ADDITIVES | RECYCLING
deliver improved long-term weatherability in the finished part. The additive has US FDA food-contact clear- ances for use in HDPE, PP and PET. Compatibilisers and coupling agents provide significant benefits for formulations with recycled content, because they act to bring together dissimi- lar materials. In mechanical recycling, a stream of one polymer may have a small amount of a different polymer remaining in it. This “contaminant” can degrade properties. A compatibiliser counteracts this effect by acting at the interface of the different materials to improve strength properties. As discussed in Compounding World’s May
Revonox 501, a multifunctional processing stabiliser based on a redesigned benzofuranone molecular architecture, exhibits higher thermal stability than conventional benzofuranone technology. TGA results show virtually no weight loss below 300 C Source: Chitec Technology
2026 issue, a growing area for compatibilisers is in rHIPS, rABS, rPC, and rPC/ABS blends, to improve properties of materials collected under the EU’s waste electrical and electronic equipment (EEE) and end-of-life vehicles directives. For example, Elvaloy AC 1330 from Dow is a copolymer of ethylene and methyl acrylate that can be used as an additive in virgin and recycled ABS to improve processability, impact performance and optical properties, particularly in rABS, the company said. The additive recently received RecyClass automotive and EEE technology approval after it was evaluated under RecyClass protocols and found to be compatible with recycling processes.
SKFP additives can be used to adjust the viscosity of recycled PC/ABS, including blends that contain PP. Lotader AX8750T increases viscosity (lowers MFI) and Lotryl 28BA700T lowers viscosity (raises MFI) Source: SK Functional Polymers.
accelerate degradation. “Compared with earlier benzofuranone tech- nologies, Revonox 501 exhibits significantly higher thermal stability, making it particularly well suited for today’s higher-temperature extrusion, com- pounding, and engineering plastic applications,” he added. The additive prevents polymer degrada- tion, helps preserve polymer molecular weight and helps maintain consistent processing performance. Revonox 501 has also been found to improve
the efficiency of conventional antioxidant pack- ages. It can be used to replace a small portion of traditional primary and secondary antioxidants, which improves melt flow stability and reduces overall additive demand, Gacek said. In addition, because less oxidative degradation occurs during processing, the additive also helps preserve the effectiveness of HALS, allowing light stabilisers to
48 COMPOUNDING WORLD | October 2026
Engineering compounds The latest from SK Functional Polymers is Lotader AX8900T, a reactive ethylene terpolymer that can be used in virgin or recycled engineering plastics compounds. Lotader AX8900T has a higher melting point than the similar Lotader AX8900, and either additive can be used as a compatibiliser, impact modifier, viscosity enhancer, or for hydroly- sis protection. The two additives are produced in two different production sites to ensure strong supply robustness, noted Nico Esselin, Mechanical Recycling Market Development manager at SK Functional Polymers. Other additives from the company for recycled polymers include Lotader AX8750T, Lotryl 29MA03T and Lotryl 40MA05T. The additives act to compatibi- lise different components in recycled styrenic blends, such as rPC/ABS, even in the presence of 2% PP contamination, as indicated by an improvement in elongation at break (see chart). The two Lotryl additives significantly improve impact resistance, particularly at room temperature, said Esselin. Lotader AX8900 benefits impact at room tempera- ture and also at low temperatures, down to -30°C. The additives are being increasingly used as viscosity modifiers in rPC/ABS, said Esselin. Lotader
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