PIGMENTS | SPECIAL EFFECTS
the mechanical stress on the pigment itself — too high stresses can reduce the processing tempera- tures.”
Maile says that Zenexo GoldenWhite WB 21 YS
extends the potential colour palette with an elegant “champagne” colour mass tone. It is claimed to allow colourists to easily formulate in what he describes as a sensitive colour regime by mixing with the gold-coloured high chroma Zenexo GoldenShine 21 WB YY pigment.
Above: Colour wheel demon- strates the range available from Schlenk’s Zenexo pigments
Right: Schlenk’s Zenexo
pigments use the company’s UTP technology
inks, and plastic applications: GoldenShine WB 21 and GoldenWhite WB 21 YS. Further pigments will follow, according to Dr Frank J Maile, Global Technical Director BU Effect Pigments.
Right: Shepherd Color’s Starlight pigments are based on glass flakes with nano-coatings of silver
Ultra-thin substrates “Zenexo is based on UTP-Technology, which can be considered a breakthrough in effect pigment technology”, says Maile. UTP stands for Ultra-Thin- Pigment-Technology, which the company says is based on an ultra-thin aluminium substrate encapsulated with silica. Schlenk says the technol- ogy enables production of substrates with a reproducible and perfectly uniform thickness distribution and an unmatched aspect ratio. “For the first time, this new technology enables
effect pigments with excellent hiding power, superior flop, and unrestricted safety in terms of transport, storage, and use as a non-hazardous material in powder delivery form,” Maile says. A special surface treatment technology, called WB (which stands for water-borne), is said to enhance the good weathering and humidity resistance properties of Zenexo. Processing at temperatures of up to 260°C is
feasible and Maile says higher processing tempera- tures should also be possible “although this always depends on the respective parameter settings and
26 COMPOUNDING WORLD | March 2021
www.compoundingworld.com
Sparkling effects US-based Shepherd Color says its StarLight special effect pigments take their name from their ability to capture the sparkle of stars in the night sky. To produce them, the company takes flat borosilicate glass and breaks it into specific particle sizes. These glass flakes are then coated on all surfaces with a nano-scale layer of pure metallic silver. “This Micro-Mirror technology gives a much more crisp and distinct sparkle than even highly engineered aluminium flakes,” says Marketing Manager Mark Ryan. “Also, because an anti-tarnish treatment on top of the pure metallic silver totally passivates the StarLight particles, they are stable and highly weatherable.” StarLight is available in two product families. The
FL grades are based on five-micron thick particles, which are said to exhibit “excellent” sparkle in plastics applications and to show no tendency to form flow lines. StarLight FX grades are based on one-micron thick glass flakes and feature a smaller particle size distribution than the FL grades. These grades are optimised for thinner systems. Ryan says they “give a more demure and sophisticated look than the eye-popping FL grades.” Pearlescent effect pigments are most typically associated with consumer packaging and shelf
IMAGE: SCHLENK METALLIC PIGMENTS
IMAGE: SCHLENK METALLIC PIGMENTS
IMAGE: SHEPHERD COLOR
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