ADDITIVES | IMPACT MODIFIERS
Figure 1 Star chart showing the effect of three different Dow Fusabond N impact modifiers on properties of PA6. Fusabond N495 shows the best impact performance at high and low temperatures
Source: Dow
Figure 2 Star chart showing the effect of three different Fusabond N impact modifiers on performance of PA66. Note that Fusabond N495 gives considerably improved flow Source: Dow
Below: Orevac IM800 from SK Functional Polymers is recommended for automotive applications
glass-filled polyamide compounds,” she says. Surlyn ionomer grades provide good impact resistance and high gloss to polyamide and specific grades are FDA-approved for direct food contact. Small particle size and uniform particle size distribution can be achieved with Fusabond N types, while the higher polarity of Fusabond A and Surlyn grades allows for even finer modifier particle dispersion. Fusabond N493, which is based on a polyolefin elastomer (POE), is well established as a PA6 and PA66 impact modifier and is suitable for a broad range of final applications. Figures 1 and 2 show the performance levels achieved at loadings between 5 and 20% in PA6 and PA66 and provide an overall performance comparison of Fusabond N493 with two other recent additions to the Fusabond family, N216 and N495 (also POE-based). Tests conducted within Dow’s R&D facility show that Fusabond N495 can be used to achieve higher
performance, in terms of stiffness/toughness and flow, compared to Fusabond N493. Fusabond N216 (another new POE-based Fusabond grade) and Fusabond N215 are said to be alternatives suitable for meet medium impact requirements. Dow says Fusabond A560 is aimed at glass fibre
reinforced PA6 compounds. It is said to be particu- larly effective at low addition levels and offers the added advantage that flexural modulus and temperature resistance are only slightly reduced. Other Fusabond N grades used at the same concentration have a higher effect on these two properties, the company says. Compounds toughened with Fusabond A560 also show better flow and a lower viscosity than alternative compounds toughened with the same amount (10%) of MAH-grafted high performance tougheners, according to Dow. The improved flow is said to result in improved mould filling and also better surface appearance of moulded parts. Aside from the Fusabond, Surlyn, Elvaloy and
Elvaloy AC products, Dow also offers its Engage polyolefin elastomers and Infuse olefin block copolymers as impact modifiers for thermoplastic olefin (TPO) compounds.
Grafted additives The Orevac and Lotader impact modifying resins, which were previously produced by Arkema, are now within the portfolio of Korean company SK Functional Polymers. Orevac IM resins feature grafted anhydride groups that make them reactive. The products combine good processability with the required reactivity required for polyamides, according to the company.
24 COMPOUNDING WORLD | April 2021
www.compoundingworld.com
IMAGE: SK FUNCTIONAL POLYMERS
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