Lanxess Deutschland Gmbh

Bayer Chemicals Ag

Ronald Göbel

Ulrich Feldhues

Frank Linke

Udo Herrmann

Dirk Pfuetzenreuter

Sabine Endert

Dirk Pfützenreuter

Use of pigments of the formula (I) containing melamine as guest compound and having a dispersion harshness of more than 250 as pigments for color filters for liquid-crystal displays.

Organic pigments for colour filters

Process for preparing metal compounds of an azo compound which conforms in the form of its tautomeric structures to the formula (I) characterized in that the preparation takes place in the presence of seed crystals.

Process for preparing metal compounds of an azo compound in the presence of seed crystals

Process for preparing pigments of the formula (I) or tautomeric structures thereof and their hydrates, containing melamine as guest, characterized in that a mixture of the azobarbituric mono-cation salt (II) and the azobarbituric di-cation salt (III) is reacted with a nickel compound and melamine, in which cation1, cation2 and cation3 independently of one another are any desired univalent cations or the fraction of any desired multivalent cation that corresponds to a positive charge of one.

Process for preparing pigments

The present invention is directed to pigment formulations comprising at least one metal complex of an azo compound which in the form of its tautomeric structures generally conforms to the formula (I) The invention is further directed to processes for their production of the metal complexes and their use and particularly to color filters and the use of the color filters.

Organic formulations of pigment

Metal complexes of metals of the scandium group with an azo compound which conforms to the formula (I) or to one of its tautomeric structureswhere

Growing community of inventors

Leverkusen, Germany

Ronald Göbel