Bayer Aktiengesellschaft

Hans Theidel

Udo Eckstein

Peter Hartmann

Carlhans Suling

Joachim Konig

Friedhelm Muller

Alfons Dorlars

Otto Neuner

Jochen Koll

Hellmut Striegler

Klaus Kackstadter

Klaus Kackstaedter

Werner Bieber

Wolfram Von Langenthal

Fluorescent brightener salts of the formula ##STR1## in which A denotes the anion of an anionic cellulose fluorescent brightener,

Paper-coating slips containing fluorescent brighteners

Fluorescent dyestuffs of the formula ##STR1## wherein X and Y denote hydrogen, halogen, alkyl, aralkyl, alkenyl, hydroxyl, amino, alkoxy, aralkoxy, cycloalkoxy, aryloxy, alkylmercapto, alkylamino, dialkylamino, morpholino, piperidino, piperazino, pyrrolidino, acylamino or arylamino.

Fluorescent dyestuffs

Process for whitening textile fibres of polyesters or blended fibres of polyesters and cellulose or wool with dispers fluorescent whitening agents according to a combined exhaustion and thermo-fixing process, in the presence of auxiliaries e.g. esters in combination with water-soluble alkali metal salts or ampholytes which are capable of forming an aqueous two-phase system.

Process for the whitening of textile fibres of polyesters

Process for the whitening of polyester fibers or mixed fibers of polyesters and cellulose with dispersion fluorescence whitening agents by the pad-thermosol process in the presence of a water-soluble alkali methal tetraborate, alkali metal silicate, alkali metal aluminium sulphate, alkali metal polyphosphate or alkali metal sulphate.

Whitening of polyester fibers

Benzodifuran compounds of the formula ##SPC1## Wherein

Benzodifuran compounds

Compounds of the formula ##SPC1## Wherein R.sub.1 and R.sub.2 denote hydrogen, halogen, nitrile, alkoxy, alkyl, aryl, cycloalkyl, aralkyl, carboxyl or carboxylic acid ester groups are suitable for the optical brightening of synthetic organic high molecular materials.

Optical brighteners

A process for identifying manufactured articles in which a marking agent such as a homo- or copolymer of polymerizable ethylenically unsatured monomers is applied to the articles. Said homo- or copolymer contains at least one group which can be split off to form a low molecular weight compound such as an amine or phenol, which can be converted into dyes, said dyes being used to identify the manufactured articles.

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Leverkusen, Germany

Hans Theidel