Bayer Aktiengesellschaft

Miles Inc.

Manfred L Gallus

Hans-Josef Buysch

Reinhard Langer

Otto Immel

Herbert Gebauer

Christine Mendoza-Frohn

Burkhard Lachmann

Christian Konig

Joerg-Dietrich Jentsch

Rudolf Uchdorf

Franz-Ulrich Von Gehlen

Franz-Moritz Richter

Bernd Weber

Harald Muller

Reinhold Wullner

William C Forester

Hermann-Josef Stupp

Isocyanates or isocyanate mixtures which are substantially free of color-imparting components are made by treating the isocyanate with hydrogen in the presence of a catalyst at a pressure of from about 3 to about 150 bar, a temperature of from about 100 to about 180.degree. C. for from about 15 minutes to about 4 hours. These isocyanates are particularly useful for the preparation of light-colored polyurethane rigid foams.

Process for the preparation of isocyanates or isocyanate mixtures useful

Production of aromatic amines by means of novel hydrogenation catalysts

Process for producing aromatic amines by gaseous phase hydrogenation

A mixer-reactor for mixing at least two fluid substances and carrying out or initiating a reaction between them, wherein the mixer-reactor consists of a substantially rotationally symmetrical casing containing a mixing chamber having separate inlets for the at least two substances and an outlet, the inlet for the at least first substance being provided within the axis of the mixing chamber and the inlet for the at least second substance being constructed in the form of a plurality of nozzles arranged rotationally symmetrically to the axis of the mixing chamber, characterized in that a bolt which is displaceable in the direction of the nozzle axis is allocated to each nozzle, wherein the bolt is acting to remove the caking or clogging material from the nozzle.

Mixer-reactor and process for containing nozzles for carrying out the

Isocyanates or isocyanate mixtures which contain no appreciable amounts of color causing materials are produced by phosgenating the amine corresponding to the desired isocyanate and treating the isocyanate-containing phosgenation mixture with hydrogen in the presence of a supported catalyst. The supported catalyst is in a form such that its shortest dimension is from about 0.3 to about 3.0 mm. This catalyst has a BET surface of from about 0.5 to about 150 m.sup.2 /g. No alkali material can be present in the catalyst. These isocyanates are particularly useful for the production of light-colored foams.

Process for the production of isocyanates and for the production of

A process for production of polyamines of the diphenylmethane series through a condensation reaction of aniline with formaldehyde in the presence of an acid catalyst, neutralization of the acid catalyst after reaction completion, and distillation of the resultant polyamine mixture is described. The key feature of the process is the abrupt increase in reaction temperature after the condensation reaction or after the first rearrangement step.

Process for the production of polyamine mixtures of the

A winding process for producing cheeses and cones for natural or synthetic drawn or undrawn filaments, wherein by controlling the traversing frequency DH of the traversing thread guide as a function of time or the radius of the cheese or the rotational speed of the cheese or equivalent parameters are at a constant ratio m'/k', where k' is the order of the ribbon winding and m' is the corresponding number of revolutions of the cheese, ribbon windings of the order k'&gt;2 are exclusively produced.

Method of avoiding or preventing low-order ribbon windings in the

Growing community of inventors

Dormagen, Germany

Manfred L Gallus