mixture is then cooled once the desired isocyanate content has been reached. The resultant product can be used to produce a variety of isocyanate-addition reaction products, including polyurethanes, polyureas and the like.

Preparation of partially carbodiimidized methylenebis (phenyl isocyanate)

Tris-(2-hydroxyaryl) esters of cyanuric acid, useful as cross-linking agents and UV absorbers, of the formula ##STR1## WHEREIN ##STR2## IS AN AROMATIC RADICAL WITH A HYDROXYL GROUP IN THE 2-POSITION TO THE ETHER OXYGEN,

Production of tris-(2-hydroxyaryl) esters of cyanuric acid

Non-inflammable, high molecular weight polytriazines are obtained by condensing less than 3 mols of polyfunctional (amino)phenols with 1 mol phosphorus (oxy) trihalide in the presence of a base, subsequently reacting the still free primary amino or phenolic hydroxyl groups with cyanogen halide in the presence of a base to form cyanamide or organic ester groups and polymerizing thereafter the reaction product at a temperature of up to 350.degree. C, optionally in the presence of polymerization promoters. The polytriazine may be used as plastics and lacquers.

Process for the production of non-inflammable polytriazines

Process for the production of polytriazines in the presence of

High molecular weight temperature-resistant polymers of polytriazine structure obtained by heating cyanamides of the formula I

High molecular weight polytriazines of soluble polymeric N-cyano-isourea

Aromatic cyanic acid esters having a free hydroxyl group which is not sterically hindered are prepared by reacting aromatic dihydroxy and polyhydroxy compounds with cyanogen halide in aqueous solution in the presence of a water-immiscible organic solvent and an inorganic base. Aromatic cyanic acid esters prepared by the process have the formula ##STR1## wherein Ar is optionally substituted aromatic and n and m are the same or different and are one of the numbers from 1 to 5, with the sum m and n being not greater than the number of replaceable hydrogen atoms in the radical Ar.

Aromatic cyanic acid esters

Polyfunctional aminophenols or amino(alkyl)phenols are converted with cyano halide in the presence of a base at temperatures below 65.degree. C into the corresponding aromatic cyanic acid esters containing cyanamide groups and thereafter at 65.degree. C to 150.degree. C into prepolymers which are soluble in organic solvents and highly stable in storage. The prepolymers may be converted into high molecular weight polymers of triazine structure by heating to 150.degree. C to 350.degree. C. The end products are insoluble in solvents and are infusible. The prepolymers may be used for the production coatings, shaped articles or laminates.

Process for the preparation of s-triazine prepolymers which comprises

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Leverkusen, Germany

Rudolf Sundermann