ADDITIVES | ELECTRICALLY CONDUCTIVE
Right: Adeka’s ADK Stab AS-301E is supplied in an easy-to-handle pellet form
“Ionphase trSTAT has been specifically designed to meet the market’s needs for an anti-static agent which can be used in transparent, PMMA end applications such as ESD protection for covers and housings in electronics, dust prevention for automotive interior parts and dust prevention in consumer appliances,” says Croda. “Inclusion of Ionphase trSTAT can provide surface resistance values between e9
– e11 Ω
depending on the host polymer type and addition levels; therefore, although designed for anti-dust applications, Ionphase trSTAT is also suitable for EX or EPA applications,” it claims. Croda goes onto say that Ionphase trSTAT can also have a positive influence on the mechanical properties, maintaining them or slightly increasing them (Figure 3).
Electronic demand Increase in demand for electric and electronic components has been given an extra boost in recent years with the introduction of 5G and IoT (Internet of Things) technologies. “With it, the requirements for parts with both anti-dust and electrostatic dissipative properties is also increas- ing,” according to additives producer Adeka. “Permanent antistatic agents are already used for automotive parts, home appliance and packaging/ containers for electrical and electronic compo- nents, etc, and these markets are also growing.” Adeka has developed a new permanent
antistatic agent, ADKStab AS-302, to cover these applications. It can provide levels of antistatic performance from anti-dust to ESD through control of loading levels; it has a surface resistivity of 106 Ohms/sq. Typical loadings are 5-10wt% for anti-dust applications and 10-20wt% for ESD. The additive is supplied in pellet form and can, if
necessary, be added directly at the injection moulding machine. “The heat stability of ADK Stab AS-302 is
sufficient to be considered suitable for a whole range of engineering plastics processing tempera- tures,” the company says. “Furthermore, ADK Stab AS-302 has high recyclability. Our results show that antistatic performance of ABS with ADK Stab AS-302 does not change after multiple extrusion passes.” The additive is said to show good antistatic performance in styrenic resins and alloys, as well as polyesters, POM, PA and PP. Meanwhile, the company’s existing ADK Stab
AS-301E, already used as an anti-stat for polyole- fins, is finding new potential opportunities. “It was recently discovered that ADK Stab AS-301E can also be applied for PC film and sheet, which are used for packaging of electronic parts and compo- nents. It was found that it can provide good antistatic performance with much less impact on transparency of PC than alternative product offerings,” the company says.
Figure 4: Effect of ADK Stab AS-302 on surface resistivity of different compounds Source: Adeka
24 COMPOUNDING WORLD | February 2021
Conductive compounds Wittenburg Group company Witcom Engineering Plastics specialises in development and produc- tion of electrically conductive compounds based on a wide range of polymers. It says conductive POM (acetal) is gaining a lot of attention for semi-finished materials used during manufacturing and assembly of electronic components. “We can produce conductive POM that our customers can extrude safely up to more than 200 mm thick slabs and rod stocks without any stress cracking or gas bubbles on cross sections during further machining,” says Christine Van Bellingen,
www.compoundingworld.com
IMAGE: ADEKA
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