MATERIALS | ADDITIVES
dimensional control and crystallisation stability during the post-injection moulding period.” Milliken also has future developments in mind.
“We are exploring opportunities across various areas such as melt-flow optimisation, impact enhancement, and food-contact approved prod- ucts,” says Randall. “Additionally, we are interested in addressing VOC and organoleptic concerns to further facilitate the adoption of products in this space. Apart from creating new additives, we are also considering the adjacent markets that cur- rently do not have sufficient representation from PCR materials. We believe that developing these markets and making PCR materials readily available for all appropriate applications is an area with great potential for growth.” Impact modification is an important topic for
recycled plastics, according to SK Functional Polymer. The company adds that achieving the same level of mechanical properties with recycled materials as traditional virgin plastics is a key goal for the future. “One of the biggest current industry trends is mechanical recycling to reduce waste and lower the carbon footprint of plastics,” says Nicolas Esselin, Market Development Manager, Com-
pounds. “SK Functional Polymer anticipates growing demand in this area and has solutions to improve the mechanical properties of plastics coming from mechanical recycling.” Esselin adds that a major problem in using these
materials is the need to compensate for the loss of properties of virgin resins and compatibilise the plastic blends. New sustainable solutions in impact modification can also assist in compatibilisation. Other technical issues include developing solutions to adjust the rheology of recycled plastics for efficient processing. Indeed, injection moulding and extrusion require quite different rheology. From the same recycled blends, SK Functional Polymer offers solutions to increase or lower the viscosity, according to processing technology requirements. A further issue is to improve mechanical properties, such as tensile strength, impact strength and elongation at break. In lightweight solutions, the use of glass fibres is particularly important, but so is a good coupling agent to provide the right properties. The company says that it has a large range of coupling agents for compounds filled with mineral, inorganic and organic materials. In applications where the recycled feedstock is contaminated, a compatibiliser is
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