ADDITIVES | ANTIOXIDANTS/UV STABILISERS
Figure 3: Change in ∆E value for PP containing BASF’s Tinuvin 880 HALS compared with two competitive alternatives after weathering (dry Xenon PV 1303) Source BASF
some organoleptic issues. However, a new system is claimed to approximately triple the performance of the industry standard (Songnox 1010 + Songnox DSTDP (25:75)) at low temperature testing (80°C) while offering greatly improved organoleptic properties and low VOCs. The performance of the new system is currently being further evaluated.
Interior moves BASF introduced a new generation of low molecu- lar weight methylated HALS at K2016, which it says enables formulators producing compounds based on PP – including TPO elastomer-modified types – “to optimise the long-lasting appearance and performance of various automotive interior parts.” The company says Tinuvin 880 provides “un- matched” intrinsic long-lasting UV resistance (Figure 3) as well as much improved thermal stability for interior applications. As a consequence, it expects Tinuvin 880 to be a leading candidate to improve stabilisation of exterior parts such as bumper, side cladding and rocker panels as well. The company also points out that, as Tinuvin 880 is a 100% active substance, formulators have more freedom to accurately adjust part performance properties as well as critical compound economics. Speaking at the introduction of Tinuvin 880,
Volker Bach from BASF’s plastics additives global competence centre in Switzerland, emphasised that, in addition to its core stabilising properties, Tinuvin 880 improved secondary properties by eliminating defects such as mould deposit and
44 COMPOUNDING WORLD | September 2017
Tinuvin 880 from BASF is supplied aas a 100% active substance, giving formulators greater flexibility
surface stickiness even in scratch-improved materials. “We have to achieve excellent light stability, but that is a given,” he said. “What has been important in the past – gloss, appearance, high light stability – on their own is not enough a guarantee to satisfy OEM customer expectations.” Meanwhile, a “revolutionary next generation of
UV stabilisation technology” is said to be close to commercialisation by Solvay (which acquired the Cytec composites and polymer additives business in 2015). Its Cyasorb Cyxtra V9900 stabiliser will be introduced next month and is said to exhibit not only high UV stabilising performance but also to provide cost benefits. “It meets all worldwide automotive UV weathering specifications and surpasses key automo- tive requirements such as low VOC emission, low fogging, low odour and no interference with paint adhesion,” says Global Marketing Director Andrea Landuzzi. It is also non-dusting.
Targeting ETPs OKA-Tec in Germany specialises in novel long-term stabilisers based on polymeric amines and other special AOs. The Okaflex range includes polymeric stabilisers for long-term stabilisation up to 200°C that also improve resistance to media such as hot-oils, glycols, urea, cooling agents, greases, electrolytes and detergents. Due to the good thermal stabilisation performance, low volatility and high purity, the company says Okaflex grades are good alternatives to copper based stabilisers for polyamides. They are already approved for demand-
www.compoundingworld.com
PHOTO: BASF
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