PIGMENTS | BLACK AND WHITE
Above: Bayferrox 303 T from Lanxess enables
plastics to be identified using NIR detectors
employed for sorting
post-consumer waste
that is 20% higher than comparable pigments.” The company says that the reduced magnetic
properties of Bayferrox 303T also makes it a good option for colouring plastic packaging. Magnetis- able pigments can trigger false alarms from metal detectors used for product quality control processes in the food industry, for example, and this can disrupt production. “We have succeeded in synthesising a pigment
with an extremely low magnetic value,” says Bar- tolucci. “If you compare our Bayferrox 303 T with standard manganese ferrites, the magnetism has been reduced by more than 50%.”
Blue to brown Also targeting sorting improvements, Ferro offers its Nubifer NB-803K manganese ferrite black oxide PBk 33 pigment, which it says is opaque to visible light and has moderate NIR reflectance and has a bluish black shade. In addition, the company has a PBr 29 grade which shows hints of brown and blue — 24- 3950 FCP. It is described as a chrome iron brown hematite with high NIR reflectance. Both pigments received FDA clearance for use in food contact applications last year (they already had EU approval). Two years ago, Clariant (whose Pigments BU is
Right: Gabriel- Chemie’s carbon black-free NIR-sortable black master- batches carry COTREP certification
in the process of being acquired by Heubach) launched a number of NIR-detectable black pigments and dyes applicable to a wide variety of recyclable plastics. The range includes two poly- mer-soluble dyes: Solvaperm Black PCR for PET, PS, and PC packaging; and Polysynthren Black H for PC, PMMA, ABS, PS, PBT, PET, and PA packaging and E&E applications. The company also launched the Graphtol Black CLN pigment for polyolefins. Around the same time, BASF Colors & Effects
(now part of Sun Chemical) launched Sicopal Black K 0098 FK. Also designed to ease recycling of black plastics, the pigment can be used in food contact applications in several regions. Earlier this year, FDA food contact compliance was extended to cover microwave and oven-ready applications. Sicopal Black K 0098 FK has a slightly brown shade (Colour Index PBr 29).
18 COMPOUNDING WORLD | November 2021
www.compoundingworld.com
IR reflective Another recent introduction for infrared sorting is Shepherd Color’s Arctic Black 10P925, which is suitable for food contact applications. Described as an IR reflective jet black chromium iron oxide pigment pigment, it has a Colour Index of PBr 29. According to the company, it is suitable for use in packaging as well as wider plastics applications such as PVC building products, where its good solar reflectance and low heat build-up can be a benefit. Shepherd Color Marketing Manager Mark Ryan says the pigment also survives multiple extrusions.
Spanish company Al-Farben has developed
R-Black, which it says offers a good compromise between colour tonality, opacity, polymer compat- ibility, non-toxicity, and near-infrared (NIR) detection due to specific adjustment of its reflectivity. “The performance of R-Black has been tested at the main recycling manufacturer facilities in Europe using NIR spectroscopic techniques,” the company says. Masterbatch specialist Ampacet, meanwhile, has developed the Rec-NIR-Black masterbatch range. It says some products in the range have already received a positive technical advice from COTREP (Center of resources and expertise on the recyclability of plastic household packaging in France). Gabriel-Chemie has also extended its NIR-detectable black masterbatch product range with a COTREP certification. Sort is a new family of black masterbatches from Holland Colours that contain pigments or dyes that are compatible with NIR sorting. “It eliminates recycling headaches, while offering the same beauty and depth of colour,” says the company. According to Mark Kalisvaart, Holland Colour’s Global Product- Market Manager Additives, the company can develop grades with different tones, according to customer needs. He adds that it is continuing to develop the range, with what he describes as a num-
IMAGE: GABIEL-CHEMIE
IMAGE: LANXESS
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68
