Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

Bernhard Medinger

Philippe Bugnon

Jost Von Der Crone

Zhimin Hao

Edward E Jaffe

Abul Iqbal

Olof Wallquist

Fridolin Babler

John S Zambounis

Fritz Herren

Eduard Troxler

Arnold Grubenmann

Volkhard Wiese

Werner H Dorfel

Abul Igbal

Jean Schaefle

Daniel Andrey

Hans Harald Gehrt

Anton Elsener

A process for the preparation of diazo pigment mixtures, which comprises condensing 2 mol of an azocarboxylic acid chloride of formula ##STR1## with 1 mol of a mixture of diamines of formulae ##STR2## at a molar ratio of II:III:IV from 0-30:5-60:40-95, the condensation and isolation of the product obtained being carried out by customary methods. The diazo pigment mixtures so obtained are distinguished by high color strength and chroma.

Process for the preparation of highly coloured diazo pigment mixtures

The invention relates to mixed crystals of 1,4-diketopyrrolo�3,4-c!pyrroles, consisting of 1 mol each of two different compounds of formulae ##STR1## as well as single-phase solid solutions of two different compounds of formulae I and II, wherein the diketopyrrolopyrrole having the smaller geometrical constitution is present in an amount of 53 to 70 mol %. A and B are as defined in claim 1. The novel mixed crystals as well as the novel solid solutions are admirably suited for pigmenting organic material of high molecular weight.

Mixed crystals and solid solution of 1,4-diketopyrrolopyrroles

The present invention relates to a process for the preparation of synergistic pigment mixtures by mixing solutions of at least two pigments solubilized by introducing carbamate groups, and subsequently precipitating the mixture in pigment form by subjecting said mixture to a thermal, photolytic or chemical treatment, either before or after incorporation in the substrate to be pigmented.

Process for the preparation of synergistic pigment mixtures

Organic pigments selected from the diketopyrrolopyrrole, azo, isoindolinone and isoindoline series, which pigments consist of 50% by weight of platelets which are from 5 to 50 .mu.m long, 2 to 50 .mu.m wide and 0.01 to 5 .mu.m thick, with the proviso that the ratios of length:thickness and width:thickness must be at least 3. The pigments in platelet form are excellently suited to producing effect colorations in high molecular weight organic material and in cosmetic products.

Diketopyrrolopyrrole pigments in platelet form

Novel compositions based on tetrachloroisoindolinone pigments

A composition containing an organic pigment, the particles of which pigment are provided with a tenacious, dense, highly crosslinked coating of ethyl cellulose. Pigment compositions of this kind are distinguished in particular by their color strength, by their excellent rheological properties in varnish and printing ink systems, by the high gloss of the finishes obtained therewith, and by the substantial non-deformation of the plastic mouldings pigmented therewith.

Organic pigments coated with crosslinked ethyl cellulose

Compositions containing an organic pigment coated with metal oxides, wherein the pigment particles are provided with a tenacious, dense, highly crosslinked coating of silica and/or alumina which is fixed by polycondensation of a silicate and/or aluminate with the free hydroxyl groups of a layer that densely coats the surface of the pigment particles and which consists substantially of partially hydrolyzed compounds of elements of group 4A or 4B of the Periodic Table selected from the group consisting of chelates of formula ##STR1## wherein R is methyl, ethyl, methoxy or ethoxy, R.sup.1 is methyl or ethyl and X is halogen or C.sub.1 -C.sub.4 alkoxy, and M is Ti or Sn, and of esters of formula

Organic pigments coated with metal oxides

Compositions containing an organic pigment coated with metal oxides, wherein the pigment particles are provided with a tenacious, dense, highly crosslinked coating of silica and/or alumina which is fixed by polycondensation of a silicate and/or aluminate with the free hydroxyl groups of a layer of ethyl cellulose that densely coats the surface of the pigment particles. Pigment compositions of this kind are distinguished in particular by excellent rheological properties in varnish and printing ink systems, by high gloss of the finishes obtained therewith, and by substantial non-deformation of the plastic mouldings pigmented therewith.

Organic pigments coated with metal oxides fixed with ethyl cellulose

Novel compositions based on isoindoline pigments

Novel compositions based on indanthrone blue pigments

A process for producing a granulate of difficultly fusible additives for plastics, particularly of pigments, by thermal tumbling granulation, which process comprises mixing the additive in powder form with a granulating auxiliary which softens between 30.degree. and 200.degree. C. and which has a particle size of 0.1-2.0 mm; and subjecting this mixture to a gentle rotary motion, with heating by means of a source of heat being simultaneously applied at least until softening of the granulating auxiliary commences.

Thermal tumbling granulation

A process for the distortion-free dope coloration of polyolefins with organic pigments, wherein the organic pigment is coated with a melamine-formaldehyde resin which is then cured.

Growing community of inventors

Giffers, Switzerland

Bernhard Medinger