Entira EP Compatibilizer
Recycling of Mixed Streams of Plastics
Up until now, recycling of waste streams based on mixed plastics has often proved to be unfeasible from a performance and overall cost-benefit perspective. DuPont brings a new solution to this important challenge, with its new series of Entira EP copolymers. These high performance compatibilizers, based on ethylene copolymers, are able to boost the performance of recycled polyolefins to a similar level as virgin resins.
Mixed streams containing polypropylene (PP) and polyethylene (PE) are often difficult to separate due to the similarities in densities. If a waste stream of one of these two polymers is contaminated by the other one, the resulting mechanical properties are often very low. This can make it difficult or impossible to process such feedstock using standard polymer extrusion or injection technologies. Adding Entira EP compatibilizer (typically 3-7 wt. %) bridges the PE contaminant to the PP matrix (or vice-versa) and creates a homogeneous recycled resin. It leads to increased performance and surface properties for items manufactured with such ‘upgraded’ recycled resin. In addition to its use for production of bulky items (flower pots, outdoor furniture), such recycled resins will be suitable for use in higher value applications, as in thin films and membranes for the construction industry.
Beside recycling of polypropylene-polyethylene blends, Entira™ EP is already being used for compatibilization of polypropylene (PP) with polyvinylbutyral (PVB) in commercial applications. For example, Hainaut-Plast, a French leader in recycling of PVB, is using it in diverse end-use applications such as sound deadening parts for automotive. The unique process used to recover PVB from waste glass shields, combined with the addition of Entira EP, makes for a more economical and efficient recycling process. “Incompatible plastics mixtures are very common in waste streams. As a consequence, it is expensive and often non profitable for recyclers to collect, clean, sort, grind and melt process the streams. Our Entira EP technology can help solve this challenge, enabling recyclers to use less expensive plastic waste feedstock while producing recycled pellets with good properties, and to reach profitability in return,” said Loic Rolland (R&D Fellow) and Lucie Charbonnel (Marketing Specialist), DuPont Performance Materials.
DuPont International Sàrl
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