ADDITIVES | IMPACT MODIFIERS
tive industry need to act fast, seize new technolo- gies, and collaborate with the right partners,” said Andrea Benvenuti, Global MobilityScience Sustain- ability Application Team Leader. “We in the MobilityScience team are committed to supporting OEMs and Tiers in their sustainability and design aspirations with our technology and expertise, and to helping build the ecosystem needed to bring about circularity and decarbonisation.”
Enhancement of impact strength and elongation at break in recycled PP using TEGO XP 21002 Source: Evonik
compatibility to the targeted polymer so migration is avoided and important properties guaranteed. Recycled HDPE, which is added to virgin HDPE in industrial applications like containers, intermedi- ate bulk containers, pipes, and boxes, often faces issues with impact strength. Adding 1% TEGO XP 21002 to HDPE containing 50 % rHDPE improves impact strength at minus 30°C by up to 200% and increases the MFI from 6.5 to 15, says Evonik. The OMS impact-modification makes rHDPE suitable to be mixed in higher concentration to a virgin polymer or to be used as 100% recycled material in products that require this. PP is one of the most important polymers used in automotive, packaging, and textiles. Here, TEGO XP 21002 can improve the impact strength of rPP by about 30%. “Next generation impact strength enhancers are still in experimental stage, but our results have been proven by first customers with a positive feedback,” the company said. “The experimental grade is liquid, but using the Evonik Accurel technology allows us to offer high loaded concentrates based on different polymers.” At the VDI Plastics in Automotive Engineering event in Mannheim, Germany, last June,Dow showcased several new materials targeting a low-carbon future for mobility across the entire vehicle life cycle. This requirement has been exacerbated by EU regulations slated for introduc- tion by 2030 requiring that 25% of the plastic used to build new vehicles come from recycling, of which 25% must be from end-of-life vehicles. Top of the list of sustainability-enabling materials was the company’s Engage 11000 polyolefin elastomer series of impact modifiers for thermoplastic olefin applications such as bumpers and door panels, which help address the loss in properties from partial use of rPP in automotive compounds. “With all today’s challenges, we in the automo-
50 COMPOUNDING WORLD | April 2025
Polycarbonate boost Dow has also reported advancements in the application of its Paraloid EXL impact modifiers in post-consumer PC demonstrating that incorporat- ing a slightly increased dosage significantly enhances the impact strength of PC containing up to 75% recycled content. This improvement is particularly evident after hydrolytic ageing at 90° C and 95% humidity for 14 days, under which conditions the impact strength nearly doubled compared to the standard formulation at room temperature. In addition, the test specimens’ failure mode shifted from complete break to hinge break, indicating improved material toughness. The stability of Paraloid EXL-2691J has been observed across various sources of post-consumer PC, demonstrating remarkably consistent impact strength. This was evident in three batches of recycled PC tested by the company which had been sourced from different origins, including automotive headlight bases, electrical device housings, and greenhouse sheets. In contrast, Dow said other modifiers showed more variation in impact strength. These particular impact modifiers, composed of methyl methacrylate-butadiene- styrene (MBS) with a core-shell structure, have been designed to not only enhance impact strength but also maintain the strength and modulus of the material and preserve mechanical properties during heat ageing. The modifiers are also effective in reducing the thickness sensitivity of PC and ensuring excellent processing stability. Dow says over the past decade it has reused hundreds of thousands of metric tonnes of post-consumer PC, and will continue to develop new solutions to support the recycling industry.
CLICK ON THE LINKS FOR MORE INFORMATION: �
https://kraton.com �
www.impact-modifiers.com (Jindaquan) �
www.sacoaei.com �
www.tisan.com.tr �
https://sk-fp.com �
www.evonik.com �
www.dow.com
www.compoundingworld.com
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