PVC | PLASTICISERS
Right: Emery Oleochemicals produces low-migration plasticisers that comply with legislation on substances for indirect food contact
tives such as cyclohexanoates and DOTP have an even greater need for fusing agents. Evonik’s answer to the problem is Elatur DPT di(iso)-pentyl terephthalate (Figure 4).
Among various advantages cited for this product is its very low content of volatiles and semi-volatiles (VOCs and SVOCs). “Most of the current fast fusers at least partly contain SVOCs, Becker said. “Elatur DPT is over 99% VOC and SVOC-free.” Elatur DPT also has very good cold storage properties, with no freezing down to –20°C. Elatur DPT is registered under REACH and
Evonik began producing it in commercial volumes in Q2 of this year. “Feedback from the market has been very positive,” says Becker. Lanxess says the trend towards non-phthalate solutions is “unbowed, especially in regulated markets. One alternative to phthalates is the alkylsulphonic acid ester Mesamoll.” This product has fast gelling properties in PVC and shows good plasticising efficiency, not only in PVC, but also in polyurethanes, acrylates and rubbers. Lanxess has also developed a range of new polymeric adipic acid esters – Ultramoll V and Ultramoll VII – with optimised processing behav- iour. This can be seen in a lower dissolution
Figure 5: Migration resistance of monomeric and polymeric plasticisers. Comparison of weight loss (%) after immersion in iso-octane for 4h at 60 °C Source: Emery Oleochemicals
temperature compared to Lanxess’ standard grades. The company says the new grades also have an improved compatibility with PVC, which is demonstrated by reduced exudation especially in humid environments. “Polymeric plasticisers from the Ultramoll range allow compliance with migration limits and the production of migration and extraction resistant goods,” the supplier says. “In addition to technical applications, Ultramoll VII has also been developed for use in sensitive applications such as articles intended to come into contact with food.” Ultramoll polymeric plasticisers differ in their average molecular chain lengths, which can be seen in their different viscosities, “to allow for diverse applica- tions and the focus on processing conditions or migration behaviour.” Lanxess says its acquisition of Chemtura in 2017 significantly broadened its portfolio of organic phosphoric acid esters. Depending on type, Disflamoll and Reofos speciality plasticisers have a high gelling capacity and plasticising action or give plasticised PVC (and elastomers) good low-temper- ature flexibility, it says. The classification of Disflamoll DPO, diphenyl 2-ethylhexyl phosphate, was recently reviewed, with the result that since the end of 2017
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EXTRAORDINARY TECHNOLOGIES FOR TODAY’S PLASTICS
PHOTO: EMERY OLEOCHEMICALS
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