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ADDITIVES | FLAME RETARDANTS


Right: Electron- ics is a target market for


Nofia polymeric FRs from FRX


compounding customers, PolyVisions, had intro- duced DuraPET FR, a graft-modified polyester compound containing Nofia, for demanding applications. FRX says DuraPET FR withstands temperatures from -40°C to more than 180°C and obtains a V-0 rating at 1.5 and 3.0mm. It is suitable for applications in automotive, transportation, medical equipment, construction, and electronics. “We believe DuraPET FR achieves a combination


of impact strength, chemical resistance and flame retardancy not available in any material at any price today,” says Scott B Howard, CEO of PolyVisions. FRX says DuraPET FR exhibits improved properties in addition to a level of flame retardancy not possible using non-polymeric, halogen-free FR solutions. Addressing the use of Nofia in PC and PC blends, Maggie Baumann, Market Development Consultant for FRX Polymers, says current commercial non-halo- genated flame retardant glass reinforced types only meet V-0 at a low thickness at the expense of reduced heat deflection temperature (HDT), especially when the glass fibre (GF) loading is high (40-50 wt%). What is often called for is a V-0 rating at 0.8mm or less at an HDT of 110°C or higher. “In addition, the flow of these highly filled GF PCs is very low, which is a limitation for injection moulding applications, especially for thin wall applications,” she says. “Polyphosphonate and poly(phosphonate- co-carbonate) provide GF PC with excellent flame retardancy with V-0 rating at thickness as low as 0.8mm while maintaining a high flow, high HDT, and very good mechanical properties.”


ATO substitution Nofia is also proving to be quite effective in replacing antimony trioxide (ATO) as a synergist in


flame retardant packages for polyesters and also polyamide 6 and 66, in part because it is much less dense (1.2 g/cm3


against 5.2 g/cm3 ) and also


because of recent price instability in ATO caused mostly by plant closures in China, the source of more than 80% of the world’s antimony. On top of that, antimony is a heavy metal and the ATO molecule is low in molecular weight and tends to migrate. “Compounders can make big savings by switching” Lebel says. FRX announced the availability of Nofia as a


Figure 1: Chart showing cost savings versus ATO price when using Nofia HM1100 polymeric flame retardant as an ATO replacement in a typical BFR system


34 COMPOUNDING WORLD | December 2017 Source: FRX Polymers


replacement for ATO in brominated flame retardant (BFR) systems in the summer. The company has already validated its effectiveness as an ATO replacement in glass-filled PA 66, PBT, PET and TPU. In typical FR system formulations, the end customer will start to experience a per part saving when using Nofia, rather than ATO, when ATO prices are higher than about $5.50/kg (see Figure 1). In 2017, ATO prices have been on the rise and have so far fluctuated between $7.50/kg up to $9.00/kg. Customers who have converted to Nofia are typically saving between 2.0 to 3.5 cents per part at the moment. Getting BFRs to deliver their maximum perfor- mance without the use of ATO as a synergist has been a tough nut to crack but the options are increasing and not just at FRX. At ICL, a major producer of BFRs (and other FR types), Product Stewardship Manager Lein Tange highlights new UL 94 V-0 polymeric brominated FR formulations that contain no ATO. He says brominated poly- acrylate FR-1025 and high molecular weight brominated epoxies F-2100 and F-2400 exhibit high voltage resistance, high CTI and GWIT and excellent mouldability in polyamide and thermo- plastic polyester compounds for connectors, relays and capacitors. “All formulations show significant density reductions and thus improved cost-efficien- cy compared to ATO-based ones,” he says. Meanwhile, Lanxess says that, through its


www.compoundingworld.com


PHOTO: FRX POLYMERS


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