ADDITIVES | ANTIOXIDANTS AND STABILISERS


Right: Chitec’s Revonox 420V antioxidant has received US FDA food contact approval


pany says that the antioxidant has a cleaner toxicology profile than traditional phosphite stabilisers and has been designed with “future compliance” in mind, as regulatory bodies increase scrutiny of human health effects from additives and their degradation products. The additive is a high molecular weight polymeric phosphite and its high phosphorus content allows it to be used at lower loading levels, both of which contribute to low migration. The additive received US FDA clearance for food contact in LLDPE in 2019 and for HDPE in 2023. The company reports that it has recently submitted requests for food-contact approval from other major global regulatory bodies. Chitec announced that its Revonox 420V


antioxidant has received US FDA food contact substance notification (FCN) for use up to 0.1% (1,000 ppm) in HDPE, after previously receiving approval in PP. The phenol-free primary antioxidant is a hydroxylamine derived from renewable palm oil. It has good initial colour and is resistant to


gas-fading, the company reports. Chitec’s Revonox 501 is a patented, highly


efficient lactone-based chemistry that acts at low levels (50-100 ppm) as an acid scavenger or antioxidant booster. A new blend of Revonox 420V with Revonox 501 and Chitec’s nonmigrating phosphite is Revonox 601V. The blend is finding success in clear, thermoformed food packaging, where it prevents yellowing in material from in-house recycling. “We’ve found that the stabilised material can go through more than six passes through the extruder without yellowing, which allows thermoformers to more than double their regrind capabilities and reduce waste,” said James Gacek, Executive VP and Managing Director of North and Latin America for Chitec. The blend has FDA FCN approval in HDPE, and the company is


seeking to expand the approval to other polymers. Chitec received an FDA FCN in 2023 for its


novel UV blocker derived from vanillin and began introducing the Chiguard GA403 additive first in PET bottle applications. This year, the company rolled out the technology more broadly. In a presentation at the NPE exhibition in May, Gacek described the additive’s high absorption in the UV-A wavelength region, which makes it suitable for protecting UV-sensitive contents of clear PET containers or for optical applications (for example glasses, screens) requiring blue light absorbance. The additive has high heat stability and can be used in PET, PC, PA, PMMA, PP and PE. In addition to protecting from UV light wave- lengths for a given application, UV-blocking formulations seek a balance between initial colour, discoloration after UV aging, and photoperma- nence, said Gacek. Experiments with blends of different types of additives from Chitec found that blends of Chiguard GA403 with 380W (a phenyl benzoxazine UV blocker) and 5431 (a benzotriazole UV absorber) showed the best balance of these properties, along with blocking UV transmittance up to 400 nm. UK-based Radical Materials has developed a


At a loading of 1,500 ppm in a 1 mm thick PET film, Chitec’s GA403 UV-blocking additive can block blue light up to 405 nm Source: Chitec


30 COMPOUNDING WORLD | September 2024


UV-stabilised and impact modifying masterbatch package specifically for antimicrobial polyketone compounds that contain a silver ion technology. The company, which makes compounds for demanding applications including food processing equipment, said the development challenge was to provide a package that mitigates the negative effects of UVB radiation on the colour stability of the polymer, provides cold temperature impact performance and also continues to deliver long term antimicrobial efficacy using additive packages that are approved by both the FDA and EFSA for food contact applications. In its development work, Radical Materials


produced antimicrobial polyketone test specimens www.compoundingworld.com


IMAGE: REVONOX


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