Ciba-geigy Corporation

Volkhard Wiese

Andre Pugin

Bernhard Medinger

Albert Riegler

Werner Saar

Hans Harald Gehrt

Anton Elsener

Preparations which contain 10 to 70% by weight of a pigment or a polymer-soluble colorant and 90 to 30% by weight of a carrier mixture which is composed of 51 to 95% by weight of a metal salt of an aliphatic carboxylic acid containing at least 12 carbon atoms, said metal selected from the group consisting of calcium, barium, zinc, aluminum, and magnesium, and of 49 to 5% by weight of an elastomeric or thermoplastic polymer are useful for coloring molten thermoplastic polymers in level shades.

Preparations for coloring molten thermoplastic polymers

Process for dyeing thermoplastics having no reducing action, in which process there are used Mg, Zn, Cd and Ni salts of azo dye sulphonic acids of the formula ##STR1## wherein A represents a phenyl or naphthyl group optionally substituted by halogen atoms, by alkyl or alkoxy groups containing 1 - 4 C atoms, or by trifluoromethyl groups, X represents a hydrogen atom or a carboxy group, and n represents the number 1 or 2. The resulting dyeings are characterized by excellent fastness properties, especially fastness to light and to migration.

Process for the dyeing of thermoplastics

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.

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Pratteln, Switzerland

Volkhard Wiese