Thermal tumbling granulation
AssigneeCiba-Geigy Corporation
InventorsWerner H. Dorfel, Bernhard Medinger, Eduard Troxler
Life of this patent
Estimating the term…
Abstract
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.
Claims9
A process for producing a granulate of a difficultly fusible pigment additive for plastics by thermal tumbling granulation, which process comprises
- mixing the pigment, selected from the group consisting of azo, azomethine, anthraquinone, phthalocyanine, nitro, perinone, perylene, quinophthalone, dioxazine, thioindigo, iminoisoindolinone and quinacridone pigments, metal complexes of azo, azomethine methine dyes having pigment character, carbon black, titanium dioxide, iron oxide, lead chromates, and mixtures thereof, 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, selected from the group consisting of synthetic resins, semi-synthetic resins, natural resins, plasticizers, metal soaps and waxes, and
- subjecting this mixture to a gentle rotary motion with a peripheral speed of 0.3-2.2 m/sec, with heating by means of source of heat being simultaneously applied at least until softening of the granulating auxiliary commences.
Dependencies are inferred from the claim text.