pigments | Special effects
Right: Symic C 393 from Eckart is a highly chro- matic gold
shade offering high light
refraction and reflection
resist tarnishing and colour change. Starlight has been used in highly durable exterior applications and even maintains its sparkle when stored in water for years. This inertness also helped the FL105 grade to gain a Food Contact Notification for use in all polymers at up to 0.3%. Starlight products are so efficient that even a 0.1% loading creates a distinctive sparkle.” Silberline is combining advanced milling and carrier
technology to produce its high performance special effect pigments. “Current trends include fine, bright effects, particularly for engineering thermoplastics,” says Jeff Drusda, Technical Service Representative. “In addition, solutions for flow and weld line appearance are sought, whether the answer is a product or a technique. The main area of interest is overcoming flow and weld defects in injection moulded parts. New studies will begin soon to address these issues further.” The company says its TufFlake Premier pigments are
Below: PolyOne says its Impress metallic effect pigments help create attention-grab- bing packaging designs
engineered to enable metallic effect styling, new application designs and paint-replacement opportuni- ties for the plastics market. Processing options include injection moulding, blow moulding, film and sheet extru- sion and profile extrusion. The product offering includes flake sizes of 13, 18, 24 and 32 microns. All are provided in Silvet E1 granules and offered as solutions for maintaining brightness during aggressive processing as compared to conventional silver dollar flake grades. Extra Sparkle Silvet grades were developed to
provide alluring and novel aesthetics through the spherical shape of the aluminium pigment. “Moving from the traditional 2-dimensional ‘flake’ geometry to a 3-dimensional ‘sphere’ geometry provides stylists and formulators with a new approach for colour design,” adds Eric Ringan, Product Applications Technologist. “In addition, the Extra Sparkle Silvet series provide effects with a low-flow line appearance. The latest development is Extra Sparkle Silvet 600-10-E1 – a 20 micron spherical particle. Provided in Silvet E1 granules, they can be used as a solution for improving flow line appearance in injection moulded plastics.”
Transparent materials Eckart has developed Luxan K for use in transparent materials. The company says that the new range provides lustre in transparent packaging for food and cosmetics, and is also suitable for use in the
60 COMPOUNDING WORLD | March 2017
interior trim of automotive, household appliances, and sports and leisure goods. Eckart adds that the special features of Luxan K include high transpar- ency and brilliance. In combina- tion with dyes, in particular, they can offer added value for applications based on transpar- ent resins, such as PETG, glass polymer and Eastman’s Tritan copolyester. In addition to transparency,
Luxan K can create a 3D effect, providing the
impression that brilliance arises from below the surface. The pigment is also claimed to combine sparkling effects with high chroma and colour intensity. For packaging materials, this adds a luxurious lustre effect. In automotive applications, the pigments are suited to the high gloss “piano blacks” used in plastic interior trim. Luxan K is approved for food contact and is suitable for polyolefins, PVC and engineering plastics. The company has also extended its Symic series. Symic C 393 is a highly chromatic gold shade offering high light refraction and reflective properties – achieved using coating technology. It combines synthetic sheet silicate with customised metal oxides, with the result said to be colour purity and depth combined with brilliance and sparkling effects. The pigment is suitable for packaging applications including food and cosmet- ics, as well as for decorative purposes. German companies Grafe Group and Schlenk
Metallic Pigments have collaborated on a development project in which light reflections in many colours can shimmer on a plastic surface and create a hologram effect. Danny Ludwig, Director of the Grafe-Design- Center, says that previously it has not been possible to incorporate hologram effects in thermoplastics with higher processing temperatures. Schlenk has developed its MultiFlect holographic-
effect pigment to create diverse, stunning effects. Depending on the application and lighting, these range from a pearl shimmer to rainbow colours and can also include creating the illusion of depth. MultiFlect is manufactured in a special production process, normally used in the automotive sector for wheels paint and for decorative printing applications. It is a polychromatic pigment, whch means it generates a multi-coloured interference effect. “During processing, plastic is exposed to mechanical and thermal stresses, which previously prevented an appropriate pigment from being used. With our expertise in equipment and recipes, we have been able to achieve
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