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MATERIALS | PIGMENTS


Above: Ferro has added two NIR-detectable black pigments to its product slate


sorting devices. They provide an alternative to carbon black, which normally cannot be recog- nised by NIR sorting scanners because it absorbs the radiation (it should be noted that carbon black producer Cabot says it is working with a number of partners to develop sorting technologies for post-consumer plastics capable of identifying materials containing carbon black). For packaging applications, Clariant says the


Graphtol Black CLN pigment is intended for polyolefins while Solvaperm Black PCR is devel- oped for PET, PS, and PC. Both are food contact approved in selected countries worldwide. Polysyn- thren Black H is intended for packaging and E&E applications using PC, PMMA, ABS, PBT, compact and expanded PS, as well as PET. “Of particular significance, Polysynthren Black H is one of very few colorants suitable for polyamides, the largest family of engineering plastics,” Clariant says. At Shepherd Color, Marketing Manager Mark


Right: Food trays pigment- ed with Sicopal Black pigment allow NIR sorting in recycling operations


Ryan says that to address sustainability and recycling issues, the company “has gone beyond the visual into the hyperspectral by using wave- lengths of light outside of our visual perception.” He says the company has applied its 40-years of experience in IR Black pigments to provide a highly effective solution to the challenge of sorting black plastics. Shepherd Color Black 10P925 is optimised for colouring black food trays, especially in polyole- fin resins, and has a dark, neutral mass tone colour. The Black 10P925 product is designed for virgin plastics; the company has developed Black 10P950 for post-consumer recyclate. “PCR can come in a range of colours and Black 10P950 provides high colouring strength to help overcome the inherent colour while still maintaining the NIR visibility properties needed to allow the material to be sorted again,” says Ryan. Both are said to be highly inert, inorganic pigments that are heat stable and non-migratory in a wide range of plastics. The company also says they will not degrade or change colour over multiple extrusions, and hold a wide


36 COMPOUNDING WORLD | September 2020


range of regulatory approvals around the world. Ferro has also introduced new NIR-detectable black pigments for packaging applications. Its inorganic pigments 24-3950 FCP (PBr29) and Nubifer NB-803K FCP (PBk33) are formulated to reflect light from the emitter, allowing recycling system sensors to correctly identify and sort the plastic. Developed over two years, the NIR reflect- ing blacks are part of the company’s food contact plastics product range, which includes European AP89(1) certification for each lot and compliance with the requirements of EU 10/2011 regarding plastic packaging in contact with food. They also carry FDA approval (FDA 21 CFR 178.3297) for use at up to 5% based on final formulation. BASF Colors & Effects recently-launched Sicopal Black K 0098 FK. It was developed to optimise the recycling of black plastics, particularly packaging, and has now received food contact approval in both Europe and the US. The company says compliance will be extended in the near future to include other regions. Within the AF-Color branch of independent compounder Akro-Plastic, the portfolio of master- batches has also been extended to include carbon black-free color formulations. These are marketed under the AF-Color IR name.


Cool solutions Taking another angle on black and NIR, Lanxess has developed a black pigment that it says reflects 20% more of the sun’s near-infrared radiation (NIR) than conventional products. Plastic roofs and façade elements that are coloured with Bayferrox 303 T heat up less when exposed to solar radiation, meaning that the building’s internal environment can be kept cooler. “The temperature in a polymer matrix coloured with Bayferrox 303 T is as much as 8°C lower than when a conventional black pigment is used,” says Stefano Bartolucci, Global Market Segment Manager for Plastics in the company’s


www.compoundingworld.com


IMAGE: ISTOCK/FERRO


IMAGE: BASF COLORS & EFFECTS


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