Ciba-Geigy Corporation

Ciba Specialty Chemicals Corporation

John Andrew Stirling

Carol Jean Farnocchi

Edward James Anderson

James M McCrae

Ian Alexander Macpherson

Ian R Wheeler

Brian Tuck

George H Robertson

George Heddle Robertson

Robert Bruce McKay

The present invention provides a novel polymorphic form of Colour Index Pigment Yellow 12 in a crystalline form which exhibits an X-ray diffraction pattern having three prominent X-ray diffraction lines corresponding to 'd' spacings of 11.82, 7.71 and 3.32.times.10.sup.-10 meters.

Pigment

The present invention provides a diarylide pigment composition which contains a long chain aliphatic primary amine having 10 to 24 carbon atoms; an ethylene polyamine of the formula

Pigment compositions

The present invention provides a pigment composition comprising a diarylide pigment, a monoprimary amine, a diprimary amine and an inorganic compound having active oxide or hydroxide surfaces.

Process for the production of a flocculation-resistant pigment, comprising after-treating an arylamide pigment which has been subjected to a dyestuff treatment, the after-treatment comprising a further treatment of the dyestuff-treated arylamide pigment with an arylamide yellow dyestuff, under alkaline conditions at elevated temperature.

Production of pigments

A process for producing a pigment or dyestuff composition in the form of dustless readily dispersible granules, which process comprises contacting, with agitation, an aqueous dispersion of a pigment and a composition comprising one or more organic acids which are liquid at temperatures below 100.degree. C. or their salts, at a pH value at which the acid is insoluble in water, the temperature being maintained during contacting above the melting point of the acid until the pigment has completely transferred into the organic phase; increasing the pH to a value suitable to render the acid soluble in water and recovering the resulting granules.

Process for the preparation of dustless, readily-dispersible pigment or

A process for the production of a pigment composition in bead form which comprises contacting with agitation, in the presence of an aqueous protective colloid, 1 part of a water insoluble carrier melting below 100.degree. C. and an aqueous dispersion containing 0.25-2,3 parts of a pigment or water insoluble dyestuff at a temperature above the melting point of the carrier and allowing the aqueous phase to become substantially free of pigment or water insoluble dyestuff by its association with the carrier and recovering the resulting pigmented beads which are easily dispersible in polymeric compounds to yield even colorations.

Process for the manufacture of a pigment composition in bead form

Pigment composition in the form of free-flowing, non-dusting, non-aggregating, non sticky generally spherical beads which comprises from 50 to 80% by weight of a pigment or water insoluble dyestuff from 5 to 40% by weight of a normally solid water-insoluble organic compound carrier or mixture of carriers melting below 100.degree. C, from 2.5 to 25% of an organic acid and from 1.5 to 25% of an organic base, the amount of acid plus base being from 5 to 35% by weight of the total composition in which are compatible with inks, paints and plastics, and can be readily incorporated into the same.

Growing community of inventors

Glasgow, United Kingdom

John Andrew Stirling