Process for preparing granules of pigments by means of...

B - Operations – Transporting – 29 – C

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B29C 47/00 (2006.01) B29C 47/50 (2006.01) C09B 67/02 (2006.01) C09B 67/08 (2006.01) C09B 67/20 (2006.01) B29C 47/38 (2006.01) B29C 47/40 (2006.01) B29C 47/80 (2006.01)

Patent

CA 2659546

A process for the production of a particle composition containing, at least one resin and at least one pigment is described, said process comprising the following steps : ~ extrusion of a mixture containing said at least one resin and said at least one pigment without induced heating; ~ subsequent extrusion, with induced heating, of the mixture obtained from the preceding extrusion; ~ granulation of the mixture thus obtained. With the abovementioned process it is possible to obtain a composition having granules with an average diameter less than 2 microns and a greater homogeneity than the known processes.

La présente invention concerne un procédé de production d'une composition particulaire contenant au moins une résine et au moins un pigment. Ledit procédé comprend les étapes suivantes : ~ extrusion sans chauffage d'un mélange contenant au moins ladite ou lesdites résines et au moins ledit ou lesdits pigments; ~ extrusion ultérieure avec chauffage du mélange obtenu lors de l'extrusion précédente; ~ granulation du mélange ainsi obtenu. Le procédé décrit ci-dessus permet d'obtenir une composition ayant des granules dont le diamètre moyen est inférieur à 2 microns et qui présentent une homogénéité plus grande que ceux obtenus par les procédés connus.

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