| 摘要 |
The invention relates to a pigment-containing, thermosetting powder coating composition which contains at least one type of pigment having a special effect and is produced by blending comminuted particles of a thermosetting resin, a hardener, customary additives and fillers, and the said pigment or a preparation containing the pigment, subjecting the blend thus obtained to extrusion at elevated temperature and then carrying out a cooling operation to obtain an extrudate, followed by crushing, grinding and screening said extrudate to obtain the said powder coating composition, wherein the blend to be extruded further includes a resin-free carrier which protects the pigment having the special effect and is not agglomerated with the pigment. The said pigments, in particular, are the lamellar pigments such as metal flakes and mica pigments. The carrier protects the pigment during extrusion; it preferably has a softening point of at least 40 DEG C and at most 145 DEG C. Also described are a pigment preparation and a method for preparing it. |
