Granular pigments

C - Chemistry – Metallurgy – 09 – C

Patent

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Details

C09C 3/04 (2006.01) B01J 2/20 (2006.01) B01J 2/28 (2006.01) C09C 1/24 (2006.01)

Patent

CA 2308416

The present invention provides a method for the preparation of pigment granules that are readily dispersible, robust, and have a reduced liability to dusting, preferably without the use of substantial quantities of binder, if any at all. The method comprises mixing at least one pigment selected from the group consisting of iron oxides, chromium oxides, cobalt blues, mixed metal oxides, carbon blacks and titanium oxides, with water to form a mixture having a dough-like consistency. The mixture is then extruded through at least one die to form extruded granules, thereby also compacting the mixture, which increases the strength of the granules. The extruded granules are then dried so that the final water content of the granules is less than substantially 5 %.

Dans la présente invention, on divulgue une méthode pour préparer des granules de pigment pouvant facilement être dispersés, robustes, et peu aptes à se fixer aux poussières et contenant, de préférence, peu ou pas de liant. La présente méthode consiste à mélanger à de l'eau au moins un pigment choisi parmi le groupe constitué des oxydes de fer, des oxydes de chrome, des bleus de cobalt, des oxydes mixtes de métaux, des noirs de charbon et des oxydes de titane, pour former un mélange de consistance pâteuse. Ce mélange est ensuite extrudé dans au moins une filière pour obtenir des granules, le mélange étant ainsi compacté ce qui accroît la résistance des granules. Les granules extrudés sont ensuite séchés jusqu'à ce que leur teneur finale en eau soit sensiblement inférieure à 5 %.

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