additives feature | Antioxidants
antioxidants, moving away from propionates and phosphites and focusing on its acrylate-based MileOx 549 and MileOx 3052. These are used to maintain existing functionality when incorporated into elasto- meric materials such as SBR, SBS and SIS. General manager Robert Kuc says both products possess unique secondary characteristics in addition to the basic functionality.
Source: Cytec
MileOx 549 is effective in stabilising polyolefi ns at high processing temperatures. MileOx 3052 possesses a carbon radical stabilisation function to prevent the crosslinking reaction from causing undesired polymer gelation. MPI now also offers MileOx 661, which Kuc describes as a high-performance, hybrid processing stabiliser. It also acts to inhibit generation of fi sh eyes during fi lm-coating with LLDPE.
PolyAd Services, which provides custom formulations and incorporation technologies for antioxidants and UV-stabiliser blends for numerous applications, is continuing to expand into new markets. Part of BASF until late last year but now owned by Edgewater Capital Partners, it supplies additives and formulation services from locations in the US and Germany.
Source: Cytec Automotive OEMs are demanding that thermoplastic
polyolefi ns (TPOs) for automotive interiors exhibit high stability under extreme UV and thermal conditions to ensure a long service life in any condition, says Cytec. It says its Cyasorb Cynergy Solutions V703 stabiliser “meets the most demanding automotive specifi cations and it is now the state-of-the-art for this application.” Global marketing manager Andrea Landuzzi says the
stabiliser delivers “exceptional” UV durability in interior and also exterior applications, even with extended UV exposure, and affords superior maintenance of colour, gloss and physical properties. It is non-blooming, paintable and meets in-cabin requirements for low VOC/ fogging. Cyasorb Cynergy Solutions V708T stabiliser is the
latest addition to the company’s automotive plastics product portfolio. Landuzzi says it provides optimal performance under severe UV and thermal conditions, while overcoming issues with odour, VOCs and blooming. MPI Chemie continues to promote its select range of
44 COMPOUNDING WORLD | September 2015
Historically, the company has concentrated on high temperature stabilisation systems for polyamides (its 201 Iodide Stabiliser package based on copper iodide and potassium iodide for under-bonnet applications has been on the market for around 20 years), but more recently it has been branching out into systems for polyolefi ns. PolyAd Services R&D director Steve Magaha says performance improvement targets are similar, but the additives packages are completely different. “This is one of our advantages, that we can develop systems across polymer families,” he says.
Magaha cites the recent example of a customer that
was looking to improve the high temperature performance of a polypropylene primarily for use in automotive under-the-bonnet applications. The new proprietary system the company formulated for the application - a mix of several antioxidants and synergists - enabled the PP to retain its initial tensile strength after 1000 hours at 150°C. “The polymer without any stabilisers would not last even 250 hours,” Magaha says. “A normal stabiliser package based on a phenolic antioxidant may last 250 hours, but certainly not 500. We think this is a very good development.” Magaha is cautious on how much more improvement
can be realised. “There is not much potential left to increase the temperatures PP can resist before you run into issues with HDT [defl ection temperature under load but there is the potential to resist the same high temperature for longer,” he says. PolyAd Services also offers stabiliser packages for
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