ADDITIVES | IMPACT MODIFIERS
Above: Dow’s Engage 11000 series modifiers can improve impact performance of TPO bumper compounds
possible to optimise the compromise between chain breakage and grafting efficiency. Olebond 7403 IM-C is an MAH-grafted polyeth-
ylene that is developed for use as an impact modifier for PA. It is said to enhance low-tempera- ture impact properties through adhesion to the PA through the reaction of amine or carboxylic acid end-groups of the PA polymer with the functional group of the Olebond. Olebond 7403 IM-C has a Tg below -50°C, which the company says means it provides “out- standing” performance at low temperatures. Tisan does not provide a figure for the level of grafting but says that its high functionality means that only a small amount of Olebond 7403 IM-C is required to see a positive effect. To reach high levels of impact resistance in PA compounds, the company says addition levels of up to 20% may be required. In the automotive sector, Dow says it has been
expanding technology options for its Engage impact modifiers. The company says that reducing greenhouse gas emissions is a critical concern in the automotive industry and that lightweighting through replacement of metal parts with polymeric alternatives such as modified polypropylenes (TPOs) is one of the key approaches to emission
reduction. It cites the Engage 11000 range of polyolefin elastomers (POEs) as one example — these can be used not only for impact modification of PP compounds used for body panels (and other parts) but also to reduce coefficient of linear thermal expansion (CLTE) closer to levels of the metal parts that the panels fit next to. “Engage 11000 allows TPO compounders, part manufacturers and OEMs to develop solutions with reduced part weight and improved system costs through processing advantages,” says Zshelyz Lee, Senior Marketing Manager at Dow. “It also enables more complex designs and thinner parts with a higher balance of flow, stiffness and toughness. Such POEs are suitable for TPO compounds for a range of applications: instrument and door panels, air bag covers and bumper fascia, rocker panels and tail gates.” Lee says that, with its Engage 11000 POEs, Dow
has “expanded the design space for OEMs while improving performance for end consumers.” Some months ago, Swiss masterbatch specialist
Sukano launched a newly formulated transparent impact modifier for cold, flash frozen and room temperature applications under the umbrella of the Sukano RPET Product Portfolio. It says the Sukano Impact Modifier Masterbatch can enable virgin or recycled PET to replace specialised co-polyester resins, so allowing the end application to be mono-material and recyclable. “Customers have a recyclable alternative at hand
to replace products made of, for instance, copoly- ester or GAG film structures, while enjoying the benefits that go beyond mechanical properties modification,” says Alessandra Funcia, Head of Mar- keting at Sukano. Improved durability and toughness are said to be achieved without a loss in transparency. “It also allows safe packaging for consumers by reducing sharp edges and it leads to less shards, avoiding contamination,” says Funcia. “Our customers can
IMAGE: SHUTTERSTOCK
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