COLOUR | PIGMENTS
Right: Lanxess is increasing production capacity for Macrolex soluble organic dyes
beginning of September, Dr Christof Kujat, New Business Development – Global Industry Manage- ment Plastics, introduced no fewer than three new developments in this area: an inorganic red, a heat-stable red for polyamide, and two DPP reds that fulfil purity demands in applications such as mineral water bottle closures. Highly durable inorganic red pigments are
either rather orange in colour, low in chroma or suffer from a bad toxology profile, he said. An experimental BASF pigment, PR 290, based on a new chemistry, is more chromatic than iron oxides and more red than Sn/Zn/Ti oxide (PO 82). It is also stable at temperatures over 350°C. A new heat-stable red for polyamides, Cinquasia
Rubine K 4370 FK, expands the colour space into the medium red area and has high hiding power (Figure 1). It has very good dispersibility and very good lightifastness, and is also FDA compliant. Finally, Irgazin Red K 3840 UP and a low-warp version 3840 LW are described as control refined products, with strict specifications to NIAS (non- intentionally added substances) for off-flavour sensitive applications.
More colour capacity Lanxess, also a major colour supplier, said in February that it would increase capacity for Macrolex dyes by 25% at its Leverkusen site in Germany. The extra capacity is intended to be available from the end of this year. Philipp Junge, Head of Lanxess’s Rhein Chemie business unit, says the company sees a significant increase in demand for high quality dyes for plastics, especially in Asia. Macrolex soluble organic dyes are primarily used for the coloration of products such as
beverage bottles, electronic devices, car taillights and children’s toys. They are used for colouring styrenics, polycarbonate, PET, and acrylic (PMMA). Dominik Risse, who is responsible for Lanxess’s Colorant Additives Business, says that because regulatory requirements are becoming stricter, especially in sensitive application areas, demand is growing for products with high purity, “for which Lanxess is the market leader.”
Figure 1: BASF’s Cinquasia Rubine K 4370 FK expands the colour space for polyamide (calculated for L* = 40 -) Source: BASF
22 COMPOUNDING WORLD | September 2018
Liquid colours Companies introducing new liquid colourants include Toyocolor and Riverdale. Toyocolor, a Toyo Ink Group company, is launching liquid colour masterbatches into its Lioplax family of colorant solutions this autumn. It says a full range of colour and effect masterbatches are available for PET/PC applications. They include grades blended with organic and inorganic pigments and dyes, and special effect formulations incorporating pearl pigments and additives that enhance surface appearance. They are said to be easily incorpo- rated into transparent or translucent polymers, with typical target applications in beverage, cosmetics, beauty care and household goods. The new line-up is formulated using Toyo’s nano- scale liquid and solid dispersion technologies, which enable them to maintain a high level of reflectivity in pearl pigments. “Moreover,” says a representative, “Toyocolor researchers succeeded in dispersing functional nanofillers in the polymer matrix – a feat that is difficult to accomplish with conventional pellet concentrates. Excellent performance can be achieved even at low let-down rates.” The new Lioplax line-up contains special- effect masterbatches in both liquid and solid forms that give adjustable frosted finish and a grainy textures to PET bottles. Riverdale Global has commissioned its first fully
www.compoundingworld.com
PHOTO: LANXESS
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