ADDITIVES | POLYAMIDES
of action. It can achieve a UL 94 V-0 rating down to 0.4 mm thickness in polyamide compounds, which continue to exhibit good physical and electrical properties. Other benefits include low material density, good colourability and good contrast in laser marking. The company says OP 1400 is suitable for applications in hot and humid environ- ments and has good thermal stability; it says it also offers the broadest processing window within its Exolit OP product range for polyamides. In a presentation at AMI’s recent Performance
Above: Clariant’s Exolit OP 1400 flame retardant is finding applications in E&E and automotive
increase output of the extruders. Luvobatch PA HS 9611 and Luvobatch PA AO 0043 are heat stabilis- ers/antioxidants for PA claimed to significantly increase in-use temperature stability. Other new developments include Luvobatch PA AB 9986B, which is a slip/anti-block masterbatch for premium transparency and lowered coefficient of friction in BOPA, and Luvobatch PA FR 0014 and Luvobatch PA FR 0266, halogen-free flame retard- ant masterbatches based on PA6 and PA12 that can meet UL94 V-0 fire-retardancy in injection moulding and extrusion applications “Using these masterbatches in standard PA is a
cost-efficient alternative to using the expensive ready-to-use compounds offered by many polymer manufacturers,” says Bragvad. “Future develop- ments for polyamides will include UV masterbatch- es, as well as further slip additives.” Clariant developed Exolit OP 1400 to provide high thermal stability and halogen-free flame retardancy for polyamide parts used in EV and traditional vehicle applications. Based on organic phosphinates and suitable for use with reinforced PA6, PA66 and high temperature polyamides, OP 1400 achieves its flame retardant effect through a combined gas phase and condensed phase mode
Polyamides conference (AMI publishes Compound- ing World) Kathrin Lehmann, Head of Innovation Management Polymers, Interface and Performance at Evonik Nutrition & Care, highlighted the use of organomodified siloxanes to enhance performance and processability of flame retarded or highly-filled polyamide compounds. The potential benefits of using these additives include improved flow behaviour to provide better surface appearance, hydrophobicity giving better electrical properties (CTI), improved char formation resulting in lower burning time, and a compatibilising effect that improves mechanical properties such as elongation and impact strength.
Minerals and glass At the same conference, Michael Schmidt, TS&D Manager Polymers EMEA at Imerys Performance Additives, discussed the use of minerals in conjunction with chopped glass fibre in PA6 compounds to deliver improved properties and processability balance. He said that talc offers isotropic properties and is a nucleator, providing a good balance of stiffness and improving crystallisa- tion temperature, CLTE and flow. Mica offers the highest reinforcement, isotropic properties, CLTE and flow. Wollastonite can provide a good balance of stiffness/strength and impact, superior weld line strength, elongation, HDT and flow. In addition, Schmidt said hybrid formulations can close the
PHOTO: CLARIANT
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