Bayer Aktiengesellschaft

Bayeraktiengesellschaft

Udo Eckstein

Ulrich Feldhues

Roderich Raue

Hubertus Psaar

Uwe Vogt

Rolf Brockmann

Horst Harnisch

Hans Theidel

Gert Jabs

Siegfried Korte

Joachim Konig

Friedhelm Muller

Carl-Wolfgang Schellhammer

Fritz Puchner

Thomas Roick

Jochen Koll

G&uuml;nter Sackmann

Helmut Telle

Eckhard Wenderoth

Joachim K&ouml;nig

Rudolf Schieder

Wolfgang Brinkwerth

Detlef Szeymies

Bernhard Hunke

Edgar Siegel

Dietmar Fiedel

Matthias K&ouml;cher

Hans-Peter Geiger

Werner Bieber

Paper coating slips having high whiteness, high greying limit and high lightfastness can be prepared with the aid of whitened finely divided plastics.

Optically brightened plastics for optically brightening paper-coating compounds and paper-coating compounds optically brightened in this manner

Whitened polymers and the use thereof in coating slips for coating substrates

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

Color formers of the general formula ##STR1## in which --independently of one another-- R.sup.1 and R.sup.2 are hydrogen, halogen, alkyl, aralkyl etc.,

Triarylmethane color formers

Compounds of the general formula ##STR1## in which the symbols have the meaning given in the description, are highly suitable as color formers in recording materials based on acid developers. They give deep blue, green-blue, green, violet or red shades which have excellent sublimation and light fastness.

Bis(triarylmethane) compounds

Color formers of the formula ##STR1## in which X.sup.1 denotes hydroxyl, alkoxy, alkenyloxy, aralkoxy, cycloalkoxy, aryloxy or acyloxy,

Color-forming agents of the present formula ##STR1## wherein X denotes hydroxyl, alkoxy, alkenyloxy, aralkoxy, cycloalkoxy, aryloxy, acyloxy, alkylamino, dialkylamino, acylamino, aralkylamino or arylamino,

Triarylmethane color-forming agents

Highly concentrated stable solutions of color-forming agents of the general formula ##STR1## wherein x denotes hydroxyl, alkoxy, alkenyloxy, aralkoxy, cycloalkoxy, aryloxy, acyloxy, alkylamino, dialkylamino, acylamino, aralkylamino or arylamino and

Highly concentrated stable solutions of color-forming agent: for

Color-forming agents of the general formula ##STR1## wherein X denotes hydroxyl, alkoxy, alkenyloxy, aralkoxy, cycloalkoxy, aryloxy, acyloxy, alkoxycarbonyloxy, alkylamino, dialkylamino, acylamino, aralkylamino or arylamino,

Tri-phenyl methyl color-forming agents

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

Chromogenic phthalides of the general formula ##STR1## wherein R.sub.1 and R.sub.2 independently of one another denote hydrogen, alkyl, alkenyl, aralkyl, cycloalkyl or aryl or are linked to the ring A or B respectively in the o-position to the nitrogen and then represent the remaining members of a partially or fully hydrogenated heterocyclic 5-membered or 6-membered ring which can contain a further heteroatom from the series O, S, N--R.sub.1 or N--R.sub.2,

Chromogenic phthalides

Highly concentrated stable solutions of color-forming agents of the general formula ##STR1## wherein x denotes hydroxyl, alkoxy, alkenyloxy, aralkoxy, cycloalkoxy, aryloxy, acyloxy, alkylamino, dialkylamino, acrylamino, aralkylamino or arylamino and

Highly concentrated stable solutions of color-forming agents: for

Dyestuff laser consisting of a reservoir, with a laser dyestuff solution contained therein, and a pumped light source associated therewith, which is capable of exciting the dyestuff solution to produce an emission, characterized in that the dyestuff solution contains, in a solvent which does not interfere with the emission, a dyestuff which, in the form of the free acid, corresponds to the general formula ##STR1## wherein R.sub.1 to R.sub.4 independently of one another represent hydrogen, alkyl, trifluormethyl, alkoxy, aralkoxy, alkenyloxy, halogen or the carboxyl, cyano, alkylsulphone, aryl-sulphone, carboxamide, sulphonamide or carboxylic acid ester group,

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Cologne, Germany

Udo Eckstein