ADDITIVES | PIGMENTS
Right: Spectra- Flex Illusion light diffusing pigment from Sun Chemical creates a frosted glass effect without need for mould surface treatment
regulatory pressures,” says Mark Ryan, Marketing Manager at Shepherd Color. One example of this push is the company’s
removal of nickel from the composition of its CI Pigment Green 50 (PG50), due in part at least to concerns in the EU. Pigment Green 50 is often used in place of green chromium oxide (PG17) because it is more chromatic and does not contain chro- mium. Shepherd Color’s Green 10G603 is free of both nickel and chromium and is literally “greener”. “It has an increased negative a* value that denotes how green in colour a pigment is,” explains Ryan. The company has also introduced several new pigment chemistries. Cobalt blue pigments are highly durable but have an absorption band in the infrared (IR) range that reduces their effectiveness in applications like “cool roofs”. An alternative developed by Oregon State University is yttrium, indium and manganese oxide; this “YInMn” Blue pigment has been commercialised as Blue 10G513 by Shepherd Color. Because the new pigment chemistry does not have an absorption band in the IR range, dark blue-coloured durable building materials can be produced that stay cooler when exposed to sunlight, says Ryan. Shepherd Color also added a new yellow – NTP
Below: The shift to electric vehicles will push demand for orange pigments capable of extended exposure to high temperatures
Yellow 10G155 – to its ultra-high performance NTP Yellow pigment line earlier this year. In the yellow colour space, lead chromates are being phased out of some formulas due to regulatory pressure. The company says it is quite a challenge to balance the opacity, durability, chromaticity, and economics they provided with other chemistries. The new NTP Yellow (PY 227), however, offers a bright chromatic colour, high opacity and durability. “The new yellow is closer to redder shades of bismuth vanadate (PY 184), but with higher temperature stability and resistance,” Ryan says. Shepherd Color has also improved its RTZ
Orange (PY 216) pigment to complement the NTP
Yellow. According to the company, Orange 10P340 displays a true orange colour by itself but can also be used to add redness (a* value) to colour matches without decreasing weatherability or heat stability.
Food considerations Pigment chemistries must also consider consumer safety and comfort, especially for food-contact packaging or toys, while displaying low odour and low volatile organic compounds (VOCs) is impor- tant in automotive interior and textile applications, says Marc Dumont, Industry Manager Pigments for Plastics at BASF. “More stringent regulations around the world, such as the Plastics Regulations EU 10/2011 and China GB 9685.2016, require additional assessment for NIAS [non-intentionally added substances] and their behaviour during plastics processing,” he says. BASF recently launched Irgazin Red K 3840 UP, a new addition to its diketo-pyrrolo-pyrrole organic pigment family, which offers high fastness to heat, light, chemicals and solvents. The product was developed by conducting a risk assessment for NIAS and implementing improved specifications to meet requirements for off-flavour in critical applica- tions such as water bottle caps. Along with sustainability, BASF sees demanding performance requirements and increasing colour brilliance as key trends. “The increasing use of decoration films in building and automotive industries will also add to the higher demand for high performance pigments and dyes. Additionally, the lightweighting and e-mobility trends [use] high heat engineering plastics that require durable pigments,” says Dumont. The company added two pigments to the
Lumina Royal family for use in applications includ- 16 COMPOUNDING WORLD | September 2019
www.compoundingworld.com
PHOTO: SHUTTERSTOCK
PHOTO: SUN CHEMICAL
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