Example 4
The mixture was composed of 790 parts Uralac® P 6401 (DSM), a saturated carboxylated polyester resin, 60 parts of TGIC (Huntsmann), 5 parts of Benzoin and 17 parts of charge control agent salicylic acid DL-N24 (Hubei DingLong Chemical Co., Ltd). This composition gave a transparent formulation. For different colours (Cyan, Magenta, Yellow, Black and White) 43 parts of Heliogen Blue K7090 (BASF) for cyan, 43 parts of Cinquasia Violet L5120 (BASF) for magenta, 137 parts of Sicopal Yellow L1100 (BASF) for yellow, 43 parts of Printex 90 BEADS (Orion Engineered Carbons) for black or 257 parts of TI Select TS6200 (DuPont) for white were added. All components were premixed in a high-speed mixer for 1 min and then extruded in a twin-screw ZSK-18 extruder. The compound obtained was then cooled down, granulated, fine ground and classified to obtain a powder having a D50 up to 12 μm if not otherwise described.
Hardening was done at a temperature of 200° C. for 10 minutes.