Ciba-geigy Corporation

Ciba-geigy Ag

Fridolin Babler

Hans Mollet

Roland Haberli

Gunther Zwahlen

Alberto Rabassa

A process for coloring linear polyesters in the melt in navy blue and dark blue shades, which process comprises using, as colorant, a mixture consisting of 0.2 to 1% by weight of perylenetetracarboxylic acid bis-methylimide, based on the amount of polyester, and a blue polymer-soluble colorant.

Process for the coloration of linear polyesters in the melt with

Perylenetetracarboxylic acid-bis-(3,5-dimethylphenyl)imide in a novel .gamma.-modification characterized by an X-ray diffraction spectrum exhibiting very strong lines at interplanar spacings of 8.3, 3.61, 3.46 and 3.30 A, and strong lines at interplanar spacings of 17.2, 10.3, 7.2, 6.7 and 4.09. The pigment is suitable for dyeing high-molecular organic material. Compared with the known yellowish-red modifications, the .gamma.-modification is characterized by a bluish-red shade.

Novel modification of perylenetetracarboxylic

Process for the preparation of opaque perylenetetracarboxylic acid bis-(3,5-dimethylphenylimide), which comprises heating the .alpha.-modification of perylenetetracarboxylic acid bis-(3,5-dimethylphenylimide) in at least one aliphatic monocarboxylic acid. Use as a pigment for plastic compositions, printing inks, fibres and paints.

Process for the preparation of opaque perylenetetracarboxylic acid

A process for converting a pigment or disperse dye into another modification by treating the colorant with a liquid alkylamine and removing the treatment agent by evaporation after the conversion into the modification. The pigments afforded by the instant process are used in the same way as the untreated colorants for pigmenting materials of high molecular weight.

Process for converting a pigment into another modification via liquid

A process for conditioning a pigment or disperse dye which comprises treating the colorant with liquid ammonia and results in an improvement of the dyeing properties and may be accompanied by a conversion into another modification. The pigments afforded by the instant process are particularly suitable for pigmenting material of high molecular weight.

Process for conditioning a pigment in liquid ammonia

A process for the manufacture of perylenetetracarboxylic dianhydride pigments having improved dispersibility, which comprises adding at least one primary aliphatic or cycloaliphatic amine containing at least 12 carbon atoms to an aqueous alkaline solution of an alkali metal salt or ammonium salt of perylenetetracarboxylic acid, acidifying the reaction mixture, whereupon the free perylenetetracarboxylic acid precipitates and is then converted by heating the reaction mixture into the dianhydride, which is isolated in the conventional manner.

Process for the manufacture of a perylene-3,4,9,10-tetracarboxylic

A process for pigmenting polyolefins and rigid polyvinyl chloride, which comprises the use of perylenetetracarboxylic acid diimide pigments of the formula ##STR1## wherein R.sub.1 represents an aliphatic or cycloaliphatic radical of at least 12 carbon atoms and R.sub.2 represents hydrogen or an aliphatic or cycloaliphatic radical. These pigments are exceptionally suitable for pigmenting polyolefins and rigid polyvinyl chloride.

Process for the mass pigmenting of rigid polyvinyl chloride and

A process for the mass coloration of linear polyesters wherein the colorant is a mixture of consisting of 0.05 to 0.35% by weight, based on the amount of polyester, of a thioindigo and/or dioxazine pigment and one or more polymer-soluble dyes which are different therefrom. Unexpectedly brilliant strong colorations of excellent lightfastness are obtained.

Process for the mass coloration of linear polyesters

The bis-(4,5,6,7-tetrachloroisoindolin-1-on-3-ylidene)-phenylene-1,4-diamine p igment in a new stable modification, characterized by an X-ray diffractogram of which the four strongest lines correspond to interplanar spacings between 9.1 and 9.0, 3.56 and 3.52, 3.41 and 3.37 and also 2.98 and 2.95 A, and having a greenish-yellow shade.

Stable modification of an isoindolinone pigment and processes for

Process for dyeing linear polyesters in the melt in brilliant deeply colored and highly light-fast dyeings, which process comprises using as dyeing agent a mixture consisting of 0.001-0.2% by weight, relative to the amount of polyester, of a perylene-3,4,9,10-tetracarboxylic acid derivative, and one or more dyes which differ from this derivative and which are soluble in polymers.

Process for dyeing linear polyesters in the melt

A novel process for the complete isolation and rapid drying of a solid, or mixtures of solids, from a suspension, is described in that there is added to the aqueous or organic suspension containing said solid an additional liquid, or a mixture of such liquids, which is a solvent for the solid contained in the suspension, and which liquid is insoluble, or soluble to only a limited extent, in the suspension liquid, in such a way that a multiphase system is formed; and the mixture is maintained in a state of intense turbulence until agglomerates of the solid are formed; and this is then seperated from the multiphase system and optionally dried.

Novel process for the complete isolation and rapid drying of solids from

A process for the manufacture of an easily isolatable, dustless, readily dispersible pigment granulate which comprises subjecting a suspension of a finely dispersed organic pigment or pigment preparation, in the presence of water-insoluble granulating assistants belonging to the class of natural, synthetic or semi-synthetic resins, esters of dicarboxylic acids, of arylcarboxylic acids, of arylsulphonic acids, of phosphoric and phosphorous acid, phenylsulphonamides or the alkaline salts of fatty acids containing 12 to 14 carbon atoms, but in the absence of wetting agents, in a two-phase system consisting of an aqueous phase and a second liquid phase which consists substantially of an organic solvent that is virtually insoluble in water and in which the granulating assistant is at least partially soluble, to a turbulent mixing until a granulate has formed, then isolating said granulate, which consists substantially of pigment or pigment preparation, granulating assistant and organic solvent, and removing the solvent therefrom.

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Allschwil, Switzerland

Fridolin Babler