RECYCLING | ADDITIVES
streams can be inhomogeneous and fluctuating, lowering the quality of recycled plastic grades. Incompatibility of polymers in recyclate mixtures may have a direct impact on melt flow index (MFI), the creation of black spots, gels or die build-up and delamination. It says its first generation of compatibilisers, such as Cesa Mix Additives, show good results in minimising the impact of oxidative residues and keeping melt flow index (MFI) in the right process range.
Mineral approach Minerals supplier Imerys has another way of compatibilising PE and PP. Marketing Manager Cyril Coppel says the company’s ImerLink solution is an engineered mineral designed specifically to compatibilise recycled blends of the two polyole- fins. “Imerlink enables true compatibilisation by creating a chemical bond with PE and PP. It results in improved mechanical properties with an opti- mum stiffness/toughness and is also cost effective,” he says. “In addition to improved mechanical properties, Imerlink provides thermal stability and improved aesthetics. Focusing on two applications, one in injection moulding and the other in extru-
Figure 4: Effect of Nexamite R201 on MFR in recycled PP compounded for 90s at 230°C Source: Nexam Chemical
sion, will better show benefits of this technology.” The CirKular+ additives from Kraton (best known for its various types of SBS and SEBS elastomers) were launched last year. The product line includes a Compatibilisation Series and a Performance Enhancement Series and the com- pany says that even at low dosages, CirKular+ additives can help raise recycled content and enhance PCR performance without compromising product performance.
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