products | Polymers and additives THERMAL CONDUCTIVITY POLYOLEFIN ADDITIVES
Tosaf adds four new antifog products
Mineral filler conducts the heat
Silatherm is a new thermally conductive mineral filler from HPF The Mineral Engineers, part of the Quarzwerke Group. The additive dissipates heat from plastics compounds without downgrading their electrical insulating properties. HPF has been working with the Leibniz-Institut für Polymerforschung in Dresden, Germany to carry out tests on polyamide 6 compounds incorporating the mineral. Thermal conductivities of up to 2.3 W/mK were achieved in the injection direction with a
THERMAL CONDUCTIVITY Compounds cool down LEDs
Lehman & Voss has devel- oped a range of thermally conductive polymer com- pounds for applications in LED lamps.
Based on PET and PA6, LSR ADDITIVES Fumed silica adds strength to transparent LSR
Cabot has launched Cab-O-Sil Clarus 3160 fumed silica, a new hydrophilic product for liquid silicone rubber (LSR) applications. This new fumed silica is designed to improve the performance of clear LSR compounds by providing a high level of reinforcement without sacrificing
64 COMPOUNDING WORLD | July 2014
transparency, and with minimal discolora- tion due to ageing. Target applications include consumer,
medical and lighting products. Cabot developed the additive to address regional demand in Asia-Pacific, specifically targeting compounders that prefer high
surface area fumed silica. Clarus 3160 has high structure and surface area, nominally 400 m2
/g compared to 300 m2 /g
for existing products typically used in this application. This leads to a 10% improve- ment in transmission, says Cabot. ❙
www.cabotcorp.com
www.compoundingworld.com
they provide thermal conduc- tivities from 0.6 to 1.5 W/mK. The grades are electrically insulating and possess tensile strength up to 55 MPa and impact strength to 29 kJ/m2
.
They also offer UL94 V-0 flame resistance, and provide good processing characteris- tics for complex geometries and thin wall sections. ❙
www.luvocom.com
Silatherm loading of 75% by weight. In the transverse direction, the values were at least 0.9 W/mK with a 65% loading (the thermal conductiv- ity of unfilled PA is 0.3 W/mK). According to HPF, the
mechanical properties of the compounds remain at “a very good level for these high filler proportions”. The company also says that the price level is “attractive” and opens up commercial opportunities in applications such as heat sinks, electronic enclosures and sensors.
The efficiency of Silatherm
is illustrated in the photograph – shortly after areas 3 and 4 were touched simultaneously, the Silatherm containing area 4 shows a much lower residual heat due to its improved thermal conductivity. ❙
www.hpfminerals.com l Dr Jörg Ulrich Zilles, head of R&D at HPF, will discuss these developments in more detail as part of the conduc- tive compounds session at the Compounding World Forum 2014. More details at
http://bit.ly/CWF14B.
Tosaf has expanded its range of antifog masterbatches for packaging films and sheets. Four new grades – all approved for food contact – have been created for various polyolefins.
AF4953LL is designed for
multi-layer barrier packaging applications, including films with a high amount of metallocene LLDPE. It provides very good immedi- ate as well as prolonged antifog activity. The second grade, AF5979PE was developed for high clarity barrier films, providing superior optical properties. Specially tailored for PP barrier films, AF2327PP is claimed to deliver outstand- ing processability and excellent activity even after lamination. Completing the line-up is AF6851LL, which is an efficient antifog solution for sealing layers containing polybutene. ❙
www.tosaf.com
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