Basf Aktiengesellschaft

Basf Se Corporation

Georg Henning

Peter Blaschka

Harald Arms

Wolfgang Lotsch

Arno Boehm

Willi Helfer

Arno Bohm

Erwin Hahn

Paul Guenthert

Arno B&ouml;hm

Bernhard Dung

Felix Mueller

Volker Weyrauch

Manfred Patsch

Gunther Lamm

Peter Erk

Hans-Juergen Degen

Georg Zeidler

Ortwin Schaffer

Michael Krapp

Manfred Mielke

Sigberg Pfohl

Michael Acker

Peter Hauser

Claus Hackmann

Josef Hetzenegger

Siegfried Mensch

Arno Böhm

Bertold Honigmann

Felix Müller

A process for preparing perylene-3,4:9,10-tetracarboxylic dianhydride, comprising: dimerizing a naphthalene-1,8-dicarboximide of the formula IIa; reoxidizing the resulting alkali metal salt of the leuco form of the perylene-3,4:9,10-tetracarboxylic diimide of the formula Ia; hydrolyzing the diimide to the tetraalkali metal salt of perylene-3,4:9,10-tetracarboxylic acid in the presence of an inert organic solvent, of an alkali metal base and of water; and subjecting the tetraalkali metal salt of perylene-3,4:9,10-tetracarboxylic acid to the action of an aqueous inorganic acid to convert it into perylene-3,4:9,10-tetracarboxylic dianhydride; wherein Ris cyclohexyl or phenyl which may each be substituted by up to three C-C-alkyl radicals, and the dimerizing is in a substantially homogeneous reaction medium consisting essentially of an apolar aprotic organic solvent and an alkali metal base.

Preparation of perylen-3,4:9,10-tetracarboxylic dianhydride and also of naphtalene-1,8-dicarboximides

A process for preparing perylene-3,4:9,10-tetracarboxylic diimides of the general formula I comprising in a reaction medium consisting essentially of an apolar aprotic organic solvent and an alkali metal base and subsequently reoxidizing the resulting alkali metal salt of the leuco form of the perylene-3,4:9,10-tetracarboxylic diimide in the presence of a polar solvent.

Method for the production of perylen-3,4:9,10-tetracarboxylic acid diimides and perylen-3,4:9,10-tetracarboxylic acid dianhydride and naphtalene-1,8-dicarboxylimides

A 1,7-disubstituted perylene-3,4,9,10-tetracarboxylic diimide of the general formula VI:

1,7-Diaroxy- or 1,7-arylthio-substituted perylene-3,4,9,10-tetracarboxylic acids, their dianhydrides and diimides

A 1,7-disubstituted perylene-3,4,9,10-tetracarboxylic diimide of the general formula VI

1,7-disubstituted perylene-3,4,9,10-tetracarboxylic acids, their dianhydrides and diimides

1,7-diaroxy- or 1,7-arylthio-substituted

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

N,N'-dimethylperylene-3,4,9,10-tetracarboxylic acid diimide pigments

Preparation of N,N'-dialkylperylene-3,4,9,10-tetracarboxylic acid

1,7-disubstituted perylene-3,4,9, 10-tetracarboxylic acids, their

Isoindolineazo pigments of the general formula I ##STR1## where A is the radical of an active-methylene compound or .dbd.S;

Isoindolineazo pigments

Pigment preparation with perylene derivatives as dispersants

Fluent dye preparations useful for dyeing leather or wool contain

Fluent polyazo dye preparations and method of dying leather or wool

The wet-end coloring of paper with pigments and fixers is carried out by a process in which the pigment and fixer are added simultaneously to the paper pulp to be colored, and the fixer used is a cationic fixer, in an amount of from 0.01 to 3% by weight, based on the dry paper pulp to be colored.

Coloring paper

A tetrachloroperylene-3,4,9,10-tetracarboxylic acid diimide pigment which contains not less than 85% by weight of the tetrachloro compound of the formula ##STR1## which is present to the extent of not less than 95% by weight in the .beta.-modification and which, in an X-ray spectrum, exhibits 2.sup..crclbar. CuK.sub..alpha. main lines at 9.0.degree., 13.3.degree., 15.0.degree., 16.8.degree., 19.1.degree., 21.5.degree., 24.2.degree., 25.4.degree., 26.5.degree., 27.0.degree. and 27.5.degree.. In finishes, the pigment gives very brilliant colorations which are very highly lightfast and fast to weathering and which, upon weathering, neither bleach nor darken up.

Tetrachloroperylene-3,4,9,10-tetracarboxylic acid diimide pigment and

Novel pigmentary forms of isoindoline pigments which contain

Transparent isoindoline pigment having a high color strength

Growing community of inventors

Ludwigshafen, Germany

Georg Henning