additives | Film applications
Figure 2: Effect of AS-301 antistat and established alternatives on PP properties Control 1017
Surface resistance (Ω) Flexural modulus (MPa) Heat distortion temp. (˚C)
Charpy impact strength (kJ/m2 Yellowness index Source: Adeka
Right:
Armostat 2000 CEP pellets
look like tiny pillow cases
, notched)
1700 100 1.3 5
AS-301 (10wt%) 2x1011 1650 95
2.1 9
Amide-base (15wt%) 1x1011 1600 94
2.7 9
Olefin-base (20wt%) 1x1011 1500 80
2.9 9
comparative products on the market. Its composition is said to be proprietary. According to Adeka, ADK Stab AS-301 offers the same antistatic performance as established market references (amide or olefin based) at lower addition rates and can provide higher performance when added at the same or higher concentration (Figure 1). The new additive comes in an easy-to-handle form and can, if desired, be added directly on the injection moulding or extrusion machine without pre-compounding. The company also says that the impact of ADK Stab AS-301 on the physical properties of polypropylene may be less pronounced than other state-of-the-art anti-static agents. In particular, it says the additive has less effect on properties such HDT (deflection tempera- ture under load) and flexural modulus (Figure 2). Transparency can also be maintained when used in film applications, even at a loading level as high as 15% where no blooming is observed. Although the data shown in Figures 1 and 2 is based on PP, the performance of ADK Stab AS-301 has also been proven for other polyolefins, including HDPE and PS, as well as engineering polymers such as PET and PBT. Adeka expects ADK Stab AS-301 will help to expand anti-dust applications for plastics not only in conventional fields but also in areas where controlling
charge build-up is crucial, such as packaging of electronic parts, packaging used in clean rooms and containers that require grounding. Another company with a new antistat development is PCC Chemax. Chemstat 273EP is a pastille version of the company’s vegetable-based ethoxylated stearyl amine Chemstat 273E. Chemax says it percieved a need in the market for an easy-to-handle version of this well-established chemistry, especially given the growth of film-based food packaging. “Processors typically choose an ethoxylated stearyl amine as an antistatic additive because it remains effective even when running at higher processing temperatures,” says Stephanie Angelo, PCC Chemax Director of Sales and Marketing. “The new pastille form can be fed directly into a twin-screw extruder. For those already using liquid injection, it is now much easier to melt smaller than full drum quantities, too.” Chemstat 273EP carries country-specific food-con-
tact approvals for PE and PP applications as well as for various styrenics used in injection moulding.
Figure 1: ADK Stab AS-301 antistatic performance compared to established market references (amide or olefin based) Source: Adeka
52 COMPOUNDING WORLD | January 2017
Bio-based options Some months ago, Palsgaard launched its Einar range of 100% vegetable-based polymer agents and additives. Prime among these are a number of products aimed at improving the antistatic and antifogging properties of PE films, which the company says were developed as a response to consumer concern over additives used in polymer products coming into direct contact with food. “Palsgaard applied its expertise from the food industry to
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PHOTO: AKZONOBEL
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