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COLOUR | PIGMENTS


Right: The high tinting strength of ultramarine pigments can be effective in enhancing aesthetics in PCR


purity. The Sunfast grades PB15:3 249-7900 and PG7 264-7700 are also said to be well suited for use with PCR, offering high tinting strength and easy dispersion. Likely moves to prolonged lifetime and reuse of plastics are also seen as opportunities for pigments that provide high heat fastness and weatherability at Ferro, according to Lladó. And, with the in- creased use of PCR, pigments will also be needed that can deliver more homogenous colours. Lladó says that Ferro’s ultramarine pigments can enhance the bluish under-shade of black or greys and avoid yellowness in whites or creamy shades, which is useful in homogenising the colour variation that might arise from different sources or batches of PCR. He says the company’s Nubiperf SRD ultramarine blue provides a high tinting strength with enhanced red undertones and is very effective in improving the aesthetics of recycled material.


Below: With an NIR reflectance of 20%, Bayferrox 303T Black allows waste sorting using NIR detection equipment


Sorting out NIR Another key aspect of recycling is the ability of black-pigmented materials to be sorted by resin type using near-infrared (NIR) scanners as conven- tional carbon-black pigmented plastics absorb infrared waves rather than reflect them. NIR or IR-reflecting or “NIR visible” black pigments have been introduced over the past few years as an alternative. In the US, the key driver for use of NIR-visible pigments is that black parts that cannot be sorted become a lower-value material stream. That is also a key driver in Europe, but the need for sortability is also embedded in the plastics packag- ing waste directive. Sun Chemical’s Kujat says that, European


regulations are increasingly covering more indus- tries and extending to environmental impact during manufacturing as well as at end-of-life. The need to redesign pigments used in packaging for NIR sortability is one result of this. The company’s Sicopal Black K 0098 FK (a former BASF brand) is


an inorganic black pigment intended for recycling with NIR detection. “We recently extended from 2% use level for conditions of use A-H to include condition J, opening the door for microwaveable and oven ready food packaging,” he says. Lanxess’s Bartolucci says the company’s


Bayferrox 303 T black pigment has an NIR reflec- tance of 20%, which enables efficient resin identifi- cation and sorting using NIR detectors. Demand for NIR sortable pigments is also seen as a developing trend at Shepherd Color. “We are seeing a lot of interest in this technology because of the increased focus on recyclability and sustain- ability,” says Ryan. The company offers Black 10P925 for deep black colour in virgin material and Black 10P950 for PCR, which needs higher colour- ing strength. “What we have been working on is the use of other pigments with these IR Black pigments to optimise the dark masstone colour,” he says. Meanwhile Ferro’s NIR reflecting pigments include Pigment Brown 29 (24-3950FCP) and Pigment Black 33 (Nubifer NB-803K FCP), which have both been approved by FDA as food-contact materials since June 2020, according to Lladó. He says current work in this area aims to improve performance of the pigments, such as through the addition of ultramarine blue (UMB) to increase jettness and add bluish shades (UMB is transparent to NIR and will not interfere with sorting).


CLICK ON THE LINKS FOR MORE INFORMATION: � www.heubachcolor.com � www.sunchemical.com � www.clariant.com � www.cornelius.co.ukwww.lanxess.com � www.shepherdcolor.com � www.ferro.com


24 COMPOUNDING WORLD | September 2021 www.compoundingworld.com


IMAGE: LANXESS


IMAGE: FERRO


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