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ADDITIVES | COMPATIBILISERS


Figure 1: Photos show the whiteness of Polymer Asia’s PA Bond grades in comparison with competitors. The left image shows PA Bond 363C with a Yellowness Index (YI) of 3.5 (left sample) against an alternative with a YI of 10.46. The right image shows PA Bond 700 with a YI of 13.53 (left sample) against a competitive product with YI of 21.97


Tisan Engineering Plastics is another relative newcomer to the maleic anhydride grafted polymer sector, launching its Olebond line of grafted PP, PE, EVA and ABS compounds last year. All are produced at its production plant in Istanbul in Turkey using reactive extrusion techniques and carry global approvals. The company says its aim in the development of the Olebond product line was to engineer a range of compounds that improved both product performance and production efficiency. Applica- tions include use as a compatibiliser, coupling agent, impact modifier and adhesive agent in markets such as compounding, composite and multilayer barrier pipe, halogen-free flame retard- ant cables, metal coating, co-extrusion, cast and blown films,and recycling. The product line includes a number of grades suitable for impact modification of PA 6 and 66, including Olebond 7403 IM-C, 7403 IM-R, 7403 IM-Z. All three grades are based on high maleic anhydride grafted PE and, in addition to impact improvement, reduce moisture absorption to enhance dimensional stability. Probably best known for its Xiran styrene maleic anhydride (SMA) and N-phenylmaleimide (SMANP- MI) injection moulding co- and terpolymers (pro- duced in a plant originally built by DSM), Polyscope


has also been growing its businesss in what it calls “blend optimisers” under the Xibond banner, using similar chemistry. These products encompass compatibilisers, coupling agents, chain extenders, viscosity modifiers, and surface modifiers. Xibond functional styrenics are especially suitable for polymer blends containing styrenics- based polymers such as ABS, HIPS and ASA, says Ardy Doelen, Sales and Business Development Manager at the company. He adds that in filled compounds, the functional groups in Xibond additives can also interact with reactive groups – such as OH and NH2


– present in the filler.


Selection support He says that one of the key findings of a marketing study it carried out was that product developers were looking to have quick access to support, hence the development of a new web-based selection tool. “The Xibond selector enables developers to quickly find the best Xibond solution to their challenges. Initially we found the most solutions in styrenics such as ABS and HIPS, but recently more solutions in polyamides and polyes- ters were released, he says. Doelen adds that blends of polyamides and


Figure 2: Microscopic images showing the morphology of a PA6/ABS blend before and after the addition of Xibond 315


18 COMPOUNDING WORLD | May 2019


styrenics are becoming more interesting for various industries, including electronics, automotive and medical appliances. “The combination of PA6 and ABS is the most common blend, but without a compatibiliser these polymers cannot be blended and will result in delamination,” he says. Polyscope has developed a specific grade for polyamides and styrenics – Xibond 315. This grade features a moderate maleic anhydride content to ensure a reaction with the end groups of the polyamide and is also compatible with ABS. An addition of 2-3% of Xibond 315 is sufficient to lead to an optimised morphology [see Figure 2 and Table 1]. “It has proven to work very well with various combinations of PA6 and ABS,” Doelen says.


www.compoundingworld.com


PHOTO: POLYSCOPE


PHOTO: POLYMER ASIA


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