ADDITIVES | ANTIOXIDANTS/UV STABILISERS
Right: The EU’s REACH registration deadline next year on chemicals manufactured in volumes from 1-100 tpa could see products withdrawn
requirements and regulations. These include the Ultranox 800 series of formulated phosphite AO blends for use by polypropylene compounders and recyclers. There are currently three grades in this series – 813, 815 and 817. “They have been designed for applications that demand high temperature storage stability, extreme process stability, or enhanced colour stability,” the company says. The new products are intended as alternatives to B225 and B215 types. Compared with existing AO options, Addivant says Ultranox 800 products provide 20% better melt flow retention and cut discoloration by half. Foster points out that the Ultranox 800 series
provide some key benefits in recycling applica- tions. He says they make it possible to increase the amount of regrind that can be mixed back into virgin material by a factor of three, without any effect on performance or colour. Alternatively, processors can cut cost by keeping regrind levels the same but use as much as 60% less AO. Addivant says it is also working on a new
platform for low-VOC PVC stabilisers that should be available around the beginning of Q4.
Below: Food packaging is a major market for Addivant’s Weston 705
Food developments In the food contact area Addivant’s flagship AO remains Weston 705, its nonylphenol-free liquid phosphite aimed squarely (but not exclusively) at LLDPE. In March this year, Addivant said that Weston 705 had been approved globally by more than 20 major polymer manufacturers. Weston 705 is approved for use in certain food-contact applications in more than 180 countries. In May, the European Food Standards Agency (EFSA) doubled the Specific Migration Limit (SML) to 10mg/kg, expanding the AO’s approval to an even broader range of food-contact applications. “This makes Weston 705 the perfect
stabilisation solution for the most demanding food packaging applications such as fatty food or alcohol content packaging,” the company said at the time. Earlier, in April, the US Food and Drug Administration (FDA) had provided formal approv- al for its use in infant formula and human milk plastic packaging. This covers use at levels up to 2,000 ppm in multiple types of polymers. In June this year, Addivant marked a tripling of
its production capacity for Weston 705 at its plant at Morgantown in West Virginia in the US. By the end of this year, it will have expanded capacity for the AO five-fold compared to its early 2016 capacities in the US and China and the company anticipates an additional expansion in 2018. Foster says the potential market at maturity is in the range of hundreds of millions of dollars. Remaining in the food sector, Dover Chemical
Corporation has received expanded-use FDA clearance for its Doverphos LGP-11 AO as a thermal stabiliser at loading levels up to 2,000 ppm in PP and HIPS used as components of finished food packaging and repeated-use articles in contact with all types of food under Conditions of Use A through H. This expanded food contact clearance is in addition to the existing clearance for Doverphos LGP-11 in single and repeated-use LLDPE films and HDPE articles in the same conditions.
TNPP alternative Doverphos LGP-11 is a polymeric liquid, high molecular weight phosphite that Dover says is suitable as an alternative to TNPP, or any other phosphite additive, in any polyolefin application. It can also be used in other resin systems such as SBS, SBR, urethanes and PVC. “Doverphos LGP-11 is unique in that it contains no alkylphenol compo- nents, has superior colour hold, has low migration, and is composed of biodegradable raw materials,” the supplier says.
40 COMPOUNDING WORLD | September 2017
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PHOTO: ADDIVANT
PHOTO: SHUTTERSTOCK
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