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polyamides | Additives


Figure 4: The effect on Coeffi cient of Friction of Dow Corning’s 31-441 Additive versus rival materials in polyamide


separate proprietary technology that enables improved colour and reduced conductivity while maintaining high temperature stability, offering thermal stability of 1000 hours at 150°C.


Ginn also points to PolyAd Services’ line of products for recycled polyamide. “Recycled polyamide from carpet offers a unique set of challenges because of impurities which typically range from 5% to 15%,” she says. These impurities include polyolefi n contaminants, fi ller, dirt and other organic matter, which negatively affect the tensile strength and appearance of the plastic. Recycloblend 731 compatibilises and restabi- lises the resin, providing an aesthetic improvement and better than 20% tensile strength enhancement.


Patent protection Source: Dow Corning


Figure 5: Tensile strength retention of PolyAD stabilized PA6 compared to a non-stabilized alternative after oven ageing at 150˚C Source: PolyAd Services


thermal stability of up to 2,000 hours at 150°C in PA6 and up to 5,000 hours at 180°C in glass-fi lled PPA (Figure 5). She also highlights high dispersibility and high melt solubility, which allows the thermal stabilizers to process more easily through fi ne screenpacks. For products requiring high performance thermal


stability but minimised conductivity with lower copper content, Ginn says PolyAd Services has developed a


A number of polyamide producers and additive suppli- ers have developed technologies to increase the long-term resistance of polyamides in high temperature environments. At fi rst glance, these technologies appear to work in a very similar way, producing a skin that protects the mass of the part. Little surprise, then, that there has something of a patent war going on. Late last year, DSM announced that the European Patent Offi ce had overturned an earlier decision to revoke its patent covering its Diablo technology. EMS-Chemie is understood to have been among the challengers. DSM uses Diablo itself for its Stanyl and Akulon polyamides, and also licenses it to other material suppliers. “The long-term heat-ageing performance of materials made with Diablo differentiates it from competing materials currently on the market,” said DSM in a statement at the time. “It provides for stable mechanical performance of over 3,000 hours continuous use at temperatures higher than 200°C.”


Click on the links for more information:  www.dow.com/additiveswww.vertellus.comwww.nexamchemical.comwww.clariant.comwww.dowcorning.comwww.polyadservices.comwww.dsmep.com


Learn more at Performance Polyamides 2016


Performance Polyamides is a new international conference organised by Compounding World publisher AMI that will examine the latest advances in polyamide resins, compounds and additive technologies. Taking place in Cologne in Germany on 8-9 June 2016, the conference will cover developments in all types of polyamides - including PA6, 66, 46 and PPA – as well as exploring additives for enhancement of fl ame retardance, electrical properties, mechanical performance, thermal stability, frictional qualities, and processing. To fi nd out more about this event, which is sponsored by A Schulman, contact conference organiser Emily Renshaw. Tel: +44 (0)117 314 8111; Email: er@amiplastics.com Or download the brochure: http://bit.ly/PerfPA16


26 COMPOUNDING WORLD | February 2016 www.compoundingworld.com


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