Basf Aktiengesellschaft

Max-planck-gesellschaft Zur Forderung Der Wissenschaften E.v.

Basf Coatings Ag

Basf Se Corporation

Peter Blaschka

Harald Arms

Norbert Schneider

Georg Henning

Arno Boehm

Peter Schuhmacher

Frank Meyer

Willi Helfer

Volker Richter

Wolfgang Best

Arno Bohm

Helmut Reichelt

Klaus Muellen

Peter Erk

Martin Koenemann

Harald Keller

Claudia Sierakowski

Arno B&ouml;hm

Anton Dotter

Dirk Hammel

G&uuml;nter Bettinger

Paul G&uuml;nthert

Peter Schlichting

Simone Schaefer

Erich Beck

Peter Hoffmann

Karl Siemensmeyer

Sylke Haremza

Albert Kohl

Raimund Schmid

Frank Prechtl

Helmut Steininger

Klaus Müllen

Claus Hackmann

Reinhold Rieger

Peter Heilmann

Robert Parker

Manfred Mielke

Paul Guenthert

Gerhard Berger

Martin Könemann

Matthias Krieger

Thomas Krüger

Thomas Frey

Ines Mangels

Hermann Bidlingmaier

Arno Böhm

Benno Sens

Tilmann Hezel

Günter Etzrodt

Paul Günthert

G&uuml;nter Smeyts

Zenon-Paul Czornij

A process for converting perylene-3,4:9,10-tetracarboximides of the general formula I in which Rand Rare each unbranched, branched or cyclic C-C-alkyl to a form suitable for use as fluorescent dyes, which comprises

Conversion of perylene-3,4:9,10-tetracarboximides to a form suitable for use as fluorescent dyes

A process for preparing perylene-3,4-dicarboximides which bear a sterically demanding substituent on the imide nitrogen atom by reacting a perylene-3,4:9,10-tetracarboxylic dianhydride with a sterically hindered primary amine in a substantially anhydrous reaction medium, which comprises undertaking the reaction in the presence of a tertiary amine, of a solvent based on a cyclic imine or amide and of a Lewis acid as a catalyst.

Method for producing perylene-3,4-dicarboxylic acid imides

Novel crystalline forms of and a process for converting perylene-3,4:9,10-tetracarboximide of the general formula I to a form used as a fluorescent dye. The process including: a) dissolving or suspending the perylene-3,4:9,10-tetracarboximide in a solvent to obtain a solution or suspension; and b1) cooling the solution obtained in step a) to a temperature at or below the crystallization temperature of the perylene-3,4:9,10-tetracarboximide and, if the solvent is organic, removing excess solvent until the first crystals form, otherwise, adding water or dilute aqueous solutions of the solvent until the first crystals form, and maintaining the solution at that temperature for further crystallization; or b2) cooling the suspension obtained in step a) to or below the crystallization temperature when the temperature in step a) was above the crystallization temperature, and maintaining the suspension at the temperature for further crystallization to form one or more solvate crystals.

Method for converting perylen-3,4:9,10-tetracarboxylic acid diimides into a form suitable for use as a fluorescent dye

A process for preparing quaterrylene-3,4:13,14-tetracarboximides of the general formula I in whichR, R' are each independently hydrogen or optionally substituted C-C-alkyl, C-C-cycloalkyl or aryl or hetaryl;which comprises reacting a perylene-3,4-dicarboximide of the general formula IIa in the presence of a base-stable, high-boiling, organic solvent and of an alkali metal base or alkaline earth metal base, with a perylene-3,4-dicarboximide of the general formula IIb in which X is hydrogen, bromine or chlorine.

Method for producing quaterrylene-3,4:13, 14-tetracarboxy diimides by direct synthesis

The current invention relates to a perylene-3,4-dicarboxylic anhydride, substituted in the 9-position, of the general formula III wherein Z is bromine or cyano, and processes for preparing 9-bromoperylene-3,4-dicarboxylic anhydride and 9-cyanoperylene-3,4-dicarboxylic anhydride.

9-cyano-substituted perylene-3,4-dicarboxylic acid monoimides

A 9-cyano-substituted perylene-3,4-dicarboxylic monoimide I where the variables are defined in the specification.

9-Cyano-substituted perylene-3, 4-dicarboxylic monoimides

Perylene derivatives of the general formula I where

Perylene-derivative based crystallization modifiers

The invention relates to a method of producing color pastes, in which a component comprising colorant particles is dispersed in a binder. In the method of the invention the dispersing operation is controlled by beaming excitational light of a defined wavelength range into a mixture of the component comprising colorant particles and the binder, detecting the light transmitted, reflected and/or scattered by the mixture and determining a sample spectrum, evaluating the sample spectrum and hence determining parameters of the color paste, and monitoring changes in the sample spectrum over time and terminating the dispersing operation when predetermined target parameters are attained.

Method for the production of dyestuff pastes

The invention relates to a cholesteric layered material with improved color shift stability.

Cholesteric layered material having improved color stability, and the production thereof

The invention relates to pyrazolone pigments of general formula (I), wherein the radicals R , R , R and R independently represent hydrogen, chlorine, methyl or ethyl, whereby at least one of the radicals R -R is different from hydrogen. The inventive pigments are characterised by a CIELAB colour angle of 80-85&deg;, a chroma of 58-62 and a luminosity &gE;87 (measuring angle 45&deg;, standard illuminant D65).

Transparent greenish yellow pyrazolone pigments

The present invention relates to novel cholesteric layered materials having the layer sequence A /B/A , where A and A are identical or different and each comprise at least one cholesteric layer, and B is at least one interlayer separating the layers A and A from one another, wherein layer B is an adhesive layer; cholesteric multilayered pigments which can be produced therefrom; a process for their production, and their use.

Cholesteric layered material, and the production thereof

Multilayer cholesteric pigments

Improved cholesteric special-effect layers are obtainable by comminuting cholesteric layers. These cholesteric layers are produced by applying at least one layer of a reactive, pourable cholesteric mixture to a moving substrate, by casting, and forming a solid cholesteric layer.

Coatings with a cholesteric effect and method for the production thereof

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Ludwigshafen, Germany

Peter Blaschka