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PVC plasticizers | additives feature


Green and fl exible: new developments in plasticizers


With the regulatory noose continuing to tighten around low-molecular-weight phthalate plasticizers, develop- ments in alternatives continue at a pace, with much effort being put into products derived from renewable resources.


“It is no surprise that low-molecular-weight


phthalate plasticizers classifi ed as substances of very high concern (SVHC) have declined dramatically in their market share, as a result of increasing pressure from regulating agencies”, says Wendy Herbst, marketing director for K-Flex plasticizers at Emerald Kalama Chemical, an important supplier of non-phthalates. She cites REACH from the European Union, AgBB from the German Institute for Structural Engineering, LEEDv4 from the US Green Building Council, and legal action surrounding California Proposition 65 as examples of the regulatory issues that are having an impact. Diethylhexyl phthalate, DEHP, is probably still the


most widely used PVC plasticizer in the world, but it continues to lose share globally. “Other higher molecu- lar-weight ortho-phthalates, such as DINP and DIDP also favoured as general purpose (GP) plasticizers, have had mixed outcomes in health assessments depending upon


www.compoundingworld.com


Peter Mapleston reviews the latest advances in PVC plasticizers, including bio-based additives and other alternatives to


low-molecular-weight phthalates


the agency; however the EU recently indicated that no hazard warnings under their classifi cation and labelling system were warranted,” Herbst notes. “Nonetheless, many formulators have turned to terephthalates such as DOTP as a replacement and non-phthalate alternative GP plasticizers such as 1,2-cyclohexane dicarboxylic acid dii- sononyl ester (DIDC).” “Consumer and regulatory pressures continue to


encourage brand owners and manufacturers of fl exible PVC products to move to non-phthalate solutions for their products,” says Martin Stimpson, market develop- ment manager of plasticizers with Eastman Chemical,


August 2015 | COMPOUNDING WORLD 21


Eastman’s 168 plasticizer is 40 years old, but


is still the basis for new grades and capacity expansions


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