Example 6
The mixture was composed of 350 parts of UVECOAT 2100 (Allnex), an unsaturated polyester resin, 13 parts of photo initiators, 2 parts of Benzoin and 7 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) 18 parts of Sunfast Blue 15:4 (SunChemical) for cyan, 18 parts of Quindo Magenta (SunChemical) for magenta, 18 parts of Fanchon Yellow 180 (SunChemical) for yellow, 9 parts of NiPex 60 (Orion Engineered Carbons) for black or 110 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 140° C. for 2 minutes under UV light with a dose of 2.5 J/cm2.