Bayer Aktiengesellschaft

Agfa-gevaert Ag

Bayeraktiengesellschaft

Hubertus Psaar

Roderich Raue

Horst Berneth

Udo Eckstein

Siegfried Korte

Gunter Klug

Gert Jabs

Alfred Brack

Hans-Peter Kuhlthau

Anita Von Konig

Hans Hlschlager

Winfried Kruckenberg

Wilhelm Saleck

Karlheinrich Meisel

Edith Weyde

Thermoreactive recording material contains, as developer, a mixture of an acidic-modified polymer of (meth)acrylonitrile and/or methacrylonitrile and a diphenol of the formula ##STR1## in which Y is, for example, a single bond, an alkylene or alkylidene radical, gives, on thermal printing, a dye which has a reduced tendency to sublime.

Thermoreactive recording material

Compounds of the formula ##STR1## in which R.sup.1 /R.sup.2 are alkyl, cycloalkyl, aralkyl or alkylene,

Chromogenic enamine compounds, their preparation and use as color formers

Tetraindolyl-heptamethine derivatives of the isomeric formulae ##STR1## in which A, B, D and E denote ##STR2## and may be identical to or different from one another, and the other symbols have the meaning indicated in the description, are used in pressure-sensitive and heat-sensitive recording materials.

Tetraindolyl-heptamethine derivatives

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

Bis(indolyl)ethylenes of the formula ##STR1## wherein R.sub.1 denotes hydrogen, alkyl, aralkyl or aryl,

Bis(indolyl)ethylene compounds

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

A thermoreactive recording material contains a dyestuff precursor and an acid-modified polymer of acrylonitrile or methacrylonitrile and a 4-hydroxybenzoic acid ester as acceptor.

Bis(indolyl)ethylene aldehydes of the general formula ##STR1## in which R.sub.1 denotes hydrogen, alkyl, aralkyl or aryl,

Bis(indolyl)ethylene aldehydes

Bis(indolyl)ethylene process

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

A dry toner for developing latent electrostatic images in electrostatic recording and printing methods contains, as charge-control substance, a pigment of the formula ##STR1## in which A.sup.- represents an anion of a heteropolyacid based on tungsten and/or molybdenum with phosphorus, vanadium, cobalt, aluminium, manganese, chromium and/or nickel or a copper(I) hexacyanoferrate anion,

Dry toners containing fanal pigments based on cationic dyes

Dry toners for developing latent electrostatic images in electrostatic recording and printing methods contain, as charge-control substance, a pigment of the formula

Dry toners containing methinefanal pigments

A dry toner for developing latent electrostatic images in electrostatic copying and printing processes contains, as charge-control substance, a pigment of the formula ##STR1## in which A.sup.- represents a silicomolybdate anion,

Fanal pigments of closed-ring dry toners containing indamine-and

Compounds of the general formula ##STR1## wherein R represents hydrogen or alkyl and

1H-imidazo[2,3-a]indol-2-ones as 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, acrylamino, aralkylamino or arylamino and

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Leverkusen, Germany

Hubertus Psaar