Bayer Aktiengesellschaft

Rolf Brockmann

Ulrich Feldhues

Udo Eckstein

Uwe Vogt

Detlef Szeymies

Karl-Josef Herd

Hermann Henk

Frank-Michael Stohr

Wolfgang Zarges

Erwin Bacher

Manfred Hoppe

Bert Brassat

Karl-Rudolf Gassen

Clemens Casper

Karl-Heinz Schundehutte

Thomas Eizenhofer

Thomas Roick

Friedhelm Sahlmen

Karl-Heinz Rudolph

Hanno Henkel

Johannes O Sajben

Axel Lippert

Dietmar Fiedel

Walter Damsky

The invention relates to optical brighteners that possess at least one free SO H group and their use for whitening materials containing cellulose.

Process for preparing dyes and/or brightener formulations

Stilbene brightener

Process for the preparation of stilbene-disulphonic acids containing bis-alkoxy-triazinyl-amino, or derivatives thereof, characterized in that stilbene-disulphonic acids containing bis-chlorotriazinyl-amino, or derivatives thereof, are reacted with at least 10 molar equivalents, based on the stilbene-disulphonic acid compound, of a C,-C,-monoalkanol.

Process for preparing bis-alkoxy-triazinyl-amino-containing stilbene disulphonic acids or their derivatives

Process for preparing substituted 4,4'-diaminostilbene-2,2'-disulphonic

A process for the preparation of compounds of the formula (I) ##STR1## wherein n represents 0-2;

Process for the preparation of substituted

Dyestuffs of the formula ##STR1## in which the substituents have the meanings given in the description are suitable for the dyeing and printing of hydroxyl- and amido-containing materials.

Formazan dyestuffs

Reactive dyestuffs of the formula ##STR1## in which A=H, halogen, alkyl, alkoxy, acylamino or amino,

6-substituted sulphonyl-8-sulpho-2-naphthyl monoazo reactive dyestuffs

The gully closure for preventing the pollution of bodies of water in accident situations consists of a flexible mat (1) which covers the gulley surface and is coated with a highly viscous, free-flowing moulding composition (2). A plastically deformable silicone gel has proved particularly successful as a free-flowing moulding composition (2).

Gulley closure

The instant invention is directed to a process for stripping of a residual component from a liquid having a viscosity of from 300 to 10,000 poises in which the liquid flows in the form of a ring flow supported by a gas stream flowing in the core, through a tube into a separator vessel, the tube having a continuous coil shape and a conduit diameter to helix diameter of from 0.1:1 to 0.04:1, the improvement comprising adding to the gas stream from 10 to 90%, by weight, of externally generated steam and/or an inert gas at an adjusted pressure of from 50 m bars to 1 bar in the separator vessel for a gas and/or steam velocity in the tube of from 100 m/sec to the speed of sound. The added gas and/or steam generates thorough transverse mixing in the liquid ring flow.

Process for the removal of residual constituents

An improved process for the production of polyamides of low extract content by the activated anionic polymerisation of at least one lactam containing at least 5 ring members at temperatures above the melting point of the polyamide in a continuously working polymerisation apparatus, optionally followed directly by shaping, the improvement comprises treating the polyamide melt obtained by polymerising said lactam in said polymerisation apparatus with water or steam and subsequently freeing it from volatile constituents by evaporation before the polyamide melt is discharged into the open.

Process for the production of polyamides

Growing community of inventors

Bergisch Gladbach, Germany

Rolf Brockmann