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ADDITIVES | ANTIOXIDANTS/UV STABILISERS Songwon puts forward a number of alternative


approaches for the stabilisation of LLDPE. Its experts – based in South Korea, Switzerland, and the US – say that traditional general purpose stabilisation of LLDPE film using hindered phenols and monophos- phites or TNPP is increasingly unsuitable. They say this is due to tougher standards with regard to molecular weight protection and discoloration during melt conversion, as well as more stringent regulatory requirements. Manufacturers looking to replace TNPP in LLDPE film have two options, the experts say. “They can either select an alternative liquid phosphite or go for a solid one such as Songnox 1680 antioxidant, which is suitable for general purpose blown film and the best choice in terms of cost versus performance.” For more demanding applications though,


including production of pipes and cast film, roto- moulding, processes using mPE (with its narrow molecular weight distribution), and processes involving high temperatures and shear processing, the required loading level of Songnox 1680 would exceed the solubility level and cause blooming. “One option is to replace Songnox 1680 with


Songnox PQ, a higher performance processing stabiliser, because it has better compatibility and solubility in LLDPE. The other option is to keep the amount of Songnox 1680 below its maximum solubility level in polyethylene and add a high-end radical scavenger.”


Formulation: TPV (100) / AO-60 (0.05) / 2112 (0.05) / UVA (0.15) / HALS* (0.15) *Active component Processing: Roll: 180 ºC, Press: 180 ºC, Thickness: 0.4mm Acceleration test: 700 ppm NOx gas at room temperature for 24hr


Figure 1: NOx gas discolouration resistance of Adeka’s ADK Stab LA-704 against market references (natural TPV, 0.4mm) Source: Adeka


Automotive performers Numerous new stabiliser developments have been created with automotive interior and exterior applications in mind. One example is ADK Stab LA-704, a new N-alkyl type HALS from Adeka, which is said to be particularly suitable for interior applications based on thermoplastic elastomers such as TPVs. Adeka says the new additive shows “excellent performance with respect to NOx discoloration and fogging resistance, which are both considered essential for these applications.” It is available in powder form on a silica carrier or as a PP masterbatch. In an unpigmented TPV formulation, ADK Stab LA-704 is reported to show best-in-class NOx gas discoloration resistance compared to market references including NO-Alkyl or N-Alkyl type HALS (Figure 1). The company says tests show it also provides excellent fogging behaviour in TPV formulations submitted to a DIN 75201 testing procedure (Figure 2). This is attributed to its high compatibility with TPV polymers. In March this year, Clariant revealed a new heat and light shield to address the increasingly tough OEM requirements in automotive interiors. “Ad- dWorks ATR 146 is now setting a new benchmark, aiming to create longer-lasting aesthetics and a healthier environment inside future vehicles due to reduced Volatile Organic Compounds (VOC),” the company claims. ATR 146, which is not yet com- mercially available, is described as a low dosage, sulphur-free stabiliser for filled PP compounds used in interior applications (Compounding World August 2017, page 34). Songwon’s technical team also proposes some


Formulation: TPV (100) / AO-60 (0.05) / 2112 (0.05) / UVA (0.15) / HALS* (0.15) *Active component Processing: Extrusion: 200 ºC


Figure 2: DIN 75201 fogging test performance of Adeka’s ADK Stab LA-704 against market references (haze increase of cover glass) Source: Adeka


42 COMPOUNDING WORLD | September 2017


strategies for improving long term thermal stability (LTTS) in PP. They say that Songxtend 2124, which was launched in 2016, near triples the LTTS effect of Songnox 1010 (originally Irganox 1010). The company claims it yields the best LTTS effect available today but that both products present


www.compoundingworld.com


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