MATERIALS | COMPATIBILISERS
instructions to the public in North America. According to Ampacet, ReVive maintains good
flow properties with typical let-down ratios of 1.5-4.5% of the total film structure in recycled materials containing polyamide and/or EVOH barrier layers, leading to improved processing. “When Ampacet ReVive is added at just 15% of the PA 6 content into a PE/PA 6 recycle stream with up to 30% polyamide, it improves physical properties and processability, reduces gels and improves MFR,” says the company. Similar results were observed with EVOH/PE and PA 6/EVOH/PE streams. CirKular+ additives from Kraton (best known for various types of SBS and SEBS elastomers) were launched last year “to support industry’s commit- ment to sustainability and circularity through the reuse, reduce and recycle initiatives” (see Plastics Recycling World May-June 2020). The CirKular+ product line includes a Compatibilisation Series and a Performance Enhancement Series. Kraton says CirKular+ compatibilisers enable upcycling of plastics and circular economy solutions “via versatile multi-resin compatibilisation and performance enhancement of PCR and PIR waste streams in a wide range of applications. At low
dosage, CirKular+ additives help maximize the recycled content and enhance the PCR perfor- mance without compromising product performance and brand identity, while allowing to broaden the range of the potential end-use applications.” The CirKular+ Compatibilisation Series can be used for various normally incompatible mixes, such as PP/polyamides, polyolefins/PET, polyamides/ PET, and others. Kraton says that as little as 3-5% of CirKular+ additives results in up to 500% improved mechanical performance of PCR and PIR in compositions containing more than 70% recycled resin, and improved durability with minimal loss in stiffness. It also says that recycled plastics modified with the additives deliver superior performance even after the recycled material is reprocessed up to five times. Polymer Asia Technology has developed two new coupling agents to support the recycling of PET. They are said to enable rPET to be used in applications in areas such as consumer electronics and appliances where, for example, virgin PBT might be used. These grades, PA-Bond 821 and PA-bond 948G within the company’s well-estab- lished PA-Bond series, use a new mechanism which it calls “Dual-Active.”
“It´s the well-known maleic anhydride-based mechanism plus something else,” says Matthias Stücke, Deputy General Manager at Mitsui & Co Deutschland. Mitsui, the global partner for Polymer Asia, is now introducing these materials to the market. The materials are based on a polyolefin elastomer, POE. Each has one active component, so both grades are needed in any one compound, acting rather like a two-component adhesive. “The reason why the active components are
Effect of addition of SEBS to a mix of polar PS and non-polar HDPE Source: Kraton
Effect on various properties of a PCR HDPE/PET blend (80/20) of addition of 5% CirKular C1010. Similar effects are seen in LDPE/PET streams
separated is that you can control the dosage better according to the condition of your recycled material,” says Stücke. PA-Bond 948G contains
Source: Kraton 44 PLASTICS RECYCLING WORLD | May/June 2021
www.plasticsrecyclingworld.com
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