ADDITIVES | IMPACT MODIFIERS
opportunity to use the mass balance approach and adopt ISCC PLUS certification to produce renew- able products. The SBC polymers are produced using certified
renewable butadiene and Kraton says output of this is expected to increase gradually to meet growing market demand over the coming years. ISCC certified butadiene is currently available
from several suppliers. In mid-March, SABIC said it was collaborating with Kraton to deliver certified renewable butadiene from its Trucircle portfolio. SABIC says the product is derived from ‘second generation’ renewable feedstock such as tall oil, a by-product from the wood pulping process in the paper industry. The company says each kilogram of this butadiene reduces CO2
Above: Kraton is working with SABIC to source renewable butadiene for SBC production produced from wood pulp by-products
also testify that these high-performance master- batches provide additional functionality as a cutting aid, improving die cutting in production, speeding up the lines and avoiding any cross-con- tamination potential by splinters.” Bio-based specialty producer Kraton Corpora-
tion, which produces a range of polymers and high-value bio-based products derived from pine wood pulping co-products (and was recently acquired by the Korean company DL Chemical), announced last December that it had received the International Sustainability and Carbon Certifica- tion (ISCC) Plus covering production of styrenic block copolymers (SBCs) from renewables at its Berre, France facility. ISCC Plus certification supports traceability of
recycled and renewable-based materials across the supply chain and verifies that companies meet social and environmental standards. Traceability is a key element in the mass balance accreditation of production systems. In this approach, both renew- able and fossil feedstocks are combined in the production process and products are attributed a certain amount of renewable content, which can be tracked in the value chain. SBCs are used to modify impact performance in
numerous polymers, including styrenics, PP and engineering thermoplastics. Kraton says its SBC polymers are stronger than some other olefinic elastomers due to their phase separation morphol- ogy. The company says this makes them effective at lower addition rates – typically 3-10%. The renewable-based SBC polymers have been launched as the CirKular+ ReNew Series, which is an extension of Kraton’s existing CirKular+ product line of upcycling and circular economy solutions. The company says that, with up to 70% renewable content, the ReNew Series offers customers the
48 COMPOUNDING WORLD | April 2022
of 4kg compared to fossil-based virgin alternatives. According to a Kraton representative, the
CirKular+ ReNew Series “expands Kraton’s existing suite of solutions designed to advance the circular economy…The unlocked sustainability benefits with CirKular+ ReNew Series can help compound- ers support the sustainability objectives set by brand owners and automotive OEMs.” In February, Kraton also announced that its
CirKular+ Performance Enhancement Series C2000 and C3000 have been approved as fully compat- ible with recycling of PP containers in Europe according to RecyClass. This is a comprehensive cross-industry initiative that works to advance plastic packaging recyclability and to establish a harmonised approach to recycled content calcula- tion and traceability in Europe. Pellets containing 5 wt% of either CirKular+ C2000 or C3000 resin blended in an injection moulding PP grade matrix were tested according to the Association of Plastic Recyclers (APR) Critical Guidance for PP Rigid Containers. According to Fabrizio di Gregorio, Technical Director of Plastics Recyclers Europe (RecyClass), when used at up to 5% of total packaging weight, the CirKular+ C2000 and C3000 resins are fully compatible with the existing European industrial recycling processes for PP containers. The resins also improve the recyclate impact strength by up to 500%.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.milliken.com �
www.thecompoundcompany.com �
www.sacoaei.com �
www.tisan.com.tr �
www.dow.com �
www.sukano.com �
https://kraton.com/ �
www.sabic.com
www.compoundingworld.com
emissions by an average
IMAGE: SABIC
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