ADDITIVES | ANTIOXIDANTS
Figure 1: Ultranox LC shows less colour change (as measured by Yellowness Index) than a competitive stearate-free alternative after multiple passes. Test were carried out on an MFR4 polypropylene homopolymer compounded at 230°C in an inert atmosphere; multi-pass extrusions were run at 260°C in air. Source: SI Group
showing promise in polyethylene as well as polypropylene, and also in engineering polymers and elastomers. “We believe that this concept will reset the baseline performance demanded by polymer compounders and OEMs,” he says. SI Group also recently announced its phosphite
Right: Growing use of sulphur- based fumiga- tion techniques is placing an additional demand on polymer stabilisation
antioxidant Ultranox 626 has been granted an extension of existing approvals by the US Food & Drug Administration (FDA) for use as a food contact substance in polypropylene homopolymers and copolymers under Conditions of Use A through H as listed in FCN 1988 (the approval is specific to the material manufactured at SI Group’s Morgantown facility in the US). Ultranox 626 is a high-performance organophos- phite antioxidant designed for demanding applica- tions in propylene and ethylene homopolymers and copolymers, as well as for elastomers and engineer- ing compounds. It is particularly aimed at applica- tions where excellent colour stability is required. The recent extension permits the use of Ultranox 626 in a wide range of polypropylene food packag- ing and other food-contact applications. Dover Chemical Corporation continues to obtain food contact approvals for Doverphos LGP-11, its high molecular weight phosphite that is said to be suitable as an alternative to TNPP or any other phosphite additive for polyolefin applica- tions. It has already received broad FDA approvals for food contact applications in various thermo- plastics, while in the EU it now has approval for use in HIPS that comes into contact with food.
Protecting films Several companies have, in recent months, an- nounced new developments in additives designed
84 COMPOUNDING WORLD | September 2019
www.compoundingworld.com
to protect agricultural films against degradation. This issue has been aggravated in recent years by continuing growth in the use of sulphur as a fumigant. BASF says it is expanding its NOR technology to help farmers balance the need for greater yields of fruit and vegetables, while simultaneously meeting the ever-stringent environ- mental protection requirements of organic food production. NOR refers to the molecular structure of the additives: N for Nitrogen, O for Oxygen, and R for alkyl. In general, BASF says, NOR HALS has improved resistance to chemicals, notably acids. “Plasticulture – the use of plastic materials in agricultural applications – contributes significantly to producing more and better food all year,” the company says. Prominent examples include greenhouse covers to keep uniform temperature and humidity for continued food production; mulch films and irrigation pipes that reduce water consumption; and silage films that store livestock food in a cost-effective way. “The development of Tinuvin NOR 356 is the
result of BASF’s extensive competency in light and thermal stabilisation combined with our deep knowledge of agricultural market requirements,” says Volker Bach, Head of BASF’s Global Compe- tence Centre Plastics Additives. Tinuvin NOR 356 protects and extends the lifetime of agricultural films that are exposed to very high levels of UV radiation, heat and crop treatments such as elemental sulphur, and the compounds approved in certified organic farming to prevent plants diseases and fertilise the soil. Tinuvin NOR light stabilisers neutralise the
PHOTO: BASF/CLISOL
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