materials feature | Additives for polyolefins
different polymeric materials, stating that a 40% loading of talc reduces the co2
impact of pp by up to 35%
compared to pure resin. in addition, further savings can be achieved because the reinforcing effect of talc allows parts to be downgauged while maintaining the same rigidity. For example, crépin-leblond showed that a 3 mm
thick pp part could be reduced to 2.12 mm thick using a loading of just 26% talc. This more than offsets the increase in density, giving an overall weight saving of 14%. And because of the reduced carbon footprint of talc compared to pp, the overall co2
equivalent
emissions are reduced by 35%. imerys Talc also presented its ultrafine talc grades
which have a medium particles size down to 1 micron and a precise topcut for impact strength. Jetfine 3cA has been developed for reinforcement applications, delivering a better stiffness/impact balance, higher dimensional stability and improved scratch resistance. Target applications include high-impact Tpos for automotive parts, plus blow-moulded HdpE packaging products where a 10% loading delivers 10% weight savings, a 10% reduction in permeability and 40% less shrinkage. The company is now developing Jetfine T1cA as a
Target applications for Thor’s Aflam- mit flame retardants include films used in the construction industry
or higher Fr performance than halogenated products in thin-wall articles, as well preserving the transparency of the film and delivering better mechanical properties. it can be used in compound or masterbatch applica- tions, opening up new opportunities for halogen-free films and tapes. Jérôme gocyk of Polimeri Europa presented a
combination of its clearflex VldpE and greenflex EVA as a balanced material for HFFr (halogen free flame retardant) cable compounds based on high loadings of aluminium hydroxide (ATH) or magnesium hydroxide (mdH). The VldpE provides lower density, thermal stability, higher melting point, better mechanical properties and higher hot tack. At the same time, EVA delivers good processability, flexibility, different shrinkage, high clarity and polar properties. gocyk said that the combination of EVA and VldpE is the best option to pass the hot pressure test.
Filled for sustainability The two presentations on developments in functional fillers and reinforcements focused on sustainability. Jérôme crépin-leblond represented Imerys Talc, which was formed following the recent acquisition of rio Tinto’s luzenac business by imerys. He discussed how talc can be used to reduced the carbon footprint of
24 compounding world | January 2012
locally-sourced ultrafine grade for Europe, the middle East and Africa. The target is to achieve similar performance as Jetfine 3cA by selecting highly lamellar, medium white ore and using a unique milling technology. it is already being used in automotive applications, delivering improved impact strength even at very low temperatures. crépin-leblond also presented imerys Talc’s High
Aspect ratio (HAr) grades including the new genera- tion grade HAr ng which delivers similar reinforcement benefits as the existing HAr T84 product, but improves the charpy impact performance by 25%. The falling weight energy absorption at -20o
RockTron is another supplier of fillers that is
focusing on sustainability. Andreas Eggert explained that the company is recycling fillers from fly ash, a waste product from coal-fired power stations that is both inexpensive and abundant. it has introduced a dedicated beneficiation plant that separates the fly ash into its constituent components such as magnetite, which is marketed as magTron, and solid alumino- silicate glass spheres which are sold as minTron as an alternative to traditional fillers and glass beads. The spherical shape of minTron offers advantages in
dispersion compared to irregularly-shaped fillers. in addition, the hardness of the glass spheres (5-6 on the mohs scale) gives high scratch resistance. Examples were shown of scratch test plaques where a pp co-
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c is more than doubled.
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