Bayer Aktiengesellschaft

Agfa Gevaert Nv

Roderich Raue

Horst Harnisch

Hans-Peter Kuhlthau

Hubertus Psaar

Helmut Telle

Alfred Brack

Horst Berneth

Udo Eckstein

Karl-Heinrich Lange

Adolf Friedrich

Rudolf Schieder

Wolfgang Brinkwerth

Hans-Josef Buysch

Carl-Wolfgang Schellhammer

Harald Gleinig

Peter Ziemek

Klaus-Friedrich Lehment

Hans-Lothar Dorsch

Willi Eifler

Volker Huhne

Uwe Brinkmann

Wolfgang Huffer

Herbert Walther

Wolfgang Hartig

Herman J Uytterhoeven

Klaus Wunderlich

Siegfried Korte

Peter Wild

Karin Hassenruck

Karlheinrich Meisel

Hauke Furstenwerth

Dietmar Kalz

Gunter Franke

Heinz Giesecke

Karl Linhart

Matthias Kocher

Jurgen-Rolf Hassdenteufel

Dieter Ockelmann

Josef Finkel

Ernst-Heinrich Rohe

Fritz Peter Schafer

Dyestuffs of the formula ##STR1## in which D is the radical of an aromatic or heterocyclic diazo component and

Process for the preparation of dyestuffs

Dyestuffs of the formula ##STR1## in which D is the radical of an aromatic or heterocyclic diazo component and K is the radical of an aromatic or heterocyclic coupling component, or is the radical of an active methylene compound, are obtained in an ecologically advantageous manner by reacting an aromatic or heterocyclic diazo components of the formula

The new cationic triazatrimethine dyestuffs of the formula ##STR1## wherein the substituents B, Z, R.sup.2 and An.sup..crclbar. have the meaning given in the description, are suitable for dyeing and printing naturally occurring and synthetic materials.

Cationic triazatrimethine dyestuffs

New naphthalimides, useful as additives in toners for controlling the charge and conductivity, of the formula ##STR1## in which R represents C.sub.1 - to C.sub.22 -alkyl,

New naphthalimides, toners containing these and the use of the new

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

The new carbonylaminostyryls of the formula (I) ##STR1## in which the substituents R.sub.1, A, B and Z have the meaning given in the description, are especially suitable for the production of recording materials which can be used for pressure-sensitive copying, or of thermoreactive or electrochromic recording materials.

Carbonylaminostyryls

Thermal dye sublimation transfer recording element for receiving sublimable basic dye-precursors, comprising a support having thereon a dye-developing layer containing a dye-developing copolymer having sulfonic acid side-groups that can react with the basic dye-precursor to produce a dye image, characterized in that said dye-developing vinyl copolymer comprises plasticizing comonomers, the weight percentage of plasticizing comonomers in the dye-developing vinyl copolymer being such that the glass transition temperature of the dye-developing vinyl copolymer is between 30.degree. C. and 90.degree. C.

Thermal dye sublimation transfer recording element

Positively charged electrophotographic toners contain, besides customary resin and pigment particles, an additive which increases the cationic charge and has the general formula

Electrophotographic toners with cationic charge increasing additive

Process for the preparation of sulpho-free triphenylmethane dyestuffs of the formula ##STR1## in which R.sup.1 -R.sup.3 denote hydrogen, C.sub.1 -C.sub.6 -alkyl, preferably methyl, or halogen, preferably chlorine,

Process for the preparation of sulpho-free triphenyl-methane dyestuffs

The invention relates to positively charged electrophotographic toners which, in addition to customary resin and pigment particles, contain an additive which intensifies the cationic charge, of the general formula ##STR1## wherein R.sup.1 and R.sup.2 independently of one another represent H, C.sub.1 -C.sub.22 -alkyl, allyl, cyclohexyl, phenyl-C.sub.1 -C.sub.2 -alkyl or phenyl and

Electrophotographic toners with substituted

Heteropolyacid salts of the formula ##STR1## R.sup.1 and R.sup.2 independently of one another stand for hydrogen, chlorine, bromine, hydroxyl, C.sub.1 - to C.sub.4 -alkoxy, nitro or carboxyl,

Colorless salts of heteropolyacids as charge control substances in toners

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

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Leverkusen, Germany

Roderich Raue