Bayer Aktiengesellschaft

Lanxess Deutschland Gmbh

Agfa Gevaert Nv

Agfa-gevaert

Stephan Michaelis

Frank Linke

Peter Roschger

Hans-Ulrich Borst

Volker Hederich

Horst Berneth

Josef-Walter Stawitz

Dirk Pfuetzenreuter

Paul R Callant

Karin Hassenruck

Sabine Endert

Dietmar Kalz

Herman J Uytterhoeven

Ulrich Feldhues

Ralf Neigl

Friedrich W Krock

Christoph Thiebes

Meinhard Rolf

Karl-Heinz Reinhardt

Reinold Schmitz

Bernd Kaletta

Hauke Furstenwerth

Eberhard Kuckert

Luc Bastiaens

Guy Michel Van Ackere

Hermann Womelsdorf

Heinz-Josef Fuellmann

Bernd Woost

Gunther Franke

Josef Schroder

Heinz-Josef Fuellman

Heinz-Josef Füllmann

The present invention relates to novel methine dyes, methods for the preparation thereof and use thereof for dyeing plastics, especially polyamides, so as to obtain yellow to orange colourings with improved light fastness and improved thermal stability.

Methine dyes

The present invention relates to novel methine dyes, methods for the preparation thereof and use thereof for dyeing plastics, especially polyamides, so as to obtain yellow to orange colourings with improved light fastness and improved thermal stability. Methine dyes for example accord to the formula (I)  in which Ris hydrogen, halogen, alkyl, COOH or COOR, Ris oxygen or sulfur, Ris hydrogen, halogen, COOH, COORor CN, Ris alkyl or phenyl, Rand Rare each independently alkyl, Rand Rare each independently hydrogen, halogen, alkyl or COOR, and R, Rand Rare each independently alkyl.

Novel red methine dyes, methods for the preparation thereof, and use thereof for dyeing plastics, especially vinyl polymers, provide red colourings with improved colour strengths and improved colour brilliance.

The present invention relates to novel methine dyes, methods for the preparation thereof and use thereof for dyeing plastics, especially polyamides, so as to obtain yellow colorings with improved light fastness and improved thermostability.

Yellow methine dyes

Yellow metal azo pigments based on adducts of at least two metal azo compounds provide improved dispersion properties and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.

Metal azo pigments

The new metal azo pigments comprising the adduct of  

Metal azo pigments and pigment preparations produced therefrom

The use of fluorine-substituted perylenes in color filters for liquid-crystal displays is described.

Fluorine-substituted perylenes for colour filters in LCDS

Process for preparing compounds of the formula (I)where

Preparation of styryl dyes

A novel crystal form of C.I. Solvent Orange 60 gives a higher space-time yield in dye synthesis and is more easily finished.

Crystal form of a perinone dye

The invention relates to a light-protected electrochromic device containing a pair of glass or plastic sheets or plastic films. One side of at least one of said sheets or films, preferably both sheets or films, is provided with an electroconductive coating. At least one of said sheets or films and its electroconductive coating are transparent and the other can be metallized. The electroconductive coating of at least one of the two sheets or films can be divided up into separate, individually contacted surface segments. The sheets or films are joined by a sealing ring on the sides of their electroconductive coatings and the volume created by the sheets or films and the sealing ring is filled with an electrochromic medium. The invention is characterized in that the electrochromic device contains a yellow filter for which the wavelength at which absorbance in the long-wave flank reaches half of the very long-wave maximum absorbance value is between 370 and 500 nm, preferably between 380 and 470 nm. The invention is characterized by a considerably improved resistance to light in its activated state.

Electrochromic device with a yellow filter

Preparation of arylaminohydroxyanthraquinones

The present invention relates to a process for preparing compounds of formula (I) ##STR1## wherein A completes an unsubstituted or substituted heteroaromatic ring and

Process for the preparation of quinophthalones

Process for the production of cyanine dyes

The present invention relates to an infra-red laser sensitive thermographic material and to a process for forming a heat mode image using such a material.

Method and material for the formation of a heat mode image

Growing community of inventors

Odenthal, Germany

Stephan Michaelis